diff options
Diffstat (limited to 'src/third-party/md4c')
| -rw-r--r-- | src/third-party/md4c/md4c.c | 6410 | ||||
| -rw-r--r-- | src/third-party/md4c/md4c.h | 405 |
2 files changed, 6815 insertions, 0 deletions
diff --git a/src/third-party/md4c/md4c.c b/src/third-party/md4c/md4c.c new file mode 100644 index 0000000..3677c0e --- /dev/null +++ b/src/third-party/md4c/md4c.c @@ -0,0 +1,6410 @@ +/* + * MD4C: Markdown parser for C + * (http://github.com/mity/md4c) + * + * Copyright (c) 2016-2020 Martin Mitas + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS + * IN THE SOFTWARE. + */ + +#include "md4c.h" + +#include <limits.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + + +/***************************** + *** Miscellaneous Stuff *** + *****************************/ + +#if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199409L + /* C89/90 or old compilers in general may not understand "inline". */ + #if defined __GNUC__ + #define inline __inline__ + #elif defined _MSC_VER + #define inline __inline + #else + #define inline + #endif +#endif + +/* Make the UTF-8 support the default. */ +#if !defined MD4C_USE_ASCII && !defined MD4C_USE_UTF8 && !defined MD4C_USE_UTF16 + #define MD4C_USE_UTF8 +#endif + +/* Magic for making wide literals with MD4C_USE_UTF16. */ +#ifdef _T + #undef _T +#endif +#if defined MD4C_USE_UTF16 + #define _T(x) L##x +#else + #define _T(x) x +#endif + +/* Misc. macros. */ +#define SIZEOF_ARRAY(a) (sizeof(a) / sizeof(a[0])) + +#define STRINGIZE_(x) #x +#define STRINGIZE(x) STRINGIZE_(x) + +#ifndef TRUE + #define TRUE 1 + #define FALSE 0 +#endif + +#define MD_LOG(msg) \ + do { \ + if(ctx->parser.debug_log != NULL) \ + ctx->parser.debug_log((msg), ctx->userdata); \ + } while(0) + +#ifdef DEBUG + #define MD_ASSERT(cond) \ + do { \ + if(!(cond)) { \ + MD_LOG(__FILE__ ":" STRINGIZE(__LINE__) ": " \ + "Assertion '" STRINGIZE(cond) "' failed."); \ + exit(1); \ + } \ + } while(0) + + #define MD_UNREACHABLE() MD_ASSERT(1 == 0) +#else + #ifdef __GNUC__ + #define MD_ASSERT(cond) do { if(!(cond)) __builtin_unreachable(); } while(0) + #define MD_UNREACHABLE() do { __builtin_unreachable(); } while(0) + #elif defined _MSC_VER && _MSC_VER > 120 + #define MD_ASSERT(cond) do { __assume(cond); } while(0) + #define MD_UNREACHABLE() do { __assume(0); } while(0) + #else + #define MD_ASSERT(cond) do {} while(0) + #define MD_UNREACHABLE() do {} while(0) + #endif +#endif + +/* For falling through case labels in switch statements. */ +#if defined __clang__ && __clang_major__ >= 12 + #define MD_FALLTHROUGH() __attribute__((fallthrough)) +#elif defined __GNUC__ && __GNUC__ >= 7 + #define MD_FALLTHROUGH() __attribute__((fallthrough)) +#else + #define MD_FALLTHROUGH() ((void)0) +#endif + +/* Suppress "unused parameter" warnings. */ +#define MD_UNUSED(x) ((void)x) + + +/************************ + *** Internal Types *** + ************************/ + +/* These are omnipresent so lets save some typing. */ +#define CHAR MD_CHAR +#define SZ MD_SIZE +#define OFF MD_OFFSET + +typedef struct MD_MARK_tag MD_MARK; +typedef struct MD_BLOCK_tag MD_BLOCK; +typedef struct MD_CONTAINER_tag MD_CONTAINER; +typedef struct MD_REF_DEF_tag MD_REF_DEF; + + +/* During analyzes of inline marks, we need to manage some "mark chains", + * of (yet unresolved) openers. This structure holds start/end of the chain. + * The chain internals are then realized through MD_MARK::prev and ::next. + */ +typedef struct MD_MARKCHAIN_tag MD_MARKCHAIN; +struct MD_MARKCHAIN_tag { + int head; /* Index of first mark in the chain, or -1 if empty. */ + int tail; /* Index of last mark in the chain, or -1 if empty. */ +}; + +/* Context propagated through all the parsing. */ +typedef struct MD_CTX_tag MD_CTX; +struct MD_CTX_tag { + /* Immutable stuff (parameters of md_parse()). */ + const CHAR* text; + SZ size; + MD_PARSER parser; + void* userdata; + + /* When this is true, it allows some optimizations. */ + int doc_ends_with_newline; + + /* Helper temporary growing buffer. */ + CHAR* buffer; + unsigned alloc_buffer; + + /* Reference definitions. */ + MD_REF_DEF* ref_defs; + int n_ref_defs; + int alloc_ref_defs; + void** ref_def_hashtable; + int ref_def_hashtable_size; + + /* Stack of inline/span markers. + * This is only used for parsing a single block contents but by storing it + * here we may reuse the stack for subsequent blocks; i.e. we have fewer + * (re)allocations. */ + MD_MARK* marks; + int n_marks; + int alloc_marks; + +#if defined MD4C_USE_UTF16 + char mark_char_map[128]; +#else + char mark_char_map[256]; +#endif + + /* For resolving of inline spans. */ + MD_MARKCHAIN mark_chains[13]; +#define PTR_CHAIN (ctx->mark_chains[0]) +#define TABLECELLBOUNDARIES (ctx->mark_chains[1]) +#define ASTERISK_OPENERS_extraword_mod3_0 (ctx->mark_chains[2]) +#define ASTERISK_OPENERS_extraword_mod3_1 (ctx->mark_chains[3]) +#define ASTERISK_OPENERS_extraword_mod3_2 (ctx->mark_chains[4]) +#define ASTERISK_OPENERS_intraword_mod3_0 (ctx->mark_chains[5]) +#define ASTERISK_OPENERS_intraword_mod3_1 (ctx->mark_chains[6]) +#define ASTERISK_OPENERS_intraword_mod3_2 (ctx->mark_chains[7]) +#define UNDERSCORE_OPENERS (ctx->mark_chains[8]) +#define TILDE_OPENERS_1 (ctx->mark_chains[9]) +#define TILDE_OPENERS_2 (ctx->mark_chains[10]) +#define BRACKET_OPENERS (ctx->mark_chains[11]) +#define DOLLAR_OPENERS (ctx->mark_chains[12]) +#define OPENERS_CHAIN_FIRST 1 +#define OPENERS_CHAIN_LAST 12 + + int n_table_cell_boundaries; + + /* For resolving links. */ + int unresolved_link_head; + int unresolved_link_tail; + + /* For resolving raw HTML. */ + OFF html_comment_horizon; + OFF html_proc_instr_horizon; + OFF html_decl_horizon; + OFF html_cdata_horizon; + + /* For block analysis. + * Notes: + * -- It holds MD_BLOCK as well as MD_LINE structures. After each + * MD_BLOCK, its (multiple) MD_LINE(s) follow. + * -- For MD_BLOCK_HTML and MD_BLOCK_CODE, MD_VERBATIMLINE(s) are used + * instead of MD_LINE(s). + */ + void* block_bytes; + MD_BLOCK* current_block; + int n_block_bytes; + int alloc_block_bytes; + + /* For container block analysis. */ + MD_CONTAINER* containers; + int n_containers; + int alloc_containers; + + /* Minimal indentation to call the block "indented code block". */ + unsigned code_indent_offset; + + /* Contextual info for line analysis. */ + SZ code_fence_length; /* For checking closing fence length. */ + int html_block_type; /* For checking closing raw HTML condition. */ + int last_line_has_list_loosening_effect; + int last_list_item_starts_with_two_blank_lines; +}; + +enum MD_LINETYPE_tag { + MD_LINE_BLANK, + MD_LINE_HR, + MD_LINE_ATXHEADER, + MD_LINE_SETEXTHEADER, + MD_LINE_SETEXTUNDERLINE, + MD_LINE_INDENTEDCODE, + MD_LINE_FENCEDCODE, + MD_LINE_HTML, + MD_LINE_TEXT, + MD_LINE_TABLE, + MD_LINE_TABLEUNDERLINE +}; +typedef enum MD_LINETYPE_tag MD_LINETYPE; + +typedef struct MD_LINE_ANALYSIS_tag MD_LINE_ANALYSIS; +struct MD_LINE_ANALYSIS_tag { + MD_LINETYPE type : 16; + unsigned data : 16; + OFF beg; + OFF end; + unsigned indent; /* Indentation level. */ +}; + +typedef struct MD_LINE_tag MD_LINE; +struct MD_LINE_tag { + OFF beg; + OFF end; +}; + +typedef struct MD_VERBATIMLINE_tag MD_VERBATIMLINE; +struct MD_VERBATIMLINE_tag { + OFF beg; + OFF end; + OFF indent; +}; + + +/***************** + *** Helpers *** + *****************/ + +/* Character accessors. */ +#define CH(off) (ctx->text[(off)]) +#define STR(off) (ctx->text + (off)) + +/* Character classification. + * Note we assume ASCII compatibility of code points < 128 here. */ +#define ISIN_(ch, ch_min, ch_max) ((ch_min) <= (unsigned)(ch) && (unsigned)(ch) <= (ch_max)) +#define ISANYOF_(ch, palette) ((ch) != _T('\0') && md_strchr((palette), (ch)) != NULL) +#define ISANYOF2_(ch, ch1, ch2) ((ch) == (ch1) || (ch) == (ch2)) +#define ISANYOF3_(ch, ch1, ch2, ch3) ((ch) == (ch1) || (ch) == (ch2) || (ch) == (ch3)) +#define ISASCII_(ch) ((unsigned)(ch) <= 127) +#define ISBLANK_(ch) (ISANYOF2_((ch), _T(' '), _T('\t'))) +#define ISNEWLINE_(ch) (ISANYOF2_((ch), _T('\r'), _T('\n'))) +#define ISWHITESPACE_(ch) (ISBLANK_(ch) || ISANYOF2_((ch), _T('\v'), _T('\f'))) +#define ISCNTRL_(ch) ((unsigned)(ch) <= 31 || (unsigned)(ch) == 127) +#define ISPUNCT_(ch) (ISIN_(ch, 33, 47) || ISIN_(ch, 58, 64) || ISIN_(ch, 91, 96) || ISIN_(ch, 123, 126)) +#define ISUPPER_(ch) (ISIN_(ch, _T('A'), _T('Z'))) +#define ISLOWER_(ch) (ISIN_(ch, _T('a'), _T('z'))) +#define ISALPHA_(ch) (ISUPPER_(ch) || ISLOWER_(ch)) +#define ISDIGIT_(ch) (ISIN_(ch, _T('0'), _T('9'))) +#define ISXDIGIT_(ch) (ISDIGIT_(ch) || ISIN_(ch, _T('A'), _T('F')) || ISIN_(ch, _T('a'), _T('f'))) +#define ISALNUM_(ch) (ISALPHA_(ch) || ISDIGIT_(ch)) + +#define ISANYOF(off, palette) ISANYOF_(CH(off), (palette)) +#define ISANYOF2(off, ch1, ch2) ISANYOF2_(CH(off), (ch1), (ch2)) +#define ISANYOF3(off, ch1, ch2, ch3) ISANYOF3_(CH(off), (ch1), (ch2), (ch3)) +#define ISASCII(off) ISASCII_(CH(off)) +#define ISBLANK(off) ISBLANK_(CH(off)) +#define ISNEWLINE(off) ISNEWLINE_(CH(off)) +#define ISWHITESPACE(off) ISWHITESPACE_(CH(off)) +#define ISCNTRL(off) ISCNTRL_(CH(off)) +#define ISPUNCT(off) ISPUNCT_(CH(off)) +#define ISUPPER(off) ISUPPER_(CH(off)) +#define ISLOWER(off) ISLOWER_(CH(off)) +#define ISALPHA(off) ISALPHA_(CH(off)) +#define ISDIGIT(off) ISDIGIT_(CH(off)) +#define ISXDIGIT(off) ISXDIGIT_(CH(off)) +#define ISALNUM(off) ISALNUM_(CH(off)) + + +#if defined MD4C_USE_UTF16 + #define md_strchr wcschr +#else + #define md_strchr strchr +#endif + + +/* Case insensitive check of string equality. */ +static inline int +md_ascii_case_eq(const CHAR* s1, const CHAR* s2, SZ n) +{ + OFF i; + for(i = 0; i < n; i++) { + CHAR ch1 = s1[i]; + CHAR ch2 = s2[i]; + + if(ISLOWER_(ch1)) + ch1 += ('A'-'a'); + if(ISLOWER_(ch2)) + ch2 += ('A'-'a'); + if(ch1 != ch2) + return FALSE; + } + return TRUE; +} + +static inline int +md_ascii_eq(const CHAR* s1, const CHAR* s2, SZ n) +{ + return memcmp(s1, s2, n * sizeof(CHAR)) == 0; +} + +static int +md_text_with_null_replacement(MD_CTX* ctx, MD_TEXTTYPE type, const CHAR* str, SZ size) +{ + OFF off = 0; + int ret = 0; + + while(1) { + while(off < size && str[off] != _T('\0')) + off++; + + if(off > 0) { + ret = ctx->parser.text(type, str, off, ctx->userdata); + if(ret != 0) + return ret; + + str += off; + size -= off; + off = 0; + } + + if(off >= size) + return 0; + + ret = ctx->parser.text(MD_TEXT_NULLCHAR, _T(""), 1, ctx->userdata); + if(ret != 0) + return ret; + off++; + } +} + + +#define MD_CHECK(func) \ + do { \ + ret = (func); \ + if(ret < 0) \ + goto abort; \ + } while(0) + + +#define MD_TEMP_BUFFER(sz) \ + do { \ + if(sz > ctx->alloc_buffer) { \ + CHAR* new_buffer; \ + SZ new_size = ((sz) + (sz) / 2 + 128) & ~127; \ + \ + new_buffer = realloc(ctx->buffer, new_size); \ + if(new_buffer == NULL) { \ + MD_LOG("realloc() failed."); \ + ret = -1; \ + goto abort; \ + } \ + \ + ctx->buffer = new_buffer; \ + ctx->alloc_buffer = new_size; \ + } \ + } while(0) + + +#define MD_ENTER_BLOCK(type, arg) \ + do { \ + ret = ctx->parser.enter_block((type), (arg), ctx->userdata); \ + if(ret != 0) { \ + MD_LOG("Aborted from enter_block() callback."); \ + goto abort; \ + } \ + } while(0) + +#define MD_LEAVE_BLOCK(type, arg) \ + do { \ + ret = ctx->parser.leave_block((type), (arg), ctx->userdata); \ + if(ret != 0) { \ + MD_LOG("Aborted from leave_block() callback."); \ + goto abort; \ + } \ + } while(0) + +#define MD_ENTER_SPAN(type, arg) \ + do { \ + ret = ctx->parser.enter_span((type), (arg), ctx->userdata); \ + if(ret != 0) { \ + MD_LOG("Aborted from enter_span() callback."); \ + goto abort; \ + } \ + } while(0) + +#define MD_LEAVE_SPAN(type, arg) \ + do { \ + ret = ctx->parser.leave_span((type), (arg), ctx->userdata); \ + if(ret != 0) { \ + MD_LOG("Aborted from leave_span() callback."); \ + goto abort; \ + } \ + } while(0) + +#define MD_TEXT(type, str, size) \ + do { \ + if(size > 0) { \ + ret = ctx->parser.text((type), (str), (size), ctx->userdata); \ + if(ret != 0) { \ + MD_LOG("Aborted from text() callback."); \ + goto abort; \ + } \ + } \ + } while(0) + +#define MD_TEXT_INSECURE(type, str, size) \ + do { \ + if(size > 0) { \ + ret = md_text_with_null_replacement(ctx, type, str, size); \ + if(ret != 0) { \ + MD_LOG("Aborted from text() callback."); \ + goto abort; \ + } \ + } \ + } while(0) + + +/* If the offset falls into a gap between line, we return the following + * line. */ +static const MD_LINE* +md_lookup_line(OFF off, const MD_LINE* lines, int n_lines) +{ + int lo, hi; + int pivot; + const MD_LINE* line; + + lo = 0; + hi = n_lines - 1; + while(lo <= hi) { + pivot = (lo + hi) / 2; + line = &lines[pivot]; + + if(off < line->beg) { + hi = pivot - 1; + if(hi < 0 || lines[hi].end <= off) + return line; + } else if(off > line->end) { + lo = pivot + 1; + } else { + return line; + } + } + + return NULL; +} + + +/************************* + *** Unicode Support *** + *************************/ + +typedef struct MD_UNICODE_FOLD_INFO_tag MD_UNICODE_FOLD_INFO; +struct MD_UNICODE_FOLD_INFO_tag { + unsigned codepoints[3]; + unsigned n_codepoints; +}; + + +#if defined MD4C_USE_UTF16 || defined MD4C_USE_UTF8 + /* Binary search over sorted "map" of codepoints. Consecutive sequences + * of codepoints may be encoded in the map by just using the + * (MIN_CODEPOINT | 0x40000000) and (MAX_CODEPOINT | 0x80000000). + * + * Returns index of the found record in the map (in the case of ranges, + * the minimal value is used); or -1 on failure. */ + static int + md_unicode_bsearch__(unsigned codepoint, const unsigned* map, size_t map_size) + { + int beg, end; + int pivot_beg, pivot_end; + + beg = 0; + end = (int) map_size-1; + while(beg <= end) { + /* Pivot may be a range, not just a single value. */ + pivot_beg = pivot_end = (beg + end) / 2; + if(map[pivot_end] & 0x40000000) + pivot_end++; + if(map[pivot_beg] & 0x80000000) + pivot_beg--; + + if(codepoint < (map[pivot_beg] & 0x00ffffff)) + end = pivot_beg - 1; + else if(codepoint > (map[pivot_end] & 0x00ffffff)) + beg = pivot_end + 1; + else + return pivot_beg; + } + + return -1; + } + + static int + md_is_unicode_whitespace__(unsigned codepoint) + { +#define R(cp_min, cp_max) ((cp_min) | 0x40000000), ((cp_max) | 0x80000000) +#define S(cp) (cp) + /* Unicode "Zs" category. + * (generated by scripts/build_whitespace_map.py) */ + static const unsigned WHITESPACE_MAP[] = { + S(0x0020), S(0x00a0), S(0x1680), R(0x2000,0x200a), S(0x202f), S(0x205f), S(0x3000) + }; +#undef R +#undef S + + /* The ASCII ones are the most frequently used ones, also CommonMark + * specification requests few more in this range. */ + if(codepoint <= 0x7f) + return ISWHITESPACE_(codepoint); + + return (md_unicode_bsearch__(codepoint, WHITESPACE_MAP, SIZEOF_ARRAY(WHITESPACE_MAP)) >= 0); + } + + static int + md_is_unicode_punct__(unsigned codepoint) + { +#define R(cp_min, cp_max) ((cp_min) | 0x40000000), ((cp_max) | 0x80000000) +#define S(cp) (cp) + /* Unicode "Pc", "Pd", "Pe", "Pf", "Pi", "Po", "Ps" categories. + * (generated by scripts/build_punct_map.py) */ + static const unsigned PUNCT_MAP[] = { + R(0x0021,0x0023), R(0x0025,0x002a), R(0x002c,0x002f), R(0x003a,0x003b), R(0x003f,0x0040), + R(0x005b,0x005d), S(0x005f), S(0x007b), S(0x007d), S(0x00a1), S(0x00a7), S(0x00ab), R(0x00b6,0x00b7), + S(0x00bb), S(0x00bf), S(0x037e), S(0x0387), R(0x055a,0x055f), R(0x0589,0x058a), S(0x05be), S(0x05c0), + S(0x05c3), S(0x05c6), R(0x05f3,0x05f4), R(0x0609,0x060a), R(0x060c,0x060d), S(0x061b), R(0x061e,0x061f), + R(0x066a,0x066d), S(0x06d4), R(0x0700,0x070d), R(0x07f7,0x07f9), R(0x0830,0x083e), S(0x085e), + R(0x0964,0x0965), S(0x0970), S(0x09fd), S(0x0a76), S(0x0af0), S(0x0c77), S(0x0c84), S(0x0df4), S(0x0e4f), + R(0x0e5a,0x0e5b), R(0x0f04,0x0f12), S(0x0f14), R(0x0f3a,0x0f3d), S(0x0f85), R(0x0fd0,0x0fd4), + R(0x0fd9,0x0fda), R(0x104a,0x104f), S(0x10fb), R(0x1360,0x1368), S(0x1400), S(0x166e), R(0x169b,0x169c), + R(0x16eb,0x16ed), R(0x1735,0x1736), R(0x17d4,0x17d6), R(0x17d8,0x17da), R(0x1800,0x180a), + R(0x1944,0x1945), R(0x1a1e,0x1a1f), R(0x1aa0,0x1aa6), R(0x1aa8,0x1aad), R(0x1b5a,0x1b60), + R(0x1bfc,0x1bff), R(0x1c3b,0x1c3f), R(0x1c7e,0x1c7f), R(0x1cc0,0x1cc7), S(0x1cd3), R(0x2010,0x2027), + R(0x2030,0x2043), R(0x2045,0x2051), R(0x2053,0x205e), R(0x207d,0x207e), R(0x208d,0x208e), + R(0x2308,0x230b), R(0x2329,0x232a), R(0x2768,0x2775), R(0x27c5,0x27c6), R(0x27e6,0x27ef), + R(0x2983,0x2998), R(0x29d8,0x29db), R(0x29fc,0x29fd), R(0x2cf9,0x2cfc), R(0x2cfe,0x2cff), S(0x2d70), + R(0x2e00,0x2e2e), R(0x2e30,0x2e4f), S(0x2e52), R(0x3001,0x3003), R(0x3008,0x3011), R(0x3014,0x301f), + S(0x3030), S(0x303d), S(0x30a0), S(0x30fb), R(0xa4fe,0xa4ff), R(0xa60d,0xa60f), S(0xa673), S(0xa67e), + R(0xa6f2,0xa6f7), R(0xa874,0xa877), R(0xa8ce,0xa8cf), R(0xa8f8,0xa8fa), S(0xa8fc), R(0xa92e,0xa92f), + S(0xa95f), R(0xa9c1,0xa9cd), R(0xa9de,0xa9df), R(0xaa5c,0xaa5f), R(0xaade,0xaadf), R(0xaaf0,0xaaf1), + S(0xabeb), R(0xfd3e,0xfd3f), R(0xfe10,0xfe19), R(0xfe30,0xfe52), R(0xfe54,0xfe61), S(0xfe63), S(0xfe68), + R(0xfe6a,0xfe6b), R(0xff01,0xff03), R(0xff05,0xff0a), R(0xff0c,0xff0f), R(0xff1a,0xff1b), + R(0xff1f,0xff20), R(0xff3b,0xff3d), S(0xff3f), S(0xff5b), S(0xff5d), R(0xff5f,0xff65), R(0x10100,0x10102), + S(0x1039f), S(0x103d0), S(0x1056f), S(0x10857), S(0x1091f), S(0x1093f), R(0x10a50,0x10a58), S(0x10a7f), + R(0x10af0,0x10af6), R(0x10b39,0x10b3f), R(0x10b99,0x10b9c), S(0x10ead), R(0x10f55,0x10f59), + R(0x11047,0x1104d), R(0x110bb,0x110bc), R(0x110be,0x110c1), R(0x11140,0x11143), R(0x11174,0x11175), + R(0x111c5,0x111c8), S(0x111cd), S(0x111db), R(0x111dd,0x111df), R(0x11238,0x1123d), S(0x112a9), + R(0x1144b,0x1144f), R(0x1145a,0x1145b), S(0x1145d), S(0x114c6), R(0x115c1,0x115d7), R(0x11641,0x11643), + R(0x11660,0x1166c), R(0x1173c,0x1173e), S(0x1183b), R(0x11944,0x11946), S(0x119e2), R(0x11a3f,0x11a46), + R(0x11a9a,0x11a9c), R(0x11a9e,0x11aa2), R(0x11c41,0x11c45), R(0x11c70,0x11c71), R(0x11ef7,0x11ef8), + S(0x11fff), R(0x12470,0x12474), R(0x16a6e,0x16a6f), S(0x16af5), R(0x16b37,0x16b3b), S(0x16b44), + R(0x16e97,0x16e9a), S(0x16fe2), S(0x1bc9f), R(0x1da87,0x1da8b), R(0x1e95e,0x1e95f) + }; +#undef R +#undef S + + /* The ASCII ones are the most frequently used ones, also CommonMark + * specification requests few more in this range. */ + if(codepoint <= 0x7f) + return ISPUNCT_(codepoint); + + return (md_unicode_bsearch__(codepoint, PUNCT_MAP, SIZEOF_ARRAY(PUNCT_MAP)) >= 0); + } + + static void + md_get_unicode_fold_info(unsigned codepoint, MD_UNICODE_FOLD_INFO* info) + { +#define R(cp_min, cp_max) ((cp_min) | 0x40000000), ((cp_max) | 0x80000000) +#define S(cp) (cp) + /* Unicode "Pc", "Pd", "Pe", "Pf", "Pi", "Po", "Ps" categories. + * (generated by scripts/build_folding_map.py) */ + static const unsigned FOLD_MAP_1[] = { + R(0x0041,0x005a), S(0x00b5), R(0x00c0,0x00d6), R(0x00d8,0x00de), R(0x0100,0x012e), R(0x0132,0x0136), + R(0x0139,0x0147), R(0x014a,0x0176), S(0x0178), R(0x0179,0x017d), S(0x017f), S(0x0181), S(0x0182), + S(0x0184), S(0x0186), S(0x0187), S(0x0189), S(0x018a), S(0x018b), S(0x018e), S(0x018f), S(0x0190), + S(0x0191), S(0x0193), S(0x0194), S(0x0196), S(0x0197), S(0x0198), S(0x019c), S(0x019d), S(0x019f), + R(0x01a0,0x01a4), S(0x01a6), S(0x01a7), S(0x01a9), S(0x01ac), S(0x01ae), S(0x01af), S(0x01b1), S(0x01b2), + S(0x01b3), S(0x01b5), S(0x01b7), S(0x01b8), S(0x01bc), S(0x01c4), S(0x01c5), S(0x01c7), S(0x01c8), + S(0x01ca), R(0x01cb,0x01db), R(0x01de,0x01ee), S(0x01f1), S(0x01f2), S(0x01f4), S(0x01f6), S(0x01f7), + R(0x01f8,0x021e), S(0x0220), R(0x0222,0x0232), S(0x023a), S(0x023b), S(0x023d), S(0x023e), S(0x0241), + S(0x0243), S(0x0244), S(0x0245), R(0x0246,0x024e), S(0x0345), S(0x0370), S(0x0372), S(0x0376), S(0x037f), + S(0x0386), R(0x0388,0x038a), S(0x038c), S(0x038e), S(0x038f), R(0x0391,0x03a1), R(0x03a3,0x03ab), + S(0x03c2), S(0x03cf), S(0x03d0), S(0x03d1), S(0x03d5), S(0x03d6), R(0x03d8,0x03ee), S(0x03f0), S(0x03f1), + S(0x03f4), S(0x03f5), S(0x03f7), S(0x03f9), S(0x03fa), R(0x03fd,0x03ff), R(0x0400,0x040f), + R(0x0410,0x042f), R(0x0460,0x0480), R(0x048a,0x04be), S(0x04c0), R(0x04c1,0x04cd), R(0x04d0,0x052e), + R(0x0531,0x0556), R(0x10a0,0x10c5), S(0x10c7), S(0x10cd), R(0x13f8,0x13fd), S(0x1c80), S(0x1c81), + S(0x1c82), S(0x1c83), S(0x1c84), S(0x1c85), S(0x1c86), S(0x1c87), S(0x1c88), R(0x1c90,0x1cba), + R(0x1cbd,0x1cbf), R(0x1e00,0x1e94), S(0x1e9b), R(0x1ea0,0x1efe), R(0x1f08,0x1f0f), R(0x1f18,0x1f1d), + R(0x1f28,0x1f2f), R(0x1f38,0x1f3f), R(0x1f48,0x1f4d), S(0x1f59), S(0x1f5b), S(0x1f5d), S(0x1f5f), + R(0x1f68,0x1f6f), S(0x1fb8), S(0x1fb9), S(0x1fba), S(0x1fbb), S(0x1fbe), R(0x1fc8,0x1fcb), S(0x1fd8), + S(0x1fd9), S(0x1fda), S(0x1fdb), S(0x1fe8), S(0x1fe9), S(0x1fea), S(0x1feb), S(0x1fec), S(0x1ff8), + S(0x1ff9), S(0x1ffa), S(0x1ffb), S(0x2126), S(0x212a), S(0x212b), S(0x2132), R(0x2160,0x216f), S(0x2183), + R(0x24b6,0x24cf), R(0x2c00,0x2c2e), S(0x2c60), S(0x2c62), S(0x2c63), S(0x2c64), R(0x2c67,0x2c6b), + S(0x2c6d), S(0x2c6e), S(0x2c6f), S(0x2c70), S(0x2c72), S(0x2c75), S(0x2c7e), S(0x2c7f), R(0x2c80,0x2ce2), + S(0x2ceb), S(0x2ced), S(0x2cf2), R(0xa640,0xa66c), R(0xa680,0xa69a), R(0xa722,0xa72e), R(0xa732,0xa76e), + S(0xa779), S(0xa77b), S(0xa77d), R(0xa77e,0xa786), S(0xa78b), S(0xa78d), S(0xa790), S(0xa792), + R(0xa796,0xa7a8), S(0xa7aa), S(0xa7ab), S(0xa7ac), S(0xa7ad), S(0xa7ae), S(0xa7b0), S(0xa7b1), S(0xa7b2), + S(0xa7b3), R(0xa7b4,0xa7be), S(0xa7c2), S(0xa7c4), S(0xa7c5), S(0xa7c6), S(0xa7c7), S(0xa7c9), S(0xa7f5), + R(0xab70,0xabbf), R(0xff21,0xff3a), R(0x10400,0x10427), R(0x104b0,0x104d3), R(0x10c80,0x10cb2), + R(0x118a0,0x118bf), R(0x16e40,0x16e5f), R(0x1e900,0x1e921) + }; + static const unsigned FOLD_MAP_1_DATA[] = { + 0x0061, 0x007a, 0x03bc, 0x00e0, 0x00f6, 0x00f8, 0x00fe, 0x0101, 0x012f, 0x0133, 0x0137, 0x013a, 0x0148, + 0x014b, 0x0177, 0x00ff, 0x017a, 0x017e, 0x0073, 0x0253, 0x0183, 0x0185, 0x0254, 0x0188, 0x0256, 0x0257, + 0x018c, 0x01dd, 0x0259, 0x025b, 0x0192, 0x0260, 0x0263, 0x0269, 0x0268, 0x0199, 0x026f, 0x0272, 0x0275, + 0x01a1, 0x01a5, 0x0280, 0x01a8, 0x0283, 0x01ad, 0x0288, 0x01b0, 0x028a, 0x028b, 0x01b4, 0x01b6, 0x0292, + 0x01b9, 0x01bd, 0x01c6, 0x01c6, 0x01c9, 0x01c9, 0x01cc, 0x01cc, 0x01dc, 0x01df, 0x01ef, 0x01f3, 0x01f3, + 0x01f5, 0x0195, 0x01bf, 0x01f9, 0x021f, 0x019e, 0x0223, 0x0233, 0x2c65, 0x023c, 0x019a, 0x2c66, 0x0242, + 0x0180, 0x0289, 0x028c, 0x0247, 0x024f, 0x03b9, 0x0371, 0x0373, 0x0377, 0x03f3, 0x03ac, 0x03ad, 0x03af, + 0x03cc, 0x03cd, 0x03ce, 0x03b1, 0x03c1, 0x03c3, 0x03cb, 0x03c3, 0x03d7, 0x03b2, 0x03b8, 0x03c6, 0x03c0, + 0x03d9, 0x03ef, 0x03ba, 0x03c1, 0x03b8, 0x03b5, 0x03f8, 0x03f2, 0x03fb, 0x037b, 0x037d, 0x0450, 0x045f, + 0x0430, 0x044f, 0x0461, 0x0481, 0x048b, 0x04bf, 0x04cf, 0x04c2, 0x04ce, 0x04d1, 0x052f, 0x0561, 0x0586, + 0x2d00, 0x2d25, 0x2d27, 0x2d2d, 0x13f0, 0x13f5, 0x0432, 0x0434, 0x043e, 0x0441, 0x0442, 0x0442, 0x044a, + 0x0463, 0xa64b, 0x10d0, 0x10fa, 0x10fd, 0x10ff, 0x1e01, 0x1e95, 0x1e61, 0x1ea1, 0x1eff, 0x1f00, 0x1f07, + 0x1f10, 0x1f15, 0x1f20, 0x1f27, 0x1f30, 0x1f37, 0x1f40, 0x1f45, 0x1f51, 0x1f53, 0x1f55, 0x1f57, 0x1f60, + 0x1f67, 0x1fb0, 0x1fb1, 0x1f70, 0x1f71, 0x03b9, 0x1f72, 0x1f75, 0x1fd0, 0x1fd1, 0x1f76, 0x1f77, 0x1fe0, + 0x1fe1, 0x1f7a, 0x1f7b, 0x1fe5, 0x1f78, 0x1f79, 0x1f7c, 0x1f7d, 0x03c9, 0x006b, 0x00e5, 0x214e, 0x2170, + 0x217f, 0x2184, 0x24d0, 0x24e9, 0x2c30, 0x2c5e, 0x2c61, 0x026b, 0x1d7d, 0x027d, 0x2c68, 0x2c6c, 0x0251, + 0x0271, 0x0250, 0x0252, 0x2c73, 0x2c76, 0x023f, 0x0240, 0x2c81, 0x2ce3, 0x2cec, 0x2cee, 0x2cf3, 0xa641, + 0xa66d, 0xa681, 0xa69b, 0xa723, 0xa72f, 0xa733, 0xa76f, 0xa77a, 0xa77c, 0x1d79, 0xa77f, 0xa787, 0xa78c, + 0x0265, 0xa791, 0xa793, 0xa797, 0xa7a9, 0x0266, 0x025c, 0x0261, 0x026c, 0x026a, 0x029e, 0x0287, 0x029d, + 0xab53, 0xa7b5, 0xa7bf, 0xa7c3, 0xa794, 0x0282, 0x1d8e, 0xa7c8, 0xa7ca, 0xa7f6, 0x13a0, 0x13ef, 0xff41, + 0xff5a, 0x10428, 0x1044f, 0x104d8, 0x104fb, 0x10cc0, 0x10cf2, 0x118c0, 0x118df, 0x16e60, 0x16e7f, 0x1e922, + 0x1e943 + }; + static const unsigned FOLD_MAP_2[] = { + S(0x00df), S(0x0130), S(0x0149), S(0x01f0), S(0x0587), S(0x1e96), S(0x1e97), S(0x1e98), S(0x1e99), + S(0x1e9a), S(0x1e9e), S(0x1f50), R(0x1f80,0x1f87), R(0x1f88,0x1f8f), R(0x1f90,0x1f97), R(0x1f98,0x1f9f), + R(0x1fa0,0x1fa7), R(0x1fa8,0x1faf), S(0x1fb2), S(0x1fb3), S(0x1fb4), S(0x1fb6), S(0x1fbc), S(0x1fc2), + S(0x1fc3), S(0x1fc4), S(0x1fc6), S(0x1fcc), S(0x1fd6), S(0x1fe4), S(0x1fe6), S(0x1ff2), S(0x1ff3), + S(0x1ff4), S(0x1ff6), S(0x1ffc), S(0xfb00), S(0xfb01), S(0xfb02), S(0xfb05), S(0xfb06), S(0xfb13), + S(0xfb14), S(0xfb15), S(0xfb16), S(0xfb17) + }; + static const unsigned FOLD_MAP_2_DATA[] = { + 0x0073,0x0073, 0x0069,0x0307, 0x02bc,0x006e, 0x006a,0x030c, 0x0565,0x0582, 0x0068,0x0331, 0x0074,0x0308, + 0x0077,0x030a, 0x0079,0x030a, 0x0061,0x02be, 0x0073,0x0073, 0x03c5,0x0313, 0x1f00,0x03b9, 0x1f07,0x03b9, + 0x1f00,0x03b9, 0x1f07,0x03b9, 0x1f20,0x03b9, 0x1f27,0x03b9, 0x1f20,0x03b9, 0x1f27,0x03b9, 0x1f60,0x03b9, + 0x1f67,0x03b9, 0x1f60,0x03b9, 0x1f67,0x03b9, 0x1f70,0x03b9, 0x03b1,0x03b9, 0x03ac,0x03b9, 0x03b1,0x0342, + 0x03b1,0x03b9, 0x1f74,0x03b9, 0x03b7,0x03b9, 0x03ae,0x03b9, 0x03b7,0x0342, 0x03b7,0x03b9, 0x03b9,0x0342, + 0x03c1,0x0313, 0x03c5,0x0342, 0x1f7c,0x03b9, 0x03c9,0x03b9, 0x03ce,0x03b9, 0x03c9,0x0342, 0x03c9,0x03b9, + 0x0066,0x0066, 0x0066,0x0069, 0x0066,0x006c, 0x0073,0x0074, 0x0073,0x0074, 0x0574,0x0576, 0x0574,0x0565, + 0x0574,0x056b, 0x057e,0x0576, 0x0574,0x056d + }; + static const unsigned FOLD_MAP_3[] = { + S(0x0390), S(0x03b0), S(0x1f52), S(0x1f54), S(0x1f56), S(0x1fb7), S(0x1fc7), S(0x1fd2), S(0x1fd3), + S(0x1fd7), S(0x1fe2), S(0x1fe3), S(0x1fe7), S(0x1ff7), S(0xfb03), S(0xfb04) + }; + static const unsigned FOLD_MAP_3_DATA[] = { + 0x03b9,0x0308,0x0301, 0x03c5,0x0308,0x0301, 0x03c5,0x0313,0x0300, 0x03c5,0x0313,0x0301, + 0x03c5,0x0313,0x0342, 0x03b1,0x0342,0x03b9, 0x03b7,0x0342,0x03b9, 0x03b9,0x0308,0x0300, + 0x03b9,0x0308,0x0301, 0x03b9,0x0308,0x0342, 0x03c5,0x0308,0x0300, 0x03c5,0x0308,0x0301, + 0x03c5,0x0308,0x0342, 0x03c9,0x0342,0x03b9, 0x0066,0x0066,0x0069, 0x0066,0x0066,0x006c + }; +#undef R +#undef S + static const struct { + const unsigned* map; + const unsigned* data; + size_t map_size; + unsigned n_codepoints; + } FOLD_MAP_LIST[] = { + { FOLD_MAP_1, FOLD_MAP_1_DATA, SIZEOF_ARRAY(FOLD_MAP_1), 1 }, + { FOLD_MAP_2, FOLD_MAP_2_DATA, SIZEOF_ARRAY(FOLD_MAP_2), 2 }, + { FOLD_MAP_3, FOLD_MAP_3_DATA, SIZEOF_ARRAY(FOLD_MAP_3), 3 } + }; + + int i; + + /* Fast path for ASCII characters. */ + if(codepoint <= 0x7f) { + info->codepoints[0] = codepoint; + if(ISUPPER_(codepoint)) + info->codepoints[0] += 'a' - 'A'; + info->n_codepoints = 1; + return; + } + + /* Try to locate the codepoint in any of the maps. */ + for(i = 0; i < (int) SIZEOF_ARRAY(FOLD_MAP_LIST); i++) { + int index; + + index = md_unicode_bsearch__(codepoint, FOLD_MAP_LIST[i].map, FOLD_MAP_LIST[i].map_size); + if(index >= 0) { + /* Found the mapping. */ + unsigned n_codepoints = FOLD_MAP_LIST[i].n_codepoints; + const unsigned* map = FOLD_MAP_LIST[i].map; + const unsigned* codepoints = FOLD_MAP_LIST[i].data + (index * n_codepoints); + + memcpy(info->codepoints, codepoints, sizeof(unsigned) * n_codepoints); + info->n_codepoints = n_codepoints; + + if(FOLD_MAP_LIST[i].map[index] != codepoint) { + /* The found mapping maps whole range of codepoints, + * i.e. we have to offset info->codepoints[0] accordingly. */ + if((map[index] & 0x00ffffff)+1 == codepoints[0]) { + /* Alternating type of the range. */ + info->codepoints[0] = codepoint + ((codepoint & 0x1) == (map[index] & 0x1) ? 