Commit | Line | Data |
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8489eb67 | 1 | /* GNU Emacs routines to deal with syntax tables; also word and list parsing. |
b745025d | 2 | Copyright (C) 1985, 87, 93, 94, 95, 1997 Free Software Foundation, Inc. |
8489eb67 RS |
3 | |
4 | This file is part of GNU Emacs. | |
5 | ||
6 | GNU Emacs is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
a4275ad1 | 8 | the Free Software Foundation; either version 2, or (at your option) |
8489eb67 RS |
9 | any later version. |
10 | ||
11 | GNU Emacs is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU Emacs; see the file COPYING. If not, write to | |
3b7ad313 EN |
18 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
19 | Boston, MA 02111-1307, USA. */ | |
8489eb67 RS |
20 | |
21 | ||
18160b98 | 22 | #include <config.h> |
8489eb67 RS |
23 | #include <ctype.h> |
24 | #include "lisp.h" | |
25 | #include "commands.h" | |
26 | #include "buffer.h" | |
93da5fff | 27 | #include "charset.h" |
195d1361 RS |
28 | |
29 | /* Make syntax table lookup grant data in gl_state. */ | |
30 | #define SYNTAX_ENTRY_VIA_PROPERTY | |
31 | ||
8489eb67 | 32 | #include "syntax.h" |
195d1361 RS |
33 | #include "intervals.h" |
34 | ||
35 | /* We use these constants in place for comment-style and | |
36 | string-ender-char to distinguish comments/strings started by | |
37 | comment_fence and string_fence codes. */ | |
38 | ||
39 | #define ST_COMMENT_STYLE (256 + 1) | |
40 | #define ST_STRING_STYLE (256 + 2) | |
93da5fff | 41 | #include "category.h" |
8489eb67 | 42 | |
7bf5e9e4 | 43 | Lisp_Object Qsyntax_table_p, Qsyntax_table, Qscan_error; |
8489eb67 | 44 | |
340f92b5 RS |
45 | static void scan_sexps_forward (); |
46 | static int char_quoted (); | |
47 | ||
8489eb67 | 48 | int words_include_escapes; |
195d1361 | 49 | int parse_sexp_lookup_properties; |
8489eb67 | 50 | |
8ea151b2 RS |
51 | /* Used as a temporary in SYNTAX_ENTRY and other macros in syntax.h, |
52 | if not compiled with GCC. No need to mark it, since it is used | |
53 | only very temporarily. */ | |
54 | Lisp_Object syntax_temp; | |
55 | ||
e5d4f4dc RS |
56 | /* This is the internal form of the parse state used in parse-partial-sexp. */ |
57 | ||
58 | struct lisp_parse_state | |
59 | { | |
195d1361 RS |
60 | int depth; /* Depth at end of parsing. */ |
61 | int instring; /* -1 if not within string, else desired terminator. */ | |
62 | int incomment; /* Nonzero if within a comment at end of parsing. */ | |
63 | int comstyle; /* comment style a=0, or b=1, or ST_COMMENT_STYLE. */ | |
e5d4f4dc RS |
64 | int quoted; /* Nonzero if just after an escape char at end of parsing */ |
65 | int thislevelstart; /* Char number of most recent start-of-expression at current level */ | |
66 | int prevlevelstart; /* Char number of start of containing expression */ | |
195d1361 | 67 | int location; /* Char number at which parsing stopped. */ |
e5d4f4dc | 68 | int mindepth; /* Minimum depth seen while scanning. */ |
195d1361 | 69 | int comstr_start; /* Position just after last comment/string starter. */ |
e5d4f4dc RS |
70 | }; |
71 | \f | |
37bef230 RS |
72 | /* These variables are a cache for finding the start of a defun. |
73 | find_start_pos is the place for which the defun start was found. | |
74 | find_start_value is the defun start position found for it. | |
75 | find_start_buffer is the buffer it was found in. | |
76 | find_start_begv is the BEGV value when it was found. | |
77 | find_start_modiff is the value of MODIFF when it was found. */ | |
78 | ||
79 | static int find_start_pos; | |
80 | static int find_start_value; | |
81 | static struct buffer *find_start_buffer; | |
82 | static int find_start_begv; | |
83 | static int find_start_modiff; | |
195d1361 RS |
84 | \f |
85 | ||
86 | struct gl_state_s gl_state; /* Global state of syntax parser. */ | |
87 | ||
88 | INTERVAL interval_of (); | |
89 | #define INTERVALS_AT_ONCE 10 /* 1 + max-number of intervals | |
90 | to scan to property-change. */ | |
91 | ||
92 | /* | |
93 | Update gl_state to an appropriate interval which contains POS. The | |
94 | sign of COUNT give the relative position of POS wrt the previously | |
95 | valid interval. If INIT, only [be]_property fields of gl_state are | |
96 | valid at start, the rest is filled basing on OBJECT. | |
97 | ||
98 | `gl_state.*_i' are the intervals, and pos is further in the search | |
99 | direction than the intervals - or in an interval. We update the | |
100 | current syntax-table basing on the property of this interval, and | |
101 | update the interval to start further than POS - or be | |
102 | NULL_INTERVAL. We also update lim_property to be the next value of | |
103 | pos to call this subroutine again - or be before/after the | |
104 | start/end of OBJECT. */ | |
105 | ||
106 | void | |
107 | update_syntax_table (pos, count, init, object) | |
108 | int pos, count, init; | |
109 | Lisp_Object object; | |
110 | { | |
111 | Lisp_Object tmp_table; | |
112 | int cnt = 0, doing_extra = 0, invalidate = 1; | |
113 | INTERVAL i, oldi; | |
114 | ||
115 | if (init) | |
116 | { | |
117 | gl_state.start = gl_state.b_property; | |
118 | gl_state.stop = gl_state.e_property; | |
119 | gl_state.forward_i = interval_of (pos, object); | |
120 | i = gl_state.backward_i = gl_state.forward_i; | |
121 | gl_state.left_ok = gl_state.right_ok = 1; | |
122 | invalidate = 0; | |
123 | if (NULL_INTERVAL_P (i)) | |
124 | return; | |
125 | gl_state.b_property = i->position - 1; | |
126 | gl_state.e_property = INTERVAL_LAST_POS (i); | |
127 | goto update; | |
128 | } | |
129 | oldi = i = count > 0 ? gl_state.forward_i : gl_state.backward_i; | |
130 | ||
131 | /* We are guarantied to be called with pos either in i, of further off. */ | |
132 | if (NULL_INTERVAL_P (i)) | |
133 | error ("Error in syntax_table logic for to-the-end intervals"); | |
134 | else if (pos < i->position) /* Move left. */ | |
135 | { | |
136 | if (count > 0) | |
137 | error ("Error in syntax_table logic for intervals <-."); | |
138 | /* Update the interval. */ | |
139 | i = update_interval (i, pos); | |
140 | if (oldi->position != INTERVAL_LAST_POS (i)) | |
141 | { | |
142 | invalidate = 0; | |
143 | gl_state.right_ok = 1; /* Invalidate the other end. */ | |
144 | gl_state.forward_i = i; | |
145 | gl_state.e_property = INTERVAL_LAST_POS (i); | |
146 | } | |
147 | } | |
148 | else if (pos >= INTERVAL_LAST_POS (i)) /* Move right. */ | |
149 | { | |
150 | if (count < 0) | |
151 | error ("Error in syntax_table logic for intervals ->."); | |
152 | /* Update the interval. */ | |
153 | i = update_interval (i, pos); | |
154 | if (i->position != INTERVAL_LAST_POS (oldi)) | |
155 | { | |
156 | invalidate = 0; | |
157 | gl_state.left_ok = 1; /* Invalidate the other end. */ | |
158 | gl_state.backward_i = i; | |
159 | gl_state.b_property = i->position - 1; | |
160 | } | |
161 | } | |
162 | else if (count > 0 ? gl_state.right_ok : gl_state.left_ok) | |
163 | { | |
164 | /* We do not need to recalculate tmp_table. */ | |
165 | tmp_table = gl_state.old_prop; | |
166 | } | |
167 | ||
168 | update: | |
169 | tmp_table = textget (i->plist, Qsyntax_table); | |
170 | ||
171 | if (invalidate) | |
172 | invalidate = !EQ (tmp_table, gl_state.old_prop); /* Need to invalidate? */ | |
173 | ||
174 | if (invalidate) /* Did not get to adjacent interval. */ | |
175 | { /* with the same table => */ | |
176 | /* invalidate the old range. */ | |
177 | if (count > 0) | |
178 | { | |
179 | gl_state.backward_i = i; | |
180 | gl_state.left_ok = 1; /* Invalidate the other end. */ | |
181 | gl_state.b_property = i->position - 1; | |
182 | } | |
183 | else | |
184 | { | |
185 | gl_state.forward_i = i; | |
186 | gl_state.right_ok = 1; /* Invalidate the other end. */ | |
187 | gl_state.e_property = INTERVAL_LAST_POS (i); | |
188 | } | |
189 | } | |
37bef230 | 190 | |
195d1361 RS |
191 | gl_state.current_syntax_table = tmp_table; |
192 | gl_state.old_prop = tmp_table; | |
193 | if (Fsyntax_table_p (tmp_table) == Qt) | |
194 | { | |
195 | gl_state.use_global = 0; | |
196 | } | |
197 | else if (CONSP (tmp_table)) | |
198 | { | |
199 | gl_state.use_global = 1; | |
200 | gl_state.global_code = tmp_table; | |
201 | } | |
202 | else | |
203 | { | |
204 | gl_state.use_global = 0; | |
205 | gl_state.current_syntax_table = current_buffer->syntax_table; | |
206 | } | |
207 | ||
208 | while (!NULL_INTERVAL_P (i)) | |
209 | { | |
210 | if (cnt && !EQ (tmp_table, textget (i->plist, Qsyntax_table))) | |
211 | { | |
212 | if (count > 0) | |
213 | gl_state.right_ok = 0; | |
214 | else | |
215 | gl_state.left_ok = 0; | |
216 | break; | |
217 | } | |
218 | else if (cnt == INTERVALS_AT_ONCE) | |
219 | { | |
220 | if (count > 0) | |
221 | gl_state.right_ok = 1; | |
222 | else | |
223 | gl_state.left_ok = 1; | |
224 | break; | |
225 | } | |
226 | cnt++; | |
227 | i = count > 0 ? next_interval (i) : previous_interval (i); | |
228 | } | |
229 | if (NULL_INTERVAL_P (i)) | |
230 | { /* This property goes to the end. */ | |
231 | if (count > 0) | |
232 | gl_state.e_property = gl_state.stop; | |
233 | else | |
234 | gl_state.b_property = gl_state.start; | |
235 | } | |
236 | else | |
237 | { | |
238 | if (count > 0) | |
239 | { | |
240 | gl_state.e_property = i->position; | |
241 | gl_state.forward_i = i; | |
242 | } | |
243 | else | |
244 | { | |
245 | gl_state.b_property = i->position + LENGTH (i) - 1; | |
246 | gl_state.backward_i = i; | |
247 | } | |
248 | } | |
249 | } | |
250 | \f | |
251 | /* Returns TRUE if char at POS is quoted. | |
252 | Global syntax-table data should be set up already to be good at pos | |
253 | or after. On return global syntax data is good for lookup at POS. */ | |
254 | ||
255 | static int | |
256 | char_quoted (pos) | |
257 | register int pos; | |
258 | { | |
259 | register enum syntaxcode code; | |
260 | register int beg = BEGV; | |
261 | register int quoted = 0; | |
262 | int temp_pos = pos; | |
263 | ||
264 | DEC_POS (temp_pos); | |
265 | while (temp_pos >= beg | |
266 | && ( UPDATE_SYNTAX_TABLE_BACKWARD (temp_pos), 1) | |
267 | && ((code = SYNTAX (FETCH_CHAR (temp_pos))) == Scharquote | |
268 | || code == Sescape)) | |
269 | { | |
270 | temp_pos--, quoted = !quoted; | |
271 | } | |
272 | UPDATE_SYNTAX_TABLE (pos); | |
273 | return quoted; | |
274 | } | |
275 | \f | |
37bef230 RS |
276 | /* Find a defun-start that is the last one before POS (or nearly the last). |
277 | We record what we find, so that another call in the same area | |
195d1361 RS |
278 | can return the same value right away. |
279 | ||
280 | There is no promise at which position the global syntax data is | |
281 | valid on return from the subroutine, so the caller should explicitly | |
282 | update the global data. */ | |
37bef230 RS |
283 | |
284 | static int | |
285 | find_defun_start (pos) | |
286 | int pos; | |
287 | { | |
288 | int tem; | |
289 | int shortage; | |
290 | ||
291 | /* Use previous finding, if it's valid and applies to this inquiry. */ | |
292 | if (current_buffer == find_start_buffer | |
293 | /* Reuse the defun-start even if POS is a little farther on. | |
294 | POS might be in the next defun, but that's ok. | |
295 | Our value may not be the best possible, but will still be usable. */ | |
296 | && pos <= find_start_pos + 1000 | |
297 | && pos >= find_start_value | |
298 | && BEGV == find_start_begv | |
299 | && MODIFF == find_start_modiff) | |
300 | return find_start_value; | |
301 | ||
302 | /* Back up to start of line. */ | |
be5357e2 | 303 | tem = scan_buffer ('\n', pos, BEGV, -1, &shortage, 1); |
37bef230 | 304 | |
195d1361 RS |
305 | /* We optimize syntax-table lookup for rare updates. Thus we accept |
306 | only those `^\s(' which are good in global _and_ text-property | |
307 | syntax-tables. */ | |
308 | gl_state.current_syntax_table = current_buffer->syntax_table; | |
309 | gl_state.use_global = 0; | |
37bef230 RS |
310 | while (tem > BEGV) |
311 | { | |
312 | /* Open-paren at start of line means we found our defun-start. */ | |
313 | if (SYNTAX (FETCH_CHAR (tem)) == Sopen) | |
195d1361 RS |
314 | { |
315 | SETUP_SYNTAX_TABLE (tem + 1, -1); /* Try again... */ | |
316 | if (SYNTAX (FETCH_CHAR (tem)) == Sopen) | |
317 | break; | |
318 | /* Now fallback to the default value. */ | |
319 | gl_state.current_syntax_table = current_buffer->syntax_table; | |
320 | gl_state.use_global = 0; | |
321 | } | |
37bef230 | 322 | /* Move to beg of previous line. */ |
be5357e2 | 323 | tem = scan_buffer ('\n', tem, BEGV, -2, &shortage, 1); |
37bef230 RS |
324 | } |
325 | ||
326 | /* Record what we found, for the next try. */ | |
327 | find_start_value = tem; | |
328 | find_start_buffer = current_buffer; | |
329 | find_start_modiff = MODIFF; | |
330 | find_start_begv = BEGV; | |
331 | find_start_pos = pos; | |
332 | ||
333 | return find_start_value; | |
334 | } | |
335 | \f | |
195d1361 RS |
336 | /* Checks whether FROM is the end of comment. Does not try to |
337 | fallback more than to STOP. | |
338 | Returns -1 if cannot find comment ending at from, otherwise start | |
339 | of comment. Global syntax data remains valid for | |
340 | backward search starting at the returned value (or at FROM, if | |
341 | the search was not successful). */ | |
342 | ||
343 | static int | |
ea315ed6 RS |
344 | back_comment (from, stop, comstyle) |
345 | int from, stop, comstyle; | |
195d1361 RS |
346 | { |
347 | /* Look back, counting the parity of string-quotes, | |
348 | and recording the comment-starters seen. | |
349 | When we reach a safe place, assume that's not in a string; | |
