1 /*
2 * lm2latex - src/l2l_scanner.l
3 * Copyright (C) 2010 Sebastian Harl <sh@tokkee.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
17 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
18 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
19 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
28 /*
29 * A Linux-Magazin markup to LaTeX converter -- LM markup scanner.
30 */
32 %{
33 #if HAVE_CONFIG_H
34 # include "config.h"
35 #endif
37 #include <assert.h>
39 #include <ctype.h>
41 #include <stdarg.h>
42 #include <stdio.h>
43 #include <stdlib.h>
44 #include <string.h>
46 typedef struct {
47 char *data;
48 size_t size;
49 size_t len;
50 } l2l_strbuf_t;
52 #define L2L_STRBUF_INIT { NULL, 0, 0 }
53 #define L2L_STRBUF_FREE(buf) ((buf)->size - (buf)->len)
54 #define L2L_STRBUF_END(buf) ((buf)->data + (buf)->len)
55 #define L2L_STRBUF_CLEAR(buf) ((buf)->len = 0)
57 static int
58 l2l_strbuf_append(l2l_strbuf_t *buf, const char *fmt, ...);
60 static void
61 l2l_strbuf_chomp(l2l_strbuf_t *buf);
63 static void
64 l2l_strbuf_destroy(l2l_strbuf_t *buf);
66 #define L2L_YY_APPEND_OR_ECHO(strbuf, ...) \
67 do { \
68 if ((strbuf)) { \
69 if (l2l_strbuf_append((strbuf), __VA_ARGS__)) \
70 YY_FATAL_ERROR("ERROR: internal error"); \
71 } \
72 else \
73 fprintf(yyout, __VA_ARGS__); \
74 } while (0)
76 #define L2L_STATE_HEADER_OR_ABORT \
77 do { \
78 if (l2l_scanner_state != L2L_HEADER) \
79 YY_FATAL_ERROR("ERROR: unexpected header definition"); \
80 } while (0)
82 #define L2L_PATTERN_IS(str) (! strncmp(yytext, (str), strlen(str)))
83 #define L2L_PATTERN_IS_HEADER \
84 (L2L_PATTERN_IS("@R:") || L2L_PATTERN_IS("@SW:") \
85 || L2L_PATTERN_IS("@D:") || L2L_PATTERN_IS("@T:") \
86 || L2L_PATTERN_IS("@A:") || L2L_PATTERN_IS("@V:"))
87 %}
89 %option yylineno
90 %option noyywrap
92 /* optimize for "fast scanning"; create an 8-bit scanner */
93 %option fast 8bit
95 /* generate a reentrant scanner in its own namespace */
96 %option reentrant
97 %option prefix="l2l_yy" outfile="lex.yy.c"
99 %option verbose warn
101 %s box
103 %x caption box_caption
104 %x command
105 %x headertxt
106 %x itemize
107 %x listing
108 %x title
109 %x url
111 COMMENT @#:.*
112 WHITESPACE [ \t]
114 ANY_COMMAND @(R|SW|D|T|V|A|L|ZT|LI|B|Bi|IT|IL|IE|KT|KL|KE|TT|TH|TL|TE):
116 %%
118 %{
119 enum {
120 L2L_HEADER,
121 L2L_BODY,
122 L2L_FIGURE,
124 L2L_UNQUOTED_TEXT,
125 L2L_QUOTED_TEXT,
126 };
128 int l2l_scanner_state = L2L_HEADER;
129 int l2l_quote_state = L2L_UNQUOTED_TEXT;
131 /* text formatting */
132 _Bool l2l_italic = 0;
133 _Bool l2l_bold = 0;
134 _Bool l2l_code = 0;
135 _Bool l2l_sup = 0;
136 _Bool l2l_sub = 0;
137 _Bool l2l_li_italic = 0;
139 /* title page information */
140 l2l_strbuf_t l2l_category = L2L_STRBUF_INIT;
141 l2l_strbuf_t l2l_keyword = L2L_STRBUF_INIT;
142 l2l_strbuf_t l2l_title = L2L_STRBUF_INIT;
143 l2l_strbuf_t l2l_headline = L2L_STRBUF_INIT;
144 l2l_strbuf_t l2l_author = L2L_STRBUF_INIT;
