Annotation of mandoc/roff.c, Revision 1.84
1.84 ! schwarze 1: /* $Id: roff.c,v 1.83 2010/05/24 22:25:58 schwarze Exp $ */
1.1 kristaps 2: /*
1.67 kristaps 3: * Copyright (c) 2010 Kristaps Dzonsons <kristaps@bsd.lv>
1.1 kristaps 4: *
5: * Permission to use, copy, modify, and distribute this software for any
1.66 kristaps 6: * purpose with or without fee is hereby granted, provided that the above
7: * copyright notice and this permission notice appear in all copies.
1.1 kristaps 8: *
1.66 kristaps 9: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
1.1 kristaps 16: */
1.66 kristaps 17: #ifdef HAVE_CONFIG_H
18: #include "config.h"
19: #endif
1.30 kristaps 20:
1.67 kristaps 21: #include <assert.h>
1.1 kristaps 22: #include <stdlib.h>
1.67 kristaps 23: #include <string.h>
1.75 kristaps 24: #include <stdio.h>
1.1 kristaps 25:
1.67 kristaps 26: #include "mandoc.h"
1.43 kristaps 27: #include "roff.h"
1.33 kristaps 28:
1.82 kristaps 29: #define RSTACK_MAX 128
30:
1.75 kristaps 31: #define ROFF_CTL(c) \
32: ('.' == (c) || '\'' == (c))
33:
1.67 kristaps 34: enum rofft {
1.80 kristaps 35: ROFF_am,
36: ROFF_ami,
37: ROFF_am1,
38: ROFF_de,
39: ROFF_dei,
40: ROFF_de1,
1.83 schwarze 41: ROFF_ds,
1.82 kristaps 42: ROFF_el,
43: ROFF_ie,
1.75 kristaps 44: ROFF_if,
1.76 kristaps 45: ROFF_ig,
1.83 schwarze 46: ROFF_rm,
47: ROFF_tr,
1.76 kristaps 48: ROFF_cblock,
1.75 kristaps 49: ROFF_ccond,
1.67 kristaps 50: ROFF_MAX
51: };
52:
1.82 kristaps 53: enum roffrule {
54: ROFFRULE_ALLOW,
55: ROFFRULE_DENY
56: };
57:
1.67 kristaps 58: struct roff {
59: struct roffnode *last; /* leaf of stack */
60: mandocmsg msg; /* err/warn/fatal messages */
61: void *data; /* privdata for messages */
1.82 kristaps 62: enum roffrule rstack[RSTACK_MAX]; /* stack of !`ie' rules */
63: int rstackpos; /* position in rstack */
1.79 kristaps 64: };
65:
1.67 kristaps 66: struct roffnode {
67: enum rofft tok; /* type of node */
68: struct roffnode *parent; /* up one in stack */
69: int line; /* parse line */
70: int col; /* parse col */
1.79 kristaps 71: char *end; /* end-rules: custom token */
72: int endspan; /* end-rules: next-line or infty */
1.82 kristaps 73: enum roffrule rule; /* current evaluation rule */
1.67 kristaps 74: };
75:
76: #define ROFF_ARGS struct roff *r, /* parse ctx */ \
1.72 kristaps 77: enum rofft tok, /* tok of macro */ \
1.67 kristaps 78: char **bufp, /* input buffer */ \
79: size_t *szp, /* size of input buffer */ \
80: int ln, /* parse line */ \
1.75 kristaps 81: int ppos, /* original pos in buffer */ \
82: int pos, /* current pos in buffer */ \
1.74 kristaps 83: int *offs /* reset offset of buffer data */
1.67 kristaps 84:
85: typedef enum rofferr (*roffproc)(ROFF_ARGS);
86:
87: struct roffmac {
88: const char *name; /* macro name */
1.79 kristaps 89: roffproc proc; /* process new macro */
90: roffproc text; /* process as child text of macro */
91: roffproc sub; /* process as child of macro */
92: int flags;
93: #define ROFFMAC_STRUCT (1 << 0) /* always interpret */