350 | then step the main scan to the earliest comment-starter seen | |
351 | an even number of string quotes away from the safe place. | |
352 | ||
353 | OFROM[I] is position of the earliest comment-starter seen | |
354 | which is I+2X quotes from the comment-end. | |
355 | PARITY is current parity of quotes from the comment end. */ | |
356 | int parity = 0; | |
357 | int my_stringend = 0; | |
358 | int string_lossage = 0; | |
359 | int comment_end = from; | |
360 | int comstart_pos = 0; | |
361 | int comstart_parity = 0; | |
362 | int scanstart = from - 1; | |
363 | register enum syntaxcode code; | |
ea315ed6 | 364 | int c; |
195d1361 RS |
365 | |
366 | /* At beginning of range to scan, we're outside of strings; | |
367 | that determines quote parity to the comment-end. */ | |
368 | while (from != stop) | |
369 | { | |
370 | /* Move back and examine a character. */ | |
371 | DEC_POS (from); | |
372 | UPDATE_SYNTAX_TABLE_BACKWARD (from); | |
373 | ||
374 | c = FETCH_CHAR (from); | |
375 | code = SYNTAX (c); | |
376 | ||
377 | /* If this char is the second of a 2-char comment sequence, | |
378 | back up and give the pair the appropriate syntax. */ | |
379 | if (from > stop && SYNTAX_COMEND_SECOND (c) | |
380 | && SYNTAX_COMEND_FIRST (FETCH_CHAR (from - 1))) | |
381 | { | |
382 | code = Sendcomment; | |
383 | DEC_POS (from); | |
384 | /* This is apparently the best we can do: */ | |
385 | UPDATE_SYNTAX_TABLE_BACKWARD (from); | |
386 | c = FETCH_CHAR (from); | |
387 | } | |
388 | ||
389 | /* If this char starts a 2-char comment start sequence, | |
390 | treat it like a 1-char comment starter. */ | |
ea315ed6 RS |
391 | if (from < scanstart && SYNTAX_COMSTART_SECOND (c) |
392 | && SYNTAX_COMSTART_FIRST (FETCH_CHAR (from - 1)) | |
393 | && comstyle == SYNTAX_COMMENT_STYLE (c)) | |
394 | { | |
395 | code = Scomment; | |
396 | DEC_POS (from); | |
397 | /* This is apparently the best we can do: */ | |
398 | UPDATE_SYNTAX_TABLE_BACKWARD (from); | |
399 | c = FETCH_CHAR (from); | |
400 | } | |
195d1361 RS |
401 | |
402 | /* Ignore escaped characters. */ | |
403 | if (char_quoted (from)) | |
404 | continue; | |
405 | ||
406 | /* Track parity of quotes. */ | |
407 | if (code == Sstring) | |
408 | { | |
409 | parity ^= 1; | |
410 | if (my_stringend == 0) | |
411 | my_stringend = c; | |
412 | /* If we have two kinds of string delimiters. | |
413 | There's no way to grok this scanning backwards. */ | |
414 | else if (my_stringend != c) | |
415 | string_lossage = 1; | |
416 | } | |
417 | ||
418 | if (code == Sstring_fence || code == Scomment_fence) | |
419 | { | |
420 | parity ^= 1; | |
421 | if (my_stringend == 0) | |
422 | my_stringend = | |
423 | code == Sstring_fence ? ST_STRING_STYLE : ST_COMMENT_STYLE; | |
424 | /* If we have two kinds of string delimiters. | |
425 | There's no way to grok this scanning backwards. */ | |
426 | else if (my_stringend != (code == Sstring_fence | |
427 | ? ST_STRING_STYLE : ST_COMMENT_STYLE)) | |
428 | string_lossage = 1; | |
429 | } | |
430 | ||
431 | /* Record comment-starters according to that | |
432 | quote-parity to the comment-end. */ | |
433 | if (code == Scomment) | |
434 | { | |
435 | comstart_parity = parity; | |
436 | comstart_pos = from; | |
437 | } | |
438 | ||
439 | /* If we find another earlier comment-ender, | |
440 | any comment-starts earlier than that don't count | |
441 | (because they go with the earlier comment-ender). */ | |
442 | if (code == Sendcomment | |
443 | && SYNTAX_COMMENT_STYLE (FETCH_CHAR (from)) == comstyle) | |
444 | break; | |
445 | ||
446 | /* Assume a defun-start point is outside of strings. */ | |
447 | if (code == Sopen | |
448 | && (from == stop || FETCH_CHAR (from - 1) == '\n')) | |
449 | break; | |
450 | } | |
451 | ||
452 | if (comstart_pos == 0) | |
453 | { | |
454 | from = comment_end; | |
455 | UPDATE_SYNTAX_TABLE_FORWARD (comment_end - 1); | |
456 | } | |
457 | /* If the earliest comment starter | |
458 | is followed by uniform paired string quotes or none, | |
459 | we know it can't be inside a string | |
460 | since if it were then the comment ender would be inside one. | |
461 | So it does start a comment. Skip back to it. */ | |
462 | else if (comstart_parity == 0 && !string_lossage) | |
463 | { | |
464 | from = comstart_pos; | |
465 | /* Globals are correct now. */ | |
466 | } | |
467 | else | |
468 | { | |
469 | /* We had two kinds of string delimiters mixed up | |
470 | together. Decode this going forwards. | |
471 | Scan fwd from the previous comment ender | |
472 | to the one in question; this records where we | |
473 | last passed a comment starter. */ | |
474 | struct lisp_parse_state state; | |
475 | scan_sexps_forward (&state, find_defun_start (comment_end), | |
476 | comment_end - 1, -10000, 0, Qnil, 0); | |
477 | if (state.incomment) | |
478 | { | |
479 | /* scan_sexps_forward changed the direction of search in | |
480 | global variables, so we need to update it completely. */ | |
481 | ||
482 | from = state.comstr_start; | |
483 | } | |
484 | else | |
485 | { | |
486 | from = comment_end; | |
487 | } | |
488 | UPDATE_SYNTAX_TABLE_FORWARD (from - 1); | |
489 | } | |
490 | ||
491 | return from; | |
492 | } | |
493 | \f | |
8489eb67 | 494 | DEFUN ("syntax-table-p", Fsyntax_table_p, Ssyntax_table_p, 1, 1, 0, |
2203e1e8 | 495 | "Return t if OBJECT is a syntax table.\n\ |
8ea151b2 | 496 | Currently, any char-table counts as a syntax table.") |
2203e1e8 EN |
497 | (object) |
498 | Lisp_Object object; | |
8489eb67 | 499 | { |
2203e1e8 | 500 | if (CHAR_TABLE_P (object) |
e704cb4b | 501 | && EQ (XCHAR_TABLE (object)->purpose, Qsyntax_table)) |
8489eb67 RS |
502 | return Qt; |
503 | return Qnil; | |
504 | } | |
505 | ||
8ea151b2 | 506 | static void |
8489eb67 RS |
507 | check_syntax_table (obj) |
508 | Lisp_Object obj; | |
509 | { | |
d1be9f0f | 510 | if (!(CHAR_TABLE_P (obj) |
e704cb4b | 511 | && EQ (XCHAR_TABLE (obj)->purpose, Qsyntax_table))) |
d1be9f0f | 512 | wrong_type_argument (Qsyntax_table_p, obj); |
8489eb67 RS |
513 | } |
514 | ||
8489eb67 RS |
515 | DEFUN ("syntax-table", Fsyntax_table, Ssyntax_table, 0, 0, 0, |
516 | "Return the current syntax table.\n\ | |
517 | This is the one specified by the current buffer.") | |
518 | () | |
519 | { | |
520 | return current_buffer->syntax_table; | |
521 | } | |
522 | ||
523 | DEFUN ("standard-syntax-table", Fstandard_syntax_table, | |
524 | Sstandard_syntax_table, 0, 0, 0, | |
525 | "Return the standard syntax table.\n\ | |
526 | This is the one used for new buffers.") | |
527 | () | |
528 | { | |
529 | return Vstandard_syntax_table; | |
530 | } | |
531 | ||
532 | DEFUN ("copy-syntax-table", Fcopy_syntax_table, Scopy_syntax_table, 0, 1, 0, | |
533 | "Construct a new syntax table and return it.\n\ | |
534 | It is a copy of the TABLE, which defaults to the standard syntax table.") | |
535 | (table) | |
536 | Lisp_Object table; | |
537 | { | |
8ea151b2 RS |
538 | Lisp_Object copy; |
539 | ||
265a9e55 | 540 | if (!NILP (table)) |
8ea151b2 RS |
541 | check_syntax_table (table); |
542 | else | |
543 | table = Vstandard_syntax_table; | |
544 | ||
545 | copy = Fcopy_sequence (table); | |
0f867324 RS |
546 | |
547 | /* Only the standard syntax table should have a default element. | |
548 | Other syntax tables should inherit from parents instead. */ | |
549 | XCHAR_TABLE (copy)->defalt = Qnil; | |
550 | ||
551 | /* Copied syntax tables should all have parents. | |
552 | If we copied one with no parent, such as the standard syntax table, | |
553 | use the standard syntax table as the copy's parent. */ | |
554 | if (NILP (XCHAR_TABLE (copy)->parent)) | |
555 | Fset_char_table_parent (copy, Vstandard_syntax_table); | |
8ea151b2 | 556 | return copy; |
8489eb67 RS |
557 | } |
558 | ||
559 | DEFUN ("set-syntax-table", Fset_syntax_table, Sset_syntax_table, 1, 1, 0, | |
560 | "Select a new syntax table for the current buffer.\n\ | |
561 | One argument, a syntax table.") | |
562 | (table) | |
563 | Lisp_Object table; | |
564 | { | |
8ea151b2 | 565 | check_syntax_table (table); |
8489eb67 RS |
566 | current_buffer->syntax_table = table; |
567 | /* Indicate that this buffer now has a specified syntax table. */ | |
f110a664 RS |
568 | current_buffer->local_var_flags |
569 | |= XFASTINT (buffer_local_flags.syntax_table); | |
8489eb67 RS |
570 | return table; |
571 | } | |
572 | \f | |
573 | /* Convert a letter which signifies a syntax code | |
574 | into the code it signifies. | |
195d1361 | 575 | This is used by modify-syntax-entry, and other things. */ |
8489eb67 RS |
576 | |
577 | unsigned char syntax_spec_code[0400] = | |
578 | { 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
579 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
580 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
581 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
195d1361 | 582 | (char) Swhitespace, (char) Scomment_fence, (char) Sstring, 0377, |
8489eb67 RS |
583 | (char) Smath, 0377, 0377, (char) Squote, |
584 | (char) Sopen, (char) Sclose, 0377, 0377, | |
585 | 0377, (char) Swhitespace, (char) Spunct, (char) Scharquote, | |
586 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
587 | 0377, 0377, 0377, 0377, | |
588 | (char) Scomment, 0377, (char) Sendcomment, 0377, | |
6cb71bf6 | 589 | (char) Sinherit, 0377, 0377, 0377, 0377, 0377, 0377, 0377, /* @, A ... */ |
8489eb67 RS |
590 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, |
591 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, (char) Sword, | |
592 | 0377, 0377, 0377, 0377, (char) Sescape, 0377, 0377, (char) Ssymbol, | |
593 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, /* `, a, ... */ | |
594 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
595 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, (char) Sword, | |
195d1361 | 596 | 0377, 0377, 0377, 0377, (char) Sstring_fence, 0377, 0377, 0377 |
8489eb67 RS |
597 | }; |
598 | ||
195d1361 | 599 | /* Indexed by syntax code, give the letter that describes it. */ |
8489eb67 | 600 | |
195d1361 | 601 | char syntax_code_spec[16] = |
8489eb67 | 602 | { |
195d1361 RS |
603 | ' ', '.', 'w', '_', '(', ')', '\'', '\"', '$', '\\', '/', '<', '>', '@', |
604 | '!', '|' | |
8489eb67 | 605 | }; |
93da5fff KH |
606 | |
607 | /* Indexed by syntax code, give the object (cons of syntax code and | |
608 | nil) to be stored in syntax table. Since these objects can be | |
609 | shared among syntax tables, we generate them in advance. By | |
610 | sharing objects, the function `describe-syntax' can give a more | |
611 | compact listing. */ | |
612 | static Lisp_Object Vsyntax_code_object; | |
613 | ||
8489eb67 | 614 | \f |
8ea151b2 RS |
615 | /* Look up the value for CHARACTER in syntax table TABLE's parent |
616 | and its parents. SYNTAX_ENTRY calls this, when TABLE itself has nil | |
617 | for CHARACTER. It's actually used only when not compiled with GCC. */ | |
618 | ||
619 | Lisp_Object | |
620 | syntax_parent_lookup (table, character) | |
621 | Lisp_Object table; | |
622 | int character; | |
623 | { | |
624 | Lisp_Object value; | |
625 | ||
626 | while (1) | |
627 | { | |
628 | table = XCHAR_TABLE (table)->parent; | |
629 | if (NILP (table)) | |
630 | return Qnil; | |
631 | ||
632 | value = XCHAR_TABLE (table)->contents[character]; | |
633 | if (!NILP (value)) | |
634 | return value; | |
635 | } | |
636 | } | |
637 | ||
8489eb67 | 638 | DEFUN ("char-syntax", Fchar_syntax, Schar_syntax, 1, 1, 0, |
2203e1e8 EN |
639 | "Return the syntax code of CHARACTER, described by a character.\n\ |
640 | For example, if CHARACTER is a word constituent,\n\ | |
641 | the character `w' is returned.\n\ | |
8489eb67 RS |
642 | The characters that correspond to various syntax codes\n\ |
643 | are listed in the documentation of `modify-syntax-entry'.") | |
2203e1e8 EN |
644 | (character) |
645 | Lisp_Object character; | |
8489eb67 | 646 | { |
8ea151b2 | 647 | int char_int; |
195d1361 RS |
648 | gl_state.current_syntax_table = current_buffer->syntax_table; |
649 | ||
650 | gl_state.use_global = 0; | |
2203e1e8 EN |
651 | CHECK_NUMBER (character, 0); |
652 | char_int = XINT (character); | |
8ea151b2 | 653 | return make_number (syntax_code_spec[(int) SYNTAX (char_int)]); |
beefa22e RS |
654 | } |
655 | ||
656 | DEFUN ("matching-paren", Fmatching_paren, Smatching_paren, 1, 1, 0, | |
2203e1e8 EN |
657 | "Return the matching parenthesis of CHARACTER, or nil if none.") |
658 | (character) | |
659 | Lisp_Object character; | |
beefa22e | 660 | { |
8ea151b2 | 661 | int char_int, code; |
195d1361 RS |
662 | gl_state.current_syntax_table = current_buffer->syntax_table; |
663 | gl_state.use_global = 0; | |
2203e1e8 EN |
664 | CHECK_NUMBER (character, 0); |
665 | char_int = XINT (character); | |
8ea151b2 | 666 | code = SYNTAX (char_int); |
a8bd7cd8 | 667 | if (code == Sopen || code == Sclose) |
8ea151b2 | 668 | return make_number (SYNTAX_MATCH (char_int)); |
beefa22e | 669 | return Qnil; |
8489eb67 RS |
670 | } |
671 | ||
672 | /* This comment supplies the doc string for modify-syntax-entry, | |
673 | for make-docfile to see. We cannot put this in the real DEFUN | |
674 | due to limits in the Unix cpp. | |
675 | ||
2fcea188 | 676 | DEFUN ("modify-syntax-entry", foo, bar, 2, 3, 0, |
8489eb67 RS |
677 | "Set syntax for character CHAR according to string S.\n\ |
678 | The syntax is changed only for table TABLE, which defaults to\n\ | |
679 | the current buffer's syntax table.\n\ | |
680 | The first character of S should be one of the following:\n\ | |
32676c08 JB |
681 | Space or - whitespace syntax. w word constituent.\n\ |