1 : 0); + } else { + /* Range to range kind of mapping. */ + info->codepoints[0] += (codepoint - (map[index] & 0x00ffffff)); + } + } + + return; + } + } + + /* No mapping found. Map the codepoint to itself. */ + info->codepoints[0] = codepoint; + info->n_codepoints = 1; + } +#endif + + +#if defined MD4C_USE_UTF16 + #define IS_UTF16_SURROGATE_HI(word) (((WORD)(word) & 0xfc00) == 0xd800) + #define IS_UTF16_SURROGATE_LO(word) (((WORD)(word) & 0xfc00) == 0xdc00) + #define UTF16_DECODE_SURROGATE(hi, lo) (0x10000 + ((((unsigned)(hi) & 0x3ff) << 10) | (((unsigned)(lo) & 0x3ff) << 0))) + + static unsigned + md_decode_utf16le__(const CHAR* str, SZ str_size, SZ* p_size) + { + if(IS_UTF16_SURROGATE_HI(str[0])) { + if(1 < str_size && IS_UTF16_SURROGATE_LO(str[1])) { + if(p_size != NULL) + *p_size = 2; + return UTF16_DECODE_SURROGATE(str[0], str[1]); + } + } + + if(p_size != NULL) + *p_size = 1; + return str[0]; + } + + static unsigned + md_decode_utf16le_before__(MD_CTX* ctx, OFF off) + { + if(off > 2 && IS_UTF16_SURROGATE_HI(CH(off-2)) && IS_UTF16_SURROGATE_LO(CH(off-1))) + return UTF16_DECODE_SURROGATE(CH(off-2), CH(off-1)); + + return CH(off); + } + + /* No whitespace uses surrogates, so no decoding needed here. */ + #define ISUNICODEWHITESPACE_(codepoint) md_is_unicode_whitespace__(codepoint) + #define ISUNICODEWHITESPACE(off) md_is_unicode_whitespace__(CH(off)) + #define ISUNICODEWHITESPACEBEFORE(off) md_is_unicode_whitespace__(CH((off)-1)) + + #define ISUNICODEPUNCT(off) md_is_unicode_punct__(md_decode_utf16le__(STR(off), ctx->size - (off), NULL)) + #define ISUNICODEPUNCTBEFORE(off) md_is_unicode_punct__(md_decode_utf16le_before__(ctx, off)) + + static inline int + md_decode_unicode(const CHAR* str, OFF off, SZ str_size, SZ* p_char_size) + { + return md_decode_utf16le__(str+off, str_size-off, p_char_size); + } +#elif defined MD4C_USE_UTF8 + #define IS_UTF8_LEAD1(byte) ((unsigned char)(byte) <= 0x7f) + #define IS_UTF8_LEAD2(byte) (((unsigned char)(byte) & 0xe0) == 0xc0) + #define IS_UTF8_LEAD3(byte) (((unsigned char)(byte) & 0xf0) == 0xe0) + #define IS_UTF8_LEAD4(byte) (((unsigned char)(byte) & 0xf8) == 0xf0) + #define IS_UTF8_TAIL(byte) (((unsigned char)(byte) & 0xc0) == 0x80) + + static unsigned + md_decode_utf8__(const CHAR* str, SZ str_size, SZ* p_size) + { + if(!IS_UTF8_LEAD1(str[0])) { + if(IS_UTF8_LEAD2(str[0])) { + if(1 < str_size && IS_UTF8_TAIL(str[1])) { + if(p_size != NULL) + *p_size = 2; + + return (((unsigned int)str[0] & 0x1f) << 6) | + (((unsigned int)str[1] & 0x3f) << 0); + } + } else if(IS_UTF8_LEAD3(str[0])) { + if(2 < str_size && IS_UTF8_TAIL(str[1]) && IS_UTF8_TAIL(str[2])) { + if(p_size != NULL) + *p_size = 3; + + return (((unsigned int)str[0] & 0x0f) << 12) | + (((unsigned int)str[1] & 0x3f) << 6) | + (((unsigned int)str[2] & 0x3f) << 0); + } + } else if(IS_UTF8_LEAD4(str[0])) { + if(3 < str_size && IS_UTF8_TAIL(str[1]) && IS_UTF8_TAIL(str[2]) && IS_UTF8_TAIL(str[3])) { + if(p_size != NULL) + *p_size = 4; + + return (((unsigned int)str[0] & 0x07) << 18) | + (((unsigned int)str[1] & 0x3f) << 12) | + (((unsigned int)str[2] & 0x3f) << 6) | + (((unsigned int)str[3] & 0x3f) << 0); + } + } + } + + if(p_size != NULL) + *p_size = 1; + return (unsigned) str[0]; + } + + static unsigned + md_decode_utf8_before__(MD_CTX* ctx, OFF off) + { + if(!IS_UTF8_LEAD1(CH(off-1))) { + if(off > 1 && IS_UTF8_LEAD2(CH(off-2)) && IS_UTF8_TAIL(CH(off-1))) + return (((unsigned int)CH(off-2) & 0x1f) << 6) | + (((unsigned int)CH(off-1) & 0x3f) << 0); + + if(off > 2 && IS_UTF8_LEAD3(CH(off-3)) && IS_UTF8_TAIL(CH(off-2)) && IS_UTF8_TAIL(CH(off-1))) + return (((unsigned int)CH(off-3) & 0x0f) << 12) | + (((unsigned int)CH(off-2) & 0x3f) << 6) | + (((unsigned int)CH(off-1) & 0x3f) << 0); + + if(off > 3 && IS_UTF8_LEAD4(CH(off-4)) && IS_UTF8_TAIL(CH(off-3)) && IS_UTF8_TAIL(CH(off-2)) && IS_UTF8_TAIL(CH(off-1))) + return (((unsigned int)CH(off-4) & 0x07) << 18) | + (((unsigned int)CH(off-3) & 0x3f) << 12) | + (((unsigned int)CH(off-2) & 0x3f) << 6) | + (((unsigned int)CH(off-1) & 0x3f) << 0); + } + + return (unsigned) CH(off-1); + } + + #define ISUNICODEWHITESPACE_(codepoint) md_is_unicode_whitespace__(codepoint) + #define ISUNICODEWHITESPACE(off) md_is_unicode_whitespace__(md_decode_utf8__(STR(off), ctx->size - (off), NULL)) + #define ISUNICODEWHITESPACEBEFORE(off) md_is_unicode_whitespace__(md_decode_utf8_before__(ctx, off)) + + #define ISUNICODEPUNCT(off) md_is_unicode_punct__(md_decode_utf8__(STR(off), ctx->size - (off), NULL)) + #define ISUNICODEPUNCTBEFORE(off) md_is_unicode_punct__(md_decode_utf8_before__(ctx, off)) + + static inline unsigned + md_decode_unicode(const CHAR* str, OFF off, SZ str_size, SZ* p_char_size) + { + return md_decode_utf8__(str+off, str_size-off, p_char_size); + } +#else + #define ISUNICODEWHITESPACE_(codepoint) ISWHITESPACE_(codepoint) + #define ISUNICODEWHITESPACE(off) ISWHITESPACE(off) + #define ISUNICODEWHITESPACEBEFORE(off) ISWHITESPACE((off)-1) + + #define ISUNICODEPUNCT(off) ISPUNCT(off) + #define ISUNICODEPUNCTBEFORE(off) ISPUNCT((off)-1) + + static inline void + md_get_unicode_fold_info(unsigned codepoint, MD_UNICODE_FOLD_INFO* info) + { + info->codepoints[0] = codepoint; + if(ISUPPER_(codepoint)) + info->codepoints[0] += 'a' - 'A'; + info->n_codepoints = 1; + } + + static inline unsigned + md_decode_unicode(const CHAR* str, OFF off, SZ str_size, SZ* p_size) + { + *p_size = 1; + return (unsigned) str[off]; + } +#endif + + +/************************************* + *** Helper string manipulations *** + *************************************/ + +/* Fill buffer with copy of the string between 'beg' and 'end' but replace any + * line breaks with given replacement character. + * + * NOTE: Caller is responsible to make sure the buffer is large enough. + * (Given the output is always shorter then input, (end - beg) is good idea + * what the caller should allocate.) + */ +static void +md_merge_lines(MD_CTX* ctx, OFF beg, OFF end, const MD_LINE* lines, int n_lines, + CHAR line_break_replacement_char, CHAR* buffer, SZ* p_size) +{ + CHAR* ptr = buffer; + int line_index = 0; + OFF off = beg; + + MD_UNUSED(n_lines); + + while(1) { + const MD_LINE* line = &lines[line_index]; + OFF line_end = line->end; + if(end < line_end) + line_end = end; + + while(off < line_end) { + *ptr = CH(off); + ptr++; + off++; + } + + if(off >= end) { + *p_size = (MD_SIZE)(ptr - buffer); + return; + } + + *ptr = line_break_replacement_char; + ptr++; + + line_index++; + off = lines[line_index].beg; + } +} + +/* Wrapper of md_merge_lines() which allocates new buffer for the output string. + */ +static int +md_merge_lines_alloc(MD_CTX* ctx, OFF beg, OFF end, const MD_LINE* lines, int n_lines, + CHAR line_break_replacement_char, CHAR** p_str, SZ* p_size) +{ + CHAR* buffer; + + buffer = (CHAR*) malloc(sizeof(CHAR) * (end - beg)); + if(buffer == NULL) { + MD_LOG("malloc() failed."); + return -1; + } + + md_merge_lines(ctx, beg, end, lines, n_lines, + line_break_replacement_char, buffer, p_size); + + *p_str = buffer; + return 0; +} + +static OFF +md_skip_unicode_whitespace(const CHAR* label, OFF off, SZ size) +{ + SZ char_size; + unsigned codepoint; + + while(off < size) { + codepoint = md_decode_unicode(label, off, size, &char_size); + if(!ISUNICODEWHITESPACE_(codepoint) && !ISNEWLINE_(label[off])) + break; + off += char_size; + } + + return off; +} + + +/****************************** + *** Recognizing raw HTML *** + ******************************/ + +/* md_is_html_tag() may be called when processing inlines (inline raw HTML) + * or when breaking document to blocks (checking for start of HTML block type 7). + * + * When breaking document to blocks, we do not yet know line boundaries, but + * in that case the whole tag has to live on a single line. We distinguish this + * by n_lines == 0. + */ +static int +md_is_html_tag(MD_CTX* ctx, const MD_LINE* lines, int n_lines, OFF beg, OFF max_end, OFF* p_end) +{ + int attr_state; + OFF off = beg; + OFF line_end = (n_lines > 0) ? lines[0].end : ctx->size; + int i = 0; + + MD_ASSERT(CH(beg) == _T('<')); + + if(off + 1 >= line_end) + return FALSE; + off++; + + /* For parsing attributes, we need a little state automaton below. + * State -1: no attributes are allowed. + * State 0: attribute could follow after some whitespace. + * State 1: after a whitespace (attribute name may follow). + * State 2: after attribute name ('=' MAY follow). + * State 3: after '=' (value specification MUST follow). + * State 41: in middle of unquoted attribute value. + * State 42: in middle of single-quoted attribute value. + * State 43: in middle of double-quoted attribute value. + */ + attr_state = 0; + + if(CH(off) == _T('/')) { + /* Closer tag "</ ... >". No attributes may be present. */ + attr_state = -1; + off++; + } + + /* Tag name */ + if(off >= line_end || !ISALPHA(off)) + return FALSE; + off++; + while(off < line_end && (ISALNUM(off) || CH(off) == _T('-'))) + off++; + + /* (Optional) attributes (if not closer), (optional) '/' (if not closer) + * and final '>'. */ + while(1) { + while(off < line_end && !ISNEWLINE(off)) { + if(attr_state > 40) { + if(attr_state == 41 && (ISBLANK(off) || ISANYOF(off, _T("\"'=<>`")))) { + attr_state = 0; + off--; /* Put the char back for re-inspection in the new state. */ + } else if(attr_state == 42 && CH(off) == _T('\'')) { + attr_state = 0; + } else if(attr_state == 43 && CH(off) == _T('"')) { + attr_state = 0; + } + off++; + } else if(ISWHITESPACE(off)) { + if(attr_state == 0) + attr_state = 1; + off++; + } else if(attr_state <= 2 && CH(off) == _T('>')) { + /* End. */ + goto done; + } else if(attr_state <= 2 && CH(off) == _T('/') && off+1 < line_end && CH(off+1) == _T('>')) { + /* End with digraph '/>' */ + off++; + goto done; + } else if((attr_state == 1 || attr_state == 2) && (ISALPHA(off) || CH(off) == _T('_') || CH(off) == _T(':'))) { + off++; + /* Attribute name */ + while(off < line_end && (ISALNUM(off) || ISANYOF(off, _T("_.:-")))) + off++; + attr_state = 2; + } else if(attr_state == 2 && CH(off) == _T('=')) { + /* Attribute assignment sign */ + off++; + attr_state = 3; + } else if(attr_state == 3) { + /* Expecting start of attribute value. */ + if(CH(off) == _T('"')) + attr_state = 43; + else if(CH(off) == _T('\'')) + attr_state = 42; + else if(!ISANYOF(off, _T("\"'=<>`")) && !ISNEWLINE(off)) + attr_state = 41; + else + return FALSE; + off++; + } else { + /* Anything unexpected. */ + return FALSE; + } + } + + /* We have to be on a single line. See definition of start condition + * of HTML block, type 7. */ + if(n_lines == 0) + return FALSE; + + i++; + if(i >= n_lines) + return FALSE; + + off = lines[i].beg; + line_end = lines[i].end; + + if(attr_state == 0 || attr_state == 41) + attr_state = 1; + + if(off >= max_end) + return FALSE; + } + +done: + if(off >= max_end) + return FALSE; + + *p_end = off+1; + return TRUE; +} + +static int +md_scan_for_html_closer(MD_CTX* ctx, const MD_CHAR* str, MD_SIZE len, + const MD_LINE* lines, int n_lines, + OFF beg, OFF max_end, OFF* p_end, + OFF* p_scan_horizon) +{ + OFF off = beg; + int i = 0; + + if(off < *p_scan_horizon && *p_scan_horizon >= max_end - len) { + /* We have already scanned the range up to the max_end so we know + * there is nothing to see. */ + return FALSE; + } + + while(TRUE) { + while(off + len <= lines[i].end && off + len <= max_end) { + if(md_ascii_eq(STR(off), str, len)) { + /* Success. */ + *p_end = off + len; + return TRUE; + } + off++; + } + + i++; + if(off >= max_end || i >= n_lines) { + /* Failure. */ + *p_scan_horizon = off; + return FALSE; + } + + off = lines[i].beg; + } +} + +static int +md_is_html_comment(MD_CTX* ctx, const MD_LINE* lines, int n_lines, OFF beg, OFF max_end, OFF* p_end) +{ + OFF off = beg; + + MD_ASSERT(CH(beg) == _T('<')); + + if(off + 4 >= lines[0].end) + return FALSE; + if(CH(off+1) != _T('!') || CH(off+2) != _T('-') || CH(off+3) != _T('-')) + return FALSE; + off += 4; + + /* ">" and "->" must not follow the opening. */ + if(off < lines[0].end && CH(off) == _T('>')) + return FALSE; + if(off+1 < lines[0].end && CH(off) == _T('-') && CH(off+1) == _T('>')) + return FALSE; + + /* HTML comment must not contain "--", so we scan just for "--" instead + * of "-->" and verify manually that '>' follows. */ + if(md_scan_for_html_closer(ctx, _T("--"), 2, + lines, n_lines, off, max_end, p_end, &ctx->html_comment_horizon)) + { + if(*p_end < max_end && CH(*p_end) == _T('>')) { + *p_end = *p_end + 1; + return TRUE; + } + } + + return FALSE; +} + +static int +md_is_html_processing_instruction(MD_CTX* ctx, const MD_LINE* lines, int n_lines, OFF beg, OFF max_end, OFF* p_end) +{ + OFF off = beg; + + if(off + 2 >= lines[0].end) + return FALSE; + if(CH(off+1) != _T('?')) + return FALSE; + off += 2; + + return md_scan_for_html_closer(ctx, _T("?>"), 2, + lines, n_lines, off, max_end, p_end, &ctx->html_proc_instr_horizon); +} + +static int +md_is_html_declaration(MD_CTX* ctx, const MD_LINE* lines, int n_lines, OFF beg, OFF max_end, OFF* p_end) +{ + OFF off = beg; + + if(off + 2 >= lines[0].end) + return FALSE; + if(CH(off+1) != _T('!')) + return FALSE; + off += 2; + + /* Declaration name. */ + if(off >= lines[0].end || !ISALPHA(off)) + return FALSE; + off++; + while(off < lines[0].end && ISALPHA(off)) + off++; + if(off < lines[0].end && !ISWHITESPACE(off)) + return FALSE; + + return md_scan_for_html_closer(ctx, _T(">"), 1, + lines, n_lines, off, max_end, p_end, &ctx->html_decl_horizon); +} + +static int +md_is_html_cdata(MD_CTX* ctx, const MD_LINE* lines, int n_lines, OFF beg, OFF max_end, OFF* p_end) +{ + static const CHAR open_str[] = _T("<![CDATA["); + static const SZ open_size = SIZEOF_ARRAY(open_str) - 1; + + OFF off = beg; + + if(off + open_size >= lines[0].end) + return FALSE; + if(memcmp(STR(off), open_str, open_size) != 0) + return FALSE; + off += open_size; + + if(lines[n_lines-1].end < max_end) + max_end = lines[n_lines-1].end - 2; + + return md_scan_for_html_closer(ctx, _T("]]>"), 3, + lines, n_lines, off, max_end, p_end, &ctx->html_cdata_horizon); +} + +static int +md_is_html_any(MD_CTX* ctx, const MD_LINE* lines, int n_lines, OFF beg, OFF max_end, OFF* p_end) +{ + MD_ASSERT(CH(beg) == _T('<')); + return (md_is_html_tag(ctx, lines, n_lines, beg, max_end, p_end) || + md_is_html_comment(ctx, lines, n_lines, beg, max_end, p_end) || + md_is_html_processing_instruction(ctx, lines, n_lines, beg, max_end, p_end) || + md_is_html_declaration(ctx, lines, n_lines, beg, max_end, p_end) || + md_is_html_cdata(ctx, lines, n_lines, beg, max_end, p_end)); +} + + +/**************************** + *** Recognizing Entity *** + ****************************/ + +static int +md_is_hex_entity_contents(MD_CTX* ctx, const CHAR* text, OFF beg, OFF max_end, OFF* p_end) +{ + OFF off = beg; + MD_UNUSED(ctx); + + while(off < max_end && ISXDIGIT_(text[off]) && off - beg <= 8) + off++; + + if(1 <= off - beg && off - beg <= 6) { + *p_end = off; + return TRUE; + } else { + return FALSE; + } +} + +static int +md_is_dec_entity_contents(MD_CTX* ctx, const CHAR* text, OFF beg, OFF max_end, OFF* p_end) +{ + OFF off = beg; + MD_UNUSED(ctx); + + while(off < max_end && ISDIGIT_(text[off]) && off - beg <= 8) + off++; + + if(1 <= off - beg && off - beg <= 7) { + *p_end = off; + return TRUE; + } else { + return FALSE; + } +} + +static int +md_is_named_entity_contents(MD_CTX* ctx, const CHAR* text, OFF beg, OFF max_end, OFF* p_end) +{ + OFF off = beg; + MD_UNUSED(ctx); + + if(off < max_end && ISALPHA_(text[off])) + off++; + else + return FALSE; + + while(off < max_end && ISALNUM_(text[off]) && off - beg <= 48) + off++; + + if(2 <= off - beg && off - beg <= 48) { + *p_end = off; + return TRUE; + } else { + return FALSE; + } +} + +static int +md_is_entity_str(MD_CTX* ctx, const CHAR* text, OFF beg, OFF max_end, OFF* p_end) +{ + int is_contents; + OFF off = beg; + + MD_ASSERT(text[off] == _T('&')); + off++; + + if(off+2 < max_end && text[off] == _T('#') && (text[off+1] == _T('x') || text[off+1] == _T('X'))) + is_contents = md_is_hex_entity_contents(ctx, text, off+2, max_end, &off); + else if(off+1 < max_end && text[off] == _T('#')) + is_contents = md_is_dec_entity_contents(ctx, text, off+1, max_end, &off); + else + is_contents = md_is_named_entity_contents(ctx, text, off, max_end, &off); + + if(is_contents && off < max_end && text[off] == _T(';')) { + *p_end = off+1; + return TRUE; + } else { + return FALSE; + } +} + +static inline int +md_is_entity(MD_CTX* ctx, OFF beg, OFF max_end, OFF* p_end) +{ + return md_is_entity_str(ctx, ctx->text, beg, max_end, p_end); +} + + +/****************************** + *** Attribute Management *** + ******************************/ + +typedef struct MD_ATTRIBUTE_BUILD_tag MD_ATTRIBUTE_BUILD; +struct MD_ATTRIBUTE_BUILD_tag { + CHAR* text; + MD_TEXTTYPE* substr_types; + OFF* substr_offsets; + int substr_count; + int substr_alloc; + MD_TEXTTYPE trivial_types[1]; + OFF trivial_offsets[2]; +}; + + +#define MD_BUILD_ATTR_NO_ESCAPES 0x0001 + +static int +md_build_attr_append_substr(MD_CTX* ctx, MD_ATTRIBUTE_BUILD* build, + MD_TEXTTYPE type, OFF off) +{ + if(build->substr_count >= build->substr_alloc) { + MD_TEXTTYPE* new_substr_types; + OFF* new_substr_offsets; + + build->substr_alloc = (build->substr_alloc > 0 + ? build->substr_alloc + build->substr_alloc / 2 + : 8); + new_substr_types = (MD_TEXTTYPE*) realloc(build->substr_types, + build->substr_alloc * sizeof(MD_TEXTTYPE)); + if(new_substr_types == NULL) { + MD_LOG("realloc() failed."); + return -1; + } + /* Note +1 to reserve space for final offset (== raw_size). */ + new_substr_offsets = (OFF*) realloc(build->substr_offsets, + (build->substr_alloc+1) * sizeof(OFF)); + if(new_substr_offsets == NULL) { + MD_LOG("realloc() failed."); + free(new_substr_types); + return -1; + } + + build->substr_types = new_substr_types; + build->substr_offsets = new_substr_offsets; + } + + build->substr_types[build->substr_count] = type; + build->substr_offsets[build->substr_count] = off; + build->substr_count++; + return 0; +} + +static void +md_free_attribute(MD_CTX* ctx, MD_ATTRIBUTE_BUILD* build) +{ + MD_UNUSED(ctx); + + if(build->substr_alloc > 0) { + free(build->text); + free(build->substr_types); + free(build->substr_offsets); + } +} + +static int +md_build_attribute(MD_CTX* ctx, const CHAR* raw_text, SZ raw_size, + unsigned flags, MD_ATTRIBUTE* attr, MD_ATTRIBUTE_BUILD* build) +{ + OFF raw_off, off; + int is_trivial; + int ret = 0; + + memset(build, 0, sizeof(MD_ATTRIBUTE_BUILD)); + + /* If there is no backslash and no ampersand, build trivial attribute + * without any malloc(). */ + is_trivial = TRUE; + for(raw_off = 0; raw_off < raw_size; raw_off++) { + if(ISANYOF3_(raw_text[raw_off], _T('\\'), _T('&'), _T('\0'))) { + is_trivial = FALSE; + break; + } + } + + if(is_trivial) { + build->text = (CHAR*) (raw_size ? raw_text : NULL); + build->substr_types = build->trivial_types; + build->substr_offsets = build->trivial_offsets; + build->substr_count = 1; + build->substr_alloc = 0; + build->trivial_types[0] = MD_TEXT_NORMAL; + build->trivial_offsets[0] = 0; + build->trivial_offsets[1] = raw_size; + off = raw_size; + } else { + build->text = (CHAR*) malloc(raw_size * sizeof(CHAR)); + if(build->text == NULL) { + MD_LOG("malloc() failed."); + goto abort; + } + + raw_off = 0; + off = 0; + + while(raw_off < raw_size) { + if(raw_text[raw_off] == _T('\0')) { + MD_CHECK(md_build_attr_append_substr(ctx, build, MD_TEXT_NULLCHAR, off)); + memcpy(build->text + off, raw_text + raw_off, 1); + off++; + raw_off++; + continue; + } + + if(raw_text[raw_off] == _T('&')) { + OFF ent_end; + + if(md_is_entity_str(ctx, raw_text, raw_off, raw_size, &ent_end)) { + MD_CHECK(md_build_attr_append_substr(ctx, build, MD_TEXT_ENTITY, off)); + memcpy(build->text + off, raw_text + raw_off, ent_end - raw_off); + off += ent_end - raw_off; + raw_off = ent_end; + continue; + } + } + + if(build->substr_count == 0 || build->substr_types[build->substr_count-1] != MD_TEXT_NORMAL) + MD_CHECK(md_build_attr_append_substr(ctx, build, MD_TEXT_NORMAL, off)); + + if(!