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Diffstat (limited to 'intl/icu/source/i18n/regeximp.h')
| -rw-r--r-- | intl/icu/source/i18n/regeximp.h | 414 |
1 files changed, 414 insertions, 0 deletions
diff --git a/intl/icu/source/i18n/regeximp.h b/intl/icu/source/i18n/regeximp.h new file mode 100644 index 0000000000..446cd90747 --- /dev/null +++ b/intl/icu/source/i18n/regeximp.h @@ -0,0 +1,414 @@ +// © 2016 and later: Unicode, Inc. and others. +// License & terms of use: http://www.unicode.org/copyright.html +// +// Copyright (C) 2002-2015 International Business Machines Corporation +// and others. All rights reserved. +// +// file: regeximp.h +// +// ICU Regular Expressions, +// Definitions of constant values used in the compiled form of +// a regular expression pattern. +// + +#ifndef _REGEXIMP_H +#define _REGEXIMP_H + +#include "unicode/utypes.h" +#include "unicode/uobject.h" +#include "unicode/uniset.h" +#include "unicode/utext.h" + +#include "cmemory.h" +#include "ucase.h" + +U_NAMESPACE_BEGIN + +// For debugging, define REGEX_DEBUG +// To define with configure, +// CPPFLAGS="-DREGEX_DEBUG" ./runConfigureICU --enable-debug --disable-release Linux + +#ifdef REGEX_DEBUG +// +// debugging options. Enable one or more of the three #defines immediately following +// + +//#define REGEX_SCAN_DEBUG +#define REGEX_DUMP_DEBUG +#define REGEX_RUN_DEBUG + +// End of #defines intended to be directly set. + +#include <stdio.h> +#endif + +#ifdef REGEX_SCAN_DEBUG +#define REGEX_SCAN_DEBUG_PRINTF(a) printf a +#else +#define REGEX_SCAN_DEBUG_PRINTF(a) +#endif + + +// +// Opcode types In the compiled form of the regexp, these are the type, or opcodes, +// of the entries. +// +enum { + URX_RESERVED_OP = 0, // For multi-operand ops, most non-first words. + URX_RESERVED_OP_N = 255, // For multi-operand ops, negative operand values. + URX_BACKTRACK = 1, // Force a backtrack, as if a match test had failed. + URX_END = 2, + URX_ONECHAR = 3, // Value field is the 21 bit unicode char to match + URX_STRING = 4, // Value field is index of string start + URX_STRING_LEN = 5, // Value field is string length (code units) + URX_STATE_SAVE = 6, // Value field is pattern position to push + URX_NOP = 7, + URX_START_CAPTURE = 8, // Value field is capture group number. + URX_END_CAPTURE = 9, // Value field is capture group number + URX_STATIC_SETREF = 10, // Value field is index of set in array of sets. + URX_SETREF = 11, // Value field is index of set in array of sets. + URX_DOTANY = 12, + URX_JMP = 13, // Value field is destination position in + // the pattern. + URX_FAIL = 14, // Stop match operation, No match. + + URX_JMP_SAV = 15, // Operand: JMP destination location + URX_BACKSLASH_B = 16, // Value field: 0: \b 1: \B + URX_BACKSLASH_G = 17, + URX_JMP_SAV_X = 18, // Conditional JMP_SAV, + // Used in (x)+, breaks loop on zero length match. + // Operand: Jmp destination. + URX_BACKSLASH_X = 19, + URX_BACKSLASH_Z = 20, // \z Unconditional end of line. + + URX_DOTANY_ALL = 21, // ., in the . matches any mode. + URX_BACKSLASH_D = 22, // Value field: 0: \d 1: \D + URX_CARET = 23, // Value field: 1: multi-line mode. + URX_DOLLAR = 24, // Also for \Z + + URX_CTR_INIT = 25, // Counter Inits for {Interval} loops. + URX_CTR_INIT_NG = 26, // 2 kinds, normal and non-greedy. + // These are 4 word opcodes. See description. + // First Operand: Data loc of counter variable + // 2nd Operand: Pat loc of the URX_CTR_LOOPx + // at the end of the loop. + // 3rd Operand: Minimum count. + // 4th Operand: Max count, -1 for unbounded. + + URX_DOTANY_UNIX = 27, // '.' operator in UNIX_LINES mode, only \n marks end of line. + + URX_CTR_LOOP = 28, // Loop Ops for {interval} loops. + URX_CTR_LOOP_NG = 29, // Also in three flavors. + // Operand is loc of corresponding CTR_INIT. + + URX_CARET_M_UNIX = 30, // '^' operator, test for start of line in multi-line + // plus UNIX_LINES mode. + + URX_RELOC_OPRND = 31, // Operand value in multi-operand ops that refers + // back into compiled pattern code, and thus must + // be relocated when inserting/deleting ops in code. + + URX_STO_SP = 32, // Store the stack ptr. Operand is location within + // matcher data (not stack data) to store it. + URX_LD_SP = 33, // Load the stack pointer. Operand is location + // to load from. + URX_BACKREF = 34, // Back Reference. Parameter is the index of the + // capture group variables in