1.67 kristaps 94: };
95:
1.80 kristaps 96: static enum rofferr roff_block(ROFF_ARGS);
97: static enum rofferr roff_block_text(ROFF_ARGS);
98: static enum rofferr roff_block_sub(ROFF_ARGS);
99: static enum rofferr roff_cblock(ROFF_ARGS);
100: static enum rofferr roff_ccond(ROFF_ARGS);
1.82 kristaps 101: static enum rofferr roff_cond(ROFF_ARGS);
102: static enum rofferr roff_cond_text(ROFF_ARGS);
103: static enum rofferr roff_cond_sub(ROFF_ARGS);
1.83 schwarze 104: static enum rofferr roff_line(ROFF_ARGS);
1.67 kristaps 105:
106: const struct roffmac roffs[ROFF_MAX] = {
1.80 kristaps 107: { "am", roff_block, roff_block_text, roff_block_sub, 0 },
108: { "ami", roff_block, roff_block_text, roff_block_sub, 0 },
109: { "am1", roff_block, roff_block_text, roff_block_sub, 0 },
110: { "de", roff_block, roff_block_text, roff_block_sub, 0 },
111: { "dei", roff_block, roff_block_text, roff_block_sub, 0 },
112: { "de1", roff_block, roff_block_text, roff_block_sub, 0 },
1.83 schwarze 113: { "ds", roff_line, NULL, NULL, 0 },
1.82 kristaps 114: { "el", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT },
115: { "ie", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT },
116: { "if", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT },
1.80 kristaps 117: { "ig", roff_block, roff_block_text, roff_block_sub, 0 },
1.83 schwarze 118: { "rm", roff_line, NULL, NULL, 0 },
119: { "tr", roff_line, NULL, NULL, 0 },
1.79 kristaps 120: { ".", roff_cblock, NULL, NULL, 0 },
121: { "\\}", roff_ccond, NULL, NULL, 0 },
1.67 kristaps 122: };
123:
124: static void roff_free1(struct roff *);
125: static enum rofft roff_hash_find(const char *);
1.76 kristaps 126: static void roffnode_cleanscope(struct roff *);
1.67 kristaps 127: static int roffnode_push(struct roff *,
128: enum rofft, int, int);
129: static void roffnode_pop(struct roff *);
130: static enum rofft roff_parse(const char *, int *);
131:
132:
133: /*
134: * Look up a roff token by its name. Returns ROFF_MAX if no macro by
135: * the nil-terminated string name could be found.
136: */
137: static enum rofft
138: roff_hash_find(const char *p)
139: {
140: int i;
141:
142: /* FIXME: make this be fast and efficient. */
143:
144: for (i = 0; i < (int)ROFF_MAX; i++)
145: if (0 == strcmp(roffs[i].name, p))
146: return((enum rofft)i);
147:
148: return(ROFF_MAX);
149: }
150:
151:
152: /*
153: * Pop the current node off of the stack of roff instructions currently
154: * pending.
155: */
156: static void
157: roffnode_pop(struct roff *r)
158: {
159: struct roffnode *p;
160:
1.75 kristaps 161: assert(r->last);
162: p = r->last;
1.82 kristaps 163:
164: if (ROFF_el == p->tok)
165: if (r->rstackpos > -1)
166: r->rstackpos--;
167:
1.75 kristaps 168: r->last = r->last->parent;
1.74 kristaps 169: if (p->end)
170: free(p->end);
1.67 kristaps 171: free(p);
172: }
173:
174:
175: /*
176: * Push a roff node onto the instruction stack. This must later be
177: * removed with roffnode_pop().