(flags & MD_BUILD_ATTR_NO_ESCAPES) && + raw_text[raw_off] == _T('\\') && raw_off+1 < raw_size && + (ISPUNCT_(raw_text[raw_off+1]) || ISNEWLINE_(raw_text[raw_off+1]))) + raw_off++; + + build->text[off++] = raw_text[raw_off++]; + } + build->substr_offsets[build->substr_count] = off; + } + + attr->text = build->text; + attr->size = off; + attr->substr_offsets = build->substr_offsets; + attr->substr_types = build->substr_types; + return 0; + +abort: + md_free_attribute(ctx, build); + return -1; +} + + +/********************************************* + *** Dictionary of Reference Definitions *** + *********************************************/ + +#define MD_FNV1A_BASE 2166136261U +#define MD_FNV1A_PRIME 16777619U + +static inline unsigned +md_fnv1a(unsigned base, const void* data, size_t n) +{ + const unsigned char* buf = (const unsigned char*) data; + unsigned hash = base; + size_t i; + + for(i = 0; i < n; i++) { + hash ^= buf[i]; + hash *= MD_FNV1A_PRIME; + } + + return hash; +} + + +struct MD_REF_DEF_tag { + CHAR* label; + CHAR* title; + unsigned hash; + SZ label_size; + SZ title_size; + OFF dest_beg; + OFF dest_end; + unsigned char label_needs_free : 1; + unsigned char title_needs_free : 1; +}; + +/* Label equivalence is quite complicated with regards to whitespace and case + * folding. This complicates computing a hash of it as well as direct comparison + * of two labels. */ + +static unsigned +md_link_label_hash(const CHAR* label, SZ size) +{ + unsigned hash = MD_FNV1A_BASE; + OFF off; + unsigned codepoint; + int is_whitespace = FALSE; + + off = md_skip_unicode_whitespace(label, 0, size); + while(off < size) { + SZ char_size; + + codepoint = md_decode_unicode(label, off, size, &char_size); + is_whitespace = ISUNICODEWHITESPACE_(codepoint) || ISNEWLINE_(label[off]); + + if(is_whitespace) { + codepoint = ' '; + hash = md_fnv1a(hash, &codepoint, sizeof(unsigned)); + off = md_skip_unicode_whitespace(label, off, size); + } else { + MD_UNICODE_FOLD_INFO fold_info; + + md_get_unicode_fold_info(codepoint, &fold_info); + hash = md_fnv1a(hash, fold_info.codepoints, fold_info.n_codepoints * sizeof(unsigned)); + off += char_size; + } + } + + return hash; +} + +static OFF +md_link_label_cmp_load_fold_info(const CHAR* label, OFF off, SZ size, + MD_UNICODE_FOLD_INFO* fold_info) +{ + unsigned codepoint; + SZ char_size; + + if(off >= size) { + /* Treat end of a link label as a whitespace. */ + goto whitespace; + } + + codepoint = md_decode_unicode(label, off, size, &char_size); + off += char_size; + if(ISUNICODEWHITESPACE_(codepoint)) { + /* Treat all whitespace as equivalent */ + goto whitespace; + } + + /* Get real folding info. */ + md_get_unicode_fold_info(codepoint, fold_info); + return off; + +whitespace: + fold_info->codepoints[0] = _T(' '); + fold_info->n_codepoints = 1; + return md_skip_unicode_whitespace(label, off, size); +} + +static int +md_link_label_cmp(const CHAR* a_label, SZ a_size, const CHAR* b_label, SZ b_size) +{ + OFF a_off; + OFF b_off; + MD_UNICODE_FOLD_INFO a_fi = { { 0 }, 0 }; + MD_UNICODE_FOLD_INFO b_fi = { { 0 }, 0 }; + OFF a_fi_off = 0; + OFF b_fi_off = 0; + int cmp; + + a_off = md_skip_unicode_whitespace(a_label, 0, a_size); + b_off = md_skip_unicode_whitespace(b_label, 0, b_size); + while(a_off < a_size || a_fi_off < a_fi.n_codepoints || + b_off < b_size || b_fi_off < b_fi.n_codepoints) + { + /* If needed, load fold info for next char. */ + if(a_fi_off >= a_fi.n_codepoints) { + a_fi_off = 0; + a_off = md_link_label_cmp_load_fold_info(a_label, a_off, a_size, &a_fi); + } + if(b_fi_off >= b_fi.n_codepoints) { + b_fi_off = 0; + b_off = md_link_label_cmp_load_fold_info(b_label, b_off, b_size, &b_fi); + } + + cmp = b_fi.codepoints[b_fi_off] - a_fi.codepoints[a_fi_off]; + if(cmp != 0) + return cmp; + + a_fi_off++; + b_fi_off++; + } + + return 0; +} + +typedef struct MD_REF_DEF_LIST_tag MD_REF_DEF_LIST; +struct MD_REF_DEF_LIST_tag { + int n_ref_defs; + int alloc_ref_defs; + MD_REF_DEF* ref_defs[]; /* Valid items always point into ctx->ref_defs[] */ +}; + +static int +md_ref_def_cmp(const void* a, const void* b) +{ + const MD_REF_DEF* a_ref = *(const MD_REF_DEF**)a; + const MD_REF_DEF* b_ref = *(const MD_REF_DEF**)b; + + if(a_ref->hash < b_ref->hash) + return -1; + else if(a_ref->hash > b_ref->hash) + return +1; + else + return md_link_label_cmp(a_ref->label, a_ref->label_size, b_ref->label, b_ref->label_size); +} + +static int +md_ref_def_cmp_for_sort(const void* a, const void* b) +{ + int cmp; + + cmp = md_ref_def_cmp(a, b); + + /* Ensure stability of the sorting. */ + if(cmp == 0) { + const MD_REF_DEF* a_ref = *(const MD_REF_DEF**)a; + const MD_REF_DEF* b_ref = *(const MD_REF_DEF**)b; + + if(a_ref < b_ref) + cmp = -1; + else if(a_ref > b_ref) + cmp = +1; + else + cmp = 0; + } + + return cmp; +} + +static int +md_build_ref_def_hashtable(MD_CTX* ctx) +{ + int i, j; + + if(ctx->n_ref_defs == 0) + return 0; + + ctx->ref_def_hashtable_size = (ctx->n_ref_defs * 5) / 4; + ctx->ref_def_hashtable = malloc(ctx->ref_def_hashtable_size * sizeof(void*)); + if(ctx->ref_def_hashtable == NULL) { + MD_LOG("malloc() failed."); + goto abort; + } + memset(ctx->ref_def_hashtable, 0, ctx->ref_def_hashtable_size * sizeof(void*)); + + /* Each member of ctx->ref_def_hashtable[] can be: + * -- NULL, + * -- pointer to the MD_REF_DEF in ctx->ref_defs[], or + * -- pointer to a MD_REF_DEF_LIST, which holds multiple pointers to + * such MD_REF_DEFs. + */ + for(i = 0; i < ctx->n_ref_defs; i++) { + MD_REF_DEF* def = &ctx->ref_defs[i]; + void* bucket; + MD_REF_DEF_LIST* list; + + def->hash = md_link_label_hash(def->label, def->label_size); + bucket = ctx->ref_def_hashtable[def->hash % ctx->ref_def_hashtable_size]; + + if(bucket == NULL) { + /* The bucket is empty. Make it just point to the def. */ + ctx->ref_def_hashtable[def->hash % ctx->ref_def_hashtable_size] = def; + continue; + } + + if(ctx->ref_defs <= (MD_REF_DEF*) bucket && (MD_REF_DEF*) bucket < ctx->ref_defs + ctx->n_ref_defs) { + /* The bucket already contains one ref. def. Lets see whether it + * is the same label (ref. def. duplicate) or different one + * (hash conflict). */ + MD_REF_DEF* old_def = (MD_REF_DEF*) bucket; + + if(md_link_label_cmp(def->label, def->label_size, old_def->label, old_def->label_size) == 0) { + /* Duplicate label: Ignore this ref. def. */ + continue; + } + + /* Make the bucket complex, i.e. able to hold more ref. defs. */ + list = (MD_REF_DEF_LIST*) malloc(sizeof(MD_REF_DEF_LIST) + 2 * sizeof(MD_REF_DEF*)); + if(list == NULL) { + MD_LOG("malloc() failed."); + goto abort; + } + list->ref_defs[0] = old_def; + list->ref_defs[1] = def; + list->n_ref_defs = 2; + list->alloc_ref_defs = 2; + ctx->ref_def_hashtable[def->hash % ctx->ref_def_hashtable_size] = list; + continue; + } + + /* Append the def to the complex bucket list. + * + * Note in this case we ignore potential duplicates to avoid expensive + * iterating over the complex bucket. Below, we revisit all the complex + * buckets and handle it more cheaply after the complex bucket contents + * is sorted. */ + list = (MD_REF_DEF_LIST*) bucket; + if(list->n_ref_defs >= list->alloc_ref_defs) { + int alloc_ref_defs = list->alloc_ref_defs + list->alloc_ref_defs / 2; + MD_REF_DEF_LIST* list_tmp = (MD_REF_DEF_LIST*) realloc(list, + sizeof(MD_REF_DEF_LIST) + alloc_ref_defs * sizeof(MD_REF_DEF*)); + if(list_tmp == NULL) { + MD_LOG("realloc() failed."); + goto abort; + } + list = list_tmp; + list->alloc_ref_defs = alloc_ref_defs; + ctx->ref_def_hashtable[def->hash % ctx->ref_def_hashtable_size] = list; + } + + list->ref_defs[list->n_ref_defs] = def; + list->n_ref_defs++; + } + + /* Sort the complex buckets so we can use bsearch() with them. */ + for(i = 0; i < ctx->ref_def_hashtable_size; i++) { + void* bucket = ctx->ref_def_hashtable[i]; + MD_REF_DEF_LIST* list; + + if(bucket == NULL) + continue; + if(ctx->ref_defs <= (MD_REF_DEF*) bucket && (MD_REF_DEF*) bucket < ctx->ref_defs + ctx->n_ref_defs) + continue; + + list = (MD_REF_DEF_LIST*) bucket; + qsort(list->ref_defs, list->n_ref_defs, sizeof(MD_REF_DEF*), md_ref_def_cmp_for_sort); + + /* Disable all duplicates in the complex bucket by forcing all such + * records to point to the 1st such ref. def. I.e. no matter which + * record is found during the lookup, it will always point to the right + * ref. def. in ctx->ref_defs[]. */ + for(j = 1; j < list->n_ref_defs; j++) { + if(md_ref_def_cmp(&list->ref_defs[j-1], &list->ref_defs[j]) == 0) + list->ref_defs[j] = list->ref_defs[j-1]; + } + } + + return 0; + +abort: + return -1; +} + +static void +md_free_ref_def_hashtable(MD_CTX* ctx) +{ + if(ctx->ref_def_hashtable != NULL) { + int i; + + for(i = 0; i < ctx->ref_def_hashtable_size; i++) { + void* bucket = ctx->ref_def_hashtable[i]; + if(bucket == NULL) + continue; + if(ctx->ref_defs <= (MD_REF_DEF*) bucket && (MD_REF_DEF*) bucket < ctx->ref_defs + ctx->n_ref_defs) + continue; + free(bucket); + } + + free(ctx->ref_def_hashtable); + } +} + +static const MD_REF_DEF* +md_lookup_ref_def(MD_CTX* ctx, const CHAR* label, SZ label_size) +{ + unsigned hash; + void* bucket; + + if(ctx->ref_def_hashtable_size == 0) + return NULL; + + hash = md_link_label_hash(label, label_size); + bucket = ctx->ref_def_hashtable[hash % ctx->ref_def_hashtable_size]; + + if(bucket == NULL) { + return NULL; + } else if(ctx->ref_defs <= (MD_REF_DEF*) bucket && (MD_REF_DEF*) bucket < ctx->ref_defs + ctx->n_ref_defs) { + const MD_REF_DEF* def = (MD_REF_DEF*) bucket; + + if(md_link_label_cmp(def->label, def->label_size, label, label_size) == 0) + return def; + else + return NULL; + } else { + MD_REF_DEF_LIST* list = (MD_REF_DEF_LIST*) bucket; + MD_REF_DEF key_buf; + const MD_REF_DEF* key = &key_buf; + const MD_REF_DEF** ret; + + key_buf.label = (CHAR*) label; + key_buf.label_size = label_size; + key_buf.hash = md_link_label_hash(key_buf.label, key_buf.label_size); + + ret = (const MD_REF_DEF**) bsearch(&key, list->ref_defs, + list->n_ref_defs, sizeof(MD_REF_DEF*), md_ref_def_cmp); + if(ret != NULL) + return *ret; + else + return NULL; + } +} + + +/*************************** + *** Recognizing Links *** + ***************************/ + +/* Note this code is partially shared between processing inlines and blocks + * as reference definitions and links share some helper parser functions. + */ + +typedef struct MD_LINK_ATTR_tag MD_LINK_ATTR; +struct MD_LINK_ATTR_tag { + OFF dest_beg; + OFF dest_end; + + CHAR* title; + SZ title_size; + int title_needs_free; +}; + + +static int +md_is_link_label(MD_CTX* ctx, const MD_LINE* lines, int n_lines, OFF beg, + OFF* p_end, int* p_beg_line_index, int* p_end_line_index, + OFF* p_contents_beg, OFF* p_contents_end) +{ + OFF off = beg; + OFF contents_beg = 0; + OFF contents_end = 0; + int line_index = 0; + int len = 0; + + if(CH(off) != _T('[')) + return FALSE; + off++; + + while(1) { + OFF line_end = lines[line_index].end; + + while(off < line_end) { + if(CH(off) == _T('\\') && off+1 < ctx->size && (ISPUNCT(off+1) || ISNEWLINE(off+1))) { + if(contents_end == 0) { + contents_beg = off; + *p_beg_line_index = line_index; + } + contents_end = off + 2; + off += 2; + } else if(CH(off) == _T('[')) { + return FALSE; + } else if(CH(off) == _T(']')) { + if(contents_beg < contents_end) { + /* Success. */ + *p_contents_beg = contents_beg; + *p_contents_end = contents_end; + *p_end = off+1; + *p_end_line_index = line_index; + return TRUE; + } else { + /* Link label must have some non-whitespace contents. */ + return FALSE; + } + } else { + unsigned codepoint; + SZ char_size; + + codepoint = md_decode_unicode(ctx->text, off, ctx->size, &char_size); + if(!ISUNICODEWHITESPACE_(codepoint)) { + if(contents_end == 0) { + contents_beg = off; + *p_beg_line_index = line_index; + } + contents_end = off + char_size; + } + + off += char_size; + } + + len++; + if(len > 999) + return FALSE; + } + + line_index++; + len++; + if(line_index < n_lines) + off = lines[line_index].beg; + else + break; + } + + return FALSE; +} + +static int +md_is_link_destination_A(MD_CTX* ctx, OFF beg, OFF max_end, OFF* p_end, + OFF* p_contents_beg, OFF* p_contents_end) +{ + OFF off = beg; + + if(off >= max_end || CH(off) != _T('<')) + return FALSE; + off++; + + while(off < max_end) { + if(CH(off) == _T('\\') && off+1 < max_end && ISPUNCT(off+1)) { + off += 2; + continue; + } + + if(ISNEWLINE(off) || CH(off) == _T('<')) + return FALSE; + + if(CH(off) == _T('>')) { + /* Success. */ + *p_contents_beg = beg+1; + *p_contents_end = off; + *p_end = off+1; + return TRUE; + } + + off++; + } + + return FALSE; +} + +static int +md_is_link_destination_B(MD_CTX* ctx, OFF beg, OFF max_end, OFF* p_end, + OFF* p_contents_beg, OFF* p_contents_end) +{ + OFF off = beg; + int parenthesis_level = 0; + + while(off < max_end) { + if(CH(off) == _T('\\') && off+1 < max_end && ISPUNCT(off+1)) { + off += 2; + continue; + } + + if(ISWHITESPACE(off) || ISCNTRL(off)) + break; + + /* Link destination may include balanced pairs of unescaped '(' ')'. + * Note we limit the maximal nesting level by 32 to protect us from + * https://github.com/jgm/cmark/issues/214 */ + if(CH(off) == _T('(')) { + parenthesis_level++; + if(parenthesis_level > 32) + return FALSE; + } else if(CH(off) == _T(')')) { + if(parenthesis_level == 0) + break; + parenthesis_level--; + } + + off++; + } + + if(parenthesis_level != 0 || off == beg) + return FALSE; + + /* Success. */ + *p_contents_beg = beg; + *p_contents_end = off; + *p_end = off; + return TRUE; +} + +static inline int +md_is_link_destination(MD_CTX* ctx, OFF beg, OFF max_end, OFF* p_end, + OFF* p_contents_beg, OFF* p_contents_end) +{ + if(CH(beg) == _T('<')) + return md_is_link_destination_A(ctx, beg, max_end, p_end, p_contents_beg, p_contents_end); + else + return md_is_link_destination_B(ctx, beg, max_end, p_end, p_contents_beg, p_contents_end); +} + +static int +md_is_link_title(MD_CTX* ctx, const MD_LINE* lines, int n_lines, OFF beg, + OFF* p_end, int* p_beg_line_index, int* p_end_line_index, + OFF* p_contents_beg, OFF* p_contents_end) +{ + OFF off = beg; + CHAR closer_char; + int line_index = 0; + + /* White space with up to one line break. */ + while(off < lines[line_index].end && ISWHITESPACE(off)) + off++; + if(off >= lines[line_index].end) { + line_index++; + if(line_index >= n_lines) + return FALSE; + off = lines[line_index].beg; + } + if(off == beg) + return FALSE; + + *p_beg_line_index = line_index; + + /* First char determines how to detect end of it. */ + switch(CH(off)) { + case _T('"'): closer_char = _T('"'); break; + case _T('\''): closer_char = _T('\''); break; + case _T('('): closer_char = _T(')'); break; + default: return FALSE; + } + off++; + + *p_contents_beg = off; + + while(line_index < n_lines) { + OFF line_end = lines[line_index].end; + + while(off < line_end) { + if(CH(off) == _T('\\') && off+1 < ctx->size && (ISPUNCT(off+1) || ISNEWLINE(off+1))) { + off++; + } else if(CH(off) == closer_char) { + /* Success. */ + *p_contents_end = off; + *p_end = off+1; + *p_end_line_index = line_index; + return TRUE; + } else if(closer_char == _T(')') && CH(off) == _T('(')) { + /* ()-style title cannot contain (unescaped '(')) */ + return FALSE; + } + + off++; + } + + line_index++; + } + + return FALSE; +} + +/* Returns 0 if it is not a reference definition. + * + * Returns N > 0 if it is a reference definition. N then corresponds to the + * number of lines forming it). In this case the definition is stored for + * resolving any links referring to it. + * + * Returns -1 in case of an error (out of memory). + */ +static int +md_is_link_reference_definition(MD_CTX* ctx, const MD_LINE* lines, int n_lines) +{ + OFF label_contents_beg; + OFF label_contents_end; + int label_contents_line_index = -1; + int label_is_multiline = FALSE; + OFF dest_contents_beg; + OFF dest_contents_end; + OFF title_contents_beg; + OFF title_contents_end; + int title_contents_line_index; + int title_is_multiline = FALSE; + OFF off; + int line_index = 0; + int tmp_line_index; + MD_REF_DEF* def = NULL; + int ret = 0; + + /* Link label. */ + if(!md_is_link_label(ctx, lines, n_lines, lines[0].beg, + &off, &label_contents_line_index, &line_index, + &label_contents_beg, &label_contents_end)) + return FALSE; + label_is_multiline = (label_contents_line_index != line_index); + + /* Colon. */ + if(off >= lines[line_index].end || CH(off) != _T(':')) + return FALSE; + off++; + + /* Optional white space with up to one line break. */ + while(off < lines[line_index].end && ISWHITESPACE(off)) + off++; + if(off >= lines[line_index].end) { + line_index++; + if(line_index >= n_lines) + return FALSE; + off = lines[line_index].beg; + } + + /* Link destination. */ + if(!md_is_link_destination(ctx, off, lines[line_index].end, + &off, &dest_contents_beg, &dest_contents_end)) + return FALSE; + + /* (Optional) title. Note we interpret it as an title only if nothing + * more follows on its last line. */ + if(md_is_link_title(ctx, lines + line_index, n_lines - line_index, off, + &off, &title_contents_line_index, &tmp_line_index, + &title_contents_beg, &title_contents_end) + && off >= lines[line_index + tmp_line_index].end) + { + title_is_multiline = (tmp_line_index != title_contents_line_index); + title_contents_line_index += line_index; + line_index += tmp_line_index; + } else { + /* Not a title. */ + title_is_multiline = FALSE; + title_contents_beg = off; + title_contents_end = off; + title_contents_line_index = 0; + } + + /* Nothing more can follow on the last line. */ + if(off < lines[line_index].end) + return FALSE; + + /* So, it _is_ a reference definition. Remember it. */ + if(ctx->n_ref_defs >= ctx->alloc_ref_defs) { + MD_REF_DEF* new_defs; + + ctx->alloc_ref_defs = (ctx->alloc_ref_defs > 0 + ? ctx->alloc_ref_defs + ctx->alloc_ref_defs / 2 + : 16); + new_defs = (MD_REF_DEF*) realloc(ctx->ref_defs, ctx->alloc_ref_defs * sizeof(MD_REF_DEF)); + if(new_defs == NULL) { + MD_LOG("realloc() failed."); + goto abort; + } + + ctx->ref_defs = new_defs; + } + def = &ctx->ref_defs[ctx->n_ref_defs]; + memset(def, 0, sizeof(MD_REF_DEF)); + + if(label_is_multiline) { + MD_CHECK(md_merge_lines_alloc(ctx, label_contents_beg, label_contents_end, + lines + label_contents_line_index, n_lines - label_contents_line_index, + _T(' '), &def->label, &def->label_size)); + def->label_needs_free = TRUE; + } else { + def->label = (CHAR*) STR(label_contents_beg); + def->label_size = label_contents_end - label_contents_beg; + } + + if(title_is_multiline) { + MD_CHECK(md_merge_lines_alloc(ctx, title_contents_beg, title_contents_end, + lines + title_contents_line_index, n_lines - title_contents_line_index, + _T('\n'), &def->title, &def->title_size)); + def->title_needs_free = TRUE; + } else { + def->title = (CHAR*) STR(title_contents_beg); + def->title_size = title_contents_end - title_contents_beg; + } + + def->dest_beg = dest_contents_beg; + def->dest_end = dest_contents_end; + + /* Success. */ + ctx->n_ref_defs++; + return line_index + 1; + +abort: + /* Failure. */ + if(def != NULL && def->label_needs_free) + free(def->label); + if(def != NULL && def->title_needs_free) + free(def->title); + return ret; +} + +static int +md_is_link_reference(MD_CTX* ctx, const MD_LINE* lines, int n_lines, + OFF beg, OFF end, MD_LINK_ATTR* attr) +{ + const MD_REF_DEF* def; + const MD_LINE* beg_line; + int is_multiline; + CHAR* label; + SZ label_size; + int ret; + + MD_ASSERT(CH(beg) == _T('[') || CH(beg) == _T('!')); + MD_ASSERT(CH(end-1) == _T(']')); + + beg += (CH(beg) == _T('!') ? 2 : 1); + end--; + + /* Find lines corresponding to the beg and end positions. */ + beg_line = md_lookup_line(beg, lines, n_lines); + is_multiline = (end > beg_line->end); + + if(is_multiline) { + MD_CHECK(md_merge_lines_alloc(ctx, beg, end, beg_line, + (int)(n_lines - (beg_line - lines)), _T(' '), &label, &label_size)); + } else { + label = (CHAR*) STR(beg); + label_size = end - beg; + } + + def = md_lookup_ref_def(ctx, label, label_size); + if(def != NULL) { + attr->dest_beg = def->dest_beg; + attr->dest_end = def->dest_end; + attr->title = def->title; + attr->title_size = def->title_size; + attr->title_needs_free = FALSE; + } + + if(is_multiline) + free(label); + + ret = (def != NULL); + +abort: + return ret; +} + +static int +md_is_inline_link_spec(MD_CTX* ctx, const MD_LINE* lines, int n_lines, + OFF beg, OFF* p_end, MD_LINK_ATTR* attr) +{ + int line_index = 0; + int tmp_line_index; + OFF title_contents_beg; + OFF title_contents_end; + int title_contents_line_index; + int title_is_multiline; + OFF off = beg; + int ret = FALSE; + + while(off >= lines[line_index].end) + line_index++; + + MD_ASSERT(CH(off) == _T('(')); + off++; + + /* Optional white space with up to one line break. */ + while(off < lines[line_index].end && ISWHITESPACE(off)) + off++; + if(off >= lines[line_index].end && (off >= ctx->size || ISNEWLINE(off))) { + line_index++; + if(line_index >= n_lines) + return FALSE; + off = lines[line_index].beg; + } + + /* Link destination may be omitted, but only when not also having a title. */ + if(off < ctx->size && CH(off) == _T(')')) { + attr->dest_beg = off; + attr->dest_end = off; + attr->title = NULL; + attr->title_size = 0; + attr->title_needs_free = FALSE; + off++; + *p_end = off; + return TRUE; + } + + /* Link destination. */ + if(!md_is_link_destination(ctx, off, lines[line_index].end, + &off, &attr->dest_beg, &attr->dest_end)) + return FALSE; + + /* (Optional) title. */ + if(md_is_link_title(ctx, lines + line_index, n_lines - line_index, off, + &off, &title_contents_line_index, &tmp_line_index, + &title_contents_beg, &title_contents_end)) + { + title_is_multiline = (tmp_line_index != title_contents_line_index); + title_contents_line_index += line_index; + line_index += tmp_line_index; + } else { + /* Not a title. */ + title_is_multiline = FALSE; + title_contents_beg = off; + title_contents_end = off; + title_contents_line_index = 0; + } + + /* Optional whitespace followed with final ')'. */ + while(off < lines[line_index].end && ISWHITESPACE(off)) + off++; + if (off >= lines[line_index].end && (off >= ctx->size || ISNEWLINE(off))) { + line_index++; + if(line_index >= n_lines) + return FALSE; + off = lines[line_index].beg; + } + if(CH(off) != _T(')')) + goto abort; + off++; + + if(title_contents_beg >= title_contents_end) { + attr->title = NULL; + attr->title_size = 0; + attr->title_needs_free = FALSE; + } else if(!title_is_multiline) { + attr->title = (CHAR*) STR(title_contents_beg); + attr->title_size = title_contents_end - title_contents_beg; + attr->title_needs_free = FALSE; + } else { + MD_CHECK(md_merge_lines_alloc(ctx, title_contents_beg, title_contents_end, + lines + title_contents_line_index, n_lines - title_contents_line_index, + _T('\n'), &attr->title, &attr->title_size)); + attr->title_needs_free = TRUE; + } + + *p_end = off; + ret = TRUE; + +abort: + return ret; +} + +static void +md_free_ref_defs(MD_CTX* ctx) +{ + int i; + + for(i = 0; i < ctx->n_ref_defs; i++) { + MD_REF_DEF* def = &ctx->ref_defs[i]; + + if(def->label_needs_free) + free(def->label); + if(def->title_needs_free) + free(def->title); + } + + free(ctx->ref_defs); +} + + +/****************************************** + *** Processing Inlines (a.k.a Spans) *** + ******************************************/ + +/* We process inlines in few phases: + * + * (1) We go through the block text and collect all significant characters + * which may start/end a span or some other significant position into + * ctx->marks[]. Core of this is what md_collect_marks() does. + * + * We also do some very brief preliminary context-less analysis, whether + * it might be opener or closer (e.g. of an emphasis span). + * + * This speeds the other steps as we do not need to re-iterate over all + * characters anymore. + * + * (2) We analyze each potential mark types, in order by their precedence. + * + * In each md_analyze_XXX() function, we re-iterate list of the marks, + * skipping already resolved regions (in preceding precedences) and try to + * resolve them. + * + * (2.1) For trivial marks, which are single (e.g. HTML entity), we just mark + * them as resolved. + * + * (2.2) For range-type marks, we analyze whether the mark could be closer + * and, if yes, whether there is some preceding opener it could satisfy. + * + * If not we check whether it could be really an opener and if yes, we + * remember it so subsequent closers may resolve it. + * + * (3) Finally, when all marks were analyzed, we render the block contents + * by calling MD_RENDERER::text() callback, interrupting by ::enter_span() + * or ::close_span() whenever we reach a resolved mark. + */ + + +/* The mark structure. + * + * '\\': Maybe escape sequence. + * '\0': NULL char. + * '*': Maybe (strong) emphasis start/end. + * '_': Maybe (strong) emphasis start/end. + * '~': Maybe strikethrough start/end (needs MD_FLAG_STRIKETHROUGH). + * '`': Maybe code span start/end. + * '&': Maybe start of entity. + * ';': Maybe end of entity. + * '<': Maybe start of raw HTML or autolink. + * '>': Maybe end of raw HTML or autolink. + * '[': Maybe start of link label or link text. + * '!': Equivalent of '[' for image. + * ']': Maybe end of link label or link text. + * '@': Maybe permissive e-mail auto-link (needs MD_FLAG_PERMISSIVEEMAILAUTOLINKS). + * ':': Maybe permissive URL auto-link (needs MD_FLAG_PERMISSIVEURLAUTOLINKS). + * '.': Maybe permissive WWW auto-link (needs MD_FLAG_PERMISSIVEWWWAUTOLINKS). + * 'D': Dummy mark, it reserves a space for splitting a previous mark + * (e.g. emphasis) or to make more space for storing some special data + * related to the preceding mark (e.g. link). + * + * Note that not all instances of these chars in the text imply creation of the + * structure. Only those which have (or may have, after we see more context) + * the special meaning. + * + * (Keep