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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; | |
2e34157c | 193 | if (EQ (Fsyntax_table_p (tmp_table), Qt)) |
195d1361 RS |
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 | |
527a32d9 KH |
336 | /* Checks whether FROM is at the end of a comment; |
337 | and if so, returns position of the start of the comment. | |
338 | But does not move back before STOP. | |
339 | Returns -1 if there is no comment ending at FROM. | |
340 | ||
341 | Global syntax data remains valid for backward search starting at | |
342 | the returned value (or at FROM, if the search was not successful). */ | |
195d1361 RS |
343 | |
344 | static int | |
ea315ed6 RS |
345 | back_comment (from, stop, comstyle) |
346 | int from, stop, comstyle; | |
195d1361 RS |
347 | { |
348 | /* Look back, counting the parity of string-quotes, | |
349 | and recording the comment-starters seen. | |
350 | When we reach a safe place, assume that's not in a string; | |
351 | then step the main scan to the earliest comment-starter seen | |
352 | an even number of string quotes away from the safe place. | |
353 | ||
354 | OFROM[I] is position of the earliest comment-starter seen | |
355 | which is I+2X quotes from the comment-end. | |
356 | PARITY is current parity of quotes from the comment end. */ | |
357 | int parity = 0; | |
358 | int my_stringend = 0; | |
359 | int string_lossage = 0; | |
360 | int comment_end = from; | |
361 | int comstart_pos = 0; | |
362 | int comstart_parity = 0; | |
363 | int scanstart = from - 1; | |
364 | register enum syntaxcode code; | |
ea315ed6 | 365 | int c; |
195d1361 RS |
366 | |
367 | /* At beginning of range to scan, we're outside of strings; | |
368 | that determines quote parity to the comment-end. */ | |
369 | while (from != stop) | |
370 | { | |
371 | /* Move back and examine a character. */ | |
372 | DEC_POS (from); | |
373 | UPDATE_SYNTAX_TABLE_BACKWARD (from); | |
374 | ||
375 | c = FETCH_CHAR (from); | |
376 | code = SYNTAX (c); | |
377 | ||
527a32d9 | 378 | /* If this char is the second of a 2-char comment end sequence, |
195d1361 RS |
379 | back up and give the pair the appropriate syntax. */ |
380 | if (from > stop && SYNTAX_COMEND_SECOND (c) | |
381 | && SYNTAX_COMEND_FIRST (FETCH_CHAR (from - 1))) | |
382 | { | |
383 | code = Sendcomment; | |
384 | DEC_POS (from); | |
385 | /* This is apparently the best we can do: */ | |
386 | UPDATE_SYNTAX_TABLE_BACKWARD (from); | |
387 | c = FETCH_CHAR (from); | |
388 | } | |
389 | ||
390 | /* If this char starts a 2-char comment start sequence, | |
391 | treat it like a 1-char comment starter. */ | |
527a32d9 KH |
392 | if (from < scanstart && SYNTAX_COMSTART_FIRST (c) |
393 | && SYNTAX_COMSTART_SECOND (FETCH_CHAR (from + 1)) | |
394 | && comstyle == SYNTAX_COMMENT_STYLE (FETCH_CHAR (from + 1))) | |
395 | code = Scomment; | |
195d1361 RS |
396 | |
397 | /* Ignore escaped characters. */ | |
398 | if (char_quoted (from)) | |
399 | continue; | |
400 | ||
401 | /* Track parity of quotes. */ | |
402 | if (code == Sstring) | |
403 | { | |
404 | parity ^= 1; | |
405 | if (my_stringend == 0) | |
406 | my_stringend = c; | |
407 | /* If we have two kinds of string delimiters. | |
408 | There's no way to grok this scanning backwards. */ | |
409 | else if (my_stringend != c) | |
410 | string_lossage = 1; | |
411 | } | |
412 | ||
413 | if (code == Sstring_fence || code == Scomment_fence) | |
414 | { | |
415 | parity ^= 1; | |
416 | if (my_stringend == 0) | |
417 | my_stringend = | |
418 | code == Sstring_fence ? ST_STRING_STYLE : ST_COMMENT_STYLE; | |
419 | /* If we have two kinds of string delimiters. | |
420 | There's no way to grok this scanning backwards. */ | |
421 | else if (my_stringend != (code == Sstring_fence | |
422 | ? ST_STRING_STYLE : ST_COMMENT_STYLE)) | |
423 | string_lossage = 1; | |
424 | } | |
425 | ||
426 | /* Record comment-starters according to that | |
427 | quote-parity to the comment-end. */ | |
428 | if (code == Scomment) | |
429 | { | |
430 | comstart_parity = parity; | |
431 | comstart_pos = from; | |
432 | } | |
433 | ||
434 | /* If we find another earlier comment-ender, | |
435 | any comment-starts earlier than that don't count | |
436 | (because they go with the earlier comment-ender). */ | |
437 | if (code == Sendcomment | |
438 | && SYNTAX_COMMENT_STYLE (FETCH_CHAR (from)) == comstyle) | |
439 | break; | |
440 | ||
441 | /* Assume a defun-start point is outside of strings. */ | |
442 | if (code == Sopen | |
443 | && (from == stop || FETCH_CHAR (from - 1) == '\n')) | |
444 | break; | |
445 | } | |
446 | ||
447 | if (comstart_pos == 0) | |
448 | { | |
449 | from = comment_end; | |
450 | UPDATE_SYNTAX_TABLE_FORWARD (comment_end - 1); | |
451 | } | |
452 | /* If the earliest comment starter | |
453 | is followed by uniform paired string quotes or none, | |
454 | we know it can't be inside a string | |
455 | since if it were then the comment ender would be inside one. | |
456 | So it does start a comment. Skip back to it. */ | |
457 | else if (comstart_parity == 0 && !string_lossage) | |
458 | { | |
459 | from = comstart_pos; | |
460 | /* Globals are correct now. */ | |
461 | } | |
462 | else | |
463 | { | |
464 | /* We had two kinds of string delimiters mixed up | |
465 | together. Decode this going forwards. | |
466 | Scan fwd from the previous comment ender | |
467 | to the one in question; this records where we | |
468 | last passed a comment starter. */ | |
469 | struct lisp_parse_state state; | |
470 | scan_sexps_forward (&state, find_defun_start (comment_end), | |
471 | comment_end - 1, -10000, 0, Qnil, 0); | |
472 | if (state.incomment) | |
473 | { | |
474 | /* scan_sexps_forward changed the direction of search in | |
475 | global variables, so we need to update it completely. */ | |
476 | ||
477 | from = state.comstr_start; | |
478 | } | |
479 | else | |
480 | { | |
481 | from = comment_end; | |
482 | } | |
483 | UPDATE_SYNTAX_TABLE_FORWARD (from - 1); | |
484 | } | |
485 | ||
486 | return from; | |
487 | } | |
488 | \f | |
8489eb67 | 489 | DEFUN ("syntax-table-p", Fsyntax_table_p, Ssyntax_table_p, 1, 1, 0, |
2203e1e8 | 490 | "Return t if OBJECT is a syntax table.\n\ |
8ea151b2 | 491 | Currently, any char-table counts as a syntax table.") |
2203e1e8 EN |
492 | (object) |
493 | Lisp_Object object; | |
8489eb67 | 494 | { |
2203e1e8 | 495 | if (CHAR_TABLE_P (object) |
e704cb4b | 496 | && EQ (XCHAR_TABLE (object)->purpose, Qsyntax_table)) |
8489eb67 RS |
497 | return Qt; |
498 | return Qnil; | |
499 | } | |
500 | ||
8ea151b2 | 501 | static void |
8489eb67 RS |
502 | check_syntax_table (obj) |
503 | Lisp_Object obj; | |
504 | { | |
d1be9f0f | 505 | if (!(CHAR_TABLE_P (obj) |
e704cb4b | 506 | && EQ (XCHAR_TABLE (obj)->purpose, Qsyntax_table))) |
d1be9f0f | 507 | wrong_type_argument (Qsyntax_table_p, obj); |
8489eb67 RS |
508 | } |
509 | ||
8489eb67 RS |
510 | DEFUN ("syntax-table", Fsyntax_table, Ssyntax_table, 0, 0, 0, |
511 | "Return the current syntax table.\n\ | |
512 | This is the one specified by the current buffer.") | |
513 | () | |
514 | { | |
515 | return current_buffer->syntax_table; | |
516 | } | |
517 | ||
518 | DEFUN ("standard-syntax-table", Fstandard_syntax_table, | |
519 | Sstandard_syntax_table, 0, 0, 0, | |
520 | "Return the standard syntax table.\n\ | |
521 | This is the one used for new buffers.") | |
522 | () | |
523 | { | |
524 | return Vstandard_syntax_table; | |
525 | } | |
526 | ||
527 | DEFUN ("copy-syntax-table", Fcopy_syntax_table, Scopy_syntax_table, 0, 1, 0, | |
528 | "Construct a new syntax table and return it.\n\ | |
529 | It is a copy of the TABLE, which defaults to the standard syntax table.") | |
530 | (table) | |
531 | Lisp_Object table; | |
532 | { | |
8ea151b2 RS |
533 | Lisp_Object copy; |
534 | ||
265a9e55 | 535 | if (!NILP (table)) |
8ea151b2 RS |
536 | check_syntax_table (table); |
537 | else | |
538 | table = Vstandard_syntax_table; | |
539 | ||
540 | copy = Fcopy_sequence (table); | |
0f867324 RS |
541 | |
542 | /* Only the standard syntax table should have a default element. | |
543 | Other syntax tables should inherit from parents instead. */ | |
544 | XCHAR_TABLE (copy)->defalt = Qnil; | |
545 | ||
546 | /* Copied syntax tables should all have parents. | |
547 | If we copied one with no parent, such as the standard syntax table, | |
548 | use the standard syntax table as the copy's parent. */ | |
549 | if (NILP (XCHAR_TABLE (copy)->parent)) | |
550 | Fset_char_table_parent (copy, Vstandard_syntax_table); | |
8ea151b2 | 551 | return copy; |
8489eb67 RS |
552 | } |
553 | ||
554 | DEFUN ("set-syntax-table", Fset_syntax_table, Sset_syntax_table, 1, 1, 0, | |
555 | "Select a new syntax table for the current buffer.\n\ | |
556 | One argument, a syntax table.") | |
557 | (table) | |
558 | Lisp_Object table; | |
559 | { | |
8ea151b2 | 560 | check_syntax_table (table); |
8489eb67 RS |
561 | current_buffer->syntax_table = table; |
562 | /* Indicate that this buffer now has a specified syntax table. */ | |
f110a664 RS |
563 | current_buffer->local_var_flags |
564 | |= XFASTINT (buffer_local_flags.syntax_table); | |
8489eb67 RS |
565 | return table; |
566 | } | |
567 | \f | |
568 | /* Convert a letter which signifies a syntax code | |
569 | into the code it signifies. | |
195d1361 | 570 | This is used by modify-syntax-entry, and other things. */ |
8489eb67 RS |
571 | |
572 | unsigned char syntax_spec_code[0400] = | |
573 | { 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
574 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
575 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
576 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
195d1361 | 577 | (char) Swhitespace, (char) Scomment_fence, (char) Sstring, 0377, |
8489eb67 RS |
578 | (char) Smath, 0377, 0377, (char) Squote, |
579 | (char) Sopen, (char) Sclose, 0377, 0377, | |
580 | 0377, (char) Swhitespace, (char) Spunct, (char) Scharquote, | |
581 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
582 | 0377, 0377, 0377, 0377, | |
583 | (char) Scomment, 0377, (char) Sendcomment, 0377, | |
6cb71bf6 | 584 | (char) Sinherit, 0377, 0377, 0377, 0377, 0377, 0377, 0377, /* @, A ... */ |
8489eb67 RS |
585 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, |
586 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, (char) Sword, | |
587 | 0377, 0377, 0377, 0377, (char) Sescape, 0377, 0377, (char) Ssymbol, | |
588 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, /* `, a, ... */ | |
589 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
590 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, (char) Sword, | |
195d1361 | 591 | 0377, 0377, 0377, 0377, (char) Sstring_fence, 0377, 0377, 0377 |
8489eb67 RS |
592 | }; |
593 | ||
195d1361 | 594 | /* Indexed by syntax code, give the letter that describes it. */ |
8489eb67 | 595 | |
195d1361 | 596 | char syntax_code_spec[16] = |
8489eb67 | 597 | { |
195d1361 RS |
598 | ' ', '.', 'w', '_', '(', ')', '\'', '\"', '$', '\\', '/', '<', '>', '@', |
599 | '!', '|' | |
8489eb67 | 600 | }; |
93da5fff KH |
601 | |
602 | /* Indexed by syntax code, give the object (cons of syntax code and | |
603 | nil) to be stored in syntax table. Since these objects can be | |
604 | shared among syntax tables, we generate them in advance. By | |
605 | sharing objects, the function `describe-syntax' can give a more | |
606 | compact listing. */ | |
607 | static Lisp_Object Vsyntax_code_object; | |
608 | ||
8489eb67 | 609 | \f |
8ea151b2 RS |
610 | /* Look up the value for CHARACTER in syntax table TABLE's parent |
611 | and its parents. SYNTAX_ENTRY calls this, when TABLE itself has nil | |
612 | for CHARACTER. It's actually used only when not compiled with GCC. */ | |
613 | ||
614 | Lisp_Object | |
615 | syntax_parent_lookup (table, character) | |
616 | Lisp_Object table; | |
617 | int character; | |
618 | { | |
619 | Lisp_Object value; | |
620 | ||
621 | while (1) | |
622 | { | |
623 | table = XCHAR_TABLE (table)->parent; | |
624 | if (NILP (table)) | |