682 | _ symbol constituent. . punctuation.\n\ | |
683 | ( open-parenthesis. ) close-parenthesis.\n\ | |
684 | \" string quote. \\ escape.\n\ | |
685 | $ paired delimiter. ' expression quote or prefix operator.\n\ | |
abae13bd | 686 | < comment starter. > comment ender.\n\ |
6cb71bf6 | 687 | / character-quote. @ inherit from `standard-syntax-table'.\n\ |
abae13bd | 688 | \n\ |
8489eb67 RS |
689 | Only single-character comment start and end sequences are represented thus.\n\ |
690 | Two-character sequences are represented as described below.\n\ | |
691 | The second character of S is the matching parenthesis,\n\ | |
692 | used only if the first character is `(' or `)'.\n\ | |
693 | Any additional characters are flags.\n\ | |
e5d4f4dc | 694 | Defined flags are the characters 1, 2, 3, 4, b, and p.\n\ |
2203e1e8 EN |
695 | 1 means CHAR is the start of a two-char comment start sequence.\n\ |
696 | 2 means CHAR is the second character of such a sequence.\n\ | |
697 | 3 means CHAR is the start of a two-char comment end sequence.\n\ | |
698 | 4 means CHAR is the second character of such a sequence.\n\ | |
e5d4f4dc | 699 | \n\ |
195d1361 | 700 | There can be up to two orthogonal comment sequences. This is to support\n\ |
e5d4f4dc | 701 | language modes such as C++. By default, all comment sequences are of style\n\ |
abae13bd RS |
702 | a, but you can set the comment sequence style to b (on the second character\n\ |
703 | of a comment-start, or the first character of a comment-end sequence) using\n\ | |
e5d4f4dc | 704 | this flag:\n\ |
2203e1e8 | 705 | b means CHAR is part of comment sequence b.\n\ |
e5d4f4dc | 706 | \n\ |
2203e1e8 | 707 | p means CHAR is a prefix character for `backward-prefix-chars';\n\ |
e5d4f4dc | 708 | such characters are treated as whitespace when they occur\n\ |
8489eb67 | 709 | between expressions.") |
2fcea188 | 710 | (char, s, table) |
8489eb67 RS |
711 | */ |
712 | ||
713 | DEFUN ("modify-syntax-entry", Fmodify_syntax_entry, Smodify_syntax_entry, 2, 3, | |
714 | /* I really don't know why this is interactive | |
715 | help-form should at least be made useful whilst reading the second arg | |
716 | */ | |
717 | "cSet syntax for character: \nsSet syntax for %s to: ", | |
718 | 0 /* See immediately above */) | |
719 | (c, newentry, syntax_table) | |
720 | Lisp_Object c, newentry, syntax_table; | |
721 | { | |
8ea151b2 | 722 | register unsigned char *p; |
8489eb67 | 723 | register enum syntaxcode code; |
247e20a8 | 724 | int val; |
8ea151b2 | 725 | Lisp_Object match; |
8489eb67 RS |
726 | |
727 | CHECK_NUMBER (c, 0); | |
728 | CHECK_STRING (newentry, 1); | |
8ea151b2 | 729 | |
265a9e55 | 730 | if (NILP (syntax_table)) |
8489eb67 RS |
731 | syntax_table = current_buffer->syntax_table; |
732 | else | |
8ea151b2 | 733 | check_syntax_table (syntax_table); |
8489eb67 RS |
734 | |
735 | p = XSTRING (newentry)->data; | |
736 | code = (enum syntaxcode) syntax_spec_code[*p++]; | |
737 | if (((int) code & 0377) == 0377) | |
e704cb4b | 738 | error ("invalid syntax description letter: %c", XINT (c)); |
8489eb67 | 739 | |
8ea151b2 RS |
740 | if (code == Sinherit) |
741 | { | |
e704cb4b | 742 | SET_RAW_SYNTAX_ENTRY (syntax_table, XINT (c), Qnil); |
8ea151b2 RS |
743 | return Qnil; |
744 | } | |
745 | ||
746 | if (*p) | |
d1be9f0f | 747 | { |
93da5fff KH |
748 | int len; |
749 | int character = STRING_CHAR_AND_LENGTH (p, XSTRING (newentry)->size - 1, | |
750 | len); | |
751 | XSETINT (match, character); | |
d1be9f0f RS |
752 | if (XFASTINT (match) == ' ') |
753 | match = Qnil; | |
93da5fff | 754 | p += len; |
d1be9f0f RS |
755 | } |
756 | else | |
8ea151b2 | 757 | match = Qnil; |
8489eb67 | 758 | |
8ea151b2 | 759 | val = (int) code; |
8489eb67 RS |
760 | while (*p) |
761 | switch (*p++) | |
762 | { | |
763 | case '1': | |
247e20a8 | 764 | val |= 1 << 16; |
8489eb67 RS |
765 | break; |
766 | ||
767 | case '2': | |
247e20a8 | 768 | val |= 1 << 17; |
8489eb67 RS |
769 | break; |
770 | ||
771 | case '3': | |
247e20a8 | 772 | val |= 1 << 18; |
8489eb67 RS |
773 | break; |
774 | ||
775 | case '4': | |
247e20a8 | 776 | val |= 1 << 19; |
8489eb67 RS |
777 | break; |
778 | ||
779 | case 'p': | |
247e20a8 | 780 | val |= 1 << 20; |
8489eb67 | 781 | break; |
e5d4f4dc RS |
782 | |
783 | case 'b': | |
247e20a8 | 784 | val |= 1 << 21; |
e5d4f4dc | 785 | break; |
8489eb67 RS |
786 | } |
787 | ||
93da5fff KH |
788 | if (val < XVECTOR (Vsyntax_code_object)->size && NILP (match)) |
789 | newentry = XVECTOR (Vsyntax_code_object)->contents[val]; | |
790 | else | |
791 | /* Since we can't use a shared object, let's make a new one. */ | |
792 | newentry = Fcons (make_number (val), match); | |
793 | ||
e704cb4b | 794 | SET_RAW_SYNTAX_ENTRY (syntax_table, XINT (c), newentry); |
8489eb67 RS |
795 | |
796 | return Qnil; | |
797 | } | |
798 | \f | |
799 | /* Dump syntax table to buffer in human-readable format */ | |
800 | ||
340f92b5 | 801 | static void |
8489eb67 RS |
802 | describe_syntax (value) |
803 | Lisp_Object value; | |
804 | { | |
805 | register enum syntaxcode code; | |
e5d4f4dc | 806 | char desc, match, start1, start2, end1, end2, prefix, comstyle; |
8489eb67 | 807 | char str[2]; |
8ea151b2 | 808 | Lisp_Object first, match_lisp; |
8489eb67 RS |
809 | |
810 | Findent_to (make_number (16), make_number (1)); | |
811 | ||
8ea151b2 RS |
812 | if (NILP (value)) |
813 | { | |
93da5fff | 814 | insert_string ("default\n"); |
8ea151b2 RS |
815 | return; |
816 | } | |
817 | ||
908b7fea KH |
818 | if (CHAR_TABLE_P (value)) |
819 | { | |
820 | insert_string ("deeper char-table ...\n"); | |
821 | return; | |
822 | } | |
823 | ||
8ea151b2 RS |
824 | if (!CONSP (value)) |
825 | { | |
93da5fff | 826 | insert_string ("invalid\n"); |
8ea151b2 RS |
827 | return; |
828 | } | |
829 | ||
830 | first = XCONS (value)->car; | |
831 | match_lisp = XCONS (value)->cdr; | |
832 | ||
833 | if (!INTEGERP (first) || !(NILP (match_lisp) || INTEGERP (match_lisp))) | |
8489eb67 | 834 | { |
93da5fff | 835 | insert_string ("invalid\n"); |
8489eb67 RS |
836 | return; |
837 | } | |
838 | ||
e704cb4b | 839 | code = (enum syntaxcode) (XINT (first) & 0377); |
8ea151b2 RS |
840 | start1 = (XINT (first) >> 16) & 1; |
841 | start2 = (XINT (first) >> 17) & 1; | |
842 | end1 = (XINT (first) >> 18) & 1; | |
843 | end2 = (XINT (first) >> 19) & 1; | |
844 | prefix = (XINT (first) >> 20) & 1; | |
845 | comstyle = (XINT (first) >> 21) & 1; | |
8489eb67 RS |
846 | |
847 | if ((int) code < 0 || (int) code >= (int) Smax) | |
848 | { | |
849 | insert_string ("invalid"); | |
850 | return; | |
851 | } | |
852 | desc = syntax_code_spec[(int) code]; | |
853 | ||
854 | str[0] = desc, str[1] = 0; | |
855 | insert (str, 1); | |
856 | ||
93da5fff KH |
857 | if (NILP (match_lisp)) |
858 | insert (" ", 1); | |
859 | else | |
860 | insert_char (XINT (match_lisp)); | |
8489eb67 | 861 | |
8489eb67 RS |
862 | if (start1) |
863 | insert ("1", 1); | |
864 | if (start2) | |
865 | insert ("2", 1); | |
866 | ||
867 | if (end1) | |
868 | insert ("3", 1); | |
869 | if (end2) | |
870 | insert ("4", 1); | |
871 | ||
872 | if (prefix) | |
873 | insert ("p", 1); | |
e5d4f4dc RS |
874 | if (comstyle) |
875 | insert ("b", 1); | |
8489eb67 RS |
876 | |
877 | insert_string ("\twhich means: "); | |
878 | ||
0220c518 | 879 | switch (SWITCH_ENUM_CAST (code)) |
8489eb67 RS |
880 | { |
881 | case Swhitespace: | |
882 | insert_string ("whitespace"); break; | |
883 | case Spunct: | |
884 | insert_string ("punctuation"); break; | |
885 | case Sword: | |
886 | insert_string ("word"); break; | |
887 | case Ssymbol: | |
888 | insert_string ("symbol"); break; | |
889 | case Sopen: | |
890 | insert_string ("open"); break; | |
891 | case Sclose: | |
892 | insert_string ("close"); break; | |
893 | case Squote: | |
894 | insert_string ("quote"); break; | |
895 | case Sstring: | |
896 | insert_string ("string"); break; | |
897 | case Smath: | |
898 | insert_string ("math"); break; | |
899 | case Sescape: | |
900 | insert_string ("escape"); break; | |
901 | case Scharquote: | |
902 | insert_string ("charquote"); break; | |
903 | case Scomment: | |
904 | insert_string ("comment"); break; | |
905 | case Sendcomment: | |
906 | insert_string ("endcomment"); break; | |
907 | default: | |
908 | insert_string ("invalid"); | |
909 | return; | |
910 | } | |
911 | ||
8ea151b2 | 912 | if (!NILP (match_lisp)) |
8489eb67 RS |
913 | { |
914 | insert_string (", matches "); | |
8ea151b2 | 915 | insert_char (XINT (match_lisp)); |
8489eb67 RS |
916 | } |
917 | ||
918 | if (start1) | |
919 | insert_string (",\n\t is the first character of a comment-start sequence"); | |
920 | if (start2) | |
921 | insert_string (",\n\t is the second character of a comment-start sequence"); | |
922 | ||
923 | if (end1) | |
924 | insert_string (",\n\t is the first character of a comment-end sequence"); | |
925 | if (end2) | |
926 | insert_string (",\n\t is the second character of a comment-end sequence"); | |
e5d4f4dc RS |
927 | if (comstyle) |
928 | insert_string (" (comment style b)"); | |
929 | ||
8489eb67 RS |
930 | if (prefix) |
931 | insert_string (",\n\t is a prefix character for `backward-prefix-chars'"); | |
932 | ||
933 | insert_string ("\n"); | |
934 | } | |
935 | ||
340f92b5 | 936 | static Lisp_Object |
8489eb67 RS |
937 | describe_syntax_1 (vector) |
938 | Lisp_Object vector; | |
939 | { | |
940 | struct buffer *old = current_buffer; | |
941 | set_buffer_internal (XBUFFER (Vstandard_output)); | |
e41819d4 | 942 | describe_vector (vector, Qnil, describe_syntax, 0, Qnil, Qnil, (int *) 0, 0); |
93da5fff KH |
943 | while (! NILP (XCHAR_TABLE (vector)->parent)) |
944 | { | |
945 | vector = XCHAR_TABLE (vector)->parent; | |
946 | insert_string ("\nThe parent syntax table is:"); | |
e41819d4 RS |
947 | describe_vector (vector, Qnil, describe_syntax, 0, Qnil, Qnil, |
948 | (int *) 0, 0); | |
93da5fff KH |
949 | } |
950 | ||
36cd82fe | 951 | call0 (intern ("help-mode")); |
8489eb67 RS |
952 | set_buffer_internal (old); |
953 | return Qnil; | |
954 | } | |
955 | ||
956 | DEFUN ("describe-syntax", Fdescribe_syntax, Sdescribe_syntax, 0, 0, "", | |
957 | "Describe the syntax specifications in the syntax table.\n\ | |
958 | The descriptions are inserted in a buffer, which is then displayed.") | |
959 | () | |
960 | { | |
961 | internal_with_output_to_temp_buffer | |
962 | ("*Help*", describe_syntax_1, current_buffer->syntax_table); | |
963 | ||
964 | return Qnil; | |
965 | } | |
966 | \f | |
195d1361 RS |
967 | int parse_sexp_ignore_comments; |
968 | ||
8489eb67 RS |
969 | /* Return the position across COUNT words from FROM. |
970 | If that many words cannot be found before the end of the buffer, return 0. | |
971 | COUNT negative means scan backward and stop at word beginning. */ | |
972 | ||
973 | scan_words (from, count) | |
974 | register int from, count; | |
975 | { | |
976 | register int beg = BEGV; | |
977 | register int end = ZV; | |
93da5fff KH |
978 | register enum syntaxcode code; |
979 | int ch0, ch1; | |
980 | int temp_pos; | |
8489eb67 RS |
981 | |
982 | immediate_quit = 1; | |
983 | QUIT; | |
984 | ||
195d1361 RS |
985 | SETUP_SYNTAX_TABLE (from, count); |
986 | ||
8489eb67 RS |
987 | while (count > 0) |
988 | { | |
989 | while (1) | |
990 | { | |
991 | if (from == end) | |
992 | { | |
993 | immediate_quit = 0; | |
994 | return 0; | |
995 | } | |
195d1361 | 996 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
93da5fff KH |
997 | ch0 = FETCH_CHAR (from); |
998 | code = SYNTAX (ch0); | |
999 | INC_POS (from); | |
8489eb67 RS |
1000 | if (words_include_escapes |
1001 | && (code == Sescape || code == Scharquote)) | |
1002 | break; | |
1003 | if (code == Sword) | |
1004 | break; | |
8489eb67 | 1005 | } |
93da5fff KH |
1006 | /* Now CH0 is a character which begins a word and FROM is the |
1007 | position of the next character. */ | |
8489eb67 RS |
1008 | while (1) |
1009 | { | |
1010 | if (from == end) break; | |
195d1361 | 1011 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
93da5fff KH |
1012 | ch1 = FETCH_CHAR (from); |
1013 | code = SYNTAX (ch1); | |
8489eb67 RS |
1014 | if (!(words_include_escapes |
1015 | && (code == Sescape || code == Scharquote))) | |
93da5fff | 1016 | if (code != Sword || WORD_BOUNDARY_P (ch0, ch1)) |
8489eb67 | 1017 | break; |
93da5fff KH |
1018 | INC_POS (from); |
1019 | ch0 = ch1; | |
8489eb67 RS |
1020 | } |
1021 | count--; | |
1022 | } | |
1023 | while (count < 0) | |
1024 | { | |
1025 | while (1) | |
1026 | { | |
1027 | if (from == beg) | |
1028 | { | |
1029 | immediate_quit = 0; | |
1030 | return 0; | |
1031 | } | |
93da5fff | 1032 | DEC_POS (from); |
195d1361 | 1033 | UPDATE_SYNTAX_TABLE_BACKWARD (from); |
93da5fff KH |
1034 | ch1 = FETCH_CHAR (from); |
1035 | code = SYNTAX (ch1); | |
8489eb67 RS |
1036 | if (words_include_escapes |
1037 | && (code == Sescape || code == Scharquote)) | |
1038 | break; | |
1039 | if (code == Sword) | |
1040 | break; | |
8489eb67 | 1041 | } |
93da5fff KH |
1042 | /* Now CH1 is a character which ends a word and FROM is the |
1043 | position of it. */ | |
8489eb67 RS |
1044 | while (1) |
1045 | { | |
1046 | if (from == beg) break; | |
93da5fff KH |
1047 | temp_pos = from; |
1048 | DEC_POS (temp_pos); | |
195d1361 | 1049 | UPDATE_SYNTAX_TABLE_BACKWARD (from); |
93da5fff KH |
1050 | ch0 = FETCH_CHAR (temp_pos); |
1051 | code = SYNTAX (ch0); | |
8489eb67 RS |
1052 | if (!(words_include_escapes |
1053 | && (code == Sescape || code == Scharquote))) | |
93da5fff | 1054 | if (code != Sword || WORD_BOUNDARY_P (ch0, ch1)) |
8489eb67 | 1055 | break; |
93da5fff KH |
1056 | from = temp_pos; |