this struct as small as possible to fit as much of them into CPU + * cache line.) + */ +struct MD_MARK_tag { + OFF beg; + OFF end; + + /* For unresolved openers, 'prev' and 'next' form the chain of open openers + * of given type 'ch'. + * + * During resolving, we disconnect from the chain and point to the + * corresponding counterpart so opener points to its closer and vice versa. + */ + int prev; + int next; + CHAR ch; + unsigned char flags; +}; + +/* Mark flags (these apply to ALL mark types). */ +#define MD_MARK_POTENTIAL_OPENER 0x01 /* Maybe opener. */ +#define MD_MARK_POTENTIAL_CLOSER 0x02 /* Maybe closer. */ +#define MD_MARK_OPENER 0x04 /* Definitely opener. */ +#define MD_MARK_CLOSER 0x08 /* Definitely closer. */ +#define MD_MARK_RESOLVED 0x10 /* Resolved in any definite way. */ + +/* Mark flags specific for various mark types (so they can share bits). */ +#define MD_MARK_EMPH_INTRAWORD 0x20 /* Helper for the "rule of 3". */ +#define MD_MARK_EMPH_MOD3_0 0x40 +#define MD_MARK_EMPH_MOD3_1 0x80 +#define MD_MARK_EMPH_MOD3_2 (0x40 | 0x80) +#define MD_MARK_EMPH_MOD3_MASK (0x40 | 0x80) +#define MD_MARK_AUTOLINK 0x20 /* Distinguisher for '<', '>'. */ +#define MD_MARK_VALIDPERMISSIVEAUTOLINK 0x20 /* For permissive autolinks. */ +#define MD_MARK_HASNESTEDBRACKETS 0x20 /* For '[' to rule out invalid link labels early */ + +static MD_MARKCHAIN* +md_asterisk_chain(MD_CTX* ctx, unsigned flags) +{ + switch(flags & (MD_MARK_EMPH_INTRAWORD | MD_MARK_EMPH_MOD3_MASK)) { + case MD_MARK_EMPH_INTRAWORD | MD_MARK_EMPH_MOD3_0: return &ASTERISK_OPENERS_intraword_mod3_0; + case MD_MARK_EMPH_INTRAWORD | MD_MARK_EMPH_MOD3_1: return &ASTERISK_OPENERS_intraword_mod3_1; + case MD_MARK_EMPH_INTRAWORD | MD_MARK_EMPH_MOD3_2: return &ASTERISK_OPENERS_intraword_mod3_2; + case MD_MARK_EMPH_MOD3_0: return &ASTERISK_OPENERS_extraword_mod3_0; + case MD_MARK_EMPH_MOD3_1: return &ASTERISK_OPENERS_extraword_mod3_1; + case MD_MARK_EMPH_MOD3_2: return &ASTERISK_OPENERS_extraword_mod3_2; + default: MD_UNREACHABLE(); + } + return NULL; +} + +static MD_MARKCHAIN* +md_mark_chain(MD_CTX* ctx, int mark_index) +{ + MD_MARK* mark = &ctx->marks[mark_index]; + + switch(mark->ch) { + case _T('*'): return md_asterisk_chain(ctx, mark->flags); + case _T('_'): return &UNDERSCORE_OPENERS; + case _T('~'): return (mark->end - mark->beg == 1) ? &TILDE_OPENERS_1 : &TILDE_OPENERS_2; + case _T('!'): MD_FALLTHROUGH(); + case _T('['): return &BRACKET_OPENERS; + case _T('|'): return &TABLECELLBOUNDARIES; + default: return NULL; + } +} + +static MD_MARK* +md_push_mark(MD_CTX* ctx) +{ + if(ctx->n_marks >= ctx->alloc_marks) { + MD_MARK* new_marks; + + ctx->alloc_marks = (ctx->alloc_marks > 0 + ? ctx->alloc_marks + ctx->alloc_marks / 2 + : 64); + new_marks = realloc(ctx->marks, ctx->alloc_marks * sizeof(MD_MARK)); + if(new_marks == NULL) { + MD_LOG("realloc() failed."); + return NULL; + } + + ctx->marks = new_marks; + } + + return &ctx->marks[ctx->n_marks++]; +} + +#define PUSH_MARK_() \ + do { \ + mark = md_push_mark(ctx); \ + if(mark == NULL) { \ + ret = -1; \ + goto abort; \ + } \ + } while(0) + +#define PUSH_MARK(ch_, beg_, end_, flags_) \ + do { \ + PUSH_MARK_(); \ + mark->beg = (beg_); \ + mark->end = (end_); \ + mark->prev = -1; \ + mark->next = -1; \ + mark->ch = (char)(ch_); \ + mark->flags = (flags_); \ + } while(0) + + +static void +md_mark_chain_append(MD_CTX* ctx, MD_MARKCHAIN* chain, int mark_index) +{ + if(chain->tail >= 0) + ctx->marks[chain->tail].next = mark_index; + else + chain->head = mark_index; + + ctx->marks[mark_index].prev = chain->tail; + ctx->marks[mark_index].next = -1; + chain->tail = mark_index; +} + +/* Sometimes, we need to store a pointer into the mark. It is quite rare + * so we do not bother to make MD_MARK use union, and it can only happen + * for dummy marks. */ +static inline void +md_mark_store_ptr(MD_CTX* ctx, int mark_index, void* ptr) +{ + MD_MARK* mark = &ctx->marks[mark_index]; + MD_ASSERT(mark->ch == 'D'); + + /* Check only members beg and end are misused for this. */ + MD_ASSERT(sizeof(void*) <= 2 * sizeof(OFF)); + memcpy(mark, &ptr, sizeof(void*)); +} + +static inline void* +md_mark_get_ptr(MD_CTX* ctx, int mark_index) +{ + void* ptr; + MD_MARK* mark = &ctx->marks[mark_index]; + MD_ASSERT(mark->ch == 'D'); + memcpy(&ptr, mark, sizeof(void*)); + return ptr; +} + +static void +md_resolve_range(MD_CTX* ctx, MD_MARKCHAIN* chain, int opener_index, int closer_index) +{ + MD_MARK* opener = &ctx->marks[opener_index]; + MD_MARK* closer = &ctx->marks[closer_index]; + + /* Remove opener from the list of openers. */ + if(chain != NULL) { + if(opener->prev >= 0) + ctx->marks[opener->prev].next = opener->next; + else + chain->head = opener->next; + + if(opener->next >= 0) + ctx->marks[opener->next].prev = opener->prev; + else + chain->tail = opener->prev; + } + + /* Interconnect opener and closer and mark both as resolved. */ + opener->next = closer_index; + opener->flags |= MD_MARK_OPENER | MD_MARK_RESOLVED; + closer->prev = opener_index; + closer->flags |= MD_MARK_CLOSER | MD_MARK_RESOLVED; +} + + +#define MD_ROLLBACK_ALL 0 +#define MD_ROLLBACK_CROSSING 1 + +/* In the range ctx->marks[opener_index] ... [closer_index], undo some or all + * resolvings accordingly to these rules: + * + * (1) All openers BEFORE the range corresponding to any closer inside the + * range are un-resolved and they are re-added to their respective chains + * of unresolved openers. This ensures we can reuse the opener for closers + * AFTER the range. + * + * (2) If 'how' is MD_ROLLBACK_ALL, then ALL resolved marks inside the range + * are discarded. + * + * (3) If 'how' is MD_ROLLBACK_CROSSING, only closers with openers handled + * in (1) are discarded. I.e. pairs of openers and closers which are both + * inside the range are retained as well as any unpaired marks. + */ +static void +md_rollback(MD_CTX* ctx, int opener_index, int closer_index, int how) +{ + int i; + int mark_index; + + /* Cut all unresolved openers at the mark index. */ + for(i = OPENERS_CHAIN_FIRST; i < OPENERS_CHAIN_LAST+1; i++) { + MD_MARKCHAIN* chain = &ctx->mark_chains[i]; + + while(chain->tail >= opener_index) { + int same = chain->tail == opener_index; + chain->tail = ctx->marks[chain->tail].prev; + if (same) break; + } + + if(chain->tail >= 0) + ctx->marks[chain->tail].next = -1; + else + chain->head = -1; + } + + /* Go backwards so that unresolved openers are re-added into their + * respective chains, in the right order. */ + mark_index = closer_index - 1; + while(mark_index > opener_index) { + MD_MARK* mark = &ctx->marks[mark_index]; + int mark_flags = mark->flags; + int discard_flag = (how == MD_ROLLBACK_ALL); + + if(mark->flags & MD_MARK_CLOSER) { + int mark_opener_index = mark->prev; + + /* Undo opener BEFORE the range. */ + if(mark_opener_index < opener_index) { + MD_MARK* mark_opener = &ctx->marks[mark_opener_index]; + MD_MARKCHAIN* chain; + + mark_opener->flags &= ~(MD_MARK_OPENER | MD_MARK_CLOSER | MD_MARK_RESOLVED); + chain = md_mark_chain(ctx, opener_index); + if(chain != NULL) { + md_mark_chain_append(ctx, chain, mark_opener_index); + discard_flag = 1; + } + } + } + + /* And reset our flags. */ + if(discard_flag) { + /* Make zero-length closer a dummy mark as that's how it was born */ + if((mark->flags & MD_MARK_CLOSER) && mark->beg == mark->end) + mark->ch = 'D'; + + mark->flags &= ~(MD_MARK_OPENER | MD_MARK_CLOSER | MD_MARK_RESOLVED); + } + + /* Jump as far as we can over unresolved or non-interesting marks. */ + switch(how) { + case MD_ROLLBACK_CROSSING: + if((mark_flags & MD_MARK_CLOSER) && mark->prev > opener_index) { + /* If we are closer with opener INSIDE the range, there may + * not be any other crosser inside the subrange. */ + mark_index = mark->prev; + break; + } + MD_FALLTHROUGH(); + default: + mark_index--; + break; + } + } +} + +static void +md_build_mark_char_map(MD_CTX* ctx) +{ + memset(ctx->mark_char_map, 0, sizeof(ctx->mark_char_map)); + + ctx->mark_char_map['\\'] = 1; + ctx->mark_char_map['*'] = 1; + ctx->mark_char_map['_'] = 1; + ctx->mark_char_map['`'] = 1; + ctx->mark_char_map['&'] = 1; + ctx->mark_char_map[';'] = 1; + ctx->mark_char_map['<'] = 1; + ctx->mark_char_map['>'] = 1; + ctx->mark_char_map['['] = 1; + ctx->mark_char_map['!'] = 1; + ctx->mark_char_map[']'] = 1; + ctx->mark_char_map['\0'] = 1; + + if(ctx->parser.flags & MD_FLAG_STRIKETHROUGH) + ctx->mark_char_map['~'] = 1; + + if(ctx->parser.flags & MD_FLAG_LATEXMATHSPANS) + ctx->mark_char_map['$'] = 1; + + if(ctx->parser.flags & MD_FLAG_PERMISSIVEEMAILAUTOLINKS) + ctx->mark_char_map['@'] = 1; + + if(ctx->parser.flags & MD_FLAG_PERMISSIVEURLAUTOLINKS) + ctx->mark_char_map[':'] = 1; + + if(ctx->parser.flags & MD_FLAG_PERMISSIVEWWWAUTOLINKS) + ctx->mark_char_map['.'] = 1; + + if((ctx->parser.flags & MD_FLAG_TABLES) || (ctx->parser.flags & MD_FLAG_WIKILINKS)) + ctx->mark_char_map['|'] = 1; + + if(ctx->parser.flags & MD_FLAG_COLLAPSEWHITESPACE) { + int i; + + for(i = 0; i < (int) sizeof(ctx->mark_char_map); i++) { + if(ISWHITESPACE_(i)) + ctx->mark_char_map[i] = 1; + } + } +} + +/* We limit code span marks to lower than 32 backticks. This solves the + * pathologic case of too many openers, each of different length: Their + * resolving would be then O(n^2). */ +#define CODESPAN_MARK_MAXLEN 32 + +static int +md_is_code_span(MD_CTX* ctx, const MD_LINE* lines, int n_lines, OFF beg, + OFF* p_opener_beg, OFF* p_opener_end, + OFF* p_closer_beg, OFF* p_closer_end, + OFF last_potential_closers[CODESPAN_MARK_MAXLEN], + int* p_reached_paragraph_end) +{ + OFF opener_beg = beg; + OFF opener_end; + OFF closer_beg; + OFF closer_end; + SZ mark_len; + OFF line_end; + int has_space_after_opener = FALSE; + int has_eol_after_opener = FALSE; + int has_space_before_closer = FALSE; + int has_eol_before_closer = FALSE; + int has_only_space = TRUE; + int line_index = 0; + + line_end = lines[0].end; + opener_end = opener_beg; + while(opener_end < line_end && CH(opener_end) == _T('`')) + opener_end++; + has_space_after_opener = (opener_end < line_end && CH(opener_end) == _T(' ')); + has_eol_after_opener = (opener_end == line_end); + + /* The caller needs to know end of the opening mark even if we fail. */ + *p_opener_end = opener_end; + + mark_len = opener_end - opener_beg; + if(mark_len > CODESPAN_MARK_MAXLEN) + return FALSE; + + /* Check whether we already know there is no closer of this length. + * If so, re-scan does no sense. This fixes issue #59. */ + if(last_potential_closers[mark_len-1] >= lines[n_lines-1].end || + (*p_reached_paragraph_end && last_potential_closers[mark_len-1] < opener_end)) + return FALSE; + + closer_beg = opener_end; + closer_end = opener_end; + + /* Find closer mark. */ + while(TRUE) { + while(closer_beg < line_end && CH(closer_beg) != _T('`')) { + if(CH(closer_beg) != _T(' ')) + has_only_space = FALSE; + closer_beg++; + } + closer_end = closer_beg; + while(closer_end < line_end && CH(closer_end) == _T('`')) + closer_end++; + + if(closer_end - closer_beg == mark_len) { + /* Success. */ + has_space_before_closer = (closer_beg > lines[line_index].beg && CH(closer_beg-1) == _T(' ')); + has_eol_before_closer = (closer_beg == lines[line_index].beg); + break; + } + + if(closer_end - closer_beg > 0) { + /* We have found a back-tick which is not part of the closer. */ + has_only_space = FALSE; + + /* But if we eventually fail, remember it as a potential closer + * of its own length for future attempts. This mitigates needs for + * rescans. */ + if(closer_end - closer_beg < CODESPAN_MARK_MAXLEN) { + if(closer_beg > last_potential_closers[closer_end - closer_beg - 1]) + last_potential_closers[closer_end - closer_beg - 1] = closer_beg; + } + } + + if(closer_end >= line_end) { + line_index++; + if(line_index >= n_lines) { + /* Reached end of the paragraph and still nothing. */ + *p_reached_paragraph_end = TRUE; + return FALSE; + } + /* Try on the next line. */ + line_end = lines[line_index].end; + closer_beg = lines[line_index].beg; + } else { + closer_beg = closer_end; + } + } + + /* If there is a space or a new line both after and before the opener + * (and if the code span is not made of spaces only), consume one initial + * and one trailing space as part of the marks. */ + if(!has_only_space && + (has_space_after_opener || has_eol_after_opener) && + (has_space_before_closer || has_eol_before_closer)) + { + if(has_space_after_opener) + opener_end++; + else + opener_end = lines[1].beg; + + if(has_space_before_closer) + closer_beg--; + else { + closer_beg = lines[line_index-1].end; + /* We need to eat the preceding "\r\n" but not any line trailing + * spaces. */ + while(closer_beg < ctx->size && ISBLANK(closer_beg)) + closer_beg++; + } + } + + *p_opener_beg = opener_beg; + *p_opener_end = opener_end; + *p_closer_beg = closer_beg; + *p_closer_end = closer_end; + return TRUE; +} + +static int +md_is_autolink_uri(MD_CTX* ctx, OFF beg, OFF max_end, OFF* p_end) +{ + OFF off = beg+1; + + MD_ASSERT(CH(beg) == _T('<')); + + /* Check for scheme. */ + if(off >= max_end || !ISASCII(off)) + return FALSE; + off++; + while(1) { + if(off >= max_end) + return FALSE; + if(off - beg > 32) + return FALSE; + if(CH(off) == _T(':') && off - beg >= 3) + break; + if(!ISALNUM(off) && CH(off) != _T('+') && CH(off) != _T('-') && CH(off) != _T('.')) + return FALSE; + off++; + } + + /* Check the path after the scheme. */ + while(off < max_end && CH(off) != _T('>')) { + if(ISWHITESPACE(off) || ISCNTRL(off) || CH(off) == _T('<')) + return FALSE; + off++; + } + + if(off >= max_end) + return FALSE; + + MD_ASSERT(CH(off) == _T('>')); + *p_end = off+1; + return TRUE; +} + +static int +md_is_autolink_email(MD_CTX* ctx, OFF beg, OFF max_end, OFF* p_end) +{ + OFF off = beg + 1; + int label_len; + + MD_ASSERT(CH(beg) == _T('<')); + + /* The code should correspond to this regexp: + /^[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+ + @[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])? + (?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/ + */ + + /* Username (before '@'). */ + while(off < max_end && (ISALNUM(off) || ISANYOF(off, _T(".!#$%&'*+/=?^_`{|}~-")))) + off++; + if(off <= beg+1) + return FALSE; + + /* '@' */ + if(off >= max_end || CH(off) != _T('@')) + return FALSE; + off++; + + /* Labels delimited with '.'; each label is sequence of 1 - 63 alnum + * characters or '-', but '-' is not allowed as first or last char. */ + label_len = 0; + while(off < max_end) { + if(ISALNUM(off)) + label_len++; + else if(CH(off) == _T('-') && label_len > 0) + label_len++; + else if(CH(off) == _T('.') && label_len > 0 && CH(off-1) != _T('-')) + label_len = 0; + else + break; + + if(label_len > 63) + return FALSE; + + off++; + } + + if(label_len <= 0 || off >= max_end || CH(off) != _T('>') || CH(off-1) == _T('-')) + return FALSE; + + *p_end = off+1; + return TRUE; +} + +static int +md_is_autolink(MD_CTX* ctx, OFF beg, OFF max_end, OFF* p_end, int* p_missing_mailto) +{ + if(md_is_autolink_uri(ctx, beg, max_end, p_end)) { + *p_missing_mailto = FALSE; + return TRUE; + } + + if(md_is_autolink_email(ctx, beg, max_end, p_end)) { + *p_missing_mailto = TRUE; + return TRUE; + } + + return FALSE; +} + +static int +md_collect_marks(MD_CTX* ctx, const MD_LINE* lines, int n_lines, int table_mode) +{ + const MD_LINE* line_term = lines + n_lines; + const MD_LINE* line; + int ret = 0; + MD_MARK* mark; + OFF codespan_last_potential_closers[CODESPAN_MARK_MAXLEN] = { 0 }; + int codespan_scanned_till_paragraph_end = FALSE; + + for(line = lines; line < line_term; line++) { + OFF off = line->beg; + OFF line_end = line->end; + + while(TRUE) { + CHAR ch; + +#ifdef MD4C_USE_UTF16 + /* For UTF-16, mark_char_map[] covers only ASCII. */ + #define IS_MARK_CHAR(off) ((CH(off) < SIZEOF_ARRAY(ctx->mark_char_map)) && \ + (ctx->mark_char_map[(unsigned char) CH(off)])) +#else + /* For 8-bit encodings, mark_char_map[] covers all 256 elements. */ + #define IS_MARK_CHAR(off) (ctx->mark_char_map[(unsigned char) CH(off)]) +#endif + + /* Optimization: Use some loop unrolling. */ + while(off + 3 < line_end && !IS_MARK_CHAR(off+0) && !IS_MARK_CHAR(off+1) + && !IS_MARK_CHAR(off+2) && !IS_MARK_CHAR(off+3)) + off += 4; + while(off < line_end && !IS_MARK_CHAR(off+0)) + off++; + + if(off >= line_end) + break; + + ch = CH(off); + + /* A backslash escape. + * It can go beyond line->end as it may involve escaped new + * line to form a hard break. */ + if(ch == _T('\\') && off+1 < ctx->size && (ISPUNCT(off+1) || ISNEWLINE(off+1))) { + /* Hard-break cannot be on the last line of the block. */ + if(!ISNEWLINE(off+1) || line+1 < line_term) + PUSH_MARK(ch, off, off+2, MD_MARK_RESOLVED); + off += 2; + continue; + } + + /* A potential (string) emphasis start/end. */ + if(ch == _T('*') || ch == _T('_')) { + OFF tmp = off+1; + int left_level; /* What precedes: 0 = whitespace; 1 = punctuation; 2 = other char. */ + int right_level; /* What follows: 0 = whitespace; 1 = punctuation; 2 = other char. */ + + while(tmp < line_end && CH(tmp) == ch) + tmp++; + + if(off == line->beg || ISUNICODEWHITESPACEBEFORE(off)) + left_level = 0; + else if(ISUNICODEPUNCTBEFORE(off)) + left_level = 1; + else + left_level = 2; + + if(tmp == line_end || ISUNICODEWHITESPACE(tmp)) + right_level = 0; + else if(ISUNICODEPUNCT(tmp)) + right_level = 1; + else + right_level = 2; + + /* Intra-word underscore doesn't have special meaning. */ + if(ch == _T('_') && left_level == 2 && right_level == 2) { + left_level = 0; + right_level = 0; + } + + if(left_level != 0 || right_level != 0) { + unsigned flags = 0; + + if(left_level > 0 && left_level >= right_level) + flags |= MD_MARK_POTENTIAL_CLOSER; + if(right_level > 0 && right_level >= left_level) + flags |= MD_MARK_POTENTIAL_OPENER; + if(left_level == 2 && right_level == 2) + flags |= MD_MARK_EMPH_INTRAWORD; + + /* For "the rule of three" we need to remember the original + * size of the mark (modulo three), before we potentially + * split the mark when being later resolved partially by some + * shorter closer. */ + switch((tmp - off) % 3) { + case 0: flags |= MD_MARK_EMPH_MOD3_0; break; + case 1: flags |= MD_MARK_EMPH_MOD3_1; break; + case 2: flags |= MD_MARK_EMPH_MOD3_2; break; + } + + PUSH_MARK(ch, off, tmp, flags); + + /* During resolving, multiple asterisks may have to be + * split into independent span start/ends. Consider e.g. + * "**foo* bar*". Therefore we push also some empty dummy + * marks to have enough space for that. */ + off++; + while(off < tmp) { + PUSH_MARK('D', off, off, 0); + off++; + } + continue; + } + + off = tmp; + continue; + } + + /* A potential code span start/end. */ + if(ch == _T('`')) { + OFF opener_beg, opener_end; + OFF closer_beg, closer_end; + int is_code_span; + + is_code_span = md_is_code_span(ctx, line, line_term - line, off, + &opener_beg, &opener_end, &closer_beg, &closer_end, + codespan_last_potential_closers, + &codespan_scanned_till_paragraph_end); + if(is_code_span) { + PUSH_MARK(_T('`'), opener_beg, opener_end, MD_MARK_OPENER | MD_MARK_RESOLVED); + PUSH_MARK(_T('`'), closer_beg, closer_end, MD_MARK_CLOSER | MD_MARK_RESOLVED); + ctx->marks[ctx->n_marks-2].next = ctx->n_marks-1; + ctx->marks[ctx->n_marks-1].prev = ctx->n_marks-2; + + off = closer_end; + + /* Advance the current line accordingly. */ + if(off > line_end) { + line = md_lookup_line(off, line, line_term - line); + line_end = line->end; + } + continue; + } + + off = opener_end; + continue; + } + + /* A potential entity start. */ + if(ch == _T('&')) { + PUSH_MARK(ch, off, off+1, MD_MARK_POTENTIAL_OPENER); + off++; + continue; + } + + /* A potential entity end. */ + if(ch == _T(';')) { + /* We surely cannot be entity unless the previous mark is '&'. */ + if(ctx->n_marks > 0 && ctx->marks[ctx->n_marks-1].ch == _T('&')) + PUSH_MARK(ch, off, off+1, MD_MARK_POTENTIAL_CLOSER); + + off++; + continue; + } + + /* A potential autolink or raw HTML start/end. */ + if(ch == _T('<')) { + int is_autolink; + OFF autolink_end; + int missing_mailto; + + if(!(ctx->parser.flags & MD_FLAG_NOHTMLSPANS)) { + int is_html; + OFF html_end; + + /* Given the nature of the raw HTML, we have to recognize + * it here. Doing so later in md_analyze_lt_gt() could + * open can of worms of quadratic complexity. */ + is_html = md_is_html_any(ctx, line, line_term - line, off, + lines[n_lines-1].end, &html_end); + if(is_html) { + PUSH_MARK(_T('<'), off, off, MD_MARK_OPENER | MD_MARK_RESOLVED); + PUSH_MARK(_T('>'), html_end, html_end, MD_MARK_CLOSER | MD_MARK_RESOLVED); + ctx->marks[ctx->n_marks-2].next = ctx->n_marks-1; + ctx->marks[ctx->n_marks-1].prev = ctx->n_marks-2; + off = html_end; + + /* Advance the current line accordingly. */ + if(off > line_end) { + line = md_lookup_line(off, line, line_term - line); + line_end = line->end; + } + continue; + } + } + + is_autolink = md_is_autolink(ctx, off, lines[n_lines-1].end, + &autolink_end, &missing_mailto); + if(is_autolink) { + PUSH_MARK((missing_mailto ? _T('@') : _T('<')), off, off+1, + MD_MARK_OPENER | MD_MARK_RESOLVED | MD_MARK_AUTOLINK); + PUSH_MARK(_T('>'), autolink_end-1, autolink_end, + MD_MARK_CLOSER | MD_MARK_RESOLVED | MD_MARK_AUTOLINK); + ctx->marks[ctx->n_marks-2].next = ctx->n_marks-1; + ctx->marks[ctx->n_marks-1].prev = ctx->n_marks-2; + off = autolink_end; + continue; + } + + off++; + continue; + } + + /* A potential link or its part. */ + if(ch == _T('[') || (ch == _T('!') && off+1 < line_end && CH(off+1) == _T('['))) { + OFF tmp = (ch == _T('[') ? off+1 : off+2); + PUSH_MARK(ch, off, tmp, MD_MARK_POTENTIAL_OPENER); + off = tmp; + /* Two dummies to make enough place for data we need if it is + * a link. */ + PUSH_MARK('D', off, off, 0); + PUSH_MARK('D', off, off, 0); + continue; + } + if(ch == _T(']')) { + PUSH_MARK(ch, off, off+1, MD_MARK_POTENTIAL_CLOSER); + off++; + continue; + } + + /* A potential permissive e-mail autolink. */ + if(ch == _T('@')) { + if(line->beg + 1 <= off && ISALNUM(off-1) && + off + 3 < line->end && ISALNUM(off+1)) + { + PUSH_MARK(ch, off, off+1, MD_MARK_POTENTIAL_OPENER); + /* Push a dummy as a reserve for a closer. */ + PUSH_MARK('D', off, off, 0); + } + + off++; + continue; + } + + /* A potential permissive URL autolink. */ + if(ch == _T(':')) { + static struct { + const CHAR* scheme; + SZ scheme_size; + const CHAR* suffix; + SZ suffix_size; + } scheme_map[] = { + /* In the order from the most frequently used, arguably. */ + { _T("http"), 4, _T("//"), 2 }, + { _T("https"), 5, _T("//"), 2 }, + { _T("ftp"), 3, _T("//"), 2 } + }; + int scheme_index; + + for(scheme_index = 0; scheme_index < (int) SIZEOF_ARRAY(scheme_map); scheme_index++) { + const CHAR* scheme = scheme_map[scheme_index].scheme; + const SZ scheme_size = scheme_map[scheme_index].scheme_size; + const CHAR* suffix = scheme_map[scheme_index].suffix; + const SZ suffix_size = scheme_map[scheme_index].suffix_size; + + if(line->beg + scheme_size <= off && md_ascii_eq(STR(off-scheme_size), scheme, scheme_size) && + (line->beg + scheme_size == off || ISWHITESPACE(off-scheme_size-1) || ISANYOF(off-scheme_size-1, _T("*_~(["))) && + off + 1 + suffix_size < line->end && md_ascii_eq(STR(off+1), suffix, suffix_size)) + { + PUSH_MARK(ch, off-scheme_size, off+1+suffix_size, MD_MARK_POTENTIAL_OPENER); + /* Push a dummy as a reserve for a closer. */ + PUSH_MARK('D', off, off, 0); + off += 1 + suffix_size; + break; + } + } + + off++; + continue; + } + + /* A potential permissive WWW autolink. */ + if(ch == _T('.')) { + if(line->beg + 3 <= off && md_ascii_eq(STR(off-3), _T("www"), 3) && + (line->beg + 3 == off || ISWHITESPACE(off-4) || ISANYOF(off-4, _T("*_~(["))) && + off + 1 < line_end) + { + PUSH_MARK(ch, off-3, off+1, MD_MARK_POTENTIAL_OPENER); + /* Push a dummy as a reserve for a closer. */ + PUSH_MARK('D', off, off, 0); + off++; + continue; + } + + off++; + continue; + } + + /* A potential table cell boundary or wiki link label delimiter. */ + if((table_mode || ctx->parser.flags & MD_FLAG_WIKILINKS) && ch == _T('|')) { + PUSH_MARK(ch, off, off+1, 0); + off++; + continue; + } + + /* A potential strikethrough start/end. */ + if(ch == _T('~')) { + OFF tmp = off+1; + + while(tmp < line_end && CH(tmp) == _T('~')) + tmp++; + + if(tmp - off < 3) { + unsigned flags = 0; + + if(tmp < line_end && !ISUNICODEWHITESPACE(tmp)) + flags |= MD_MARK_POTENTIAL_OPENER; + if(off > line->beg && !ISUNICODEWHITESPACEBEFORE(off)) + flags |= MD_MARK_POTENTIAL_CLOSER; + if(flags != 0) + PUSH_MARK(ch, off, tmp, flags); + } + + off = tmp; + continue; + } + + /* A potential equation start/end */ + if(ch == _T('$')) { + /* We can have at most two consecutive $ signs, + * where two dollar signs signify a display equation. */ + OFF tmp = off+1; + + while(tmp < line_end && CH(tmp) == _T('$')) + tmp++; + + if (tmp - off <= 2) + PUSH_MARK(ch, off, tmp, MD_MARK_POTENTIAL_OPENER | MD_MARK_POTENTIAL_CLOSER); + off = tmp; + continue; + } + + /* Turn non-trivial whitespace into single space. */ + if(ISWHITESPACE_(ch)) { + OFF tmp = off+1; + + while(tmp < line_end && ISWHITESPACE(tmp)) + tmp++; + + if(tmp - off > 1 || ch != _T(' ')) + PUSH_MARK(ch, off, tmp, MD_MARK_RESOLVED); + + off = tmp; + continue; + } + + /* NULL character. */ + if(ch == _T('\0')) { + PUSH_MARK(ch, off, off+1, MD_MARK_RESOLVED); + off++; + continue; + } + + off++; + } + } + + /* Add a dummy mark at the end of the mark vector to simplify + * process_inlines(). */ + PUSH_MARK(127, ctx->size, ctx->size, MD_MARK_RESOLVED); + +abort: + return ret; +} + +static void +md_analyze_bracket(MD_CTX* ctx, int mark_index) +{ + /* We cannot really resolve links here as for that we would need + * more context. E.g. a following pair of brackets (reference link), + * or enclosing pair of brackets (if the inner is the link, the outer + * one cannot be.) + * + * Therefore we here only construct a list of '[' ']' pairs ordered by + * position of the closer. This allows us to analyze what is or is not + * link in the right order, from inside to outside in case of nested + * brackets. + * + * The resolving itself is deferred to md_resolve_links(). + */ + + MD_MARK* mark = &ctx->marks[mark_index]; + + if(mark->flags & MD_MARK_POTENTIAL_OPENER) { + if(BRACKET_OPENERS.head != -1) + ctx->marks[BRACKET_OPENERS.tail].flags |= MD_MARK_HASNESTEDBRACKETS; + + md_mark_chain_append(ctx, &BRACKET_OPENERS, mark_index); + return; + } + + if(BRACKET_OPENERS.tail >= 0) { + /* Pop the opener from the chain. */ + int opener_index = BRACKET_OPENERS.tail; + MD_MARK* opener = &ctx->marks[opener_index]; + if(opener->prev >= 0) + ctx->marks[opener->prev].next = -1; + else + BRACKET_OPENERS.head = -1; + BRACKET_OPENERS.tail = opener->prev; + + /* Interconnect the opener and closer. */ + opener->next = mark_index; + mark->prev = opener_index; + + /* Add the pair into chain of potential links for md_resolve_links(). + * Note we misuse opener->prev for this as opener->next points to its + * closer. */ + if(ctx->unresolved_link_tail >= 0) + ctx->marks[ctx->unresolved_link_tail].prev = opener_index; + else + ctx->unresolved_link_head = opener_index; + ctx->unresolved_link_tail = opener_index; + opener->prev = -1; + } +} + +/* Forward declaration. */ +static void md_analyze_link_contents(MD_CTX* ctx, const MD_LINE* lines, int n_lines, + int mark_beg, int mark_end); + +static int +md_resolve_links(MD_CTX* ctx, const MD_LINE* lines, int n_lines) +{ + int opener_index = ctx->unresolved_link_head; + OFF last_link_beg = 0; + OFF last_link_end = 0; + OFF last_img_beg = 0; + OFF last_img_end = 0; + + while(opener_index >= 0) { + MD_MARK* opener = &ctx->marks[opener_index]; + int closer_index = opener->next; + MD_MARK* closer = &ctx->marks[closer_index]; + int next_index = opener->prev; + MD_MARK* next_opener; + MD_MARK* next_closer; + MD_LINK_ATTR attr; + int is_link = FALSE; + + if(next_index >= 0) { + next_opener = &ctx->marks[next_index]; + next_closer = &ctx->marks[next_opener->next]; + } else { + next_opener = NULL; + next_closer = NULL; + } + + /* If nested ("[ [ ] ]"), we need to make sure that: + * - The outer does not end inside of (...) belonging to the inner. + * - The outer cannot be link if the inner is link (i.e. not image). + * + * (Note we here analyze from inner to outer as the marks are ordered + * by closer->beg.) + */ + if((opener->beg < last_link_beg && closer->end < last_link_end) || + (opener->beg < last_img_beg && closer->end < last_img_end) || + (opener->beg < last_link_end && opener->ch == '[')) + { + opener_index = next_index; + continue; + } + + /* Recognize and resolve wiki links. + * Wiki-links maybe '[[destination]]' or '[[destination|label]]'. + */ + if ((ctx->parser.flags & MD_FLAG_WIKILINKS) && + (opener->end - opener->beg == 1) && /* not image */ + next_opener != NULL && /* double '[' opener */ + next_opener->ch == '[' && + (next_opener->beg == opener->beg - 1) && + (next_opener->end - next_opener->beg == 1) && + next_closer != NULL && /* double ']' closer */ + next_closer->ch == ']' && + (next_closer->beg == closer->beg + 1) && + (next_closer->end - next_closer->beg == 1)) + { + MD_MARK* delim = NULL; + int delim_index; + OFF dest_beg, dest_end; + + is_link = TRUE; + + /* We don't allow destination to be longer than 100 characters. + * Lets scan to see whether there is '|'. (If not then the whole + * wiki-link has to be below the 100 characters.) */ + delim_index = opener_index + 1; + while(delim_index < closer_index) { + MD_MARK* m = &ctx->marks[delim_index]; + if(m->ch == '|') { + delim = m; + break; + } + if(m->ch != 'D' && m->beg - opener->end > 100) + break; + delim_index++; + } + dest_beg = opener->end; + dest_end = (delim != NULL) ? delim->beg : closer->beg; + if(dest_end - dest_beg == 0 || dest_end - dest_beg > 100) + is_link = FALSE; + + /* There may not be any new line in the destination. */ + if(is_link) { + OFF off; + for(off = dest_beg; off < dest_end; off++) { + if(ISNEWLINE(off)) { + is_link = FALSE; + break; + } + } + } + + if(is_link) { + if(delim != NULL) { + if(delim->end < closer->beg) { + md_rollback(ctx, opener_index, delim_index, MD_ROLLBACK_ALL); + md_rollback(ctx, delim_index, closer_index, MD_ROLLBACK_CROSSING); + delim->flags |= MD_MARK_RESOLVED; + opener->end = delim->beg; + } else { + /* The pipe is just before the closer: [[foo|]] */ + md_rollback(ctx, opener_index, closer_index, MD_ROLLBACK_ALL); + closer->beg = delim->beg; + delim = NULL; + } + } + + opener->beg = next_opener->beg; + opener->next = closer_index; + opener->flags |= MD_MARK_OPENER | MD_MARK_RESOLVED; + + closer->end = next_closer->end; + closer->prev = opener_index; + closer->flags |= MD_MARK_CLOSER | MD_MARK_RESOLVED; + + last_link_beg = opener->beg; + last_link_end = closer->end; + + if(delim != NULL) + md_analyze_link_contents(ctx, lines, n_lines, delim_index+1, closer_index); + + opener_index = next_opener->prev; + continue; + } + } + + if(next_opener != NULL && next_opener->beg == closer->end) { + if(next_closer->beg > closer->end + 1) { + /* Might be full reference link. */ + if(!(next_opener->flags & MD_MARK_HASNESTEDBRACKETS)) + is_link = md_is_link_reference(ctx, lines, n_lines, next_opener->beg, next_closer->end, &attr); + } else { + /* Might be shortcut reference link. */ + if(!(opener->flags & MD_MARK_HASNESTEDBRACKETS)) + is_link = md_is_link_reference(ctx, lines, n_lines, opener->beg, closer->end, &attr); + } + + if(is_link < 0) + return -1; + + if(is_link) { + /* Eat the 2nd "[...]". */ + closer->end = next_closer->end; + + /* Do not analyze the label as a standalone link in the next + * iteration. */ + next_index = ctx->marks[next_index].prev; + } + } else { + if(closer->end < ctx->size && CH(closer->end) == _T('(')) { + /* Might be inline link. */ + OFF inline_link_end = UINT_MAX; + + is_link = md_is_inline_link_spec(ctx, lines, n_lines, closer->end, &inline_link_end, &attr); + if(is_link < 0) + return -1; + + /* Check the closing ')' is not inside an already resolved range + * (i.e. a range with a higher priority), e.g. a code span. */ + if(is_link) { + int i = closer_index + 1; + + while(i < ctx->n_marks) { + MD_MARK* mark = &ctx->marks[i]; + + if(mark->beg >= inline_link_end) + break; + if((mark->flags & (MD_MARK_OPENER | MD_MARK_RESOLVED)) == (MD_MARK_OPENER | MD_MARK_RESOLVED)) { + if(ctx->marks[mark->next].beg >= inline_link_end) { + /* Cancel the link status. */ + if(attr.title_needs_free) + free(attr.title); + is_link = FALSE; + break; + } + + i = mark->next + 1; + } else { + i++; + } + } + } + + if(is_link) { + /* Eat the "(...)" */ + closer->end = inline_link_end; + } + } + + if(!is_link) { + /* Might be collapsed reference link. */ + if(!(opener->flags & MD_MARK_HASNESTEDBRACKETS)) + is_link = md_is_link_reference(ctx, lines, n_lines, opener->beg, closer->end, &attr); + if(is_link < 0) + return -1; + } + } + + if(is_link) { + /* Resolve the brackets as a link. */ + opener->flags |= MD_MARK_OPENER | MD_MARK_RESOLVED; + closer->flags |= MD_MARK_CLOSER | MD_MARK_RESOLVED; + + /* If it is a link, we store the destination and title in the two + * dummy marks after the opener. */ + MD_ASSERT(ctx->marks[opener_index+1].ch == 'D'); + ctx->marks[opener_index+1].beg = attr.dest_beg; + ctx->marks[opener_index+1].end = attr.dest_end; + + MD_ASSERT(ctx->marks[opener_index+2].ch == 'D'); + md_mark_store_ptr(ctx, opener_index+2, attr.title); + /* The title might or might not have been allocated for us. */ + if(attr.title_needs_free) + md_mark_chain_append(ctx, &PTR_CHAIN, opener_index+2); + ctx->marks[opener_index+2].prev = attr.title_size; + + if(opener->ch == '[') { + last_link_beg = opener->beg; + last_link_end = closer->end; + } else { + last_img_beg = opener->beg; + last_img_end = closer->end; + } + + md_analyze_link_contents(ctx, lines, n_lines, opener_index+1, closer_index); + + /* If the link text is formed by nothing but permissive autolink, + * suppress the autolink. + * See https://github.com/mity/md4c/issues/152 for more info. */ + if(ctx->parser.flags & MD_FLAG_PERMISSIVEAUTOLINKS) { + MD_MARK* first_nested; + MD_MARK* last_nested; + + first_nested = opener + 1; + while(first_nested->ch == _T('D') && first_nested < closer) + first_nested++; + + last_nested = closer - 1; + while(first_nested->ch == _T('D') && last_nested > opener) + last_nested--; + + if((first_nested->flags & MD_MARK_RESOLVED) && + first_nested->beg == opener->end && + ISANYOF_(first_nested->ch, _T("@:.")) && + first_nested->next == (last_nested - ctx->marks) && + last_nested->end == closer->beg) + { + first_nested->ch = _T('D'); + first_nested->flags &= ~MD_MARK_RESOLVED; + last_nested->ch = _T('D'); + last_nested->flags &= ~MD_MARK_RESOLVED; + } + } + } + + opener_index = next_index; + } + + return 0; +} + +/* Analyze whether the mark '&' starts a HTML entity. + * If so, update its flags as well as flags of corresponding closer ';'. */ +static void +md_analyze_entity(MD_CTX* ctx, int mark_index) +{ + MD_MARK* opener = &ctx->marks[mark_index]; + MD_MARK* closer; + OFF off; + + /* Cannot be entity if there is no closer as the next mark. + * (Any other mark between would mean strange character which cannot be + * part of the entity. + * + * So we can do all the work on '&' and do not call this later for the + * closing mark ';'. + */ + if(mark_index + 1 >= ctx->n_marks) + return; + closer = &ctx->marks[mark_index+1]; + if(closer->ch != ';') + return; + + if(md_is_entity(ctx, opener->beg, closer->end, &off)) { + MD_ASSERT(off == closer->end); + + md_resolve_range(ctx, NULL, mark_index, mark_index+1); + opener->end = closer->end; + } +} + +static void +md_analyze_table_cell_boundary(MD_CTX* ctx, int mark_index) +{ + MD_MARK* mark = &ctx->marks[mark_index]; + mark->flags |= MD_MARK_RESOLVED; + + md_mark_chain_append(ctx, &TABLECELLBOUNDARIES, mark_index); + ctx->n_table_cell_boundaries++; +} + +/* Split a longer mark into two. The new mark takes the given count of + * characters. May only be called if an adequate number of dummy 'D' marks + * follows. + */ +static int +md_split_emph_mark(MD_CTX* ctx, int mark_index, SZ n) +{ + MD_MARK* mark = &ctx->marks[mark_index]; + int new_mark_index = mark_index + (mark->end - mark->beg - n); + MD_MARK* dummy = &ctx->marks[new_mark_index]; + + MD_ASSERT(mark->end - mark->beg > n); + MD_ASSERT(dummy->ch == 'D'); + + memcpy(dummy, mark, sizeof(MD_MARK)); + mark->end -= n; + dummy->beg = mark->end; + + return new_mark_index; +} + +static void +md_analyze_emph(MD_CTX* ctx, int mark_index) +{ + MD_MARK* mark = &ctx->marks[mark_index]; + MD_MARKCHAIN* chain = md_mark_chain(ctx, mark_index); + + /* If we can be a closer, try to resolve with the preceding opener. */ + if(mark->flags & MD_MARK_POTENTIAL_CLOSER) { + MD_MARK* opener = NULL; + int opener_index = 0; + + if(mark->ch == _T('*')) { + MD_MARKCHAIN* opener_chains[6]; + int i, n_opener_chains; + unsigned flags = mark->flags; + + /* Apply the "rule of three". */ + n_opener_chains = 0; + opener_chains[n_opener_chains++] = &ASTERISK_OPENERS_intraword_mod3_0; + if((flags & MD_MARK_EMPH_MOD3_MASK) != MD_MARK_EMPH_MOD3_2) + opener_chains[n_opener_chains++] = &ASTERISK_OPENERS_intraword_mod3_1; + if((flags & MD_MARK_EMPH_MOD3_MASK) != MD_MARK_EMPH_MOD3_1) + opener_chains[n_opener_chains++] = &ASTERISK_OPENERS_intraword_mod3_2; + opener_chains[n_opener_chains++] = &ASTERISK_OPENERS_extraword_mod3_0; + if(!(flags & MD_MARK_EMPH_INTRAWORD) || (flags & MD_MARK_EMPH_MOD3_MASK) != MD_MARK_EMPH_MOD3_2) + opener_chains[n_opener_chains++] = &ASTERISK_OPENERS_extraword_mod3_1; + if(!(flags & MD_MARK_EMPH_INTRAWORD) || (flags & MD_MARK_EMPH_MOD3_MASK) != MD_MARK_EMPH_MOD3_1) + opener_chains[n_opener_chains++] = &ASTERISK_OPENERS_extraword_mod3_2; + + /* Opener is the most recent mark from the allowed chains. */ + for(i = 0; i < n_opener_chains; i++) { + if(opener_chains[i]->tail >= 0) { + int tmp_index = opener_chains[i]->tail; + MD_MARK* tmp_mark = &ctx->marks[tmp_index]; + if(opener == NULL || tmp_mark->end > opener->end) { + opener_index = tmp_index; + opener = tmp_mark; + } + } + } + } else { + /* Simple emph. mark */ + if(chain->tail >= 0) { + opener_index = chain->tail; + opener = &ctx->marks[opener_index]; + } + } + + /* Resolve, if we have found matching opener. */ + if(opener != NULL) { + SZ opener_size = opener->end - opener->beg; + SZ closer_size = mark->end - mark->beg; + MD_MARKCHAIN* opener_chain = md_mark_chain(ctx, opener_index); + + if(opener_size > closer_size) { + opener_index = md_split_emph_mark(ctx, opener_index, closer_size); + md_mark_chain_append(ctx, opener_chain, opener_index); + } else if(opener_size < closer_size) { + md_split_emph_mark(ctx, mark_index, closer_size - opener_size); + } + + md_rollback(ctx, opener_index, mark_index, MD_ROLLBACK_CROSSING); + md_resolve_range(ctx, opener_chain, opener_index, mark_index); + return; + } + } + + /* If we could not resolve as closer, we may be yet be an opener. */ + if(mark->flags & MD_MARK_POTENTIAL_OPENER) + md_mark_chain_append(ctx, chain, mark_index); +} + +static void +md_analyze_tilde(MD_CTX* ctx, int mark_index) +{ + MD_MARK* mark = &ctx->marks[mark_index]; + MD_MARKCHAIN* chain = md_mark_chain(ctx, mark_index); + + /* We attempt to be Github Flavored Markdown compatible here. GFM accepts + * only tildes sequences of length 1 and 2, and the length of the opener + * and closer has to match. */ + + if((mark->flags & MD_MARK_POTENTIAL_CLOSER) && chain->head >= 0) { + int opener_index = chain->head; + + md_rollback(ctx, opener_index, mark_index, MD_ROLLBACK_CROSSING); + md_resolve_range(ctx, chain, opener_index, mark_index); + return; + } + + if(mark->flags & MD_MARK_POTENTIAL_OPENER) + md_mark_chain_append(ctx, chain, mark_index); +} + +static void +md_analyze_dollar(MD_CTX* ctx, int mark_index) +{ + /* This should mimic the way inline equations work in LaTeX, so there + * can only ever be one item in the chain (i.e. the dollars can't be + * nested). This is basically the same as the md_analyze_tilde function, + * except that we require matching openers and closers to be of the same + * length. + * + * E.g.: $abc$$def$$ => abc (display equation) def (end equation) */ + if(DOLLAR_OPENERS.head >= 0) { + /* If the potential closer has a non-matching number of $, discard */ + MD_MARK* open = &ctx->marks[DOLLAR_OPENERS.head]; + MD_MARK* close = &ctx->marks[mark_index]; + + int opener_index = DOLLAR_OPENERS.head; + md_rollback(ctx, opener_index, mark_index, MD_ROLLBACK_ALL); + if (open->end - open->beg == close->end - close->beg) { + /* We are the matching closer */ + md_resolve_range(ctx, &DOLLAR_OPENERS, opener_index, mark_index); + return; + } + } + + md_mark_chain_append(ctx, &DOLLAR_OPENERS, mark_index); +} + +static void +md_analyze_permissive_url_autolink(MD_CTX* ctx, int mark_index) +{ + MD_MARK* opener = &ctx->marks[mark_index]; + int closer_index = mark_index + 1; + MD_MARK* closer = &ctx->marks[closer_index]; + MD_MARK* next_resolved_mark; + OFF off = opener->end; + int n_dots = FALSE; + int has_underscore_in_last_seg = FALSE; + int has_underscore_in_next_to_last_seg = FALSE; + int n_opened_parenthesis = 0; + int n_excess_parenthesis = 0; + + /* Check for domain. */ + while(off < ctx->size) { + if(ISALNUM(off) || CH(off) == _T('-')) { + off++; + } else if(CH(off) == _T('.')) { + /* We must see at least one period. */ + n_dots++; + has_underscore_in_next_to_last_seg = has_underscore_in_last_seg; + has_underscore_in_last_seg = FALSE; + off++; + } else if(CH(off) == _T('_')) { + /* No underscore may be present in the last two domain segments. */ + has_underscore_in_last_seg = TRUE; + off++; + } else { + break; + } + } + if(off > opener->end && CH(off-1) == _T('.')) { + off--; + n_dots--; + } + if(off <= opener->end || n_dots == 0 || has_underscore_in_next_to_last_seg || has_underscore_in_last_seg) + return; + + /* Check for path. */ + next_resolved_mark = closer + 1; + while(next_resolved_mark->ch == 'D' || !(next_resolved_mark->flags & MD_MARK_RESOLVED)) + next_resolved_mark++; + while(off < next_resolved_mark->beg && CH(off) != _T('<') && !ISWHITESPACE(off) && !ISNEWLINE(off)) { + /* Parenthesis must be balanced. */ + if(CH(off) == _T('(')) { + n_opened_parenthesis++; + } else if(CH(off) == _T(')')) { + if(n_opened_parenthesis > 0) + n_opened_parenthesis--; + else + n_excess_parenthesis++; + } + + off++; + } + + /* Trim a trailing punctuation from the end. */ + while(TRUE) { + if(ISANYOF(off-1, _T("?!.,:*_~"))) { + off--; + } else if(CH(off-1) == ')' && n_excess_parenthesis > 0) { + /* Unmatched ')' can be in an interior of the path but not at the + * of it, so the auto-link may be safely nested in a parenthesis + * pair. */ + off--; + n_excess_parenthesis--; + } else { + break; + } + } + + /* Ok. Lets call it an auto-link. Adapt opener and create closer to zero + * length so all the contents becomes the link text. */ + MD_ASSERT(closer->ch == 'D' || + ((ctx->parser.flags & MD_FLAG_PERMISSIVEWWWAUTOLINKS) && + (closer->ch == '.' || closer->ch == ':' || closer->ch == '@'))); + opener->end = opener->beg; + closer->ch = opener->ch; + closer->beg = off; + closer->end = off; + md_resolve_range(ctx, NULL, mark_index, closer_index); +} + +/* The permissive autolinks do not have to be enclosed in '<' '>' but we + * instead impose stricter rules what is understood as an e-mail address + * here. Actually any non-alphanumeric characters with exception of '.' + * are prohibited both in username and after '@'. */ +static void +md_analyze_permissive_email_autolink(MD_CTX* ctx, int mark_index) +{ + MD_MARK* opener = &ctx->marks[mark_index]; + int closer_index; + MD_MARK* closer; + OFF beg = opener->beg; + OFF end = opener->end; + int dot_count = 0; + + MD_ASSERT(opener->ch == _T('@')); + + /* Scan for name before '@'. */ + while(beg > 0 && (ISALNUM(beg-1) || ISANYOF(beg-1, _T(".-_+")))) + beg--; + + /* Scan for domain after '@'. */ + while(end < ctx->size && (ISALNUM(end) || ISANYOF(end, _T(".-_")))) { + if(CH(end) == _T('.')) + dot_count++; + end++; + } + if(CH(end-1) == _T('.')) { /* Final '.' not part of it. */ + dot_count--; + end--; + } + else if(ISANYOF2(end-1, _T('-'), _T('_'))) /* These are forbidden at the end. */ + return; + if(CH(end-1) == _T('@') || dot_count == 0) + return; + + /* Ok. Lets call it auto-link. Adapt opener and create closer to zero + * length so all the contents becomes the link text. */ + closer_index = mark_index + 1; + closer = &ctx->marks[closer_index]; + if (closer->ch != 'D') return; + + opener->beg = beg; + opener->end = beg; + closer->ch = opener->ch; + closer->beg = end; + closer->end = end; + md_resolve_range(ctx, NULL, mark_index, closer_index); +} + +static inline void +md_analyze_marks(MD_CTX* ctx, const MD_LINE* lines, int n_lines, + int mark_beg, int mark_end, const CHAR* mark_chars) +{ + int i = mark_beg; + MD_UNUSED(lines); + MD_UNUSED(n_lines); + + while(i < mark_end) { + MD_MARK* mark = &ctx->marks[i]; + + /* Skip resolved spans. */ + if(mark->flags & MD_MARK_RESOLVED) { + if(mark->flags & MD_MARK_OPENER) { + MD_ASSERT(i < mark->next); + i = mark->next + 1; + } else { + i++; + } + continue; + } + + /* Skip marks we do not want to deal with. */ + if(!ISANYOF_(mark->ch, mark_chars)) { + i++; + continue; + } + + /* Analyze the mark. */ + switch(mark->ch) { + case '[': /* Pass through. */ + case '!': /* Pass through. */ + case ']': md_analyze_bracket(ctx, i); break; + case '&': md_analyze_entity(ctx, i); break; + case '|': md_analyze_table_cell_boundary(ctx, i); break; + case '_': /* Pass through. */ + case '*': md_analyze_emph(ctx, i); break; + case '~': md_analyze_tilde(ctx, i); break; + case '$': md_analyze_dollar(ctx, i); break; + case '.': /* Pass through. */ + case ':': md_analyze_permissive_url_autolink(ctx, i); break; + case '@': md_analyze_permissive_email_autolink(ctx, i); break; + } + + i++; + } +} + +/* Analyze marks (build ctx->marks). */ +static int +md_analyze_inlines(MD_CTX* ctx, const MD_LINE* lines, int n_lines, int table_mode) +{ + int ret; + + /* Reset the previously collected stack of marks. */ + ctx->n_marks = 0; + + /* Collect all marks. */ + MD_CHECK(md_collect_marks(ctx, lines, n_lines, table_mode)); + + /* (1) Links. */ + md_analyze_marks(ctx, lines, n_lines, 0, ctx->n_marks, _T("[]!")); + MD_CHECK(md_resolve_links(ctx, lines, n_lines)); + BRACKET_OPENERS.head = -1; + BRACKET_OPENERS.tail = -1; + ctx->unresolved_link_head = -1; + ctx->unresolved_link_tail = -1; + + if(table_mode) { + /* (2) Analyze table cell boundaries. + * Note we reset TABLECELLBOUNDARIES chain prior to the call md_analyze_marks(), + * not after, because caller may need it. */ + MD_ASSERT(n_lines == 1); + TABLECELLBOUNDARIES.head = -1; + TABLECELLBOUNDARIES.tail = -1; + ctx->n_table_cell_boundaries = 0; + md_analyze_marks(ctx, lines, n_lines, 0, ctx->n_marks, _T("|")); + return ret; + } + + /* (3) Emphasis and strong emphasis; permissive autolinks. */ + md_analyze_link_contents(ctx, lines, n_lines, 0, ctx->n_marks); + +abort: + return ret; +} + +static void +md_analyze_link_contents(MD_CTX* ctx, const MD_LINE* lines, int n_lines, + int mark_beg, int mark_end) +{ + int i; + + md_analyze_marks(ctx, lines, n_lines, mark_beg, mark_end, _T("&")); + md_analyze_marks(ctx, lines, n_lines, mark_beg, mark_end, _T("*_~$@:.")); + + for(i = OPENERS_CHAIN_FIRST; i <= OPENERS_CHAIN_LAST; i++) { + ctx->mark_chains[i].head = -1; + ctx->mark_chains[i].tail = -1; + } +} + +static int +md_enter_leave_span_a(MD_CTX* ctx, int enter, MD_SPANTYPE type, + const CHAR* dest, SZ dest_size, int prohibit_escapes_in_dest, + const CHAR* title, SZ title_size) +{ + MD_ATTRIBUTE_BUILD href_build = { 0 }; + MD_ATTRIBUTE_BUILD title_build = { 0 }; + MD_SPAN_A_DETAIL det; + int ret = 0; + + /* Note we here rely on fact that MD_SPAN_A_DETAIL and + * MD_SPAN_IMG_DETAIL are binary-compatible. */ + memset(&det, 0, sizeof(MD_SPAN_A_DETAIL)); + MD_CHECK(md_build_attribute(ctx, dest, dest_size, + (prohibit_escapes_in_dest ? MD_BUILD_ATTR_NO_ESCAPES : 0), + &det.href, &href_build)); + MD_CHECK(md_build_attribute(ctx, title, title_size, 0, &det.title, &title_build)); + + if(enter) + MD_ENTER_SPAN(type, &det); + else + MD_LEAVE_SPAN(type, &det); + +abort: + md_free_attribute(ctx, &href_build); + md_free_attribute(ctx, &title_build); + return ret; +} + +static int +md_enter_leave_span_wikilink(MD_CTX* ctx, int enter, const CHAR* target, SZ target_size) +{ + MD_ATTRIBUTE_BUILD target_build = { 0 }; + MD_SPAN_WIKILINK_DETAIL det; + int ret = 0; + + memset(&det, 0, sizeof(MD_SPAN_WIKILINK_DETAIL)); + MD_CHECK(md_build_attribute(ctx, target, target_size, 0, &det.target, &target_build)); + + if (enter) + MD_ENTER_SPAN(MD_SPAN_WIKILINK, &det); + else + MD_LEAVE_SPAN(MD_SPAN_WIKILINK, &det); + +abort: + md_free_attribute(ctx, &target_build); + return ret; +} + + +/* Render the output, accordingly to the analyzed ctx->marks. */ +static int +md_process_inlines(MD_CTX* ctx, const MD_LINE* lines, int n_lines) +{ + MD_TEXTTYPE text_type; + const MD_LINE* line = lines; + MD_MARK* prev_mark = NULL; + MD_MARK* mark; + OFF off = lines[0].beg; + OFF end = lines[n_lines-1].end; + int enforce_hardbreak = 0; + int ret = 0; + + /* Find first resolved mark. Note there is always at least one resolved + * mark, the dummy last one after the end of the latest line we actually + * never really reach. This saves us of a lot of special checks and cases + * in this function. */ + mark = ctx->marks; + while(!