625 | return Qnil; | |
626 | ||
627 | value = XCHAR_TABLE (table)->contents[character]; | |
628 | if (!NILP (value)) | |
629 | return value; | |
630 | } | |
631 | } | |
632 | ||
8489eb67 | 633 | DEFUN ("char-syntax", Fchar_syntax, Schar_syntax, 1, 1, 0, |
2203e1e8 EN |
634 | "Return the syntax code of CHARACTER, described by a character.\n\ |
635 | For example, if CHARACTER is a word constituent,\n\ | |
636 | the character `w' is returned.\n\ | |
8489eb67 RS |
637 | The characters that correspond to various syntax codes\n\ |
638 | are listed in the documentation of `modify-syntax-entry'.") | |
2203e1e8 EN |
639 | (character) |
640 | Lisp_Object character; | |
8489eb67 | 641 | { |
8ea151b2 | 642 | int char_int; |
195d1361 RS |
643 | gl_state.current_syntax_table = current_buffer->syntax_table; |
644 | ||
645 | gl_state.use_global = 0; | |
2203e1e8 EN |
646 | CHECK_NUMBER (character, 0); |
647 | char_int = XINT (character); | |
8ea151b2 | 648 | return make_number (syntax_code_spec[(int) SYNTAX (char_int)]); |
beefa22e RS |
649 | } |
650 | ||
651 | DEFUN ("matching-paren", Fmatching_paren, Smatching_paren, 1, 1, 0, | |
2203e1e8 EN |
652 | "Return the matching parenthesis of CHARACTER, or nil if none.") |
653 | (character) | |
654 | Lisp_Object character; | |
beefa22e | 655 | { |
8ea151b2 | 656 | int char_int, code; |
195d1361 RS |
657 | gl_state.current_syntax_table = current_buffer->syntax_table; |
658 | gl_state.use_global = 0; | |
2203e1e8 EN |
659 | CHECK_NUMBER (character, 0); |
660 | char_int = XINT (character); | |
8ea151b2 | 661 | code = SYNTAX (char_int); |
a8bd7cd8 | 662 | if (code == Sopen || code == Sclose) |
2e34157c | 663 | return SYNTAX_MATCH (char_int); |
beefa22e | 664 | return Qnil; |
8489eb67 RS |
665 | } |
666 | ||
667 | /* This comment supplies the doc string for modify-syntax-entry, | |
668 | for make-docfile to see. We cannot put this in the real DEFUN | |
669 | due to limits in the Unix cpp. | |
670 | ||
2fcea188 | 671 | DEFUN ("modify-syntax-entry", foo, bar, 2, 3, 0, |
8489eb67 RS |
672 | "Set syntax for character CHAR according to string S.\n\ |
673 | The syntax is changed only for table TABLE, which defaults to\n\ | |
674 | the current buffer's syntax table.\n\ | |
675 | The first character of S should be one of the following:\n\ | |
32676c08 JB |
676 | Space or - whitespace syntax. w word constituent.\n\ |
677 | _ symbol constituent. . punctuation.\n\ | |
678 | ( open-parenthesis. ) close-parenthesis.\n\ | |
679 | \" string quote. \\ escape.\n\ | |
680 | $ paired delimiter. ' expression quote or prefix operator.\n\ | |
abae13bd | 681 | < comment starter. > comment ender.\n\ |
6cb71bf6 | 682 | / character-quote. @ inherit from `standard-syntax-table'.\n\ |
abae13bd | 683 | \n\ |
8489eb67 RS |
684 | Only single-character comment start and end sequences are represented thus.\n\ |
685 | Two-character sequences are represented as described below.\n\ | |
686 | The second character of S is the matching parenthesis,\n\ | |
687 | used only if the first character is `(' or `)'.\n\ | |
688 | Any additional characters are flags.\n\ | |
e5d4f4dc | 689 | Defined flags are the characters 1, 2, 3, 4, b, and p.\n\ |
2203e1e8 EN |
690 | 1 means CHAR is the start of a two-char comment start sequence.\n\ |
691 | 2 means CHAR is the second character of such a sequence.\n\ | |
692 | 3 means CHAR is the start of a two-char comment end sequence.\n\ | |
693 | 4 means CHAR is the second character of such a sequence.\n\ | |
e5d4f4dc | 694 | \n\ |
195d1361 | 695 | There can be up to two orthogonal comment sequences. This is to support\n\ |
e5d4f4dc | 696 | language modes such as C++. By default, all comment sequences are of style\n\ |
abae13bd RS |
697 | a, but you can set the comment sequence style to b (on the second character\n\ |
698 | of a comment-start, or the first character of a comment-end sequence) using\n\ | |
e5d4f4dc | 699 | this flag:\n\ |
2203e1e8 | 700 | b means CHAR is part of comment sequence b.\n\ |
e5d4f4dc | 701 | \n\ |
2203e1e8 | 702 | p means CHAR is a prefix character for `backward-prefix-chars';\n\ |
e5d4f4dc | 703 | such characters are treated as whitespace when they occur\n\ |
8489eb67 | 704 | between expressions.") |
2fcea188 | 705 | (char, s, table) |
8489eb67 RS |
706 | */ |
707 | ||
708 | DEFUN ("modify-syntax-entry", Fmodify_syntax_entry, Smodify_syntax_entry, 2, 3, | |
709 | /* I really don't know why this is interactive | |
710 | help-form should at least be made useful whilst reading the second arg | |
711 | */ | |
712 | "cSet syntax for character: \nsSet syntax for %s to: ", | |
713 | 0 /* See immediately above */) | |
714 | (c, newentry, syntax_table) | |
715 | Lisp_Object c, newentry, syntax_table; | |
716 | { | |
8ea151b2 | 717 | register unsigned char *p; |
8489eb67 | 718 | register enum syntaxcode code; |
247e20a8 | 719 | int val; |
8ea151b2 | 720 | Lisp_Object match; |
8489eb67 RS |
721 | |
722 | CHECK_NUMBER (c, 0); | |
723 | CHECK_STRING (newentry, 1); | |
8ea151b2 | 724 | |
265a9e55 | 725 | if (NILP (syntax_table)) |
8489eb67 RS |
726 | syntax_table = current_buffer->syntax_table; |
727 | else | |
8ea151b2 | 728 | check_syntax_table (syntax_table); |
8489eb67 RS |
729 | |
730 | p = XSTRING (newentry)->data; | |
731 | code = (enum syntaxcode) syntax_spec_code[*p++]; | |
732 | if (((int) code & 0377) == 0377) | |
2e34157c | 733 | error ("invalid syntax description letter: %c", p[-1]); |
8489eb67 | 734 | |
8ea151b2 RS |
735 | if (code == Sinherit) |
736 | { | |
e704cb4b | 737 | SET_RAW_SYNTAX_ENTRY (syntax_table, XINT (c), Qnil); |
8ea151b2 RS |
738 | return Qnil; |
739 | } | |
740 | ||
741 | if (*p) | |
d1be9f0f | 742 | { |
93da5fff KH |
743 | int len; |
744 | int character = STRING_CHAR_AND_LENGTH (p, XSTRING (newentry)->size - 1, | |
745 | len); | |
746 | XSETINT (match, character); | |
d1be9f0f RS |
747 | if (XFASTINT (match) == ' ') |
748 | match = Qnil; | |
93da5fff | 749 | p += len; |
d1be9f0f RS |
750 | } |
751 | else | |
8ea151b2 | 752 | match = Qnil; |
8489eb67 | 753 | |
8ea151b2 | 754 | val = (int) code; |
8489eb67 RS |
755 | while (*p) |
756 | switch (*p++) | |
757 | { | |
758 | case '1': | |
247e20a8 | 759 | val |= 1 << 16; |
8489eb67 RS |
760 | break; |
761 | ||
762 | case '2': | |
247e20a8 | 763 | val |= 1 << 17; |
8489eb67 RS |
764 | break; |
765 | ||
766 | case '3': | |
247e20a8 | 767 | val |= 1 << 18; |
8489eb67 RS |
768 | break; |
769 | ||
770 | case '4': | |
247e20a8 | 771 | val |= 1 << 19; |
8489eb67 RS |
772 | break; |
773 | ||
774 | case 'p': | |
247e20a8 | 775 | val |= 1 << 20; |
8489eb67 | 776 | break; |
e5d4f4dc RS |
777 | |
778 | case 'b': | |
247e20a8 | 779 | val |= 1 << 21; |
e5d4f4dc | 780 | break; |
8489eb67 RS |
781 | } |
782 | ||
93da5fff KH |
783 | if (val < XVECTOR (Vsyntax_code_object)->size && NILP (match)) |
784 | newentry = XVECTOR (Vsyntax_code_object)->contents[val]; | |
785 | else | |
786 | /* Since we can't use a shared object, let's make a new one. */ | |
787 | newentry = Fcons (make_number (val), match); | |
788 | ||
e704cb4b | 789 | SET_RAW_SYNTAX_ENTRY (syntax_table, XINT (c), newentry); |
8489eb67 RS |
790 | |
791 | return Qnil; | |
792 | } | |
793 | \f | |
794 | /* Dump syntax table to buffer in human-readable format */ | |
795 | ||
340f92b5 | 796 | static void |
8489eb67 RS |
797 | describe_syntax (value) |
798 | Lisp_Object value; | |
799 | { | |
800 | register enum syntaxcode code; | |
e5d4f4dc | 801 | char desc, match, start1, start2, end1, end2, prefix, comstyle; |
8489eb67 | 802 | char str[2]; |
8ea151b2 | 803 | Lisp_Object first, match_lisp; |
8489eb67 RS |
804 | |
805 | Findent_to (make_number (16), make_number (1)); | |
806 | ||
8ea151b2 RS |
807 | if (NILP (value)) |
808 | { | |
93da5fff | 809 | insert_string ("default\n"); |
8ea151b2 RS |
810 | return; |
811 | } | |
812 | ||
908b7fea KH |
813 | if (CHAR_TABLE_P (value)) |
814 | { | |
815 | insert_string ("deeper char-table ...\n"); | |
816 | return; | |
817 | } | |
818 | ||
8ea151b2 RS |
819 | if (!CONSP (value)) |
820 | { | |
93da5fff | 821 | insert_string ("invalid\n"); |
8ea151b2 RS |
822 | return; |
823 | } | |
824 | ||
825 | first = XCONS (value)->car; | |
826 | match_lisp = XCONS (value)->cdr; | |
827 | ||
828 | if (!INTEGERP (first) || !(NILP (match_lisp) || INTEGERP (match_lisp))) | |
8489eb67 | 829 | { |
93da5fff | 830 | insert_string ("invalid\n"); |
8489eb67 RS |
831 | return; |
832 | } | |
833 | ||
e704cb4b | 834 | code = (enum syntaxcode) (XINT (first) & 0377); |
8ea151b2 RS |
835 | start1 = (XINT (first) >> 16) & 1; |
836 | start2 = (XINT (first) >> 17) & 1; | |
837 | end1 = (XINT (first) >> 18) & 1; | |
838 | end2 = (XINT (first) >> 19) & 1; | |
839 | prefix = (XINT (first) >> 20) & 1; | |
840 | comstyle = (XINT (first) >> 21) & 1; | |
8489eb67 RS |
841 | |
842 | if ((int) code < 0 || (int) code >= (int) Smax) | |
843 | { | |
844 | insert_string ("invalid"); | |
845 | return; | |
846 | } | |
847 | desc = syntax_code_spec[(int) code]; | |
848 | ||
849 | str[0] = desc, str[1] = 0; | |
850 | insert (str, 1); | |
851 | ||
93da5fff KH |
852 | if (NILP (match_lisp)) |
853 | insert (" ", 1); | |
854 | else | |
855 | insert_char (XINT (match_lisp)); | |
8489eb67 | 856 | |
8489eb67 RS |
857 | if (start1) |
858 | insert ("1", 1); | |
859 | if (start2) | |
860 | insert ("2", 1); | |
861 | ||
862 | if (end1) | |
863 | insert ("3", 1); | |
864 | if (end2) | |
865 | insert ("4", 1); | |
866 | ||
867 | if (prefix) | |
868 | insert ("p", 1); | |
e5d4f4dc RS |
869 | if (comstyle) |
870 | insert ("b", 1); | |
8489eb67 RS |
871 | |
872 | insert_string ("\twhich means: "); | |
873 | ||
0220c518 | 874 | switch (SWITCH_ENUM_CAST (code)) |
8489eb67 RS |
875 | { |
876 | case Swhitespace: | |
877 | insert_string ("whitespace"); break; | |
878 | case Spunct: | |
879 | insert_string ("punctuation"); break; | |
880 | case Sword: | |
881 | insert_string ("word"); break; | |
882 | case Ssymbol: | |
883 | insert_string ("symbol"); break; | |
884 | case Sopen: | |
885 | insert_string ("open"); break; | |
886 | case Sclose: | |
887 | insert_string ("close"); break; | |
888 | case Squote: | |
889 | insert_string ("quote"); break; | |
890 | case Sstring: | |
891 | insert_string ("string"); break; | |
892 | case Smath: | |
893 | insert_string ("math"); break; | |
894 | case Sescape: | |
895 | insert_string ("escape"); break; | |
896 | case Scharquote: | |
897 | insert_string ("charquote"); break; | |
898 | case Scomment: | |
899 | insert_string ("comment"); break; | |
900 | case Sendcomment: | |
901 | insert_string ("endcomment"); break; | |
902 | default: | |
903 | insert_string ("invalid"); | |
904 | return; | |
905 | } | |
906 | ||
8ea151b2 | 907 | if (!NILP (match_lisp)) |
8489eb67 RS |
908 | { |
909 | insert_string (", matches "); | |
8ea151b2 | 910 | insert_char (XINT (match_lisp)); |
8489eb67 RS |
911 | } |
912 | ||
913 | if (start1) | |
914 | insert_string (",\n\t is the first character of a comment-start sequence"); | |
915 | if (start2) | |
916 | insert_string (",\n\t is the second character of a comment-start sequence"); | |
917 | ||
918 | if (end1) | |
919 | insert_string (",\n\t is the first character of a comment-end sequence"); | |
920 | if (end2) | |
921 | insert_string (",\n\t is the second character of a comment-end sequence"); | |
e5d4f4dc RS |
922 | if (comstyle) |
923 | insert_string (" (comment style b)"); | |
924 | ||
8489eb67 RS |
925 | if (prefix) |
926 | insert_string (",\n\t is a prefix character for `backward-prefix-chars'"); | |
927 | ||
928 | insert_string ("\n"); | |
929 | } | |
930 | ||
340f92b5 | 931 | static Lisp_Object |
8489eb67 RS |
932 | describe_syntax_1 (vector) |
933 | Lisp_Object vector; | |
934 | { | |
935 | struct buffer *old = current_buffer; | |
936 | set_buffer_internal (XBUFFER (Vstandard_output)); | |
e41819d4 | 937 | describe_vector (vector, Qnil, describe_syntax, 0, Qnil, Qnil, (int *) 0, 0); |
93da5fff KH |
938 | while (! NILP (XCHAR_TABLE (vector)->parent)) |
939 | { | |
940 | vector = XCHAR_TABLE (vector)->parent; | |