1057 | ch1 = ch0; | |
8489eb67 RS |
1058 | } |
1059 | count++; | |
1060 | } | |
1061 | ||
1062 | immediate_quit = 0; | |
1063 | ||
1064 | return from; | |
1065 | } | |
1066 | ||
1067 | DEFUN ("forward-word", Fforward_word, Sforward_word, 1, 1, "p", | |
1068 | "Move point forward ARG words (backward if ARG is negative).\n\ | |
1069 | Normally returns t.\n\ | |
1070 | If an edge of the buffer is reached, point is left there\n\ | |
1071 | and nil is returned.") | |
1072 | (count) | |
1073 | Lisp_Object count; | |
1074 | { | |
1075 | int val; | |
1076 | CHECK_NUMBER (count, 0); | |
1077 | ||
6ec8bbd2 | 1078 | if (!(val = scan_words (PT, XINT (count)))) |
8489eb67 RS |
1079 | { |
1080 | SET_PT (XINT (count) > 0 ? ZV : BEGV); | |
1081 | return Qnil; | |
1082 | } | |
1083 | SET_PT (val); | |
1084 | return Qt; | |
1085 | } | |
1086 | \f | |
195d1361 RS |
1087 | Lisp_Object skip_chars (); |
1088 | ||
1089 | DEFUN ("skip-chars-forward", Fskip_chars_forward, Sskip_chars_forward, 1, 2, 0, | |
1090 | "Move point forward, stopping before a char not in STRING, or at pos LIM.\n\ | |
1091 | STRING is like the inside of a `[...]' in a regular expression\n\ | |
1092 | except that `]' is never special and `\\' quotes `^', `-' or `\\'.\n\ | |
1093 | Thus, with arg \"a-zA-Z\", this skips letters stopping before first nonletter.\n\ | |
1094 | With arg \"^a-zA-Z\", skips nonletters stopping before first letter.\n\ | |
1095 | Returns the distance traveled, either zero or positive.") | |
1096 | (string, lim) | |
1097 | Lisp_Object string, lim; | |
1098 | { | |
1099 | return skip_chars (1, 0, string, lim); | |
1100 | } | |
1101 | ||
1102 | DEFUN ("skip-chars-backward", Fskip_chars_backward, Sskip_chars_backward, 1, 2, 0, | |
1103 | "Move point backward, stopping after a char not in STRING, or at pos LIM.\n\ | |
1104 | See `skip-chars-forward' for details.\n\ | |
1105 | Returns the distance traveled, either zero or negative.") | |
1106 | (string, lim) | |
1107 | Lisp_Object string, lim; | |
1108 | { | |
1109 | return skip_chars (0, 0, string, lim); | |
1110 | } | |
1111 | ||
1112 | DEFUN ("skip-syntax-forward", Fskip_syntax_forward, Sskip_syntax_forward, 1, 2, 0, | |
1113 | "Move point forward across chars in specified syntax classes.\n\ | |
1114 | SYNTAX is a string of syntax code characters.\n\ | |
1115 | Stop before a char whose syntax is not in SYNTAX, or at position LIM.\n\ | |
1116 | If SYNTAX starts with ^, skip characters whose syntax is NOT in SYNTAX.\n\ | |
1117 | This function returns the distance traveled, either zero or positive.") | |
1118 | (syntax, lim) | |
1119 | Lisp_Object syntax, lim; | |
1120 | { | |
1121 | return skip_chars (1, 1, syntax, lim); | |
1122 | } | |
1123 | ||
1124 | DEFUN ("skip-syntax-backward", Fskip_syntax_backward, Sskip_syntax_backward, 1, 2, 0, | |
1125 | "Move point backward across chars in specified syntax classes.\n\ | |
1126 | SYNTAX is a string of syntax code characters.\n\ | |
1127 | Stop on reaching a char whose syntax is not in SYNTAX, or at position LIM.\n\ | |
1128 | If SYNTAX starts with ^, skip characters whose syntax is NOT in SYNTAX.\n\ | |
1129 | This function returns the distance traveled, either zero or negative.") | |
1130 | (syntax, lim) | |
1131 | Lisp_Object syntax, lim; | |
1132 | { | |
1133 | return skip_chars (0, 1, syntax, lim); | |
1134 | } | |
1135 | ||
1136 | Lisp_Object | |
1137 | skip_chars (forwardp, syntaxp, string, lim) | |
1138 | int forwardp, syntaxp; | |
1139 | Lisp_Object string, lim; | |
1140 | { | |
1141 | register unsigned char *p, *pend; | |
1142 | register unsigned int c; | |
7e68b0ea | 1143 | register int ch; |
195d1361 | 1144 | unsigned char fastmap[0400]; |
7e68b0ea RS |
1145 | /* If SYNTAXP is 0, STRING may contain multi-byte form of characters |
1146 | of which codes don't fit in FASTMAP. In that case, we set the | |
1147 | first byte of multibyte form (i.e. base leading-code) in FASTMAP | |
1148 | and set the actual ranges of characters in CHAR_RANGES. In the | |
1149 | form "X-Y" of STRING, both X and Y must belong to the same | |
1150 | character set because a range striding across character sets is | |
1151 | meaningless. */ | |
1152 | int *char_ranges | |
1153 | = (int *) alloca (XSTRING (string)->size * (sizeof (int)) * 2); | |
1154 | int n_char_ranges = 0; | |
195d1361 RS |
1155 | int negate = 0; |
1156 | register int i; | |
7e68b0ea | 1157 | int multibyte = !NILP (current_buffer->enable_multibyte_characters); |
195d1361 RS |
1158 | |
1159 | CHECK_STRING (string, 0); | |
1160 | ||
1161 | if (NILP (lim)) | |
1162 | XSETINT (lim, forwardp ? ZV : BEGV); | |
1163 | else | |
1164 | CHECK_NUMBER_COERCE_MARKER (lim, 1); | |
1165 | ||
1166 | /* In any case, don't allow scan outside bounds of buffer. */ | |
1167 | /* jla turned this off, for no known reason. | |
1168 | bfox turned the ZV part on, and rms turned the | |
1169 | BEGV part back on. */ | |
1170 | if (XINT (lim) > ZV) | |
1171 | XSETFASTINT (lim, ZV); | |
1172 | if (XINT (lim) < BEGV) | |
1173 | XSETFASTINT (lim, BEGV); | |
1174 | ||
1175 | p = XSTRING (string)->data; | |
1176 | pend = p + XSTRING (string)->size; | |
1177 | bzero (fastmap, sizeof fastmap); | |
1178 | ||
1179 | if (p != pend && *p == '^') | |
1180 | { | |
1181 | negate = 1; p++; | |
1182 | } | |
1183 | ||
1184 | /* Find the characters specified and set their elements of fastmap. | |
1185 | If syntaxp, each character counts as itself. | |
1186 | Otherwise, handle backslashes and ranges specially. */ | |
1187 | ||
1188 | while (p != pend) | |
1189 | { | |
7e68b0ea RS |
1190 | c = *p; |
1191 | if (multibyte) | |
1192 | { | |
1193 | ch = STRING_CHAR (p, pend - p); | |
1194 | p += BYTES_BY_CHAR_HEAD (*p); | |
1195 | } | |
1196 | else | |
1197 | { | |
1198 | ch = c; | |
1199 | p++; | |
1200 | } | |
195d1361 RS |
1201 | if (syntaxp) |
1202 | fastmap[syntax_spec_code[c]] = 1; | |
1203 | else | |
1204 | { | |
1205 | if (c == '\\') | |
1206 | { | |
1207 | if (p == pend) break; | |
1208 | c = *p++; | |
1209 | } | |
1210 | if (p != pend && *p == '-') | |
1211 | { | |
7e68b0ea RS |
1212 | unsigned int ch2; |
1213 | ||
195d1361 RS |
1214 | p++; |
1215 | if (p == pend) break; | |
7e68b0ea RS |
1216 | if (SINGLE_BYTE_CHAR_P (ch)) |
1217 | while (c <= *p) | |
1218 | { | |
1219 | fastmap[c] = 1; | |
1220 | c++; | |
1221 | } | |
1222 | else | |
195d1361 | 1223 | { |
7e68b0ea RS |
1224 | fastmap[c] = 1; /* C is the base leading-code. */ |
1225 | ch2 = STRING_CHAR (p, pend - p); | |
1226 | if (ch <= ch2) | |
1227 | char_ranges[n_char_ranges++] = ch, | |
1228 | char_ranges[n_char_ranges++] = ch2; | |
195d1361 | 1229 | } |
7e68b0ea | 1230 | p += multibyte ? BYTES_BY_CHAR_HEAD (*p) : 1; |
195d1361 RS |
1231 | } |
1232 | else | |
7e68b0ea RS |
1233 | { |
1234 | fastmap[c] = 1; | |
1235 | if (!SINGLE_BYTE_CHAR_P (ch)) | |
1236 | { | |
1237 | char_ranges[n_char_ranges++] = ch; | |
1238 | char_ranges[n_char_ranges++] = ch; | |
1239 | } | |
1240 | } | |
195d1361 RS |
1241 | } |
1242 | } | |
1243 | ||
7e68b0ea RS |
1244 | /* If ^ was the first character, complement the fastmap. In |
1245 | addition, as all multibyte characters have possibility of | |
1246 | matching, set all entries for base leading codes, which is | |
1247 | harmless even if SYNTAXP is 1. */ | |
195d1361 RS |
1248 | |
1249 | if (negate) | |
1250 | for (i = 0; i < sizeof fastmap; i++) | |
7e68b0ea RS |
1251 | { |
1252 | if (!multibyte || !BASE_LEADING_CODE_P (i)) | |
1253 | fastmap[i] ^= 1; | |
1254 | else | |
1255 | fastmap[i] = 1; | |
1256 | } | |
195d1361 RS |
1257 | |
1258 | { | |
1259 | int start_point = PT; | |
1260 | int pos = PT; | |
1261 | ||
1262 | immediate_quit = 1; | |
1263 | if (syntaxp) | |
1264 | { | |
1265 | SETUP_SYNTAX_TABLE (pos, forwardp ? 1 : -1); | |
1266 | if (forwardp) | |
1267 | { | |
7e68b0ea | 1268 | if (multibyte) |
195d1361 | 1269 | { |
7e68b0ea RS |
1270 | while (pos < XINT (lim) |
1271 | && fastmap[(int) SYNTAX (FETCH_CHAR (pos))]) | |
1272 | { | |
1273 | INC_POS (pos); | |
1274 | UPDATE_SYNTAX_TABLE_FORWARD (pos); | |
1275 | } | |
1276 | } | |
1277 | else | |
1278 | { | |
1279 | while (pos < XINT (lim) | |
1280 | && fastmap[(int) SYNTAX (FETCH_BYTE (pos))]) | |
1281 | { | |
1282 | pos++; | |
1283 | UPDATE_SYNTAX_TABLE_FORWARD (pos); | |
1284 | } | |
195d1361 RS |
1285 | } |
1286 | } | |
1287 | else | |
1288 | { | |
7e68b0ea | 1289 | if (multibyte) |
195d1361 | 1290 | { |
7e68b0ea RS |
1291 | while (pos > XINT (lim)) |
1292 | { | |
1293 | int savepos = pos; | |
1294 | DEC_POS (pos); | |
4c8535eb | 1295 | UPDATE_SYNTAX_TABLE_BACKWARD (pos); |
7e68b0ea RS |
1296 | if (!fastmap[(int) SYNTAX (FETCH_CHAR (pos))]) |
1297 | { | |
1298 | pos = savepos; | |
1299 | break; | |
1300 | } | |
7e68b0ea RS |
1301 | } |
1302 | } | |
1303 | else | |
1304 | { | |
4c8535eb | 1305 | while (pos > XINT (lim)) |
7e68b0ea RS |
1306 | { |
1307 | pos--; | |
4c8535eb RS |
1308 | UPDATE_SYNTAX_TABLE_BACKWARD (pos); |
1309 | if (!fastmap[(int) SYNTAX (FETCH_BYTE (pos))]) | |
1310 | { | |
1311 | pos++; | |
1312 | break; | |
1313 | } | |
7e68b0ea | 1314 | } |
195d1361 RS |
1315 | } |
1316 | } | |
1317 | } | |
1318 | else | |
1319 | { | |
1320 | if (forwardp) | |
1321 | { | |
7e68b0ea RS |
1322 | if (multibyte) |
1323 | while (pos < XINT (lim) && fastmap[(c = FETCH_BYTE (pos))]) | |
1324 | { | |
1325 | if (!BASE_LEADING_CODE_P (c)) | |
1326 | pos++; | |
1327 | else if (n_char_ranges) | |
1328 | { | |
1329 | /* We much check CHAR_RANGES for a multibyte | |
1330 | character. */ | |
1331 | ch = FETCH_MULTIBYTE_CHAR (pos); | |
1332 | for (i = 0; i < n_char_ranges; i += 2) | |
1333 | if ((ch >= char_ranges[i] && ch <= char_ranges[i + 1])) | |
1334 | break; | |
1335 | if (!(negate ^ (i < n_char_ranges))) | |
1336 | break; | |
1337 | ||
1338 | INC_POS (pos); | |
1339 | } | |
1340 | else | |
1341 | { | |
1342 | if (!negate) break; | |
1343 | INC_POS (pos); | |
1344 | } | |
1345 | } | |
1346 | else | |
1347 | while (pos < XINT (lim) && fastmap[FETCH_BYTE (pos)]) | |
1348 | pos++; | |
195d1361 RS |
1349 | } |
1350 | else | |
1351 | { | |
7e68b0ea RS |
1352 | if (multibyte) |
1353 | while (pos > XINT (lim)) | |
1354 | { | |
1355 | int savepos = pos; | |
1356 | DEC_POS (pos); | |
1357 | if (fastmap[(c = FETCH_BYTE (pos))]) | |
1358 | { | |
1359 | if (!BASE_LEADING_CODE_P (c)) | |
1360 | ; | |
1361 | else if (n_char_ranges) | |
1362 | { | |
1363 | /* We much check CHAR_RANGES for a multibyte | |
1364 | character. */ | |
1365 | ch = FETCH_MULTIBYTE_CHAR (pos); | |
1366 | for (i = 0; i < n_char_ranges; i += 2) | |
1367 | if (ch >= char_ranges[i] && ch <= char_ranges[i + 1]) | |
1368 | break; | |
1369 | if (!(negate ^ (i < n_char_ranges))) | |
1370 | { | |
1371 | pos = savepos; | |
1372 | break; | |
1373 | } | |
1374 | } | |
1375 | else | |
1376 | if (!negate) | |
1377 | { | |
1378 | pos = savepos; | |
1379 | break; | |
1380 | } | |
1381 | } | |
1382 | else | |
1383 | { | |
1384 | pos = savepos; | |
1385 | break; | |
1386 | } | |
1387 | } | |
1388 | else | |
1389 | while (pos > XINT (lim) && fastmap[FETCH_BYTE (pos - 1)]) | |
1390 | pos--; | |
195d1361 RS |
1391 | } |
1392 | } | |
7e68b0ea RS |
1393 | |
1394 | if (multibyte | |
1395 | /* INC_POS or DEC_POS might have moved POS over LIM. */ | |
1396 | && (forwardp ? (pos > XINT (lim)) : (pos < XINT (lim)))) | |
1397 | pos = XINT (lim); | |
1398 | ||
195d1361 RS |
1399 | SET_PT (pos); |
1400 | immediate_quit = 0; | |
1401 | ||
1402 | return make_number (PT - start_point); | |
1403 | } | |
1404 | } | |
1405 | \f | |
b3cfe0c8 RS |
1406 | DEFUN ("forward-comment", Fforward_comment, Sforward_comment, 1, 1, 0, |
1407 | "Move forward across up to N comments. If N is negative, move backward.\n\ | |
b3cfe0c8 | 1408 | Stop scanning if we find something other than a comment or whitespace.\n\ |
c81a3712 | 1409 | Set point to where scanning stops.\n\ |
b3cfe0c8 RS |
1410 | If N comments are found as expected, with nothing except whitespace\n\ |
1411 | between them, return t; otherwise return nil.") | |
1412 | (count) | |
840f481c | 1413 | Lisp_Object count; |
b3cfe0c8 RS |
1414 | { |
1415 | register int from; | |
1416 | register int stop; | |
8ea151b2 | 1417 | register int c, c1; |
b3cfe0c8 RS |
1418 | register enum syntaxcode code; |
1419 | int comstyle = 0; /* style of comment encountered */ | |
be720845 | 1420 | int found; |
840f481c | 1421 | int count1; |
93da5fff | 1422 | int temp_pos; |
840f481c RS |
1423 | |
1424 | CHECK_NUMBER (count, 0); | |
1425 | count1 = XINT (count); | |
195d1361 | 1426 | stop = count1 > 0 ? ZV : BEGV; |
b3cfe0c8 RS |
1427 | |
1428 | immediate_quit = 1; | |
1429 | QUIT; | |
1430 | ||
1431 | from = PT; | |
1432 | ||
195d1361 | 1433 | SETUP_SYNTAX_TABLE (from, count1); |
840f481c | 1434 | while (count1 > 0) |
b3cfe0c8 | 1435 | { |
04882296 | 1436 | do |
b3cfe0c8 | 1437 | { |
04882296 KH |
1438 | if (from == stop) |
1439 | { | |
1440 | SET_PT (from); | |
b7e6e612 | 1441 | immediate_quit = 0; |
04882296 KH |
1442 | return Qnil; |
1443 | } | |
195d1361 | 1444 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
b3cfe0c8 RS |
1445 | c = FETCH_CHAR (from); |
1446 | code = SYNTAX (c); | |
93da5fff | 1447 | INC_POS (from); |
b3cfe0c8 RS |
1448 | comstyle = 0; |
1449 | if (from < stop && SYNTAX_COMSTART_FIRST (c) | |
8ea151b2 RS |
1450 | && (c1 = FETCH_CHAR (from), |
1451 | SYNTAX_COMSTART_SECOND (c1))) | |
b3cfe0c8 | 1452 | { |
7fc8191e RS |
1453 | /* We have encountered a comment start sequence and we |
1454 | are ignoring all text inside comments. We must record | |
b3cfe0c8 RS |
1455 | the comment style this sequence begins so that later, |