(mark->flags & MD_MARK_RESOLVED)) + mark++; + + text_type = MD_TEXT_NORMAL; + + while(1) { + /* Process the text up to the next mark or end-of-line. */ + OFF tmp = (line->end < mark->beg ? line->end : mark->beg); + if(tmp > off) { + MD_TEXT(text_type, STR(off), tmp - off); + off = tmp; + } + + /* If reached the mark, process it and move to next one. */ + if(off >= mark->beg) { + switch(mark->ch) { + case '\\': /* Backslash escape. */ + if(ISNEWLINE(mark->beg+1)) + enforce_hardbreak = 1; + else + MD_TEXT(text_type, STR(mark->beg+1), 1); + break; + + case ' ': /* Non-trivial space. */ + MD_TEXT(text_type, _T(" "), 1); + break; + + case '`': /* Code span. */ + if(mark->flags & MD_MARK_OPENER) { + MD_ENTER_SPAN(MD_SPAN_CODE, NULL); + text_type = MD_TEXT_CODE; + } else { + MD_LEAVE_SPAN(MD_SPAN_CODE, NULL); + text_type = MD_TEXT_NORMAL; + } + break; + + case '_': /* Underline (or emphasis if we fall through). */ + if(ctx->parser.flags & MD_FLAG_UNDERLINE) { + if(mark->flags & MD_MARK_OPENER) { + while(off < mark->end) { + MD_ENTER_SPAN(MD_SPAN_U, NULL); + off++; + } + } else { + while(off < mark->end) { + MD_LEAVE_SPAN(MD_SPAN_U, NULL); + off++; + } + } + break; + } + MD_FALLTHROUGH(); + + case '*': /* Emphasis, strong emphasis. */ + if(mark->flags & MD_MARK_OPENER) { + if((mark->end - off) % 2) { + MD_ENTER_SPAN(MD_SPAN_EM, NULL); + off++; + } + while(off + 1 < mark->end) { + MD_ENTER_SPAN(MD_SPAN_STRONG, NULL); + off += 2; + } + } else { + while(off + 1 < mark->end) { + MD_LEAVE_SPAN(MD_SPAN_STRONG, NULL); + off += 2; + } + if((mark->end - off) % 2) { + MD_LEAVE_SPAN(MD_SPAN_EM, NULL); + off++; + } + } + break; + + case '~': + if(mark->flags & MD_MARK_OPENER) + MD_ENTER_SPAN(MD_SPAN_DEL, NULL); + else + MD_LEAVE_SPAN(MD_SPAN_DEL, NULL); + break; + + case '$': + if(mark->flags & MD_MARK_OPENER) { + MD_ENTER_SPAN((mark->end - off) % 2 ? MD_SPAN_LATEXMATH : MD_SPAN_LATEXMATH_DISPLAY, NULL); + text_type = MD_TEXT_LATEXMATH; + } else { + MD_LEAVE_SPAN((mark->end - off) % 2 ? MD_SPAN_LATEXMATH : MD_SPAN_LATEXMATH_DISPLAY, NULL); + text_type = MD_TEXT_NORMAL; + } + break; + + case '[': /* Link, wiki link, image. */ + case '!': + case ']': + { + const MD_MARK* opener = (mark->ch != ']' ? mark : &ctx->marks[mark->prev]); + const MD_MARK* closer = &ctx->marks[opener->next]; + const MD_MARK* dest_mark; + const MD_MARK* title_mark; + + if ((opener->ch == '[' && closer->ch == ']') && + opener->end - opener->beg >= 2 && + closer->end - closer->beg >= 2) + { + int has_label = (opener->end - opener->beg > 2); + SZ target_sz; + + if(has_label) + target_sz = opener->end - (opener->beg+2); + else + target_sz = closer->beg - opener->end; + + MD_CHECK(md_enter_leave_span_wikilink(ctx, (mark->ch != ']'), + has_label ? STR(opener->beg+2) : STR(opener->end), + target_sz)); + + break; + } + + dest_mark = opener+1; + MD_ASSERT(dest_mark->ch == 'D'); + title_mark = opener+2; + if (title_mark->ch != 'D') break; + + MD_CHECK(md_enter_leave_span_a(ctx, (mark->ch != ']'), + (opener->ch == '!' ? MD_SPAN_IMG : MD_SPAN_A), + STR(dest_mark->beg), dest_mark->end - dest_mark->beg, FALSE, + md_mark_get_ptr(ctx, (int)(title_mark - ctx->marks)), + title_mark->prev)); + + /* link/image closer may span multiple lines. */ + if(mark->ch == ']') { + while(mark->end > line->end) + line++; + } + + break; + } + + case '<': + case '>': /* Autolink or raw HTML. */ + if(!(mark->flags & MD_MARK_AUTOLINK)) { + /* Raw HTML. */ + if(mark->flags & MD_MARK_OPENER) + text_type = MD_TEXT_HTML; + else + text_type = MD_TEXT_NORMAL; + break; + } + /* Pass through, if auto-link. */ + MD_FALLTHROUGH(); + + case '@': /* Permissive e-mail autolink. */ + case ':': /* Permissive URL autolink. */ + case '.': /* Permissive WWW autolink. */ + { + MD_MARK* opener = ((mark->flags & MD_MARK_OPENER) ? mark : &ctx->marks[mark->prev]); + MD_MARK* closer = &ctx->marks[opener->next]; + const CHAR* dest = STR(opener->end); + SZ dest_size = closer->beg - opener->end; + + /* For permissive auto-links we do not know closer mark + * position at the time of md_collect_marks(), therefore + * it can be out-of-order in ctx->marks[]. + * + * With this flag, we make sure that we output the closer + * only if we processed the opener. */ + if(mark->flags & MD_MARK_OPENER) + closer->flags |= MD_MARK_VALIDPERMISSIVEAUTOLINK; + + if(opener->ch == '@' || opener->ch == '.') { + dest_size += 7; + MD_TEMP_BUFFER(dest_size * sizeof(CHAR)); + memcpy(ctx->buffer, + (opener->ch == '@' ? _T("mailto:") : _T("http://")), + 7 * sizeof(CHAR)); + memcpy(ctx->buffer + 7, dest, (dest_size-7) * sizeof(CHAR)); + dest = ctx->buffer; + } + + if(closer->flags & MD_MARK_VALIDPERMISSIVEAUTOLINK) + MD_CHECK(md_enter_leave_span_a(ctx, (mark->flags & MD_MARK_OPENER), + MD_SPAN_A, dest, dest_size, TRUE, NULL, 0)); + break; + } + + case '&': /* Entity. */ + MD_TEXT(MD_TEXT_ENTITY, STR(mark->beg), mark->end - mark->beg); + break; + + case '\0': + MD_TEXT(MD_TEXT_NULLCHAR, _T(""), 1); + break; + + case 127: + goto abort; + } + + off = mark->end; + + /* Move to next resolved mark. */ + prev_mark = mark; + mark++; + while(!(mark->flags & MD_MARK_RESOLVED) || mark->beg < off) + mark++; + } + + /* If reached end of line, move to next one. */ + if(off >= line->end) { + /* If it is the last line, we are done. */ + if(off >= end) + break; + + if(text_type == MD_TEXT_CODE || text_type == MD_TEXT_LATEXMATH) { + OFF tmp; + + MD_ASSERT(prev_mark != NULL); + MD_ASSERT(ISANYOF2_(prev_mark->ch, '`', '$') && (prev_mark->flags & MD_MARK_OPENER)); + MD_ASSERT(ISANYOF2_(mark->ch, '`', '$') && (mark->flags & MD_MARK_CLOSER)); + + /* Inside a code span, trailing line whitespace has to be + * outputted. */ + tmp = off; + while(off < ctx->size && ISBLANK(off)) + off++; + if(off > tmp) + MD_TEXT(text_type, STR(tmp), off-tmp); + + /* and new lines are transformed into single spaces. */ + if(prev_mark->end < off && off < mark->beg) + MD_TEXT(text_type, _T(" "), 1); + } else if(text_type == MD_TEXT_HTML) { + /* Inside raw HTML, we output the new line verbatim, including + * any trailing spaces. */ + OFF tmp = off; + + while(tmp < end && ISBLANK(tmp)) + tmp++; + if(tmp > off) + MD_TEXT(MD_TEXT_HTML, STR(off), tmp - off); + MD_TEXT(MD_TEXT_HTML, _T("\n"), 1); + } else { + /* Output soft or hard line break. */ + MD_TEXTTYPE break_type = MD_TEXT_SOFTBR; + + if(text_type == MD_TEXT_NORMAL) { + if(enforce_hardbreak) + break_type = MD_TEXT_BR; + else if((CH(line->end) == _T(' ') && CH(line->end+1) == _T(' '))) + break_type = MD_TEXT_BR; + } + + MD_TEXT(break_type, _T("\n"), 1); + } + + /* Move to the next line. */ + line++; + off = line->beg; + + enforce_hardbreak = 0; + } + } + +abort: + return ret; +} + + +/*************************** + *** Processing Tables *** + ***************************/ + +static void +md_analyze_table_alignment(MD_CTX* ctx, OFF beg, OFF end, MD_ALIGN* align, int n_align) +{ + static const MD_ALIGN align_map[] = { MD_ALIGN_DEFAULT, MD_ALIGN_LEFT, MD_ALIGN_RIGHT, MD_ALIGN_CENTER }; + OFF off = beg; + + while(n_align > 0) { + int index = 0; /* index into align_map[] */ + + while(CH(off) != _T('-')) + off++; + if(off > beg && CH(off-1) == _T(':')) + index |= 1; + while(off < end && CH(off) == _T('-')) + off++; + if(off < end && CH(off) == _T(':')) + index |= 2; + + *align = align_map[index]; + align++; + n_align--; + } + +} + +/* Forward declaration. */ +static int md_process_normal_block_contents(MD_CTX* ctx, const MD_LINE* lines, int n_lines); + +static int +md_process_table_cell(MD_CTX* ctx, MD_BLOCKTYPE cell_type, MD_ALIGN align, OFF beg, OFF end) +{ + MD_LINE line; + MD_BLOCK_TD_DETAIL det; + int ret = 0; + + while(beg < end && ISWHITESPACE(beg)) + beg++; + while(end > beg && ISWHITESPACE(end-1)) + end--; + + det.align = align; + line.beg = beg; + line.end = end; + + MD_ENTER_BLOCK(cell_type, &det); + MD_CHECK(md_process_normal_block_contents(ctx, &line, 1)); + MD_LEAVE_BLOCK(cell_type, &det); + +abort: + return ret; +} + +static int +md_process_table_row(MD_CTX* ctx, MD_BLOCKTYPE cell_type, OFF beg, OFF end, + const MD_ALIGN* align, int col_count) +{ + MD_LINE line; + OFF* pipe_offs = NULL; + int i, j, k, n; + int ret = 0; + + line.beg = beg; + line.end = end; + + /* Break the line into table cells by identifying pipe characters who + * form the cell boundary. */ + MD_CHECK(md_analyze_inlines(ctx, &line, 1, TRUE)); + + /* We have to remember the cell boundaries in local buffer because + * ctx->marks[] shall be reused during cell contents processing. */ + n = ctx->n_table_cell_boundaries + 2; + pipe_offs = (OFF*) malloc(n * sizeof(OFF)); + if(pipe_offs == NULL) { + MD_LOG("malloc() failed."); + ret = -1; + goto abort; + } + j = 0; + pipe_offs[j++] = beg; + for(i = TABLECELLBOUNDARIES.head; i >= 0; i = ctx->marks[i].next) { + MD_MARK* mark = &ctx->marks[i]; + pipe_offs[j++] = mark->end; + } + pipe_offs[j++] = end+1; + + /* Process cells. */ + MD_ENTER_BLOCK(MD_BLOCK_TR, NULL); + k = 0; + for(i = 0; i < j-1 && k < col_count; i++) { + if(pipe_offs[i] < pipe_offs[i+1]-1) + MD_CHECK(md_process_table_cell(ctx, cell_type, align[k++], pipe_offs[i], pipe_offs[i+1]-1)); + } + /* Make sure we call enough table cells even if the current table contains + * too few of them. */ + while(k < col_count) + MD_CHECK(md_process_table_cell(ctx, cell_type, align[k++], 0, 0)); + MD_LEAVE_BLOCK(MD_BLOCK_TR, NULL); + +abort: + free(pipe_offs); + + /* Free any temporary memory blocks stored within some dummy marks. */ + for(i = PTR_CHAIN.head; i >= 0; i = ctx->marks[i].next) + free(md_mark_get_ptr(ctx, i)); + PTR_CHAIN.head = -1; + PTR_CHAIN.tail = -1; + + return ret; +} + +static int +md_process_table_block_contents(MD_CTX* ctx, int col_count, const MD_LINE* lines, int n_lines) +{ + MD_ALIGN* align; + int i; + int ret = 0; + + /* At least two lines have to be present: The column headers and the line + * with the underlines. */ + MD_ASSERT(n_lines >= 2); + + align = malloc(col_count * sizeof(MD_ALIGN)); + if(align == NULL) { + MD_LOG("malloc() failed."); + ret = -1; + goto abort; + } + + md_analyze_table_alignment(ctx, lines[1].beg, lines[1].end, align, col_count); + + MD_ENTER_BLOCK(MD_BLOCK_THEAD, NULL); + MD_CHECK(md_process_table_row(ctx, MD_BLOCK_TH, + lines[0].beg, lines[0].end, align, col_count)); + MD_LEAVE_BLOCK(MD_BLOCK_THEAD, NULL); + + if(n_lines > 2) { + MD_ENTER_BLOCK(MD_BLOCK_TBODY, NULL); + for(i = 2; i < n_lines; i++) { + MD_CHECK(md_process_table_row(ctx, MD_BLOCK_TD, + lines[i].beg, lines[i].end, align, col_count)); + } + MD_LEAVE_BLOCK(MD_BLOCK_TBODY, NULL); + } + +abort: + free(align); + return ret; +} + + +/************************** + *** Processing Block *** + **************************/ + +#define MD_BLOCK_CONTAINER_OPENER 0x01 +#define MD_BLOCK_CONTAINER_CLOSER 0x02 +#define MD_BLOCK_CONTAINER (MD_BLOCK_CONTAINER_OPENER | MD_BLOCK_CONTAINER_CLOSER) +#define MD_BLOCK_LOOSE_LIST 0x04 +#define MD_BLOCK_SETEXT_HEADER 0x08 + +struct MD_BLOCK_tag { + MD_BLOCKTYPE type : 8; + unsigned flags : 8; + + /* MD_BLOCK_H: Header level (1 - 6) + * MD_BLOCK_CODE: Non-zero if fenced, zero if indented. + * MD_BLOCK_LI: Task mark character (0 if not task list item, 'x', 'X' or ' '). + * MD_BLOCK_TABLE: Column count (as determined by the table underline). + */ + unsigned data : 16; + + /* Leaf blocks: Count of lines (MD_LINE or MD_VERBATIMLINE) on the block. + * MD_BLOCK_LI: Task mark offset in the input doc. + * MD_BLOCK_OL: Start item number. + */ + unsigned n_lines; +}; + +struct MD_CONTAINER_tag { + CHAR ch; + unsigned is_loose : 8; + unsigned is_task : 8; + unsigned start; + unsigned mark_indent; + unsigned contents_indent; + OFF block_byte_off; + OFF task_mark_off; +}; + + +static int +md_process_normal_block_contents(MD_CTX* ctx, const MD_LINE* lines, int n_lines) +{ + int i; + int ret; + + MD_CHECK(md_analyze_inlines(ctx, lines, n_lines, FALSE)); + MD_CHECK(md_process_inlines(ctx, lines, n_lines)); + +abort: + /* Free any temporary memory blocks stored within some dummy marks. */ + for(i = PTR_CHAIN.head; i >= 0; i = ctx->marks[i].next) + free(md_mark_get_ptr(ctx, i)); + PTR_CHAIN.head = -1; + PTR_CHAIN.tail = -1; + + return ret; +} + +static int +md_process_verbatim_block_contents(MD_CTX* ctx, MD_TEXTTYPE text_type, const MD_VERBATIMLINE* lines, int n_lines) +{ + static const CHAR indent_chunk_str[] = _T(" "); + static const SZ indent_chunk_size = SIZEOF_ARRAY(indent_chunk_str) - 1; + + int i; + int ret = 0; + + for(i = 0; i < n_lines; i++) { + const MD_VERBATIMLINE* line = &lines[i]; + int indent = line->indent; + + MD_ASSERT(indent >= 0); + + /* Output code indentation. */ + while(indent > (int) indent_chunk_size) { + MD_TEXT(text_type, indent_chunk_str, indent_chunk_size); + indent -= indent_chunk_size; + } + if(indent > 0) + MD_TEXT(text_type, indent_chunk_str, indent); + + /* Output the code line itself. */ + MD_TEXT_INSECURE(text_type, STR(line->beg), line->end - line->beg); + + /* Enforce end-of-line. */ + MD_TEXT(text_type, _T("\n"), 1); + } + +abort: + return ret; +} + +static int +md_process_code_block_contents(MD_CTX* ctx, int is_fenced, const MD_VERBATIMLINE* lines, int n_lines) +{ + if(is_fenced) { + /* Skip the first line in case of fenced code: It is the fence. + * (Only the starting fence is present due to logic in md_analyze_line().) */ + lines++; + n_lines--; + } else { + /* Ignore blank lines at start/end of indented code block. */ + while(n_lines > 0 && lines[0].beg == lines[0].end) { + lines++; + n_lines--; + } + while(n_lines > 0 && lines[n_lines-1].beg == lines[n_lines-1].end) { + n_lines--; + } + } + + if(n_lines == 0) + return 0; + + return md_process_verbatim_block_contents(ctx, MD_TEXT_CODE, lines, n_lines); +} + +static int +md_setup_fenced_code_detail(MD_CTX* ctx, const MD_BLOCK* block, MD_BLOCK_CODE_DETAIL* det, + MD_ATTRIBUTE_BUILD* info_build, MD_ATTRIBUTE_BUILD* lang_build) +{ + const MD_VERBATIMLINE* fence_line = (const MD_VERBATIMLINE*)(block + 1); + OFF beg = fence_line->beg; + OFF end = fence_line->end; + OFF lang_end; + CHAR fence_ch = CH(fence_line->beg); + int ret = 0; + + /* Skip the fence itself. */ + while(beg < ctx->size && CH(beg) == fence_ch) + beg++; + /* Trim initial spaces. */ + while(beg < ctx->size && CH(beg) == _T(' ')) + beg++; + + /* Trim trailing spaces. */ + while(end > beg && CH(end-1) == _T(' ')) + end--; + + /* Build info string attribute. */ + MD_CHECK(md_build_attribute(ctx, STR(beg), end - beg, 0, &det->info, info_build)); + + /* Build info string attribute. */ + lang_end = beg; + while(lang_end < end && !ISWHITESPACE(lang_end)) + lang_end++; + MD_CHECK(md_build_attribute(ctx, STR(beg), lang_end - beg, 0, &det->lang, lang_build)); + + det->fence_char = fence_ch; + +abort: + return ret; +} + +static int +md_process_leaf_block(MD_CTX* ctx, const MD_BLOCK* block) +{ + union { + MD_BLOCK_H_DETAIL header; + MD_BLOCK_CODE_DETAIL code; + MD_BLOCK_TABLE_DETAIL table; + } det; + MD_ATTRIBUTE_BUILD info_build; + MD_ATTRIBUTE_BUILD lang_build; + int is_in_tight_list; + int clean_fence_code_detail = FALSE; + int ret = 0; + + memset(&det, 0, sizeof(det)); + + if(ctx->n_containers == 0) + is_in_tight_list = FALSE; + else + is_in_tight_list = !ctx->containers[ctx->n_containers-1].is_loose; + + switch(block->type) { + case MD_BLOCK_H: + det.header.level = block->data; + break; + + case MD_BLOCK_CODE: + /* For fenced code block, we may need to set the info string. */ + if(block->data != 0) { + memset(&det.code, 0, sizeof(MD_BLOCK_CODE_DETAIL)); + clean_fence_code_detail = TRUE; + MD_CHECK(md_setup_fenced_code_detail(ctx, block, &det.code, &info_build, &lang_build)); + } + break; + + case MD_BLOCK_TABLE: + det.table.col_count = block->data; + det.table.head_row_count = 1; + det.table.body_row_count = block->n_lines - 2; + break; + + default: + /* Noop. */ + break; + } + + if(!is_in_tight_list || block->type != MD_BLOCK_P) + MD_ENTER_BLOCK(block->type, (void*) &det); + + /* Process the block contents accordingly to is type. */ + switch(block->type) { + case MD_BLOCK_HR: + /* noop */ + break; + + case MD_BLOCK_CODE: + MD_CHECK(md_process_code_block_contents(ctx, (block->data != 0), + (const MD_VERBATIMLINE*)(block + 1), block->n_lines)); + break; + + case MD_BLOCK_HTML: + MD_CHECK(md_process_verbatim_block_contents(ctx, MD_TEXT_HTML, + (const MD_VERBATIMLINE*)(block + 1), block->n_lines)); + break; + + case MD_BLOCK_TABLE: + MD_CHECK(md_process_table_block_contents(ctx, block->data, + (const MD_LINE*)(block + 1), block->n_lines)); + break; + + default: + MD_CHECK(md_process_normal_block_contents(ctx, + (const MD_LINE*)(block + 1), block->n_lines)); + break; + } + + if(!is_in_tight_list || block->type != MD_BLOCK_P) + MD_LEAVE_BLOCK(block->type, (void*) &det); + +abort: + if(clean_fence_code_detail) { + md_free_attribute(ctx, &info_build); + md_free_attribute(ctx, &lang_build); + } + return ret; +} + +static int +md_process_all_blocks(MD_CTX* ctx) +{ + int byte_off = 0; + int ret = 0; + + /* ctx->containers now is not needed for detection of lists and list items + * so we reuse it for tracking what lists are loose or tight. We rely + * on the fact the vector is large enough to hold the deepest nesting + * level of lists. */ + ctx->n_containers = 0; + + while(byte_off < ctx->n_block_bytes) { + MD_BLOCK* block = (MD_BLOCK*)((char*)ctx->block_bytes + byte_off); + union { + MD_BLOCK_UL_DETAIL ul; + MD_BLOCK_OL_DETAIL ol; + MD_BLOCK_LI_DETAIL li; + } det; + + switch(block->type) { + case MD_BLOCK_UL: + det.ul.is_tight = (block->flags & MD_BLOCK_LOOSE_LIST) ? FALSE : TRUE; + det.ul.mark = (CHAR) block->data; + break; + + case MD_BLOCK_OL: + det.ol.start = block->n_lines; + det.ol.is_tight = (block->flags & MD_BLOCK_LOOSE_LIST) ? FALSE : TRUE; + det.ol.mark_delimiter = (CHAR) block->data; + break; + + case MD_BLOCK_LI: + det.li.is_task = (block->data != 0); + det.li.task_mark = (CHAR) block->data; + det.li.task_mark_offset = (OFF) block->n_lines; + break; + + default: + /* noop */ + break; + } + + if(block->flags & MD_BLOCK_CONTAINER) { + if(block->flags & MD_BLOCK_CONTAINER_CLOSER) { + MD_LEAVE_BLOCK(block->type, &det); + + if(block->type == MD_BLOCK_UL || block->type == MD_BLOCK_OL || block->type == MD_BLOCK_QUOTE) + ctx->n_containers--; + } + + if(block->flags & MD_BLOCK_CONTAINER_OPENER) { + MD_ENTER_BLOCK(block->type, &det); + + if(block->type == MD_BLOCK_UL || block->type == MD_BLOCK_OL) { + ctx->containers[ctx->n_containers].is_loose = (block->flags & MD_BLOCK_LOOSE_LIST); + ctx->n_containers++; + } else if(block->type == MD_BLOCK_QUOTE) { + /* This causes that any text in a block quote, even if + * nested inside a tight list item, is wrapped with + * <p>...</p>. */ + ctx->containers[ctx->n_containers].is_loose = TRUE; + ctx->n_containers++; + } + } + } else { + MD_CHECK(md_process_leaf_block(ctx, block)); + + if(block->type == MD_BLOCK_CODE || block->type == MD_BLOCK_HTML) + byte_off += block->n_lines * sizeof(MD_VERBATIMLINE); + else + byte_off += block->n_lines * sizeof(MD_LINE); + } + + byte_off += sizeof(MD_BLOCK); + } + + ctx->n_block_bytes = 0; + +abort: + return ret; +} + + +/************************************ + *** Grouping Lines into Blocks *** + ************************************/ + +static void* +md_push_block_bytes(MD_CTX* ctx, int n_bytes) +{ + void* ptr; + + if(ctx->n_block_bytes + n_bytes > ctx->alloc_block_bytes) { + void* new_block_bytes; + + ctx->alloc_block_bytes = (ctx->alloc_block_bytes > 0 + ? ctx->alloc_block_bytes + ctx->alloc_block_bytes / 2 + : 512); + new_block_bytes = realloc(ctx->block_bytes, ctx->alloc_block_bytes); + if(new_block_bytes == NULL) { + MD_LOG("realloc() failed."); + return NULL; + } + + /* Fix the ->current_block after the reallocation. */ + if(ctx->current_block != NULL) { + OFF off_current_block = (OFF) ((char*) ctx->current_block - (char*) ctx->block_bytes); + ctx->current_block = (MD_BLOCK*) ((char*) new_block_bytes + off_current_block); + } + + ctx->block_bytes = new_block_bytes; + } + + ptr = (char*)ctx->block_bytes + ctx->n_block_bytes; + ctx->n_block_bytes += n_bytes; + return ptr; +} + +static int +md_start_new_block(MD_CTX* ctx, const MD_LINE_ANALYSIS* line) +{ + MD_BLOCK* block; + + MD_ASSERT(ctx->current_block == NULL); + + block = (MD_BLOCK*) md_push_block_bytes(ctx, sizeof(MD_BLOCK)); + if(block == NULL) + return -1; + + switch(line->type) { + case MD_LINE_HR: + block->type = MD_BLOCK_HR; + break; + + case MD_LINE_ATXHEADER: + case MD_LINE_SETEXTHEADER: + block->type = MD_BLOCK_H; + break; + + case MD_LINE_FENCEDCODE: + case MD_LINE_INDENTEDCODE: + block->type = MD_BLOCK_CODE; + break; + + case MD_LINE_TEXT: + block->type = MD_BLOCK_P; + break; + + case MD_LINE_HTML: + block->type = MD_BLOCK_HTML; + break; + + case MD_LINE_BLANK: + case MD_LINE_SETEXTUNDERLINE: + case MD_LINE_TABLEUNDERLINE: + default: + MD_UNREACHABLE(); + break; + } + + block->flags = 0; + block->data = line->data; + block->n_lines = 0; + + ctx->current_block = block; + return 0; +} + +/* Eat from start of current (textual) block any reference definitions and + * remember them so we can resolve any links referring to them. + * + * (Reference definitions can only be at start of it as they cannot break + * a paragraph.) + */ +static int +md_consume_link_reference_definitions(MD_CTX* ctx) +{ + MD_LINE* lines = (MD_LINE*) (ctx->current_block + 1); + int n_lines = ctx->current_block->n_lines; + int n = 0; + + /* Compute how many lines at the start of the block form one or more + * reference definitions. */ + while(n < n_lines) { + int n_link_ref_lines; + + n_link_ref_lines = md_is_link_reference_definition(ctx, + lines + n, n_lines - n); + /* Not a reference definition? */ + if(n_link_ref_lines == 0) + break; + + /* We fail if it is the ref. def. but it could not be stored due + * a memory allocation error. */ + if(n_link_ref_lines < 0) + return -1; + + n += n_link_ref_lines; + } + + /* If there was at least one reference definition, we need to remove + * its lines from the block, or perhaps even the whole block. */ + if(n > 0) { + if(n == n_lines) { + /* Remove complete block. */ + ctx->n_block_bytes -= n * sizeof(MD_LINE); + ctx->n_block_bytes -= sizeof(MD_BLOCK); + ctx->current_block = NULL; + } else { + /* Remove just some initial lines from the block. */ + memmove(lines, lines + n, (n_lines - n) * sizeof(MD_LINE)); + ctx->current_block->n_lines -= n; + ctx->n_block_bytes -= n * sizeof(MD_LINE); + } + } + + return 0; +} + +static int +md_end_current_block(MD_CTX* ctx) +{ + int ret = 0; + + if(ctx->current_block == NULL) + return ret; + + /* Check whether there is a reference definition. (We do this here instead + * of in md_analyze_line() because reference definition can take multiple + * lines.) */ + if(ctx->current_block->type == MD_BLOCK_P || + (ctx->current_block->type == MD_BLOCK_H && (ctx->current_block->flags & MD_BLOCK_SETEXT_HEADER))) + { + MD_LINE* lines = (MD_LINE*) (ctx->current_block + 1); + if(CH(lines[0].beg) == _T('[')) { + MD_CHECK(md_consume_link_reference_definitions(ctx)); + if(ctx->current_block == NULL) + return ret; + } + } + + if(ctx->current_block->type == MD_BLOCK_H && (ctx->current_block->flags & MD_BLOCK_SETEXT_HEADER)) { + int n_lines = ctx->current_block->n_lines; + + if(n_lines > 1) { + /* Get rid of the underline. */ + ctx->current_block->n_lines--; + ctx->n_block_bytes -= sizeof(MD_LINE); + } else { + /* Only the underline has left after eating the ref. defs. + * Keep the line as beginning of a new ordinary paragraph. */ + ctx->current_block->type = MD_BLOCK_P; + return 0; + } + } + + /* Mark we are not building any block anymore. */ + ctx->current_block = NULL; + +abort: + return ret; +} + +static int +md_add_line_into_current_block(MD_CTX* ctx, const MD_LINE_ANALYSIS* analysis) +{ + MD_ASSERT(ctx->current_block != NULL); + + if(ctx->current_block->type == MD_BLOCK_CODE || ctx->current_block->type == MD_BLOCK_HTML) { + MD_VERBATIMLINE* line; + + line = (MD_VERBATIMLINE*) md_push_block_bytes(ctx, sizeof(MD_VERBATIMLINE)); + if(line == NULL) + return -1; + + line->indent = analysis->indent; + line->beg = analysis->beg; + line->end = analysis->end; + } else { + MD_LINE* line; + + line = (MD_LINE*) md_push_block_bytes(ctx, sizeof(MD_LINE)); + if(line == NULL) + return -1; + + line->beg = analysis->beg; + line->end = analysis->end; + } + ctx->current_block->n_lines++; + + return 0; +} + +static int +md_push_container_bytes(MD_CTX* ctx, MD_BLOCKTYPE type, unsigned start, + unsigned data, unsigned flags) +{ + MD_BLOCK* block; + int ret = 0; + + MD_CHECK(md_end_current_block(ctx)); + + block = (MD_BLOCK*) md_push_block_bytes(ctx, sizeof(MD_BLOCK)); + if(block == NULL) + return -1; + + block->type = type; + block->flags = flags; + block->data = data; + block->n_lines = start; + +abort: + return ret; +} + + + +/*********************** + *** Line Analysis *** + ***********************/ + +static int +md_is_hr_line(MD_CTX* ctx, OFF beg, OFF* p_end, OFF* p_killer) +{ + OFF off = beg + 1; + int n = 1; + + while(off < ctx->size && (CH(off) == CH(beg) || CH(off) == _T(' ') || CH(off) == _T('\t'))) { + if(CH(off) == CH(beg)) + n++; + off++; + } + + if(n < 3) { + *p_killer = off; + return FALSE; + } + + /* Nothing else can be present on the line. */ + if(off < ctx->size && !ISNEWLINE(off)) { + *p_killer = off; + return FALSE; + } + + *p_end = off; + return TRUE; +} + +static int +md_is_atxheader_line(MD_CTX* ctx, OFF beg, OFF* p_beg, OFF* p_end, unsigned* p_level) +{ + int n; + OFF off = beg + 1; + + while(off < ctx->size && CH(off) == _T('#') && off - beg < 7) + off++; + n = off - beg; + + if(n > 6) + return FALSE; + *p_level = n; + + if(!