941 | insert_string ("\nThe parent syntax table is:"); | |
e41819d4 RS |
942 | describe_vector (vector, Qnil, describe_syntax, 0, Qnil, Qnil, |
943 | (int *) 0, 0); | |
93da5fff KH |
944 | } |
945 | ||
36cd82fe | 946 | call0 (intern ("help-mode")); |
8489eb67 RS |
947 | set_buffer_internal (old); |
948 | return Qnil; | |
949 | } | |
950 | ||
951 | DEFUN ("describe-syntax", Fdescribe_syntax, Sdescribe_syntax, 0, 0, "", | |
952 | "Describe the syntax specifications in the syntax table.\n\ | |
953 | The descriptions are inserted in a buffer, which is then displayed.") | |
954 | () | |
955 | { | |
956 | internal_with_output_to_temp_buffer | |
957 | ("*Help*", describe_syntax_1, current_buffer->syntax_table); | |
958 | ||
959 | return Qnil; | |
960 | } | |
961 | \f | |
195d1361 RS |
962 | int parse_sexp_ignore_comments; |
963 | ||
8489eb67 RS |
964 | /* Return the position across COUNT words from FROM. |
965 | If that many words cannot be found before the end of the buffer, return 0. | |
966 | COUNT negative means scan backward and stop at word beginning. */ | |
967 | ||
968 | scan_words (from, count) | |
969 | register int from, count; | |
970 | { | |
971 | register int beg = BEGV; | |
972 | register int end = ZV; | |
93da5fff KH |
973 | register enum syntaxcode code; |
974 | int ch0, ch1; | |
975 | int temp_pos; | |
8489eb67 RS |
976 | |
977 | immediate_quit = 1; | |
978 | QUIT; | |
979 | ||
195d1361 RS |
980 | SETUP_SYNTAX_TABLE (from, count); |
981 | ||
8489eb67 RS |
982 | while (count > 0) |
983 | { | |
984 | while (1) | |
985 | { | |
986 | if (from == end) | |
987 | { | |
988 | immediate_quit = 0; | |
989 | return 0; | |
990 | } | |
195d1361 | 991 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
93da5fff KH |
992 | ch0 = FETCH_CHAR (from); |
993 | code = SYNTAX (ch0); | |
994 | INC_POS (from); | |
8489eb67 RS |
995 | if (words_include_escapes |
996 | && (code == Sescape || code == Scharquote)) | |
997 | break; | |
998 | if (code == Sword) | |
999 | break; | |
8489eb67 | 1000 | } |
93da5fff KH |
1001 | /* Now CH0 is a character which begins a word and FROM is the |
1002 | position of the next character. */ | |
8489eb67 RS |
1003 | while (1) |
1004 | { | |
1005 | if (from == end) break; | |
195d1361 | 1006 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
93da5fff KH |
1007 | ch1 = FETCH_CHAR (from); |
1008 | code = SYNTAX (ch1); | |
8489eb67 RS |
1009 | if (!(words_include_escapes |
1010 | && (code == Sescape || code == Scharquote))) | |
93da5fff | 1011 | if (code != Sword || WORD_BOUNDARY_P (ch0, ch1)) |
8489eb67 | 1012 | break; |
93da5fff KH |
1013 | INC_POS (from); |
1014 | ch0 = ch1; | |
8489eb67 RS |
1015 | } |
1016 | count--; | |
1017 | } | |
1018 | while (count < 0) | |
1019 | { | |
1020 | while (1) | |
1021 | { | |
1022 | if (from == beg) | |
1023 | { | |
1024 | immediate_quit = 0; | |
1025 | return 0; | |
1026 | } | |
93da5fff | 1027 | DEC_POS (from); |
195d1361 | 1028 | UPDATE_SYNTAX_TABLE_BACKWARD (from); |
93da5fff KH |
1029 | ch1 = FETCH_CHAR (from); |
1030 | code = SYNTAX (ch1); | |
8489eb67 RS |
1031 | if (words_include_escapes |
1032 | && (code == Sescape || code == Scharquote)) | |
1033 | break; | |
1034 | if (code == Sword) | |
1035 | break; | |
8489eb67 | 1036 | } |
93da5fff KH |
1037 | /* Now CH1 is a character which ends a word and FROM is the |
1038 | position of it. */ | |
8489eb67 RS |
1039 | while (1) |
1040 | { | |
1041 | if (from == beg) break; | |
93da5fff KH |
1042 | temp_pos = from; |
1043 | DEC_POS (temp_pos); | |
195d1361 | 1044 | UPDATE_SYNTAX_TABLE_BACKWARD (from); |
93da5fff KH |
1045 | ch0 = FETCH_CHAR (temp_pos); |
1046 | code = SYNTAX (ch0); | |
8489eb67 RS |
1047 | if (!(words_include_escapes |
1048 | && (code == Sescape || code == Scharquote))) | |
93da5fff | 1049 | if (code != Sword || WORD_BOUNDARY_P (ch0, ch1)) |
8489eb67 | 1050 | break; |
93da5fff KH |
1051 | from = temp_pos; |
1052 | ch1 = ch0; | |
8489eb67 RS |
1053 | } |
1054 | count++; | |
1055 | } | |
1056 | ||
1057 | immediate_quit = 0; | |
1058 | ||
1059 | return from; | |
1060 | } | |
1061 | ||
1062 | DEFUN ("forward-word", Fforward_word, Sforward_word, 1, 1, "p", | |
1063 | "Move point forward ARG words (backward if ARG is negative).\n\ | |
1064 | Normally returns t.\n\ | |
1065 | If an edge of the buffer is reached, point is left there\n\ | |
1066 | and nil is returned.") | |
1067 | (count) | |
1068 | Lisp_Object count; | |
1069 | { | |
1070 | int val; | |
1071 | CHECK_NUMBER (count, 0); | |
1072 | ||
6ec8bbd2 | 1073 | if (!(val = scan_words (PT, XINT (count)))) |
8489eb67 RS |
1074 | { |
1075 | SET_PT (XINT (count) > 0 ? ZV : BEGV); | |
1076 | return Qnil; | |
1077 | } | |
1078 | SET_PT (val); | |
1079 | return Qt; | |
1080 | } | |
1081 | \f | |
195d1361 RS |
1082 | Lisp_Object skip_chars (); |
1083 | ||
1084 | DEFUN ("skip-chars-forward", Fskip_chars_forward, Sskip_chars_forward, 1, 2, 0, | |
1085 | "Move point forward, stopping before a char not in STRING, or at pos LIM.\n\ | |
1086 | STRING is like the inside of a `[...]' in a regular expression\n\ | |
1087 | except that `]' is never special and `\\' quotes `^', `-' or `\\'.\n\ | |
1088 | Thus, with arg \"a-zA-Z\", this skips letters stopping before first nonletter.\n\ | |
1089 | With arg \"^a-zA-Z\", skips nonletters stopping before first letter.\n\ | |
1090 | Returns the distance traveled, either zero or positive.") | |
1091 | (string, lim) | |
1092 | Lisp_Object string, lim; | |
1093 | { | |
1094 | return skip_chars (1, 0, string, lim); | |
1095 | } | |
1096 | ||
1097 | DEFUN ("skip-chars-backward", Fskip_chars_backward, Sskip_chars_backward, 1, 2, 0, | |
1098 | "Move point backward, stopping after a char not in STRING, or at pos LIM.\n\ | |
1099 | See `skip-chars-forward' for details.\n\ | |
1100 | Returns the distance traveled, either zero or negative.") | |
1101 | (string, lim) | |
1102 | Lisp_Object string, lim; | |
1103 | { | |
1104 | return skip_chars (0, 0, string, lim); | |
1105 | } | |
1106 | ||
1107 | DEFUN ("skip-syntax-forward", Fskip_syntax_forward, Sskip_syntax_forward, 1, 2, 0, | |
1108 | "Move point forward across chars in specified syntax classes.\n\ | |
1109 | SYNTAX is a string of syntax code characters.\n\ | |
1110 | Stop before a char whose syntax is not in SYNTAX, or at position LIM.\n\ | |
1111 | If SYNTAX starts with ^, skip characters whose syntax is NOT in SYNTAX.\n\ | |
1112 | This function returns the distance traveled, either zero or positive.") | |
1113 | (syntax, lim) | |
1114 | Lisp_Object syntax, lim; | |
1115 | { | |
1116 | return skip_chars (1, 1, syntax, lim); | |
1117 | } | |
1118 | ||
1119 | DEFUN ("skip-syntax-backward", Fskip_syntax_backward, Sskip_syntax_backward, 1, 2, 0, | |
1120 | "Move point backward across chars in specified syntax classes.\n\ | |
1121 | SYNTAX is a string of syntax code characters.\n\ | |
1122 | Stop on reaching a char whose syntax is not in SYNTAX, or at position LIM.\n\ | |
1123 | If SYNTAX starts with ^, skip characters whose syntax is NOT in SYNTAX.\n\ | |
1124 | This function returns the distance traveled, either zero or negative.") | |
1125 | (syntax, lim) | |
1126 | Lisp_Object syntax, lim; | |
1127 | { | |
1128 | return skip_chars (0, 1, syntax, lim); | |
1129 | } | |
1130 | ||
1131 | Lisp_Object | |
1132 | skip_chars (forwardp, syntaxp, string, lim) | |
1133 | int forwardp, syntaxp; | |
1134 | Lisp_Object string, lim; | |
1135 | { | |
1136 | register unsigned char *p, *pend; | |
1137 | register unsigned int c; | |
7e68b0ea | 1138 | register int ch; |
195d1361 | 1139 | unsigned char fastmap[0400]; |
7e68b0ea RS |
1140 | /* If SYNTAXP is 0, STRING may contain multi-byte form of characters |
1141 | of which codes don't fit in FASTMAP. In that case, we set the | |
1142 | first byte of multibyte form (i.e. base leading-code) in FASTMAP | |
1143 | and set the actual ranges of characters in CHAR_RANGES. In the | |
1144 | form "X-Y" of STRING, both X and Y must belong to the same | |
1145 | character set because a range striding across character sets is | |
1146 | meaningless. */ | |
5df4982e | 1147 | int *char_ranges; |
7e68b0ea | 1148 | int n_char_ranges = 0; |
195d1361 RS |
1149 | int negate = 0; |
1150 | register int i; | |
7e68b0ea | 1151 | int multibyte = !NILP (current_buffer->enable_multibyte_characters); |
195d1361 RS |
1152 | |
1153 | CHECK_STRING (string, 0); | |
5df4982e | 1154 | char_ranges = (int *) alloca (XSTRING (string)->size * (sizeof (int)) * 2); |
195d1361 RS |
1155 | |
1156 | if (NILP (lim)) | |
1157 | XSETINT (lim, forwardp ? ZV : BEGV); | |
1158 | else | |
1159 | CHECK_NUMBER_COERCE_MARKER (lim, 1); | |
1160 | ||
1161 | /* In any case, don't allow scan outside bounds of buffer. */ | |
1162 | /* jla turned this off, for no known reason. | |
1163 | bfox turned the ZV part on, and rms turned the | |
1164 | BEGV part back on. */ | |
1165 | if (XINT (lim) > ZV) | |
1166 | XSETFASTINT (lim, ZV); | |
1167 | if (XINT (lim) < BEGV) | |
1168 | XSETFASTINT (lim, BEGV); | |
1169 | ||
1170 | p = XSTRING (string)->data; | |
1171 | pend = p + XSTRING (string)->size; | |
1172 | bzero (fastmap, sizeof fastmap); | |
1173 | ||
1174 | if (p != pend && *p == '^') | |
1175 | { | |
1176 | negate = 1; p++; | |
1177 | } | |
1178 | ||
1179 | /* Find the characters specified and set their elements of fastmap. | |
1180 | If syntaxp, each character counts as itself. | |
1181 | Otherwise, handle backslashes and ranges specially. */ | |
1182 | ||
1183 | while (p != pend) | |
1184 | { | |
7e68b0ea RS |
1185 | c = *p; |
1186 | if (multibyte) | |
1187 | { | |
1188 | ch = STRING_CHAR (p, pend - p); | |
1189 | p += BYTES_BY_CHAR_HEAD (*p); | |
1190 | } | |
1191 | else | |
1192 | { | |
1193 | ch = c; | |
1194 | p++; | |
1195 | } | |
195d1361 RS |
1196 | if (syntaxp) |
1197 | fastmap[syntax_spec_code[c]] = 1; | |
1198 | else | |
1199 | { | |
1200 | if (c == '\\') | |
1201 | { | |
1202 | if (p == pend) break; | |
1203 | c = *p++; | |
1204 | } | |
1205 | if (p != pend && *p == '-') | |
1206 | { | |
7e68b0ea RS |
1207 | unsigned int ch2; |
1208 | ||
195d1361 RS |
1209 | p++; |
1210 | if (p == pend) break; | |
7e68b0ea RS |
1211 | if (SINGLE_BYTE_CHAR_P (ch)) |
1212 | while (c <= *p) | |
1213 | { | |
1214 | fastmap[c] = 1; | |
1215 | c++; | |
1216 | } | |
1217 | else | |
195d1361 | 1218 | { |
7e68b0ea RS |
1219 | fastmap[c] = 1; /* C is the base leading-code. */ |
1220 | ch2 = STRING_CHAR (p, pend - p); | |
1221 | if (ch <= ch2) | |
1222 | char_ranges[n_char_ranges++] = ch, | |
1223 | char_ranges[n_char_ranges++] = ch2; | |
195d1361 | 1224 | } |
7e68b0ea | 1225 | p += multibyte ? BYTES_BY_CHAR_HEAD (*p) : 1; |
195d1361 RS |
1226 | } |
1227 | else | |
7e68b0ea RS |
1228 | { |
1229 | fastmap[c] = 1; | |
1230 | if (!SINGLE_BYTE_CHAR_P (ch)) | |
1231 | { | |
1232 | char_ranges[n_char_ranges++] = ch; | |
1233 | char_ranges[n_char_ranges++] = ch; | |
1234 | } | |
1235 | } | |
195d1361 RS |
1236 | } |
1237 | } | |
1238 | ||
7e68b0ea RS |
1239 | /* If ^ was the first character, complement the fastmap. In |
1240 | addition, as all multibyte characters have possibility of | |
1241 | matching, set all entries for base leading codes, which is | |
1242 | harmless even if SYNTAXP is 1. */ | |
195d1361 RS |
1243 | |
1244 | if (negate) | |
1245 | for (i = 0; i < sizeof fastmap; i++) | |
7e68b0ea RS |
1246 | { |
1247 | if (!multibyte || !BASE_LEADING_CODE_P (i)) | |
1248 | fastmap[i] ^= 1; | |
1249 | else | |
1250 | fastmap[i] = 1; | |
1251 | } | |
195d1361 RS |
1252 | |
1253 | { | |
1254 | int start_point = PT; | |
1255 | int pos = PT; | |
1256 | ||
1257 | immediate_quit = 1; | |
1258 | if (syntaxp) | |
1259 | { | |
1260 | SETUP_SYNTAX_TABLE (pos, forwardp ? 1 : -1); | |
1261 | if (forwardp) | |
1262 | { | |
7e68b0ea | 1263 | if (multibyte) |
195d1361 | 1264 | { |
7e68b0ea RS |
1265 | while (pos < XINT (lim) |
1266 | && fastmap[(int) SYNTAX (FETCH_CHAR (pos))]) | |
1267 | { | |
1268 | INC_POS (pos); | |
1269 | UPDATE_SYNTAX_TABLE_FORWARD (pos); | |
1270 | } | |
1271 | } | |
1272 | else | |
1273 | { | |