178: */
179: static int
180: roffnode_push(struct roff *r, enum rofft tok, int line, int col)
181: {
182: struct roffnode *p;
183:
184: if (NULL == (p = calloc(1, sizeof(struct roffnode)))) {
185: (*r->msg)(MANDOCERR_MEM, r->data, line, col, NULL);
186: return(0);
187: }
188:
189: p->tok = tok;
190: p->parent = r->last;
191: p->line = line;
192: p->col = col;
1.79 kristaps 193: p->rule = p->parent ? p->parent->rule : ROFFRULE_DENY;
1.67 kristaps 194:
195: r->last = p;
196: return(1);
197: }
198:
199:
200: static void
201: roff_free1(struct roff *r)
202: {
203:
204: while (r->last)
205: roffnode_pop(r);
206: }
207:
208:
209: void
210: roff_reset(struct roff *r)
211: {
212:
213: roff_free1(r);
214: }
215:
216:
217: void
218: roff_free(struct roff *r)
219: {
220:
221: roff_free1(r);
222: free(r);
223: }
224:
225:
226: struct roff *
227: roff_alloc(const mandocmsg msg, void *data)
228: {
229: struct roff *r;
230:
231: if (NULL == (r = calloc(1, sizeof(struct roff)))) {
232: (*msg)(MANDOCERR_MEM, data, 0, 0, NULL);
233: return(0);
234: }
235:
236: r->msg = msg;
237: r->data = data;
1.82 kristaps 238: r->rstackpos = -1;
1.67 kristaps 239: return(r);
240: }
241:
242:
243: enum rofferr
1.74 kristaps 244: roff_parseln(struct roff *r, int ln,
245: char **bufp, size_t *szp, int pos, int *offs)
1.67 kristaps 246: {
247: enum rofft t;
1.79 kristaps 248: int ppos;
249:
250: /*
251: * First, if a scope is open and we're not a macro, pass the
252: * text through the macro's filter. If a scope isn't open and
253: * we're not a macro, just let it through.
254: */
1.74 kristaps 255:
1.75 kristaps 256: if (r->last && ! ROFF_CTL((*bufp)[pos])) {
1.78 kristaps 257: t = r->last->tok;
258: assert(roffs[t].text);
259: return((*roffs[t].text)
260: (r, t, bufp, szp, ln, pos, pos, offs));
1.75 kristaps 261: } else if ( ! ROFF_CTL((*bufp)[pos]))
1.67 kristaps 262: return(ROFF_CONT);
263:
1.79 kristaps 264: /*
265: * If a scope is open, go to the child handler for that macro,
266: * as it may want to preprocess before doing anything with it.
267: */
1.78 kristaps 268:
1.79 kristaps 269: if (r->last) {
270: t = r->last->tok;
271: assert(roffs[t].sub);
272: return((*roffs[t].sub)
273: (r, t, bufp, szp, ln, pos, pos, offs));
274: }
1.78 kristaps 275:
1.79 kristaps 276: /*
277: * Lastly, as we've no scope open, try to look up and execute
278: * the new macro. If no macro is found, simply return and let
279: * the compilers handle it.
280: */
1.67 kristaps 281:
1.75 kristaps 282: ppos = pos;
1.79 kristaps 283: if (ROFF_MAX == (t = roff_parse(*bufp, &pos)))
284: return(ROFF_CONT);
1.67 kristaps 285:
1.75 kristaps 286: assert(roffs[t].proc);
1.78 kristaps 287: return((*roffs[t].proc)
288: (r, t, bufp, szp, ln, ppos, pos, offs));
1.74 kristaps 289: }
290:
291:
292: int
293: roff_endparse(struct roff *r)
294: {
295:
296: if (NULL == r->last)
297: return(1);
298: return((*r->msg)(MANDOCERR_SCOPEEXIT, r->data, r->last->line,
299: r->last->col, NULL));
1.67 kristaps 300: }
301:
302:
303: /*
304: * Parse a roff node's type from the input buffer. This must be in the
305: * form of ".foo xxx" in the usual way.
