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Diffstat (limited to '')
| -rw-r--r-- | WWW/Library/Implementation/HTPlain.c | 601 |
1 files changed, 601 insertions, 0 deletions
diff --git a/WWW/Library/Implementation/HTPlain.c b/WWW/Library/Implementation/HTPlain.c new file mode 100644 index 0000000..ff52731 --- /dev/null +++ b/WWW/Library/Implementation/HTPlain.c @@ -0,0 +1,601 @@ +/* + * $LynxId: HTPlain.c,v 1.61 2020/01/21 22:05:46 tom Exp $ + * + * Plain text object HTWrite.c + * ================= + * + * This version of the stream object just writes to a socket. + * The socket is assumed open and left open. + * + * Bugs: + * strings written must be less than buffer size. + */ + +#define HTSTREAM_INTERNAL 1 + +#include <HTUtils.h> +#include <LYCharVals.h> /* S/390 -- gil -- 0288 */ + +#include <HTPlain.h> + +#include <HTChunk.h> +#include <HText.h> +#include <HTStyle.h> +#define Lynx_HTML_Handler +#include <HTML.h> /* styles[] */ + +#define BUFFER_SIZE 4096; /* Tradeoff */ + +#include <HTMLDTD.h> +#include <HTCJK.h> +#include <UCMap.h> +#include <UCDefs.h> +#include <UCAux.h> + +#include <LYCharSets.h> +#include <LYStrings.h> +#include <LYLeaks.h> + +static int HTPlain_lastraw = -1; +static int HTPlain_bs_pending = 0; /* 1:bs 2:underline 3:underline+bs - kw */ + +/* HTML Object + * ----------- + */ +struct _HTStream { + const HTStreamClass *isa; + HText *text; + /* + * The node_anchor UCInfo and handle for the input (PARSER) stage. - FM + */ + LYUCcharset *inUCI; + int inUCLYhndl; + /* + * The node_anchor UCInfo and handle for the output (HTEXT) stage. - FM + */ + LYUCcharset *outUCI; + int outUCLYhndl; + + UTFDecodeState U; + UCTransParams T; +}; + +static char replace_buf[64]; /* buffer for replacement strings */ + +static void HTPlain_getChartransInfo(HTStream *me, HTParentAnchor *anchor) +{ + if (me->inUCLYhndl < 0) { + HTAnchor_copyUCInfoStage(anchor, UCT_STAGE_PARSER, UCT_STAGE_MIME, + UCT_SETBY_PARSER); + me->inUCLYhndl = HTAnchor_getUCLYhndl(anchor, UCT_STAGE_PARSER); + } + if (me->outUCLYhndl < 0) { + int chndl = HTAnchor_getUCLYhndl(anchor, UCT_STAGE_HTEXT); + + if (chndl < 0) { + chndl = current_char_set; + HTAnchor_setUCInfoStage(anchor, chndl, + UCT_STAGE_HTEXT, UCT_SETBY_DEFAULT); + } + HTAnchor_setUCInfoStage(anchor, chndl, + UCT_STAGE_HTEXT, UCT_SETBY_DEFAULT); + me->outUCLYhndl = HTAnchor_getUCLYhndl(anchor, UCT_STAGE_HTEXT); + } + me->inUCI = HTAnchor_getUCInfoStage(anchor, UCT_STAGE_PARSER); + me->outUCI = HTAnchor_getUCInfoStage(anchor, UCT_STAGE_HTEXT); +} + +/* Write the buffer out to the socket + * ---------------------------------- + */ + +/*_________________________________________________________________________ + * + * A C T I O N R O U T I N E S + */ + +static void HTPlain_write(HTStream *me, const char *s, + int l); + +/* Character handling + * ------------------ + */ +static void HTPlain_put_character(HTStream *me, int c) +{ +#ifdef REMOVE_CR_ONLY + /* + * Throw away \r's. + */ + if (c != '\r') { + HText_appendCharacter(me->text, c); + } +#else + /* + * See HTPlain_write() for explanations of the following code (we've been + * called via HTPlain_put_string() to do for each character of a terminated + * string what HTPlain_write() does via a while loop for each character in + * a stream of given