1274 | while (pos < XINT (lim) | |
1275 | && fastmap[(int) SYNTAX (FETCH_BYTE (pos))]) | |
1276 | { | |
1277 | pos++; | |
1278 | UPDATE_SYNTAX_TABLE_FORWARD (pos); | |
1279 | } | |
195d1361 RS |
1280 | } |
1281 | } | |
1282 | else | |
1283 | { | |
7e68b0ea | 1284 | if (multibyte) |
195d1361 | 1285 | { |
7e68b0ea RS |
1286 | while (pos > XINT (lim)) |
1287 | { | |
1288 | int savepos = pos; | |
1289 | DEC_POS (pos); | |
4c8535eb | 1290 | UPDATE_SYNTAX_TABLE_BACKWARD (pos); |
7e68b0ea RS |
1291 | if (!fastmap[(int) SYNTAX (FETCH_CHAR (pos))]) |
1292 | { | |
1293 | pos = savepos; | |
1294 | break; | |
1295 | } | |
7e68b0ea RS |
1296 | } |
1297 | } | |
1298 | else | |
1299 | { | |
4c8535eb | 1300 | while (pos > XINT (lim)) |
7e68b0ea RS |
1301 | { |
1302 | pos--; | |
4c8535eb RS |
1303 | UPDATE_SYNTAX_TABLE_BACKWARD (pos); |
1304 | if (!fastmap[(int) SYNTAX (FETCH_BYTE (pos))]) | |
1305 | { | |
1306 | pos++; | |
1307 | break; | |
1308 | } | |
7e68b0ea | 1309 | } |
195d1361 RS |
1310 | } |
1311 | } | |
1312 | } | |
1313 | else | |
1314 | { | |
1315 | if (forwardp) | |
1316 | { | |
7e68b0ea RS |
1317 | if (multibyte) |
1318 | while (pos < XINT (lim) && fastmap[(c = FETCH_BYTE (pos))]) | |
1319 | { | |
1320 | if (!BASE_LEADING_CODE_P (c)) | |
1321 | pos++; | |
1322 | else if (n_char_ranges) | |
1323 | { | |
1324 | /* We much check CHAR_RANGES for a multibyte | |
1325 | character. */ | |
1326 | ch = FETCH_MULTIBYTE_CHAR (pos); | |
1327 | for (i = 0; i < n_char_ranges; i += 2) | |
1328 | if ((ch >= char_ranges[i] && ch <= char_ranges[i + 1])) | |
1329 | break; | |
1330 | if (!(negate ^ (i < n_char_ranges))) | |
1331 | break; | |
1332 | ||
1333 | INC_POS (pos); | |
1334 | } | |
1335 | else | |
1336 | { | |
1337 | if (!negate) break; | |
1338 | INC_POS (pos); | |
1339 | } | |
1340 | } | |
1341 | else | |
1342 | while (pos < XINT (lim) && fastmap[FETCH_BYTE (pos)]) | |
1343 | pos++; | |
195d1361 RS |
1344 | } |
1345 | else | |
1346 | { | |
7e68b0ea RS |
1347 | if (multibyte) |
1348 | while (pos > XINT (lim)) | |
1349 | { | |
1350 | int savepos = pos; | |
1351 | DEC_POS (pos); | |
1352 | if (fastmap[(c = FETCH_BYTE (pos))]) | |
1353 | { | |
1354 | if (!BASE_LEADING_CODE_P (c)) | |
1355 | ; | |
1356 | else if (n_char_ranges) | |
1357 | { | |
1358 | /* We much check CHAR_RANGES for a multibyte | |
1359 | character. */ | |
1360 | ch = FETCH_MULTIBYTE_CHAR (pos); | |
1361 | for (i = 0; i < n_char_ranges; i += 2) | |
1362 | if (ch >= char_ranges[i] && ch <= char_ranges[i + 1]) | |
1363 | break; | |
1364 | if (!(negate ^ (i < n_char_ranges))) | |
1365 | { | |
1366 | pos = savepos; | |
1367 | break; | |
1368 | } | |
1369 | } | |
1370 | else | |
1371 | if (!negate) | |
1372 | { | |
1373 | pos = savepos; | |
1374 | break; | |
1375 | } | |
1376 | } | |
1377 | else | |
1378 | { | |
1379 | pos = savepos; | |
1380 | break; | |
1381 | } | |
1382 | } | |
1383 | else | |
1384 | while (pos > XINT (lim) && fastmap[FETCH_BYTE (pos - 1)]) | |
1385 | pos--; | |
195d1361 RS |
1386 | } |
1387 | } | |
7e68b0ea RS |
1388 | |
1389 | if (multibyte | |
1390 | /* INC_POS or DEC_POS might have moved POS over LIM. */ | |
1391 | && (forwardp ? (pos > XINT (lim)) : (pos < XINT (lim)))) | |
1392 | pos = XINT (lim); | |
1393 | ||
195d1361 RS |
1394 | SET_PT (pos); |
1395 | immediate_quit = 0; | |
1396 | ||
1397 | return make_number (PT - start_point); | |
1398 | } | |
1399 | } | |
1400 | \f | |
b3cfe0c8 RS |
1401 | DEFUN ("forward-comment", Fforward_comment, Sforward_comment, 1, 1, 0, |
1402 | "Move forward across up to N comments. If N is negative, move backward.\n\ | |
b3cfe0c8 | 1403 | Stop scanning if we find something other than a comment or whitespace.\n\ |
c81a3712 | 1404 | Set point to where scanning stops.\n\ |
b3cfe0c8 RS |
1405 | If N comments are found as expected, with nothing except whitespace\n\ |
1406 | between them, return t; otherwise return nil.") | |
1407 | (count) | |
840f481c | 1408 | Lisp_Object count; |
b3cfe0c8 RS |
1409 | { |
1410 | register int from; | |
1411 | register int stop; | |
8ea151b2 | 1412 | register int c, c1; |
b3cfe0c8 RS |
1413 | register enum syntaxcode code; |
1414 | int comstyle = 0; /* style of comment encountered */ | |
be720845 | 1415 | int found; |
840f481c | 1416 | int count1; |
93da5fff | 1417 | int temp_pos; |
840f481c RS |
1418 | |
1419 | CHECK_NUMBER (count, 0); | |
1420 | count1 = XINT (count); | |
195d1361 | 1421 | stop = count1 > 0 ? ZV : BEGV; |
b3cfe0c8 RS |
1422 | |
1423 | immediate_quit = 1; | |
1424 | QUIT; | |
1425 | ||
1426 | from = PT; | |
1427 | ||
195d1361 | 1428 | SETUP_SYNTAX_TABLE (from, count1); |
840f481c | 1429 | while (count1 > 0) |
b3cfe0c8 | 1430 | { |
04882296 | 1431 | do |
b3cfe0c8 | 1432 | { |
04882296 KH |
1433 | if (from == stop) |
1434 | { | |
1435 | SET_PT (from); | |
b7e6e612 | 1436 | immediate_quit = 0; |
04882296 KH |
1437 | return Qnil; |
1438 | } | |
195d1361 | 1439 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
b3cfe0c8 RS |
1440 | c = FETCH_CHAR (from); |
1441 | code = SYNTAX (c); | |
93da5fff | 1442 | INC_POS (from); |
b3cfe0c8 RS |
1443 | comstyle = 0; |
1444 | if (from < stop && SYNTAX_COMSTART_FIRST (c) | |
8ea151b2 RS |
1445 | && (c1 = FETCH_CHAR (from), |
1446 | SYNTAX_COMSTART_SECOND (c1))) | |
b3cfe0c8 | 1447 | { |
7fc8191e RS |
1448 | /* We have encountered a comment start sequence and we |
1449 | are ignoring all text inside comments. We must record | |
b3cfe0c8 RS |
1450 | the comment style this sequence begins so that later, |
1451 | only a comment end of the same style actually ends | |
7fc8191e | 1452 | the comment section. */ |
b3cfe0c8 | 1453 | code = Scomment; |
8ea151b2 | 1454 | comstyle = SYNTAX_COMMENT_STYLE (c1); |
93da5fff | 1455 | INC_POS (from); |
b3cfe0c8 | 1456 | } |
04882296 KH |
1457 | } |
1458 | while (code == Swhitespace || code == Sendcomment); | |
195d1361 | 1459 | if (code != Scomment && code != Scomment_fence) |
04882296 KH |
1460 | { |
1461 | immediate_quit = 0; | |
93da5fff KH |
1462 | DEC_POS (from); |
1463 | SET_PT (from); | |
04882296 KH |
1464 | return Qnil; |
1465 | } | |
1466 | /* We're at the start of a comment. */ | |
1467 | while (1) | |
1468 | { | |
1469 | if (from == stop) | |
b3cfe0c8 RS |
1470 | { |
1471 | immediate_quit = 0; | |
04882296 | 1472 | SET_PT (from); |
b3cfe0c8 RS |
1473 | return Qnil; |
1474 | } | |
195d1361 | 1475 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
04882296 | 1476 | c = FETCH_CHAR (from); |
93da5fff | 1477 | INC_POS (from); |
04882296 KH |
1478 | if (SYNTAX (c) == Sendcomment |
1479 | && SYNTAX_COMMENT_STYLE (c) == comstyle) | |
1480 | /* we have encountered a comment end of the same style | |
1481 | as the comment sequence which began this comment | |
1482 | section */ | |
1483 | break; | |
195d1361 RS |
1484 | if (SYNTAX (c) == Scomment_fence |
1485 | && comstyle == ST_COMMENT_STYLE) | |
1486 | /* we have encountered a comment end of the same style | |
1487 | as the comment sequence which began this comment | |
1488 | section. */ | |
1489 | break; | |
04882296 | 1490 | if (from < stop && SYNTAX_COMEND_FIRST (c) |
8ea151b2 RS |
1491 | && (c1 = FETCH_CHAR (from), |
1492 | SYNTAX_COMEND_SECOND (c1)) | |
04882296 KH |
1493 | && SYNTAX_COMMENT_STYLE (c) == comstyle) |
1494 | /* we have encountered a comment end of the same style | |
1495 | as the comment sequence which began this comment | |
1496 | section */ | |
93da5fff | 1497 | { INC_POS (from); break; } |
b3cfe0c8 | 1498 | } |
04882296 | 1499 | /* We have skipped one comment. */ |
840f481c | 1500 | count1--; |
b3cfe0c8 RS |
1501 | } |
1502 | ||
840f481c | 1503 | while (count1 < 0) |
b3cfe0c8 | 1504 | { |
b9145dbb | 1505 | while (1) |
b3cfe0c8 RS |
1506 | { |
1507 | int quoted; | |
b9145dbb RS |
1508 | if (from <= stop) |
1509 | { | |
1510 | SET_PT (stop); | |
1511 | immediate_quit = 0; | |
1512 | return Qnil; | |
1513 | } | |
b3cfe0c8 | 1514 | |
93da5fff | 1515 | DEC_POS (from); |
b3cfe0c8 RS |
1516 | quoted = char_quoted (from); |
1517 | if (quoted) | |
195d1361 RS |
1518 | { |
1519 | DEC_POS (from); | |
1520 | goto leave; /* ????? XXXXX */ | |
1521 | } | |
1522 | UPDATE_SYNTAX_TABLE_BACKWARD (from); | |
b3cfe0c8 RS |
1523 | c = FETCH_CHAR (from); |
1524 | code = SYNTAX (c); | |
1525 | comstyle = 0; | |
7fc8191e RS |
1526 | if (code == Sendcomment) |
1527 | comstyle = SYNTAX_COMMENT_STYLE (c); | |
93da5fff KH |
1528 | temp_pos = from; |
1529 | DEC_POS (temp_pos); | |
b3cfe0c8 | 1530 | if (from > stop && SYNTAX_COMEND_SECOND (c) |
93da5fff | 1531 | && (c1 = FETCH_CHAR (temp_pos), |
8ea151b2 | 1532 | SYNTAX_COMEND_FIRST (c1)) |
93da5fff | 1533 | && !char_quoted (temp_pos)) |
b3cfe0c8 | 1534 | { |
7fc8191e | 1535 | /* We must record the comment style encountered so that |
b3cfe0c8 | 1536 | later, we can match only the proper comment begin |
7fc8191e | 1537 | sequence of the same style. */ |
b3cfe0c8 | 1538 | code = Sendcomment; |
8ea151b2 | 1539 | comstyle = SYNTAX_COMMENT_STYLE (c1); |
93da5fff | 1540 | from = temp_pos; |
b3cfe0c8 | 1541 | } |
ae03af34 RS |
1542 | if (from > stop && SYNTAX_COMSTART_SECOND (c) |
1543 | && (c1 = FETCH_CHAR (temp_pos), | |
1544 | SYNTAX_COMSTART_FIRST (c1)) | |
1545 | && !char_quoted (temp_pos)) | |
1546 | { | |
1547 | /* We must record the comment style encountered so that | |
1548 | later, we can match only the proper comment begin | |
1549 | sequence of the same style. */ | |
1550 | code = Scomment; | |
1551 | from = temp_pos; | |
1552 | } | |
b3cfe0c8 | 1553 | |
195d1361 RS |
1554 | if (code == Scomment_fence) |
1555 | { | |
1556 | /* Skip until first preceding unquoted comment_fence. */ | |
1557 | int found = 0, ini = from; | |
1558 | ||
1559 | while (--from != stop) | |
1560 | { | |
1561 | UPDATE_SYNTAX_TABLE_BACKWARD (from); | |
1562 | c = FETCH_CHAR (from); | |
1563 | if (SYNTAX (c) == Scomment_fence && !char_quoted (from)) | |
1564 | { | |
1565 | found = 1; | |
1566 | break; | |
1567 | } | |
1568 | } | |
1569 | if (found == 0) | |
1570 | { | |
1571 | from = ini; /* Set point to ini + 1. */ | |
1572 | goto leave; | |
1573 | } | |
1574 | } | |
1575 | else if (code == Sendcomment) | |
b3cfe0c8 | 1576 | { |
8f9dc2ed | 1577 | #if 0 |
b3cfe0c8 RS |
1578 | if (code != SYNTAX (c)) |
1579 | /* For a two-char comment ender, we can assume | |
1580 | it does end a comment. So scan back in a simple way. */ | |
1581 | { | |
93da5fff | 1582 | if (from != stop) DEC_POS (from); |
b3cfe0c8 RS |
1583 | while (1) |
1584 | { | |
8ea151b2 RS |
1585 | if ((c = FETCH_CHAR (from), |
1586 | SYNTAX (c) == Scomment) | |
b3cfe0c8 RS |
1587 | && SYNTAX_COMMENT_STYLE (c) == comstyle) |
1588 | break; | |
1589 | if (from == stop) | |
1590 | { | |
1591 | immediate_quit = 0; | |
c81a3712 | 1592 | SET_PT (from); |
b3cfe0c8 RS |
1593 | return Qnil; |
1594 | } | |
93da5fff | 1595 | DEC_POS (from); |
b3cfe0c8 | 1596 | if (SYNTAX_COMSTART_SECOND (c) |
8ea151b2 RS |
1597 | && (c1 = FETCH_CHAR (from), |
1598 | SYNTAX_COMSTART_FIRST (c1)) | |
b3cfe0c8 RS |
1599 | && SYNTAX_COMMENT_STYLE (c) == comstyle |
1600 | && !char_quoted (from)) | |
1601 | break; | |
1602 | } | |
1603 | break; | |
1604 | } | |
8f9dc2ed | 1605 | #endif /* 0 */ |
ea315ed6 | 1606 | found = back_comment (from, stop, comstyle); |
195d1361 RS |
1607 | if (found != -1) from = found; |
1608 | #if 0 | |
b3cfe0c8 RS |
1609 | /* Look back, counting the parity of string-quotes, |
1610 | and recording the comment-starters seen. | |
1611 | When we reach a safe place, assume that's not in a string; | |
1612 | then step the main scan to the earliest comment-starter seen | |
1613 | an even number of string quotes away from the safe place. | |
1614 | ||
1615 | OFROM[I] is position of the earliest comment-starter seen | |
1616 | which is I+2X quotes from the comment-end. | |
1617 | PARITY is current parity of quotes from the comment end. */ | |
1618 | { | |
1619 | int parity = 0; | |
1620 | char my_stringend = 0; | |
1621 | int string_lossage = 0; | |
1622 | int comment_end = from; | |
1623 | int comstart_pos = 0; | |
1624 | int comstart_parity = 0; | |
