Annotation of libwww/Library/src/HTTeXGen.c, revision 2.18
2.10 frystyk 1: /* HTTeXGen.c
2: ** HTML -> LaTeX CONVERTER
3: **
2.14 frystyk 4: ** (c) COPYRIGHT MIT 1995.
2.10 frystyk 5: ** Please first read the full copyright statement in the file COPYRIGH.
2.1 frystyk 6: **
7: ** This version of the HTML object sends LaTeX to the output stream.
8: ** No attributes are considered in the translation!
9: ** The module uses simple 1:1 table-conversions, but this COULD be
10: ** expanded to a stack-machine. This would then be in start_element and
11: ** end_element...
12: ** Henrik 07/03-94
2.7 duns 13: **
14: ** HISTORY:
15: ** 8 Jul 94 FM Insulate free() from _free structure element.
16: **
2.1 frystyk 17: */
18:
19: #define BUFFER_SIZE 80 /* Line buffer attempts to make neat breaks */
2.8 frystyk 20: #define WORD_DELIMITERS ",;:[]()"
2.1 frystyk 21:
2.12 frystyk 22: /* Library include files */
23: #include "tcp.h"
24: #include "HTUtils.h"
2.1 frystyk 25: #include "HTTeXGen.h"
26: #include "HTMLPDTD.h"
2.15 frystyk 27: #include "HTStruct.h"
2.1 frystyk 28: #include "HTFormat.h"
29:
30: /* HTML Object
31: ** -----------
32: */
33:
34: struct _HTStream {
35: CONST HTStreamClass * isa;
36: HTStream * target;
37: HTStreamClass targetClass; /* COPY for speed */
38: };
39:
40: struct _HTStructured {
41: CONST HTStructuredClass * isa;
42: HTStream * target;
43: HTStreamClass targetClass; /* COPY for speed */
44: CONST SGML_dtd * dtd;
45:
2.5 frystyk 46: char buffer[2*BUFFER_SIZE]; /* See note */
2.1 frystyk 47: char * write_pointer;
48: char * line_break;
49: BOOL sensitive; /* Can we put \n */
50: BOOL preformatted; /* Is it verbatim? */
51: BOOL markup; /* If doing LaTeX markup */
52: BOOL startup; /* To skip MIME header */
53: };
2.5 frystyk 54:
55: /* The buffer has to be bigger than 80 as latex markup might make the line
56: longer before we get to flush it. */
2.1 frystyk 57:
2.4 frystyk 58: PRIVATE char *TeX_names[HTMLP_ELEMENTS][2] = {
2.1 frystyk 59: { "", "" }, /* HTML_A */
60: { "", "" }, /* HTML_ABBREV */
61: { "\n\\begin{abstract}\n","\n\\end{abstract}\n"}, /* HTML_ABSTRACT */
62: { "", "" }, /* HTML_ACRONYM */
63: { "", "" }, /* HTML_ADDED */
64: { "{\\it ", "}" }, /* HTML_ADDRESS */
65: { "", "" }, /* HTML_ARG */
66: { "{\\bf ", "}" }, /* HTML_B */
67: { "", "" }, /* HTML_BASE */
68: { "{\\sf ", "}" }, /* HTML_BLOCKQUOTE */
69: { "", "" }, /* HTML_BODY */
70: { "", "" }, /* HTML_BOX */
71: { "", "" }, /* HTML_BR */
72: { "", "" }, /* HTML_BYLINE */
73: { "", "" }, /* HTML_CAPTION */
74: { "", "" }, /* HTML_CHANGED */
75: { "\\cite{", "}" }, /* HTML_CITE */
76: { "", "" }, /* HTML_CMD */
77: { "{\\tt ", "}" }, /* HTML_CODE */
78: { "\n\\typeout{", "}\n" }, /* HTML_COMMENT */
79: { "]", "" }, /* HTML_DD */
80: { "", "" }, /* HTML_DFN */
81: { "", "" }, /* HTML_DIR */
82: { "\n\\begin{description}","\n\\end{description}\n"}, /* HTML_DL */
83: { "\n\\item[", "" }, /* HTML_DT */