length). - FM + */ + if ((HTPlain_lastraw == '\r') && c == '\n') { + HTPlain_lastraw = -1; + return; + } + if (c == '\b' || c == '_' || HTPlain_bs_pending) { + char temp[1]; + + temp[0] = (char) c; + HTPlain_write(me, temp, 1); + return; + } + HTPlain_lastraw = UCH(c); + if (c == '\r') { + HText_appendCharacter(me->text, '\n'); + } else if (TOASCII(UCH(c)) >= 127) { /* S/390 -- gil -- 0305 */ + char temp[1]; + + temp[0] = (char) c; + /* + * For now, don't repeat everything here that has been done below - KW + */ + HTPlain_write(me, temp, 1); + } else if (IS_CJK_TTY) { + HText_appendCharacter(me->text, c); + } else if (TOASCII(UCH(c)) >= 127 && TOASCII(UCH(c)) < 161 && + HTPassHighCtrlRaw) { + HText_appendCharacter(me->text, c); +#if CH_NBSP < 127 + } else if (UCH(c) == CH_NBSP) { /* S/390 -- gil -- 0341 */ + HText_appendCharacter(me->text, ' '); +#endif +#if CH_SHY < 127 + } else if (UCH(c) == CH_SHY) { + return; +#endif + } else if ((UCH(c) >= ' ' && TOASCII(UCH(c)) < 127) || + c == '\n' || c == '\t') { + HText_appendCharacter(me->text, c); + } +#endif /* REMOVE_CR_ONLY */ +} + +/* String handling + * --------------- + * + */ +static void HTPlain_put_string(HTStream *me, const char *s) +{ +#ifdef REMOVE_CR_ONLY + HText_appendText(me->text, s); +#else + const char *p; + + if (s == NULL) + return; + for (p = s; *p; p++) { + HTPlain_put_character(me, *p); + } +#endif /* REMOVE_CR_ONLY */ +} + +/* + * Entry function for displayed text/plain and WWW_SOURCE strings. - FM + * --------------------------------------------------------------- + */ +static void HTPlain_write(HTStream *me, const char *s, int l) +{ + const char *p; + const char *e = s + l; + int c; + unsigned c_unsign; + BOOL chk; + UCode_t code, uck = -1; + int saved_char_in = '\0'; + + for (p = s; p < e; p++) { +#ifdef REMOVE_CR_ONLY + /* + * Append the whole string, but remove any \r's. - FM + */ + if (*p != '\r') { + HText_appendCharacter(me->text, *p); + } +#else + if (*p == '\b') { + if (HTPlain_lastraw >= UCH(' ') && + HTPlain_lastraw != '\r' && HTPlain_lastraw != '\n') { + if (!HTPlain_bs_pending) { + HTPlain_bs_pending = 1; + continue; + } else if (HTPlain_bs_pending == 2) { + HTPlain_bs_pending = 3; + continue; + } + } + if (HTPlain_bs_pending >= 2) + HText_appendCharacter(me->text, '_'); + HTPlain_bs_pending = 0; + } else if (*p == '_') { + if (!HTPlain_bs_pending) { + HTPlain_bs_pending = 2; + HTPlain_lastraw = UCH(*p); + continue; + } + } + + /* + * Try to handle lone LFs, CRLFs and lone CRs as newline, and to deal + * with control, ASCII, and 8-bit characters based on best guesses of + * what's appropriate. - FM + */ + if ((HTPlain_lastraw == '\r') && *p == '\n') { + HTPlain_lastraw = -1; + continue; + } + + if (HTPlain_bs_pending && + !(UCH(*p) >= ' ' && *p != '\r' && *p != '\n' && + (HTPlain_lastraw == UCH(*p) || + HTPlain_lastraw == UCH('_') || + *p == '_'))) { + if (HTPlain_bs_pending >= 2) + HText_appendCharacter(me->text, '_'); + HTPlain_bs_pending = 0; + } else if (HTPlain_bs_pending == 1) { + HTPlain_bs_pending = 0; + continue; /* ignore last two of "X\bX" or "X\b_" - kw */ + } else if (HTPlain_bs_pending == 3) { + if (*p == '_') { + HTPlain_bs_pending = 2; + continue; /* ignore last two of "_\b_" - kw */ + } else { + HTPlain_bs_pending = 0; + /* ignore first two