Annotation of libwww/Library/src/HTTeXGen.c, revision 2.11
2.10 frystyk 1: /* HTTeXGen.c
2: ** HTML -> LaTeX CONVERTER
3: **
4: ** (c) COPYRIGHT CERN 1994.
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:
2.11 ! roeber 19: #include "sysdep.h"
! 20:
2.1 frystyk 21: #define BUFFER_SIZE 80 /* Line buffer attempts to make neat breaks */
2.8 frystyk 22: #define WORD_DELIMITERS ",;:[]()"
2.1 frystyk 23:
24: /* Implements: */
25: #include "HTTeXGen.h"
26: #include "HTMLPDTD.h"
27: #include "HTStream.h"
28: #include "SGML.h"
29: #include "HTFormat.h"
30:
31: /* HTML Object
32: ** -----------
33: */
34:
35: struct _HTStream {
36: CONST HTStreamClass * isa;
37: HTStream * target;
38: HTStreamClass targetClass; /* COPY for speed */
39: };
40:
41: struct _HTStructured {
42: CONST HTStructuredClass * isa;
43: HTStream * target;
44: HTStreamClass targetClass; /* COPY for speed */
45: CONST SGML_dtd * dtd;
46:
2.5 frystyk 47: char buffer[2*BUFFER_SIZE]; /* See note */
2.1 frystyk 48: char * write_pointer;
49: char * line_break;
50: BOOL sensitive; /* Can we put \n */
51: BOOL preformatted; /* Is it verbatim? */
52: BOOL markup; /* If doing LaTeX markup */
53: BOOL startup; /* To skip MIME header */
54: };
2.5 frystyk 55:
56: /* The buffer has to be bigger than 80 as latex markup might make the line
57: longer before we get to flush it. */
2.1 frystyk 58:
2.4 frystyk 59: PRIVATE char *TeX_names[HTMLP_ELEMENTS][2] = {
2.1 frystyk 60: { "", "" }, /* HTML_A */
61: { "", "" }, /* HTML_ABBREV */
62: { "\n\\begin{abstract}\n","\n\\end{abstract}\n"}, /* HTML_ABSTRACT */
63: { "", "" }, /* HTML_ACRONYM */
64: { "", "" }, /* HTML_ADDED */
65: { "{\\it ", "}" }, /* HTML_ADDRESS */
66: { "", "" }, /* HTML_ARG */
67: { "{\\bf ", "}" }, /* HTML_B */
68: { "", "" }, /* HTML_BASE */
69: { "{\\sf ", "}" }, /* HTML_BLOCKQUOTE */
70: { "", "" }, /* HTML_BODY */
71: { "", "" }, /* HTML_BOX */
72: { "", "" }, /* HTML_BR */
73: { "", "" }, /* HTML_BYLINE */
74: { "", "" }, /* HTML_CAPTION */
75: { "", "" }, /* HTML_CHANGED */
76: { "\\cite{", "}" }, /* HTML_CITE */
77: { "", "" }, /* HTML_CMD */
78: { "{\\tt ", "}" }, /* HTML_CODE */
79: { "\n\\typeout{", "}\n" }, /* HTML_COMMENT */
80: { "]", "" }, /* HTML_DD */
81: { "", "" }, /* HTML_DFN */
82: { "", "" }, /* HTML_DIR */
83: { "\n\\begin{description}","\n\\end{description}\n"}, /* HTML_DL */
84: { "\n\\item[", "" }, /* HTML_DT */
85: { "{\\em ", "}" }, /* HTML_EM */
86: { "", "" }, /* HTML_FIG */
87: { "\n\\footnote{", "}\n" }, /* HTML_FOOTNOTE */
88: { "", "" }, /* HTML_FORM */
89: { "\n\\chapter{", "}\n" }, /* HTML_H1 */
90: { "\n\\section{", "}\n" }, /* HTML_H2 */
91: { "\n\\subsection{","}\n" }, /* HTML_H3 */
92: { "\n\\subsubsection{","}\n" }, /* HTML_H4 */
93: { "\n\\paragraph{", "}\n" }, /* HTML_H5 */
94: { "\n\\subparagraph{","}\n" }, /* HTML_H6 */
95: { "", "\n" }, /* HTML_H7 */
96: { "", "" }, /* HTML_HEAD */
97: { "", "" }, /* HTML_HR */
98: { "", "" }, /* HTML_HTML */
2.3 duns 99: { "", "" }, /* HTML_HTMLPLUS */
2.1 frystyk 100: { "{\\it ", "}" }, /* HTML_I */
101: { "", "" }, /* HTML_IMAGE */
2.8 frystyk 102: { "_FIGUR_", "" }, /* HTML_IMG */
2.1 frystyk 103: { "", "" }, /* HTML_INPUT */
104: { "", "" }, /* HTML_ISINDEX */
105: { "{\\tt ", "}" }, /* HTML_KBD */
106: { "", "" }, /* HTML_L */
107: { "\n\\item ", "" }, /* HTML_LI */
108: { "", "" }, /* HTML_LINK */
109: { "", "" }, /* HTML_LISTING */