93da5fff | 1625 | int scanstart = from; |
b3cfe0c8 | 1626 | |
93da5fff | 1627 | DEC_POS (scanstart); |
b3cfe0c8 RS |
1628 | /* At beginning of range to scan, we're outside of strings; |
1629 | that determines quote parity to the comment-end. */ | |
1630 | while (from != stop) | |
1631 | { | |
1632 | /* Move back and examine a character. */ | |
93da5fff | 1633 | DEC_POS (from); |
b3cfe0c8 | 1634 | |
195d1361 | 1635 | UPDATE_SYNTAX_TABLE_BACKWARD (from); |
b3cfe0c8 RS |
1636 | c = FETCH_CHAR (from); |
1637 | code = SYNTAX (c); | |
1638 | ||
1639 | /* If this char is the second of a 2-char comment sequence, | |
1640 | back up and give the pair the appropriate syntax. */ | |
93da5fff KH |
1641 | temp_pos = from; |
1642 | DEC_POS (temp_pos); | |
b3cfe0c8 | 1643 | if (from > stop && SYNTAX_COMEND_SECOND (c) |
93da5fff KH |
1644 | && (c1 = FETCH_CHAR (temp_pos), |
1645 | SYNTAX_COMEND_FIRST (c1))) | |
b3cfe0c8 RS |
1646 | { |
1647 | code = Sendcomment; | |
93da5fff KH |
1648 | from = temp_pos; |
1649 | c = c1; | |
b3cfe0c8 RS |
1650 | } |
1651 | ||
93da5fff KH |
1652 | temp_pos = from; |
1653 | INC_POS (temp_pos); | |
4841063f RS |
1654 | /* If this char starts a 2-char comment start sequence, |
1655 | treat it like a 1-char comment starter. */ | |
1656 | if (from < scanstart && SYNTAX_COMSTART_FIRST (c) | |
93da5fff KH |
1657 | && (c1 = FETCH_CHAR (temp_pos), |
1658 | SYNTAX_COMSTART_SECOND (c1)) | |
1659 | && comstyle == SYNTAX_COMMENT_STYLE (c1)) | |
4841063f | 1660 | code = Scomment; |
b3cfe0c8 RS |
1661 | |
1662 | /* Ignore escaped characters. */ | |
1663 | if (char_quoted (from)) | |
1664 | continue; | |
1665 | ||
1666 | /* Track parity of quotes. */ | |
1667 | if (code == Sstring) | |
1668 | { | |
1669 | parity ^= 1; | |
1670 | if (my_stringend == 0) | |
1671 | my_stringend = c; | |
1672 | /* If we have two kinds of string delimiters. | |
1673 | There's no way to grok this scanning backwards. */ | |
1674 | else if (my_stringend != c) | |
1675 | string_lossage = 1; | |
1676 | } | |
1677 | ||
1678 | /* Record comment-starters according to that | |
1679 | quote-parity to the comment-end. */ | |
1680 | if (code == Scomment) | |
1681 | { | |
1682 | comstart_parity = parity; | |
1683 | comstart_pos = from; | |
1684 | } | |
1685 | ||
1686 | /* If we find another earlier comment-ender, | |
eb8c3be9 | 1687 | any comment-starts earlier than that don't count |
b3cfe0c8 RS |
1688 | (because they go with the earlier comment-ender). */ |
1689 | if (code == Sendcomment | |
1690 | && SYNTAX_COMMENT_STYLE (FETCH_CHAR (from)) == comstyle) | |
1691 | break; | |
1692 | ||
1693 | /* Assume a defun-start point is outside of strings. */ | |
1694 | if (code == Sopen | |
93da5fff | 1695 | && (from == stop || FETCH_BYTE (from - 1) == '\n')) |
b3cfe0c8 RS |
1696 | break; |
1697 | } | |
1698 | ||
1699 | if (comstart_pos == 0) | |
1700 | from = comment_end; | |
1701 | /* If the earliest comment starter | |
1702 | is followed by uniform paired string quotes or none, | |
1703 | we know it can't be inside a string | |
1704 | since if it were then the comment ender would be inside one. | |
1705 | So it does start a comment. Skip back to it. */ | |
1706 | else if (comstart_parity == 0 && !string_lossage) | |
1707 | from = comstart_pos; | |
1708 | else | |
1709 | { | |
1710 | /* We had two kinds of string delimiters mixed up | |
1711 | together. Decode this going forwards. | |
1712 | Scan fwd from the previous comment ender | |
1713 | to the one in question; this records where we | |
1714 | last passed a comment starter. */ | |
1715 | struct lisp_parse_state state; | |
1716 | scan_sexps_forward (&state, find_defun_start (comment_end), | |
340f92b5 | 1717 | comment_end - 1, -10000, 0, Qnil, 0); |
b3cfe0c8 | 1718 | if (state.incomment) |
195d1361 | 1719 | from = state.comstr_start; |
b3cfe0c8 RS |
1720 | else |
1721 | /* We can't grok this as a comment; scan it normally. */ | |
1722 | from = comment_end; | |
1723 | } | |
1724 | } | |
195d1361 | 1725 | #endif /* 0 */ |
7fc8191e RS |
1726 | /* We have skipped one comment. */ |
1727 | break; | |
b3cfe0c8 | 1728 | } |
195d1361 | 1729 | else if (code != Swhitespace && code != Scomment) |
b3cfe0c8 | 1730 | { |
195d1361 | 1731 | leave: |
b3cfe0c8 | 1732 | immediate_quit = 0; |
93da5fff KH |
1733 | INC_POS (from); |
1734 | SET_PT (from); | |
b3cfe0c8 RS |
1735 | return Qnil; |
1736 | } | |
1737 | } | |
1738 | ||
840f481c | 1739 | count1++; |
b3cfe0c8 RS |
1740 | } |
1741 | ||
1742 | SET_PT (from); | |
1743 | immediate_quit = 0; | |
1744 | return Qt; | |
1745 | } | |
1746 | \f | |
8489eb67 RS |
1747 | Lisp_Object |
1748 | scan_lists (from, count, depth, sexpflag) | |
1749 | register int from; | |
1750 | int count, depth, sexpflag; | |
1751 | { | |
1752 | Lisp_Object val; | |
195d1361 | 1753 | register int stop = count > 0 ? ZV : BEGV; |
93da5fff KH |
1754 | register int c, c1; |
1755 | int stringterm; | |
8489eb67 RS |
1756 | int quoted; |
1757 | int mathexit = 0; | |
93da5fff | 1758 | register enum syntaxcode code, temp_code; |
195d1361 | 1759 | int min_depth = depth; /* Err out if depth gets less than this. */ |
e5d4f4dc | 1760 | int comstyle = 0; /* style of comment encountered */ |
93da5fff | 1761 | int temp_pos; |
7bf5e9e4 | 1762 | int last_good = from; |
195d1361 | 1763 | int found; |
8489eb67 RS |
1764 | |
1765 | if (depth > 0) min_depth = 0; | |
1766 | ||
1767 | immediate_quit = 1; | |
1768 | QUIT; | |
1769 | ||
195d1361 | 1770 | SETUP_SYNTAX_TABLE (from, count); |
8489eb67 RS |
1771 | while (count > 0) |
1772 | { | |
8489eb67 RS |
1773 | while (from < stop) |
1774 | { | |
195d1361 | 1775 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
8489eb67 | 1776 | c = FETCH_CHAR (from); |
e5d4f4dc | 1777 | code = SYNTAX (c); |
7bf5e9e4 RS |
1778 | if (depth == min_depth) |
1779 | last_good = from; | |
93da5fff | 1780 | INC_POS (from); |
195d1361 | 1781 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
8489eb67 RS |
1782 | if (from < stop && SYNTAX_COMSTART_FIRST (c) |
1783 | && SYNTAX_COMSTART_SECOND (FETCH_CHAR (from)) | |
1784 | && parse_sexp_ignore_comments) | |
e5d4f4dc RS |
1785 | { |
1786 | /* we have encountered a comment start sequence and we | |
195d1361 | 1787 | are ignoring all text inside comments. We must record |
e5d4f4dc RS |
1788 | the comment style this sequence begins so that later, |
1789 | only a comment end of the same style actually ends | |
1790 | the comment section */ | |
1791 | code = Scomment; | |
1792 | comstyle = SYNTAX_COMMENT_STYLE (FETCH_CHAR (from)); | |
93da5fff | 1793 | INC_POS (from); |
e5d4f4dc RS |
1794 | } |
1795 | ||
195d1361 | 1796 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
8489eb67 RS |
1797 | if (SYNTAX_PREFIX (c)) |
1798 | continue; | |
1799 | ||
0220c518 | 1800 | switch (SWITCH_ENUM_CAST (code)) |
8489eb67 RS |
1801 | { |
1802 | case Sescape: | |
1803 | case Scharquote: | |
1804 | if (from == stop) goto lose; | |
93da5fff | 1805 | INC_POS (from); |
8489eb67 RS |
1806 | /* treat following character as a word constituent */ |
1807 | case Sword: | |
1808 | case Ssymbol: | |
1809 | if (depth || !sexpflag) break; | |
195d1361 | 1810 | /* This word counts as a sexp; return at end of it. */ |
8489eb67 RS |
1811 | while (from < stop) |
1812 | { | |
195d1361 | 1813 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
0220c518 | 1814 | switch (SWITCH_ENUM_CAST (SYNTAX (FETCH_CHAR (from)))) |
8489eb67 RS |
1815 | { |
1816 | case Scharquote: | |
1817 | case Sescape: | |
93da5fff | 1818 | INC_POS (from); |
8489eb67 RS |
1819 | if (from == stop) goto lose; |
1820 | break; | |
1821 | case Sword: | |
1822 | case Ssymbol: | |
1823 | case Squote: | |
1824 | break; | |
1825 | default: | |
1826 | goto done; | |
1827 | } | |
93da5fff | 1828 | INC_POS (from); |
8489eb67 RS |
1829 | } |
1830 | goto done; | |
1831 | ||
1832 | case Scomment: | |
195d1361 | 1833 | case Scomment_fence: |
8489eb67 RS |
1834 | if (!parse_sexp_ignore_comments) break; |
1835 | while (1) | |
1836 | { | |
c01f7ec0 RS |
1837 | if (from == stop) |
1838 | { | |
1839 | if (depth == 0) | |
1840 | goto done; | |
1841 | goto lose; | |
1842 | } | |
195d1361 | 1843 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
e5d4f4dc | 1844 | c = FETCH_CHAR (from); |
195d1361 RS |
1845 | if (code == Scomment |
1846 | ? (SYNTAX (c) == Sendcomment | |
1847 | && SYNTAX_COMMENT_STYLE (c) == comstyle) | |
1848 | : (SYNTAX (c) == Scomment_fence)) | |
e5d4f4dc RS |
1849 | /* we have encountered a comment end of the same style |
1850 | as the comment sequence which began this comment | |
1851 | section */ | |
8489eb67 | 1852 | break; |
93da5fff | 1853 | INC_POS (from); |
8489eb67 | 1854 | if (from < stop && SYNTAX_COMEND_FIRST (c) |
e5d4f4dc | 1855 | && SYNTAX_COMEND_SECOND (FETCH_CHAR (from)) |
195d1361 RS |
1856 | && SYNTAX_COMMENT_STYLE (c) == comstyle |
1857 | && code == Scomment) | |
e5d4f4dc RS |
1858 | /* we have encountered a comment end of the same style |
1859 | as the comment sequence which began this comment | |
1860 | section */ | |
93da5fff | 1861 | { INC_POS (from); break; } |
8489eb67 RS |
1862 | } |
1863 | break; | |
1864 | ||
1865 | case Smath: | |
1866 | if (!sexpflag) | |
1867 | break; | |
1868 | if (from != stop && c == FETCH_CHAR (from)) | |
93da5fff | 1869 | INC_POS (from); |
8489eb67 RS |
1870 | if (mathexit) |
1871 | { | |
1872 | mathexit = 0; | |
1873 | goto close1; | |
1874 | } | |
1875 | mathexit = 1; | |
1876 | ||
1877 | case Sopen: | |
1878 | if (!++depth) goto done; | |
1879 | break; | |
1880 | ||
1881 | case Sclose: | |
1882 | close1: | |
1883 | if (!--depth) goto done; | |
1884 | if (depth < min_depth) | |
7bf5e9e4 RS |
1885 | Fsignal (Qscan_error, |
1886 | Fcons (build_string ("Containing expression ends prematurely"), | |
1887 | Fcons (make_number (last_good), | |
1888 | Fcons (make_number (from), Qnil)))); | |
8489eb67 RS |
1889 | break; |
1890 | ||
1891 | case Sstring: | |
195d1361 | 1892 | case Sstring_fence: |
93da5fff KH |
1893 | temp_pos = from; |
1894 | DEC_POS (temp_pos); | |
1895 | stringterm = FETCH_CHAR (temp_pos); | |
8489eb67 RS |
1896 | while (1) |
1897 | { | |
1898 | if (from >= stop) goto lose; | |
195d1361 RS |
1899 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
1900 | if (code == Sstring | |
1901 | ? (FETCH_CHAR (from) == stringterm) | |
1902 | : SYNTAX (FETCH_CHAR (from)) == Sstring_fence) | |
1903 | break; | |
0220c518 | 1904 | switch (SWITCH_ENUM_CAST (SYNTAX (FETCH_CHAR (from)))) |
8489eb67 RS |
1905 | { |
1906 | case Scharquote: | |
1907 | case Sescape: | |
93da5fff | 1908 | INC_POS (from); |
8489eb67 | 1909 | } |
93da5fff | 1910 | INC_POS (from); |
8489eb67 | 1911 | } |
93da5fff | 1912 | INC_POS (from); |
8489eb67 RS |
1913 | if (!depth && sexpflag) goto done; |
1914 | break; | |
1915 | } | |
1916 | } | |
1917 | ||
1918 | /* Reached end of buffer. Error if within object, return nil if between */ | |
1919 | if (depth) goto lose; | |
1920 | ||
1921 | immediate_quit = 0; | |
1922 | return Qnil; | |
1923 | ||
1924 | /* End of object reached */ | |
1925 | done: | |
1926 | count--; | |
1927 | } | |
1928 | ||
1929 | while (count < 0) | |
1930 | { | |
8489eb67 RS |
1931 | while (from > stop) |
1932 | { | |
93da5fff | 1933 | DEC_POS (from); |
195d1361 | 1934 | UPDATE_SYNTAX_TABLE_BACKWARD (from); |
8489eb67 | 1935 | if (quoted = char_quoted (from)) |
195d1361 RS |
1936 | { |
1937 | DEC_POS (from); | |
1938 | UPDATE_SYNTAX_TABLE_BACKWARD (from); | |
1939 | } | |
8489eb67 RS |
1940 | c = FETCH_CHAR (from); |
1941 | code = SYNTAX (c); | |
7bf5e9e4 RS |
1942 | if (depth == min_depth) |
1943 | last_good = from; | |
7fc8191e RS |
1944 | comstyle = 0; |
1945 | if (code == Sendcomment) | |
1946 | comstyle = SYNTAX_COMMENT_STYLE (c); | |
93da5fff KH |
1947 | temp_pos = from; |
1948 | DEC_POS (temp_pos); | |
8489eb67 | 1949 | if (from > stop && SYNTAX_COMEND_SECOND (c) |
93da5fff KH |
1950 | && (c1 = FETCH_CHAR (temp_pos), SYNTAX_COMEND_FIRST (c1)) |
1951 | && !char_quoted (temp_pos) | |
8489eb67 | 1952 | && parse_sexp_ignore_comments) |
e5d4f4dc RS |
1953 | { |