of "_\bX" - kw */ + } + } else if (HTPlain_bs_pending == 2) { + HText_appendCharacter(me->text, '_'); + if (*p == '_') + continue; /* keep second of "__" pending - kw */ + HTPlain_bs_pending = 0; + } else { + HTPlain_bs_pending = 0; + } + HTPlain_lastraw = UCH(*p); + if (*p == '\r') { + HText_appendCharacter(me->text, '\n'); + continue; + } + /* + * Make sure the character is handled as Unicode whenever that's + * appropriate. - FM + */ + c = *p; + c_unsign = UCH(c); + code = (UCode_t) c_unsign; + saved_char_in = '\0'; + /* + * Combine any UTF-8 multibytes into Unicode to check for special + * characters. - FM, TD + */ + if (me->T.decode_utf8) { + switch (HTDecodeUTF8(&(me->U), &c, &code)) { + case dUTF8_ok: + if (code < 256) { + c = FROMASCII((char) code); + c_unsign = UCH(c); + } + break; + case dUTF8_err: + code = UCS_REPL; + strcpy(me->U.utf_buf, "\357\277\275"); + me->U.utf_buf_p = (me->U.utf_buf + 3); + break; + case dUTF8_more: + continue; + } + } + /* + * Convert characters from non-UTF-8 charsets to Unicode (if + * appropriate). - FM + */ + if (!(me->T.decode_utf8 && + UCH(*p) > 127)) { + if (me->T.trans_to_uni && + (TOASCII(code) >= LYlowest_eightbit[me->inUCLYhndl] || /* S/390 -- gil -- 0389 */ + (code < ' ' && code != 0 && + me->T.trans_C0_to_uni))) { + /* + * Convert the octet to Unicode. - FM + */ + code = (UCode_t) UCTransToUni(c, me->inUCLYhndl); + if (code > 0) { + saved_char_in = c; + if (code < 256) { + c = FROMASCII((char) code); + c_unsign = UCH(c); + } + } + } else if (code < 32 && code != 0 && + me->T.trans_C0_to_uni) { + /* + * Quote from SGML.c: + * "This else if may be too ugly to keep. - KW" + */ + if (me->T.trans_from_uni && + (((code = UCTransToUni(c, me->inUCLYhndl)) >= 32) || + (me->T.transp && + (code = UCTransToUni(c, me->inUCLYhndl)) > 0))) { + saved_char_in = c; + if (code < 256) { + c = FROMASCII((char) code); + c_unsign = UCH(c); + } + } else { + uck = -1; + if (me->T.transp) { + uck = UCTransCharStr(replace_buf, 60, c, + me->inUCLYhndl, + me->inUCLYhndl, NO); + } + if (!me->T.transp || uck < 0) { + uck = UCTransCharStr(replace_buf, 60, c, + me->inUCLYhndl, + me->outUCLYhndl, YES); + } + if (uck == 0) { + continue; + } else if (uck < 0) { + me->U.utf_buf[0] = '\0'; + } else { + c = replace_buf[0]; + if (c && replace_buf[1]) { + HText_appendText(me->text, replace_buf); + continue; + } + } + me->U.utf_buf[0] = '\0'; + code = UCH(c); + } /* Next line end of ugly stuff for C0. - KW */ + } else { + me->U.utf_buf[0] = '\0'; + code = UCH(c); + } + } + /* + * At this point we have either code in Unicode (and c in latin1 if + * code is in the latin1 range), or code and c will have to be passed + * raw. + */ + + /* + * If CJK mode is on, we'll assume the document matches the user's + * display character set, and if not, the user should toggle off + * raw/CJK mode to reload. - FM + */ + if (IS_CJK_TTY) { + HText_appendCharacter(me->text, c); + +#define PASSHICTRL (me->T.transp || \ + code >= LYlowest_eightbit[me->inUCLYhndl]) +#define PASS8859SPECL me->T.pass_160_173_raw +#define PASSHI8BIT (HTPassEightBitRaw || \ + (me->T.do_8bitraw && !me->T.trans_from_uni)) + /* + * If HTPassHighCtrlRaw is set (e.g., for KOI8-R) assume the + * document matches and pass 127-160 8-bit characters. If it + * doesn't match, the