306: */
307: static enum rofft
308: roff_parse(const char *buf, int *pos)
309: {
310: int j;
311: char mac[5];
312: enum rofft t;
313:
1.75 kristaps 314: assert(ROFF_CTL(buf[*pos]));
315: (*pos)++;
1.67 kristaps 316:
317: while (buf[*pos] && (' ' == buf[*pos] || '\t' == buf[*pos]))
318: (*pos)++;
319:
320: if ('\0' == buf[*pos])
321: return(ROFF_MAX);
322:
323: for (j = 0; j < 4; j++, (*pos)++)
324: if ('\0' == (mac[j] = buf[*pos]))
325: break;
1.82 kristaps 326: else if (' ' == buf[*pos] || (j && '\\' == buf[*pos]))
1.67 kristaps 327: break;
328:
329: if (j == 4 || j < 1)
330: return(ROFF_MAX);
331:
332: mac[j] = '\0';
333:
334: if (ROFF_MAX == (t = roff_hash_find(mac)))
335: return(t);
336:
337: while (buf[*pos] && ' ' == buf[*pos])
338: (*pos)++;
339:
340: return(t);
341: }
342:
343:
344: /* ARGSUSED */
345: static enum rofferr
1.76 kristaps 346: roff_cblock(ROFF_ARGS)
1.67 kristaps 347: {
348:
1.79 kristaps 349: /*
350: * A block-close `..' should only be invoked as a child of an
351: * ignore macro, otherwise raise a warning and just ignore it.
352: */
353:
1.76 kristaps 354: if (NULL == r->last) {
355: if ( ! (*r->msg)(MANDOCERR_NOSCOPE, r->data, ln, ppos, NULL))
356: return(ROFF_ERR);
357: return(ROFF_IGN);
358: }
1.67 kristaps 359:
1.81 kristaps 360: switch (r->last->tok) {
361: case (ROFF_am):
362: /* FALLTHROUGH */
363: case (ROFF_ami):
364: /* FALLTHROUGH */
365: case (ROFF_am1):
366: /* FALLTHROUGH */
367: case (ROFF_de):
368: /* FALLTHROUGH */
369: case (ROFF_dei):
370: /* FALLTHROUGH */
371: case (ROFF_de1):
372: /* FALLTHROUGH */
373: case (ROFF_ig):
374: break;
375: default:
1.76 kristaps 376: if ( ! (*r->msg)(MANDOCERR_NOSCOPE, r->data, ln, ppos, NULL))
377: return(ROFF_ERR);
1.67 kristaps 378: return(ROFF_IGN);
1.76 kristaps 379: }
1.67 kristaps 380:
1.76 kristaps 381: if ((*bufp)[pos])
382: if ( ! (*r->msg)(MANDOCERR_ARGSLOST, r->data, ln, pos, NULL))
383: return(ROFF_ERR);
1.71 kristaps 384:
385: roffnode_pop(r);
1.76 kristaps 386: roffnode_cleanscope(r);
387: return(ROFF_IGN);
1.71 kristaps 388:
1.67 kristaps 389: }
390:
391:
1.76 kristaps 392: static void
393: roffnode_cleanscope(struct roff *r)
1.67 kristaps 394: {
395:
1.76 kristaps 396: while (r->last) {
397: if (--r->last->endspan < 0)
398: break;
399: roffnode_pop(r);
400: }
1.67 kristaps 401: }
402:
403:
1.75 kristaps 404: /* ARGSUSED */
1.74 kristaps 405: static enum rofferr
1.75 kristaps 406: roff_ccond(ROFF_ARGS)
1.74 kristaps 407: {
408:
1.76 kristaps 409: if (NULL == r->last) {
410: if ( ! (*r->msg)(MANDOCERR_NOSCOPE, r->data, ln, ppos, NULL))
411: return(ROFF_ERR);
412: return(ROFF_IGN);
413: }
414:
1.82 kristaps 415: switch (r->last->tok) {
416: case (ROFF_el):
417: /* FALLTHROUGH */
418: case (ROFF_ie):