1954 | /* we must record the comment style encountered so that | |
1955 | later, we can match only the proper comment begin | |
1956 | sequence of the same style */ | |
1957 | code = Sendcomment; | |
93da5fff KH |
1958 | comstyle = SYNTAX_COMMENT_STYLE (c1); |
1959 | from = temp_pos; | |
e5d4f4dc RS |
1960 | } |
1961 | ||
8489eb67 RS |
1962 | if (SYNTAX_PREFIX (c)) |
1963 | continue; | |
1964 | ||
0220c518 | 1965 | switch (SWITCH_ENUM_CAST (quoted ? Sword : code)) |
8489eb67 RS |
1966 | { |
1967 | case Sword: | |
1968 | case Ssymbol: | |
1969 | if (depth || !sexpflag) break; | |
195d1361 RS |
1970 | /* This word counts as a sexp; count object finished |
1971 | after passing it. */ | |
8489eb67 RS |
1972 | while (from > stop) |
1973 | { | |
93da5fff KH |
1974 | temp_pos = from; |
1975 | DEC_POS (temp_pos); | |
195d1361 | 1976 | UPDATE_SYNTAX_TABLE_BACKWARD (temp_pos); |
93da5fff | 1977 | quoted = char_quoted (temp_pos); |
8489eb67 | 1978 | if (quoted) |
93da5fff KH |
1979 | { |
1980 | from = temp_pos; | |
1981 | DEC_POS (temp_pos); | |
195d1361 | 1982 | UPDATE_SYNTAX_TABLE_BACKWARD (temp_pos); |
93da5fff KH |
1983 | } |
1984 | c1 = FETCH_CHAR (temp_pos); | |
1985 | temp_code = SYNTAX (c1); | |
1986 | if (! (quoted || temp_code == Sword | |
1987 | || temp_code == Ssymbol | |
1988 | || temp_code == Squote)) | |
8489eb67 | 1989 | goto done2; |
93da5fff | 1990 | from = temp_pos; |
8489eb67 RS |
1991 | } |
1992 | goto done2; | |
1993 | ||
1994 | case Smath: | |
1995 | if (!sexpflag) | |
1996 | break; | |
93da5fff KH |
1997 | temp_pos = from; |
1998 | DEC_POS (temp_pos); | |
195d1361 | 1999 | UPDATE_SYNTAX_TABLE_BACKWARD (temp_pos); |
93da5fff KH |
2000 | if (from != stop && c == FETCH_CHAR (temp_pos)) |
2001 | from = temp_pos; | |
8489eb67 RS |
2002 | if (mathexit) |
2003 | { | |
2004 | mathexit = 0; | |
2005 | goto open2; | |
2006 | } | |
2007 | mathexit = 1; | |
2008 | ||
2009 | case Sclose: | |
2010 | if (!++depth) goto done2; | |
2011 | break; | |
2012 | ||
2013 | case Sopen: | |
2014 | open2: | |
2015 | if (!--depth) goto done2; | |
2016 | if (depth < min_depth) | |
7bf5e9e4 RS |
2017 | Fsignal (Qscan_error, |
2018 | Fcons (build_string ("Containing expression ends prematurely"), | |
2019 | Fcons (make_number (last_good), | |
2020 | Fcons (make_number (from), Qnil)))); | |
8489eb67 RS |
2021 | break; |
2022 | ||
2023 | case Sendcomment: | |
2024 | if (!parse_sexp_ignore_comments) | |
2025 | break; | |
8f9dc2ed | 2026 | #if 0 |
37bef230 RS |
2027 | if (code != SYNTAX (c)) |
2028 | /* For a two-char comment ender, we can assume | |
2029 | it does end a comment. So scan back in a simple way. */ | |
2030 | { | |
93da5fff | 2031 | if (from != stop) DEC_POS (from); |
37bef230 RS |
2032 | while (1) |
2033 | { | |
2034 | if (SYNTAX (c = FETCH_CHAR (from)) == Scomment | |
2035 | && SYNTAX_COMMENT_STYLE (c) == comstyle) | |
2036 | break; | |
c01f7ec0 RS |
2037 | if (from == stop) |
2038 | { | |
2039 | if (depth == 0) | |
2040 | goto done2; | |
2041 | goto lose; | |
2042 | } | |
93da5fff | 2043 | DEC_POS (from); |
37bef230 RS |
2044 | if (SYNTAX_COMSTART_SECOND (c) |
2045 | && SYNTAX_COMSTART_FIRST (FETCH_CHAR (from)) | |
2046 | && SYNTAX_COMMENT_STYLE (c) == comstyle | |
2047 | && !char_quoted (from)) | |
2048 | break; | |
2049 | } | |
2050 | break; | |
2051 | } | |
8f9dc2ed | 2052 | #endif /* 0 */ |
ea315ed6 | 2053 | found = back_comment (from, stop, comstyle); |
195d1361 RS |
2054 | if (found != -1) from = found; |
2055 | #if 0 | |
8489eb67 RS |
2056 | /* Look back, counting the parity of string-quotes, |
2057 | and recording the comment-starters seen. | |
2058 | When we reach a safe place, assume that's not in a string; | |
2059 | then step the main scan to the earliest comment-starter seen | |
2060 | an even number of string quotes away from the safe place. | |
2061 | ||
2062 | OFROM[I] is position of the earliest comment-starter seen | |
2063 | which is I+2X quotes from the comment-end. | |
2064 | PARITY is current parity of quotes from the comment end. */ | |
2065 | { | |
8489eb67 | 2066 | int parity = 0; |
e5d4f4dc RS |
2067 | char my_stringend = 0; |
2068 | int string_lossage = 0; | |
2069 | int comment_end = from; | |
37bef230 RS |
2070 | int comstart_pos = 0; |
2071 | int comstart_parity = 0; | |
93da5fff KH |
2072 | int scanstart = from; |
2073 | ||
2074 | DEC_POS (scanstart); | |
8489eb67 RS |
2075 | |
2076 | /* At beginning of range to scan, we're outside of strings; | |
2077 | that determines quote parity to the comment-end. */ | |
2078 | while (from != stop) | |
2079 | { | |
2080 | /* Move back and examine a character. */ | |
93da5fff | 2081 | DEC_POS (from); |
8489eb67 RS |
2082 | |
2083 | c = FETCH_CHAR (from); | |
2084 | code = SYNTAX (c); | |
2085 | ||
2086 | /* If this char is the second of a 2-char comment sequence, | |
2087 | back up and give the pair the appropriate syntax. */ | |
93da5fff KH |
2088 | temp_pos = from; |
2089 | DEC_POS (temp_pos); | |
8489eb67 | 2090 | if (from > stop && SYNTAX_COMEND_SECOND (c) |
93da5fff KH |
2091 | && (c1 = FETCH_CHAR (temp_pos), |
2092 | SYNTAX_COMEND_FIRST (c1))) | |
e5d4f4dc RS |
2093 | { |
2094 | code = Sendcomment; | |
93da5fff KH |
2095 | from = temp_pos; |
2096 | c = c1; | |
e5d4f4dc RS |
2097 | } |
2098 | ||
4841063f RS |
2099 | /* If this char starts a 2-char comment start sequence, |
2100 | treat it like a 1-char comment starter. */ | |
93da5fff KH |
2101 | temp_pos = from; |
2102 | INC_POS (temp_pos); | |
4841063f | 2103 | if (from < scanstart && SYNTAX_COMSTART_FIRST (c) |
93da5fff KH |
2104 | && (c1 = FETCH_CHAR (temp_pos), |
2105 | SYNTAX_COMSTART_SECOND (c1)) | |
2106 | && comstyle == SYNTAX_COMMENT_STYLE (c1)) | |
4841063f | 2107 | code = Scomment; |
8489eb67 RS |
2108 | |
2109 | /* Ignore escaped characters. */ | |
2110 | if (char_quoted (from)) | |
2111 | continue; | |
2112 | ||
37bef230 | 2113 | /* Track parity of quotes. */ |
8489eb67 | 2114 | if (code == Sstring) |
e5d4f4dc RS |
2115 | { |
2116 | parity ^= 1; | |
2117 | if (my_stringend == 0) | |
2118 | my_stringend = c; | |
37bef230 | 2119 | /* If we have two kinds of string delimiters. |
e5d4f4dc RS |
2120 | There's no way to grok this scanning backwards. */ |
2121 | else if (my_stringend != c) | |
2122 | string_lossage = 1; | |
2123 | } | |
8489eb67 RS |
2124 | |
2125 | /* Record comment-starters according to that | |
2126 | quote-parity to the comment-end. */ | |
2127 | if (code == Scomment) | |
37bef230 RS |
2128 | { |
2129 | comstart_parity = parity; | |
2130 | comstart_pos = from; | |
2131 | } | |
8489eb67 | 2132 | |
37bef230 | 2133 | /* If we find another earlier comment-ender, |
eb8c3be9 | 2134 | any comment-starts earlier than that don't count |
37bef230 | 2135 | (because they go with the earlier comment-ender). */ |
e5d4f4dc RS |
2136 | if (code == Sendcomment |
2137 | && SYNTAX_COMMENT_STYLE (FETCH_CHAR (from)) == comstyle) | |
8489eb67 | 2138 | break; |
37bef230 RS |
2139 | |
2140 | /* Assume a defun-start point is outside of strings. */ | |
2141 | if (code == Sopen | |
93da5fff | 2142 | && (from == stop || FETCH_BYTE (from - 1) == '\n')) |
37bef230 | 2143 | break; |
8489eb67 | 2144 | } |
37bef230 RS |
2145 | |
2146 | if (comstart_pos == 0) | |
2147 | from = comment_end; | |
2148 | /* If the earliest comment starter | |
2149 | is followed by uniform paired string quotes or none, | |
2150 | we know it can't be inside a string | |
2151 | since if it were then the comment ender would be inside one. | |
2152 | So it does start a comment. Skip back to it. */ | |
2153 | else if (comstart_parity == 0 && !string_lossage) | |
2154 | from = comstart_pos; | |
2155 | else | |
e5d4f4dc RS |
2156 | { |
2157 | /* We had two kinds of string delimiters mixed up | |
2158 | together. Decode this going forwards. | |
2159 | Scan fwd from the previous comment ender | |
2160 | to the one in question; this records where we | |
2161 | last passed a comment starter. */ | |
2162 | struct lisp_parse_state state; | |
37bef230 | 2163 | scan_sexps_forward (&state, find_defun_start (comment_end), |
340f92b5 | 2164 | comment_end - 1, -10000, 0, Qnil, 0); |
e5d4f4dc | 2165 | if (state.incomment) |
195d1361 | 2166 | from = state.comstr_start; |
e5d4f4dc RS |
2167 | else |
2168 | /* We can't grok this as a comment; scan it normally. */ | |
2169 | from = comment_end; | |
2170 | } | |
8489eb67 | 2171 | } |
195d1361 | 2172 | #endif /* 0 */ |
8489eb67 RS |
2173 | break; |
2174 | ||
195d1361 RS |
2175 | case Scomment_fence: |
2176 | case Sstring_fence: | |
2177 | while (1) | |
2178 | { | |
2179 | DEC_POS (from); | |
2180 | if (from == stop) goto lose; | |
2181 | UPDATE_SYNTAX_TABLE_BACKWARD (from); | |
2182 | if (!char_quoted (from) | |
2183 | && SYNTAX (FETCH_CHAR (from)) == code) | |
2184 | break; | |
2185 | } | |
2186 | if (code == Sstring_fence && !depth && sexpflag) goto done2; | |
2187 | break; | |
2188 | ||
8489eb67 RS |
2189 | case Sstring: |
2190 | stringterm = FETCH_CHAR (from); | |
2191 | while (1) | |
2192 | { | |
2193 | if (from == stop) goto lose; | |
93da5fff KH |
2194 | temp_pos = from; |
2195 | DEC_POS (temp_pos); | |
195d1361 | 2196 | UPDATE_SYNTAX_TABLE_BACKWARD (temp_pos); |
93da5fff KH |
2197 | if (!char_quoted (temp_pos) |
2198 | && stringterm == FETCH_CHAR (temp_pos)) | |
8489eb67 | 2199 | break; |
93da5fff | 2200 | from = temp_pos; |
8489eb67 | 2201 | } |
93da5fff | 2202 | DEC_POS (from); |
8489eb67 RS |
2203 | if (!depth && sexpflag) goto done2; |
2204 | break; | |
2205 | } | |
2206 | } | |
2207 | ||
2208 | /* Reached start of buffer. Error if within object, return nil if between */ | |
2209 | if (depth) goto lose; | |
2210 | ||
2211 | immediate_quit = 0; | |
2212 | return Qnil; | |
2213 | ||
2214 | done2: | |
2215 | count++; | |
2216 | } | |
2217 | ||
2218 | ||
2219 | immediate_quit = 0; | |
1e142fb7 | 2220 | XSETFASTINT (val, from); |
8489eb67 RS |
2221 | return val; |
2222 | ||
2223 | lose: | |
7bf5e9e4 RS |
2224 | Fsignal (Qscan_error, |
2225 | Fcons (build_string ("Unbalanced parentheses"), | |
2226 | Fcons (make_number (last_good), | |
2227 | Fcons (make_number (from), Qnil)))); | |
2228 | ||
8489eb67 RS |
2229 | /* NOTREACHED */ |
2230 | } | |
2231 | ||
8489eb67 RS |
2232 | DEFUN ("scan-lists", Fscan_lists, Sscan_lists, 3, 3, 0, |
2233 | "Scan from character number FROM by COUNT lists.\n\ | |
2234 | Returns the character number of the position thus found.\n\ | |
2235 | \n\ | |
2236 | If DEPTH is nonzero, paren depth begins counting from that value,\n\ | |
2237 | only places where the depth in parentheses becomes zero\n\ | |
2238 | are candidates for stopping; COUNT such places are counted.\n\ | |
2239 | Thus, a positive value for DEPTH means go out levels.\n\ | |
2240 | \n\ | |
2241 | Comments are ignored if `parse-sexp-ignore-comments' is non-nil.\n\ | |
2242 | \n\ | |
2243 | If the beginning or end of (the accessible part of) the buffer is reached\n\ | |
2244 | and the depth is wrong, an error is signaled.\n\ | |
2245 | If the depth is right but the count is not used up, nil is returned.") | |
2246 | (from, count, depth) | |
2247 | Lisp_Object from, count, depth; | |
2248 | { | |
2249 | CHECK_NUMBER (from, 0); | |
2250 | CHECK_NUMBER (count, 1); | |
2251 | CHECK_NUMBER (depth, 2); | |
2252 | ||
2253 | return scan_lists (XINT (from), XINT (count), XINT (depth), 0); | |
2254 | } | |
2255 | ||
2256 | DEFUN ("scan-sexps", Fscan_sexps, Sscan_sexps, 2, 2, 0, | |
2257 | "Scan from character number FROM by COUNT balanced expressions.\n\ | |
2258 | If COUNT is negative, scan backwards.\n\ | |
2259 | Returns the character number of the position thus found.\n\ | |
2260 | \n\ | |
2261 | Comments are ignored if `parse-sexp-ignore-comments' is non-nil.\n\ | |
2262 | \n\ | |
2263 | If the beginning or end of (the accessible part of) the buffer is reached\n\ | |
2264 | in the middle of a parenthetical grouping, an error is signaled.\n\ | |
2265 | If the beginning or end is reached between groupings\n\ | |
2266 | but before count is used up, nil is returned.") | |
2267 | (from, count) | |
2268 | Lisp_Object from, count; | |