84: { "{\\em ", "}" }, /* HTML_EM */
85: { "", "" }, /* HTML_FIG */
86: { "\n\\footnote{", "}\n" }, /* HTML_FOOTNOTE */
87: { "", "" }, /* HTML_FORM */
88: { "\n\\chapter{", "}\n" }, /* HTML_H1 */
89: { "\n\\section{", "}\n" }, /* HTML_H2 */
90: { "\n\\subsection{","}\n" }, /* HTML_H3 */
91: { "\n\\subsubsection{","}\n" }, /* HTML_H4 */
92: { "\n\\paragraph{", "}\n" }, /* HTML_H5 */
93: { "\n\\subparagraph{","}\n" }, /* HTML_H6 */
94: { "", "\n" }, /* HTML_H7 */
95: { "", "" }, /* HTML_HEAD */
96: { "", "" }, /* HTML_HR */
97: { "", "" }, /* HTML_HTML */
2.3 duns 98: { "", "" }, /* HTML_HTMLPLUS */
2.1 frystyk 99: { "{\\it ", "}" }, /* HTML_I */
100: { "", "" }, /* HTML_IMAGE */
2.8 frystyk 101: { "_FIGUR_", "" }, /* HTML_IMG */
2.1 frystyk 102: { "", "" }, /* HTML_INPUT */
103: { "", "" }, /* HTML_ISINDEX */
104: { "{\\tt ", "}" }, /* HTML_KBD */
105: { "", "" }, /* HTML_L */
106: { "\n\\item ", "" }, /* HTML_LI */
107: { "", "" }, /* HTML_LINK */
108: { "", "" }, /* HTML_LISTING */
109: { "", "" }, /* HTML_LIT */
110: { "", "" }, /* HTML_MARGIN */
111: { "", "" }, /* HTML_MATH */
112: { "", "" }, /* HTML_MENU */
113: { "", "" }, /* HTML_NEXTID */
114: { "", "" }, /* HTML_NOTE */
115: { "\n\\begin{enumerate}\n","\n\\end{enumerate}\n"}, /* HTML_OL */
116: { "", "" }, /* HTML_OPTION */
117: { "", "" }, /* HTML_OVER */
118: { "\n\n", "" }, /* HTML_P */
119: { "", "" }, /* HTML_PERSON */
120: { "", "" }, /* HTML_PLAINTEXT */
121: { "\n\\begin{verbatim}"," \\end{verbatim}\n"}, /* HTML_PRE */
122: { "", "" }, /* HTML_Q */
123: { "\\begin{quote}", "\\end{quote}"}, /* HTML_QUOTE */
124: { "", "" }, /* HTML_RENDER */
125: { "", "" }, /* HTML_REMOVED */
126: { "", "" }, /* HTML_S */
127: { "", "" }, /* HTML_SAMP */
128: { "", "" }, /* HTML_SELECT */
129: { "{\\bf ", "}" }, /* HTML_STRONG */
130: { "", "" }, /* HTML_SUB */
131: { "", "" }, /* HTML_SUP */
132: { "", "" }, /* HTML_TAB */
133: { "", "" }, /* HTML_TABLE */
134: { "", "" }, /* HTML_TD */
135: { "", "" }, /* HTML_TEXTAREA */
136: { "", "" }, /* HTML_TH */
137: { "\n\\title{", "}\n\\author{}\n\\maketitle\n"}, /* HTML_TITLE */
138: { "", "" }, /* HTML_TR */
139: { "", "" }, /* HTML_TT */
140: { "", "" }, /* HTML_U */
141: { "\n\\begin{itemize}","\n\\end{itemize}\n"}, /* HTML_UL */
142: { "", "" }, /* HTML_VAR */
143: { "{\\sf ", "}" } /* HTML_XMP */
144: };
145:
2.8 frystyk 146: PRIVATE char *TeX_entities[HTML_ENTITIES] = {
2.1 frystyk 147: "\\AE ", /*"AElig", capital AE diphthong (ligature) */
2.2 frystyk 148: "\\\'{A}", /*"Aacute", capital A, acute accent */
149: "\\^{A}", /*"Acirc", capital A, circumflex accent */
150: "\\`{A}", /*"Agrave", capital A, grave accent */
151: "\\AA", /*"Aring", capital A, ring */
152: "\\~{A}", /*"Atilde", capital A, tilde */
153: "\\\"{A}", /*"Auml", capital A, dieresis or umlaut mark */
154: "\\c{C}", /*"Ccedil", capital C, cedilla */
155: "\\OE ", /*"ETH", capital Eth, Icelandic */