419: /* FALLTHROUGH */
420: case (ROFF_if):
421: break;
422: default:
1.75 kristaps 423: if ( ! (*r->msg)(MANDOCERR_NOSCOPE, r->data, ln, ppos, NULL))
424: return(ROFF_ERR);
425: return(ROFF_IGN);
426: }
427:
1.76 kristaps 428: if (r->last->endspan > -1) {
429: if ( ! (*r->msg)(MANDOCERR_NOSCOPE, r->data, ln, ppos, NULL))
430: return(ROFF_ERR);
431: return(ROFF_IGN);
432: }
433:
434: if ((*bufp)[pos])
435: if ( ! (*r->msg)(MANDOCERR_ARGSLOST, r->data, ln, pos, NULL))
436: return(ROFF_ERR);
437:
1.75 kristaps 438: roffnode_pop(r);
1.76 kristaps 439: roffnode_cleanscope(r);
440: return(ROFF_IGN);
441: }
442:
1.75 kristaps 443:
1.76 kristaps 444: /* ARGSUSED */
445: static enum rofferr
1.80 kristaps 446: roff_block(ROFF_ARGS)
1.76 kristaps 447: {
1.78 kristaps 448: int sv;
449: size_t sz;
1.76 kristaps 450:
1.80 kristaps 451: if (ROFF_ig != tok && '\0' == (*bufp)[pos]) {
452: if ( ! (*r->msg)(MANDOCERR_NOARGS, r->data, ln, ppos, NULL))
453: return(ROFF_ERR);
454: return(ROFF_IGN);
455: } else if (ROFF_ig != tok) {
456: while ((*bufp)[pos] && ' ' != (*bufp)[pos])
457: pos++;
458: while (' ' == (*bufp)[pos])
459: pos++;
460: }
461:
1.76 kristaps 462: if ( ! roffnode_push(r, tok, ln, ppos))
463: return(ROFF_ERR);
464:
1.79 kristaps 465: if ('\0' == (*bufp)[pos])
1.78 kristaps 466: return(ROFF_IGN);
467:
468: sv = pos;
469: while ((*bufp)[pos] && ' ' != (*bufp)[pos] &&
470: '\t' != (*bufp)[pos])
471: pos++;
472:
473: /*
474: * Note: groff does NOT like escape characters in the input.
475: * Instead of detecting this, we're just going to let it fly and
476: * to hell with it.
477: */
478:
479: assert(pos > sv);
480: sz = (size_t)(pos - sv);
481:
1.79 kristaps 482: if (1 == sz && '.' == (*bufp)[sv])
483: return(ROFF_IGN);
484:
1.78 kristaps 485: r->last->end = malloc(sz + 1);
486:
487: if (NULL == r->last->end) {
488: (*r->msg)(MANDOCERR_MEM, r->data, ln, pos, NULL);
489: return(ROFF_ERR);
490: }
491:
492: memcpy(r->last->end, *bufp + sv, sz);
493: r->last->end[(int)sz] = '\0';
494:
1.77 kristaps 495: if ((*bufp)[pos])
496: if ( ! (*r->msg)(MANDOCERR_ARGSLOST, r->data, ln, pos, NULL))
497: return(ROFF_ERR);
1.74 kristaps 498:
1.78 kristaps 499: return(ROFF_IGN);
500: }
501:
502:
503: /* ARGSUSED */
504: static enum rofferr
1.80 kristaps 505: roff_block_sub(ROFF_ARGS)
1.79 kristaps 506: {
507: enum rofft t;
508: int i, j;
509:
510: /*
511: * First check whether a custom macro exists at this level. If
512: * it does, then check against it. This is some of groff's
513: * stranger behaviours. If we encountered a custom end-scope
514: * tag and that tag also happens to be a "real" macro, then we
515: * need to try interpreting it again as a real macro. If it's
516: * not, then return ignore. Else continue.