145 l2l_strbuf_t l2l_abstract = L2L_STRBUF_INIT;
147 /* temp. buffers */
148 l2l_strbuf_t l2l_caption = L2L_STRBUF_INIT;
149 l2l_strbuf_t l2l_ititle = L2L_STRBUF_INIT;
151 l2l_strbuf_t *l2l_buf_ptr = NULL;
153 int l2l_last_yystart = INITIAL;
154 %}
156 {COMMENT} { fprintf(yyout, "%%%s", yytext + strlen("@#:")); }
158 <INITIAL,box,caption,box_caption,command,headertxt,itemize,title>{
159 /* LaTeX reserved characters */
160 [#$%&_{}] { L2L_YY_APPEND_OR_ECHO(l2l_buf_ptr, "\\%s", yytext); }
161 [\^~] { L2L_YY_APPEND_OR_ECHO(l2l_buf_ptr, "\\%s{}", yytext); }
162 [\\] { L2L_YY_APPEND_OR_ECHO(l2l_buf_ptr, "$\\backslash$"); }
164 /* special characters */
165 /* '---' and '--' are handled by LaTeX */
166 \*\* L2L_YY_APPEND_OR_ECHO(l2l_buf_ptr, "~");
168 :\* L2L_YY_APPEND_OR_ECHO(l2l_buf_ptr, "\\,");
170 ["] {
171 if (l2l_quote_state == L2L_UNQUOTED_TEXT) {
172 L2L_YY_APPEND_OR_ECHO(l2l_buf_ptr, "\"`");
173 l2l_quote_state = L2L_QUOTED_TEXT;
174 }
175 else {
176 assert(l2l_quote_state == L2L_QUOTED_TEXT);
177 L2L_YY_APPEND_OR_ECHO(l2l_buf_ptr, "\"'");
178 l2l_quote_state = L2L_UNQUOTED_TEXT;
179 }
180 }
182 /* text formatting */
183 \<[iI]> {
184 if (l2l_italic) {
185 L2L_YY_APPEND_OR_ECHO(l2l_buf_ptr, "}");
186 l2l_italic = 0;
187 }
188 else {
189 L2L_YY_APPEND_OR_ECHO(l2l_buf_ptr, "{\\itshape ");
190 l2l_italic = 1;
191 }
192 }
194 \<[bB]> {
195 if (l2l_bold) {
196 L2L_YY_APPEND_OR_ECHO(l2l_buf_ptr, "}");
197 l2l_bold = 0;
198 }
199 else {
200 L2L_YY_APPEND_OR_ECHO(l2l_buf_ptr, "{\\bfseries ");
201 l2l_bold = 1;
202 }
203 }
205 \<[cC]> {
206 if (l2l_code) {
207 L2L_YY_APPEND_OR_ECHO(l2l_buf_ptr, "}");
208 l2l_code = 0;
209 }
210 else {
211 L2L_YY_APPEND_OR_ECHO(l2l_buf_ptr, "{\\ttfamily ");
212 l2l_code = 1;
213 }
214 }
216 \<[\+]> {
217 if (l2l_sup) {
218 L2L_YY_APPEND_OR_ECHO(l2l_buf_ptr, "}}");
219 l2l_sup = 0;
220 }
221 else {
222 L2L_YY_APPEND_OR_ECHO(l2l_buf_ptr,
223 "\\ensuremath{^{\rmfamily ");
224 l2l_sup = 1;
225 }
226 }
228 \<[\-]> {
229 if (l2l_sub) {
230 L2L_YY_APPEND_OR_ECHO(l2l_buf_ptr, "}}");
231 l2l_sub = 0;
232 }
233 else {
234 L2L_YY_APPEND_OR_ECHO(l2l_buf_ptr,
235 "\\ensuremath{_{\rmfamily ");
236 l2l_sub = 1;
237 }
238 }
240 \[[0-9]+\] {
241 L2L_YY_APPEND_OR_ECHO(l2l_buf_ptr,
242 "{\\bfseries\\textcolor{DarkBlue}{%s}}", yytext);
243 }
244 }
246 \<[uU]> {
247 L2L_YY_APPEND_OR_ECHO(l2l_buf_ptr, "\\url{");
248 BEGIN(url);
249 }
251 <url>\<[uU]> {
252 L2L_YY_APPEND_OR_ECHO(l2l_buf_ptr, "}");
253 BEGIN(l2l_last_yystart);
254 }
256 <url>.|\n {
257 L2L_YY_APPEND_OR_ECHO(l2l_buf_ptr, "%s", yytext);
258 }
260 (Abbildung|Listing)({WHITESPACE}|\n)+[0-9]+ {
261 L2L_YY_APPEND_OR_ECHO(l2l_buf_ptr, "\\textcolor{DarkBlue}{%s}", yytext);
262 }
264 /*
265 * header
266 */
268 @R:{WHITESPACE}* {
269 L2L_STATE_HEADER_OR_ABORT;
270 l2l_buf_ptr = &l2l_category;
271 BEGIN(headertxt);
272 }
274 @SW:{WHITESPACE}* {
275 L2L_STATE_HEADER_OR_ABORT;
276 l2l_buf_ptr = &l2l_keyword;
277 BEGIN(headertxt);