1456 | only a comment end of the same style actually ends | |
7fc8191e | 1457 | the comment section. */ |
b3cfe0c8 | 1458 | code = Scomment; |
8ea151b2 | 1459 | comstyle = SYNTAX_COMMENT_STYLE (c1); |
93da5fff | 1460 | INC_POS (from); |
b3cfe0c8 | 1461 | } |
04882296 KH |
1462 | } |
1463 | while (code == Swhitespace || code == Sendcomment); | |
195d1361 | 1464 | if (code != Scomment && code != Scomment_fence) |
04882296 KH |
1465 | { |
1466 | immediate_quit = 0; | |
93da5fff KH |
1467 | DEC_POS (from); |
1468 | SET_PT (from); | |
04882296 KH |
1469 | return Qnil; |
1470 | } | |
1471 | /* We're at the start of a comment. */ | |
1472 | while (1) | |
1473 | { | |
1474 | if (from == stop) | |
b3cfe0c8 RS |
1475 | { |
1476 | immediate_quit = 0; | |
04882296 | 1477 | SET_PT (from); |
b3cfe0c8 RS |
1478 | return Qnil; |
1479 | } | |
195d1361 | 1480 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
04882296 | 1481 | c = FETCH_CHAR (from); |
93da5fff | 1482 | INC_POS (from); |
04882296 KH |
1483 | if (SYNTAX (c) == Sendcomment |
1484 | && SYNTAX_COMMENT_STYLE (c) == comstyle) | |
1485 | /* we have encountered a comment end of the same style | |
1486 | as the comment sequence which began this comment | |
1487 | section */ | |
1488 | break; | |
195d1361 RS |
1489 | if (SYNTAX (c) == Scomment_fence |
1490 | && comstyle == ST_COMMENT_STYLE) | |
1491 | /* we have encountered a comment end of the same style | |
1492 | as the comment sequence which began this comment | |
1493 | section. */ | |
1494 | break; | |
04882296 | 1495 | if (from < stop && SYNTAX_COMEND_FIRST (c) |
8ea151b2 RS |
1496 | && (c1 = FETCH_CHAR (from), |
1497 | SYNTAX_COMEND_SECOND (c1)) | |
04882296 KH |
1498 | && SYNTAX_COMMENT_STYLE (c) == comstyle) |
1499 | /* we have encountered a comment end of the same style | |
1500 | as the comment sequence which began this comment | |
1501 | section */ | |
93da5fff | 1502 | { INC_POS (from); break; } |
b3cfe0c8 | 1503 | } |
04882296 | 1504 | /* We have skipped one comment. */ |
840f481c | 1505 | count1--; |
b3cfe0c8 RS |
1506 | } |
1507 | ||
840f481c | 1508 | while (count1 < 0) |
b3cfe0c8 | 1509 | { |
b3cfe0c8 RS |
1510 | while (from > stop) |
1511 | { | |
1512 | int quoted; | |
1513 | ||
93da5fff | 1514 | DEC_POS (from); |
b3cfe0c8 RS |
1515 | quoted = char_quoted (from); |
1516 | if (quoted) | |
195d1361 RS |
1517 | { |
1518 | DEC_POS (from); | |
1519 | goto leave; /* ????? XXXXX */ | |
1520 | } | |
1521 | UPDATE_SYNTAX_TABLE_BACKWARD (from); | |
b3cfe0c8 RS |
1522 | c = FETCH_CHAR (from); |
1523 | code = SYNTAX (c); | |
1524 | comstyle = 0; | |
7fc8191e RS |
1525 | if (code == Sendcomment) |
1526 | comstyle = SYNTAX_COMMENT_STYLE (c); | |
93da5fff KH |
1527 | temp_pos = from; |
1528 | DEC_POS (temp_pos); | |
b3cfe0c8 | 1529 | if (from > stop && SYNTAX_COMEND_SECOND (c) |
93da5fff | 1530 | && (c1 = FETCH_CHAR (temp_pos), |
8ea151b2 | 1531 | SYNTAX_COMEND_FIRST (c1)) |
93da5fff | 1532 | && !char_quoted (temp_pos)) |
b3cfe0c8 | 1533 | { |
7fc8191e | 1534 | /* We must record the comment style encountered so that |
b3cfe0c8 | 1535 | later, we can match only the proper comment begin |
7fc8191e | 1536 | sequence of the same style. */ |
b3cfe0c8 | 1537 | code = Sendcomment; |
8ea151b2 | 1538 | comstyle = SYNTAX_COMMENT_STYLE (c1); |
93da5fff | 1539 | from = temp_pos; |
b3cfe0c8 | 1540 | } |
ae03af34 RS |
1541 | if (from > stop && SYNTAX_COMSTART_SECOND (c) |
1542 | && (c1 = FETCH_CHAR (temp_pos), | |
1543 | SYNTAX_COMSTART_FIRST (c1)) | |
1544 | && !char_quoted (temp_pos)) | |
1545 | { | |
1546 | /* We must record the comment style encountered so that | |
1547 | later, we can match only the proper comment begin | |
1548 | sequence of the same style. */ | |
1549 | code = Scomment; | |
1550 | from = temp_pos; | |
1551 | } | |
b3cfe0c8 | 1552 | |
195d1361 RS |
1553 | if (code == Scomment_fence) |
1554 | { | |
1555 | /* Skip until first preceding unquoted comment_fence. */ | |
1556 | int found = 0, ini = from; | |
1557 | ||
1558 | while (--from != stop) | |
1559 | { | |
1560 | UPDATE_SYNTAX_TABLE_BACKWARD (from); | |
1561 | c = FETCH_CHAR (from); | |
1562 | if (SYNTAX (c) == Scomment_fence && !char_quoted (from)) | |
1563 | { | |
1564 | found = 1; | |
1565 | break; | |
1566 | } | |
1567 | } | |
1568 | if (found == 0) | |
1569 | { | |
1570 | from = ini; /* Set point to ini + 1. */ | |
1571 | goto leave; | |
1572 | } | |
1573 | } | |
1574 | else if (code == Sendcomment) | |
b3cfe0c8 | 1575 | { |
8f9dc2ed | 1576 | #if 0 |
b3cfe0c8 RS |
1577 | if (code != SYNTAX (c)) |
1578 | /* For a two-char comment ender, we can assume | |
1579 | it does end a comment. So scan back in a simple way. */ | |
1580 | { | |
93da5fff | 1581 | if (from != stop) DEC_POS (from); |
b3cfe0c8 RS |
1582 | while (1) |
1583 | { | |
8ea151b2 RS |
1584 | if ((c = FETCH_CHAR (from), |
1585 | SYNTAX (c) == Scomment) | |
b3cfe0c8 RS |
1586 | && SYNTAX_COMMENT_STYLE (c) == comstyle) |
1587 | break; | |
1588 | if (from == stop) | |
1589 | { | |
1590 | immediate_quit = 0; | |
c81a3712 | 1591 | SET_PT (from); |
b3cfe0c8 RS |
1592 | return Qnil; |
1593 | } | |
93da5fff | 1594 | DEC_POS (from); |
b3cfe0c8 | 1595 | if (SYNTAX_COMSTART_SECOND (c) |
8ea151b2 RS |
1596 | && (c1 = FETCH_CHAR (from), |
1597 | SYNTAX_COMSTART_FIRST (c1)) | |
b3cfe0c8 RS |
1598 | && SYNTAX_COMMENT_STYLE (c) == comstyle |
1599 | && !char_quoted (from)) | |
1600 | break; | |
1601 | } | |
1602 | break; | |
1603 | } | |
8f9dc2ed | 1604 | #endif /* 0 */ |
ea315ed6 | 1605 | found = back_comment (from, stop, comstyle); |
195d1361 RS |
1606 | if (found != -1) from = found; |
1607 | #if 0 | |
b3cfe0c8 RS |
1608 | /* Look back, counting the parity of string-quotes, |
1609 | and recording the comment-starters seen. | |
1610 | When we reach a safe place, assume that's not in a string; | |
1611 | then step the main scan to the earliest comment-starter seen | |
1612 | an even number of string quotes away from the safe place. | |
1613 | ||
1614 | OFROM[I] is position of the earliest comment-starter seen | |
1615 | which is I+2X quotes from the comment-end. | |
1616 | PARITY is current parity of quotes from the comment end. */ | |
1617 | { | |
1618 | int parity = 0; | |
1619 | char my_stringend = 0; | |
1620 | int string_lossage = 0; | |
1621 | int comment_end = from; | |
1622 | int comstart_pos = 0; | |
1623 | int comstart_parity = 0; | |
93da5fff | 1624 | int scanstart = from; |
b3cfe0c8 | 1625 | |
93da5fff | 1626 | DEC_POS (scanstart); |
b3cfe0c8 RS |
1627 | /* At beginning of range to scan, we're outside of strings; |
1628 | that determines quote parity to the comment-end. */ | |
1629 | while (from != stop) | |
1630 | { | |
1631 | /* Move back and examine a character. */ | |
93da5fff | 1632 | DEC_POS (from); |
b3cfe0c8 | 1633 | |
195d1361 | 1634 | UPDATE_SYNTAX_TABLE_BACKWARD (from); |
b3cfe0c8 RS |
1635 | c = FETCH_CHAR (from); |
1636 | code = SYNTAX (c); | |
1637 | ||
1638 | /* If this char is the second of a 2-char comment sequence, | |
1639 | back up and give the pair the appropriate syntax. */ | |
93da5fff KH |
1640 | temp_pos = from; |
1641 | DEC_POS (temp_pos); | |
b3cfe0c8 | 1642 | if (from > stop && SYNTAX_COMEND_SECOND (c) |
93da5fff KH |
1643 | && (c1 = FETCH_CHAR (temp_pos), |
1644 | SYNTAX_COMEND_FIRST (c1))) | |
b3cfe0c8 RS |
1645 | { |
1646 | code = Sendcomment; | |
93da5fff KH |
1647 | from = temp_pos; |
1648 | c = c1; | |
b3cfe0c8 RS |
1649 | } |
1650 | ||
93da5fff KH |
1651 | temp_pos = from; |
1652 | INC_POS (temp_pos); | |
4841063f RS |
1653 | /* If this char starts a 2-char comment start sequence, |
1654 | treat it like a 1-char comment starter. */ | |
1655 | if (from < scanstart && SYNTAX_COMSTART_FIRST (c) | |
93da5fff KH |
1656 | && (c1 = FETCH_CHAR (temp_pos), |
1657 | SYNTAX_COMSTART_SECOND (c1)) | |
1658 | && comstyle == SYNTAX_COMMENT_STYLE (c1)) | |
4841063f | 1659 | code = Scomment; |
b3cfe0c8 RS |
1660 | |
1661 | /* Ignore escaped characters. */ | |
1662 | if (char_quoted (from)) | |
1663 | continue; | |
1664 | ||
1665 | /* Track parity of quotes. */ | |
1666 | if (code == Sstring) | |
1667 | { | |
1668 | parity ^= 1; | |
1669 | if (my_stringend == 0) | |
1670 | my_stringend = c; | |
1671 | /* If we have two kinds of string delimiters. | |
1672 | There's no way to grok this scanning backwards. */ | |
1673 | else if (my_stringend != c) | |
1674 | string_lossage = 1; | |
1675 | } | |
1676 | ||
1677 | /* Record comment-starters according to that | |
1678 | quote-parity to the comment-end. */ | |
1679 | if (code == Scomment) | |
1680 | { | |
1681 | comstart_parity = parity; | |
1682 | comstart_pos = from; | |
1683 | } | |
1684 | ||
1685 | /* If we find another earlier comment-ender, | |
eb8c3be9 | 1686 | any comment-starts earlier than that don't count |
b3cfe0c8 RS |
1687 | (because they go with the earlier comment-ender). */ |
1688 | if (code == Sendcomment | |
1689 | && SYNTAX_COMMENT_STYLE (FETCH_CHAR (from)) == comstyle) | |
1690 | break; | |
1691 | ||
1692 | /* Assume a defun-start point is outside of strings. */ | |
1693 | if (code == Sopen | |
93da5fff | 1694 | && (from == stop || FETCH_BYTE (from - 1) == '\n')) |
b3cfe0c8 RS |
1695 | break; |
1696 | } | |
1697 | ||
1698 | if (comstart_pos == 0) | |
1699 | from = comment_end; | |
1700 | /* If the earliest comment starter | |
1701 | is followed by uniform paired string quotes or none, | |
1702 | we know it can't be inside a string | |
1703 | since if it were then the comment ender would be inside one. | |
1704 | So it does start a comment. Skip back to it. */ | |
1705 | else if (comstart_parity == 0 && !string_lossage) | |
1706 | from = comstart_pos; | |
1707 | else | |
1708 | { | |
1709 | /* We had two kinds of string delimiters mixed up | |
1710 | together. Decode this going forwards. | |
1711 | Scan fwd from the previous comment ender | |
1712 | to the one in question; this records where we | |
1713 | last passed a comment starter. */ | |
1714 | struct lisp_parse_state state; | |
1715 | scan_sexps_forward (&state, find_defun_start (comment_end), | |
340f92b5 | 1716 | comment_end - 1, -10000, 0, Qnil, 0); |
b3cfe0c8 | 1717 | if (state.incomment) |
195d1361 | 1718 | from = state.comstr_start; |
b3cfe0c8 RS |
1719 | else |
1720 | /* We can't grok this as a comment; scan it normally. */ | |
1721 | from = comment_end; | |
1722 | } | |
1723 | } | |
195d1361 | 1724 | #endif /* 0 */ |
7fc8191e RS |
1725 | /* We have skipped one comment. */ |
1726 | break; | |
b3cfe0c8 | 1727 | } |
195d1361 | 1728 | else if (code != Swhitespace && code != Scomment) |
b3cfe0c8 | 1729 | { |
195d1361 | 1730 | leave: |
b3cfe0c8 | 1731 | immediate_quit = 0; |
93da5fff KH |
1732 | INC_POS (from); |
1733 | SET_PT (from); | |
b3cfe0c8 RS |
1734 | return Qnil; |
1735 | } | |
1736 | } | |
1737 | ||
840f481c | 1738 | count1++; |
b3cfe0c8 RS |
1739 | } |
1740 | ||
1741 | SET_PT (from); | |
1742 | immediate_quit = 0; | |
1743 | return Qt; | |
1744 | } | |
1745 | \f | |
8489eb67 RS |
1746 | Lisp_Object |
1747 | scan_lists (from, count, depth, sexpflag) | |
1748 | register int from; | |
1749 | int count, depth, sexpflag; | |
1750 | { | |
1751 | Lisp_Object val; | |
195d1361 | 1752 | register int stop = count > 0 ? ZV : BEGV; |
93da5fff KH |
1753 | register int c, c1; |
1754 | int stringterm; | |
8489eb67 RS |
1755 | int quoted; |
1756 | int mathexit = 0; | |
93da5fff | 1757 | register enum syntaxcode code, temp_code; |
195d1361 | 1758 | int min_depth = depth; /* Err out if depth gets less than this. */ |
e5d4f4dc | 1759 | int comstyle = 0; /* style of comment encountered */ |
93da5fff | 1760 | int temp_pos; |
7bf5e9e4 | 1761 | int last_good = from; |
195d1361 | 1762 | int found; |
8489eb67 RS |
1763 | |
1764 | if (depth > 0) min_depth = 0; | |
1765 | ||
1766 | immediate_quit = 1; | |
1767 | QUIT; | |
1768 | ||
195d1361 | 1769 | SETUP_SYNTAX_TABLE (from, count); |
8489eb67 RS |
1770 | while (count > 0) |
1771 | { | |
8489eb67 RS |
1772 | while (from < stop) |
1773 | { | |
195d1361 | 1774 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
8489eb67 | 1775 | c = FETCH_CHAR (from); |
e5d4f4dc | 1776 | code = SYNTAX (c); |
7bf5e9e4 RS |
1777 | if (depth == min_depth) |
1778 | last_good = from; | |
93da5fff | 1779 | INC_POS (from); |
195d1361 | 1780 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
8489eb67 RS |
1781 | if (from < stop && SYNTAX_COMSTART_FIRST (c) |
1782 | && SYNTAX_COMSTART_SECOND (FETCH_CHAR (from)) | |
1783 | && parse_sexp_ignore_comments) | |
e5d4f4dc RS |
1784 | { |
1785 | /* we have encountered a comment start sequence and we | |
195d1361 | 1786 | are ignoring all text inside comments. We must record |
e5d4f4dc RS |
1787 | the comment style this sequence begins so that later, |
1788 | only a comment end of the same style actually ends | |
1789 | the comment section */ | |
1790 | code = Scomment; | |
1791 | comstyle = SYNTAX_COMMENT_STYLE (FETCH_CHAR (from)); | |
93da5fff | 1792 | INC_POS (from); |
e5d4f4dc RS |
1793 | } |
1794 | ||
195d1361 | 1795 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
8489eb67 RS |
1796 | if (SYNTAX_PREFIX (c)) |
1797 | continue; | |
1798 | ||
0220c518 | 1799 | switch (SWITCH_ENUM_CAST (code)) |
8489eb67 RS |
1800 | { |
1801 | case Sescape: | |
1802 | case Scharquote: | |
1803 | if (from == stop) goto lose; | |
93da5fff | 1804 | INC_POS (from); |
8489eb67 RS |
1805 | /* treat following character as a word constituent */ |
1806 | case Sword: | |
1807 | case Ssymbol: | |
1808 | if (depth || !sexpflag) break; | |
195d1361 | 1809 | /* This word counts as a sexp; return at end of it. */ |