(ctx->parser.flags & MD_FLAG_PERMISSIVEATXHEADERS) && off < ctx->size && + CH(off) != _T(' ') && CH(off) != _T('\t') && !ISNEWLINE(off)) + return FALSE; + + while(off < ctx->size && CH(off) == _T(' ')) + off++; + *p_beg = off; + *p_end = off; + return TRUE; +} + +static int +md_is_setext_underline(MD_CTX* ctx, OFF beg, OFF* p_end, unsigned* p_level) +{ + OFF off = beg + 1; + + while(off < ctx->size && CH(off) == CH(beg)) + off++; + + /* Optionally, space(s) can follow. */ + while(off < ctx->size && CH(off) == _T(' ')) + off++; + + /* But nothing more is allowed on the line. */ + if(off < ctx->size && !ISNEWLINE(off)) + return FALSE; + + *p_level = (CH(beg) == _T('=') ? 1 : 2); + *p_end = off; + return TRUE; +} + +static int +md_is_table_underline(MD_CTX* ctx, OFF beg, OFF* p_end, unsigned* p_col_count) +{ + OFF off = beg; + int found_pipe = FALSE; + unsigned col_count = 0; + + if(off < ctx->size && CH(off) == _T('|')) { + found_pipe = TRUE; + off++; + while(off < ctx->size && ISWHITESPACE(off)) + off++; + } + + while(1) { + int delimited = FALSE; + + /* Cell underline ("-----", ":----", "----:" or ":----:") */ + if(off < ctx->size && CH(off) == _T(':')) + off++; + if(off >= ctx->size || CH(off) != _T('-')) + return FALSE; + while(off < ctx->size && CH(off) == _T('-')) + off++; + if(off < ctx->size && CH(off) == _T(':')) + off++; + + col_count++; + + /* Pipe delimiter (optional at the end of line). */ + while(off < ctx->size && ISWHITESPACE(off)) + off++; + if(off < ctx->size && CH(off) == _T('|')) { + delimited = TRUE; + found_pipe = TRUE; + off++; + while(off < ctx->size && ISWHITESPACE(off)) + off++; + } + + /* Success, if we reach end of line. */ + if(off >= ctx->size || ISNEWLINE(off)) + break; + + if(!delimited) + return FALSE; + } + + if(!found_pipe) + return FALSE; + + *p_end = off; + *p_col_count = col_count; + return TRUE; +} + +static int +md_is_opening_code_fence(MD_CTX* ctx, OFF beg, OFF* p_end) +{ + OFF off = beg; + + while(off < ctx->size && CH(off) == CH(beg)) + off++; + + /* Fence must have at least three characters. */ + if(off - beg < 3) + return FALSE; + + ctx->code_fence_length = off - beg; + + /* Optionally, space(s) can follow. */ + while(off < ctx->size && CH(off) == _T(' ')) + off++; + + /* Optionally, an info string can follow. */ + while(off < ctx->size && !ISNEWLINE(off)) { + /* Backtick-based fence must not contain '`' in the info string. */ + if(CH(beg) == _T('`') && CH(off) == _T('`')) + return FALSE; + off++; + } + + *p_end = off; + return TRUE; +} + +static int +md_is_closing_code_fence(MD_CTX* ctx, CHAR ch, OFF beg, OFF* p_end) +{ + OFF off = beg; + int ret = FALSE; + + /* Closing fence must have at least the same length and use same char as + * opening one. */ + while(off < ctx->size && CH(off) == ch) + off++; + if(off - beg < ctx->code_fence_length) + goto out; + + /* Optionally, space(s) can follow */ + while(off < ctx->size && CH(off) == _T(' ')) + off++; + + /* But nothing more is allowed on the line. */ + if(off < ctx->size && !ISNEWLINE(off)) + goto out; + + ret = TRUE; + +out: + /* Note we set *p_end even on failure: If we are not closing fence, caller + * would eat the line anyway without any parsing. */ + *p_end = off; + return ret; +} + +/* Returns type of the raw HTML block, or FALSE if it is not HTML block. + * (Refer to CommonMark specification for details about the types.) + */ +static int +md_is_html_block_start_condition(MD_CTX* ctx, OFF beg) +{ + typedef struct TAG_tag TAG; + struct TAG_tag { + const CHAR* name; + unsigned len : 8; + }; + + /* Type 6 is started by a long list of allowed tags. We use two-level + * tree to speed-up the search. */ +#ifdef X + #undef X +#endif +#define X(name) { _T(name), (sizeof(name)-1) / sizeof(CHAR) } +#define Xend { NULL, 0 } + static const TAG t1[] = { X("pre"), X("script"), X("style"), X("textarea"), Xend }; + + static const TAG a6[] = { X("address"), X("article"), X("aside"), Xend }; + static const TAG b6[] = { X("base"), X("basefont"), X("blockquote"), X("body"), Xend }; + static const TAG c6[] = { X("caption"), X("center"), X("col"), X("colgroup"), Xend }; + static const TAG d6[] = { X("dd"), X("details"), X("dialog"), X("dir"), + X("div"), X("dl"), X("dt"), Xend }; + static const TAG f6[] = { X("fieldset"), X("figcaption"), X("figure"), X("footer"), + X("form"), X("frame"), X("frameset"), Xend }; + static const TAG h6[] = { X("h1"), X("head"), X("header"), X("hr"), X("html"), Xend }; + static const TAG i6[] = { X("iframe"), Xend }; + static const TAG l6[] = { X("legend"), X("li"), X("link"), Xend }; + static const TAG m6[] = { X("main"), X("menu"), X("menuitem"), Xend }; + static const TAG n6[] = { X("nav"), X("noframes"), Xend }; + static const TAG o6[] = { X("ol"), X("optgroup"), X("option"), Xend }; + static const TAG p6[] = { X("p"), X("param"), Xend }; + static const TAG s6[] = { X("section"), X("source"), X("summary"), Xend }; + static const TAG t6[] = { X("table"), X("tbody"), X("td"), X("tfoot"), X("th"), + X("thead"), X("title"), X("tr"), X("track"), Xend }; + static const TAG u6[] = { X("ul"), Xend }; + static const TAG xx[] = { Xend }; +#undef X + + static const TAG* map6[26] = { + a6, b6, c6, d6, xx, f6, xx, h6, i6, xx, xx, l6, m6, + n6, o6, p6, xx, xx, s6, t6, u6, xx, xx, xx, xx, xx + }; + OFF off = beg + 1; + int i; + + /* Check for type 1: <script, <pre, or <style */ + for(i = 0; t1[i].name != NULL; i++) { + if(off + t1[i].len <= ctx->size) { + if(md_ascii_case_eq(STR(off), t1[i].name, t1[i].len)) + return 1; + } + } + + /* Check for type 2: <!-- */ + if(off + 3 < ctx->size && CH(off) == _T('!') && CH(off+1) == _T('-') && CH(off+2) == _T('-')) + return 2; + + /* Check for type 3: <? */ + if(off < ctx->size && CH(off) == _T('?')) + return 3; + + /* Check for type 4 or 5: <! */ + if(off < ctx->size && CH(off) == _T('!')) { + /* Check for type 4: <! followed by uppercase letter. */ + if(off + 1 < ctx->size && ISASCII(off+1)) + return 4; + + /* Check for type 5: <![CDATA[ */ + if(off + 8 < ctx->size) { + if(md_ascii_eq(STR(off), _T("![CDATA["), 8)) + return 5; + } + } + + /* Check for type 6: Many possible starting tags listed above. */ + if(off + 1 < ctx->size && (ISALPHA(off) || (CH(off) == _T('/') && ISALPHA(off+1)))) { + int slot; + const TAG* tags; + + if(CH(off) == _T('/')) + off++; + + slot = (ISUPPER(off) ? CH(off) - 'A' : CH(off) - 'a'); + tags = map6[slot]; + + for(i = 0; tags[i].name != NULL; i++) { + if(off + tags[i].len <= ctx->size) { + if(md_ascii_case_eq(STR(off), tags[i].name, tags[i].len)) { + OFF tmp = off + tags[i].len; + if(tmp >= ctx->size) + return 6; + if(ISBLANK(tmp) || ISNEWLINE(tmp) || CH(tmp) == _T('>')) + return 6; + if(tmp+1 < ctx->size && CH(tmp) == _T('/') && CH(tmp+1) == _T('>')) + return 6; + break; + } + } + } + } + + /* Check for type 7: any COMPLETE other opening or closing tag. */ + if(off + 1 < ctx->size) { + OFF end; + + if(md_is_html_tag(ctx, NULL, 0, beg, ctx->size, &end)) { + /* Only optional whitespace and new line may follow. */ + while(end < ctx->size && ISWHITESPACE(end)) + end++; + if(end >= ctx->size || ISNEWLINE(end)) + return 7; + } + } + + return FALSE; +} + +/* Case sensitive check whether there is a substring 'what' between 'beg' + * and end of line. */ +static int +md_line_contains(MD_CTX* ctx, OFF beg, const CHAR* what, SZ what_len, OFF* p_end) +{ + OFF i; + for(i = beg; i + what_len < ctx->size; i++) { + if(ISNEWLINE(i)) + break; + if(memcmp(STR(i), what, what_len * sizeof(CHAR)) == 0) { + *p_end = i + what_len; + return TRUE; + } + } + + *p_end = i; + return FALSE; +} + +/* Returns type of HTML block end condition or FALSE if not an end condition. + * + * Note it fills p_end even when it is not end condition as the caller + * does not need to analyze contents of a raw HTML block. + */ +static int +md_is_html_block_end_condition(MD_CTX* ctx, OFF beg, OFF* p_end) +{ + switch(ctx->html_block_type) { + case 1: + { + OFF off = beg; + + while(off < ctx->size && !ISNEWLINE(off)) { + if(CH(off) == _T('<')) { + #define FIND_TAG_END(string, length) \ + if(off + length <= ctx->size && \ + md_ascii_case_eq(STR(off), _T(string), length)) { \ + *p_end = off + length; \ + return TRUE; \ + } + FIND_TAG_END("</script>", 9) + FIND_TAG_END("</style>", 8) + FIND_TAG_END("</pre>", 6) + #undef FIND_TAG_END + } + + off++; + } + *p_end = off; + return FALSE; + } + + case 2: + return (md_line_contains(ctx, beg, _T("-->"), 3, p_end) ? 2 : FALSE); + + case 3: + return (md_line_contains(ctx, beg, _T("?>"), 2, p_end) ? 3 : FALSE); + + case 4: + return (md_line_contains(ctx, beg, _T(">"), 1, p_end) ? 4 : FALSE); + + case 5: + return (md_line_contains(ctx, beg, _T("]]>"), 3, p_end) ? 5 : FALSE); + + case 6: /* Pass through */ + case 7: + *p_end = beg; + return (beg >= ctx->size || ISNEWLINE(beg) ? ctx->html_block_type : FALSE); + + default: + MD_UNREACHABLE(); + } + return FALSE; +} + + +static int +md_is_container_compatible(const MD_CONTAINER* pivot, const MD_CONTAINER* container) +{ + /* Block quote has no "items" like lists. */ + if(container->ch == _T('>')) + return FALSE; + + if(container->ch != pivot->ch) + return FALSE; + if(container->mark_indent > pivot->contents_indent) + return FALSE; + + return TRUE; +} + +static int +md_push_container(MD_CTX* ctx, const MD_CONTAINER* container) +{ + if(ctx->n_containers >= ctx->alloc_containers) { + MD_CONTAINER* new_containers; + + ctx->alloc_containers = (ctx->alloc_containers > 0 + ? ctx->alloc_containers + ctx->alloc_containers / 2 + : 16); + new_containers = realloc(ctx->containers, ctx->alloc_containers * sizeof(MD_CONTAINER)); + if(new_containers == NULL) { + MD_LOG("realloc() failed."); + return -1; + } + + ctx->containers = new_containers; + } + + memcpy(&ctx->containers[ctx->n_containers++], container, sizeof(MD_CONTAINER)); + return 0; +} + +static int +md_enter_child_containers(MD_CTX* ctx, int n_children) +{ + int i; + int ret = 0; + + for(i = ctx->n_containers - n_children; i < ctx->n_containers; i++) { + MD_CONTAINER* c = &ctx->containers[i]; + int is_ordered_list = FALSE; + + switch(c->ch) { + case _T(')'): + case _T('.'): + is_ordered_list = TRUE; + MD_FALLTHROUGH(); + + case _T('-'): + case _T('+'): + case _T('*'): + /* Remember offset in ctx->block_bytes so we can revisit the + * block if we detect it is a loose list. */ + md_end_current_block(ctx); + c->block_byte_off = ctx->n_block_bytes; + + MD_CHECK(md_push_container_bytes(ctx, + (is_ordered_list ? MD_BLOCK_OL : MD_BLOCK_UL), + c->start, c->ch, MD_BLOCK_CONTAINER_OPENER)); + MD_CHECK(md_push_container_bytes(ctx, MD_BLOCK_LI, + c->task_mark_off, + (c->is_task ? CH(c->task_mark_off) : 0), + MD_BLOCK_CONTAINER_OPENER)); + break; + + case _T('>'): + MD_CHECK(md_push_container_bytes(ctx, MD_BLOCK_QUOTE, 0, 0, MD_BLOCK_CONTAINER_OPENER)); + break; + + default: + MD_UNREACHABLE(); + break; + } + } + +abort: + return ret; +} + +static int +md_leave_child_containers(MD_CTX* ctx, int n_keep) +{ + int ret = 0; + + while(ctx->n_containers > n_keep) { + MD_CONTAINER* c = &ctx->containers[ctx->n_containers-1]; + int is_ordered_list = FALSE; + + switch(c->ch) { + case _T(')'): + case _T('.'): + is_ordered_list = TRUE; + MD_FALLTHROUGH(); + + case _T('-'): + case _T('+'): + case _T('*'): + MD_CHECK(md_push_container_bytes(ctx, MD_BLOCK_LI, + c->task_mark_off, (c->is_task ? CH(c->task_mark_off) : 0), + MD_BLOCK_CONTAINER_CLOSER)); + MD_CHECK(md_push_container_bytes(ctx, + (is_ordered_list ? MD_BLOCK_OL : MD_BLOCK_UL), 0, + c->ch, MD_BLOCK_CONTAINER_CLOSER)); + break; + + case _T('>'): + MD_CHECK(md_push_container_bytes(ctx, MD_BLOCK_QUOTE, 0, + 0, MD_BLOCK_CONTAINER_CLOSER)); + break; + + default: + MD_UNREACHABLE(); + break; + } + + ctx->n_containers--; + } + +abort: + return ret; +} + +static int +md_is_container_mark(MD_CTX* ctx, unsigned indent, OFF beg, OFF* p_end, MD_CONTAINER* p_container) +{ + OFF off = beg; + OFF max_end; + + if(off >= ctx->size || indent >= ctx->code_indent_offset) + return FALSE; + + /* Check for block quote mark. */ + if(CH(off) == _T('>')) { + off++; + p_container->ch = _T('>'); + p_container->is_loose = FALSE; + p_container->is_task = FALSE; + p_container->mark_indent = indent; + p_container->contents_indent = indent + 1; + *p_end = off; + return TRUE; + } + + /* Check for list item bullet mark. */ + if(ISANYOF(off, _T("-+*")) && (off+1 >= ctx->size || ISBLANK(off+1) || ISNEWLINE(off+1))) { + p_container->ch = CH(off); + p_container->is_loose = FALSE; + p_container->is_task = FALSE; + p_container->mark_indent = indent; + p_container->contents_indent = indent + 1; + *p_end = off+1; + return TRUE; + } + + /* Check for ordered list item marks. */ + max_end = off + 9; + if(max_end > ctx->size) + max_end = ctx->size; + p_container->start = 0; + while(off < max_end && ISDIGIT(off)) { + p_container->start = p_container->start * 10 + CH(off) - _T('0'); + off++; + } + if(off > beg && + off < ctx->size && + (CH(off) == _T('.') || CH(off) == _T(')')) && + (off+1 >= ctx->size || ISBLANK(off+1) || ISNEWLINE(off+1))) + { + p_container->ch = CH(off); + p_container->is_loose = FALSE; + p_container->is_task = FALSE; + p_container->mark_indent = indent; + p_container->contents_indent = indent + off - beg + 1; + *p_end = off+1; + return TRUE; + } + + return FALSE; +} + +static unsigned +md_line_indentation(MD_CTX* ctx, unsigned total_indent, OFF beg, OFF* p_end) +{ + OFF off = beg; + unsigned indent = total_indent; + + while(off < ctx->size && ISBLANK(off)) { + if(CH(off) == _T('\t')) + indent = (indent + 4) & ~3; + else + indent++; + off++; + } + + *p_end = off; + return indent - total_indent; +} + +static const MD_LINE_ANALYSIS md_dummy_blank_line = { MD_LINE_BLANK, 0, 0, 0, 0 }; + +/* Analyze type of the line and find some its properties. This serves as a + * main input for determining type and boundaries of a block. */ +static int +md_analyze_line(MD_CTX* ctx, OFF beg, OFF* p_end, + const MD_LINE_ANALYSIS* pivot_line, MD_LINE_ANALYSIS* line) +{ + unsigned total_indent = 0; + int n_parents = 0; + int n_brothers = 0; + int n_children = 0; + MD_CONTAINER container = { 0 }; + int prev_line_has_list_loosening_effect = ctx->last_line_has_list_loosening_effect; + OFF off = beg; + OFF hr_killer = 0; + int ret = 0; + + line->indent = md_line_indentation(ctx, total_indent, off, &off); + total_indent += line->indent; + line->beg = off; + + /* Given the indentation and block quote marks '>', determine how many of + * the current containers are our parents. */ + while(n_parents < ctx->n_containers) { + MD_CONTAINER* c = &ctx->containers[n_parents]; + + if(c->ch == _T('>') && line->indent < ctx->code_indent_offset && + off < ctx->size && CH(off) == _T('>')) + { + /* Block quote mark. */ + off++; + total_indent++; + line->indent = md_line_indentation(ctx, total_indent, off, &off); + total_indent += line->indent; + + /* The optional 1st space after '>' is part of the block quote mark. */ + if(line->indent > 0) + line->indent--; + + line->beg = off; + + } else if(c->ch != _T('>') && line->indent >= c->contents_indent) { + /* List. */ + line->indent -= c->contents_indent; + } else { + break; + } + + n_parents++; + } + + if(off >= ctx->size || ISNEWLINE(off)) { + /* Blank line does not need any real indentation to be nested inside + * a list. */ + if(n_brothers + n_children == 0) { + while(n_parents < ctx->n_containers && ctx->containers[n_parents].ch != _T('>')) + n_parents++; + } + } + + while(TRUE) { + /* Check whether we are fenced code continuation. */ + if(pivot_line->type == MD_LINE_FENCEDCODE) { + line->beg = off; + + /* We are another MD_LINE_FENCEDCODE unless we are closing fence + * which we transform into MD_LINE_BLANK. */ + if(line->indent < ctx->code_indent_offset) { + if(md_is_closing_code_fence(ctx, CH(pivot_line->beg), off, &off)) { + line->type = MD_LINE_BLANK; + ctx->last_line_has_list_loosening_effect = FALSE; + break; + } + } + + /* Change indentation accordingly to the initial code fence. */ + if(n_parents == ctx->n_containers) { + if(line->indent > pivot_line->indent) + line->indent -= pivot_line->indent; + else + line->indent = 0; + + line->type = MD_LINE_FENCEDCODE; + break; + } + } + + /* Check whether we are HTML block continuation. */ + if(pivot_line->type == MD_LINE_HTML && ctx->html_block_type > 0) { + if(n_parents < ctx->n_containers) { + /* HTML block is implicitly ended if the enclosing container + * block ends. */ + ctx->html_block_type = 0; + } else { + int html_block_type; + + html_block_type = md_is_html_block_end_condition(ctx, off, &off); + if(html_block_type > 0) { + MD_ASSERT(html_block_type == ctx->html_block_type); + + /* Make sure this is the last line of the block. */ + ctx->html_block_type = 0; + + /* Some end conditions serve as blank lines at the same time. */ + if(html_block_type == 6 || html_block_type == 7) { + line->type = MD_LINE_BLANK; + line->indent = 0; + break; + } + } + + line->type = MD_LINE_HTML; + n_parents = ctx->n_containers; + break; + } + } + + /* Check for blank line. */ + if(off >= ctx->size || ISNEWLINE(off)) { + if(pivot_line->type == MD_LINE_INDENTEDCODE && n_parents == ctx->n_containers) { + line->type = MD_LINE_INDENTEDCODE; + if(line->indent > ctx->code_indent_offset) + line->indent -= ctx->code_indent_offset; + else + line->indent = 0; + ctx->last_line_has_list_loosening_effect = FALSE; + } else { + line->type = MD_LINE_BLANK; + ctx->last_line_has_list_loosening_effect = (n_parents > 0 && + n_brothers + n_children == 0 && + ctx->containers[n_parents-1].ch != _T('>')); + + #if 1 + /* See https://github.com/mity/md4c/issues/6 + * + * This ugly checking tests we are in (yet empty) list item but + * not its very first line (i.e. not the line with the list + * item mark). + * + * If we are such a blank line, then any following non-blank + * line which would be part of the list item actually has to + * end the list because according to the specification, "a list + * item can begin with at most one blank line." + */ + if(n_parents > 0 && ctx->containers[n_parents-1].ch != _T('>') && + n_brothers + n_children == 0 && ctx->current_block == NULL && + ctx->n_block_bytes > (int) sizeof(MD_BLOCK)) + { + MD_BLOCK* top_block = (MD_BLOCK*) ((char*)ctx->block_bytes + ctx->n_block_bytes - sizeof(MD_BLOCK)); + if(top_block->type == MD_BLOCK_LI) + ctx->last_list_item_starts_with_two_blank_lines = TRUE; + } + #endif + } + break; + } else { + #if 1 + /* This is the 2nd half of the hack. If the flag is set (i.e. there + * was a 2nd blank line at the beginning of the list item) and if + * we would otherwise still belong to the list item, we enforce + * the end of the list. */ + ctx->last_line_has_list_loosening_effect = FALSE; + if(ctx->last_list_item_starts_with_two_blank_lines) { + if(n_parents > 0 && ctx->containers[n_parents-1].ch != _T('>') && + n_brothers + n_children == 0 && ctx->current_block == NULL && + ctx->n_block_bytes > (int) sizeof(MD_BLOCK)) + { + MD_BLOCK* top_block = (MD_BLOCK*) ((char*)ctx->block_bytes + ctx->n_block_bytes - sizeof(MD_BLOCK)); + if(top_block->type == MD_BLOCK_LI) + n_parents--; + } + + ctx->last_list_item_starts_with_two_blank_lines = FALSE; + } + #endif + } + + /* Check whether we are Setext underline. */ + if(line->indent < ctx->code_indent_offset && pivot_line->type == MD_LINE_TEXT + && off < ctx->size && ISANYOF2(off, _T('='), _T('-')) + && (n_parents == ctx->n_containers)) + { + unsigned level; + + if(md_is_setext_underline(ctx, off, &off, &level)) { + line->type = MD_LINE_SETEXTUNDERLINE; + line->data = level; + break; + } + } + + /* Check for thematic break line. */ + if(line->indent < ctx->code_indent_offset + && off < ctx->size && off >= hr_killer + && ISANYOF(off, _T("-_*"))) + { + if(md_is_hr_line(ctx, off, &off, &hr_killer)) { + line->type = MD_LINE_HR; + break; + } + } + + /* Check for "brother" container. I.e. whether we are another list item + * in already started list. */ + if(n_parents < ctx->n_containers && n_brothers + n_children == 0) { + OFF tmp; + + if(md_is_container_mark(ctx, line->indent, off, &tmp, &container) && + md_is_container_compatible(&ctx->containers[n_parents], &container)) + { + pivot_line = &md_dummy_blank_line; + + off = tmp; + + total_indent += container.contents_indent - container.mark_indent; + line->indent = md_line_indentation(ctx, total_indent, off, &off); + total_indent += line->indent; + line->beg = off; + + /* Some of the following whitespace actually still belongs to the mark. */ + if(off >= ctx->size || ISNEWLINE(off)) { + container.contents_indent++; + } else if(line->indent <= ctx->code_indent_offset) { + container.contents_indent += line->indent; + line->indent = 0; + } else { + container.contents_indent += 1; + line->indent--; + } + + ctx->containers[n_parents].mark_indent = container.mark_indent; + ctx->containers[n_parents].contents_indent = container.contents_indent; + + n_brothers++; + continue; + } + } + + /* Check for indented code. + * Note indented code block cannot interrupt a paragraph. */ + if(line->indent >= ctx->code_indent_offset && + (pivot_line->type == MD_LINE_BLANK || pivot_line->type == MD_LINE_INDENTEDCODE)) + { + line->type = MD_LINE_INDENTEDCODE; + MD_ASSERT(line->indent >= ctx->code_indent_offset); + line->indent -= ctx->code_indent_offset; + line->data = 0; + break; + } + + /* Check for start of a new container block. */ + if(line->indent < ctx->code_indent_offset && + md_is_container_mark(ctx, line->indent, off, &off, &container)) + { + if(pivot_line->type == MD_LINE_TEXT && n_parents == ctx->n_containers && + (off >= ctx->size || ISNEWLINE(off)) && container.ch != _T('>')) + { + /* Noop. List mark followed by a blank line cannot interrupt a paragraph. */ + } else if(pivot_line->type == MD_LINE_TEXT && n_parents == ctx->n_containers && + ISANYOF2_(container.ch, _T('.'), _T(')')) && container.start != 1) + { + /* Noop. Ordered list cannot interrupt a paragraph unless the start index is 1. */ + } else { + total_indent += container.contents_indent - container.mark_indent; + line->indent = md_line_indentation(ctx, total_indent, off, &off); + total_indent += line->indent; + + line->beg = off; + line->data = container.ch; + + /* Some of the following whitespace actually still belongs to the mark. */ + if(off >= ctx->size || ISNEWLINE(off)) { + container.contents_indent++; + } else if(line->indent <= ctx->code_indent_offset) { + container.contents_indent += line->indent; + line->indent = 0; + } else { + container.contents_indent += 1; + line->indent--; + } + + if(n_brothers + n_children == 0) + pivot_line = &md_dummy_blank_line; + + if(n_children == 0) + MD_CHECK(md_leave_child_containers(ctx, n_parents + n_brothers)); + + n_children++; + MD_CHECK(md_push_container(ctx, &container)); + continue; + } + } + + /* Check whether we are table continuation. */ + if(pivot_line->type == MD_LINE_TABLE && n_parents == ctx->n_containers) { + line->type = MD_LINE_TABLE; + break; + } + + /* Check for ATX header. */ + if(line->indent < ctx->code_indent_offset && + off < ctx->size && CH(off) == _T('#')) + { + unsigned level; + + if(md_is_atxheader_line(ctx, off, &line->beg, &off, &level)) { + line->type = MD_LINE_ATXHEADER; + line->data = level; + break; + } + } + + /* Check whether we are starting code fence. */ + if(off < ctx->size && ISANYOF2(off, _T('`'), _T('~'))) { + if(md_is_opening_code_fence(ctx, off, &off)) { + line->type = MD_LINE_FENCEDCODE; + line->data = 1; + break; + } + } + + /* Check for start of raw HTML block. */ + if(off < ctx->size && CH(off) == _T('<') + && !