110: { "", "" }, /* HTML_LIT */
111: { "", "" }, /* HTML_MARGIN */
112: { "", "" }, /* HTML_MATH */
113: { "", "" }, /* HTML_MENU */
114: { "", "" }, /* HTML_NEXTID */
115: { "", "" }, /* HTML_NOTE */
116: { "\n\\begin{enumerate}\n","\n\\end{enumerate}\n"}, /* HTML_OL */
117: { "", "" }, /* HTML_OPTION */
118: { "", "" }, /* HTML_OVER */
119: { "\n\n", "" }, /* HTML_P */
120: { "", "" }, /* HTML_PERSON */
121: { "", "" }, /* HTML_PLAINTEXT */
122: { "\n\\begin{verbatim}"," \\end{verbatim}\n"}, /* HTML_PRE */
123: { "", "" }, /* HTML_Q */
124: { "\\begin{quote}", "\\end{quote}"}, /* HTML_QUOTE */
125: { "", "" }, /* HTML_RENDER */
126: { "", "" }, /* HTML_REMOVED */
127: { "", "" }, /* HTML_S */
128: { "", "" }, /* HTML_SAMP */
129: { "", "" }, /* HTML_SELECT */
130: { "{\\bf ", "}" }, /* HTML_STRONG */
131: { "", "" }, /* HTML_SUB */
132: { "", "" }, /* HTML_SUP */
133: { "", "" }, /* HTML_TAB */
134: { "", "" }, /* HTML_TABLE */
135: { "", "" }, /* HTML_TD */
136: { "", "" }, /* HTML_TEXTAREA */
137: { "", "" }, /* HTML_TH */
138: { "\n\\title{", "}\n\\author{}\n\\maketitle\n"}, /* HTML_TITLE */
139: { "", "" }, /* HTML_TR */
140: { "", "" }, /* HTML_TT */
141: { "", "" }, /* HTML_U */
142: { "\n\\begin{itemize}","\n\\end{itemize}\n"}, /* HTML_UL */
143: { "", "" }, /* HTML_VAR */
144: { "{\\sf ", "}" } /* HTML_XMP */
145: };
146:
2.8 frystyk 147: PRIVATE char *TeX_entities[HTML_ENTITIES] = {
2.1 frystyk 148: "\\AE ", /*"AElig", capital AE diphthong (ligature) */
2.2 frystyk 149: "\\\'{A}", /*"Aacute", capital A, acute accent */
150: "\\^{A}", /*"Acirc", capital A, circumflex accent */
151: "\\`{A}", /*"Agrave", capital A, grave accent */
152: "\\AA", /*"Aring", capital A, ring */
153: "\\~{A}", /*"Atilde", capital A, tilde */
154: "\\\"{A}", /*"Auml", capital A, dieresis or umlaut mark */
155: "\\c{C}", /*"Ccedil", capital C, cedilla */
156: "\\OE ", /*"ETH", capital Eth, Icelandic */
157: "\\\'{E}", /*"Eacute", capital E, acute accent */
158: "\\^{E}", /*"Ecirc", capital E, circumflex accent */
159: "\\`{E}", /*"Egrave", capital E, grave accent */
160: "\\\"{E}", /*"Euml", capital E, dieresis or umlaut mark */
161: "\\\'{I}", /*"Iacute", capital I, acute accent */
162: "\\^{I}", /*"Icirc", capital I, circumflex accent */
163: "\\`{I}", /*"Igrave", capital I, grave accent */
164: "\\\"{I}", /*"Iuml", capital I, dieresis or umlaut mark */
165: "\\~{N}", /*"Ntilde", capital N, tilde */
166: "\\\'{O}", /*"Oacute", capital O, acute accent */
167: "\\^{O}", /*"Ocirc", capital O, circumflex accent */
168: "\\`{O}", /*"Ograve", capital O, grave accent */
2.1 frystyk 169: "\\O ", /*"Oslash", capital O, slash */
2.2 frystyk 170: "\\~{O}", /*"Otilde", capital O, tilde */
171: "\\\"{O}", /*"Ouml", capital O, dieresis or umlaut mark */
172: " ", /*"THORN", capital THORN, Icelandic */
173: "\\\'{U}", /*"Uacute", capital U, acute accent */
174: "\\^{U}", /*"Ucirc", capital U, circumflex accent */
175: "\\`{U}", /*"Ugrave", capital U, grave accent */
176: "\\\"{U}", /*"Uuml", capital U, dieresis or umlaut mark */
177: "\\\'{Y}", /*"Yacute", capital Y, acute accent */
178: "\\\'{a}", /*"aacute", small a, acute accent */
179: "\\^{a}", /*"acirc", small a, circumflex accent */
2.1 frystyk 180: "\\ae ", /*"aelig", small ae diphthong (ligature) */
2.2 frystyk 181: "\\`{a}", /*"agrave", small a, grave accent */
2.1 frystyk 182: "&", /*"amp", ampersand */
183: "\\aa ", /*"aring", small a, ring */
2.2 frystyk 184: "\\~{a}", /*"atilde", small a, tilde */
185: "\\\"{a}", /*"auml", small a, dieresis or umlaut mark */
186: "\\c{c}", /*"ccedil", small c, cedilla */
187: "\\\'{e}", /*"eacute", small e, acute accent */
188: "\\^{c}", /*"ecirc", small e, circumflex accent */
189: "\\`{c}", /*"egrave", small e, grave accent */
190: "\\oe ", /*"eth", small eth, Icelandic */
191: "\\\"{e}", /*"euml", small e, dieresis or umlaut mark */
2.1 frystyk 192: ">", /*"gt", greater than */
2.2 frystyk 193: "\\\'{\\i}", /*"iacute", small i, acute accent */
194: "\\^{\\i}", /*"icirc", small i, circumflex accent */
195: "\\`{\\i}", /*"igrave", small i, grave accent */
196: "\\\"{\\i}", /*"iuml", small i, dieresis or umlaut mark */
2.1 frystyk 197: "<", /*"lt", less than */
2.2 frystyk 198: "\\~{n}", /*"ntilde", small n, tilde */
199: "\\\'{o}", /*"oacute", small o, acute accent */
200: "\\~{o}", /*"ocirc", small o, circumflex accent */
201: "\\`{o}", /*"ograve", small o, grave accent */
2.1 frystyk 202: "\\o ", /*"oslash", small o, slash */
2.2 frystyk 203: "\\~{o}", /*"otilde", small o, tilde */
204: "\\\"{o}", /*"ouml", small o, dieresis or umlaut mark */
2.8 frystyk 205: "\"", /*"quot", double quote sign - June 1994 */
2.1 frystyk 206: "\\ss ", /*"szlig", small sharp s, German (sz ligature)*/
2.2 frystyk 207: " ", /*"thorn", small thorn, Icelandic */
208: "\\\'{u}", /*"uacute", small u, acute accent */
209: "\\^{u}", /*"ucirc", small u, circumflex accent */
210: "\\`{u}", /*"ugrave", small u, grave accent */
211: "\\\"{u}", /*"uuml", small u, dieresis or umlaut mark */
212: "\\\'{y}", /*"yacute", small y, acute accent */
213: "\\\"{y}" /*"yuml", small y, dieresis or umlaut mark */
2.1 frystyk 214: };
215:
216:
217: /* Flush Buffer
218: ** ------------
219: */
220: PRIVATE void HTTeXGen_flush ARGS1(HTStructured *, me)
221: {
222: (*me->targetClass.put_block)(me->target,
223: me->buffer,
224: me->write_pointer - me->buffer);
225: me->write_pointer = me->buffer;
226: me->line_break = me->buffer;
227: }
228:
229:
230: /* Character handling
231: ** ------------------
232: **
233: */
234: PRIVATE void HTTeXGen_put_character ARGS2(HTStructured *, me, char, c)
235: {
236: if (!me->startup) /* To skip MIME header */
237: return;
238: if (c=='\n') {
239: if (me->markup || me->preformatted) { /* Put out as is and flush */
240: *me->write_pointer++ = c;
241: HTTeXGen_flush(me);
242: return;
243: } else if (me->sensitive || *(me->write_pointer-1)==' ') {
244: return;
245: } else
246: *me->write_pointer++ = ' '; /* Try to pretty print */
247: } else if (me->markup || me->preformatted) {
248: *me->write_pointer++ = c;
249: } else if (c==' ' || c=='\t') { /* Skip space and tabs */
250: if (*(me->write_pointer-1) != ' ')
251: *me->write_pointer++ = ' ';
252: else
253: return;
254: } else {
255: if (c=='$' || c=='&' || c=='%' || c=='#' || /* Special chars */
256: c=='{' || c=='}' || c=='_') {
257: *me->write_pointer++ = '\\';
258: *me->write_pointer++ = c;
259: } else if (c=='\\') { /* Special names */
260: char *temp = "$\\backslash$";
261: strcpy(me->write_pointer, temp);
262: me->write_pointer += strlen(temp);
263: } else if (c=='^') {
264: char *temp = "$\\hat{ }$";
265: strcpy(me->write_pointer, temp);
266: me->write_pointer += strlen(temp);
267: } else if (c=='~') {
268: char *temp = "$\\tilde{ }$";
269: strcpy(me->write_pointer, temp);
270: me->write_pointer += strlen(temp);
271: } else if (c=='|' || c=='<' || c=='>') { /* Math mode */
272: *me->write_pointer++ = '$';
273: *me->write_pointer++ = c;
274: *me->write_pointer++ = '$';
275: } else
276: *me->write_pointer++ = c; /* Char seems normal */
277: }
278:
2.6 frystyk 279: if (c==' ') /* Find delimiter */
2.1 frystyk 280: me->line_break = me->write_pointer;
281: else if (strchr(WORD_DELIMITERS, c))
282: me->line_break = me->write_pointer-1;
283:
284: /* Flush buffer out when full */
285: if (me->write_pointer >= me->buffer+BUFFER_SIZE-3) {
2.9 frystyk 286: #ifdef OLD_CODE
2.1 frystyk 287: if (me->markup || me->preformatted) {
2.9 frystyk 288: #endif /* OLD_CODE */
2.8 frystyk 289: if (me->preformatted) {
2.1 frystyk 290: *me->write_pointer = '\n';
291: (*me->targetClass.put_block)(me->target,
292: me->buffer,
293: me->write_pointer-me->buffer+1);
294: me->write_pointer = me->buffer;
295: } else { /* Use break-point */
296: char line_break_char = *me->line_break;
297: char *saved = me->line_break;
298: *me->line_break = '\n';
299: (*me->targetClass.put_block)(me->target,
300: me->buffer,
301: me->line_break-me->buffer+1);
302: *me->line_break = line_break_char;
303: { /* move next line in */
304: char *p = saved;
305: char *q;
306: for(q=me->buffer; p<me->write_pointer; )
307: *q++ = *p++;
308: }
309: me->write_pointer = me->buffer + (me->write_pointer-saved);
310: }
311: me->line_break = me->buffer;
312: }
2.9 frystyk 313: return;
2.1 frystyk 314: }
315:
316:
317:
318: /* String handling
319: ** ---------------
320: */
321: PRIVATE void HTTeXGen_put_string ARGS2(HTStructured *, me, CONST char*, s)
322: {
323: CONST char * p;
324: for (p=s; *p; p++)
325: HTTeXGen_put_character(me, *p);
326: }
327:
328:
329: PRIVATE void HTTeXGen_write ARGS3(HTStructured *, me, CONST char*, s, int, l)
330: {
331: CONST char * p;
332: for(p=s; p<s+l; p++)
333: HTTeXGen_put_character(me, *p);
334: }
335:
336:
337: /* Start Element
338: ** -------------
339: **
340: ** No attributes are put to the output Henrik 07/03-94
341: ** Does no assumptions of WHAT element is started...
342: */
343: PRIVATE void HTTeXGen_start_element ARGS4(
344: HTStructured *, me,
345: int, element_number,
346: CONST BOOL*, present,
347: CONST char **, value)
348: {
349: me->startup = YES; /* Now, let's get down to it */
2.6 frystyk 350: if (me->preformatted == YES) { /* Don't start markup in here */
351: if (TRACE)
352: fprintf(stderr, "LaTeX....... No Markup in verbatim mode\n");
2.1 frystyk 353: return;
2.6 frystyk 354: }
2.1 frystyk 355: if (element_number == HTML_PRE)
356: me->preformatted = YES;
357: if (element_number == HTML_CITE || /* No \n here, please! */
358: element_number == HTML_DT ||
359: element_number == HTML_H1 ||
360: element_number == HTML_H2 ||
361: element_number == HTML_H3 ||
362: element_number == HTML_H4 ||
363: element_number == HTML_H5 ||
364: element_number == HTML_H6 ||
365: element_number == HTML_H7 ||
366: element_number == HTML_TITLE)
367: me->sensitive = YES;
368: else if (element_number == HTML_DD) /* Only way to turn <DT> off */
369: me->sensitive = NO;
370: me->markup = element_number == HTML_A ? NO : YES;
371: HTTeXGen_put_string(me, *TeX_names[element_number]);
372: me->markup = NO;
373: }
374:
375:
376: /* End Element
377: ** -----------
378: **
379: ** Ends an markup element Henrik 07/03-94
380: ** Does no assumptions of WHAT element is ended...