8489eb67 RS |
1810 | while (from < stop) |
1811 | { | |
195d1361 | 1812 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
0220c518 | 1813 | switch (SWITCH_ENUM_CAST (SYNTAX (FETCH_CHAR (from)))) |
8489eb67 RS |
1814 | { |
1815 | case Scharquote: | |
1816 | case Sescape: | |
93da5fff | 1817 | INC_POS (from); |
8489eb67 RS |
1818 | if (from == stop) goto lose; |
1819 | break; | |
1820 | case Sword: | |
1821 | case Ssymbol: | |
1822 | case Squote: | |
1823 | break; | |
1824 | default: | |
1825 | goto done; | |
1826 | } | |
93da5fff | 1827 | INC_POS (from); |
8489eb67 RS |
1828 | } |
1829 | goto done; | |
1830 | ||
1831 | case Scomment: | |
195d1361 | 1832 | case Scomment_fence: |
8489eb67 RS |
1833 | if (!parse_sexp_ignore_comments) break; |
1834 | while (1) | |
1835 | { | |
c01f7ec0 RS |
1836 | if (from == stop) |
1837 | { | |
1838 | if (depth == 0) | |
1839 | goto done; | |
1840 | goto lose; | |
1841 | } | |
195d1361 | 1842 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
e5d4f4dc | 1843 | c = FETCH_CHAR (from); |
195d1361 RS |
1844 | if (code == Scomment |
1845 | ? (SYNTAX (c) == Sendcomment | |
1846 | && SYNTAX_COMMENT_STYLE (c) == comstyle) | |
1847 | : (SYNTAX (c) == Scomment_fence)) | |
e5d4f4dc RS |
1848 | /* we have encountered a comment end of the same style |
1849 | as the comment sequence which began this comment | |
1850 | section */ | |
8489eb67 | 1851 | break; |
93da5fff | 1852 | INC_POS (from); |
8489eb67 | 1853 | if (from < stop && SYNTAX_COMEND_FIRST (c) |
e5d4f4dc | 1854 | && SYNTAX_COMEND_SECOND (FETCH_CHAR (from)) |
195d1361 RS |
1855 | && SYNTAX_COMMENT_STYLE (c) == comstyle |
1856 | && code == Scomment) | |
e5d4f4dc RS |
1857 | /* we have encountered a comment end of the same style |
1858 | as the comment sequence which began this comment | |
1859 | section */ | |
93da5fff | 1860 | { INC_POS (from); break; } |
8489eb67 RS |
1861 | } |
1862 | break; | |
1863 | ||
1864 | case Smath: | |
1865 | if (!sexpflag) | |
1866 | break; | |
1867 | if (from != stop && c == FETCH_CHAR (from)) | |
93da5fff | 1868 | INC_POS (from); |
8489eb67 RS |
1869 | if (mathexit) |
1870 | { | |
1871 | mathexit = 0; | |
1872 | goto close1; | |
1873 | } | |
1874 | mathexit = 1; | |
1875 | ||
1876 | case Sopen: | |
1877 | if (!++depth) goto done; | |
1878 | break; | |
1879 | ||
1880 | case Sclose: | |
1881 | close1: | |
1882 | if (!--depth) goto done; | |
1883 | if (depth < min_depth) | |
7bf5e9e4 RS |
1884 | Fsignal (Qscan_error, |
1885 | Fcons (build_string ("Containing expression ends prematurely"), | |
1886 | Fcons (make_number (last_good), | |
1887 | Fcons (make_number (from), Qnil)))); | |
8489eb67 RS |
1888 | break; |
1889 | ||
1890 | case Sstring: | |
195d1361 | 1891 | case Sstring_fence: |
93da5fff KH |
1892 | temp_pos = from; |
1893 | DEC_POS (temp_pos); | |
1894 | stringterm = FETCH_CHAR (temp_pos); | |
8489eb67 RS |
1895 | while (1) |
1896 | { | |
1897 | if (from >= stop) goto lose; | |
195d1361 RS |
1898 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
1899 | if (code == Sstring | |
1900 | ? (FETCH_CHAR (from) == stringterm) | |
1901 | : SYNTAX (FETCH_CHAR (from)) == Sstring_fence) | |
1902 | break; | |
0220c518 | 1903 | switch (SWITCH_ENUM_CAST (SYNTAX (FETCH_CHAR (from)))) |
8489eb67 RS |
1904 | { |
1905 | case Scharquote: | |
1906 | case Sescape: | |
93da5fff | 1907 | INC_POS (from); |
8489eb67 | 1908 | } |
93da5fff | 1909 | INC_POS (from); |
8489eb67 | 1910 | } |
93da5fff | 1911 | INC_POS (from); |
8489eb67 RS |
1912 | if (!depth && sexpflag) goto done; |
1913 | break; | |
1914 | } | |
1915 | } | |
1916 | ||
1917 | /* Reached end of buffer. Error if within object, return nil if between */ | |
1918 | if (depth) goto lose; | |
1919 | ||
1920 | immediate_quit = 0; | |
1921 | return Qnil; | |
1922 | ||
1923 | /* End of object reached */ | |
1924 | done: | |
1925 | count--; | |
1926 | } | |
1927 | ||
1928 | while (count < 0) | |
1929 | { | |
8489eb67 RS |
1930 | while (from > stop) |
1931 | { | |
93da5fff | 1932 | DEC_POS (from); |
195d1361 | 1933 | UPDATE_SYNTAX_TABLE_BACKWARD (from); |
8489eb67 | 1934 | if (quoted = char_quoted (from)) |
195d1361 RS |
1935 | { |
1936 | DEC_POS (from); | |
1937 | UPDATE_SYNTAX_TABLE_BACKWARD (from); | |
1938 | } | |
8489eb67 RS |
1939 | c = FETCH_CHAR (from); |
1940 | code = SYNTAX (c); | |
7bf5e9e4 RS |
1941 | if (depth == min_depth) |
1942 | last_good = from; | |
7fc8191e RS |
1943 | comstyle = 0; |
1944 | if (code == Sendcomment) | |
1945 | comstyle = SYNTAX_COMMENT_STYLE (c); | |
93da5fff KH |
1946 | temp_pos = from; |
1947 | DEC_POS (temp_pos); | |
8489eb67 | 1948 | if (from > stop && SYNTAX_COMEND_SECOND (c) |
93da5fff KH |
1949 | && (c1 = FETCH_CHAR (temp_pos), SYNTAX_COMEND_FIRST (c1)) |
1950 | && !char_quoted (temp_pos) | |
8489eb67 | 1951 | && parse_sexp_ignore_comments) |
e5d4f4dc RS |
1952 | { |
1953 | /* we must record the comment style encountered so that | |
1954 | later, we can match only the proper comment begin | |
1955 | sequence of the same style */ | |
1956 | code = Sendcomment; | |
93da5fff KH |
1957 | comstyle = SYNTAX_COMMENT_STYLE (c1); |
1958 | from = temp_pos; | |
e5d4f4dc RS |
1959 | } |
1960 | ||
8489eb67 RS |
1961 | if (SYNTAX_PREFIX (c)) |
1962 | continue; | |
1963 | ||
0220c518 | 1964 | switch (SWITCH_ENUM_CAST (quoted ? Sword : code)) |
8489eb67 RS |
1965 | { |
1966 | case Sword: | |
1967 | case Ssymbol: | |
1968 | if (depth || !sexpflag) break; | |
195d1361 RS |
1969 | /* This word counts as a sexp; count object finished |
1970 | after passing it. */ | |
8489eb67 RS |
1971 | while (from > stop) |
1972 | { | |
93da5fff KH |
1973 | temp_pos = from; |
1974 | DEC_POS (temp_pos); | |
195d1361 | 1975 | UPDATE_SYNTAX_TABLE_BACKWARD (temp_pos); |
93da5fff | 1976 | quoted = char_quoted (temp_pos); |
8489eb67 | 1977 | if (quoted) |
93da5fff KH |
1978 | { |
1979 | from = temp_pos; | |
1980 | DEC_POS (temp_pos); | |
195d1361 | 1981 | UPDATE_SYNTAX_TABLE_BACKWARD (temp_pos); |
93da5fff KH |
1982 | } |
1983 | c1 = FETCH_CHAR (temp_pos); | |
1984 | temp_code = SYNTAX (c1); | |
1985 | if (! (quoted || temp_code == Sword | |
1986 | || temp_code == Ssymbol | |
1987 | || temp_code == Squote)) | |
8489eb67 | 1988 | goto done2; |
93da5fff | 1989 | from = temp_pos; |
8489eb67 RS |
1990 | } |
1991 | goto done2; | |
1992 | ||
1993 | case Smath: | |
1994 | if (!sexpflag) | |
1995 | break; | |
93da5fff KH |
1996 | temp_pos = from; |
1997 | DEC_POS (temp_pos); | |
195d1361 | 1998 | UPDATE_SYNTAX_TABLE_BACKWARD (temp_pos); |
93da5fff KH |
1999 | if (from != stop && c == FETCH_CHAR (temp_pos)) |
2000 | from = temp_pos; | |
8489eb67 RS |
2001 | if (mathexit) |
2002 | { | |
2003 | mathexit = 0; | |
2004 | goto open2; | |
2005 | } | |
2006 | mathexit = 1; | |
2007 | ||
2008 | case Sclose: | |
2009 | if (!++depth) goto done2; | |
2010 | break; | |
2011 | ||
2012 | case Sopen: | |
2013 | open2: | |
2014 | if (!--depth) goto done2; | |
2015 | if (depth < min_depth) | |
7bf5e9e4 RS |
2016 | Fsignal (Qscan_error, |
2017 | Fcons (build_string ("Containing expression ends prematurely"), | |
2018 | Fcons (make_number (last_good), | |
2019 | Fcons (make_number (from), Qnil)))); | |
8489eb67 RS |
2020 | break; |
2021 | ||
2022 | case Sendcomment: | |
2023 | if (!parse_sexp_ignore_comments) | |
2024 | break; | |
8f9dc2ed | 2025 | #if 0 |
37bef230 RS |
2026 | if (code != SYNTAX (c)) |
2027 | /* For a two-char comment ender, we can assume | |
2028 | it does end a comment. So scan back in a simple way. */ | |
2029 | { | |
93da5fff | 2030 | if (from != stop) DEC_POS (from); |
37bef230 RS |
2031 | while (1) |
2032 | { | |
2033 | if (SYNTAX (c = FETCH_CHAR (from)) == Scomment | |
2034 | && SYNTAX_COMMENT_STYLE (c) == comstyle) | |
2035 | break; | |
c01f7ec0 RS |
2036 | if (from == stop) |
2037 | { | |
2038 | if (depth == 0) | |
2039 | goto done2; | |
2040 | goto lose; | |
2041 | } | |
93da5fff | 2042 | DEC_POS (from); |
37bef230 RS |
2043 | if (SYNTAX_COMSTART_SECOND (c) |
2044 | && SYNTAX_COMSTART_FIRST (FETCH_CHAR (from)) | |
2045 | && SYNTAX_COMMENT_STYLE (c) == comstyle | |
2046 | && !char_quoted (from)) | |
2047 | break; | |
2048 | } | |
2049 | break; | |
2050 | } | |
8f9dc2ed | 2051 | #endif /* 0 */ |
ea315ed6 | 2052 | found = back_comment (from, stop, comstyle); |
195d1361 RS |
2053 | if (found != -1) from = found; |
2054 | #if 0 | |
8489eb67 RS |
2055 | /* Look back, counting the parity of string-quotes, |
2056 | and recording the comment-starters seen. | |
2057 | When we reach a safe place, assume that's not in a string; | |
2058 | then step the main scan to the earliest comment-starter seen | |
2059 | an even number of string quotes away from the safe place. | |
2060 | ||
2061 | OFROM[I] is position of the earliest comment-starter seen | |
2062 | which is I+2X quotes from the comment-end. | |
2063 | PARITY is current parity of quotes from the comment end. */ | |
2064 | { | |
8489eb67 | 2065 | int parity = 0; |
e5d4f4dc RS |
2066 | char my_stringend = 0; |
2067 | int string_lossage = 0; | |
2068 | int comment_end = from; | |
37bef230 RS |
2069 | int comstart_pos = 0; |
2070 | int comstart_parity = 0; | |
93da5fff KH |
2071 | int scanstart = from; |
2072 | ||
2073 | DEC_POS (scanstart); | |
8489eb67 RS |
2074 | |
2075 | /* At beginning of range to scan, we're outside of strings; | |
2076 | that determines quote parity to the comment-end. */ | |
2077 | while (from != stop) | |
2078 | { | |
2079 | /* Move back and examine a character. */ | |
93da5fff | 2080 | DEC_POS (from); |
8489eb67 RS |
2081 | |
2082 | c = FETCH_CHAR (from); | |
2083 | code = SYNTAX (c); | |
2084 | ||
2085 | /* If this char is the second of a 2-char comment sequence, | |
2086 | back up and give the pair the appropriate syntax. */ | |
93da5fff KH |
2087 | temp_pos = from; |
2088 | DEC_POS (temp_pos); | |
8489eb67 | 2089 | if (from > stop && SYNTAX_COMEND_SECOND (c) |
93da5fff KH |
2090 | && (c1 = FETCH_CHAR (temp_pos), |
2091 | SYNTAX_COMEND_FIRST (c1))) | |
e5d4f4dc RS |
2092 | { |
2093 | code = Sendcomment; | |
93da5fff KH |
2094 | from = temp_pos; |
2095 | c = c1; | |
e5d4f4dc RS |
2096 | } |
2097 | ||
4841063f RS |
2098 | /* If this char starts a 2-char comment start sequence, |
2099 | treat it like a 1-char comment starter. */ | |
93da5fff KH |
2100 | temp_pos = from; |
2101 | INC_POS (temp_pos); | |
4841063f | 2102 | if (from < scanstart && SYNTAX_COMSTART_FIRST (c) |
93da5fff KH |
2103 | && (c1 = FETCH_CHAR (temp_pos), |
2104 | SYNTAX_COMSTART_SECOND (c1)) | |
2105 | && comstyle == SYNTAX_COMMENT_STYLE (c1)) | |
4841063f | 2106 | code = Scomment; |
8489eb67 RS |
2107 | |
2108 | /* Ignore escaped characters. */ | |
2109 | if (char_quoted (from)) | |
2110 | continue; | |
2111 | ||
37bef230 | 2112 | /* Track parity of quotes. */ |
8489eb67 | 2113 | if (code == Sstring) |
e5d4f4dc RS |
2114 | { |
2115 | parity ^= 1; | |
2116 | if (my_stringend == 0) | |
2117 | my_stringend = c; | |
37bef230 | 2118 | /* If we have two kinds of string delimiters. |
e5d4f4dc RS |
2119 | There's no way to grok this scanning backwards. */ |
2120 | else if (my_stringend != c) | |
2121 | string_lossage = 1; | |
2122 | } | |
8489eb67 RS |
2123 | |
2124 | /* Record comment-starters according to that | |
2125 | quote-parity to the comment-end. */ | |
2126 | if (code == Scomment) | |
37bef230 RS |
2127 | { |
2128 | comstart_parity = parity; | |
2129 | comstart_pos = from; | |
2130 | } | |
8489eb67 | 2131 | |
37bef230 | 2132 | /* If we find another earlier comment-ender, |
eb8c3be9 | 2133 | any comment-starts earlier than that don't count |
37bef230 | 2134 | (because they go with the earlier comment-ender). */ |
e5d4f4dc RS |
2135 | if (code == Sendcomment |
2136 | && SYNTAX_COMMENT_STYLE (FETCH_CHAR (from)) == comstyle) | |
8489eb67 | 2137 | break; |
37bef230 RS |
2138 | |
2139 | /* Assume a defun-start point is outside of strings. */ | |
2140 | if (code == Sopen | |
93da5fff | 2141 | && (from == stop || FETCH_BYTE (from - 1) == '\n')) |
37bef230 | 2142 | break; |
8489eb67 | 2143 | } |
37bef230 RS |
2144 | |
2145 | if (comstart_pos == 0) | |
2146 | from = comment_end; | |
2147 | /* If the earliest comment starter | |
2148 | is followed by uniform paired string quotes or none, | |
2149 | we know it can't be inside a string | |
2150 | since if it were then the comment ender would be inside one. | |
2151 | So it does start a comment. Skip back to it. */ | |
2152 | else if (comstart_parity == 0 && !string_lossage) | |
2153 | from = comstart_pos; | |
2154 | else | |
e5d4f4dc RS |
2155 | { |
2156 | /* We had two kinds of string delimiters mixed up | |
2157 | together. Decode this going forwards. | |
2158 | Scan fwd from the previous comment ender | |
2159 | to the one in question; this records where we | |
2160 | last passed a comment starter. */ | |
2161 | struct lisp_parse_state state; | |
37bef230 | 2162 | scan_sexps_forward (&state, find_defun_start (comment_end), |
340f92b5 | 2163 | comment_end - 1, -10000, 0, Qnil, 0); |
e5d4f4dc | 2164 | if (state.incomment) |
195d1361 | 2165 | from = state.comstr_start; |
e5d4f4dc RS |
2166 | else |
2167 | /* We can't grok this as a comment; scan it normally. */ | |
2168 | from = comment_end; | |
2169 | } | |
8489eb67 | 2170 | } |
195d1361 | 2171 | #endif /* 0 */ |
8489eb67 RS |
2172 | break; |
2173 | ||
195d1361 RS |
2174 | case Scomment_fence: |
2175 | case Sstring_fence: | |
2176 | while (1) | |
2177 | { | |
2178 | DEC_POS (from); | |
2179 | if (from == stop) goto lose; | |
2180 | UPDATE_SYNTAX_TABLE_BACKWARD (from); | |