2269 | { | |
2270 | CHECK_NUMBER (from, 0); | |
2271 | CHECK_NUMBER (count, 1); | |
2272 | ||
2273 | return scan_lists (XINT (from), XINT (count), 0, 1); | |
2274 | } | |
2275 | ||
2276 | DEFUN ("backward-prefix-chars", Fbackward_prefix_chars, Sbackward_prefix_chars, | |
2277 | 0, 0, 0, | |
2278 | "Move point backward over any number of chars with prefix syntax.\n\ | |
2279 | This includes chars with \"quote\" or \"prefix\" syntax (' or p).") | |
2280 | () | |
2281 | { | |
2282 | int beg = BEGV; | |
6ec8bbd2 | 2283 | int pos = PT; |
93da5fff KH |
2284 | int c; |
2285 | int temp_pos = pos; | |
2286 | ||
195d1361 RS |
2287 | if (pos > beg) |
2288 | { | |
2289 | SETUP_SYNTAX_TABLE (pos, -1); | |
2290 | } | |
93da5fff | 2291 | DEC_POS (temp_pos); |
8489eb67 | 2292 | |
93da5fff | 2293 | while (pos > beg && !char_quoted (temp_pos) |
195d1361 | 2294 | /* Previous statement updates syntax table. */ |
93da5fff KH |
2295 | && ((c = FETCH_CHAR (temp_pos), SYNTAX (c) == Squote) |
2296 | || SYNTAX_PREFIX (c))) | |
2297 | { | |
2298 | pos = temp_pos; | |
2299 | DEC_POS (temp_pos); | |
2300 | } | |
8489eb67 RS |
2301 | |
2302 | SET_PT (pos); | |
2303 | ||
2304 | return Qnil; | |
2305 | } | |
2306 | \f | |
8489eb67 | 2307 | /* Parse forward from FROM to END, |
e5d4f4dc RS |
2308 | assuming that FROM has state OLDSTATE (nil means FROM is start of function), |
2309 | and return a description of the state of the parse at END. | |
c81a3712 | 2310 | If STOPBEFORE is nonzero, stop at the start of an atom. |
644ea4df RS |
2311 | If COMMENTSTOP is 1, stop at the start of a comment. |
2312 | If COMMENTSTOP is -1, stop at the start or end of a comment, | |
2313 | after the beginning of a string, or after the end of a string. */ | |
8489eb67 | 2314 | |
340f92b5 | 2315 | static void |
c81a3712 RS |
2316 | scan_sexps_forward (stateptr, from, end, targetdepth, |
2317 | stopbefore, oldstate, commentstop) | |
e5d4f4dc | 2318 | struct lisp_parse_state *stateptr; |
8489eb67 RS |
2319 | register int from; |
2320 | int end, targetdepth, stopbefore; | |
2321 | Lisp_Object oldstate; | |
c81a3712 | 2322 | int commentstop; |
8489eb67 RS |
2323 | { |
2324 | struct lisp_parse_state state; | |
2325 | ||
2326 | register enum syntaxcode code; | |
2327 | struct level { int last, prev; }; | |
2328 | struct level levelstart[100]; | |
2329 | register struct level *curlevel = levelstart; | |
2330 | struct level *endlevel = levelstart + 100; | |
93da5fff | 2331 | int prev; |
8489eb67 RS |
2332 | register int depth; /* Paren depth of current scanning location. |
2333 | level - levelstart equals this except | |
2334 | when the depth becomes negative. */ | |
2335 | int mindepth; /* Lowest DEPTH value seen. */ | |
2336 | int start_quoted = 0; /* Nonzero means starting after a char quote */ | |
2337 | Lisp_Object tem; | |
93da5fff | 2338 | int prev_from; /* Keep one character before FROM. */ |
195d1361 RS |
2339 | int boundary_stop = commentstop == -1; |
2340 | int nofence; | |
93da5fff KH |
2341 | |
2342 | prev_from = from; | |
2343 | DEC_POS (prev_from); | |
2344 | ||
2345 | /* Use this macro instead of `from++'. */ | |
2346 | #define INC_FROM do { prev_from = from; INC_POS (from); } while (0) | |
8489eb67 RS |
2347 | |
2348 | immediate_quit = 1; | |
2349 | QUIT; | |
2350 | ||
195d1361 RS |
2351 | SETUP_SYNTAX_TABLE (from, 1); |
2352 | ||
265a9e55 | 2353 | if (NILP (oldstate)) |
8489eb67 RS |
2354 | { |
2355 | depth = 0; | |
2356 | state.instring = -1; | |
2357 | state.incomment = 0; | |
195d1361 RS |
2358 | state.comstyle = 0; /* comment style a by default. */ |
2359 | state.comstr_start = -1; /* no comment/string seen. */ | |
8489eb67 RS |
2360 | } |
2361 | else | |
2362 | { | |
2363 | tem = Fcar (oldstate); | |
265a9e55 | 2364 | if (!NILP (tem)) |
8489eb67 RS |
2365 | depth = XINT (tem); |
2366 | else | |
2367 | depth = 0; | |
2368 | ||
2369 | oldstate = Fcdr (oldstate); | |
2370 | oldstate = Fcdr (oldstate); | |
2371 | oldstate = Fcdr (oldstate); | |
2372 | tem = Fcar (oldstate); | |
195d1361 RS |
2373 | /* Check whether we are inside string_fence-style string: */ |
2374 | state.instring = ( !NILP (tem) | |
2375 | ? ( INTEGERP (tem) ? XINT (tem) : ST_STRING_STYLE) | |
2376 | : -1); | |
8489eb67 RS |
2377 | |
2378 | oldstate = Fcdr (oldstate); | |
2379 | tem = Fcar (oldstate); | |
265a9e55 | 2380 | state.incomment = !NILP (tem); |
8489eb67 RS |
2381 | |
2382 | oldstate = Fcdr (oldstate); | |
2383 | tem = Fcar (oldstate); | |
265a9e55 | 2384 | start_quoted = !NILP (tem); |
e5d4f4dc RS |
2385 | |
2386 | /* if the eight element of the list is nil, we are in comment | |
195d1361 RS |
2387 | style a. If it is non-nil, we are in comment style b */ |
2388 | oldstate = Fcdr (oldstate); | |
e5d4f4dc | 2389 | oldstate = Fcdr (oldstate); |
195d1361 RS |
2390 | tem = Fcar (oldstate); |
2391 | state.comstyle = NILP (tem) ? 0 : ( EQ (tem, Qsyntax_table) | |
2392 | ? ST_COMMENT_STYLE : 1 ); | |
2393 | ||
e5d4f4dc | 2394 | oldstate = Fcdr (oldstate); |
e5d4f4dc | 2395 | tem = Fcar (oldstate); |
195d1361 | 2396 | state.comstr_start = NILP (tem) ? -1 : XINT (tem) ; |
8489eb67 RS |
2397 | } |
2398 | state.quoted = 0; | |
2399 | mindepth = depth; | |
2400 | ||
2401 | curlevel->prev = -1; | |
2402 | curlevel->last = -1; | |
2403 | ||
195d1361 | 2404 | /* Enter the loop at a place appropriate for initial state. */ |
8489eb67 RS |
2405 | |
2406 | if (state.incomment) goto startincomment; | |
2407 | if (state.instring >= 0) | |
2408 | { | |
195d1361 | 2409 | nofence = state.instring != ST_STRING_STYLE; |
8489eb67 RS |
2410 | if (start_quoted) goto startquotedinstring; |
2411 | goto startinstring; | |
2412 | } | |
2413 | if (start_quoted) goto startquoted; | |
2414 | ||
2415 | while (from < end) | |
2416 | { | |
195d1361 | 2417 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
e5d4f4dc | 2418 | code = SYNTAX (FETCH_CHAR (from)); |
93da5fff | 2419 | INC_FROM; |
4c920633 | 2420 | |
8f9dc2ed | 2421 | if (code == Scomment) |
195d1361 | 2422 | state.comstr_start = prev_from; |
4c920633 | 2423 | else if (code == Scomment_fence) |
e5d4f4dc RS |
2424 | { |
2425 | /* Record the comment style we have entered so that only | |
2426 | the comment-end sequence of the same style actually | |
2427 | terminates the comment section. */ | |
195d1361 RS |
2428 | state.comstyle = ( code == Scomment_fence |
2429 | ? ST_COMMENT_STYLE | |
2430 | : SYNTAX_COMMENT_STYLE (FETCH_CHAR (from))); | |
2431 | state.comstr_start = prev_from; | |
2432 | if (code != Scomment_fence) INC_FROM; | |
e5d4f4dc | 2433 | code = Scomment; |
e5d4f4dc | 2434 | } |
4c920633 RS |
2435 | else if (from < end) |
2436 | if (SYNTAX_COMSTART_FIRST (FETCH_CHAR (prev_from))) | |
2437 | if (SYNTAX_COMSTART_SECOND (FETCH_CHAR (from))) | |
2438 | /* Duplicate code to avoid a very complex if-expression | |
2439 | which causes trouble for the SGI compiler. */ | |
2440 | { | |
2441 | /* Record the comment style we have entered so that only | |
2442 | the comment-end sequence of the same style actually | |
2443 | terminates the comment section. */ | |
2444 | state.comstyle = ( code == Scomment_fence | |
2445 | ? ST_COMMENT_STYLE | |
2446 | : SYNTAX_COMMENT_STYLE (FETCH_CHAR (from))); | |
2447 | state.comstr_start = prev_from; | |
2448 | if (code != Scomment_fence) INC_FROM; | |
2449 | code = Scomment; | |
2450 | } | |
e5d4f4dc | 2451 | |
93da5fff | 2452 | if (SYNTAX_PREFIX (FETCH_CHAR (prev_from))) |
8489eb67 | 2453 | continue; |
0220c518 | 2454 | switch (SWITCH_ENUM_CAST (code)) |
8489eb67 RS |
2455 | { |
2456 | case Sescape: | |
2457 | case Scharquote: | |
2458 | if (stopbefore) goto stop; /* this arg means stop at sexp start */ | |
93da5fff | 2459 | curlevel->last = prev_from; |
8489eb67 RS |
2460 | startquoted: |
2461 | if (from == end) goto endquoted; | |
93da5fff | 2462 | INC_FROM; |
8489eb67 RS |
2463 | goto symstarted; |
2464 | /* treat following character as a word constituent */ | |
2465 | case Sword: | |
2466 | case Ssymbol: | |
2467 | if (stopbefore) goto stop; /* this arg means stop at sexp start */ | |
93da5fff | 2468 | curlevel->last = prev_from; |
8489eb67 RS |
2469 | symstarted: |
2470 | while (from < end) | |
2471 | { | |
195d1361 | 2472 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
0220c518 | 2473 | switch (SWITCH_ENUM_CAST (SYNTAX (FETCH_CHAR (from)))) |
8489eb67 RS |
2474 | { |
2475 | case Scharquote: | |
2476 | case Sescape: | |
93da5fff | 2477 | INC_FROM; |
8489eb67 RS |
2478 | if (from == end) goto endquoted; |
2479 | break; | |
2480 | case Sword: | |
2481 | case Ssymbol: | |
2482 | case Squote: | |
2483 | break; | |
2484 | default: | |
2485 | goto symdone; | |
2486 | } | |
93da5fff | 2487 | INC_FROM; |
8489eb67 RS |
2488 | } |
2489 | symdone: | |
2490 | curlevel->prev = curlevel->last; | |
2491 | break; | |
2492 | ||
5a28e48c | 2493 | startincomment: |
195d1361 | 2494 | if (commentstop == 1) |
5a28e48c RS |
2495 | goto done; |
2496 | if (from != BEGV) | |
2497 | { | |
2498 | /* Enter the loop in the middle so that we find | |
2499 | a 2-char comment ender if we start in the middle of it. */ | |
93da5fff | 2500 | prev = FETCH_CHAR (prev_from); |
5a28e48c RS |
2501 | goto startincomment_1; |
2502 | } | |
2503 | /* At beginning of buffer, enter the loop the ordinary way. */ | |
195d1361 RS |
2504 | state.incomment = 1; |
2505 | goto commentloop; | |
5a28e48c | 2506 | |
8489eb67 RS |
2507 | case Scomment: |
2508 | state.incomment = 1; | |
195d1361 RS |
2509 | if (commentstop || boundary_stop) goto done; |
2510 | commentloop: | |
8489eb67 RS |
2511 | while (1) |
2512 | { | |
2513 | if (from == end) goto done; | |
195d1361 | 2514 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
e5d4f4dc RS |
2515 | prev = FETCH_CHAR (from); |
2516 | if (SYNTAX (prev) == Sendcomment | |
2517 | && SYNTAX_COMMENT_STYLE (prev) == state.comstyle) | |
2518 | /* Only terminate the comment section if the endcomment | |
2519 | of the same style as the start sequence has been | |
2520 | encountered. */ | |
8489eb67 | 2521 | break; |
195d1361 RS |
2522 | if (state.comstyle == ST_COMMENT_STYLE |
2523 | && SYNTAX (prev) == Scomment_fence) | |
2524 | break; | |
93da5fff | 2525 | INC_FROM; |
5a28e48c | 2526 | startincomment_1: |
8489eb67 | 2527 | if (from < end && SYNTAX_COMEND_FIRST (prev) |
e5d4f4dc RS |
2528 | && SYNTAX_COMEND_SECOND (FETCH_CHAR (from)) |
2529 | && SYNTAX_COMMENT_STYLE (prev) == state.comstyle) | |
2530 | /* Only terminate the comment section if the end-comment | |
2531 | sequence of the same style as the start sequence has | |
2532 | been encountered. */ | |
195d1361 | 2533 | { break; } |
8489eb67 | 2534 | } |
195d1361 | 2535 | INC_FROM; |
8489eb67 | 2536 | state.incomment = 0; |
e5d4f4dc | 2537 | state.comstyle = 0; /* reset the comment style */ |
195d1361 | 2538 | if (boundary_stop) goto done; |
8489eb67 RS |
2539 | break; |
2540 | ||
2541 | case Sopen: | |
2542 | if (stopbefore) goto stop; /* this arg means stop at sexp start */ | |
2543 | depth++; | |
2544 | /* curlevel++->last ran into compiler bug on Apollo */ | |
93da5fff | 2545 | curlevel->last = prev_from; |
8489eb67 RS |
2546 | if (++curlevel == endlevel) |
2547 | error ("Nesting too deep for parser"); | |
2548 | curlevel->prev = -1; | |
2549 | curlevel->last = -1; | |
30844415 | 2550 | if (targetdepth == depth) goto done; |
8489eb67 RS |
2551 | break; |
2552 | ||
2553 | case Sclose: | |
2554 | depth--; | |
2555 | if (depth < mindepth) | |
2556 | mindepth = depth; | |
2557 | if (curlevel != levelstart) | |
2558 | curlevel--; | |
2559 | curlevel->prev = curlevel->last; | |
30844415 | 2560 | if (targetdepth == depth) goto done; |
8489eb67 RS |
2561 | break; |
2562 | ||
2563 | case Sstring: | |
195d1361 RS |
2564 | case Sstring_fence: |
2565 | state.comstr_start = from - 1; | |
8489eb67 | 2566 | if (stopbefore) goto stop; /* this arg means stop at sexp start */ |
93da5fff | 2567 | curlevel->last = prev_from; |
195d1361 RS |
2568 | state.instring = (code == Sstring |
2569 | ? (FETCH_CHAR (prev_from)) | |
2570 | : ST_STRING_STYLE); | |