156: "\\\'{E}", /*"Eacute", capital E, acute accent */
157: "\\^{E}", /*"Ecirc", capital E, circumflex accent */
158: "\\`{E}", /*"Egrave", capital E, grave accent */
159: "\\\"{E}", /*"Euml", capital E, dieresis or umlaut mark */
160: "\\\'{I}", /*"Iacute", capital I, acute accent */
161: "\\^{I}", /*"Icirc", capital I, circumflex accent */
162: "\\`{I}", /*"Igrave", capital I, grave accent */
163: "\\\"{I}", /*"Iuml", capital I, dieresis or umlaut mark */
164: "\\~{N}", /*"Ntilde", capital N, tilde */
165: "\\\'{O}", /*"Oacute", capital O, acute accent */
166: "\\^{O}", /*"Ocirc", capital O, circumflex accent */
167: "\\`{O}", /*"Ograve", capital O, grave accent */
2.1 frystyk 168: "\\O ", /*"Oslash", capital O, slash */
2.2 frystyk 169: "\\~{O}", /*"Otilde", capital O, tilde */
170: "\\\"{O}", /*"Ouml", capital O, dieresis or umlaut mark */
171: " ", /*"THORN", capital THORN, Icelandic */
172: "\\\'{U}", /*"Uacute", capital U, acute accent */
173: "\\^{U}", /*"Ucirc", capital U, circumflex accent */
174: "\\`{U}", /*"Ugrave", capital U, grave accent */
175: "\\\"{U}", /*"Uuml", capital U, dieresis or umlaut mark */
176: "\\\'{Y}", /*"Yacute", capital Y, acute accent */
177: "\\\'{a}", /*"aacute", small a, acute accent */
178: "\\^{a}", /*"acirc", small a, circumflex accent */
2.1 frystyk 179: "\\ae ", /*"aelig", small ae diphthong (ligature) */
2.2 frystyk 180: "\\`{a}", /*"agrave", small a, grave accent */
2.1 frystyk 181: "&", /*"amp", ampersand */
182: "\\aa ", /*"aring", small a, ring */
2.2 frystyk 183: "\\~{a}", /*"atilde", small a, tilde */
184: "\\\"{a}", /*"auml", small a, dieresis or umlaut mark */
185: "\\c{c}", /*"ccedil", small c, cedilla */
186: "\\\'{e}", /*"eacute", small e, acute accent */
187: "\\^{c}", /*"ecirc", small e, circumflex accent */
188: "\\`{c}", /*"egrave", small e, grave accent */
189: "\\oe ", /*"eth", small eth, Icelandic */
190: "\\\"{e}", /*"euml", small e, dieresis or umlaut mark */
2.1 frystyk 191: ">", /*"gt", greater than */
2.2 frystyk 192: "\\\'{\\i}", /*"iacute", small i, acute accent */
193: "\\^{\\i}", /*"icirc", small i, circumflex accent */
194: "\\`{\\i}", /*"igrave", small i, grave accent */
195: "\\\"{\\i}", /*"iuml", small i, dieresis or umlaut mark */
2.1 frystyk 196: "<", /*"lt", less than */
2.2 frystyk 197: "\\~{n}", /*"ntilde", small n, tilde */
198: "\\\'{o}", /*"oacute", small o, acute accent */
199: "\\~{o}", /*"ocirc", small o, circumflex accent */
200: "\\`{o}", /*"ograve", small o, grave accent */
2.1 frystyk 201: "\\o ", /*"oslash", small o, slash */
2.2 frystyk 202: "\\~{o}", /*"otilde", small o, tilde */
203: "\\\"{o}", /*"ouml", small o, dieresis or umlaut mark */
2.8 frystyk 204: "\"", /*"quot", double quote sign - June 1994 */
2.1 frystyk 205: "\\ss ", /*"szlig", small sharp s, German (sz ligature)*/
2.2 frystyk 206: " ", /*"thorn", small thorn, Icelandic */
207: "\\\'{u}", /*"uacute", small u, acute accent */