2181 | if (!char_quoted (from) | |
2182 | && SYNTAX (FETCH_CHAR (from)) == code) | |
2183 | break; | |
2184 | } | |
2185 | if (code == Sstring_fence && !depth && sexpflag) goto done2; | |
2186 | break; | |
2187 | ||
8489eb67 RS |
2188 | case Sstring: |
2189 | stringterm = FETCH_CHAR (from); | |
2190 | while (1) | |
2191 | { | |
2192 | if (from == stop) goto lose; | |
93da5fff KH |
2193 | temp_pos = from; |
2194 | DEC_POS (temp_pos); | |
195d1361 | 2195 | UPDATE_SYNTAX_TABLE_BACKWARD (temp_pos); |
93da5fff KH |
2196 | if (!char_quoted (temp_pos) |
2197 | && stringterm == FETCH_CHAR (temp_pos)) | |
8489eb67 | 2198 | break; |
93da5fff | 2199 | from = temp_pos; |
8489eb67 | 2200 | } |
93da5fff | 2201 | DEC_POS (from); |
8489eb67 RS |
2202 | if (!depth && sexpflag) goto done2; |
2203 | break; | |
2204 | } | |
2205 | } | |
2206 | ||
2207 | /* Reached start of buffer. Error if within object, return nil if between */ | |
2208 | if (depth) goto lose; | |
2209 | ||
2210 | immediate_quit = 0; | |
2211 | return Qnil; | |
2212 | ||
2213 | done2: | |
2214 | count++; | |
2215 | } | |
2216 | ||
2217 | ||
2218 | immediate_quit = 0; | |
1e142fb7 | 2219 | XSETFASTINT (val, from); |
8489eb67 RS |
2220 | return val; |
2221 | ||
2222 | lose: | |
7bf5e9e4 RS |
2223 | Fsignal (Qscan_error, |
2224 | Fcons (build_string ("Unbalanced parentheses"), | |
2225 | Fcons (make_number (last_good), | |
2226 | Fcons (make_number (from), Qnil)))); | |
2227 | ||
8489eb67 RS |
2228 | /* NOTREACHED */ |
2229 | } | |
2230 | ||
8489eb67 RS |
2231 | DEFUN ("scan-lists", Fscan_lists, Sscan_lists, 3, 3, 0, |
2232 | "Scan from character number FROM by COUNT lists.\n\ | |
2233 | Returns the character number of the position thus found.\n\ | |
2234 | \n\ | |
2235 | If DEPTH is nonzero, paren depth begins counting from that value,\n\ | |
2236 | only places where the depth in parentheses becomes zero\n\ | |
2237 | are candidates for stopping; COUNT such places are counted.\n\ | |
2238 | Thus, a positive value for DEPTH means go out levels.\n\ | |
2239 | \n\ | |
2240 | Comments are ignored if `parse-sexp-ignore-comments' is non-nil.\n\ | |
2241 | \n\ | |
2242 | If the beginning or end of (the accessible part of) the buffer is reached\n\ | |
2243 | and the depth is wrong, an error is signaled.\n\ | |
2244 | If the depth is right but the count is not used up, nil is returned.") | |
2245 | (from, count, depth) | |
2246 | Lisp_Object from, count, depth; | |
2247 | { | |
2248 | CHECK_NUMBER (from, 0); | |
2249 | CHECK_NUMBER (count, 1); | |
2250 | CHECK_NUMBER (depth, 2); | |
2251 | ||
2252 | return scan_lists (XINT (from), XINT (count), XINT (depth), 0); | |
2253 | } | |
2254 | ||
2255 | DEFUN ("scan-sexps", Fscan_sexps, Sscan_sexps, 2, 2, 0, | |
2256 | "Scan from character number FROM by COUNT balanced expressions.\n\ | |
2257 | If COUNT is negative, scan backwards.\n\ | |
2258 | Returns the character number of the position thus found.\n\ | |
2259 | \n\ | |
2260 | Comments are ignored if `parse-sexp-ignore-comments' is non-nil.\n\ | |
2261 | \n\ | |
2262 | If the beginning or end of (the accessible part of) the buffer is reached\n\ | |
2263 | in the middle of a parenthetical grouping, an error is signaled.\n\ | |
2264 | If the beginning or end is reached between groupings\n\ | |
2265 | but before count is used up, nil is returned.") | |
2266 | (from, count) | |
2267 | Lisp_Object from, count; | |
2268 | { | |
2269 | CHECK_NUMBER (from, 0); | |
2270 | CHECK_NUMBER (count, 1); | |
2271 | ||
2272 | return scan_lists (XINT (from), XINT (count), 0, 1); | |
2273 | } | |
2274 | ||
2275 | DEFUN ("backward-prefix-chars", Fbackward_prefix_chars, Sbackward_prefix_chars, | |
2276 | 0, 0, 0, | |
2277 | "Move point backward over any number of chars with prefix syntax.\n\ | |
2278 | This includes chars with \"quote\" or \"prefix\" syntax (' or p).") | |
2279 | () | |
2280 | { | |
2281 | int beg = BEGV; | |
6ec8bbd2 | 2282 | int pos = PT; |
93da5fff KH |
2283 | int c; |
2284 | int temp_pos = pos; | |
2285 | ||
195d1361 RS |
2286 | if (pos > beg) |
2287 | { | |
2288 | SETUP_SYNTAX_TABLE (pos, -1); | |
2289 | } | |
93da5fff | 2290 | DEC_POS (temp_pos); |
8489eb67 | 2291 | |
93da5fff | 2292 | while (pos > beg && !char_quoted (temp_pos) |
195d1361 | 2293 | /* Previous statement updates syntax table. */ |
93da5fff KH |
2294 | && ((c = FETCH_CHAR (temp_pos), SYNTAX (c) == Squote) |
2295 | || SYNTAX_PREFIX (c))) | |
2296 | { | |
2297 | pos = temp_pos; | |
2298 | DEC_POS (temp_pos); | |
2299 | } | |
8489eb67 RS |
2300 | |
2301 | SET_PT (pos); | |
2302 | ||
2303 | return Qnil; | |
2304 | } | |
2305 | \f | |
8489eb67 | 2306 | /* Parse forward from FROM to END, |
e5d4f4dc RS |
2307 | assuming that FROM has state OLDSTATE (nil means FROM is start of function), |
2308 | and return a description of the state of the parse at END. | |
c81a3712 RS |
2309 | If STOPBEFORE is nonzero, stop at the start of an atom. |
2310 | If COMMENTSTOP is nonzero, stop at the start of a comment. */ | |
8489eb67 | 2311 | |
340f92b5 | 2312 | static void |
c81a3712 RS |
2313 | scan_sexps_forward (stateptr, from, end, targetdepth, |
2314 | stopbefore, oldstate, commentstop) | |
e5d4f4dc | 2315 | struct lisp_parse_state *stateptr; |
8489eb67 RS |
2316 | register int from; |
2317 | int end, targetdepth, stopbefore; | |
2318 | Lisp_Object oldstate; | |
c81a3712 | 2319 | int commentstop; |
8489eb67 RS |
2320 | { |
2321 | struct lisp_parse_state state; | |
2322 | ||
2323 | register enum syntaxcode code; | |
2324 | struct level { int last, prev; }; | |
2325 | struct level levelstart[100]; | |
2326 | register struct level *curlevel = levelstart; | |
2327 | struct level *endlevel = levelstart + 100; | |
93da5fff | 2328 | int prev; |
8489eb67 RS |
2329 | register int depth; /* Paren depth of current scanning location. |
2330 | level - levelstart equals this except | |
2331 | when the depth becomes negative. */ | |
2332 | int mindepth; /* Lowest DEPTH value seen. */ | |
2333 | int start_quoted = 0; /* Nonzero means starting after a char quote */ | |
2334 | Lisp_Object tem; | |
93da5fff | 2335 | int prev_from; /* Keep one character before FROM. */ |
195d1361 RS |
2336 | int boundary_stop = commentstop == -1; |
2337 | int nofence; | |
93da5fff KH |
2338 | |
2339 | prev_from = from; | |
2340 | DEC_POS (prev_from); | |
2341 | ||
2342 | /* Use this macro instead of `from++'. */ | |
2343 | #define INC_FROM do { prev_from = from; INC_POS (from); } while (0) | |
8489eb67 RS |
2344 | |
2345 | immediate_quit = 1; | |
2346 | QUIT; | |
2347 | ||
195d1361 RS |
2348 | SETUP_SYNTAX_TABLE (from, 1); |
2349 | ||
265a9e55 | 2350 | if (NILP (oldstate)) |
8489eb67 RS |
2351 | { |
2352 | depth = 0; | |
2353 | state.instring = -1; | |
2354 | state.incomment = 0; | |
195d1361 RS |
2355 | state.comstyle = 0; /* comment style a by default. */ |
2356 | state.comstr_start = -1; /* no comment/string seen. */ | |
8489eb67 RS |
2357 | } |
2358 | else | |
2359 | { | |
2360 | tem = Fcar (oldstate); | |
265a9e55 | 2361 | if (!NILP (tem)) |
8489eb67 RS |
2362 | depth = XINT (tem); |
2363 | else | |
2364 | depth = 0; | |
2365 | ||
2366 | oldstate = Fcdr (oldstate); | |
2367 | oldstate = Fcdr (oldstate); | |
2368 | oldstate = Fcdr (oldstate); | |
2369 | tem = Fcar (oldstate); | |
195d1361 RS |
2370 | /* Check whether we are inside string_fence-style string: */ |
2371 | state.instring = ( !NILP (tem) | |
2372 | ? ( INTEGERP (tem) ? XINT (tem) : ST_STRING_STYLE) | |
2373 | : -1); | |
8489eb67 RS |
2374 | |
2375 | oldstate = Fcdr (oldstate); | |
2376 | tem = Fcar (oldstate); | |
265a9e55 | 2377 | state.incomment = !NILP (tem); |
8489eb67 RS |
2378 | |
2379 | oldstate = Fcdr (oldstate); | |
2380 | tem = Fcar (oldstate); | |
265a9e55 | 2381 | start_quoted = !NILP (tem); |
e5d4f4dc RS |
2382 | |
2383 | /* if the eight element of the list is nil, we are in comment | |
195d1361 RS |
2384 | style a. If it is non-nil, we are in comment style b */ |
2385 | oldstate = Fcdr (oldstate); | |
e5d4f4dc | 2386 | oldstate = Fcdr (oldstate); |
195d1361 RS |
2387 | tem = Fcar (oldstate); |
2388 | state.comstyle = NILP (tem) ? 0 : ( EQ (tem, Qsyntax_table) | |
2389 | ? ST_COMMENT_STYLE : 1 ); | |
2390 | ||
e5d4f4dc | 2391 | oldstate = Fcdr (oldstate); |
e5d4f4dc | 2392 | tem = Fcar (oldstate); |
195d1361 | 2393 | state.comstr_start = NILP (tem) ? -1 : XINT (tem) ; |
8489eb67 RS |
2394 | } |
2395 | state.quoted = 0; | |
2396 | mindepth = depth; | |
2397 | ||
2398 | curlevel->prev = -1; | |
2399 | curlevel->last = -1; | |
2400 | ||
195d1361 | 2401 | /* Enter the loop at a place appropriate for initial state. */ |
8489eb67 RS |
2402 | |
2403 | if (state.incomment) goto startincomment; | |
2404 | if (state.instring >= 0) | |
2405 | { | |
195d1361 | 2406 | nofence = state.instring != ST_STRING_STYLE; |
8489eb67 RS |
2407 | if (start_quoted) goto startquotedinstring; |
2408 | goto startinstring; | |
2409 | } | |
2410 | if (start_quoted) goto startquoted; | |
2411 | ||
2412 | while (from < end) | |
2413 | { | |
195d1361 | 2414 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
e5d4f4dc | 2415 | code = SYNTAX (FETCH_CHAR (from)); |
93da5fff | 2416 | INC_FROM; |
4c920633 | 2417 | |
8f9dc2ed | 2418 | if (code == Scomment) |
195d1361 | 2419 | state.comstr_start = prev_from; |
4c920633 | 2420 | else if (code == Scomment_fence) |
e5d4f4dc RS |
2421 | { |
2422 | /* Record the comment style we have entered so that only | |
2423 | the comment-end sequence of the same style actually | |
2424 | terminates the comment section. */ | |
195d1361 RS |
2425 | state.comstyle = ( code == Scomment_fence |
2426 | ? ST_COMMENT_STYLE | |
2427 | : SYNTAX_COMMENT_STYLE (FETCH_CHAR (from))); | |
2428 | state.comstr_start = prev_from; | |
2429 | if (code != Scomment_fence) INC_FROM; | |
e5d4f4dc | 2430 | code = Scomment; |
e5d4f4dc | 2431 | } |
4c920633 RS |
2432 | else if (from < end) |
2433 | if (SYNTAX_COMSTART_FIRST (FETCH_CHAR (prev_from))) | |
2434 | if (SYNTAX_COMSTART_SECOND (FETCH_CHAR (from))) | |
2435 | /* Duplicate code to avoid a very complex if-expression | |
2436 | which causes trouble for the SGI compiler. */ | |
2437 | { | |
2438 | /* Record the comment style we have entered so that only | |
2439 | the comment-end sequence of the same style actually | |
2440 | terminates the comment section. */ | |
2441 | state.comstyle = ( code == Scomment_fence | |
2442 | ? ST_COMMENT_STYLE | |
2443 | : SYNTAX_COMMENT_STYLE (FETCH_CHAR (from))); | |
2444 | state.comstr_start = prev_from; | |
2445 | if (code != Scomment_fence) INC_FROM; | |
2446 | code = Scomment; | |
2447 | } | |
e5d4f4dc | 2448 | |
93da5fff | 2449 | if (SYNTAX_PREFIX (FETCH_CHAR (prev_from))) |
8489eb67 | 2450 | continue; |
0220c518 | 2451 | switch (SWITCH_ENUM_CAST (code)) |
8489eb67 RS |
2452 | { |
2453 | case Sescape: | |
2454 | case Scharquote: | |
2455 | if (stopbefore) goto stop; /* this arg means stop at sexp start */ | |
93da5fff | 2456 | curlevel->last = prev_from; |
8489eb67 RS |
2457 | startquoted: |
2458 | if (from == end) goto endquoted; | |
93da5fff | 2459 | INC_FROM; |
8489eb67 RS |
2460 | goto symstarted; |
2461 | /* treat following character as a word constituent */ | |
2462 | case Sword: | |
2463 | case Ssymbol: | |
2464 | if (stopbefore) goto stop; /* this arg means stop at sexp start */ | |
93da5fff | 2465 | curlevel->last = prev_from; |
8489eb67 RS |
2466 | symstarted: |
2467 | while (from < end) | |
2468 | { | |
195d1361 | 2469 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
0220c518 | 2470 | switch (SWITCH_ENUM_CAST (SYNTAX (FETCH_CHAR (from)))) |
8489eb67 RS |
2471 | { |
2472 | case Scharquote: | |
2473 | case Sescape: | |
93da5fff | 2474 | INC_FROM; |
8489eb67 RS |
2475 | if (from == end) goto endquoted; |
2476 | break; | |
2477 | case Sword: | |
2478 | case Ssymbol: | |
2479 | case Squote: | |
2480 | break; | |
2481 | default: | |
2482 | goto symdone; | |
2483 | } | |
93da5fff | 2484 | INC_FROM; |
8489eb67 RS |
2485 | } |
2486 | symdone: | |
2487 | curlevel->prev = curlevel->last; | |
2488 | break; | |
2489 | ||
5a28e48c | 2490 | startincomment: |
195d1361 | 2491 | if (commentstop == 1) |
5a28e48c RS |
2492 | goto done; |
2493 | if (from != BEGV) | |
2494 | { | |
2495 | /* Enter the loop in the middle so that we find | |
2496 | a 2-char comment ender if we start in the middle of it. */ | |
93da5fff | 2497 | prev = FETCH_CHAR (prev_from); |
5a28e48c RS |
2498 | goto startincomment_1; |
2499 | } | |
2500 | /* At beginning of buffer, enter the loop the ordinary way. */ | |
195d1361 RS |
2501 | state.incomment = 1; |
2502 | goto commentloop; | |
5a28e48c | 2503 | |
8489eb67 RS |
2504 | case Scomment: |
2505 | state.incomment = 1; | |
195d1361 RS |
2506 | if (commentstop || boundary_stop) goto done; |
2507 | commentloop: | |
8489eb67 RS |
2508 | while (1) |
2509 | { | |
2510 | if (from == end) goto done; | |
195d1361 | 2511 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
e5d4f4dc RS |
2512 | prev = FETCH_CHAR (from); |
2513 | if (SYNTAX (prev) == Sendcomment | |
2514 | && SYNTAX_COMMENT_STYLE (prev) == state.comstyle) | |
2515 | /* Only terminate the comment section if the endcomment | |
2516 | of the same style as the start sequence has been | |
2517 | encountered. */ | |
8489eb67 | 2518 | break; |
195d1361 RS |
2519 | if (state.comstyle == ST_COMMENT_STYLE |
2520 | && SYNTAX (prev) == Scomment_fence) | |
2521 | break; | |
93da5fff | 2522 | INC_FROM; |
5a28e48c | 2523 | startincomment_1: |
8489eb67 | 2524 | if (from < end && SYNTAX_COMEND_FIRST (prev) |
e5d4f4dc RS |
2525 | && SYNTAX_COMEND_SECOND (FETCH_CHAR (from)) |
2526 | && SYNTAX_COMMENT_STYLE (prev) == state.comstyle) | |
2527 | /* Only terminate the comment section if the end-comment | |
2528 | sequence of the same style as the start sequence has | |
2529 | been encountered. */ | |
195d1361 | 2530 | { break; } |
8489eb67 | 2531 | } |
195d1361 | 2532 | INC_FROM; |
8489eb67 | 2533 | state.incomment = 0; |
e5d4f4dc | 2534 | state.comstyle = 0; /* reset the comment style */ |
195d1361 | 2535 | if (boundary_stop) goto done; |
8489eb67 RS |
2536 | break; |
2537 | ||
2538 | case Sopen: | |
2539 | if (stopbefore) goto stop; /* this arg means stop at sexp start */ | |
2540 | depth++; | |
2541 | /* curlevel++->last ran into compiler bug on Apollo */ | |
93da5fff | 2542 | curlevel->last = prev_from; |
8489eb67 RS |
2543 | if (++curlevel == endlevel) |
2544 | error ("Nesting too deep for parser"); | |
2545 | curlevel->prev = -1; | |
2546 | curlevel->last = -1; | |
30844415 | 2547 | if (targetdepth == depth) goto done; |
8489eb67 RS |
2548 | break; |
2549 | ||
2550 | case Sclose: | |
2551 | depth--; | |
2552 | if (depth < mindepth) | |
2553 | mindepth = depth; | |
2554 | if (curlevel != levelstart) | |
2555 | curlevel--; | |
2556 | curlevel->prev = curlevel->last; | |
30844415 | 2557 | if (targetdepth == depth) goto done; |
8489eb67 RS |
2558 | break; |
2559 | ||
2560 | case Sstring: | |
195d1361 RS |
2561 | case Sstring_fence: |
2562 | state.comstr_start = from - 1; | |
8489eb67 | 2563 | if (stopbefore) goto stop; /* this arg means stop at sexp start */ |
93da5fff | 2564 | curlevel->last = prev_from; |
195d1361 RS |
2565 | state.instring = (code == Sstring |
2566 | ? (FETCH_CHAR (prev_from)) | |
2567 | : ST_STRING_STYLE); | |
2568 | if (boundary_stop) goto done; | |
8489eb67 | 2569 | startinstring: |
195d1361 RS |
2570 | { |
2571 | nofence = state.instring != ST_STRING_STYLE; | |
2572 | ||
2573 | while (1) | |
2574 | { | |
2575 | int c; | |
2576 | ||
2577 | if (from >= end) goto done; | |
2578 | c = FETCH_CHAR (from); | |
2579 | if (nofence && c == state.instring) break; | |
2580 | UPDATE_SYNTAX_TABLE_FORWARD (from); | |
2581 | switch (SWITCH_ENUM_CAST (SYNTAX (c))) | |
2582 | { | |
2583 | case Sstring_fence: | |
2584 | if (!nofence) goto string_end; | |
2585 | break; | |
2586 | case Scharquote: | |
2587 | case Sescape: | |
2588 | INC_FROM; | |
2589 | startquotedinstring: | |
2590 | if (from >= end) goto endquoted; | |
2591 | } | |
2592 | INC_FROM; | |
2593 | } | |
2594 | } | |
2595 | string_end: | |
8489eb67 RS |
2596 | state.instring = -1; |
2597 | curlevel->prev = curlevel->last; | |
93da5fff | 2598 | INC_FROM; |
195d1361 | 2599 | if (boundary_stop) goto done; |
8489eb67 RS |
2600 | break; |
2601 | ||
2602 | case Smath: | |
2603 | break; | |
2604 | } | |
2605 | } | |
2606 | goto done; | |
2607 | ||
2608 | stop: /* Here if stopping before start of sexp. */ | |
93da5fff | 2609 | from = prev_from; /* We have just fetched the char that starts it; */ |
8489eb67 RS |
2610 | goto done; /* but return the position before it. */ |
2611 | ||
2612 | endquoted: | |
2613 | state.quoted = 1; | |
2614 | done: | |
2615 | state.depth = depth; | |
2616 | state.mindepth = mindepth; | |
2617 | state.thislevelstart = curlevel->prev; | |
2618 | state.prevlevelstart | |
2619 | = (curlevel == levelstart) ? -1 : (curlevel - 1)->last; | |
2620 | state.location = from; | |
2621 | immediate_quit = 0; | |
2622 | ||
e5d4f4dc | 2623 | *stateptr = state; |
8489eb67 RS |
2624 | } |
2625 | ||
2626 | /* This comment supplies the doc string for parse-partial-sexp, | |
2627 | for make-docfile to see. We cannot put this in the real DEFUN | |
2628 | due to limits in the Unix cpp. | |
2629 | ||
c81a3712 | 2630 | DEFUN ("parse-partial-sexp", Ffoo, Sfoo, 2, 6, 0, |
8489eb67 RS |
2631 | "Parse Lisp syntax starting at FROM until TO; return status of parse at TO.\n\ |
2632 | Parsing stops at TO or when certain criteria are met;\n\ | |
2633 | point is set to where parsing stops.\n\ | |
2634 | If fifth arg STATE is omitted or nil,\n\ | |
2635 | parsing assumes that FROM is the beginning of a function.\n\ | |
195d1361 | 2636 | Value is a list of nine elements describing final state of parsing:\n\ |
af50f9e5 RS |
2637 | 0. depth in parens.\n\ |
2638 | 1. character address of start of innermost containing list; nil if none.\n\ | |
2639 | 2. character address of start of last complete sexp terminated.\n\ | |
2640 | 3. non-nil if inside a string.\n\ | |
195d1361 RS |
2641 | (it is the character that will terminate the string,\n\ |
2642 | or t if the string should be terminated by an explicit\n\ | |
2643 | `syntax-table' property.)\n\ | |
af50f9e5 RS |
2644 | 4. t if inside a comment.\n\ |
2645 | 5. t if following a quote character.\n\ | |
2646 | 6. the minimum paren-depth encountered during this scan.\n\ | |
195d1361 RS |
2647 | 7. t if in a comment of style `b'; `syntax-table' if given by an explicit\n\ |
2648 | `syntax-table' property.\n\ | |
2649 | 8. character address of start of last comment or string; nil if none.\n\ | |
8489eb67 RS |
2650 | If third arg TARGETDEPTH is non-nil, parsing stops if the depth\n\ |
2651 | in parentheses becomes equal to TARGETDEPTH.\n\ | |
2652 | Fourth arg STOPBEFORE non-nil means stop when come to\n\ | |
2653 | any character that starts a sexp.\n\ | |
ec11639d | 2654 | Fifth arg STATE is an eight-list like what this function returns.\n\ |
a4275ad1 | 2655 | It is used to initialize the state of the parse. Its second and third |
c81a3712 | 2656 | elements are ignored. |
195d1361 RS |
2657 | Sixth arg COMMENTSTOP non-nil means stop at the start of a comment. If\n\ |
2658 | it is `syntax-table', stop after the start of a comment or a string, or\n\ | |
2659 | after end of a comment or a string.") | |
c81a3712 | 2660 | (from, to, targetdepth, stopbefore, state, commentstop) |
8489eb67 RS |
2661 | */ |
2662 | ||
c81a3712 | 2663 | DEFUN ("parse-partial-sexp", Fparse_partial_sexp, Sparse_partial_sexp, 2, 6, 0, |
8489eb67 | 2664 | 0 /* See immediately above */) |
c81a3712 RS |
2665 | (from, to, targetdepth, stopbefore, oldstate, commentstop) |
2666 | Lisp_Object from, to, targetdepth, stopbefore, oldstate, commentstop; | |
8489eb67 RS |
2667 | { |
2668 | struct lisp_parse_state state; | |
2669 | int target; | |
2670 | ||
265a9e55 | 2671 | if (!NILP (targetdepth)) |
8489eb67 RS |
2672 | { |
2673 | CHECK_NUMBER (targetdepth, 3); | |
2674 | target = XINT (targetdepth); | |
2675 | } | |
2676 | else | |
2677 | target = -100000; /* We won't reach this depth */ | |
2678 | ||
2679 | validate_region (&from, &to); | |
e5d4f4dc | 2680 | scan_sexps_forward (&state, XINT (from), XINT (to), |
c81a3712 | 2681 | target, !NILP (stopbefore), oldstate, |
195d1361 RS |
2682 | (NILP (commentstop) |
2683 | ? 0 : (EQ (commentstop, Qsyntax_table) ? -1 : 1))); | |
8489eb67 RS |
2684 | |
2685 | SET_PT (state.location); | |
2686 | ||
2687 | return Fcons (make_number (state.depth), | |
2688 | Fcons (state.prevlevelstart < 0 ? Qnil : make_number (state.prevlevelstart), | |
2689 | Fcons (state.thislevelstart < 0 ? Qnil : make_number (state.thislevelstart), | |
195d1361 RS |
2690 | Fcons (state.instring >= 0 |
2691 | ? (state.instring == ST_STRING_STYLE | |
2692 | ? Qt : make_number (state.instring)) : Qnil, | |
8489eb67 RS |
2693 | Fcons (state.incomment ? Qt : Qnil, |
2694 | Fcons (state.quoted ? Qt : Qnil, | |
e5d4f4dc | 2695 | Fcons (make_number (state.mindepth), |
195d1361 RS |
2696 | Fcons (state.comstyle |
2697 | ? (state.comstyle == ST_COMMENT_STYLE | |
2698 | ? Qsyntax_table : Qt) : Qnil, | |
2699 | Fcons (state.comstr_start != -1 ? make_number (state.comstr_start) : Qnil, | |
2700 | Qnil))))))))); | |
8489eb67 RS |
2701 | } |
2702 | \f | |
2703 | init_syntax_once () | |
2704 | { | |
78f9a1f7 | 2705 | register int i, c; |
8ea151b2 | 2706 | Lisp_Object temp; |
8489eb67 | 2707 | |
5ebaddf5 RS |
2708 | /* This has to be done here, before we call Fmake_char_table. */ |
2709 | Qsyntax_table = intern ("syntax-table"); | |
2710 | staticpro (&Qsyntax_table); | |
2711 | ||
2712 | /* Intern this now in case it isn't already done. | |
2713 | Setting this variable twice is harmless. | |
2714 | But don't staticpro it here--that is done in alloc.c. */ | |
2715 | Qchar_table_extra_slots = intern ("char-table-extra-slots"); | |
2716 | ||
93da5fff KH |
2717 | /* Create objects which can be shared among syntax tables. */ |
2718 | Vsyntax_code_object = Fmake_vector (13, Qnil); | |
2719 | for (i = 0; i < XVECTOR (Vsyntax_code_object)->size; i++) | |
2720 | XVECTOR (Vsyntax_code_object)->contents[i] | |
2721 | = Fcons (make_number (i), Qnil); | |
2722 | ||
5ebaddf5 RS |
2723 | /* Now we are ready to set up this property, so we can |
2724 | create syntax tables. */ | |
2725 | Fput (Qsyntax_table, Qchar_table_extra_slots, make_number (0)); | |
2726 | ||
93da5fff | 2727 | temp = XVECTOR (Vsyntax_code_object)->contents[(int) Swhitespace]; |
8489eb67 | 2728 | |
5ebaddf5 | 2729 | Vstandard_syntax_table = Fmake_char_table (Qsyntax_table, temp); |
8489eb67 | 2730 | |
93da5fff | 2731 | temp = XVECTOR (Vsyntax_code_object)->contents[(int) Sword]; |
8489eb67 | 2732 | for (i = 'a'; i <= 'z'; i++) |
8ea151b2 | 2733 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, i, temp); |
8489eb67 | 2734 | for (i = 'A'; i <= 'Z'; i++) |
8ea151b2 | 2735 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, i, temp); |
8489eb67 | 2736 | for (i = '0'; i <= '9'; i++) |
8ea151b2 RS |
2737 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, i, temp); |
2738 | ||
2739 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '$', temp); | |
2740 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '%', temp); | |
2741 | ||
2742 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '(', | |
2743 | Fcons (make_number (Sopen), make_number (')'))); | |
2744 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, ')', | |
2745 | Fcons (make_number (Sclose), make_number ('('))); | |
2746 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '[', | |
2747 | Fcons (make_number (Sopen), make_number (']'))); | |
2748 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, ']', | |
2749 | Fcons (make_number (Sclose), make_number ('['))); | |
2750 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '{', | |
2751 | Fcons (make_number (Sopen), make_number ('}'))); | |
2752 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '}', | |
2753 | Fcons (make_number (Sclose), make_number ('{'))); | |
2754 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '"', | |
2755 | Fcons (make_number ((int) Sstring), Qnil)); | |
2756 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '\\', | |
2757 | Fcons (make_number ((int) Sescape), Qnil)); | |
2758 | ||
93da5fff | 2759 | temp = XVECTOR (Vsyntax_code_object)->contents[(int) Ssymbol]; |
8489eb67 | 2760 | for (i = 0; i < 10; i++) |
78f9a1f7 KH |
2761 | { |
2762 | c = "_-+*/&|<>="[i]; | |
2763 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, c, temp); | |
2764 | } | |
8489eb67 | 2765 | |
93da5fff | 2766 | temp = XVECTOR (Vsyntax_code_object)->contents[(int) Spunct]; |
8489eb67 | 2767 | for (i = 0; i < 12; i++) |
78f9a1f7 KH |
2768 | { |
2769 | c = ".,;:?!#@~^'`"[i]; | |
2770 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, c, temp); | |
2771 | } | |
8489eb67 RS |
2772 | } |
2773 | ||
2774 | syms_of_syntax () | |
2775 | { | |
2776 | Qsyntax_table_p = intern ("syntax-table-p"); | |
2777 | staticpro (&Qsyntax_table_p); | |
2778 | ||
93da5fff KH |
2779 | staticpro (&Vsyntax_code_object); |
2780 | ||
7bf5e9e4 RS |
2781 | Qscan_error = intern ("scan-error"); |
2782 | staticpro (&Qscan_error); | |
2783 | Fput (Qscan_error, Qerror_conditions, | |
2784 | Fcons (Qerror, Qnil)); | |
2785 | Fput (Qscan_error, Qerror_message, | |
2786 | build_string ("Scan error")); | |
2787 | ||
8489eb67 RS |
2788 | DEFVAR_BOOL ("parse-sexp-ignore-comments", &parse_sexp_ignore_comments, |
2789 | "Non-nil means `forward-sexp', etc., should treat comments as whitespace."); | |
2790 | ||
195d1361 RS |
2791 | DEFVAR_BOOL ("parse-sexp-lookup-properties", &parse_sexp_lookup_properties, |
2792 | "Non-nil means `forward-sexp', etc., grant `syntax-table' property.\n\ | |
2793 | The value of this property should be either a syntax table, or a cons\n\ | |
2794 | of the form (SYNTAXCODE . MATCHCHAR), SYNTAXCODE being the numeric\n\ | |
2795 | syntax code, MATCHCHAR being nil or the character to match (which is\n\ | |
2796 | relevant only for open/close type."); | |
2797 | ||
8489eb67 RS |
2798 | words_include_escapes = 0; |
2799 | DEFVAR_BOOL ("words-include-escapes", &words_include_escapes, | |
2800 | "Non-nil means `forward-word', etc., should treat escape chars part of words."); | |
2801 | ||
2802 | defsubr (&Ssyntax_table_p); | |
2803 | defsubr (&Ssyntax_table); | |
2804 | defsubr (&Sstandard_syntax_table); | |
2805 | defsubr (&Scopy_syntax_table); | |
2806 | defsubr (&Sset_syntax_table); | |
2807 | defsubr (&Schar_syntax); | |
beefa22e | 2808 | defsubr (&Smatching_paren); |
8489eb67 RS |
2809 | defsubr (&Smodify_syntax_entry); |
2810 | defsubr (&Sdescribe_syntax); | |
2811 | ||
2812 | defsubr (&Sforward_word); | |
2813 | ||
195d1361 RS |
2814 | defsubr (&Sskip_chars_forward); |
2815 | defsubr (&Sskip_chars_backward); | |
2816 | defsubr (&Sskip_syntax_forward); | |
2817 | defsubr (&Sskip_syntax_backward); | |
2818 | ||
b3cfe0c8 | 2819 | defsubr (&Sforward_comment); |
8489eb67 RS |
2820 | defsubr (&Sscan_lists); |
2821 | defsubr (&Sscan_sexps); | |
2822 | defsubr (&Sbackward_prefix_chars); | |
2823 | defsubr (&Sparse_partial_sexp); | |
2824 | } |