the state stack frame. + URX_STO_INP_LOC = 35, // Store the input location. Operand is location + // within the matcher stack frame. + URX_JMPX = 36, // Conditional JMP. + // First Operand: JMP target location. + // Second Operand: Data location containing an + // input position. If current input position == + // saved input position, FAIL rather than taking + // the JMP + URX_LA_START = 37, // Starting a LookAround expression. + // Save InputPos, SP and active region in static data. + // Operand: Static data offset for the save + URX_LA_END = 38, // Ending a Lookaround expression. + // Restore InputPos and Stack to saved values. + // Operand: Static data offset for saved data. + URX_ONECHAR_I = 39, // Test for case-insensitive match of a literal character. + // Operand: the literal char. + URX_STRING_I = 40, // Case insensitive string compare. + // First Operand: Index of start of string in string literals + // Second Operand (next word in compiled code): + // the length of the string. + URX_BACKREF_I = 41, // Case insensitive back reference. + // Parameter is the index of the + // capture group variables in the state stack frame. + URX_DOLLAR_M = 42, // $ in multi-line mode. + URX_CARET_M = 43, // ^ in multi-line mode. + URX_LB_START = 44, // LookBehind Start. + // Parameter is data location + URX_LB_CONT = 45, // LookBehind Continue. + // Param 0: the data location + // Param 1: The minimum length of the look-behind match + // Param 2: The max length of the look-behind match + URX_LB_END = 46, // LookBehind End. + // Parameter is the data location. + // Check that match ended at the right spot, + // Restore original input string len. + URX_LBN_CONT = 47, // Negative LookBehind Continue + // Param 0: the data location + // Param 1: The minimum length of the look-behind match + // Param 2: The max length of the look-behind match + // Param 3: The pattern loc following the look-behind block. + URX_LBN_END = 48, // Negative LookBehind end + // Parameter is the data location. + // Check that the match ended at the right spot. + URX_STAT_SETREF_N = 49, // Reference to a prebuilt set (e.g. \w), negated + // Operand is index of set in array of sets. + URX_LOOP_SR_I = 50, // Init a [set]* loop. + // Operand is the sets index in array of user sets. + URX_LOOP_C = 51, // Continue a [set]* or OneChar* loop. + // Operand is a matcher static data location. + // Must always immediately follow LOOP_x_I instruction. + URX_LOOP_DOT_I = 52, // .*, initialization of the optimized loop. + // Operand value: + // bit 0: + // 0: Normal (. doesn't match new-line) mode. + // 1: . matches new-line mode. + // bit 1: controls what new-lines are recognized by this operation. + // 0: All Unicode New-lines + // 1: UNIX_LINES, \u000a only. + URX_BACKSLASH_BU = 53, // \b or \B in UREGEX_UWORD mode, using Unicode style + // word boundaries. + URX_DOLLAR_D = 54, // $ end of input test, in UNIX_LINES mode. + URX_DOLLAR_MD = 55, // $ end of input test, in MULTI_LINE and UNIX_LINES mode. + URX_BACKSLASH_H = 56, // Value field: 0: \h 1: \H + URX_BACKSLASH_R = 57, // Any line break sequence. + URX_BACKSLASH_V = 58 // Value field: 0: \v 1: \V + +}; + +// Keep this list of opcode names in sync with the above enum +// Used for debug printing only. +#define URX_OPCODE_NAMES \ + " ", \ + "BACKTRACK", \ + "END", \ + "ONECHAR", \ + "STRING", \ + "STRING_LEN", \ + "STATE_SAVE", \ + "NOP", \ + "START_CAPTURE", \ + "END_CAPTURE", \ + "URX_STATIC_SETREF", \ + "SETREF", \ + "DOTANY", \ + "JMP", \ + "FAIL", \ + "JMP_SAV", \ + "BACKSLASH_B", \ + "BACKSLASH_G", \ + "JMP_SAV_X", \ + "BACKSLASH_X", \ + "BACKSLASH_Z", \ + "DOTANY_ALL", \ + "BACKSLASH_D", \ + "CARET", \ + "DOLLAR", \ + "CTR_INIT", \ + "CTR_INIT_NG", \ + "DOTANY_UNIX", \ + "CTR_LOOP", \ + "CTR_LOOP_NG", \ + "URX_CARET_M_UNIX", \ + "RELOC_OPRND", \ + "STO_SP", \ + "LD_SP", \ + "BACKREF", \ + "STO_INP_LOC", \ + "JMPX", \ + "LA_START", \ + "LA_END", \ + "ONECHAR_I", \ + "STRING_I", \ + "BACKREF_I", \ + "DOLLAR_M", \ + "CARET_M", \ + "LB_START", \ + "LB_CONT", \ + "LB_END", \ + "LBN_CONT", \ + "LBN_END", \ + "STAT_SETREF_N", \ + "LOOP_SR_I", \ + "LOOP_C", \ + "LOOP_DOT_I", \ + "BACKSLASH_BU", \ + "DOLLAR_D", \ + "DOLLAR_MD", \ + "URX_BACKSLASH_H", \ + "URX_BACKSLASH_R", \ + "URX_BACKSLASH_V" + + +// +// Convenience macros for assembling and disassembling a compiled operation. +// +#define