278 }
280 @D:{WHITESPACE}* {
281 L2L_STATE_HEADER_OR_ABORT;
282 l2l_buf_ptr = &l2l_title;
283 BEGIN(headertxt);
284 }
286 @T:{WHITESPACE}* {
287 L2L_STATE_HEADER_OR_ABORT;
288 l2l_buf_ptr = &l2l_headline;
289 BEGIN(headertxt);
290 }
292 @A:{WHITESPACE}* {
293 L2L_STATE_HEADER_OR_ABORT;
294 l2l_buf_ptr = &l2l_author;
295 BEGIN(headertxt);
296 }
298 @V:{WHITESPACE}* {
299 L2L_STATE_HEADER_OR_ABORT;
300 l2l_buf_ptr = &l2l_abstract;
301 BEGIN(headertxt);
302 }
304 <headertxt>{ANY_COMMAND} {
305 if (l2l_buf_ptr) {
306 l2l_strbuf_chomp(l2l_buf_ptr);
307 l2l_buf_ptr = NULL;
308 }
310 if (! L2L_PATTERN_IS_HEADER) {
311 assert(l2l_scanner_state == L2L_HEADER);
313 if (l2l_category.len || l2l_keyword.len
314 || l2l_title.len || l2l_headline.len) {
315 fprintf(yyout, "\\title{");
317 if (l2l_category.len || l2l_keyword.len) {
318 fprintf(yyout, "{\\scriptsize [");
319 if (l2l_category.len) {
320 fprintf(yyout, "%s", l2l_category.data);
321 if (l2l_keyword.len)
322 fprintf(yyout, " $\\rightarrow$ ");
323 }
324 if (l2l_keyword.len)
325 fprintf(yyout, "%s", l2l_keyword.data);
326 fprintf(yyout, "]}\\\\\n\\vspace{5mm}\n");
327 }
329 if (l2l_headline.len) {
330 if (l2l_title.len)
331 fprintf(yyout, "\\normalsize %s\\\\\n\\LARGE ",
332 l2l_title.data);
333 fprintf(yyout, "%s", l2l_headline.data);
334 }
335 else if (l2l_title.len)
336 fprintf(yyout, "%s", l2l_title.data);
338 fprintf(yyout, "}\n");
339 }
341 if (l2l_author.len)
342 fprintf(yyout, "\\author{%s}\n", l2l_author.data);
343 fprintf(yyout, "\\date{\\today}\n\n");
345 fprintf(yyout, "\\begin{document}\n\n");
346 l2l_scanner_state = L2L_BODY;
348 fprintf(yyout, "\\maketitle\n\n");
350 if (l2l_abstract.len)
351 fprintf(yyout, "\\begin{abstract}\n%s\n"
352 "\\end{abstract}\n\n", l2l_abstract.data);
354 fprintf(yyout, "\\twocolumn\n\n");
355 }
357 yyless(0);
358 BEGIN(l2l_last_yystart);
359 }
361 <headertxt>{COMMENT} { /* ignore */ }
363 <headertxt>.|\n {
364 if (l2l_buf_ptr)
365 if (l2l_strbuf_append(l2l_buf_ptr, "%s", yytext))
366 YY_FATAL_ERROR("ERROR: internal error");
367 /* else ignore */
368 }
370 /*
371 * body
372 */
374 \n\n{WHITESPACE}*\*{WHITESPACE}* {
375 fprintf(yyout, "\n\n\\begin{itemize}\n\\item ");
376 BEGIN(itemize);
377 }
379 <itemize>({WHITESPACE}|\n)*\n\n |
380 <itemize>({WHITESPACE}|\n)*{ANY_COMMAND} {
381 fprintf(yyout, "\n\\end{itemize}");
382 yyless(0);
383 BEGIN(l2l_last_yystart);
384 }
386 /* this will produce a longer match and, thus, take precedence over
387 * the pattern above matching an empty line after the itemize */
388 <itemize>({WHITESPACE}|\n)*\n{WHITESPACE}*\*{WHITESPACE}* {
389 fprintf(yyout, "\n\\item ");
390 }
391 <itemize>({WHITESPACE}|\n)*\n\n({WHITESPACE}{2,}|\t) ECHO;
393 <itemize>. ECHO;
395 @ZT:{WHITESPACE}* {
396 fprintf(yyout, "\\subsection*{");
397 BEGIN(command);
398 }
400 <command>({WHITESPACE}|\n)+{ANY_COMMAND} {
401 fprintf(yyout, "}");
402 yyless(0);
403 BEGIN(l2l_last_yystart);
404 }