517: */
518:
519: if (r->last->end) {
520: i = pos + 1;
521: while (' ' == (*bufp)[i] || '\t' == (*bufp)[i])
522: i++;
523:
524: for (j = 0; r->last->end[j]; j++, i++)
525: if ((*bufp)[i] != r->last->end[j])
526: break;
527:
528: if ('\0' == r->last->end[j] &&
529: ('\0' == (*bufp)[i] ||
530: ' ' == (*bufp)[i] ||
531: '\t' == (*bufp)[i])) {
532: roffnode_pop(r);
533: roffnode_cleanscope(r);
534:
535: if (ROFF_MAX != roff_parse(*bufp, &pos))
536: return(ROFF_RERUN);
537: return(ROFF_IGN);
538: }
539: }
540:
541: /*
542: * If we have no custom end-query or lookup failed, then try
543: * pulling it out of the hashtable.
544: */
545:
546: ppos = pos;
547: t = roff_parse(*bufp, &pos);
548:
549: /* If we're not a comment-end, then throw it away. */
550: if (ROFF_cblock != t)
551: return(ROFF_IGN);
552:
553: assert(roffs[t].proc);
554: return((*roffs[t].proc)(r, t, bufp,
555: szp, ln, ppos, pos, offs));
556: }
557:
558:
559: /* ARGSUSED */
560: static enum rofferr
1.80 kristaps 561: roff_block_text(ROFF_ARGS)
1.78 kristaps 562: {
563:
564: return(ROFF_IGN);
565: }
566:
567:
568: /* ARGSUSED */
569: static enum rofferr
1.82 kristaps 570: roff_cond_sub(ROFF_ARGS)
571: {
572: enum rofft t;
573: enum roffrule rr;
574:
575: ppos = pos;
576: rr = r->last->rule;
577:
1.84 ! schwarze 578: roff_cond_text(r, tok, bufp, szp, ln, ppos, pos, offs);
1.82 kristaps 579:
580: if (ROFF_MAX == (t = roff_parse(*bufp, &pos)))
581: return(ROFFRULE_DENY == rr ? ROFF_IGN : ROFF_CONT);
582:
583: /*
584: * A denied conditional must evaluate its children if and only
585: * if they're either structurally required (such as loops and
586: * conditionals) or a closing macro.
587: */
588: if (ROFFRULE_DENY == rr)
589: if ( ! (ROFFMAC_STRUCT & roffs[t].flags))
590: if (ROFF_ccond != t)
591: return(ROFF_IGN);
592:
593: assert(roffs[t].proc);
594: return((*roffs[t].proc)
595: (r, t, bufp, szp, ln, ppos, pos, offs));
596: }
597:
598:
599: /* ARGSUSED */
600: static enum rofferr
601: roff_cond_text(ROFF_ARGS)
1.78 kristaps 602: {
603: char *ep, *st;
1.82 kristaps 604: enum roffrule rr;
605:
606: rr = r->last->rule;
607:
608: /*
609: * We display the value of the text if out current evaluation
610: * scope permits us to do so.
611: */
1.78 kristaps 612:
613: st = &(*bufp)[pos];
614: if (NULL == (ep = strstr(st, "\\}"))) {
615: roffnode_cleanscope(r);
1.82 kristaps 616: return(ROFFRULE_DENY == rr ? ROFF_IGN : ROFF_CONT);
1.78 kristaps 617: }
618:
1.84 ! schwarze 619: if (ep > st && '\\' != *(ep - 1)) {
! 620: ep = '\0';
1.78 kristaps 621: roffnode_pop(r);
1.84 ! schwarze 622: }
1.78 kristaps 623:
624: roffnode_cleanscope(r);
1.82 kristaps 625: return(ROFFRULE_DENY == rr ? ROFF_IGN : ROFF_CONT);
1.74 kristaps 626: }
627:
628:
1.75 kristaps 629: /* ARGSUSED */
1.74 kristaps 630: static enum rofferr
1.82 kristaps 631: roff_cond(ROFF_ARGS)
1.74 kristaps 632: {
1.84 ! schwarze 633: int cpos; /* position of the condition */
1.77 kristaps 634: int sv;
1.74 kristaps 635:
1.82 kristaps 636: /* Stack overflow! */
637:
638: if (ROFF_ie == tok && r->rstackpos == RSTACK_MAX - 1) {
639: (*r->msg)(MANDOCERR_MEM, r->data, ln, ppos, NULL);
640: return(ROFF_ERR);
641: }
1.74 kristaps 642:
1.84 ! schwarze 643: cpos = pos;
! 644:
1.82 kristaps 645: if (ROFF_if == tok || ROFF_ie == tok) {
646: /*
647: * Read ahead past the conditional. FIXME: this does
648: * not work, as conditionals don't end on whitespace,
649: * but are parsed according to a formal grammar. It's
650: * good enough for now, however.