URX_TYPE(x) ((uint32_t)(x) >> 24) +#define URX_VAL(x) ((x) & 0xffffff) + + +// +// Access to Unicode Sets composite character properties +// The sets are accessed by the match engine for things like \w (word boundary) +// +enum { + URX_ISWORD_SET = 1, + URX_ISALNUM_SET = 2, + URX_ISALPHA_SET = 3, + URX_ISSPACE_SET = 4, + + URX_GC_NORMAL, // Sets for finding grapheme cluster boundaries. + URX_GC_EXTEND, + URX_GC_CONTROL, + URX_GC_L, + URX_GC_LV, + URX_GC_LVT, + URX_GC_V, + URX_GC_T, + + URX_LAST_SET, + + URX_NEG_SET = 0x800000 // Flag bit to reverse sense of set + // membership test. +}; + + +// +// Match Engine State Stack Frame Layout. +// +struct REStackFrame { + // Header + int64_t fInputIdx; // Position of next character in the input string + int64_t fPatIdx; // Position of next Op in the compiled pattern + // (int64_t for UVector64, values fit in an int32_t) + // Remainder + int64_t fExtra[1]; // Extra state, for capture group start/ends + // atomic parentheses, repeat counts, etc. + // Locations assigned at pattern compile time. + // Variable-length array. +}; +// number of UVector elements in the header +#define RESTACKFRAME_HDRCOUNT 2 + +// +// Start-Of-Match type. Used by find() to quickly scan to positions where a +// match might start before firing up the full match engine. +// +enum StartOfMatch { + START_NO_INFO, // No hint available. + START_CHAR, // Match starts with a literal code point. + START_SET, // Match starts with something matching a set. + START_START, // Match starts at start of buffer only (^ or \A) + START_LINE, // Match starts with ^ in multi-line mode. + START_STRING // Match starts with a literal string. +}; + +#define START_OF_MATCH_STR(v) ((v)==START_NO_INFO? "START_NO_INFO" : \ + (v)==START_CHAR? "START_CHAR" : \ + (v)==START_SET? "START_SET" : \ + (v)==START_START? "START_START" : \ + (v)==START_LINE? "START_LINE" : \ + (v)==START_STRING? "START_STRING" : \ + "ILLEGAL") + +// +// 8 bit set, to fast-path latin-1 set membership tests. +// +struct Regex8BitSet : public UMemory { + inline Regex8BitSet(); + inline void operator = (const Regex8BitSet &s); + inline void init(const UnicodeSet *src); + inline UBool contains(UChar32 c); + inline void add(UChar32 c); + int8_t d[32]; +}; + +inline Regex8BitSet::Regex8BitSet() { + uprv_memset(d, 0, sizeof(d)); +} + +inline UBool Regex8BitSet::contains(UChar32 c) { + // No bounds checking! This is deliberate. + return ((d[c>>3] & 1 <<(c&7)) != 0); +} + +inline void Regex8BitSet::add(UChar32 c) { + d[c>>3] |= 1 << (c&7); +} + +inline void Regex8BitSet::init(const UnicodeSet *s) { + if (s != nullptr) { + for (int32_t i=0; i<=255; i++) { + if (s->contains(i)) { + this->add(i); + } + } + } +} + +inline void Regex8BitSet::operator = (const Regex8BitSet &s) { + uprv_memcpy(d, s.d, sizeof(d)); +} + + +// Case folded UText Iterator helper class. +// Wraps a UText, provides a case-folded enumeration over its contents. +// Used in implementing case insensitive matching constructs. +// Implementation in rematch.cpp + +class CaseFoldingUTextIterator: public UMemory { + public: + CaseFoldingUTextIterator(UText &text); + ~CaseFoldingUTextIterator(); + + UChar32 next(); // Next case folded character + + UBool inExpansion(); // True if last char returned from next() and the + // next to be returned both originated from a string + // folding of the same code point from the original UText. + private: + UText &fUText; + const char16_t *fFoldChars; + int32_t fFoldLength; + int32_t fFoldIndex; + +}; + + +// Case folded char16_t * string iterator. +// Wraps a char16_t *, provides a case-folded enumeration over its contents. +// Used in implementing case insensitive matching constructs. +// Implementation in rematch.cpp + +class CaseFoldingUCharIterator: public UMemory { + public: + CaseFoldingUCharIterator(const char16_t *chars, int64_t start, int64_t limit); + ~CaseFoldingUCharIterator(); + + UChar32 next(); // Next case folded character + + UBool inExpansion(); // True if last char returned from next() and the + // next to be returned both originated from a string + // folding of the same code point from the original UText. + + int64_t getIndex(); // Return the current input buffer index. + + private: + const char16_t *fChars; + int64_t fIndex; + int64_t fLimit; + const char16_t *fFoldChars; + int32_t fFoldLength; + int32_t fFoldIndex; + +}; + +U_NAMESPACE_END +#endif + |