(ctx->parser.flags & MD_FLAG_NOHTMLBLOCKS)) + { + ctx->html_block_type = md_is_html_block_start_condition(ctx, off); + + /* HTML block type 7 cannot interrupt paragraph. */ + if(ctx->html_block_type == 7 && pivot_line->type == MD_LINE_TEXT) + ctx->html_block_type = 0; + + if(ctx->html_block_type > 0) { + /* The line itself also may immediately close the block. */ + if(md_is_html_block_end_condition(ctx, off, &off) == ctx->html_block_type) { + /* Make sure this is the last line of the block. */ + ctx->html_block_type = 0; + } + + line->type = MD_LINE_HTML; + break; + } + } + + /* Check for table underline. */ + if((ctx->parser.flags & MD_FLAG_TABLES) && pivot_line->type == MD_LINE_TEXT + && off < ctx->size && ISANYOF3(off, _T('|'), _T('-'), _T(':')) + && n_parents == ctx->n_containers) + { + unsigned col_count; + + if(ctx->current_block != NULL && ctx->current_block->n_lines == 1 && + md_is_table_underline(ctx, off, &off, &col_count)) + { + line->data = col_count; + line->type = MD_LINE_TABLEUNDERLINE; + break; + } + } + + /* By default, we are normal text line. */ + line->type = MD_LINE_TEXT; + if(pivot_line->type == MD_LINE_TEXT && n_brothers + n_children == 0) { + /* Lazy continuation. */ + n_parents = ctx->n_containers; + } + + /* Check for task mark. */ + if((ctx->parser.flags & MD_FLAG_TASKLISTS) && n_brothers + n_children > 0 && + ISANYOF_(ctx->containers[ctx->n_containers-1].ch, _T("-+*.)"))) + { + OFF tmp = off; + + while(tmp < ctx->size && tmp < off + 3 && ISBLANK(tmp)) + tmp++; + if(tmp + 2 < ctx->size && CH(tmp) == _T('[') && + ISANYOF(tmp+1, _T("xX ")) && CH(tmp+2) == _T(']') && + (tmp + 3 == ctx->size || ISBLANK(tmp+3) || ISNEWLINE(tmp+3))) + { + MD_CONTAINER* task_container = (n_children > 0 ? &ctx->containers[ctx->n_containers-1] : &container); + task_container->is_task = TRUE; + task_container->task_mark_off = tmp + 1; + off = tmp + 3; + while(off < ctx->size && ISWHITESPACE(off)) + off++; + if (off == ctx->size) break; + line->beg = off; + } + } + + break; + } + + /* Scan for end of the line. + * + * Note this is quite a bottleneck of the parsing as we here iterate almost + * over compete document. + */ +#if defined __linux__ && !defined MD4C_USE_UTF16 + /* Recent glibc versions have superbly optimized strcspn(), even using + * vectorization if available. */ + if(ctx->doc_ends_with_newline && off < ctx->size) { + while(TRUE) { + off += (OFF) strcspn(STR(off), "\r\n"); + + /* strcspn() can stop on zero terminator; but that can appear + * anywhere in the Markfown input... */ + if(CH(off) == _T('\0')) + off++; + else + break; + } + } else +#endif + { + /* Optimization: Use some loop unrolling. */ + while(off + 3 < ctx->size && !ISNEWLINE(off+0) && !ISNEWLINE(off+1) + && !ISNEWLINE(off+2) && !ISNEWLINE(off+3)) + off += 4; + while(off < ctx->size && !ISNEWLINE(off)) + off++; + } + + /* Set end of the line. */ + line->end = off; + + /* But for ATX header, we should exclude the optional trailing mark. */ + if(line->type == MD_LINE_ATXHEADER) { + OFF tmp = line->end; + while(tmp > line->beg && CH(tmp-1) == _T(' ')) + tmp--; + while(tmp > line->beg && CH(tmp-1) == _T('#')) + tmp--; + if(tmp == line->beg || CH(tmp-1) == _T(' ') || (ctx->parser.flags & MD_FLAG_PERMISSIVEATXHEADERS)) + line->end = tmp; + } + + /* Trim trailing spaces. */ + if(line->type != MD_LINE_INDENTEDCODE && line->type != MD_LINE_FENCEDCODE) { + while(line->end > line->beg && CH(line->end-1) == _T(' ')) + line->end--; + } + + /* Eat also the new line. */ + if(off < ctx->size && CH(off) == _T('\r')) + off++; + if(off < ctx->size && CH(off) == _T('\n')) + off++; + + *p_end = off; + + /* If we belong to a list after seeing a blank line, the list is loose. */ + if(prev_line_has_list_loosening_effect && line->type != MD_LINE_BLANK && n_parents + n_brothers > 0) { + MD_CONTAINER* c = &ctx->containers[n_parents + n_brothers - 1]; + if(c->ch != _T('>')) { + MD_BLOCK* block = (MD_BLOCK*) (((char*)ctx->block_bytes) + c->block_byte_off); + block->flags |= MD_BLOCK_LOOSE_LIST; + } + } + + /* Leave any containers we are not part of anymore. */ + if(n_children == 0 && n_parents + n_brothers < ctx->n_containers) + MD_CHECK(md_leave_child_containers(ctx, n_parents + n_brothers)); + + /* Enter any container we found a mark for. */ + if(n_brothers > 0) { + MD_ASSERT(n_brothers == 1); + MD_CHECK(md_push_container_bytes(ctx, MD_BLOCK_LI, + ctx->containers[n_parents].task_mark_off, + (ctx->containers[n_parents].is_task ? CH(ctx->containers[n_parents].task_mark_off) : 0), + MD_BLOCK_CONTAINER_CLOSER)); + MD_CHECK(md_push_container_bytes(ctx, MD_BLOCK_LI, + container.task_mark_off, + (container.is_task ? CH(container.task_mark_off) : 0), + MD_BLOCK_CONTAINER_OPENER)); + ctx->containers[n_parents].is_task = container.is_task; + ctx->containers[n_parents].task_mark_off = container.task_mark_off; + } + + if(n_children > 0) + MD_CHECK(md_enter_child_containers(ctx, n_children)); + +abort: + return ret; +} + +static int +md_process_line(MD_CTX* ctx, const MD_LINE_ANALYSIS** p_pivot_line, MD_LINE_ANALYSIS* line) +{ + const MD_LINE_ANALYSIS* pivot_line = *p_pivot_line; + int ret = 0; + + /* Blank line ends current leaf block. */ + if(line->type == MD_LINE_BLANK) { + MD_CHECK(md_end_current_block(ctx)); + *p_pivot_line = &md_dummy_blank_line; + return 0; + } + + /* Some line types form block on their own. */ + if(line->type == MD_LINE_HR || line->type == MD_LINE_ATXHEADER) { + MD_CHECK(md_end_current_block(ctx)); + + /* Add our single-line block. */ + MD_CHECK(md_start_new_block(ctx, line)); + MD_CHECK(md_add_line_into_current_block(ctx, line)); + MD_CHECK(md_end_current_block(ctx)); + *p_pivot_line = &md_dummy_blank_line; + return 0; + } + + /* MD_LINE_SETEXTUNDERLINE changes meaning of the current block and ends it. */ + if(line->type == MD_LINE_SETEXTUNDERLINE) { + MD_ASSERT(ctx->current_block != NULL); + ctx->current_block->type = MD_BLOCK_H; + ctx->current_block->data = line->data; + ctx->current_block->flags |= MD_BLOCK_SETEXT_HEADER; + MD_CHECK(md_add_line_into_current_block(ctx, line)); + MD_CHECK(md_end_current_block(ctx)); + if(ctx->current_block == NULL) { + *p_pivot_line = &md_dummy_blank_line; + } else { + /* This happens if we have consumed all the body as link ref. defs. + * and downgraded the underline into start of a new paragraph block. */ + line->type = MD_LINE_TEXT; + *p_pivot_line = line; + } + return 0; + } + + /* MD_LINE_TABLEUNDERLINE changes meaning of the current block. */ + if(line->type == MD_LINE_TABLEUNDERLINE) { + MD_ASSERT(ctx->current_block != NULL); + MD_ASSERT(ctx->current_block->n_lines == 1); + ctx->current_block->type = MD_BLOCK_TABLE; + ctx->current_block->data = line->data; + MD_ASSERT(pivot_line != &md_dummy_blank_line); + ((MD_LINE_ANALYSIS*)pivot_line)->type = MD_LINE_TABLE; + MD_CHECK(md_add_line_into_current_block(ctx, line)); + return 0; + } + + /* The current block also ends if the line has different type. */ + if(line->type != pivot_line->type) + MD_CHECK(md_end_current_block(ctx)); + + /* The current line may start a new block. */ + if(ctx->current_block == NULL) { + MD_CHECK(md_start_new_block(ctx, line)); + *p_pivot_line = line; + } + + /* In all other cases the line is just a continuation of the current block. */ + MD_CHECK(md_add_line_into_current_block(ctx, line)); + +abort: + return ret; +} + +static int +md_process_doc(MD_CTX *ctx) +{ + const MD_LINE_ANALYSIS* pivot_line = &md_dummy_blank_line; + MD_LINE_ANALYSIS line_buf[2]; + MD_LINE_ANALYSIS* line = &line_buf[0]; + OFF off = 0; + int ret = 0; + + MD_ENTER_BLOCK(MD_BLOCK_DOC, NULL); + + while(off < ctx->size) { + if(line == pivot_line) + line = (line == &line_buf[0] ? &line_buf[1] : &line_buf[0]); + + MD_CHECK(md_analyze_line(ctx, off, &off, pivot_line, line)); + MD_CHECK(md_process_line(ctx, &pivot_line, line)); + } + + md_end_current_block(ctx); + + MD_CHECK(md_build_ref_def_hashtable(ctx)); + + /* Process all blocks. */ + MD_CHECK(md_leave_child_containers(ctx, 0)); + MD_CHECK(md_process_all_blocks(ctx)); + + MD_LEAVE_BLOCK(MD_BLOCK_DOC, NULL); + +abort: + +#if 0 + /* Output some memory consumption statistics. */ + { + char buffer[256]; + sprintf(buffer, "Alloced %u bytes for block buffer.", + (unsigned)(ctx->alloc_block_bytes)); + MD_LOG(buffer); + + sprintf(buffer, "Alloced %u bytes for containers buffer.", + (unsigned)(ctx->alloc_containers * sizeof(MD_CONTAINER))); + MD_LOG(buffer); + + sprintf(buffer, "Alloced %u bytes for marks buffer.", + (unsigned)(ctx->alloc_marks * sizeof(MD_MARK))); + MD_LOG(buffer); + + sprintf(buffer, "Alloced %u bytes for aux. buffer.", + (unsigned)(ctx->alloc_buffer * sizeof(MD_CHAR))); + MD_LOG(buffer); + } +#endif + + return ret; +} + + +/******************** + *** Public API *** + ********************/ + +int +md_parse(const MD_CHAR* text, MD_SIZE size, const MD_PARSER* parser, void* userdata) +{ + MD_CTX ctx; + int i; + int ret; + + if(parser->abi_version != 0) { + if(parser->debug_log != NULL) + parser->debug_log("Unsupported abi_version.", userdata); + return -1; + } + + /* Setup context structure. */ + memset(&ctx, 0, sizeof(MD_CTX)); + ctx.text = text; + ctx.size = size; + memcpy(&ctx.parser, parser, sizeof(MD_PARSER)); + ctx.userdata = userdata; + ctx.code_indent_offset = (ctx.parser.flags & MD_FLAG_NOINDENTEDCODEBLOCKS) ? (OFF)(-1) : 4; + md_build_mark_char_map(&ctx); + ctx.doc_ends_with_newline = (size > 0 && ISNEWLINE_(text[size-1])); + + /* Reset all unresolved opener mark chains. */ + for(i = 0; i < (int) SIZEOF_ARRAY(ctx.mark_chains); i++) { + ctx.mark_chains[i].head = -1; + ctx.mark_chains[i].tail = -1; + } + ctx.unresolved_link_head = -1; + ctx.unresolved_link_tail = -1; + + /* All the work. */ + ret = md_process_doc(&ctx); + + /* Clean-up. */ + md_free_ref_defs(&ctx); + md_free_ref_def_hashtable(&ctx); + free(ctx.buffer); + free(ctx.marks); + free(ctx.block_bytes); + free(ctx.containers); + + return ret; +} diff --git a/src/third-party/md4c/md4c.h b/src/third-party/md4c/md4c.h new file mode 100644 index 0000000..95f78f9 --- /dev/null +++ b/src/third-party/md4c/md4c.h @@ -0,0 +1,405 @@ +/* + * MD4C: Markdown parser for C + * (http://github.com/mity/md4c) + * + * Copyright (c) 2016-2020 Martin Mitas + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS + * IN THE SOFTWARE. + */ + +#ifndef MD4C_H +#define MD4C_H + +#ifdef __cplusplus + extern "C" { +#endif + +#if defined MD4C_USE_UTF16 + /* Magic to support UTF-16. Note that in order to use it, you have to define + * the macro MD4C_USE_UTF16 both when building MD4C as well as when + * including this header in your code. */ + #ifdef _WIN32 + #include <windows.h> + typedef WCHAR MD_CHAR; + #else + #error MD4C_USE_UTF16 is only supported on Windows. + #endif +#else + typedef char MD_CHAR; +#endif + +typedef unsigned MD_SIZE; +typedef unsigned MD_OFFSET; + + +/* Block represents a part of document hierarchy structure like a paragraph + * or list item. + */ +typedef enum MD_BLOCKTYPE { + /* <body>...</body> */ + MD_BLOCK_DOC = 0, + + /* <blockquote>...</blockquote> */ + MD_BLOCK_QUOTE, + + /* <ul>...</ul> + * Detail: Structure MD_BLOCK_UL_DETAIL. */ + MD_BLOCK_UL, + + /* <ol>...</ol> + * Detail: Structure MD_BLOCK_OL_DETAIL. */ + MD_BLOCK_OL, + + /* <li>...</li> + * Detail: Structure MD_BLOCK_LI_DETAIL. */ + MD_BLOCK_LI, + + /* <hr> */ + MD_BLOCK_HR, + + /* <h1>...</h1> (for levels up to 6) + * Detail: Structure MD_BLOCK_H_DETAIL. */ + MD_BLOCK_H, + + /* <pre><code>...</code></pre> + * Note the text lines within code blocks are terminated with '\n' + * instead of explicit MD_TEXT_BR. */ + MD_BLOCK_CODE, + + /* Raw HTML block. This itself does not correspond to any particular HTML + * tag. The contents of it _is_ raw HTML source intended to be put + * in verbatim form to the HTML output. */ + MD_BLOCK_HTML, + + /* <p>...</p> */ + MD_BLOCK_P, + + /* <table>...</table> and its contents. + * Detail: Structure MD_BLOCK_TABLE_DETAIL (for MD_BLOCK_TABLE), + * structure MD_BLOCK_TD_DETAIL (for MD_BLOCK_TH and MD_BLOCK_TD) + * Note all of these are used only if extension MD_FLAG_TABLES is enabled. */ + MD_BLOCK_TABLE, + MD_BLOCK_THEAD, + MD_BLOCK_TBODY, + MD_BLOCK_TR, + MD_BLOCK_TH, + MD_BLOCK_TD +} MD_BLOCKTYPE; + +/* Span represents an in-line piece of a document which should be rendered with + * the same font, color and other attributes. A sequence of spans forms a block + * like paragraph or list item. */ +typedef enum MD_SPANTYPE { + /* <em>...</em> */ + MD_SPAN_EM, + + /* <strong>...</strong> */ + MD_SPAN_STRONG, + + /* <a href="xxx">...</a> + * Detail: Structure MD_SPAN_A_DETAIL. */ + MD_SPAN_A, + + /* <img src="xxx">...</a> + * Detail: Structure MD_SPAN_IMG_DETAIL. + * Note: Image text can contain nested spans and even nested images. + * If rendered into ALT attribute of HTML <IMG> tag, it's responsibility + * of the parser to deal with it. + */ + MD_SPAN_IMG, + + /* <code>...</code> */ + MD_SPAN_CODE, + + /* <del>...</del> + * Note: Recognized only when MD_FLAG_STRIKETHROUGH is enabled. + */ + MD_SPAN_DEL, + + /* For recognizing inline ($) and display ($$) equations + * Note: Recognized only when MD_FLAG_LATEXMATHSPANS is enabled. + */ + MD_SPAN_LATEXMATH, + MD_SPAN_LATEXMATH_DISPLAY, + + /* Wiki links + * Note: Recognized only when MD_FLAG_WIKILINKS is enabled. + */ + MD_SPAN_WIKILINK, + + /* <u>...</u> + * Note: Recognized only when MD_FLAG_UNDERLINE is enabled. */ + MD_SPAN_U +} MD_SPANTYPE; + +/* Text is the actual textual contents of span. */ +typedef enum MD_TEXTTYPE { + /* Normal text. */ + MD_TEXT_NORMAL = 0, + + /* NULL character. CommonMark requires replacing NULL character with + * the replacement char U+FFFD, so this allows caller to do that easily. */ + MD_TEXT_NULLCHAR, + + /* Line breaks. + * Note these are not sent from blocks with verbatim output (MD_BLOCK_CODE + * or MD_BLOCK_HTML). In such cases, '\n' is part of the text itself. */ + MD_TEXT_BR, /* <br> (hard break) */ + MD_TEXT_SOFTBR, /* '\n' in source text where it is not semantically meaningful (soft break) */ + + /* Entity. + * (a) Named entity, e.g. + * (Note MD4C does not have a list of known entities. + * Anything matching the regexp /&[A-Za-z][A-Za-z0-9]{1,47};/ is + * treated as a named entity.) + * (b) Numerical entity, e.g. Ӓ + * (c) Hexadecimal entity, e.g. ካ + * + * As MD4C is mostly encoding agnostic, application gets the verbatim + * entity text into the MD_PARSER::text_callback(). */ + MD_TEXT_ENTITY, + + /* Text in a code block (inside MD_BLOCK_CODE) or inlined code (`code`). + * If it is inside MD_BLOCK_CODE, it includes spaces for indentation and + * '\n' for new lines. MD_TEXT_BR and MD_TEXT_SOFTBR are not sent for this + * kind of text. */ + MD_TEXT_CODE, + + /* Text is a raw HTML. If it is contents of a raw HTML block (i.e. not + * an inline raw HTML), then MD_TEXT_BR and MD_TEXT_SOFTBR are not used. + * The text contains verbatim '\n' for the new lines. */ + MD_TEXT_HTML, + + /* Text is inside an equation. This is processed the same way as inlined code + * spans (`code`). */ + MD_TEXT_LATEXMATH +} MD_TEXTTYPE; + + +/* Alignment enumeration. */ +typedef enum MD_ALIGN { + MD_ALIGN_DEFAULT = 0, /* When unspecified. */ + MD_ALIGN_LEFT, + MD_ALIGN_CENTER, + MD_ALIGN_RIGHT +} MD_ALIGN; + + +/* String attribute. + * + * This wraps strings which are outside of a normal text flow and which are + * propagated within various detailed structures, but which still may contain + * string portions of different types like e.g. entities. + * + * So, for example, lets consider this image: + * + * ![image alt text](http://example.org/image.png 'foo " bar') + * + * The image alt text is propagated as a normal text via the MD_PARSER::text() + * callback. However, the image title ('foo " bar') is propagated as + * MD_ATTRIBUTE in MD_SPAN_IMG_DETAIL::title. + * + * Then the attribute MD_SPAN_IMG_DETAIL::title shall provide the following: + * -- [0]: "foo " (substr_types[0] == MD_TEXT_NORMAL; substr_offsets[0] == 0) + * -- [1]: """ (substr_types[1] == MD_TEXT_ENTITY; substr_offsets[1] == 4) + * -- [2]: " bar" (substr_types[2] == MD_TEXT_NORMAL; substr_offsets[2] == 10) + * -- [3]: (n/a) (n/a ; substr_offsets[3] == 14) + * + * Note that these invariants are always guaranteed: + * -- substr_offsets[0] == 0 + * -- substr_offsets[LAST+1] == size + * -- Currently, only MD_TEXT_NORMAL, MD_TEXT_ENTITY, MD_TEXT_NULLCHAR + * substrings can appear. This could change only of the specification + * changes. + */ +typedef struct MD_ATTRIBUTE { + const MD_CHAR* text; + MD_SIZE size; + const MD_TEXTTYPE* substr_types; + const MD_OFFSET* substr_offsets; +} MD_ATTRIBUTE; + + +/* Detailed info for MD_BLOCK_UL. */ +typedef struct MD_BLOCK_UL_DETAIL { + int is_tight; /* Non-zero if tight list, zero if loose. */ + MD_CHAR mark; /* Item bullet character in MarkDown source of the list, e.g. '-', '+', '*'. */ +} MD_BLOCK_UL_DETAIL; + +/* Detailed info for MD_BLOCK_OL. */ +typedef struct MD_BLOCK_OL_DETAIL { + unsigned start; /* Start index of the ordered list. */ + int is_tight; /* Non-zero if tight list, zero if loose. */ + MD_CHAR mark_delimiter; /* Character delimiting the item marks in MarkDown source, e.g. '.' or ')' */ +} MD_BLOCK_OL_DETAIL; + +/* Detailed info for MD_BLOCK_LI. */ +typedef struct MD_BLOCK_LI_DETAIL { + int is_task; /* Can be non-zero only with MD_FLAG_TASKLISTS */ + MD_CHAR task_mark; /* If is_task, then one of 'x', 'X' or ' '. Undefined otherwise. */ + MD_OFFSET task_mark_offset; /* If is_task, then offset in the input of the char between '[' and ']'. */ +} MD_BLOCK_LI_DETAIL; + +/* Detailed info for MD_BLOCK_H. */ +typedef struct MD_BLOCK_H_DETAIL { + unsigned level; /* Header level (1 - 6) */ +} MD_BLOCK_H_DETAIL; + +/* Detailed info for MD_BLOCK_CODE. */ +typedef struct MD_BLOCK_CODE_DETAIL { + MD_ATTRIBUTE info; + MD_ATTRIBUTE lang; + MD_CHAR fence_char; /* The character used for fenced code block; or zero for indented code block. */ +} MD_BLOCK_CODE_DETAIL; + +/* Detailed info for MD_BLOCK_TABLE. */ +typedef struct MD_BLOCK_TABLE_DETAIL { + unsigned col_count; /* Count of columns in the table. */ + unsigned head_row_count; /* Count of rows in the table header (currently always 1) */ + unsigned body_row_count; /* Count of rows in the table body */ +} MD_BLOCK_TABLE_DETAIL; + +/* Detailed info for MD_BLOCK_TH and MD_BLOCK_TD. */ +typedef struct MD_BLOCK_TD_DETAIL { + MD_ALIGN align; +} MD_BLOCK_TD_DETAIL; + +/* Detailed info for MD_SPAN_A. */ +typedef struct MD_SPAN_A_DETAIL { + MD_ATTRIBUTE href; + MD_ATTRIBUTE title; +} MD_SPAN_A_DETAIL; + +/* Detailed info for MD_SPAN_IMG. */ +typedef struct MD_SPAN_IMG_DETAIL { + MD_ATTRIBUTE src; + MD_ATTRIBUTE title; +} MD_SPAN_IMG_DETAIL; + +/* Detailed info for MD_SPAN_WIKILINK. */ +typedef struct MD_SPAN_WIKILINK { + MD_ATTRIBUTE target; +} MD_SPAN_WIKILINK_DETAIL; + +/* Flags specifying extensions/deviations from CommonMark specification. + * + * By default (when MD_PARSER::flags == 0), we follow CommonMark specification. + * The following flags may allow some extensions or deviations from it. + */ +#define MD_FLAG_COLLAPSEWHITESPACE 0x0001 /* In MD_TEXT_NORMAL, collapse non-trivial whitespace into single ' ' */ +#define MD_FLAG_PERMISSIVEATXHEADERS 0x0002 /* Do not require space in ATX headers ( ###header ) */ +#define MD_FLAG_PERMISSIVEURLAUTOLINKS 0x0004 /* Recognize URLs as autolinks even without '<', '>' */ +#define MD_FLAG_PERMISSIVEEMAILAUTOLINKS 0x0008 /* Recognize e-mails as autolinks even without '<', '>' and 'mailto:' */ +#define MD_FLAG_NOINDENTEDCODEBLOCKS 0x0010 /* Disable indented code blocks. (Only fenced code works.) */ +#define MD_FLAG_NOHTMLBLOCKS 0x0020 /* Disable raw HTML blocks. */ +#define MD_FLAG_NOHTMLSPANS 0x0040 /* Disable raw HTML (inline). */ +#define MD_FLAG_TABLES 0x0100 /* Enable tables extension. */ +#define MD_FLAG_STRIKETHROUGH 0x0200 /* Enable strikethrough extension. */ +#define MD_FLAG_PERMISSIVEWWWAUTOLINKS 0x0400 /* Enable WWW autolinks (even without any scheme prefix, if they begin with 'www.') */ +#define MD_FLAG_TASKLISTS 0x0800 /* Enable task list extension. */ +#define MD_FLAG_LATEXMATHSPANS 0x1000 /* Enable $ and $$ containing LaTeX equations. */ +#define MD_FLAG_WIKILINKS 0x2000 /* Enable wiki links extension. */ +#define MD_FLAG_UNDERLINE 0x4000 /* Enable underline extension (and disables '_' for normal emphasis). */ + +#define MD_FLAG_PERMISSIVEAUTOLINKS (MD_FLAG_PERMISSIVEEMAILAUTOLINKS | MD_FLAG_PERMISSIVEURLAUTOLINKS | MD_FLAG_PERMISSIVEWWWAUTOLINKS) +#define MD_FLAG_NOHTML (MD_FLAG_NOHTMLBLOCKS | MD_FLAG_NOHTMLSPANS) + +/* Convenient sets of flags corresponding to well-known Markdown dialects. + * + * Note we may only support subset of features of the referred dialect. + * The constant just enables those extensions which bring us as close as + * possible given what features we implement. + * + * ABI compatibility note: Meaning of these can change in time as new + * extensions, bringing the dialect closer to the original, are implemented. + */ +#define MD_DIALECT_COMMONMARK 0 +#define MD_DIALECT_GITHUB (MD_FLAG_PERMISSIVEAUTOLINKS | MD_FLAG_TABLES | MD_FLAG_STRIKETHROUGH | MD_FLAG_TASKLISTS) + +/* Parser structure. + */ +typedef struct MD_PARSER { + /* Reserved. Set to zero. + */ + unsigned abi_version; + + /* Dialect options. Bitmask of MD_FLAG_xxxx values. + */ + unsigned flags; + + /* Caller-provided rendering callbacks. + * + * For some block/span types, more detailed information is provided in a + * type-specific structure pointed by the argument 'detail'. + * + * The last argument of all callbacks, 'userdata', is just propagated from + * md_parse() and is available for any use by the application. + * + * Note any strings provided to the callbacks as their arguments or as + * members of any detail structure are generally not zero-terminated. + * Application has to take the respective size information into account. + * + * Any rendering callback may abort further parsing of the document by + * returning non-zero. + */ + int (*enter_block)(MD_BLOCKTYPE /*type*/, void* /*detail*/, void* /*userdata*/); + int (*leave_block)(MD_BLOCKTYPE /*type*/, void* /*detail*/, void* /*userdata*/); + + int (*enter_span)(MD_SPANTYPE /*type*/, void* /*detail*/, void* /*userdata*/); + int (*leave_span)(MD_SPANTYPE /*type*/, void* /*detail*/, void* /*userdata*/); + + int (*text)(MD_TEXTTYPE /*type*/, const MD_CHAR* /*text*/, MD_SIZE /*size*/, void* /*userdata*/); + + /* Debug callback. Optional (may be NULL). + * + * If provided and something goes wrong, this function gets called. + * This is intended for debugging and problem diagnosis for developers; + * it is not intended to provide any errors suitable for displaying to an + * end user. + */ + void (*debug_log)(const char* /*msg*/, void* /*userdata*/); + + /* Reserved. Set to NULL. + */ + void (*syntax)(void); +} MD_PARSER; + + +/* For backward compatibility. Do not use in new code. + */ +typedef MD_PARSER MD_RENDERER; + + +/* Parse the Markdown document stored in the string 'text' of size 'size'. + * The parser provides callbacks to be called during the parsing so the + * caller can render the document on the screen or convert the Markdown + * to another format. + * + * Zero is returned on success. If a runtime error occurs (e.g. a memory + * fails), -1 is returned. If the processing is aborted due any callback + * returning non-zero, the return value of the callback is returned. + */ +int md_parse(const MD_CHAR* text, MD_SIZE size, const MD_PARSER* parser, void* userdata); + + +#ifdef __cplusplus + } /* extern "C" { */ +#endif + +#endif /* MD4C_H */ |