208: "\\^{u}", /*"ucirc", small u, circumflex accent */
209: "\\`{u}", /*"ugrave", small u, grave accent */
210: "\\\"{u}", /*"uuml", small u, dieresis or umlaut mark */
211: "\\\'{y}", /*"yacute", small y, acute accent */
212: "\\\"{y}" /*"yuml", small y, dieresis or umlaut mark */
2.1 frystyk 213: };
214:
215:
216: /* Flush Buffer
217: ** ------------
218: */
2.13 frystyk 219: PRIVATE int HTTeXGen_flush ARGS1(HTStructured *, me)
2.1 frystyk 220: {
2.13 frystyk 221: int status;
222: if ((status =
223: (*me->targetClass.put_block)(me->target, me->buffer,
224: me->write_pointer-me->buffer)) != HT_OK)
225: return status;
2.1 frystyk 226: me->write_pointer = me->buffer;
227: me->line_break = me->buffer;
2.13 frystyk 228: return (*me->targetClass.flush)(me->target);
2.1 frystyk 229: }
230:
231:
232: /* Character handling
233: ** ------------------
234: **
235: */
2.13 frystyk 236: PRIVATE int HTTeXGen_put_character ARGS2(HTStructured *, me, char, c)
2.1 frystyk 237: {
238: if (!me->startup) /* To skip MIME header */
2.13 frystyk 239: return HT_OK;
2.1 frystyk 240: if (c=='\n') {
241: if (me->markup || me->preformatted) { /* Put out as is and flush */
242: *me->write_pointer++ = c;
243: HTTeXGen_flush(me);
2.13 frystyk 244: return HT_OK;
2.1 frystyk 245: } else if (me->sensitive || *(me->write_pointer-1)==' ') {
2.13 frystyk 246: return HT_OK;
2.1 frystyk 247: } else
248: *me->write_pointer++ = ' '; /* Try to pretty print */
249: } else if (me->markup || me->preformatted) {
250: *me->write_pointer++ = c;
251: } else if (c==' ' || c=='\t') { /* Skip space and tabs */
252: if (*(me->write_pointer-1) != ' ')
253: *me->write_pointer++ = ' ';
254: else
2.13 frystyk 255: return HT_OK;
2.1 frystyk 256: } else {
257: if (c=='$' || c=='&' || c=='%' || c=='#' || /* Special chars */
258: c=='{' || c=='}' || c=='_') {
259: *me->write_pointer++ = '\\';
260: *me->write_pointer++ = c;
261: } else if (c=='\\') { /* Special names */
262: char *temp = "$\\backslash$";
263: strcpy(me->write_pointer, temp);
264: me->write_pointer += strlen(temp);
265: } else if (c=='^') {
266: char *temp = "$\\hat{ }$";
267: strcpy(me->write_pointer, temp);
268: me->write_pointer += strlen(temp);
269: } else if (c=='~') {
270: char *temp = "$\\tilde{ }$";
271: strcpy(me->write_pointer, temp);
272: me->write_pointer += strlen(temp);
273: } else if (c=='|' || c=='<' || c=='>') { /* Math mode */
274: *me->write_pointer++ = '$';
275: *me->write_pointer++ = c;
276: *me->write_pointer++ = '$';
277: } else
278: *me->write_pointer++ = c; /* Char seems normal */
279: }
280:
2.6 frystyk 281: if (c==' ') /* Find delimiter */
2.1 frystyk 282: me->line_break = me->write_pointer;
283: else if (strchr(WORD_DELIMITERS, c))
284: me->line_break = me->write_pointer-1;
285:
286: /* Flush buffer out when full */
287: if (me->write_pointer >= me->buffer+BUFFER_SIZE-3) {
2.9 frystyk 288: #ifdef OLD_CODE