651: */
652: while ((*bufp)[pos] && ' ' != (*bufp)[pos])
653: pos++;
654: }
1.77 kristaps 655:
656: sv = pos;
1.75 kristaps 657: while (' ' == (*bufp)[pos])
658: pos++;
1.74 kristaps 659:
1.77 kristaps 660: /*
661: * Roff is weird. If we have just white-space after the
662: * conditional, it's considered the BODY and we exit without
663: * really doing anything. Warn about this. It's probably
664: * wrong.
665: */
666: if ('\0' == (*bufp)[pos] && sv != pos) {
667: if ( ! (*r->msg)(MANDOCERR_NOARGS, r->data, ln, ppos, NULL))
668: return(ROFF_ERR);
669: return(ROFF_IGN);
670: }
671:
672: if ( ! roffnode_push(r, tok, ln, ppos))
673: return(ROFF_ERR);
674:
1.84 ! schwarze 675: /* XXX: Implement more conditionals. */
1.82 kristaps 676:
1.84 ! schwarze 677: if (ROFF_if == tok || ROFF_ie == tok)
! 678: r->last->rule = 'n' == (*bufp)[cpos] ?
! 679: ROFFRULE_ALLOW : ROFFRULE_DENY;
! 680: else if (ROFF_el == tok) {
1.82 kristaps 681: /*
682: * An `.el' will get the value of the current rstack
683: * entry set in prior `ie' calls or defaults to DENY.
684: */
685: if (r->rstackpos < 0)
686: r->last->rule = ROFFRULE_DENY;
687: else
688: r->last->rule = r->rstack[r->rstackpos];
1.84 ! schwarze 689: }
! 690: if (ROFF_ie == tok) {
1.82 kristaps 691: /*
692: * An if-else will put the NEGATION of the current
693: * evaluated conditional into the stack.
694: */
695: r->rstackpos++;
696: if (ROFFRULE_DENY == r->last->rule)
697: r->rstack[r->rstackpos] = ROFFRULE_ALLOW;
698: else
699: r->rstack[r->rstackpos] = ROFFRULE_DENY;
700: }
1.84 ! schwarze 701: if (r->last->parent && ROFFRULE_DENY == r->last->parent->rule)
! 702: r->last->rule = ROFFRULE_DENY;
1.74 kristaps 703:
1.75 kristaps 704: r->last->endspan = 1;
705:
706: if ('\\' == (*bufp)[pos] && '{' == (*bufp)[pos + 1]) {
707: r->last->endspan = -1;
708: pos += 2;
1.79 kristaps 709: }
1.74 kristaps 710:
1.77 kristaps 711: /*
712: * If there are no arguments on the line, the next-line scope is
713: * assumed.
714: */
715:
1.75 kristaps 716: if ('\0' == (*bufp)[pos])
717: return(ROFF_IGN);
1.77 kristaps 718:
719: /* Otherwise re-run the roff parser after recalculating. */
1.74 kristaps 720:
1.75 kristaps 721: *offs = pos;
722: return(ROFF_RERUN);
1.83 schwarze 723: }
724:
725:
726: /* ARGSUSED */
727: static enum rofferr
728: roff_line(ROFF_ARGS)
729: {
730:
731: return(ROFF_IGN);
1.74 kristaps 732: }
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