user should toggle raw/CJK mode off. - FM + */ + } else if (TOASCII(code) >= 127 && TOASCII(code) < 161 && /* S/390 -- gil -- 0427 */ + PASSHICTRL && PASS8859SPECL) { + HText_appendCharacter(me->text, c); + } else if (code == CH_SHY && PASS8859SPECL) { + HText_appendCharacter(me->text, c); + /* + * If neither HTPassHighCtrlRaw nor CJK is set, play it safe and + * treat 160 (nbsp) as an ASCII space (32). - FM + */ + } else if (code == CH_NBSP) { + HText_appendCharacter(me->text, ' '); + /* + * If neither HTPassHighCtrlRaw nor CJK is set, play it safe and + * ignore 173 (shy). - FM + * Now only ignore it for color style, which doesn't handle it + * anyway. Otherwise pass it on as LY_SOFT_HYPHEN and let HText + * deal with it. It should be either ignored, or displayed as a + * hyphen if it was indeed at the end of a line. Well it should. + * - kw + */ + } else if (code == CH_SHY) { +#ifndef USE_COLOR_STYLE + HText_appendCharacter(me->text, LY_SOFT_HYPHEN); +#endif + continue; + /* + * If we get to here, pass the displayable ASCII characters. - FM + */ + } else if ((code >= ' ' && code != UCS_REPL && TOASCII(code) < 127) || + (PASSHI8BIT && + c >= LYlowest_eightbit[me->outUCLYhndl]) || + *p == '\n' || *p == '\t') { + HText_appendCharacter(me->text, c); + /* + * Use an ASCII space (32) for ensp, emsp or thinsp. - FM + */ + } else if (code == 8194 || code == 8195 || code == 8201) { + HText_appendCharacter(me->text, ' '); + /* + * If we want the raw character, pass it now. - FM + */ + } else if (me->T.use_raw_char_in && saved_char_in) { + HText_appendCharacter(me->text, saved_char_in); +/****************************************************************** + * I. LATIN-1 OR UCS2 TO DISPLAY CHARSET + ******************************************************************/ + } else if ((chk = (BOOL) (me->T.trans_from_uni && code >= 160)) && + (uck = UCTransUniChar(code, + me->outUCLYhndl)) >= ' ' && /* S/390 -- gil -- 0464 */ + uck < 256) { + CTRACE((tfp, "UCTransUniChar returned 0x%.2" PRI_UCode_t + ":'%c'.\n", + uck, FROMASCII(UCH(uck)))); + HText_appendCharacter(me->text, ((char) (uck & 0xff))); + } else if (chk && + (uck == -4 || + (me->T.repl_translated_C0 && uck > 0 && uck < ' ')) && /* S/390 -- gil -- 0481 */ + /* + * Not found; look for replacement string. + */ + (uck = UCTransUniCharStr(replace_buf, 60, code, + me->outUCLYhndl, 0) >= 0)) { + /* + * No further tests for valididy - assume that whoever defined + * replacement strings knew what she was doing. + */ + HText_appendText(me->text, replace_buf); + /* + * If we get to here, and should have translated, translation has + * failed so far. + */ + } else if (chk && TOASCII(code) > 127 && me->T.output_utf8) { /* S/390 -- gil -- 0498 */ + /* + * We want UTF-8 output, so do it now. - FM + */ + if (*me->U.utf_buf) { + HText_appendText(me->text, me->U.utf_buf); + me->U.utf_buf[0] = '\0'; + me->U.utf_buf_p = me->U.utf_buf; + } else if (UCConvertUniToUtf8(code, replace_buf)) { + HText_appendText(me->text, replace_buf); + } else { + /* + * Out of luck, so use the UHHH notation (ugh). - gil + */ + /* S/390 -- gil -- 0517 */ + sprintf(replace_buf, "U%.2lX", (unsigned long) TOASCII(code)); + HText_appendText(me->text, replace_buf); + } + /* + * If we don't actually want the character, make it safe and output + * that now. - FM + */ + } else if ((c_unsign > 0 && + (int) c_unsign < LYlowest_eightbit[me->outUCLYhndl]) || + (me->T.trans_from_uni && !HTPassEightBitRaw)) { + /* + * If we do not have the "7-bit approximations" as our output + * character set (in which case we did it already) seek a + * translation for that. Otherwise, or if the translation fails, + * use UHHH notation. - FM + */ + if ((chk = (BOOL) (me->outUCLYhndl != + UCGetLYhndl_byMIME("us-ascii"))) && + (uck = UCTransUniChar(code, + UCGetLYhndl_byMIME("us-ascii"))) + >= ' ' && TOASCII(uck) < 127) { /* S/390 -- gil -- 0535 */ + /* + * Got an ASCII character (yippey). - FM + */ + c = FROMASCII((char) uck); + HText_appendCharacter(me->text, c); + } else if ((chk && uck == -4) && + (uck = UCTransUniCharStr(replace_buf, + 60, code, + UCGetLYhndl_byMIME("us-ascii"), + 0) >= 0)) { + /* + * Got a replacement string (yippey). - FM + */ + HText_appendText(me->text, replace_buf); + } else if (code == 8204 || code == 8205) { + /* + * Ignore 8204 (zwnj) or 8205 (zwj), if we get to here. - FM + */ + CTRACE((tfp, "HTPlain_write: Ignoring '%" PRI_UCode_t "'.\n", code)); + } else if (code == 8206 || code == 8207) { + /* + * Ignore 8206 (lrm) or 8207 (rlm), if we get to here. - FM + */ + CTRACE((tfp, "HTPlain_write: Ignoring '%" PRI_UCode_t "'.\n", code)); + } else { + /* + * Out of luck, so use the UHHH notation (ugh). - FM + */ + /* do not print UHHH for now + sprintf(replace_buf, "U%.2lX", code); + HText_appendText(me->text, replace_buf); + */ + } + /* + * If we get to here and have a monobyte character, pass it. - FM + */ + } else if (c_unsign != 0 && c_unsign < 256) { + HText_appendCharacter(me->text, c); + } +#endif /* REMOVE_CR_ONLY */ + } +} + +/* Free an HTML object + * ------------------- + * + * Note that the SGML parsing context is freed, but the created object is + * not, as it takes on an existence of its own unless explicitly freed. + */ +static void HTPlain_free(HTStream *me) +{ + if (HTPlain_bs_pending >= 2) + HText_appendCharacter(me->text, '_'); + FREE(me); +} + +/* End writing +*/ +static void HTPlain_abort(HTStream *me, HTError e GCC_UNUSED) +{ + HTPlain_free(me); +} + +/* Structured Object Class + * ----------------------- + */ +static const HTStreamClass HTPlain = +{ + "PlainPresenter", + HTPlain_free, + HTPlain_abort, + HTPlain_put_character, HTPlain_put_string, HTPlain_write, +}; + +/* New object + * ---------- + */ +HTStream *HTPlainPresent(HTPresentation *pres GCC_UNUSED, HTParentAnchor *anchor, + HTStream *sink GCC_UNUSED) +{ + + HTStream *me = (HTStream *) malloc(sizeof(*me)); + + if (me == NULL) + outofmem(__FILE__, "HTPlain_new"); + + me->isa = &HTPlain; + + HTPlain_lastraw = -1; + + me->U.utf_count = 0; + me->U.utf_char = 0; + me->U.utf_buf[0] = me->U.utf_buf[6] = me->U.utf_buf[7] = '\0'; + me->U.utf_buf_p = me->U.utf_buf; + me->outUCLYhndl = HTAnchor_getUCLYhndl(anchor, UCT_STAGE_HTEXT); + me->inUCLYhndl = HTAnchor_getUCLYhndl(anchor, UCT_STAGE_PARSER); + HTPlain_getChartransInfo(me, anchor); + UCSetTransParams(&me->T, + me->inUCLYhndl, me->inUCI, + me->outUCLYhndl, + HTAnchor_getUCInfoStage(anchor, UCT_STAGE_HTEXT)); + + me->text = HText_new(anchor); + HText_setStyle(me->text, LYstyles(HTML_XMP)); + HText_beginAppend(me->text); + + return (HTStream *) me; +} |