2.1 frystyk 289: if (me->markup || me->preformatted) {
2.9 frystyk 290: #endif /* OLD_CODE */
2.8 frystyk 291: if (me->preformatted) {
2.1 frystyk 292: *me->write_pointer = '\n';
293: (*me->targetClass.put_block)(me->target,
294: me->buffer,
295: me->write_pointer-me->buffer+1);
296: me->write_pointer = me->buffer;
297: } else { /* Use break-point */
298: char line_break_char = *me->line_break;
299: char *saved = me->line_break;
300: *me->line_break = '\n';
301: (*me->targetClass.put_block)(me->target,
302: me->buffer,
303: me->line_break-me->buffer+1);
304: *me->line_break = line_break_char;
305: { /* move next line in */
306: char *p = saved;
307: char *q;
308: for(q=me->buffer; p<me->write_pointer; )
309: *q++ = *p++;
310: }
311: me->write_pointer = me->buffer + (me->write_pointer-saved);
312: }
313: me->line_break = me->buffer;
314: }
2.13 frystyk 315: return HT_OK;
2.1 frystyk 316: }
317:
318:
319:
320: /* String handling
321: ** ---------------
322: */
2.13 frystyk 323: PRIVATE int HTTeXGen_put_string ARGS2(HTStructured *, me, CONST char*, s)
2.1 frystyk 324: {
2.13 frystyk 325: while (*s)
326: HTTeXGen_put_character(me, *s++);
327: return HT_OK;
2.1 frystyk 328: }
329:
330:
2.13 frystyk 331: PRIVATE int HTTeXGen_write ARGS3(HTStructured *, me, CONST char*, b, int, l)
2.1 frystyk 332: {
2.13 frystyk 333: while (l-- > 0)
334: HTTeXGen_put_character(me, *b++);
335: return HT_OK;
2.1 frystyk 336: }
337:
338:
339: /* Start Element
340: ** -------------
341: **
342: ** No attributes are put to the output Henrik 07/03-94
343: ** Does no assumptions of WHAT element is started...
344: */
345: PRIVATE void HTTeXGen_start_element ARGS4(
346: HTStructured *, me,
347: int, element_number,
348: CONST BOOL*, present,
349: CONST char **, value)
350: {
351: me->startup = YES; /* Now, let's get down to it */
2.6 frystyk 352: if (me->preformatted == YES) { /* Don't start markup in here */
2.16 frystyk 353: if (WWWTRACE)
2.17 frystyk 354: TTYPrint(TDEST, "LaTeX....... No Markup in verbatim mode\n");
2.1 frystyk 355: return;
2.6 frystyk 356: }
2.1 frystyk 357: if (element_number == HTML_PRE)
358: me->preformatted = YES;
359: if (element_number == HTML_CITE || /* No \n here, please! */
360: element_number == HTML_DT ||
361: element_number == HTML_H1 ||
362: element_number == HTML_H2 ||
363: element_number == HTML_H3 ||
364: element_number == HTML_H4 ||
365: element_number == HTML_H5 ||
366: element_number == HTML_H6 ||
367: element_number == HTML_H7 ||
368: element_number == HTML_TITLE)
369: me->sensitive = YES;
370: else if (element_number == HTML_DD) /* Only way to turn <DT> off */
371: me->sensitive = NO;
372: me->markup = element_number == HTML_A ? NO : YES;
373: HTTeXGen_put_string(me, *TeX_names[element_number]);
374: me->markup = NO;
375: }
376:
377:
378: /* End Element
379: ** -----------
380: **
381: ** Ends an markup element Henrik 07/03-94
382: ** Does no assumptions of WHAT element is ended...