406 <command>. ECHO;
408 @LI:{WHITESPACE}*\n? {
409 /* \xb7 = MIDDLE DOT (iso-8859-1 and iso-8859-15) */
410 fprintf(yyout, "\\begin{lstlisting}[escapechar=\xb7]\n");
411 BEGIN(listing);
412 }
414 <listing>\n*{ANY_COMMAND} {
415 fprintf(yyout, "\n\\end{lstlisting}");
416 yyless(0);
417 BEGIN(l2l_last_yystart);
418 }
420 <listing>\<§§I> {
421 if (l2l_li_italic) {
422 L2L_YY_APPEND_OR_ECHO(l2l_buf_ptr, "\xb7");
423 l2l_li_italic = 0;
424 }
425 else {
426 L2L_YY_APPEND_OR_ECHO(l2l_buf_ptr, "\xb7\\itshape ");
427 l2l_li_italic = 1;
428 }
429 }
431 <listing>§§\n /* ignore => lstlisting will insert appropriate arrows */;
433 <listing>. ECHO;
435 /*
436 * images/boxes
437 */
439 @(B|KT):{WHITESPACE}* {
440 _Bool is_image = 0;
441 _Bool is_box = 0;
443 if (! strncmp(yytext, "@B:", 3))
444 is_image = 1;
445 else if (! strncmp(yytext, "@KT:", 4))
446 is_box = 1;
448 if (l2l_scanner_state != L2L_FIGURE) {
449 if (is_box)
450 fprintf(yyout, "\\begin{l2lbox}\n");
451 else
452 fprintf(yyout, "\\begin{figure}\n");
453 l2l_scanner_state = L2L_FIGURE;
454 }
455 else {
456 l2l_scanner_state = L2L_BODY;
457 }
459 l2l_buf_ptr = &l2l_caption;
460 if (is_image)
461 BEGIN(caption);
462 else if (is_box)
463 BEGIN(box_caption);
464 else
465 assert(0);
466 }
468 @Bi:.*\n {
469 char *filename;
471 yytext[yyleng - 1] = '\0';
473 filename = yytext + strlen("@Bi:");
474 while (isspace((int)*filename))
475 ++filename;
477 if (l2l_scanner_state != L2L_FIGURE) {
478 fprintf(yyout, "\\begin{figure}\n");
479 l2l_scanner_state = L2L_FIGURE;
480 }
481 else {
482 l2l_scanner_state = L2L_BODY;
483 }
485 fprintf(yyout, "\\includegraphics[width=\\columnwidth]{%s}\n", filename);
487 if (l2l_scanner_state == L2L_BODY)
488 fprintf(yyout, "\\end{figure}\n");
489 }
491 @KL: {
492 if (l2l_scanner_state != L2L_FIGURE) {
493 fprintf(yyout, "\\begin{l2lbox}\n");
494 l2l_scanner_state = L2L_FIGURE;
495 }
496 else {
497 l2l_scanner_state = L2L_BODY;
498 }
500 l2l_last_yystart = box;
501 BEGIN(box);
502 }
504 <box>@(KE|L):{WHITESPACE}* {
505 fprintf(yyout, "\\end{l2lbox}");
506 l2l_scanner_state = L2L_BODY;
507 l2l_last_yystart = INITIAL;
508 BEGIN(l2l_last_yystart);
509 }
511 <caption,box_caption>{ANY_COMMAND} {
512 if (l2l_buf_ptr) {
513 l2l_strbuf_chomp(l2l_buf_ptr);
514 l2l_buf_ptr = NULL;
515 }
517 if (l2l_caption.len) {
518 fprintf(yyout, "\\caption*{%s}\n", l2l_caption.data);
519 L2L_STRBUF_CLEAR(&l2l_caption);
520 }
522 if ((l2l_scanner_state == L2L_BODY) && (YY_START != box_caption))
523 fprintf(yyout, "\\end{figure}\n\n");
525 yyless(0);
526 if (YY_START == caption)
527 BEGIN(l2l_last_yystart);
528 else if (YY_START == box_caption) {
529 l2l_last_yystart = box;
530 BEGIN(box);
531 }
532 else
533 assert(0);
534 }
536 <caption,box_caption>{COMMENT} { /* ignore */ }
538 <caption,box_caption>.|\n {
539 if (l2l_buf_ptr)
540 if (l2l_strbuf_append(l2l_buf_ptr, "%s", yytext))
541 YY_FATAL_ERROR("ERROR: internal error");