381: */
382: PRIVATE void HTTeXGen_end_element ARGS2(HTStructured *, me,
2.9 frystyk 383: int , element_number)
2.1 frystyk 384: {
2.6 frystyk 385: if (me->preformatted && element_number != HTML_PRE) {
386: if (TRACE)
387: fprintf(stderr, "LaTeX....... No markup in verbatim mode\n");
388: return;
389: }
2.1 frystyk 390: me->preformatted = NO;
391: me->markup = YES;
392: HTTeXGen_put_string(me, *(TeX_names[element_number]+1));
393: me->markup = NO;
394: if (element_number == HTML_CITE ||
395: element_number == HTML_DL ||
396: element_number == HTML_H1 ||
397: element_number == HTML_H2 ||
398: element_number == HTML_H3 ||
399: element_number == HTML_H4 ||
400: element_number == HTML_H5 ||
401: element_number == HTML_H6 ||
402: element_number == HTML_H7 ||
403: element_number == HTML_TITLE)
404: me->sensitive = NO;
405: }
406:
407:
408: /* Expanding entities
409: ** ------------------
410: **
411: */
412: PRIVATE void HTTeXGen_put_entity ARGS2(HTStructured *, me, int, entity_number)
413: {
414: BOOL mark = me->markup;
415: if (*TeX_entities[entity_number] != '&' && /* Theese are converted later */
416: *TeX_entities[entity_number] != '<' &&
417: *TeX_entities[entity_number] != '>')
418: me->markup = YES;
419: HTTeXGen_put_string(me, TeX_entities[entity_number]);
420: me->markup = mark;
421: }
422:
423:
424:
425: /* Free an HTML object
426: ** -------------------
427: **
428: */
2.9 frystyk 429: PRIVATE int HTTeXGen_free ARGS1(HTStructured *, me)
2.1 frystyk 430: {
431: HTTeXGen_flush(me);
432: (*me->targetClass.put_string)(me->target, "\n\\end{document}\n");
433: HTTeXGen_flush(me);
2.7 duns 434: (*me->targetClass._free)(me->target); /* ripple through */
2.1 frystyk 435: free(me);
2.9 frystyk 436: return 0;
2.1 frystyk 437: }
438:
439:
2.9 frystyk 440: PRIVATE int HTTeXGen_abort ARGS2(HTStructured *, me, HTError, e)
2.1 frystyk 441: {
442: HTTeXGen_free(me);
2.9 frystyk 443: return EOF;
2.1 frystyk 444: }
445:
446:
447: /* Structured Object Class
448: ** -----------------------
449: */
450: PRIVATE CONST HTStructuredClass HTTeXGeneration = /* As opposed to print etc */
451: {
452: "HTMLToTeX",
453: HTTeXGen_free,
454: HTTeXGen_abort,
455: HTTeXGen_put_character, HTTeXGen_put_string, HTTeXGen_write,
456: HTTeXGen_start_element, HTTeXGen_end_element,
457: HTTeXGen_put_entity
458: };
459:
460:
461: /* HTConverter from HTML to TeX Stream
462: ** ------------------------------------------
463: **
464: */
465: PUBLIC HTStream* HTMLToTeX ARGS5(
466: HTRequest *, request,
467: void *, param,
468: HTFormat, input_format,
469: HTFormat, output_format,
470: HTStream *, output_stream)
471: {
472: HTStructured* me = (HTStructured*) calloc(1, sizeof(*me));
473: if (me == NULL) outofmem(__FILE__, "HTMLToTeX");
474:
475: me->isa = (HTStructuredClass*) &HTTeXGeneration;
476: me->dtd = &HTMLP_dtd;
477: me->target = output_stream;
478: me->targetClass = *me->target->isa;/* Copy pointers to routines for speed*/
479: me->write_pointer = me->buffer;
480: me->line_break = me->buffer;
481: (*me->targetClass.put_string)(me->target,
482: "\\documentstyle[11pt]{report}\n\\begin{document}\n");
483: return SGML_new(&HTMLP_dtd, me);
484: }
485:
486:
487: /* END OF FILE HTTeXGen.c */
488:
489:
490:
491:
492:
493:
494:
495:
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