2571 | if (boundary_stop) goto done; | |
8489eb67 | 2572 | startinstring: |
195d1361 | 2573 | { |
644ea4df | 2574 | nofence = state.instring != ST_STRING_STYLE; |
195d1361 | 2575 | |
644ea4df RS |
2576 | while (1) |
2577 | { | |
2578 | int c; | |
195d1361 | 2579 | |
644ea4df RS |
2580 | if (from >= end) goto done; |
2581 | c = FETCH_CHAR (from); | |
2582 | if (nofence && c == state.instring) break; | |
2583 | UPDATE_SYNTAX_TABLE_FORWARD (from); | |
2584 | switch (SWITCH_ENUM_CAST (SYNTAX (c))) | |
2585 | { | |
2586 | case Sstring_fence: | |
2587 | if (!nofence) goto string_end; | |
2588 | break; | |
2589 | case Scharquote: | |
2590 | case Sescape: | |
2591 | INC_FROM; | |
2592 | startquotedinstring: | |
2593 | if (from >= end) goto endquoted; | |
195d1361 | 2594 | } |
644ea4df RS |
2595 | INC_FROM; |
2596 | } | |
195d1361 RS |
2597 | } |
2598 | string_end: | |
8489eb67 RS |
2599 | state.instring = -1; |
2600 | curlevel->prev = curlevel->last; | |
93da5fff | 2601 | INC_FROM; |
195d1361 | 2602 | if (boundary_stop) goto done; |
8489eb67 RS |
2603 | break; |
2604 | ||
2605 | case Smath: | |
2606 | break; | |
2607 | } | |
2608 | } | |
2609 | goto done; | |
2610 | ||
2611 | stop: /* Here if stopping before start of sexp. */ | |
93da5fff | 2612 | from = prev_from; /* We have just fetched the char that starts it; */ |
8489eb67 RS |
2613 | goto done; /* but return the position before it. */ |
2614 | ||
2615 | endquoted: | |
2616 | state.quoted = 1; | |
2617 | done: | |
2618 | state.depth = depth; | |
2619 | state.mindepth = mindepth; | |
2620 | state.thislevelstart = curlevel->prev; | |
2621 | state.prevlevelstart | |
2622 | = (curlevel == levelstart) ? -1 : (curlevel - 1)->last; | |
2623 | state.location = from; | |
2624 | immediate_quit = 0; | |
2625 | ||
e5d4f4dc | 2626 | *stateptr = state; |
8489eb67 RS |
2627 | } |
2628 | ||
2629 | /* This comment supplies the doc string for parse-partial-sexp, | |
2630 | for make-docfile to see. We cannot put this in the real DEFUN | |
2631 | due to limits in the Unix cpp. | |
2632 | ||
c81a3712 | 2633 | DEFUN ("parse-partial-sexp", Ffoo, Sfoo, 2, 6, 0, |
8489eb67 RS |
2634 | "Parse Lisp syntax starting at FROM until TO; return status of parse at TO.\n\ |
2635 | Parsing stops at TO or when certain criteria are met;\n\ | |
2636 | point is set to where parsing stops.\n\ | |
2637 | If fifth arg STATE is omitted or nil,\n\ | |
2638 | parsing assumes that FROM is the beginning of a function.\n\ | |
195d1361 | 2639 | Value is a list of nine elements describing final state of parsing:\n\ |
af50f9e5 RS |
2640 | 0. depth in parens.\n\ |
2641 | 1. character address of start of innermost containing list; nil if none.\n\ | |
2642 | 2. character address of start of last complete sexp terminated.\n\ | |
2643 | 3. non-nil if inside a string.\n\ | |
195d1361 | 2644 | (it is the character that will terminate the string,\n\ |
bff37d2a | 2645 | or t if the string should be terminated by a generic string delimiter.)\n\ |
af50f9e5 RS |
2646 | 4. t if inside a comment.\n\ |
2647 | 5. t if following a quote character.\n\ | |
2648 | 6. the minimum paren-depth encountered during this scan.\n\ | |
bff37d2a RS |
2649 | 7. t if in a comment of style b; `syntax-table' if the comment\n\ |
2650 | should be terminated by a generic comment delimiter.\n\ | |
2651 | 8. character address of start of comment or string; nil if not in one.\n\ | |
8489eb67 RS |
2652 | If third arg TARGETDEPTH is non-nil, parsing stops if the depth\n\ |
2653 | in parentheses becomes equal to TARGETDEPTH.\n\ | |
2654 | Fourth arg STOPBEFORE non-nil means stop when come to\n\ | |
2655 | any character that starts a sexp.\n\ | |
bff37d2a RS |
2656 | Fifth arg STATE is a nine-element list like what this function returns.\n\ |
2657 | It is used to initialize the state of the parse. Elements number 1, 2, 6\n\ | |
2658 | and 8 are ignored; you can leave off element 8 (the last) entirely.\n\ | |
2659 | Sixth arg COMMENTSTOP non-nil means stop at the start of a comment.\n\ | |
2660 | If it is `syntax-table', stop after the start of a comment or a string,\n\ | |
2661 | or after end of a comment or a string.") | |
c81a3712 | 2662 | (from, to, targetdepth, stopbefore, state, commentstop) |
8489eb67 RS |
2663 | */ |
2664 | ||
c81a3712 | 2665 | DEFUN ("parse-partial-sexp", Fparse_partial_sexp, Sparse_partial_sexp, 2, 6, 0, |
8489eb67 | 2666 | 0 /* See immediately above */) |
c81a3712 RS |
2667 | (from, to, targetdepth, stopbefore, oldstate, commentstop) |
2668 | Lisp_Object from, to, targetdepth, stopbefore, oldstate, commentstop; | |
8489eb67 RS |
2669 | { |
2670 | struct lisp_parse_state state; | |
2671 | int target; | |
2672 | ||
265a9e55 | 2673 | if (!NILP (targetdepth)) |
8489eb67 RS |
2674 | { |
2675 | CHECK_NUMBER (targetdepth, 3); | |
2676 | target = XINT (targetdepth); | |
2677 | } | |
2678 | else | |
2679 | target = -100000; /* We won't reach this depth */ | |
2680 | ||
2681 | validate_region (&from, &to); | |
e5d4f4dc | 2682 | scan_sexps_forward (&state, XINT (from), XINT (to), |
c81a3712 | 2683 | target, !NILP (stopbefore), oldstate, |
195d1361 RS |
2684 | (NILP (commentstop) |
2685 | ? 0 : (EQ (commentstop, Qsyntax_table) ? -1 : 1))); | |
8489eb67 RS |
2686 | |
2687 | SET_PT (state.location); | |
2688 | ||
2689 | return Fcons (make_number (state.depth), | |
2690 | Fcons (state.prevlevelstart < 0 ? Qnil : make_number (state.prevlevelstart), | |
2691 | Fcons (state.thislevelstart < 0 ? Qnil : make_number (state.thislevelstart), | |
195d1361 RS |
2692 | Fcons (state.instring >= 0 |
2693 | ? (state.instring == ST_STRING_STYLE | |
2694 | ? Qt : make_number (state.instring)) : Qnil, | |
8489eb67 RS |
2695 | Fcons (state.incomment ? Qt : Qnil, |
2696 | Fcons (state.quoted ? Qt : Qnil, | |
bff37d2a RS |
2697 | Fcons (make_number (state.mindepth), |
2698 | Fcons ((state.comstyle | |
2699 | ? (state.comstyle == ST_COMMENT_STYLE | |
2700 | ? Qsyntax_table : Qt) : | |
2701 | Qnil), | |
2702 | Fcons ((state.incomment || state.instring | |
2703 | ? make_number (state.comstr_start) | |
2704 | : Qnil), | |
2705 | Qnil))))))))); | |
8489eb67 RS |
2706 | } |
2707 | \f | |
2708 | init_syntax_once () | |
2709 | { | |
78f9a1f7 | 2710 | register int i, c; |
8ea151b2 | 2711 | Lisp_Object temp; |
8489eb67 | 2712 | |
5ebaddf5 RS |
2713 | /* This has to be done here, before we call Fmake_char_table. */ |
2714 | Qsyntax_table = intern ("syntax-table"); | |
2715 | staticpro (&Qsyntax_table); | |
2716 | ||
2717 | /* Intern this now in case it isn't already done. | |
2718 | Setting this variable twice is harmless. | |
2719 | But don't staticpro it here--that is done in alloc.c. */ | |
2720 | Qchar_table_extra_slots = intern ("char-table-extra-slots"); | |
2721 | ||
93da5fff | 2722 | /* Create objects which can be shared among syntax tables. */ |
44d8a793 | 2723 | Vsyntax_code_object = Fmake_vector (make_number (13), Qnil); |
93da5fff KH |
2724 | for (i = 0; i < XVECTOR (Vsyntax_code_object)->size; i++) |
2725 | XVECTOR (Vsyntax_code_object)->contents[i] | |
2726 | = Fcons (make_number (i), Qnil); | |
2727 | ||
5ebaddf5 RS |
2728 | /* Now we are ready to set up this property, so we can |
2729 | create syntax tables. */ | |
2730 | Fput (Qsyntax_table, Qchar_table_extra_slots, make_number (0)); | |
2731 | ||
93da5fff | 2732 | temp = XVECTOR (Vsyntax_code_object)->contents[(int) Swhitespace]; |
8489eb67 | 2733 | |
5ebaddf5 | 2734 | Vstandard_syntax_table = Fmake_char_table (Qsyntax_table, temp); |
8489eb67 | 2735 | |
93da5fff | 2736 | temp = XVECTOR (Vsyntax_code_object)->contents[(int) Sword]; |
8489eb67 | 2737 | for (i = 'a'; i <= 'z'; i++) |
8ea151b2 | 2738 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, i, temp); |
8489eb67 | 2739 | for (i = 'A'; i <= 'Z'; i++) |
8ea151b2 | 2740 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, i, temp); |
8489eb67 | 2741 | for (i = '0'; i <= '9'; i++) |
8ea151b2 RS |
2742 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, i, temp); |
2743 | ||
2744 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '$', temp); | |
2745 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '%', temp); | |
2746 | ||
2747 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '(', | |
2748 | Fcons (make_number (Sopen), make_number (')'))); | |
2749 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, ')', | |
2750 | Fcons (make_number (Sclose), make_number ('('))); | |
2751 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '[', | |
2752 | Fcons (make_number (Sopen), make_number (']'))); | |
2753 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, ']', | |
2754 | Fcons (make_number (Sclose), make_number ('['))); | |
2755 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '{', | |
2756 | Fcons (make_number (Sopen), make_number ('}'))); | |
2757 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '}', | |
2758 | Fcons (make_number (Sclose), make_number ('{'))); | |
2759 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '"', | |
2760 | Fcons (make_number ((int) Sstring), Qnil)); | |
2761 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '\\', | |
2762 | Fcons (make_number ((int) Sescape), Qnil)); | |
2763 | ||
93da5fff | 2764 | temp = XVECTOR (Vsyntax_code_object)->contents[(int) Ssymbol]; |
8489eb67 | 2765 | for (i = 0; i < 10; i++) |
78f9a1f7 KH |
2766 | { |
2767 | c = "_-+*/&|<>="[i]; | |
2768 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, c, temp); | |
2769 | } | |
8489eb67 | 2770 | |
93da5fff | 2771 | temp = XVECTOR (Vsyntax_code_object)->contents[(int) Spunct]; |
8489eb67 | 2772 | for (i = 0; i < 12; i++) |
78f9a1f7 KH |
2773 | { |
2774 | c = ".,;:?!#@~^'`"[i]; | |
2775 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, c, temp); | |
2776 | } | |
8489eb67 RS |
2777 | } |
2778 | ||
2779 | syms_of_syntax () | |
2780 | { | |
2781 | Qsyntax_table_p = intern ("syntax-table-p"); | |
2782 | staticpro (&Qsyntax_table_p); | |
2783 | ||
93da5fff KH |
2784 | staticpro (&Vsyntax_code_object); |
2785 | ||
7bf5e9e4 RS |
2786 | Qscan_error = intern ("scan-error"); |
2787 | staticpro (&Qscan_error); | |
2788 | Fput (Qscan_error, Qerror_conditions, | |
2789 | Fcons (Qerror, Qnil)); | |
2790 | Fput (Qscan_error, Qerror_message, | |
2791 | build_string ("Scan error")); | |
2792 | ||
8489eb67 RS |
2793 | DEFVAR_BOOL ("parse-sexp-ignore-comments", &parse_sexp_ignore_comments, |
2794 | "Non-nil means `forward-sexp', etc., should treat comments as whitespace."); | |
2795 | ||
195d1361 RS |
2796 | DEFVAR_BOOL ("parse-sexp-lookup-properties", &parse_sexp_lookup_properties, |
2797 | "Non-nil means `forward-sexp', etc., grant `syntax-table' property.\n\ | |
2798 | The value of this property should be either a syntax table, or a cons\n\ | |
2799 | of the form (SYNTAXCODE . MATCHCHAR), SYNTAXCODE being the numeric\n\ | |
2800 | syntax code, MATCHCHAR being nil or the character to match (which is\n\ | |
2801 | relevant only for open/close type."); | |
2802 | ||
8489eb67 RS |
2803 | words_include_escapes = 0; |
2804 | DEFVAR_BOOL ("words-include-escapes", &words_include_escapes, | |
2805 | "Non-nil means `forward-word', etc., should treat escape chars part of words."); | |
2806 | ||
2807 | defsubr (&Ssyntax_table_p); | |
2808 | defsubr (&Ssyntax_table); | |
2809 | defsubr (&Sstandard_syntax_table); | |
2810 | defsubr (&Scopy_syntax_table); | |
2811 | defsubr (&Sset_syntax_table); | |
2812 | defsubr (&Schar_syntax); | |
beefa22e | 2813 | defsubr (&Smatching_paren); |
8489eb67 RS |
2814 | defsubr (&Smodify_syntax_entry); |
2815 | defsubr (&Sdescribe_syntax); | |
2816 | ||
2817 | defsubr (&Sforward_word); | |
2818 | ||
195d1361 RS |
2819 | defsubr (&Sskip_chars_forward); |
2820 | defsubr (&Sskip_chars_backward); | |
2821 | defsubr (&Sskip_syntax_forward); | |
2822 | defsubr (&Sskip_syntax_backward); | |
2823 | ||
b3cfe0c8 | 2824 | defsubr (&Sforward_comment); |
8489eb67 RS |
2825 | defsubr (&Sscan_lists); |
2826 | defsubr (&Sscan_sexps); | |
2827 | defsubr (&Sbackward_prefix_chars); | |
2828 | defsubr (&Sparse_partial_sexp); | |
2829 | } |