383: */
384: PRIVATE void HTTeXGen_end_element ARGS2(HTStructured *, me,
2.9 frystyk 385: int , element_number)
2.1 frystyk 386: {
2.6 frystyk 387: if (me->preformatted && element_number != HTML_PRE) {
2.16 frystyk 388: if (WWWTRACE)
2.17 frystyk 389: TTYPrint(TDEST, "LaTeX....... No markup in verbatim mode\n");
2.6 frystyk 390: return;
391: }
2.1 frystyk 392: me->preformatted = NO;
393: me->markup = YES;
394: HTTeXGen_put_string(me, *(TeX_names[element_number]+1));
395: me->markup = NO;
396: if (element_number == HTML_CITE ||
397: element_number == HTML_DL ||
398: element_number == HTML_H1 ||
399: element_number == HTML_H2 ||
400: element_number == HTML_H3 ||
401: element_number == HTML_H4 ||
402: element_number == HTML_H5 ||
403: element_number == HTML_H6 ||
404: element_number == HTML_H7 ||
405: element_number == HTML_TITLE)
406: me->sensitive = NO;
407: }
408:
409:
410: /* Expanding entities
411: ** ------------------
412: **
413: */
414: PRIVATE void HTTeXGen_put_entity ARGS2(HTStructured *, me, int, entity_number)
415: {
416: BOOL mark = me->markup;
417: if (*TeX_entities[entity_number] != '&' && /* Theese are converted later */
418: *TeX_entities[entity_number] != '<' &&
419: *TeX_entities[entity_number] != '>')
420: me->markup = YES;
421: HTTeXGen_put_string(me, TeX_entities[entity_number]);
422: me->markup = mark;
423: }
424:
425:
426:
427: /* Free an HTML object
428: ** -------------------
429: **
430: */
2.9 frystyk 431: PRIVATE int HTTeXGen_free ARGS1(HTStructured *, me)
2.1 frystyk 432: {
433: HTTeXGen_flush(me);
434: (*me->targetClass.put_string)(me->target, "\n\\end{document}\n");
435: HTTeXGen_flush(me);
2.7 duns 436: (*me->targetClass._free)(me->target); /* ripple through */
2.1 frystyk 437: free(me);
2.13 frystyk 438: return HT_OK;
2.1 frystyk 439: }
440:
441:
2.18 ! frystyk 442: PRIVATE int HTTeXGen_abort ARGS2(HTStructured *, me, HTList *, e)
2.1 frystyk 443: {
444: HTTeXGen_free(me);
2.13 frystyk 445: return HT_ERROR;
2.1 frystyk 446: }
447:
448:
449: /* Structured Object Class
450: ** -----------------------
451: */
452: PRIVATE CONST HTStructuredClass HTTeXGeneration = /* As opposed to print etc */
453: {
454: "HTMLToTeX",
2.13 frystyk 455: HTTeXGen_flush,
2.1 frystyk 456: HTTeXGen_free,
457: HTTeXGen_abort,
458: HTTeXGen_put_character, HTTeXGen_put_string, HTTeXGen_write,
459: HTTeXGen_start_element, HTTeXGen_end_element,
460: HTTeXGen_put_entity
461: };
462:
463:
464: /* HTConverter from HTML to TeX Stream
465: ** ------------------------------------------
466: **
467: */
468: PUBLIC HTStream* HTMLToTeX ARGS5(
469: HTRequest *, request,
470: void *, param,
471: HTFormat, input_format,
472: HTFormat, output_format,
473: HTStream *, output_stream)
474: {
475: HTStructured* me = (HTStructured*) calloc(1, sizeof(*me));
476: if (me == NULL) outofmem(__FILE__, "HTMLToTeX");
477:
478: me->isa = (HTStructuredClass*) &HTTeXGeneration;
479: me->dtd = &HTMLP_dtd;
480: me->target = output_stream;
481: me->targetClass = *me->target->isa;/* Copy pointers to routines for speed*/
482: me->write_pointer = me->buffer;
483: me->line_break = me->buffer;
484: (*me->targetClass.put_string)(me->target,
485: "\\documentstyle[11pt]{report}\n\\begin{document}\n");
486: return SGML_new(&HTMLP_dtd, me);
487: }
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