542 /* else ignore */
543 }
545 /*
546 * infos
547 */
549 @IT:{WHITESPACE}* {
550 l2l_buf_ptr = &l2l_ititle;
551 BEGIN(title);
552 }
554 <title>{ANY_COMMAND} {
555 if (l2l_buf_ptr) {
556 l2l_strbuf_chomp(l2l_buf_ptr);
557 l2l_buf_ptr = NULL;
558 }
560 if (l2l_ititle.len) {
561 fprintf(yyout, "\\subsection*{\\rule{\\columnwidth}{1pt}"
562 "\\newline %s}\n", l2l_ititle.data);
563 L2L_STRBUF_CLEAR(&l2l_ititle);
564 }
566 yyless(0);
567 BEGIN(l2l_last_yystart);
568 }
570 <title>{COMMENT} { /* ignore */ }
572 <title>.|\n {
573 if (l2l_buf_ptr)
574 if (l2l_strbuf_append(l2l_buf_ptr, "%s", yytext))
575 YY_FATAL_ERROR("ERROR: internal error");
576 /* else ignore */
577 }
579 @IL: { /* ignore */ }
581 @IE: { /* ignore */ }
583 /*
584 * tables
585 */
587 @TT: /* TODO */;
589 @TH: /* TODO */;
591 @TL: /* TODO */;
593 @TE: /* TODO */;
595 /* let all other rules that match "@L:" have a higher preceedence */
596 @L:{WHITESPACE}* { /* nothing to do */ }
598 <<EOF>> {
599 if (l2l_scanner_state == L2L_BODY) {
600 fprintf(yyout, "\\end{document}\n");
601 }
602 else
603 YY_FATAL_ERROR("ERROR: incomplete document");
605 l2l_strbuf_destroy(&l2l_category);
606 l2l_strbuf_destroy(&l2l_keyword);
607 l2l_strbuf_destroy(&l2l_title);
608 l2l_strbuf_destroy(&l2l_headline);
609 l2l_strbuf_destroy(&l2l_author);
610 l2l_strbuf_destroy(&l2l_abstract);
612 l2l_strbuf_destroy(&l2l_caption);
613 l2l_strbuf_destroy(&l2l_title);
615 yyterminate();
616 }
618 %%
620 static int
621 l2l_strbuf_append(l2l_strbuf_t *buf, const char *fmt, ...)
622 {
623 size_t str_len;
624 va_list ap;
626 int status;
628 if ((! buf) || (! fmt))
629 return 0;
631 va_start(ap, fmt);
632 status = vsnprintf(NULL, 0, fmt, ap);
633 va_end(ap);
635 if (status <= 0)
636 return -1;
638 str_len = (size_t)status;
640 if (str_len > L2L_STRBUF_FREE(buf)) {
641 char *new_data;
642 size_t new_size = 2 * buf->size;
644 if (str_len > buf->size)
645 new_size += str_len;
647 new_data = realloc(buf->data, new_size + 1);
648 if (! new_data) {
649 l2l_strbuf_destroy(buf);
650 return -1;
651 }
653 buf->data = new_data;
654 buf->size = new_size;
655 }
656 assert(buf->len + str_len <= buf->size);
658 va_start(ap, fmt);
659 status = vsnprintf(L2L_STRBUF_END(buf), L2L_STRBUF_FREE(buf) + 1, fmt, ap);
660 va_end(ap);
662 if (status <= 0)
663 return -1;
665 assert((size_t)status == str_len);
666 buf->len += str_len;
667 buf->data[buf->len] = '\0';
668 return 0;
669 } /* l2l_strbuf_append */
671 static void
672 l2l_strbuf_chomp(l2l_strbuf_t *buf)
673 {
674 if (! buf)
675 return;
677 while (buf->len && isspace((int)buf->data[buf->len - 1])) {
678 buf->data[buf->len - 1] = '\0';
679 --buf->len;
680 }
681 } /* l2l_strbuf_chomp */
683 static void
684 l2l_strbuf_destroy(l2l_strbuf_t *buf)
685 {
686 if (! buf)
687 return;
689 if (buf->data)
690 free(buf->data);
691 memset(buf, 0, sizeof(*buf));
692 } /* l2l_strbuf_destroy */
694 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */