Commit | Line | Data |
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8489eb67 | 1 | /* GNU Emacs routines to deal with syntax tables; also word and list parsing. |
0b5538bd | 2 | Copyright (C) 1985, 1987, 1993, 1994, 1995, 1997, 1998, 1999, 2002, |
aaef169d | 3 | 2003, 2004, 2005, 2006 Free Software Foundation, Inc. |
8489eb67 RS |
4 | |
5 | This file is part of GNU Emacs. | |
6 | ||
7 | GNU Emacs is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
a4275ad1 | 9 | the Free Software Foundation; either version 2, or (at your option) |
8489eb67 RS |
10 | any later version. |
11 | ||
12 | GNU Emacs is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GNU Emacs; see the file COPYING. If not, write to | |
4fc5845f LK |
19 | the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
20 | Boston, MA 02110-1301, USA. */ | |
8489eb67 RS |
21 | |
22 | ||
18160b98 | 23 | #include <config.h> |
8489eb67 RS |
24 | #include <ctype.h> |
25 | #include "lisp.h" | |
26 | #include "commands.h" | |
27 | #include "buffer.h" | |
93da5fff | 28 | #include "charset.h" |
e35f6ff7 | 29 | #include "keymap.h" |
a1bc88d4 | 30 | #include "regex.h" |
195d1361 RS |
31 | |
32 | /* Make syntax table lookup grant data in gl_state. */ | |
33 | #define SYNTAX_ENTRY_VIA_PROPERTY | |
34 | ||
8489eb67 | 35 | #include "syntax.h" |
195d1361 RS |
36 | #include "intervals.h" |
37 | ||
38 | /* We use these constants in place for comment-style and | |
39 | string-ender-char to distinguish comments/strings started by | |
40 | comment_fence and string_fence codes. */ | |
41 | ||
42 | #define ST_COMMENT_STYLE (256 + 1) | |
43 | #define ST_STRING_STYLE (256 + 2) | |
93da5fff | 44 | #include "category.h" |
8489eb67 | 45 | |
7bf5e9e4 | 46 | Lisp_Object Qsyntax_table_p, Qsyntax_table, Qscan_error; |
8489eb67 RS |
47 | |
48 | int words_include_escapes; | |
195d1361 | 49 | int parse_sexp_lookup_properties; |
8489eb67 | 50 | |
bd25db08 KH |
51 | /* Nonzero means `scan-sexps' treat all multibyte characters as symbol. */ |
52 | int multibyte_syntax_as_symbol; | |
53 | ||
8ea151b2 RS |
54 | /* Used as a temporary in SYNTAX_ENTRY and other macros in syntax.h, |
55 | if not compiled with GCC. No need to mark it, since it is used | |
56 | only very temporarily. */ | |
57 | Lisp_Object syntax_temp; | |
58 | ||
f4ed767f GM |
59 | /* Non-zero means an open parenthesis in column 0 is always considered |
60 | to be the start of a defun. Zero means an open parenthesis in | |
61 | column 0 has no special meaning. */ | |
62 | ||
63 | int open_paren_in_column_0_is_defun_start; | |
64 | ||
e5d4f4dc RS |
65 | /* This is the internal form of the parse state used in parse-partial-sexp. */ |
66 | ||
67 | struct lisp_parse_state | |
68 | { | |
195d1361 RS |
69 | int depth; /* Depth at end of parsing. */ |
70 | int instring; /* -1 if not within string, else desired terminator. */ | |
95ff8dfc | 71 | int incomment; /* -1 if in unnestable comment else comment nesting */ |
195d1361 | 72 | int comstyle; /* comment style a=0, or b=1, or ST_COMMENT_STYLE. */ |
e5d4f4dc RS |
73 | int quoted; /* Nonzero if just after an escape char at end of parsing */ |
74 | int thislevelstart; /* Char number of most recent start-of-expression at current level */ | |
75 | int prevlevelstart; /* Char number of start of containing expression */ | |
195d1361 | 76 | int location; /* Char number at which parsing stopped. */ |
e5d4f4dc | 77 | int mindepth; /* Minimum depth seen while scanning. */ |
195d1361 | 78 | int comstr_start; /* Position just after last comment/string starter. */ |
1a102a58 RS |
79 | Lisp_Object levelstarts; /* Char numbers of starts-of-expression |
80 | of levels (starting from outermost). */ | |
e5d4f4dc RS |
81 | }; |
82 | \f | |
37bef230 RS |
83 | /* These variables are a cache for finding the start of a defun. |
84 | find_start_pos is the place for which the defun start was found. | |
85 | find_start_value is the defun start position found for it. | |
6a140a74 | 86 | find_start_value_byte is the corresponding byte position. |
37bef230 RS |
87 | find_start_buffer is the buffer it was found in. |
88 | find_start_begv is the BEGV value when it was found. | |
89 | find_start_modiff is the value of MODIFF when it was found. */ | |
90 | ||
91 | static int find_start_pos; | |
92 | static int find_start_value; | |
6a140a74 | 93 | static int find_start_value_byte; |
37bef230 RS |
94 | static struct buffer *find_start_buffer; |
95 | static int find_start_begv; | |
96 | static int find_start_modiff; | |
6a140a74 RS |
97 | |
98 | ||
99 | static int find_defun_start P_ ((int, int)); | |
932e6895 SM |
100 | static int back_comment P_ ((EMACS_INT, EMACS_INT, EMACS_INT, int, int, |
101 | EMACS_INT *, EMACS_INT *)); | |
6a140a74 | 102 | static int char_quoted P_ ((int, int)); |
a1bc88d4 | 103 | static Lisp_Object skip_chars P_ ((int, int, Lisp_Object, Lisp_Object, int)); |
932e6895 | 104 | static Lisp_Object scan_lists P_ ((EMACS_INT, EMACS_INT, EMACS_INT, int)); |
6a140a74 RS |
105 | static void scan_sexps_forward P_ ((struct lisp_parse_state *, |
106 | int, int, int, int, | |
107 | int, Lisp_Object, int)); | |
a1bc88d4 | 108 | static int in_classes P_ ((int, Lisp_Object)); |
195d1361 RS |
109 | \f |
110 | ||
111 | struct gl_state_s gl_state; /* Global state of syntax parser. */ | |
112 | ||
113 | INTERVAL interval_of (); | |
114 | #define INTERVALS_AT_ONCE 10 /* 1 + max-number of intervals | |
115 | to scan to property-change. */ | |
116 | ||
6a140a74 RS |
117 | /* Update gl_state to an appropriate interval which contains CHARPOS. The |
118 | sign of COUNT give the relative position of CHARPOS wrt the previously | |
195d1361 | 119 | valid interval. If INIT, only [be]_property fields of gl_state are |
6a140a74 | 120 | valid at start, the rest is filled basing on OBJECT. |
195d1361 | 121 | |
6a140a74 | 122 | `gl_state.*_i' are the intervals, and CHARPOS is further in the search |
195d1361 RS |
123 | direction than the intervals - or in an interval. We update the |
124 | current syntax-table basing on the property of this interval, and | |
6a140a74 | 125 | update the interval to start further than CHARPOS - or be |
195d1361 | 126 | NULL_INTERVAL. We also update lim_property to be the next value of |
6a140a74 | 127 | charpos to call this subroutine again - or be before/after the |
195d1361 RS |
128 | start/end of OBJECT. */ |
129 | ||
130 | void | |
6a140a74 RS |
131 | update_syntax_table (charpos, count, init, object) |
132 | int charpos, count, init; | |
195d1361 RS |
133 | Lisp_Object object; |
134 | { | |
135 | Lisp_Object tmp_table; | |
4ffe723b | 136 | int cnt = 0, invalidate = 1; |
5a774522 | 137 | INTERVAL i; |
195d1361 RS |
138 | |
139 | if (init) | |
140 | { | |
bb0de084 | 141 | gl_state.old_prop = Qnil; |
195d1361 RS |
142 | gl_state.start = gl_state.b_property; |
143 | gl_state.stop = gl_state.e_property; | |
bb0de084 SM |
144 | i = interval_of (charpos, object); |
145 | gl_state.backward_i = gl_state.forward_i = i; | |
195d1361 RS |
146 | invalidate = 0; |
147 | if (NULL_INTERVAL_P (i)) | |
148 | return; | |
f902a008 | 149 | /* interval_of updates only ->position of the return value, so |
d80f4cc7 | 150 | update the parents manually to speed up update_interval. */ |
bb0de084 | 151 | while (!NULL_PARENT (i)) |
d80f4cc7 RS |
152 | { |
153 | if (AM_RIGHT_CHILD (i)) | |
439d5cb4 | 154 | INTERVAL_PARENT (i)->position = i->position |
d80f4cc7 | 155 | - LEFT_TOTAL_LENGTH (i) + TOTAL_LENGTH (i) /* right end */ |
439d5cb4 KR |
156 | - TOTAL_LENGTH (INTERVAL_PARENT (i)) |
157 | + LEFT_TOTAL_LENGTH (INTERVAL_PARENT (i)); | |
d80f4cc7 | 158 | else |
439d5cb4 | 159 | INTERVAL_PARENT (i)->position = i->position - LEFT_TOTAL_LENGTH (i) |
d80f4cc7 | 160 | + TOTAL_LENGTH (i); |
439d5cb4 | 161 | i = INTERVAL_PARENT (i); |
d80f4cc7 RS |
162 | } |
163 | i = gl_state.forward_i; | |
bb0de084 | 164 | gl_state.b_property = i->position - gl_state.offset; |
ee0cdb48 | 165 | gl_state.e_property = INTERVAL_LAST_POS (i) - gl_state.offset; |
195d1361 RS |
166 | goto update; |
167 | } | |
5a774522 | 168 | i = count > 0 ? gl_state.forward_i : gl_state.backward_i; |
195d1361 | 169 | |
423e705d | 170 | /* We are guaranteed to be called with CHARPOS either in i, |
6a140a74 | 171 | or further off. */ |
195d1361 RS |
172 | if (NULL_INTERVAL_P (i)) |
173 | error ("Error in syntax_table logic for to-the-end intervals"); | |
6a140a74 | 174 | else if (charpos < i->position) /* Move left. */ |
195d1361 RS |
175 | { |
176 | if (count > 0) | |
f902a008 | 177 | error ("Error in syntax_table logic for intervals <-"); |
195d1361 | 178 | /* Update the interval. */ |
6a140a74 | 179 | i = update_interval (i, charpos); |
bb0de084 | 180 | if (INTERVAL_LAST_POS (i) != gl_state.b_property) |
195d1361 RS |
181 | { |
182 | invalidate = 0; | |
195d1361 | 183 | gl_state.forward_i = i; |
ee0cdb48 | 184 | gl_state.e_property = INTERVAL_LAST_POS (i) - gl_state.offset; |
195d1361 | 185 | } |
423e705d | 186 | } |
6a140a74 | 187 | else if (charpos >= INTERVAL_LAST_POS (i)) /* Move right. */ |
195d1361 RS |
188 | { |
189 | if (count < 0) | |
f902a008 | 190 | error ("Error in syntax_table logic for intervals ->"); |
195d1361 | 191 | /* Update the interval. */ |
6a140a74 | 192 | i = update_interval (i, charpos); |
bb0de084 | 193 | if (i->position != gl_state.e_property) |
195d1361 RS |
194 | { |
195 | invalidate = 0; | |
195d1361 | 196 | gl_state.backward_i = i; |
bb0de084 | 197 | gl_state.b_property = i->position - gl_state.offset; |
195d1361 RS |
198 | } |
199 | } | |
195d1361 RS |
200 | |
201 | update: | |
202 | tmp_table = textget (i->plist, Qsyntax_table); | |
203 | ||
204 | if (invalidate) | |
205 | invalidate = !EQ (tmp_table, gl_state.old_prop); /* Need to invalidate? */ | |
7d0393cf | 206 | |
423e705d SM |
207 | if (invalidate) /* Did not get to adjacent interval. */ |
208 | { /* with the same table => */ | |
209 | /* invalidate the old range. */ | |
195d1361 RS |
210 | if (count > 0) |
211 | { | |
212 | gl_state.backward_i = i; | |
bb0de084 SM |
213 | gl_state.b_property = i->position - gl_state.offset; |
214 | } | |
215 | else | |
195d1361 | 216 | { |
bb0de084 | 217 | gl_state.forward_i = i; |
ee0cdb48 | 218 | gl_state.e_property = INTERVAL_LAST_POS (i) - gl_state.offset; |
195d1361 RS |
219 | } |
220 | } | |
37bef230 | 221 | |
bb0de084 | 222 | if (!EQ (tmp_table, gl_state.old_prop)) |
195d1361 | 223 | { |
bb0de084 SM |
224 | gl_state.current_syntax_table = tmp_table; |
225 | gl_state.old_prop = tmp_table; | |
226 | if (EQ (Fsyntax_table_p (tmp_table), Qt)) | |
227 | { | |
228 | gl_state.use_global = 0; | |
7d0393cf | 229 | } |
bb0de084 SM |
230 | else if (CONSP (tmp_table)) |
231 | { | |
232 | gl_state.use_global = 1; | |
233 | gl_state.global_code = tmp_table; | |
234 | } | |
7d0393cf | 235 | else |
bb0de084 SM |
236 | { |
237 | gl_state.use_global = 0; | |
238 | gl_state.current_syntax_table = current_buffer->syntax_table; | |
239 | } | |
195d1361 RS |
240 | } |
241 | ||
242 | while (!NULL_INTERVAL_P (i)) | |
243 | { | |
244 | if (cnt && !EQ (tmp_table, textget (i->plist, Qsyntax_table))) | |
245 | { | |
246 | if (count > 0) | |
bb0de084 SM |
247 | { |
248 | gl_state.e_property = i->position - gl_state.offset; | |
249 | gl_state.forward_i = i; | |
250 | } | |
251 | else | |
252 | { | |
5a774522 SM |
253 | gl_state.b_property |
254 | = i->position + LENGTH (i) - gl_state.offset; | |
bb0de084 SM |
255 | gl_state.backward_i = i; |
256 | } | |
257 | return; | |
195d1361 | 258 | } |
7d0393cf | 259 | else if (cnt == INTERVALS_AT_ONCE) |
195d1361 RS |
260 | { |
261 | if (count > 0) | |
bb0de084 | 262 | { |
5a774522 SM |
263 | gl_state.e_property |
264 | = i->position + LENGTH (i) - gl_state.offset | |
265 | /* e_property at EOB is not set to ZV but to ZV+1, so that | |
266 | we can do INC(from);UPDATE_SYNTAX_TABLE_FORWARD without | |
267 | having to check eob between the two. */ | |
268 | + (NULL_INTERVAL_P (next_interval (i)) ? 1 : 0); | |
bb0de084 SM |
269 | gl_state.forward_i = i; |
270 | } | |
271 | else | |
272 | { | |
273 | gl_state.b_property = i->position - gl_state.offset; | |
274 | gl_state.backward_i = i; | |
275 | } | |
276 | return; | |
195d1361 RS |
277 | } |
278 | cnt++; | |
279 | i = count > 0 ? next_interval (i) : previous_interval (i); | |
280 | } | |
bb0de084 SM |
281 | eassert (NULL_INTERVAL_P (i)); /* This property goes to the end. */ |
282 | if (count > 0) | |
283 | gl_state.e_property = gl_state.stop; | |
284 | else | |
285 | gl_state.b_property = gl_state.start; | |
195d1361 RS |
286 | } |
287 | \f | |
6a140a74 RS |
288 | /* Returns TRUE if char at CHARPOS is quoted. |
289 | Global syntax-table data should be set up already to be good at CHARPOS | |
290 | or after. On return global syntax data is good for lookup at CHARPOS. */ | |
195d1361 RS |
291 | |
292 | static int | |
6a140a74 RS |
293 | char_quoted (charpos, bytepos) |
294 | register int charpos, bytepos; | |
195d1361 RS |
295 | { |
296 | register enum syntaxcode code; | |
297 | register int beg = BEGV; | |
298 | register int quoted = 0; | |
6a140a74 RS |
299 | int orig = charpos; |
300 | ||
301 | DEC_BOTH (charpos, bytepos); | |
195d1361 | 302 | |
709a47ce | 303 | while (charpos >= beg) |
195d1361 | 304 | { |
ab229fdd AS |
305 | int c; |
306 | ||
6a140a74 | 307 | UPDATE_SYNTAX_TABLE_BACKWARD (charpos); |
ab229fdd AS |
308 | c = FETCH_CHAR (bytepos); |
309 | code = SYNTAX (c); | |
6a140a74 RS |
310 | if (! (code == Scharquote || code == Sescape)) |
311 | break; | |
312 | ||
313 | DEC_BOTH (charpos, bytepos); | |
314 | quoted = !quoted; | |
195d1361 | 315 | } |
6a140a74 RS |
316 | |
317 | UPDATE_SYNTAX_TABLE (orig); | |
195d1361 RS |
318 | return quoted; |
319 | } | |
6a140a74 RS |
320 | |
321 | /* Return the bytepos one character after BYTEPOS. | |
322 | We assume that BYTEPOS is not at the end of the buffer. */ | |
323 | ||
324 | INLINE int | |
325 | inc_bytepos (bytepos) | |
326 | int bytepos; | |
327 | { | |
ef316cf0 RS |
328 | if (NILP (current_buffer->enable_multibyte_characters)) |
329 | return bytepos + 1; | |
330 | ||
6a140a74 RS |
331 | INC_POS (bytepos); |
332 | return bytepos; | |
333 | } | |
334 | ||
335 | /* Return the bytepos one character before BYTEPOS. | |
336 | We assume that BYTEPOS is not at the start of the buffer. */ | |
337 | ||
338 | INLINE int | |
339 | dec_bytepos (bytepos) | |
340 | int bytepos; | |
341 | { | |
ef316cf0 RS |
342 | if (NILP (current_buffer->enable_multibyte_characters)) |
343 | return bytepos - 1; | |
344 | ||
6a140a74 RS |
345 | DEC_POS (bytepos); |
346 | return bytepos; | |
347 | } | |
195d1361 | 348 | \f |
7cc80f0a RS |
349 | /* Return a defun-start position before before POS and not too far before. |
350 | It should be the last one before POS, or nearly the last. | |
351 | ||
352 | When open_paren_in_column_0_is_defun_start is nonzero, | |
1fd1cc2f | 353 | only the beginning of the buffer is treated as a defun-start. |
7cc80f0a RS |
354 | |
355 | We record the information about where the scan started | |
356 | and what its result was, so that another call in the same area | |
357 | can return the same value very quickly. | |
195d1361 RS |
358 | |
359 | There is no promise at which position the global syntax data is | |
360 | valid on return from the subroutine, so the caller should explicitly | |
361 | update the global data. */ | |
37bef230 RS |
362 | |
363 | static int | |
6a140a74 RS |
364 | find_defun_start (pos, pos_byte) |
365 | int pos, pos_byte; | |
37bef230 | 366 | { |
6a140a74 | 367 | int opoint = PT, opoint_byte = PT_BYTE; |
37bef230 | 368 | |
1fd1cc2f RS |
369 | if (!open_paren_in_column_0_is_defun_start) |
370 | { | |
371 | find_start_value_byte = BEGV_BYTE; | |
372 | return BEGV; | |
373 | } | |
374 | ||
37bef230 RS |
375 | /* Use previous finding, if it's valid and applies to this inquiry. */ |
376 | if (current_buffer == find_start_buffer | |
377 | /* Reuse the defun-start even if POS is a little farther on. | |
378 | POS might be in the next defun, but that's ok. | |
379 | Our value may not be the best possible, but will still be usable. */ | |
380 | && pos <= find_start_pos + 1000 | |
381 | && pos >= find_start_value | |
382 | && BEGV == find_start_begv | |
383 | && MODIFF == find_start_modiff) | |
384 | return find_start_value; | |
385 | ||
386 | /* Back up to start of line. */ | |
6a140a74 | 387 | scan_newline (pos, pos_byte, BEGV, BEGV_BYTE, -1, 1); |
37bef230 | 388 | |
195d1361 RS |
389 | /* We optimize syntax-table lookup for rare updates. Thus we accept |
390 | only those `^\s(' which are good in global _and_ text-property | |
391 | syntax-tables. */ | |
392 | gl_state.current_syntax_table = current_buffer->syntax_table; | |
393 | gl_state.use_global = 0; | |
1fd1cc2f | 394 | while (PT > BEGV) |
37bef230 | 395 | { |
ab229fdd AS |
396 | int c; |
397 | ||
1fd1cc2f RS |
398 | /* Open-paren at start of line means we may have found our |
399 | defun-start. */ | |
ab229fdd AS |
400 | c = FETCH_CHAR (PT_BYTE); |
401 | if (SYNTAX (c) == Sopen) | |
195d1361 | 402 | { |
1fd1cc2f | 403 | SETUP_SYNTAX_TABLE (PT + 1, -1); /* Try again... */ |
ab229fdd AS |
404 | c = FETCH_CHAR (PT_BYTE); |
405 | if (SYNTAX (c) == Sopen) | |
1fd1cc2f RS |
406 | break; |
407 | /* Now fallback to the default value. */ | |
408 | gl_state.current_syntax_table = current_buffer->syntax_table; | |
409 | gl_state.use_global = 0; | |
195d1361 | 410 | } |
1fd1cc2f RS |
411 | /* Move to beg of previous line. */ |
412 | scan_newline (PT, PT_BYTE, BEGV, BEGV_BYTE, -2, 1); | |
37bef230 RS |
413 | } |
414 | ||
415 | /* Record what we found, for the next try. */ | |
6a140a74 RS |
416 | find_start_value = PT; |
417 | find_start_value_byte = PT_BYTE; | |
37bef230 RS |
418 | find_start_buffer = current_buffer; |
419 | find_start_modiff = MODIFF; | |
420 | find_start_begv = BEGV; | |
421 | find_start_pos = pos; | |
422 | ||
6a140a74 RS |
423 | TEMP_SET_PT_BOTH (opoint, opoint_byte); |
424 | ||
37bef230 RS |
425 | return find_start_value; |
426 | } | |
427 | \f | |
f902a008 RS |
428 | /* Return the SYNTAX_COMEND_FIRST of the character before POS, POS_BYTE. */ |
429 | ||
430 | static int | |
431 | prev_char_comend_first (pos, pos_byte) | |
432 | int pos, pos_byte; | |
433 | { | |
434 | int c, val; | |
435 | ||
436 | DEC_BOTH (pos, pos_byte); | |
437 | UPDATE_SYNTAX_TABLE_BACKWARD (pos); | |
438 | c = FETCH_CHAR (pos_byte); | |
439 | val = SYNTAX_COMEND_FIRST (c); | |
440 | UPDATE_SYNTAX_TABLE_FORWARD (pos + 1); | |
441 | return val; | |
442 | } | |
443 | ||
444 | /* Return the SYNTAX_COMSTART_FIRST of the character before POS, POS_BYTE. */ | |
445 | ||
3f679f55 SM |
446 | /* static int |
447 | * prev_char_comstart_first (pos, pos_byte) | |
448 | * int pos, pos_byte; | |
449 | * { | |
450 | * int c, val; | |
7d0393cf | 451 | * |
3f679f55 SM |
452 | * DEC_BOTH (pos, pos_byte); |
453 | * UPDATE_SYNTAX_TABLE_BACKWARD (pos); | |
454 | * c = FETCH_CHAR (pos_byte); | |
455 | * val = SYNTAX_COMSTART_FIRST (c); | |
456 | * UPDATE_SYNTAX_TABLE_FORWARD (pos + 1); | |
457 | * return val; | |
458 | * } */ | |
f902a008 | 459 | |
6a140a74 RS |
460 | /* Checks whether charpos FROM is at the end of a comment. |
461 | FROM_BYTE is the bytepos corresponding to FROM. | |
462 | Do not move back before STOP. | |
463 | ||
464 | Return a positive value if we find a comment ending at FROM/FROM_BYTE; | |
465 | return -1 otherwise. | |
466 | ||
467 | If successful, store the charpos of the comment's beginning | |
468 | into *CHARPOS_PTR, and the bytepos into *BYTEPOS_PTR. | |
527a32d9 KH |
469 | |
470 | Global syntax data remains valid for backward search starting at | |
471 | the returned value (or at FROM, if the search was not successful). */ | |
195d1361 RS |
472 | |
473 | static int | |
95ff8dfc | 474 | back_comment (from, from_byte, stop, comnested, comstyle, charpos_ptr, bytepos_ptr) |
932e6895 | 475 | EMACS_INT from, from_byte, stop; |
95ff8dfc | 476 | int comnested, comstyle; |
932e6895 | 477 | EMACS_INT *charpos_ptr, *bytepos_ptr; |
195d1361 RS |
478 | { |
479 | /* Look back, counting the parity of string-quotes, | |
480 | and recording the comment-starters seen. | |
481 | When we reach a safe place, assume that's not in a string; | |
482 | then step the main scan to the earliest comment-starter seen | |
483 | an even number of string quotes away from the safe place. | |
484 | ||
485 | OFROM[I] is position of the earliest comment-starter seen | |
486 | which is I+2X quotes from the comment-end. | |
487 | PARITY is current parity of quotes from the comment end. */ | |
3ee5041c | 488 | int string_style = -1; /* Presumed outside of any string. */ |
195d1361 | 489 | int string_lossage = 0; |
f7c436c1 | 490 | /* Not a real lossage: indicates that we have passed a matching comment |
7d0393cf | 491 | starter plus a non-matching comment-ender, meaning that any matching |
f7c436c1 SM |
492 | comment-starter we might see later could be a false positive (hidden |
493 | inside another comment). | |
494 | Test case: { a (* b } c (* d *) */ | |
495 | int comment_lossage = 0; | |
195d1361 | 496 | int comment_end = from; |
6a140a74 | 497 | int comment_end_byte = from_byte; |
195d1361 | 498 | int comstart_pos = 0; |
6a140a74 | 499 | int comstart_byte; |
eb35b628 RS |
500 | /* Place where the containing defun starts, |
501 | or 0 if we didn't come across it yet. */ | |
502 | int defun_start = 0; | |
503 | int defun_start_byte = 0; | |
195d1361 | 504 | register enum syntaxcode code; |
95ff8dfc | 505 | int nesting = 1; /* current comment nesting */ |
ea315ed6 | 506 | int c; |
3f679f55 SM |
507 | int syntax = 0; |
508 | ||
509 | /* FIXME: A }} comment-ender style leads to incorrect behavior | |
510 | in the case of {{ c }}} because we ignore the last two chars which are | |
511 | assumed to be comment-enders although they aren't. */ | |
195d1361 RS |
512 | |
513 | /* At beginning of range to scan, we're outside of strings; | |
514 | that determines quote parity to the comment-end. */ | |
515 | while (from != stop) | |
516 | { | |
3f679f55 SM |
517 | int temp_byte, prev_syntax; |
518 | int com2start, com2end; | |
6a140a74 | 519 | |
195d1361 | 520 | /* Move back and examine a character. */ |
6a140a74 | 521 | DEC_BOTH (from, from_byte); |
195d1361 RS |
522 | UPDATE_SYNTAX_TABLE_BACKWARD (from); |
523 | ||
3f679f55 | 524 | prev_syntax = syntax; |
6a140a74 | 525 | c = FETCH_CHAR (from_byte); |
3f679f55 | 526 | syntax = SYNTAX_WITH_FLAGS (c); |
195d1361 RS |
527 | code = SYNTAX (c); |
528 | ||
3f679f55 SM |
529 | /* Check for 2-char comment markers. */ |
530 | com2start = (SYNTAX_FLAGS_COMSTART_FIRST (syntax) | |
531 | && SYNTAX_FLAGS_COMSTART_SECOND (prev_syntax) | |
532 | && comstyle == SYNTAX_FLAGS_COMMENT_STYLE (prev_syntax) | |
533 | && (SYNTAX_FLAGS_COMMENT_NESTED (prev_syntax) | |
534 | || SYNTAX_FLAGS_COMMENT_NESTED (syntax)) == comnested); | |
535 | com2end = (SYNTAX_FLAGS_COMEND_FIRST (syntax) | |
536 | && SYNTAX_FLAGS_COMEND_SECOND (prev_syntax)); | |
537 | ||
538 | /* Nasty cases with overlapping 2-char comment markers: | |
539 | - snmp-mode: -- c -- foo -- c -- | |
540 | --- c -- | |
541 | ------ c -- | |
542 | - c-mode: *||* | |
543 | |* *|* *| | |
544 | |*| |* |*| | |
545 | /// */ | |
546 | ||
547 | /* If a 2-char comment sequence partly overlaps with another, | |
548 | we don't try to be clever. */ | |
549 | if (from > stop && (com2end || com2start)) | |
195d1361 | 550 | { |
3f679f55 SM |
551 | int next = from, next_byte = from_byte, next_c, next_syntax; |
552 | DEC_BOTH (next, next_byte); | |
553 | UPDATE_SYNTAX_TABLE_BACKWARD (next); | |
554 | next_c = FETCH_CHAR (next_byte); | |
555 | next_syntax = SYNTAX_WITH_FLAGS (next_c); | |
556 | if (((com2start || comnested) | |
557 | && SYNTAX_FLAGS_COMEND_SECOND (syntax) | |
558 | && SYNTAX_FLAGS_COMEND_FIRST (next_syntax)) | |
559 | || ((com2end || comnested) | |
560 | && SYNTAX_FLAGS_COMSTART_SECOND (syntax) | |
561 | && comstyle == SYNTAX_FLAGS_COMMENT_STYLE (syntax) | |
562 | && SYNTAX_FLAGS_COMSTART_FIRST (next_syntax))) | |
563 | goto lossage; | |
564 | /* UPDATE_SYNTAX_TABLE_FORWARD (next + 1); */ | |
f902a008 | 565 | } |
3f679f55 SM |
566 | |
567 | if (com2start && comstart_pos == 0) | |
568 | /* We're looking at a comment starter. But it might be a comment | |
569 | ender as well (see snmp-mode). The first time we see one, we | |
570 | need to consider it as a comment starter, | |
571 | and the subsequent times as a comment ender. */ | |
572 | com2end = 0; | |
573 | ||
574 | /* Turn a 2-char comment sequences into the appropriate syntax. */ | |
575 | if (com2end) | |
576 | code = Sendcomment; | |
577 | else if (com2start) | |
578 | code = Scomment; | |
579 | /* Ignore comment starters of a different style. */ | |
580 | else if (code == Scomment | |
581 | && (comstyle != SYNTAX_FLAGS_COMMENT_STYLE (syntax) | |
582 | || SYNTAX_FLAGS_COMMENT_NESTED (syntax) != comnested)) | |
1aa963c8 | 583 | continue; |
195d1361 | 584 | |
9828a477 KH |
585 | /* Ignore escaped characters, except comment-enders. */ |
586 | if (code != Sendcomment && char_quoted (from, from_byte)) | |
195d1361 RS |
587 | continue; |
588 | ||
3ee5041c | 589 | switch (code) |
195d1361 | 590 | { |
3ee5041c SM |
591 | case Sstring_fence: |
592 | case Scomment_fence: | |
593 | c = (code == Sstring_fence ? ST_STRING_STYLE : ST_COMMENT_STYLE); | |
594 | case Sstring: | |
595 | /* Track parity of quotes. */ | |
596 | if (string_style == -1) | |
597 | /* Entering a string. */ | |
598 | string_style = c; | |
599 | else if (string_style == c) | |
600 | /* Leaving the string. */ | |
601 | string_style = -1; | |
602 | else | |
603 | /* If we have two kinds of string delimiters. | |
604 | There's no way to grok this scanning backwards. */ | |
195d1361 | 605 | string_lossage = 1; |
3ee5041c | 606 | break; |
7d0393cf | 607 | |
3ee5041c SM |
608 | case Scomment: |
609 | /* We've already checked that it is the relevant comstyle. */ | |
f7c436c1 | 610 | if (string_style != -1 || comment_lossage || string_lossage) |
3ee5041c SM |
611 | /* There are odd string quotes involved, so let's be careful. |
612 | Test case in Pascal: " { " a { " } */ | |
613 | goto lossage; | |
614 | ||
f7c436c1 SM |
615 | if (!comnested) |
616 | { | |
617 | /* Record best comment-starter so far. */ | |
618 | comstart_pos = from; | |
619 | comstart_byte = from_byte; | |
620 | } | |
621 | else if (--nesting <= 0) | |
95ff8dfc RS |
622 | /* nested comments have to be balanced, so we don't need to |
623 | keep looking for earlier ones. We use here the same (slightly | |
624 | incorrect) reasoning as below: since it is followed by uniform | |
625 | paired string quotes, this comment-start has to be outside of | |
626 | strings, else the comment-end itself would be inside a string. */ | |
627 | goto done; | |
3ee5041c SM |
628 | break; |
629 | ||
02010917 | 630 | case Sendcomment: |
3f679f55 | 631 | if (SYNTAX_FLAGS_COMMENT_STYLE (syntax) == comstyle |
d070eb22 | 632 | && ((com2end && SYNTAX_FLAGS_COMMENT_NESTED (prev_syntax)) |
3f679f55 | 633 | || SYNTAX_FLAGS_COMMENT_NESTED (syntax)) == comnested) |
02010917 SM |
634 | /* This is the same style of comment ender as ours. */ |
635 | { | |
636 | if (comnested) | |
637 | nesting++; | |
638 | else | |
639 | /* Anything before that can't count because it would match | |
640 | this comment-ender rather than ours. */ | |
641 | from = stop; /* Break out of the loop. */ | |
642 | } | |
f7c436c1 SM |
643 | else if (comstart_pos != 0 || c != '\n') |
644 | /* We're mixing comment styles here, so we'd better be careful. | |
645 | The (comstart_pos != 0 || c != '\n') check is not quite correct | |
646 | (we should just always set comment_lossage), but removing it | |
647 | would imply that any multiline comment in C would go through | |
648 | lossage, which seems overkill. | |
649 | The failure should only happen in the rare cases such as | |
650 | { (* } *) */ | |
651 | comment_lossage = 1; | |
02010917 | 652 | break; |
195d1361 | 653 | |
02010917 SM |
654 | case Sopen: |
655 | /* Assume a defun-start point is outside of strings. */ | |
656 | if (open_paren_in_column_0_is_defun_start | |
657 | && (from == stop | |
658 | || (temp_byte = dec_bytepos (from_byte), | |
659 | FETCH_CHAR (temp_byte) == '\n'))) | |
660 | { | |
661 | defun_start = from; | |
662 | defun_start_byte = from_byte; | |
663 | from = stop; /* Break out of the loop. */ | |
664 | } | |
eb35b628 | 665 | break; |
02010917 SM |
666 | |
667 | default: | |
f7c436c1 | 668 | break; |
eb35b628 | 669 | } |
195d1361 RS |
670 | } |
671 | ||
672 | if (comstart_pos == 0) | |
673 | { | |
674 | from = comment_end; | |
6a140a74 | 675 | from_byte = comment_end_byte; |
195d1361 RS |
676 | UPDATE_SYNTAX_TABLE_FORWARD (comment_end - 1); |
677 | } | |
f7c436c1 SM |
678 | /* If comstart_pos is set and we get here (ie. didn't jump to `lossage' |
679 | or `done'), then we've found the beginning of the non-nested comment. */ | |
680 | else if (1) /* !comnested */ | |
195d1361 RS |
681 | { |
682 | from = comstart_pos; | |
6a140a74 | 683 | from_byte = comstart_byte; |
789f3320 | 684 | UPDATE_SYNTAX_TABLE_FORWARD (from - 1); |
195d1361 RS |
685 | } |
686 | else | |
687 | { | |
3ee5041c SM |
688 | struct lisp_parse_state state; |
689 | lossage: | |
195d1361 RS |
690 | /* We had two kinds of string delimiters mixed up |
691 | together. Decode this going forwards. | |
02010917 | 692 | Scan fwd from a known safe place (beginning-of-defun) |
195d1361 RS |
693 | to the one in question; this records where we |
694 | last passed a comment starter. */ | |
eb35b628 RS |
695 | /* If we did not already find the defun start, find it now. */ |
696 | if (defun_start == 0) | |
697 | { | |
698 | defun_start = find_defun_start (comment_end, comment_end_byte); | |
699 | defun_start_byte = find_start_value_byte; | |
700 | } | |
02010917 | 701 | do |
195d1361 | 702 | { |
02010917 SM |
703 | scan_sexps_forward (&state, |
704 | defun_start, defun_start_byte, | |
705 | comment_end, -10000, 0, Qnil, 0); | |
706 | defun_start = comment_end; | |
707 | if (state.incomment == (comnested ? 1 : -1) | |
708 | && state.comstyle == comstyle) | |
709 | from = state.comstr_start; | |
710 | else | |
711 | { | |
712 | from = comment_end; | |
713 | if (state.incomment) | |
714 | /* If comment_end is inside some other comment, maybe ours | |
715 | is nested, so we need to try again from within the | |
716 | surrounding comment. Example: { a (* " *) */ | |
717 | { | |
718 | /* FIXME: We should advance by one or two chars. */ | |
719 | defun_start = state.comstr_start + 2; | |
720 | defun_start_byte = CHAR_TO_BYTE (defun_start); | |
721 | } | |
722 | } | |
723 | } while (defun_start < comment_end); | |
724 | ||
6a140a74 | 725 | from_byte = CHAR_TO_BYTE (from); |
195d1361 RS |
726 | UPDATE_SYNTAX_TABLE_FORWARD (from - 1); |
727 | } | |
7d0393cf | 728 | |
95ff8dfc | 729 | done: |
6a140a74 RS |
730 | *charpos_ptr = from; |
731 | *bytepos_ptr = from_byte; | |
732 | ||
1aa963c8 | 733 | return (from == comment_end) ? -1 : from; |
195d1361 RS |
734 | } |
735 | \f | |
8489eb67 | 736 | DEFUN ("syntax-table-p", Fsyntax_table_p, Ssyntax_table_p, 1, 1, 0, |
fdb82f93 PJ |
737 | doc: /* Return t if OBJECT is a syntax table. |
738 | Currently, any char-table counts as a syntax table. */) | |
739 | (object) | |
2203e1e8 | 740 | Lisp_Object object; |
8489eb67 | 741 | { |
2203e1e8 | 742 | if (CHAR_TABLE_P (object) |
e704cb4b | 743 | && EQ (XCHAR_TABLE (object)->purpose, Qsyntax_table)) |
8489eb67 RS |
744 | return Qt; |
745 | return Qnil; | |
746 | } | |
747 | ||
8ea151b2 | 748 | static void |
8489eb67 RS |
749 | check_syntax_table (obj) |
750 | Lisp_Object obj; | |
751 | { | |
47f5f6ae KS |
752 | CHECK_TYPE (CHAR_TABLE_P (obj) && EQ (XCHAR_TABLE (obj)->purpose, Qsyntax_table), |
753 | Qsyntax_table_p, obj); | |
7d0393cf | 754 | } |
8489eb67 | 755 | |
8489eb67 | 756 | DEFUN ("syntax-table", Fsyntax_table, Ssyntax_table, 0, 0, 0, |
fdb82f93 PJ |
757 | doc: /* Return the current syntax table. |
758 | This is the one specified by the current buffer. */) | |
759 | () | |
8489eb67 RS |
760 | { |
761 | return current_buffer->syntax_table; | |
762 | } | |
763 | ||
764 | DEFUN ("standard-syntax-table", Fstandard_syntax_table, | |
765 | Sstandard_syntax_table, 0, 0, 0, | |
fdb82f93 PJ |
766 | doc: /* Return the standard syntax table. |
767 | This is the one used for new buffers. */) | |
768 | () | |
8489eb67 RS |
769 | { |
770 | return Vstandard_syntax_table; | |
771 | } | |
772 | ||
773 | DEFUN ("copy-syntax-table", Fcopy_syntax_table, Scopy_syntax_table, 0, 1, 0, | |
fdb82f93 PJ |
774 | doc: /* Construct a new syntax table and return it. |
775 | It is a copy of the TABLE, which defaults to the standard syntax table. */) | |
776 | (table) | |
8489eb67 RS |
777 | Lisp_Object table; |
778 | { | |
8ea151b2 RS |
779 | Lisp_Object copy; |
780 | ||
265a9e55 | 781 | if (!NILP (table)) |
8ea151b2 RS |
782 | check_syntax_table (table); |
783 | else | |
784 | table = Vstandard_syntax_table; | |
785 | ||
786 | copy = Fcopy_sequence (table); | |
0f867324 RS |
787 | |
788 | /* Only the standard syntax table should have a default element. | |
789 | Other syntax tables should inherit from parents instead. */ | |
790 | XCHAR_TABLE (copy)->defalt = Qnil; | |
791 | ||
792 | /* Copied syntax tables should all have parents. | |
793 | If we copied one with no parent, such as the standard syntax table, | |
794 | use the standard syntax table as the copy's parent. */ | |
795 | if (NILP (XCHAR_TABLE (copy)->parent)) | |
796 | Fset_char_table_parent (copy, Vstandard_syntax_table); | |
8ea151b2 | 797 | return copy; |
8489eb67 RS |
798 | } |
799 | ||
800 | DEFUN ("set-syntax-table", Fset_syntax_table, Sset_syntax_table, 1, 1, 0, | |
fdb82f93 PJ |
801 | doc: /* Select a new syntax table for the current buffer. |
802 | One argument, a syntax table. */) | |
803 | (table) | |
8489eb67 RS |
804 | Lisp_Object table; |
805 | { | |
4e4dfa78 | 806 | int idx; |
8ea151b2 | 807 | check_syntax_table (table); |
8489eb67 RS |
808 | current_buffer->syntax_table = table; |
809 | /* Indicate that this buffer now has a specified syntax table. */ | |
f6cd0527 GM |
810 | idx = PER_BUFFER_VAR_IDX (syntax_table); |
811 | SET_PER_BUFFER_VALUE_P (current_buffer, idx, 1); | |
8489eb67 RS |
812 | return table; |
813 | } | |
814 | \f | |
815 | /* Convert a letter which signifies a syntax code | |
816 | into the code it signifies. | |
195d1361 | 817 | This is used by modify-syntax-entry, and other things. */ |
8489eb67 RS |
818 | |
819 | unsigned char syntax_spec_code[0400] = | |
820 | { 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
821 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
822 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
823 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
195d1361 | 824 | (char) Swhitespace, (char) Scomment_fence, (char) Sstring, 0377, |
8489eb67 RS |
825 | (char) Smath, 0377, 0377, (char) Squote, |
826 | (char) Sopen, (char) Sclose, 0377, 0377, | |
827 | 0377, (char) Swhitespace, (char) Spunct, (char) Scharquote, | |
828 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
829 | 0377, 0377, 0377, 0377, | |
830 | (char) Scomment, 0377, (char) Sendcomment, 0377, | |
6cb71bf6 | 831 | (char) Sinherit, 0377, 0377, 0377, 0377, 0377, 0377, 0377, /* @, A ... */ |
8489eb67 RS |
832 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, |
833 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, (char) Sword, | |
834 | 0377, 0377, 0377, 0377, (char) Sescape, 0377, 0377, (char) Ssymbol, | |
835 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, /* `, a, ... */ | |
836 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
837 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, (char) Sword, | |
195d1361 | 838 | 0377, 0377, 0377, 0377, (char) Sstring_fence, 0377, 0377, 0377 |
8489eb67 RS |
839 | }; |
840 | ||
195d1361 | 841 | /* Indexed by syntax code, give the letter that describes it. */ |
8489eb67 | 842 | |
195d1361 | 843 | char syntax_code_spec[16] = |
8489eb67 | 844 | { |
195d1361 RS |
845 | ' ', '.', 'w', '_', '(', ')', '\'', '\"', '$', '\\', '/', '<', '>', '@', |
846 | '!', '|' | |
8489eb67 | 847 | }; |
93da5fff KH |
848 | |
849 | /* Indexed by syntax code, give the object (cons of syntax code and | |
850 | nil) to be stored in syntax table. Since these objects can be | |
851 | shared among syntax tables, we generate them in advance. By | |
852 | sharing objects, the function `describe-syntax' can give a more | |
853 | compact listing. */ | |
854 | static Lisp_Object Vsyntax_code_object; | |
855 | ||
8489eb67 | 856 | \f |
8ea151b2 RS |
857 | /* Look up the value for CHARACTER in syntax table TABLE's parent |
858 | and its parents. SYNTAX_ENTRY calls this, when TABLE itself has nil | |
859 | for CHARACTER. It's actually used only when not compiled with GCC. */ | |
860 | ||
861 | Lisp_Object | |
862 | syntax_parent_lookup (table, character) | |
863 | Lisp_Object table; | |
864 | int character; | |
865 | { | |
866 | Lisp_Object value; | |
867 | ||
868 | while (1) | |
869 | { | |
870 | table = XCHAR_TABLE (table)->parent; | |
871 | if (NILP (table)) | |
872 | return Qnil; | |
873 | ||
874 | value = XCHAR_TABLE (table)->contents[character]; | |
875 | if (!NILP (value)) | |
876 | return value; | |
877 | } | |
878 | } | |
879 | ||
8489eb67 | 880 | DEFUN ("char-syntax", Fchar_syntax, Schar_syntax, 1, 1, 0, |
fdb82f93 PJ |
881 | doc: /* Return the syntax code of CHARACTER, described by a character. |
882 | For example, if CHARACTER is a word constituent, | |
883 | the character `w' is returned. | |
884 | The characters that correspond to various syntax codes | |
885 | are listed in the documentation of `modify-syntax-entry'. */) | |
886 | (character) | |
2203e1e8 | 887 | Lisp_Object character; |
8489eb67 | 888 | { |
8ea151b2 | 889 | int char_int; |
195d1361 RS |
890 | gl_state.current_syntax_table = current_buffer->syntax_table; |
891 | ||
892 | gl_state.use_global = 0; | |
b7826503 | 893 | CHECK_NUMBER (character); |
2203e1e8 | 894 | char_int = XINT (character); |
8ea151b2 | 895 | return make_number (syntax_code_spec[(int) SYNTAX (char_int)]); |
beefa22e RS |
896 | } |
897 | ||
898 | DEFUN ("matching-paren", Fmatching_paren, Smatching_paren, 1, 1, 0, | |
fdb82f93 PJ |
899 | doc: /* Return the matching parenthesis of CHARACTER, or nil if none. */) |
900 | (character) | |
2203e1e8 | 901 | Lisp_Object character; |
beefa22e | 902 | { |
8ea151b2 | 903 | int char_int, code; |
195d1361 RS |
904 | gl_state.current_syntax_table = current_buffer->syntax_table; |
905 | gl_state.use_global = 0; | |
b7826503 | 906 | CHECK_NUMBER (character); |
2203e1e8 | 907 | char_int = XINT (character); |
8ea151b2 | 908 | code = SYNTAX (char_int); |
a8bd7cd8 | 909 | if (code == Sopen || code == Sclose) |
2e34157c | 910 | return SYNTAX_MATCH (char_int); |
beefa22e | 911 | return Qnil; |
8489eb67 RS |
912 | } |
913 | ||
c65adb44 | 914 | DEFUN ("string-to-syntax", Fstring_to_syntax, Sstring_to_syntax, 1, 1, 0, |
fdb82f93 PJ |
915 | doc: /* Convert a syntax specification STRING into syntax cell form. |
916 | STRING should be a string as it is allowed as argument of | |
917 | `modify-syntax-entry'. Value is the equivalent cons cell | |
918 | (CODE . MATCHING-CHAR) that can be used as value of a `syntax-table' | |
919 | text property. */) | |
920 | (string) | |
c65adb44 | 921 | Lisp_Object string; |
8489eb67 | 922 | { |
2e567bd3 | 923 | register const unsigned char *p; |
8489eb67 | 924 | register enum syntaxcode code; |
247e20a8 | 925 | int val; |
8ea151b2 | 926 | Lisp_Object match; |
8489eb67 | 927 | |
b7826503 | 928 | CHECK_STRING (string); |
8489eb67 | 929 | |
d5db4077 | 930 | p = SDATA (string); |
8489eb67 RS |
931 | code = (enum syntaxcode) syntax_spec_code[*p++]; |
932 | if (((int) code & 0377) == 0377) | |
b764a653 | 933 | error ("Invalid syntax description letter: %c", p[-1]); |
8489eb67 | 934 | |
8ea151b2 | 935 | if (code == Sinherit) |
c65adb44 | 936 | return Qnil; |
8ea151b2 RS |
937 | |
938 | if (*p) | |
d1be9f0f | 939 | { |
93da5fff | 940 | int len; |
7c19e8e1 | 941 | int character = (STRING_CHAR_AND_LENGTH |
d5db4077 | 942 | (p, SBYTES (string) - 1, len)); |
93da5fff | 943 | XSETINT (match, character); |
d1be9f0f RS |
944 | if (XFASTINT (match) == ' ') |
945 | match = Qnil; | |
93da5fff | 946 | p += len; |
d1be9f0f RS |
947 | } |
948 | else | |
8ea151b2 | 949 | match = Qnil; |
8489eb67 | 950 | |
8ea151b2 | 951 | val = (int) code; |
8489eb67 RS |
952 | while (*p) |
953 | switch (*p++) | |
954 | { | |
955 | case '1': | |
247e20a8 | 956 | val |= 1 << 16; |
8489eb67 RS |
957 | break; |
958 | ||
959 | case '2': | |
247e20a8 | 960 | val |= 1 << 17; |
8489eb67 RS |
961 | break; |
962 | ||
963 | case '3': | |
247e20a8 | 964 | val |= 1 << 18; |
8489eb67 RS |
965 | break; |
966 | ||
967 | case '4': | |
247e20a8 | 968 | val |= 1 << 19; |
8489eb67 RS |
969 | break; |
970 | ||
971 | case 'p': | |
247e20a8 | 972 | val |= 1 << 20; |
8489eb67 | 973 | break; |
e5d4f4dc RS |
974 | |
975 | case 'b': | |
247e20a8 | 976 | val |= 1 << 21; |
e5d4f4dc | 977 | break; |
95ff8dfc RS |
978 | |
979 | case 'n': | |
980 | val |= 1 << 22; | |
981 | break; | |
8489eb67 | 982 | } |
7d0393cf | 983 | |
93da5fff | 984 | if (val < XVECTOR (Vsyntax_code_object)->size && NILP (match)) |
c65adb44 | 985 | return XVECTOR (Vsyntax_code_object)->contents[val]; |
93da5fff KH |
986 | else |
987 | /* Since we can't use a shared object, let's make a new one. */ | |
c65adb44 SM |
988 | return Fcons (make_number (val), match); |
989 | } | |
990 | ||
fdb82f93 | 991 | /* I really don't know why this is interactive |
2c9e1900 | 992 | help-form should at least be made useful whilst reading the second arg. */ |
7d0393cf | 993 | DEFUN ("modify-syntax-entry", Fmodify_syntax_entry, Smodify_syntax_entry, 2, 3, |
c65adb44 | 994 | "cSet syntax for character: \nsSet syntax for %s to: ", |
a50a10a0 | 995 | doc: /* Set syntax for character CHAR according to string NEWENTRY. |
d7ee9fab | 996 | The syntax is changed only for table SYNTAX-TABLE, which defaults to |
fdb82f93 PJ |
997 | the current buffer's syntax table. |
998 | The first character of NEWENTRY should be one of the following: | |
999 | Space or - whitespace syntax. w word constituent. | |
1000 | _ symbol constituent. . punctuation. | |
1001 | ( open-parenthesis. ) close-parenthesis. | |
1002 | " string quote. \\ escape. | |
1003 | $ paired delimiter. ' expression quote or prefix operator. | |
1004 | < comment starter. > comment ender. | |
1005 | / character-quote. @ inherit from `standard-syntax-table'. | |
1006 | | generic string fence. ! generic comment fence. | |
1007 | ||
1008 | Only single-character comment start and end sequences are represented thus. | |
1009 | Two-character sequences are represented as described below. | |
1010 | The second character of NEWENTRY is the matching parenthesis, | |
1011 | used only if the first character is `(' or `)'. | |
1012 | Any additional characters are flags. | |
1013 | Defined flags are the characters 1, 2, 3, 4, b, p, and n. | |
a50a10a0 PJ |
1014 | 1 means CHAR is the start of a two-char comment start sequence. |
1015 | 2 means CHAR is the second character of such a sequence. | |
1016 | 3 means CHAR is the start of a two-char comment end sequence. | |
1017 | 4 means CHAR is the second character of such a sequence. | |
fdb82f93 PJ |
1018 | |
1019 | There can be up to two orthogonal comment sequences. This is to support | |
1020 | language modes such as C++. By default, all comment sequences are of style | |
1021 | a, but you can set the comment sequence style to b (on the second character | |
1022 | of a comment-start, or the first character of a comment-end sequence) using | |
1023 | this flag: | |
a50a10a0 PJ |
1024 | b means CHAR is part of comment sequence b. |
1025 | n means CHAR is part of a nestable comment sequence. | |
fdb82f93 | 1026 | |
a50a10a0 | 1027 | p means CHAR is a prefix character for `backward-prefix-chars'; |
fdb82f93 | 1028 | such characters are treated as whitespace when they occur |
a50a10a0 PJ |
1029 | between expressions. |
1030 | usage: (modify-syntax-entry CHAR NEWENTRY &optional SYNTAX-TABLE) */) | |
fdb82f93 | 1031 | (c, newentry, syntax_table) |
c65adb44 SM |
1032 | Lisp_Object c, newentry, syntax_table; |
1033 | { | |
b7826503 | 1034 | CHECK_NUMBER (c); |
c65adb44 SM |
1035 | |
1036 | if (NILP (syntax_table)) | |
1037 | syntax_table = current_buffer->syntax_table; | |
1038 | else | |
1039 | check_syntax_table (syntax_table); | |
8489eb67 | 1040 | |
c65adb44 | 1041 | SET_RAW_SYNTAX_ENTRY (syntax_table, XINT (c), Fstring_to_syntax (newentry)); |
8489eb67 RS |
1042 | return Qnil; |
1043 | } | |
1044 | \f | |
1045 | /* Dump syntax table to buffer in human-readable format */ | |
1046 | ||
62abe9cb SM |
1047 | DEFUN ("internal-describe-syntax-value", Finternal_describe_syntax_value, |
1048 | Sinternal_describe_syntax_value, 1, 1, 0, | |
1049 | doc: /* Insert a description of the internal syntax description SYNTAX at point. */) | |
1050 | (syntax) | |
1051 | Lisp_Object syntax; | |
8489eb67 RS |
1052 | { |
1053 | register enum syntaxcode code; | |
e6365855 | 1054 | char desc, start1, start2, end1, end2, prefix, comstyle, comnested; |
8489eb67 | 1055 | char str[2]; |
62abe9cb | 1056 | Lisp_Object first, match_lisp, value = syntax; |
8489eb67 | 1057 | |
8ea151b2 RS |
1058 | if (NILP (value)) |
1059 | { | |
62abe9cb SM |
1060 | insert_string ("default"); |
1061 | return syntax; | |
8ea151b2 RS |
1062 | } |
1063 | ||
908b7fea KH |
1064 | if (CHAR_TABLE_P (value)) |
1065 | { | |
62abe9cb SM |
1066 | insert_string ("deeper char-table ..."); |
1067 | return syntax; | |
908b7fea KH |
1068 | } |
1069 | ||
8ea151b2 RS |
1070 | if (!CONSP (value)) |
1071 | { | |
62abe9cb SM |
1072 | insert_string ("invalid"); |
1073 | return syntax; | |
8ea151b2 RS |
1074 | } |
1075 | ||
c1d497be KR |
1076 | first = XCAR (value); |
1077 | match_lisp = XCDR (value); | |
8ea151b2 RS |
1078 | |
1079 | if (!INTEGERP (first) || !(NILP (match_lisp) || INTEGERP (match_lisp))) | |
8489eb67 | 1080 | { |
62abe9cb SM |
1081 | insert_string ("invalid"); |
1082 | return syntax; | |
8489eb67 RS |
1083 | } |
1084 | ||
e704cb4b | 1085 | code = (enum syntaxcode) (XINT (first) & 0377); |
8ea151b2 RS |
1086 | start1 = (XINT (first) >> 16) & 1; |
1087 | start2 = (XINT (first) >> 17) & 1; | |
1088 | end1 = (XINT (first) >> 18) & 1; | |
1089 | end2 = (XINT (first) >> 19) & 1; | |
1090 | prefix = (XINT (first) >> 20) & 1; | |
1091 | comstyle = (XINT (first) >> 21) & 1; | |
e6365855 | 1092 | comnested = (XINT (first) >> 22) & 1; |
8489eb67 RS |
1093 | |
1094 | if ((int) code < 0 || (int) code >= (int) Smax) | |
1095 | { | |
1096 | insert_string ("invalid"); | |
62abe9cb | 1097 | return syntax; |
8489eb67 RS |
1098 | } |
1099 | desc = syntax_code_spec[(int) code]; | |
1100 | ||
1101 | str[0] = desc, str[1] = 0; | |
1102 | insert (str, 1); | |
1103 | ||
93da5fff KH |
1104 | if (NILP (match_lisp)) |
1105 | insert (" ", 1); | |
1106 | else | |
1107 | insert_char (XINT (match_lisp)); | |
8489eb67 | 1108 | |
8489eb67 RS |
1109 | if (start1) |
1110 | insert ("1", 1); | |
1111 | if (start2) | |
1112 | insert ("2", 1); | |
1113 | ||
1114 | if (end1) | |
1115 | insert ("3", 1); | |
1116 | if (end2) | |
1117 | insert ("4", 1); | |
1118 | ||
1119 | if (prefix) | |
1120 | insert ("p", 1); | |
e5d4f4dc RS |
1121 | if (comstyle) |
1122 | insert ("b", 1); | |
e6365855 SM |
1123 | if (comnested) |
1124 | insert ("n", 1); | |
8489eb67 RS |
1125 | |
1126 | insert_string ("\twhich means: "); | |
1127 | ||
0220c518 | 1128 | switch (SWITCH_ENUM_CAST (code)) |
8489eb67 RS |
1129 | { |
1130 | case Swhitespace: | |
1131 | insert_string ("whitespace"); break; | |
1132 | case Spunct: | |
1133 | insert_string ("punctuation"); break; | |
1134 | case Sword: | |
1135 | insert_string ("word"); break; | |
1136 | case Ssymbol: | |
1137 | insert_string ("symbol"); break; | |
1138 | case Sopen: | |
1139 | insert_string ("open"); break; | |
1140 | case Sclose: | |
1141 | insert_string ("close"); break; | |
1142 | case Squote: | |
d671382e | 1143 | insert_string ("prefix"); break; |
8489eb67 RS |
1144 | case Sstring: |
1145 | insert_string ("string"); break; | |
1146 | case Smath: | |
1147 | insert_string ("math"); break; | |
1148 | case Sescape: | |
1149 | insert_string ("escape"); break; | |
1150 | case Scharquote: | |
1151 | insert_string ("charquote"); break; | |
1152 | case Scomment: | |
1153 | insert_string ("comment"); break; | |
1154 | case Sendcomment: | |
1155 | insert_string ("endcomment"); break; | |
d671382e SM |
1156 | case Sinherit: |
1157 | insert_string ("inherit"); break; | |
1158 | case Scomment_fence: | |
1159 | insert_string ("comment fence"); break; | |
1160 | case Sstring_fence: | |
1161 | insert_string ("string fence"); break; | |
8489eb67 RS |
1162 | default: |
1163 | insert_string ("invalid"); | |
62abe9cb | 1164 | return syntax; |
8489eb67 RS |
1165 | } |
1166 | ||
8ea151b2 | 1167 | if (!NILP (match_lisp)) |
8489eb67 RS |
1168 | { |
1169 | insert_string (", matches "); | |
8ea151b2 | 1170 | insert_char (XINT (match_lisp)); |
8489eb67 RS |
1171 | } |
1172 | ||
1173 | if (start1) | |
1174 | insert_string (",\n\t is the first character of a comment-start sequence"); | |
1175 | if (start2) | |
1176 | insert_string (",\n\t is the second character of a comment-start sequence"); | |
1177 | ||
1178 | if (end1) | |
1179 | insert_string (",\n\t is the first character of a comment-end sequence"); | |
1180 | if (end2) | |
1181 | insert_string (",\n\t is the second character of a comment-end sequence"); | |
e5d4f4dc RS |
1182 | if (comstyle) |
1183 | insert_string (" (comment style b)"); | |
e6365855 SM |
1184 | if (comnested) |
1185 | insert_string (" (nestable)"); | |
e5d4f4dc | 1186 | |
8489eb67 RS |
1187 | if (prefix) |
1188 | insert_string (",\n\t is a prefix character for `backward-prefix-chars'"); | |
1189 | ||
62abe9cb SM |
1190 | return syntax; |
1191 | } | |
8489eb67 | 1192 | \f |
195d1361 RS |
1193 | int parse_sexp_ignore_comments; |
1194 | ||
8489eb67 RS |
1195 | /* Return the position across COUNT words from FROM. |
1196 | If that many words cannot be found before the end of the buffer, return 0. | |
1197 | COUNT negative means scan backward and stop at word beginning. */ | |
1198 | ||
dfcf069d | 1199 | int |
8489eb67 RS |
1200 | scan_words (from, count) |
1201 | register int from, count; | |
1202 | { | |
1203 | register int beg = BEGV; | |
1204 | register int end = ZV; | |
6a140a74 | 1205 | register int from_byte = CHAR_TO_BYTE (from); |
93da5fff KH |
1206 | register enum syntaxcode code; |
1207 | int ch0, ch1; | |
8489eb67 RS |
1208 | |
1209 | immediate_quit = 1; | |
1210 | QUIT; | |
1211 | ||
195d1361 RS |
1212 | SETUP_SYNTAX_TABLE (from, count); |
1213 | ||
8489eb67 RS |
1214 | while (count > 0) |
1215 | { | |
1216 | while (1) | |
1217 | { | |
1218 | if (from == end) | |
1219 | { | |
1220 | immediate_quit = 0; | |
1221 | return 0; | |
1222 | } | |
195d1361 | 1223 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
6a140a74 | 1224 | ch0 = FETCH_CHAR (from_byte); |
93da5fff | 1225 | code = SYNTAX (ch0); |
6a140a74 | 1226 | INC_BOTH (from, from_byte); |
8489eb67 RS |
1227 | if (words_include_escapes |
1228 | && (code == Sescape || code == Scharquote)) | |
1229 | break; | |
1230 | if (code == Sword) | |
1231 | break; | |
8489eb67 | 1232 | } |
93da5fff KH |
1233 | /* Now CH0 is a character which begins a word and FROM is the |
1234 | position of the next character. */ | |
8489eb67 RS |
1235 | while (1) |
1236 | { | |
1237 | if (from == end) break; | |
195d1361 | 1238 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
6a140a74 | 1239 | ch1 = FETCH_CHAR (from_byte); |
93da5fff | 1240 | code = SYNTAX (ch1); |
8489eb67 RS |
1241 | if (!(words_include_escapes |
1242 | && (code == Sescape || code == Scharquote))) | |
93da5fff | 1243 | if (code != Sword || WORD_BOUNDARY_P (ch0, ch1)) |
8489eb67 | 1244 | break; |
6a140a74 | 1245 | INC_BOTH (from, from_byte); |
93da5fff | 1246 | ch0 = ch1; |
8489eb67 RS |
1247 | } |
1248 | count--; | |
1249 | } | |
1250 | while (count < 0) | |
1251 | { | |
1252 | while (1) | |
1253 | { | |
1254 | if (from == beg) | |
1255 | { | |
1256 | immediate_quit = 0; | |
1257 | return 0; | |
1258 | } | |
6a140a74 | 1259 | DEC_BOTH (from, from_byte); |
195d1361 | 1260 | UPDATE_SYNTAX_TABLE_BACKWARD (from); |
6a140a74 | 1261 | ch1 = FETCH_CHAR (from_byte); |
93da5fff | 1262 | code = SYNTAX (ch1); |
8489eb67 RS |
1263 | if (words_include_escapes |
1264 | && (code == Sescape || code == Scharquote)) | |
1265 | break; | |
1266 | if (code == Sword) | |
1267 | break; | |
8489eb67 | 1268 | } |
93da5fff KH |
1269 | /* Now CH1 is a character which ends a word and FROM is the |
1270 | position of it. */ | |
8489eb67 RS |
1271 | while (1) |
1272 | { | |
6a140a74 RS |
1273 | int temp_byte; |
1274 | ||
1275 | if (from == beg) | |
1276 | break; | |
1277 | temp_byte = dec_bytepos (from_byte); | |
195d1361 | 1278 | UPDATE_SYNTAX_TABLE_BACKWARD (from); |
6a140a74 | 1279 | ch0 = FETCH_CHAR (temp_byte); |
93da5fff | 1280 | code = SYNTAX (ch0); |
8489eb67 RS |
1281 | if (!(words_include_escapes |
1282 | && (code == Sescape || code == Scharquote))) | |
93da5fff | 1283 | if (code != Sword || WORD_BOUNDARY_P (ch0, ch1)) |
8489eb67 | 1284 | break; |
6a140a74 | 1285 | DEC_BOTH (from, from_byte); |
93da5fff | 1286 | ch1 = ch0; |
8489eb67 RS |
1287 | } |
1288 | count++; | |
1289 | } | |
1290 | ||
1291 | immediate_quit = 0; | |
1292 | ||
1293 | return from; | |
1294 | } | |
1295 | ||
29e16385 | 1296 | DEFUN ("forward-word", Fforward_word, Sforward_word, 0, 1, "p", |
fdb82f93 PJ |
1297 | doc: /* Move point forward ARG words (backward if ARG is negative). |
1298 | Normally returns t. | |
1299 | If an edge of the buffer or a field boundary is reached, point is left there | |
1300 | and the function returns nil. Field boundaries are not noticed if | |
1301 | `inhibit-field-text-motion' is non-nil. */) | |
29e16385 RS |
1302 | (arg) |
1303 | Lisp_Object arg; | |
8489eb67 | 1304 | { |
c096ae4d | 1305 | Lisp_Object tmp; |
2c6ea900 | 1306 | int orig_val, val; |
8489eb67 | 1307 | |
29e16385 RS |
1308 | if (NILP (arg)) |
1309 | XSETFASTINT (arg, 1); | |
1310 | else | |
1311 | CHECK_NUMBER (arg); | |
1312 | ||
1313 | val = orig_val = scan_words (PT, XINT (arg)); | |
2c6ea900 | 1314 | if (! orig_val) |
29e16385 | 1315 | val = XINT (arg) > 0 ? ZV : BEGV; |
5878ee6f | 1316 | |
b8855607 | 1317 | /* Avoid jumping out of an input field. */ |
c096ae4d SM |
1318 | tmp = Fconstrain_to_field (make_number (val), make_number (PT), |
1319 | Qt, Qnil, Qnil); | |
1320 | val = XFASTINT (tmp); | |
7d0393cf | 1321 | |
8489eb67 | 1322 | SET_PT (val); |
e6d8341f | 1323 | return val == orig_val ? Qt : Qnil; |
8489eb67 RS |
1324 | } |
1325 | \f | |
195d1361 RS |
1326 | Lisp_Object skip_chars (); |
1327 | ||
1328 | DEFUN ("skip-chars-forward", Fskip_chars_forward, Sskip_chars_forward, 1, 2, 0, | |
fdb82f93 PJ |
1329 | doc: /* Move point forward, stopping before a char not in STRING, or at pos LIM. |
1330 | STRING is like the inside of a `[...]' in a regular expression | |
1331 | except that `]' is never special and `\\' quotes `^', `-' or `\\' | |
1332 | (but not as the end of a range; quoting is never needed there). | |
1333 | Thus, with arg "a-zA-Z", this skips letters stopping before first nonletter. | |
1334 | With arg "^a-zA-Z", skips nonletters stopping before first letter. | |
a1bc88d4 RS |
1335 | Char classes, e.g. `[:alpha:]', are supported. |
1336 | ||
1337 | Returns the distance traveled, either zero or positive. */) | |
fdb82f93 | 1338 | (string, lim) |
195d1361 RS |
1339 | Lisp_Object string, lim; |
1340 | { | |
a1bc88d4 | 1341 | return skip_chars (1, 0, string, lim, 1); |
195d1361 RS |
1342 | } |
1343 | ||
1344 | DEFUN ("skip-chars-backward", Fskip_chars_backward, Sskip_chars_backward, 1, 2, 0, | |
fdb82f93 PJ |
1345 | doc: /* Move point backward, stopping after a char not in STRING, or at pos LIM. |
1346 | See `skip-chars-forward' for details. | |
1347 | Returns the distance traveled, either zero or negative. */) | |
1348 | (string, lim) | |
195d1361 RS |
1349 | Lisp_Object string, lim; |
1350 | { | |
a1bc88d4 | 1351 | return skip_chars (0, 0, string, lim, 1); |
195d1361 RS |
1352 | } |
1353 | ||
1354 | DEFUN ("skip-syntax-forward", Fskip_syntax_forward, Sskip_syntax_forward, 1, 2, 0, | |
fdb82f93 PJ |
1355 | doc: /* Move point forward across chars in specified syntax classes. |
1356 | SYNTAX is a string of syntax code characters. | |
1357 | Stop before a char whose syntax is not in SYNTAX, or at position LIM. | |
1358 | If SYNTAX starts with ^, skip characters whose syntax is NOT in SYNTAX. | |
1359 | This function returns the distance traveled, either zero or positive. */) | |
1360 | (syntax, lim) | |
195d1361 RS |
1361 | Lisp_Object syntax, lim; |
1362 | { | |
a1bc88d4 | 1363 | return skip_chars (1, 1, syntax, lim, 0); |
195d1361 RS |
1364 | } |
1365 | ||
1366 | DEFUN ("skip-syntax-backward", Fskip_syntax_backward, Sskip_syntax_backward, 1, 2, 0, | |
fdb82f93 PJ |
1367 | doc: /* Move point backward across chars in specified syntax classes. |
1368 | SYNTAX is a string of syntax code characters. | |
1369 | Stop on reaching a char whose syntax is not in SYNTAX, or at position LIM. | |
1370 | If SYNTAX starts with ^, skip characters whose syntax is NOT in SYNTAX. | |
1371 | This function returns the distance traveled, either zero or negative. */) | |
1372 | (syntax, lim) | |
195d1361 RS |
1373 | Lisp_Object syntax, lim; |
1374 | { | |
a1bc88d4 | 1375 | return skip_chars (0, 1, syntax, lim, 0); |
195d1361 RS |
1376 | } |
1377 | ||
6a140a74 | 1378 | static Lisp_Object |
a1bc88d4 | 1379 | skip_chars (forwardp, syntaxp, string, lim, handle_iso_classes) |
195d1361 RS |
1380 | int forwardp, syntaxp; |
1381 | Lisp_Object string, lim; | |
a1bc88d4 | 1382 | int handle_iso_classes; |
195d1361 | 1383 | { |
195d1361 RS |
1384 | register unsigned int c; |
1385 | unsigned char fastmap[0400]; | |
7e68b0ea | 1386 | /* If SYNTAXP is 0, STRING may contain multi-byte form of characters |
9690d026 KH |
1387 | of which codes don't fit in FASTMAP. In that case, set the |
1388 | ranges of characters in CHAR_RANGES. */ | |
5df4982e | 1389 | int *char_ranges; |
7e68b0ea | 1390 | int n_char_ranges = 0; |
195d1361 | 1391 | int negate = 0; |
4101e6fe | 1392 | register int i, i_byte; |
7e68b0ea | 1393 | int multibyte = !NILP (current_buffer->enable_multibyte_characters); |
1674d9a2 RS |
1394 | int string_multibyte; |
1395 | int size_byte; | |
2e567bd3 | 1396 | const unsigned char *str; |
82d497fc | 1397 | int len; |
a1bc88d4 | 1398 | Lisp_Object iso_classes; |
195d1361 | 1399 | |
b7826503 | 1400 | CHECK_STRING (string); |
d5db4077 | 1401 | char_ranges = (int *) alloca (SCHARS (string) * (sizeof (int)) * 2); |
1674d9a2 | 1402 | string_multibyte = STRING_MULTIBYTE (string); |
d5db4077 KR |
1403 | str = SDATA (string); |
1404 | size_byte = SBYTES (string); | |
a1bc88d4 | 1405 | iso_classes = Qnil; |
195d1361 | 1406 | |
82d497fc KH |
1407 | /* Adjust the multibyteness of the string to that of the buffer. */ |
1408 | if (multibyte != string_multibyte) | |
1409 | { | |
1410 | int nbytes; | |
1411 | ||
1412 | if (multibyte) | |
d5db4077 KR |
1413 | nbytes = count_size_as_multibyte (SDATA (string), |
1414 | SCHARS (string)); | |
82d497fc | 1415 | else |
d5db4077 | 1416 | nbytes = SCHARS (string); |
82d497fc KH |
1417 | if (nbytes != size_byte) |
1418 | { | |
2e567bd3 KR |
1419 | unsigned char *tmp = (unsigned char *) alloca (nbytes); |
1420 | copy_text (SDATA (string), tmp, size_byte, | |
82d497fc KH |
1421 | string_multibyte, multibyte); |
1422 | size_byte = nbytes; | |
2e567bd3 | 1423 | str = tmp; |
82d497fc KH |
1424 | } |
1425 | } | |
1426 | ||
195d1361 RS |
1427 | if (NILP (lim)) |
1428 | XSETINT (lim, forwardp ? ZV : BEGV); | |
1429 | else | |
b7826503 | 1430 | CHECK_NUMBER_COERCE_MARKER (lim); |
195d1361 RS |
1431 | |
1432 | /* In any case, don't allow scan outside bounds of buffer. */ | |
195d1361 RS |
1433 | if (XINT (lim) > ZV) |
1434 | XSETFASTINT (lim, ZV); | |
1435 | if (XINT (lim) < BEGV) | |
1436 | XSETFASTINT (lim, BEGV); | |
1437 | ||
195d1361 RS |
1438 | bzero (fastmap, sizeof fastmap); |
1439 | ||
82d497fc | 1440 | i_byte = 0; |
4101e6fe | 1441 | |
13090112 | 1442 | if (i_byte < size_byte |
d5db4077 | 1443 | && SREF (string, 0) == '^') |
195d1361 | 1444 | { |
82d497fc | 1445 | negate = 1; i_byte++; |
195d1361 RS |
1446 | } |
1447 | ||
1448 | /* Find the characters specified and set their elements of fastmap. | |
1449 | If syntaxp, each character counts as itself. | |
1450 | Otherwise, handle backslashes and ranges specially. */ | |
1451 | ||
13090112 | 1452 | while (i_byte < size_byte) |
195d1361 | 1453 | { |
82d497fc KH |
1454 | c = STRING_CHAR_AND_LENGTH (str + i_byte, size_byte - i_byte, len); |
1455 | i_byte += len; | |
4101e6fe | 1456 | |
195d1361 | 1457 | if (syntaxp) |
4101e6fe | 1458 | fastmap[syntax_spec_code[c & 0377]] = 1; |
195d1361 RS |
1459 | else |
1460 | { | |
a1bc88d4 RS |
1461 | if (handle_iso_classes && c == '[' |
1462 | && i_byte < size_byte | |
1463 | && STRING_CHAR (str + i_byte, size_byte - i_byte) == ':') | |
1464 | { | |
1465 | const unsigned char *class_beg = str + i_byte + 1; | |
1466 | const unsigned char *class_end = class_beg; | |
b3bda4fd | 1467 | const unsigned char *class_limit = str + size_byte - 2; |
a1bc88d4 RS |
1468 | /* Leave room for the null. */ |
1469 | unsigned char class_name[CHAR_CLASS_MAX_LENGTH + 1]; | |
1470 | re_wctype_t cc; | |
1471 | ||
1472 | if (class_limit - class_beg > CHAR_CLASS_MAX_LENGTH) | |
1473 | class_limit = class_beg + CHAR_CLASS_MAX_LENGTH; | |
1474 | ||
b3bda4fd KS |
1475 | while (class_end < class_limit |
1476 | && *class_end >= 'a' && *class_end <= 'z') | |
a1bc88d4 RS |
1477 | class_end++; |
1478 | ||
b3bda4fd KS |
1479 | if (class_end == class_beg |
1480 | || *class_end != ':' || class_end[1] != ']') | |
1481 | goto not_a_class_name; | |
a1bc88d4 RS |
1482 | |
1483 | bcopy (class_beg, class_name, class_end - class_beg); | |
1484 | class_name[class_end - class_beg] = 0; | |
1485 | ||
1486 | cc = re_wctype (class_name); | |
1487 | if (cc == 0) | |
1488 | error ("Invalid ISO C character class"); | |
1489 | ||
1490 | iso_classes = Fcons (make_number (cc), iso_classes); | |
1491 | ||
1492 | i_byte = class_end + 2 - str; | |
1493 | continue; | |
1494 | } | |
1495 | ||
b3bda4fd | 1496 | not_a_class_name: |
195d1361 RS |
1497 | if (c == '\\') |
1498 | { | |
13090112 | 1499 | if (i_byte == size_byte) |
4101e6fe RS |
1500 | break; |
1501 | ||
57951c2e AS |
1502 | c = STRING_CHAR_AND_LENGTH (str + i_byte, |
1503 | size_byte - i_byte, len); | |
82d497fc | 1504 | i_byte += len; |
195d1361 | 1505 | } |
57951c2e AS |
1506 | /* Treat `-' as range character only if another character |
1507 | follows. */ | |
1508 | if (i_byte + 1 < size_byte | |
82d497fc | 1509 | && str[i_byte] == '-') |
195d1361 | 1510 | { |
9690d026 | 1511 | unsigned int c2; |
4101e6fe RS |
1512 | |
1513 | /* Skip over the dash. */ | |
82d497fc | 1514 | i_byte++; |
4101e6fe | 1515 | |
4101e6fe | 1516 | /* Get the end of the range. */ |
57951c2e AS |
1517 | c2 = STRING_CHAR_AND_LENGTH (str + i_byte, |
1518 | size_byte - i_byte, len); | |
82d497fc | 1519 | i_byte += len; |
7e68b0ea | 1520 | |
4101e6fe | 1521 | if (SINGLE_BYTE_CHAR_P (c)) |
06274af5 KH |
1522 | { |
1523 | if (! SINGLE_BYTE_CHAR_P (c2)) | |
e39091b6 | 1524 | { |
7ae339a7 KH |
1525 | /* Handle a range starting with a character of |
1526 | less than 256, and ending with a character of | |
1527 | not less than 256. Split that into two | |
1528 | ranges, the low one ending at 0377, and the | |
1529 | high one starting at the smallest character | |
1530 | in the charset of C2 and ending at C2. */ | |
e39091b6 KH |
1531 | int charset = CHAR_CHARSET (c2); |
1532 | int c1 = MAKE_CHAR (charset, 0, 0); | |
1533 | ||
e39091b6 KH |
1534 | char_ranges[n_char_ranges++] = c1; |
1535 | char_ranges[n_char_ranges++] = c2; | |
465cf84c | 1536 | c2 = 0377; |
e39091b6 | 1537 | } |
06274af5 KH |
1538 | while (c <= c2) |
1539 | { | |
1540 | fastmap[c] = 1; | |
1541 | c++; | |
1542 | } | |
1543 | } | |
9690d026 | 1544 | else if (c <= c2) /* Both C and C2 are multibyte char. */ |
195d1361 | 1545 | { |
9690d026 KH |
1546 | char_ranges[n_char_ranges++] = c; |
1547 | char_ranges[n_char_ranges++] = c2; | |
195d1361 | 1548 | } |
195d1361 RS |
1549 | } |
1550 | else | |
7e68b0ea | 1551 | { |
e39091b6 KH |
1552 | if (SINGLE_BYTE_CHAR_P (c)) |
1553 | fastmap[c] = 1; | |
1554 | else | |
7e68b0ea | 1555 | { |
4101e6fe RS |
1556 | char_ranges[n_char_ranges++] = c; |
1557 | char_ranges[n_char_ranges++] = c; | |
7e68b0ea RS |
1558 | } |
1559 | } | |
195d1361 RS |
1560 | } |
1561 | } | |
1562 | ||
9690d026 | 1563 | /* If ^ was the first character, complement the fastmap. */ |
195d1361 RS |
1564 | if (negate) |
1565 | for (i = 0; i < sizeof fastmap; i++) | |
9690d026 | 1566 | fastmap[i] ^= 1; |
195d1361 RS |
1567 | |
1568 | { | |
1569 | int start_point = PT; | |
1570 | int pos = PT; | |
6a140a74 | 1571 | int pos_byte = PT_BYTE; |
9af7511a KH |
1572 | unsigned char *p = PT_ADDR, *endp, *stop; |
1573 | ||
1574 | if (forwardp) | |
1575 | { | |
1576 | endp = (XINT (lim) == GPT) ? GPT_ADDR : CHAR_POS_ADDR (XINT (lim)); | |
d7ee9fab | 1577 | stop = (pos < GPT && GPT < XINT (lim)) ? GPT_ADDR : endp; |
9af7511a KH |
1578 | } |
1579 | else | |
1580 | { | |
1581 | endp = CHAR_POS_ADDR (XINT (lim)); | |
d7ee9fab | 1582 | stop = (pos >= GPT && GPT > XINT (lim)) ? GAP_END_ADDR : endp; |
9af7511a | 1583 | } |
195d1361 RS |
1584 | |
1585 | immediate_quit = 1; | |
1586 | if (syntaxp) | |
1587 | { | |
1588 | SETUP_SYNTAX_TABLE (pos, forwardp ? 1 : -1); | |
1589 | if (forwardp) | |
1590 | { | |
7e68b0ea | 1591 | if (multibyte) |
9af7511a KH |
1592 | while (1) |
1593 | { | |
1594 | int nbytes; | |
1595 | ||
1596 | if (p >= stop) | |
ee0cdb48 | 1597 | { |
9af7511a KH |
1598 | if (p >= endp) |
1599 | break; | |
1600 | p = GAP_END_ADDR; | |
1601 | stop = endp; | |
ee0cdb48 | 1602 | } |
9af7511a KH |
1603 | c = STRING_CHAR_AND_LENGTH (p, MAX_MULTIBYTE_LENGTH, nbytes); |
1604 | if (! fastmap[(int) SYNTAX (c)]) | |
1605 | break; | |
1606 | p += nbytes, pos++, pos_byte += nbytes; | |
1607 | UPDATE_SYNTAX_TABLE_FORWARD (pos); | |
1608 | } | |
7e68b0ea | 1609 | else |
9af7511a KH |
1610 | while (1) |
1611 | { | |
1612 | if (p >= stop) | |
1613 | { | |
1614 | if (p >= endp) | |
1615 | break; | |
1616 | p = GAP_END_ADDR; | |
1617 | stop = endp; | |
1618 | } | |
1619 | if (! fastmap[(int) SYNTAX (*p)]) | |
1620 | break; | |
1621 | p++, pos++; | |
1622 | UPDATE_SYNTAX_TABLE_FORWARD (pos); | |
1623 | } | |
195d1361 RS |
1624 | } |
1625 | else | |
1626 | { | |
7e68b0ea | 1627 | if (multibyte) |
9af7511a KH |
1628 | while (1) |
1629 | { | |
1630 | unsigned char *prev_p; | |
1631 | int nbytes; | |
1632 | ||
1633 | if (p <= stop) | |
1634 | { | |
1635 | if (p <= endp) | |
7e68b0ea | 1636 | break; |
9af7511a KH |
1637 | p = GPT_ADDR; |
1638 | stop = endp; | |
1639 | } | |
1640 | prev_p = p; | |
1641 | while (--p >= stop && ! CHAR_HEAD_P (*p)); | |
1642 | PARSE_MULTIBYTE_SEQ (p, MAX_MULTIBYTE_LENGTH, nbytes); | |
1643 | if (prev_p - p > nbytes) | |
1644 | p = prev_p - 1, c = *p, nbytes = 1; | |
1645 | else | |
1646 | c = STRING_CHAR (p, MAX_MULTIBYTE_LENGTH); | |
1647 | pos--, pos_byte -= nbytes; | |
1648 | UPDATE_SYNTAX_TABLE_BACKWARD (pos); | |
1649 | if (! fastmap[(int) SYNTAX (c)]) | |
1650 | { | |
1651 | pos++; | |
1652 | pos_byte += nbytes; | |
1653 | break; | |
1654 | } | |
1655 | } | |
7e68b0ea | 1656 | else |
9af7511a KH |
1657 | while (1) |
1658 | { | |
1659 | if (p <= stop) | |
ee0cdb48 | 1660 | { |
9af7511a | 1661 | if (p <= endp) |
4c8535eb | 1662 | break; |
9af7511a KH |
1663 | p = GPT_ADDR; |
1664 | stop = endp; | |
ee0cdb48 | 1665 | } |
9af7511a KH |
1666 | if (! fastmap[(int) SYNTAX (p[-1])]) |
1667 | break; | |
1668 | p--, pos--; | |
1669 | UPDATE_SYNTAX_TABLE_BACKWARD (pos - 1); | |
1670 | } | |
195d1361 RS |
1671 | } |
1672 | } | |
1673 | else | |
1674 | { | |
1675 | if (forwardp) | |
1676 | { | |
7e68b0ea | 1677 | if (multibyte) |
9af7511a | 1678 | while (1) |
7e68b0ea | 1679 | { |
9af7511a KH |
1680 | int nbytes; |
1681 | ||
1682 | if (p >= stop) | |
1683 | { | |
1684 | if (p >= endp) | |
1685 | break; | |
1686 | p = GAP_END_ADDR; | |
1687 | stop = endp; | |
1688 | } | |
1689 | c = STRING_CHAR_AND_LENGTH (p, MAX_MULTIBYTE_LENGTH, nbytes); | |
a1bc88d4 RS |
1690 | |
1691 | if (! NILP (iso_classes) && in_classes (c, iso_classes)) | |
1692 | { | |
1693 | if (negate) | |
1694 | break; | |
1695 | else | |
1696 | goto fwd_ok; | |
1697 | } | |
1698 | ||
9690d026 | 1699 | if (SINGLE_BYTE_CHAR_P (c)) |
7e68b0ea | 1700 | { |
9690d026 KH |
1701 | if (!fastmap[c]) |
1702 | break; | |
1703 | } | |
1704 | else | |
1705 | { | |
1706 | /* If we are looking at a multibyte character, | |
1707 | we must look up the character in the table | |
1708 | CHAR_RANGES. If there's no data in the | |
1709 | table, that character is not what we want to | |
1710 | skip. */ | |
1711 | ||
e39091b6 KH |
1712 | /* The following code do the right thing even if |
1713 | n_char_ranges is zero (i.e. no data in | |
1714 | CHAR_RANGES). */ | |
7e68b0ea | 1715 | for (i = 0; i < n_char_ranges; i += 2) |
e39091b6 | 1716 | if (c >= char_ranges[i] && c <= char_ranges[i + 1]) |
7e68b0ea RS |
1717 | break; |
1718 | if (!(negate ^ (i < n_char_ranges))) | |
1719 | break; | |
7e68b0ea | 1720 | } |
a1bc88d4 | 1721 | fwd_ok: |
9af7511a | 1722 | p += nbytes, pos++, pos_byte += nbytes; |
7e68b0ea RS |
1723 | } |
1724 | else | |
9af7511a KH |
1725 | while (1) |
1726 | { | |
1727 | if (p >= stop) | |
1728 | { | |
1729 | if (p >= endp) | |
1730 | break; | |
1731 | p = GAP_END_ADDR; | |
1732 | stop = endp; | |
1733 | } | |
a1bc88d4 RS |
1734 | |
1735 | if (!NILP (iso_classes) && in_classes (*p, iso_classes)) | |
1736 | { | |
1737 | if (negate) | |
1738 | break; | |
1739 | else | |
1ad6e4db | 1740 | goto fwd_unibyte_ok; |
a1bc88d4 RS |
1741 | } |
1742 | ||
4e837cd0 | 1743 | if (!fastmap[*p]) |
9af7511a | 1744 | break; |
1ad6e4db | 1745 | fwd_unibyte_ok: |
9af7511a KH |
1746 | p++, pos++; |
1747 | } | |
195d1361 RS |
1748 | } |
1749 | else | |
1750 | { | |
7e68b0ea | 1751 | if (multibyte) |
9af7511a | 1752 | while (1) |
7e68b0ea | 1753 | { |
9af7511a KH |
1754 | unsigned char *prev_p; |
1755 | int nbytes; | |
e39091b6 | 1756 | |
9af7511a KH |
1757 | if (p <= stop) |
1758 | { | |
1759 | if (p <= endp) | |
1760 | break; | |
1761 | p = GPT_ADDR; | |
1762 | stop = endp; | |
1763 | } | |
1764 | prev_p = p; | |
1765 | while (--p >= stop && ! CHAR_HEAD_P (*p)); | |
1766 | PARSE_MULTIBYTE_SEQ (p, MAX_MULTIBYTE_LENGTH, nbytes); | |
1767 | if (prev_p - p > nbytes) | |
1768 | p = prev_p - 1, c = *p, nbytes = 1; | |
1769 | else | |
1770 | c = STRING_CHAR (p, MAX_MULTIBYTE_LENGTH); | |
a1bc88d4 RS |
1771 | |
1772 | if (! NILP (iso_classes) && in_classes (c, iso_classes)) | |
1773 | { | |
1774 | if (negate) | |
1775 | break; | |
1776 | else | |
1777 | goto back_ok; | |
1778 | } | |
1779 | ||
9690d026 KH |
1780 | if (SINGLE_BYTE_CHAR_P (c)) |
1781 | { | |
1782 | if (!fastmap[c]) | |
1783 | break; | |
1784 | } | |
1785 | else | |
7e68b0ea | 1786 | { |
9690d026 | 1787 | /* See the comment in the previous similar code. */ |
e39091b6 KH |
1788 | for (i = 0; i < n_char_ranges; i += 2) |
1789 | if (c >= char_ranges[i] && c <= char_ranges[i + 1]) | |
1790 | break; | |
1791 | if (!(negate ^ (i < n_char_ranges))) | |
1792 | break; | |
7e68b0ea | 1793 | } |
a1bc88d4 | 1794 | back_ok: |
9af7511a | 1795 | pos--, pos_byte -= nbytes; |
7e68b0ea RS |
1796 | } |
1797 | else | |
9af7511a KH |
1798 | while (1) |
1799 | { | |
1800 | if (p <= stop) | |
1801 | { | |
1802 | if (p <= endp) | |
1803 | break; | |
1804 | p = GPT_ADDR; | |
1805 | stop = endp; | |
1806 | } | |
a1bc88d4 RS |
1807 | |
1808 | if (! NILP (iso_classes) && in_classes (p[-1], iso_classes)) | |
1809 | { | |
1810 | if (negate) | |
1811 | break; | |
1812 | else | |
1ad6e4db | 1813 | goto back_unibyte_ok; |
a1bc88d4 RS |
1814 | } |
1815 | ||
4e837cd0 | 1816 | if (!fastmap[p[-1]]) |
9af7511a | 1817 | break; |
1ad6e4db | 1818 | back_unibyte_ok: |
9af7511a KH |
1819 | p--, pos--; |
1820 | } | |
195d1361 RS |
1821 | } |
1822 | } | |
7e68b0ea | 1823 | |
6a140a74 RS |
1824 | #if 0 /* Not needed now that a position in mid-character |
1825 | cannot be specified in Lisp. */ | |
7e68b0ea RS |
1826 | if (multibyte |
1827 | /* INC_POS or DEC_POS might have moved POS over LIM. */ | |
1828 | && (forwardp ? (pos > XINT (lim)) : (pos < XINT (lim)))) | |
1829 | pos = XINT (lim); | |
6a140a74 | 1830 | #endif |
7e68b0ea | 1831 | |
6a140a74 RS |
1832 | if (! multibyte) |
1833 | pos_byte = pos; | |
1834 | ||
1835 | SET_PT_BOTH (pos, pos_byte); | |
195d1361 RS |
1836 | immediate_quit = 0; |
1837 | ||
1838 | return make_number (PT - start_point); | |
1839 | } | |
1840 | } | |
a1bc88d4 RS |
1841 | |
1842 | /* Return 1 if character C belongs to one of the ISO classes | |
1843 | in the list ISO_CLASSES. Each class is represented by an | |
1844 | integer which is its type according to re_wctype. */ | |
1845 | ||
1846 | static int | |
1847 | in_classes (c, iso_classes) | |
1848 | int c; | |
1849 | Lisp_Object iso_classes; | |
1850 | { | |
1851 | int fits_class = 0; | |
1852 | ||
1853 | while (! NILP (iso_classes)) | |
1854 | { | |
1855 | Lisp_Object elt; | |
1856 | elt = XCAR (iso_classes); | |
1857 | iso_classes = XCDR (iso_classes); | |
1858 | ||
1859 | if (re_iswctype (c, XFASTINT (elt))) | |
1860 | fits_class = 1; | |
1861 | } | |
1862 | ||
1863 | return fits_class; | |
1864 | } | |
195d1361 | 1865 | \f |
95ff8dfc RS |
1866 | /* Jump over a comment, assuming we are at the beginning of one. |
1867 | FROM is the current position. | |
1868 | FROM_BYTE is the bytepos corresponding to FROM. | |
1869 | Do not move past STOP (a charpos). | |
1870 | The comment over which we have to jump is of style STYLE | |
1871 | (either SYNTAX_COMMENT_STYLE(foo) or ST_COMMENT_STYLE). | |
1872 | NESTING should be positive to indicate the nesting at the beginning | |
1873 | for nested comments and should be zero or negative else. | |
1874 | ST_COMMENT_STYLE cannot be nested. | |
1875 | PREV_SYNTAX is the SYNTAX_WITH_FLAGS of the previous character | |
1876 | (or 0 If the search cannot start in the middle of a two-character). | |
1877 | ||
1878 | If successful, return 1 and store the charpos of the comment's end | |
1879 | into *CHARPOS_PTR and the corresponding bytepos into *BYTEPOS_PTR. | |
1880 | Else, return 0 and store the charpos STOP into *CHARPOS_PTR, the | |
1881 | corresponding bytepos into *BYTEPOS_PTR and the current nesting | |
1882 | (as defined for state.incomment) in *INCOMMENT_PTR. | |
1883 | ||
1884 | The comment end is the last character of the comment rather than the | |
1885 | character just after the comment. | |
1886 | ||
1887 | Global syntax data is assumed to initially be valid for FROM and | |
1888 | remains valid for forward search starting at the returned position. */ | |
1889 | ||
1890 | static int | |
1891 | forw_comment (from, from_byte, stop, nesting, style, prev_syntax, | |
1892 | charpos_ptr, bytepos_ptr, incomment_ptr) | |
a0aa7fcf | 1893 | EMACS_INT from, from_byte, stop; |
95ff8dfc | 1894 | int nesting, style, prev_syntax; |
a0aa7fcf SM |
1895 | EMACS_INT *charpos_ptr, *bytepos_ptr; |
1896 | int *incomment_ptr; | |
95ff8dfc RS |
1897 | { |
1898 | register int c, c1; | |
1899 | register enum syntaxcode code; | |
1900 | register int syntax; | |
1901 | ||
1902 | if (nesting <= 0) nesting = -1; | |
1903 | ||
1904 | /* Enter the loop in the middle so that we find | |
1905 | a 2-char comment ender if we start in the middle of it. */ | |
1906 | syntax = prev_syntax; | |
1907 | if (syntax != 0) goto forw_incomment; | |
1908 | ||
1909 | while (1) | |
1910 | { | |
1911 | if (from == stop) | |
1912 | { | |
1913 | *incomment_ptr = nesting; | |
1914 | *charpos_ptr = from; | |
1915 | *bytepos_ptr = from_byte; | |
1916 | return 0; | |
1917 | } | |
1918 | c = FETCH_CHAR (from_byte); | |
1919 | syntax = SYNTAX_WITH_FLAGS (c); | |
1920 | code = syntax & 0xff; | |
1921 | if (code == Sendcomment | |
1922 | && SYNTAX_FLAGS_COMMENT_STYLE (syntax) == style | |
abf8a9ff SM |
1923 | && (SYNTAX_FLAGS_COMMENT_NESTED (syntax) ? |
1924 | (nesting > 0 && --nesting == 0) : nesting < 0)) | |
95ff8dfc RS |
1925 | /* we have encountered a comment end of the same style |
1926 | as the comment sequence which began this comment | |
1927 | section */ | |
1928 | break; | |
1929 | if (code == Scomment_fence | |
1930 | && style == ST_COMMENT_STYLE) | |
1931 | /* we have encountered a comment end of the same style | |
1932 | as the comment sequence which began this comment | |
1933 | section. */ | |
1934 | break; | |
1935 | if (nesting > 0 | |
1936 | && code == Scomment | |
abf8a9ff | 1937 | && SYNTAX_FLAGS_COMMENT_NESTED (syntax) |
95ff8dfc RS |
1938 | && SYNTAX_FLAGS_COMMENT_STYLE (syntax) == style) |
1939 | /* we have encountered a nested comment of the same style | |
1940 | as the comment sequence which began this comment section */ | |
1941 | nesting++; | |
1942 | INC_BOTH (from, from_byte); | |
1943 | UPDATE_SYNTAX_TABLE_FORWARD (from); | |
7d0393cf | 1944 | |
95ff8dfc RS |
1945 | forw_incomment: |
1946 | if (from < stop && SYNTAX_FLAGS_COMEND_FIRST (syntax) | |
1947 | && SYNTAX_FLAGS_COMMENT_STYLE (syntax) == style | |
1948 | && (c1 = FETCH_CHAR (from_byte), | |
abf8a9ff SM |
1949 | SYNTAX_COMEND_SECOND (c1)) |
1950 | && ((SYNTAX_FLAGS_COMMENT_NESTED (syntax) || | |
1951 | SYNTAX_COMMENT_NESTED (c1)) ? nesting > 0 : nesting < 0)) | |
4ffe723b GM |
1952 | { |
1953 | if (--nesting <= 0) | |
1954 | /* we have encountered a comment end of the same style | |
1955 | as the comment sequence which began this comment | |
1956 | section */ | |
1957 | break; | |
1958 | else | |
1959 | { | |
1960 | INC_BOTH (from, from_byte); | |
1961 | UPDATE_SYNTAX_TABLE_FORWARD (from); | |
1962 | } | |
1963 | } | |
95ff8dfc RS |
1964 | if (nesting > 0 |
1965 | && from < stop | |
1966 | && SYNTAX_FLAGS_COMSTART_FIRST (syntax) | |
1967 | && (c1 = FETCH_CHAR (from_byte), | |
1968 | SYNTAX_COMMENT_STYLE (c1) == style | |
abf8a9ff SM |
1969 | && SYNTAX_COMSTART_SECOND (c1)) |
1970 | && (SYNTAX_FLAGS_COMMENT_NESTED (syntax) || | |
1971 | SYNTAX_COMMENT_NESTED (c1))) | |
95ff8dfc RS |
1972 | /* we have encountered a nested comment of the same style |
1973 | as the comment sequence which began this comment | |
1974 | section */ | |
1975 | { | |
1976 | INC_BOTH (from, from_byte); | |
1977 | UPDATE_SYNTAX_TABLE_FORWARD (from); | |
1978 | nesting++; | |
1979 | } | |
1980 | } | |
1981 | *charpos_ptr = from; | |
1982 | *bytepos_ptr = from_byte; | |
1983 | return 1; | |
1984 | } | |
1985 | ||
b3cfe0c8 | 1986 | DEFUN ("forward-comment", Fforward_comment, Sforward_comment, 1, 1, 0, |
177c0ea7 | 1987 | doc: /* |
ee648c11 | 1988 | Move forward across up to COUNT comments. If COUNT is negative, move backward. |
fdb82f93 PJ |
1989 | Stop scanning if we find something other than a comment or whitespace. |
1990 | Set point to where scanning stops. | |
ee648c11 | 1991 | If COUNT comments are found as expected, with nothing except whitespace |
fdb82f93 PJ |
1992 | between them, return t; otherwise return nil. */) |
1993 | (count) | |
840f481c | 1994 | Lisp_Object count; |
b3cfe0c8 | 1995 | { |
2312c580 SM |
1996 | register EMACS_INT from; |
1997 | EMACS_INT from_byte; | |
1998 | register EMACS_INT stop; | |
8ea151b2 | 1999 | register int c, c1; |
b3cfe0c8 RS |
2000 | register enum syntaxcode code; |
2001 | int comstyle = 0; /* style of comment encountered */ | |
95ff8dfc | 2002 | int comnested = 0; /* whether the comment is nestable or not */ |
be720845 | 2003 | int found; |
2312c580 SM |
2004 | EMACS_INT count1; |
2005 | EMACS_INT out_charpos, out_bytepos; | |
95ff8dfc | 2006 | int dummy; |
840f481c | 2007 | |
b7826503 | 2008 | CHECK_NUMBER (count); |
840f481c | 2009 | count1 = XINT (count); |
195d1361 | 2010 | stop = count1 > 0 ? ZV : BEGV; |
b3cfe0c8 RS |
2011 | |
2012 | immediate_quit = 1; | |
2013 | QUIT; | |
2014 | ||
2015 | from = PT; | |
6a140a74 | 2016 | from_byte = PT_BYTE; |
b3cfe0c8 | 2017 | |
195d1361 | 2018 | SETUP_SYNTAX_TABLE (from, count1); |
840f481c | 2019 | while (count1 > 0) |
b3cfe0c8 | 2020 | { |
04882296 | 2021 | do |
b3cfe0c8 | 2022 | { |
f902a008 RS |
2023 | int comstart_first; |
2024 | ||
04882296 KH |
2025 | if (from == stop) |
2026 | { | |
ef316cf0 | 2027 | SET_PT_BOTH (from, from_byte); |
b7e6e612 | 2028 | immediate_quit = 0; |
04882296 KH |
2029 | return Qnil; |
2030 | } | |
6a140a74 | 2031 | c = FETCH_CHAR (from_byte); |
b3cfe0c8 | 2032 | code = SYNTAX (c); |
f902a008 | 2033 | comstart_first = SYNTAX_COMSTART_FIRST (c); |
95ff8dfc | 2034 | comnested = SYNTAX_COMMENT_NESTED (c); |
e6365855 | 2035 | comstyle = SYNTAX_COMMENT_STYLE (c); |
6a140a74 | 2036 | INC_BOTH (from, from_byte); |
f902a008 | 2037 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
f902a008 | 2038 | if (from < stop && comstart_first |
6a140a74 | 2039 | && (c1 = FETCH_CHAR (from_byte), |
8ea151b2 | 2040 | SYNTAX_COMSTART_SECOND (c1))) |
b3cfe0c8 | 2041 | { |
7d0393cf | 2042 | /* We have encountered a comment start sequence and we |
7fc8191e | 2043 | are ignoring all text inside comments. We must record |
b3cfe0c8 RS |
2044 | the comment style this sequence begins so that later, |
2045 | only a comment end of the same style actually ends | |
7fc8191e | 2046 | the comment section. */ |
b3cfe0c8 | 2047 | code = Scomment; |
8ea151b2 | 2048 | comstyle = SYNTAX_COMMENT_STYLE (c1); |
95ff8dfc | 2049 | comnested = comnested || SYNTAX_COMMENT_NESTED (c1); |
6a140a74 | 2050 | INC_BOTH (from, from_byte); |
95ff8dfc | 2051 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
b3cfe0c8 | 2052 | } |
04882296 | 2053 | } |
abf8a9ff | 2054 | while (code == Swhitespace || (code == Sendcomment && c == '\n')); |
6a140a74 | 2055 | |
da71ab91 KH |
2056 | if (code == Scomment_fence) |
2057 | comstyle = ST_COMMENT_STYLE; | |
2058 | else if (code != Scomment) | |
04882296 KH |
2059 | { |
2060 | immediate_quit = 0; | |
6a140a74 | 2061 | DEC_BOTH (from, from_byte); |
ef316cf0 | 2062 | SET_PT_BOTH (from, from_byte); |
04882296 KH |
2063 | return Qnil; |
2064 | } | |
2065 | /* We're at the start of a comment. */ | |
95ff8dfc RS |
2066 | found = forw_comment (from, from_byte, stop, comnested, comstyle, 0, |
2067 | &out_charpos, &out_bytepos, &dummy); | |
2068 | from = out_charpos; from_byte = out_bytepos; | |
2069 | if (!found) | |
04882296 | 2070 | { |
95ff8dfc RS |
2071 | immediate_quit = 0; |
2072 | SET_PT_BOTH (from, from_byte); | |
2073 | return Qnil; | |
b3cfe0c8 | 2074 | } |
95ff8dfc RS |
2075 | INC_BOTH (from, from_byte); |
2076 | UPDATE_SYNTAX_TABLE_FORWARD (from); | |
04882296 | 2077 | /* We have skipped one comment. */ |
840f481c | 2078 | count1--; |
b3cfe0c8 RS |
2079 | } |
2080 | ||
840f481c | 2081 | while (count1 < 0) |
b3cfe0c8 | 2082 | { |
b9145dbb | 2083 | while (1) |
b3cfe0c8 | 2084 | { |
c65adb44 | 2085 | int quoted; |
f902a008 | 2086 | |
b9145dbb RS |
2087 | if (from <= stop) |
2088 | { | |
6a140a74 | 2089 | SET_PT_BOTH (BEGV, BEGV_BYTE); |
b9145dbb RS |
2090 | immediate_quit = 0; |
2091 | return Qnil; | |
2092 | } | |
b3cfe0c8 | 2093 | |
6a140a74 | 2094 | DEC_BOTH (from, from_byte); |
f902a008 | 2095 | /* char_quoted does UPDATE_SYNTAX_TABLE_BACKWARD (from). */ |
6a140a74 | 2096 | quoted = char_quoted (from, from_byte); |
6a140a74 | 2097 | c = FETCH_CHAR (from_byte); |
b3cfe0c8 RS |
2098 | code = SYNTAX (c); |
2099 | comstyle = 0; | |
95ff8dfc | 2100 | comnested = SYNTAX_COMMENT_NESTED (c); |
7fc8191e RS |
2101 | if (code == Sendcomment) |
2102 | comstyle = SYNTAX_COMMENT_STYLE (c); | |
b3cfe0c8 | 2103 | if (from > stop && SYNTAX_COMEND_SECOND (c) |
f902a008 | 2104 | && prev_char_comend_first (from, from_byte) |
89c6809a | 2105 | && !char_quoted (from - 1, dec_bytepos (from_byte))) |
b3cfe0c8 | 2106 | { |
7fc8191e | 2107 | /* We must record the comment style encountered so that |
b3cfe0c8 | 2108 | later, we can match only the proper comment begin |
7fc8191e | 2109 | sequence of the same style. */ |
6a140a74 | 2110 | DEC_BOTH (from, from_byte); |
f902a008 RS |
2111 | code = Sendcomment; |
2112 | /* Calling char_quoted, above, set up global syntax position | |
2113 | at the new value of FROM. */ | |
95ff8dfc RS |
2114 | c1 = FETCH_CHAR (from_byte); |
2115 | comstyle = SYNTAX_COMMENT_STYLE (c1); | |
2116 | comnested = comnested || SYNTAX_COMMENT_NESTED (c1); | |
b3cfe0c8 RS |
2117 | } |
2118 | ||
195d1361 RS |
2119 | if (code == Scomment_fence) |
2120 | { | |
2121 | /* Skip until first preceding unquoted comment_fence. */ | |
6a140a74 | 2122 | int found = 0, ini = from, ini_byte = from_byte; |
7d0393cf | 2123 | |
6a140a74 | 2124 | while (1) |
195d1361 | 2125 | { |
6a140a74 | 2126 | DEC_BOTH (from, from_byte); |
195d1361 | 2127 | UPDATE_SYNTAX_TABLE_BACKWARD (from); |
6a140a74 RS |
2128 | c = FETCH_CHAR (from_byte); |
2129 | if (SYNTAX (c) == Scomment_fence | |
7d0393cf | 2130 | && !char_quoted (from, from_byte)) |
195d1361 | 2131 | { |
7d0393cf | 2132 | found = 1; |
195d1361 RS |
2133 | break; |
2134 | } | |
fcdd4585 SM |
2135 | else if (from == stop) |
2136 | break; | |
195d1361 RS |
2137 | } |
2138 | if (found == 0) | |
2139 | { | |
2140 | from = ini; /* Set point to ini + 1. */ | |
6a140a74 | 2141 | from_byte = ini_byte; |
195d1361 RS |
2142 | goto leave; |
2143 | } | |
39c41ad4 SM |
2144 | else |
2145 | /* We have skipped one comment. */ | |
2146 | break; | |
195d1361 RS |
2147 | } |
2148 | else if (code == Sendcomment) | |
b3cfe0c8 | 2149 | { |
95ff8dfc | 2150 | found = back_comment (from, from_byte, stop, comnested, comstyle, |
6a140a74 | 2151 | &out_charpos, &out_bytepos); |
1aa963c8 SM |
2152 | if (found == -1) |
2153 | { | |
abf8a9ff SM |
2154 | if (c == '\n') |
2155 | /* This end-of-line is not an end-of-comment. | |
2156 | Treat it like a whitespace. | |
2157 | CC-mode (and maybe others) relies on this behavior. */ | |
2158 | ; | |
2159 | else | |
2160 | { | |
2161 | /* Failure: we should go back to the end of this | |
2162 | not-quite-endcomment. */ | |
2163 | if (SYNTAX(c) != code) | |
2164 | /* It was a two-char Sendcomment. */ | |
2165 | INC_BOTH (from, from_byte); | |
2166 | goto leave; | |
2167 | } | |
1aa963c8 | 2168 | } |
2b927d02 | 2169 | else |
abf8a9ff SM |
2170 | { |
2171 | /* We have skipped one comment. */ | |
2172 | from = out_charpos, from_byte = out_bytepos; | |
2173 | break; | |
2174 | } | |
b3cfe0c8 | 2175 | } |
bb0de084 | 2176 | else if (code != Swhitespace || quoted) |
b3cfe0c8 | 2177 | { |
195d1361 | 2178 | leave: |
b3cfe0c8 | 2179 | immediate_quit = 0; |
6a140a74 | 2180 | INC_BOTH (from, from_byte); |
ef316cf0 | 2181 | SET_PT_BOTH (from, from_byte); |
b3cfe0c8 RS |
2182 | return Qnil; |
2183 | } | |
2184 | } | |
2185 | ||
840f481c | 2186 | count1++; |
b3cfe0c8 RS |
2187 | } |
2188 | ||
ef316cf0 | 2189 | SET_PT_BOTH (from, from_byte); |
b3cfe0c8 RS |
2190 | immediate_quit = 0; |
2191 | return Qt; | |
2192 | } | |
2193 | \f | |
bd25db08 | 2194 | /* Return syntax code of character C if C is a single byte character |
db9f48c3 | 2195 | or `multibyte_symbol_p' is zero. Otherwise, return Ssymbol. */ |
bd25db08 KH |
2196 | |
2197 | #define SYNTAX_WITH_MULTIBYTE_CHECK(c) \ | |
2198 | ((SINGLE_BYTE_CHAR_P (c) || !multibyte_symbol_p) \ | |
2199 | ? SYNTAX (c) : Ssymbol) | |
2200 | ||
6a140a74 | 2201 | static Lisp_Object |
8489eb67 | 2202 | scan_lists (from, count, depth, sexpflag) |
932e6895 SM |
2203 | register EMACS_INT from; |
2204 | EMACS_INT count, depth; | |
2205 | int sexpflag; | |
8489eb67 RS |
2206 | { |
2207 | Lisp_Object val; | |
932e6895 | 2208 | register EMACS_INT stop = count > 0 ? ZV : BEGV; |
93da5fff KH |
2209 | register int c, c1; |
2210 | int stringterm; | |
8489eb67 RS |
2211 | int quoted; |
2212 | int mathexit = 0; | |
93da5fff | 2213 | register enum syntaxcode code, temp_code; |
195d1361 | 2214 | int min_depth = depth; /* Err out if depth gets less than this. */ |
e5d4f4dc | 2215 | int comstyle = 0; /* style of comment encountered */ |
95ff8dfc | 2216 | int comnested = 0; /* whether the comment is nestable or not */ |
932e6895 SM |
2217 | EMACS_INT temp_pos; |
2218 | EMACS_INT last_good = from; | |
195d1361 | 2219 | int found; |
932e6895 SM |
2220 | EMACS_INT from_byte; |
2221 | EMACS_INT out_bytepos, out_charpos; | |
95ff8dfc | 2222 | int temp, dummy; |
bd25db08 | 2223 | int multibyte_symbol_p = sexpflag && multibyte_syntax_as_symbol; |
8489eb67 RS |
2224 | |
2225 | if (depth > 0) min_depth = 0; | |
2226 | ||
c3907a7e RS |
2227 | if (from > ZV) from = ZV; |
2228 | if (from < BEGV) from = BEGV; | |
2229 | ||
2230 | from_byte = CHAR_TO_BYTE (from); | |
2231 | ||
8489eb67 RS |
2232 | immediate_quit = 1; |
2233 | QUIT; | |
2234 | ||
195d1361 | 2235 | SETUP_SYNTAX_TABLE (from, count); |
8489eb67 RS |
2236 | while (count > 0) |
2237 | { | |
8489eb67 RS |
2238 | while (from < stop) |
2239 | { | |
f902a008 | 2240 | int comstart_first, prefix; |
195d1361 | 2241 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
6a140a74 | 2242 | c = FETCH_CHAR (from_byte); |
bd25db08 | 2243 | code = SYNTAX_WITH_MULTIBYTE_CHECK (c); |
f902a008 | 2244 | comstart_first = SYNTAX_COMSTART_FIRST (c); |
95ff8dfc | 2245 | comnested = SYNTAX_COMMENT_NESTED (c); |
e6365855 | 2246 | comstyle = SYNTAX_COMMENT_STYLE (c); |
f902a008 | 2247 | prefix = SYNTAX_PREFIX (c); |
7bf5e9e4 RS |
2248 | if (depth == min_depth) |
2249 | last_good = from; | |
6a140a74 | 2250 | INC_BOTH (from, from_byte); |
195d1361 | 2251 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
f902a008 | 2252 | if (from < stop && comstart_first |
ab229fdd | 2253 | && (c = FETCH_CHAR (from_byte), SYNTAX_COMSTART_SECOND (c)) |
8489eb67 | 2254 | && parse_sexp_ignore_comments) |
e5d4f4dc | 2255 | { |
7d0393cf | 2256 | /* we have encountered a comment start sequence and we |
195d1361 | 2257 | are ignoring all text inside comments. We must record |
e5d4f4dc RS |
2258 | the comment style this sequence begins so that later, |
2259 | only a comment end of the same style actually ends | |
2260 | the comment section */ | |
2261 | code = Scomment; | |
95ff8dfc RS |
2262 | c1 = FETCH_CHAR (from_byte); |
2263 | comstyle = SYNTAX_COMMENT_STYLE (c1); | |
2264 | comnested = comnested || SYNTAX_COMMENT_NESTED (c1); | |
6a140a74 | 2265 | INC_BOTH (from, from_byte); |
f902a008 | 2266 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
e5d4f4dc | 2267 | } |
7d0393cf | 2268 | |
f902a008 | 2269 | if (prefix) |
8489eb67 RS |
2270 | continue; |
2271 | ||
0220c518 | 2272 | switch (SWITCH_ENUM_CAST (code)) |
8489eb67 RS |
2273 | { |
2274 | case Sescape: | |
2275 | case Scharquote: | |
2276 | if (from == stop) goto lose; | |
6a140a74 | 2277 | INC_BOTH (from, from_byte); |
8489eb67 RS |
2278 | /* treat following character as a word constituent */ |
2279 | case Sword: | |
2280 | case Ssymbol: | |
2281 | if (depth || !sexpflag) break; | |
195d1361 | 2282 | /* This word counts as a sexp; return at end of it. */ |
8489eb67 RS |
2283 | while (from < stop) |
2284 | { | |
195d1361 | 2285 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
7c7ca3d2 RS |
2286 | |
2287 | /* Some compilers can't handle this inside the switch. */ | |
bd25db08 KH |
2288 | c = FETCH_CHAR (from_byte); |
2289 | temp = SYNTAX_WITH_MULTIBYTE_CHECK (c); | |
7c7ca3d2 | 2290 | switch (temp) |
8489eb67 RS |
2291 | { |
2292 | case Scharquote: | |
2293 | case Sescape: | |
6a140a74 | 2294 | INC_BOTH (from, from_byte); |
8489eb67 RS |
2295 | if (from == stop) goto lose; |
2296 | break; | |
2297 | case Sword: | |
2298 | case Ssymbol: | |
2299 | case Squote: | |
2300 | break; | |
2301 | default: | |
2302 | goto done; | |
2303 | } | |
6a140a74 | 2304 | INC_BOTH (from, from_byte); |
8489eb67 RS |
2305 | } |
2306 | goto done; | |
2307 | ||
195d1361 | 2308 | case Scomment_fence: |
95ff8dfc RS |
2309 | comstyle = ST_COMMENT_STYLE; |
2310 | /* FALLTHROUGH */ | |
2311 | case Scomment: | |
8489eb67 | 2312 | if (!parse_sexp_ignore_comments) break; |
95ff8dfc RS |
2313 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
2314 | found = forw_comment (from, from_byte, stop, | |
2315 | comnested, comstyle, 0, | |
2316 | &out_charpos, &out_bytepos, &dummy); | |
2317 | from = out_charpos, from_byte = out_bytepos; | |
2318 | if (!found) | |
8489eb67 | 2319 | { |
95ff8dfc RS |
2320 | if (depth == 0) |
2321 | goto done; | |
2322 | goto lose; | |
8489eb67 | 2323 | } |
95ff8dfc RS |
2324 | INC_BOTH (from, from_byte); |
2325 | UPDATE_SYNTAX_TABLE_FORWARD (from); | |
8489eb67 RS |
2326 | break; |
2327 | ||
2328 | case Smath: | |
2329 | if (!sexpflag) | |
2330 | break; | |
6a140a74 RS |
2331 | if (from != stop && c == FETCH_CHAR (from_byte)) |
2332 | { | |
2333 | INC_BOTH (from, from_byte); | |
2334 | } | |
8489eb67 RS |
2335 | if (mathexit) |
2336 | { | |
2337 | mathexit = 0; | |
2338 | goto close1; | |
2339 | } | |
2340 | mathexit = 1; | |
2341 | ||
2342 | case Sopen: | |
2343 | if (!++depth) goto done; | |
2344 | break; | |
2345 | ||
2346 | case Sclose: | |
2347 | close1: | |
2348 | if (!--depth) goto done; | |
2349 | if (depth < min_depth) | |
7bf5e9e4 RS |
2350 | Fsignal (Qscan_error, |
2351 | Fcons (build_string ("Containing expression ends prematurely"), | |
2352 | Fcons (make_number (last_good), | |
2353 | Fcons (make_number (from), Qnil)))); | |
8489eb67 RS |
2354 | break; |
2355 | ||
2356 | case Sstring: | |
195d1361 | 2357 | case Sstring_fence: |
ef316cf0 | 2358 | temp_pos = dec_bytepos (from_byte); |
93da5fff | 2359 | stringterm = FETCH_CHAR (temp_pos); |
8489eb67 RS |
2360 | while (1) |
2361 | { | |
2362 | if (from >= stop) goto lose; | |
195d1361 | 2363 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
bd25db08 | 2364 | c = FETCH_CHAR (from_byte); |
42ebfa31 SM |
2365 | if (code == Sstring |
2366 | ? (c == stringterm | |
2367 | && SYNTAX_WITH_MULTIBYTE_CHECK (c) == Sstring) | |
bd25db08 | 2368 | : SYNTAX_WITH_MULTIBYTE_CHECK (c) == Sstring_fence) |
195d1361 | 2369 | break; |
7c7ca3d2 RS |
2370 | |
2371 | /* Some compilers can't handle this inside the switch. */ | |
bd25db08 | 2372 | temp = SYNTAX_WITH_MULTIBYTE_CHECK (c); |
7c7ca3d2 | 2373 | switch (temp) |
8489eb67 RS |
2374 | { |
2375 | case Scharquote: | |
2376 | case Sescape: | |
6a140a74 | 2377 | INC_BOTH (from, from_byte); |
8489eb67 | 2378 | } |
6a140a74 | 2379 | INC_BOTH (from, from_byte); |
8489eb67 | 2380 | } |
6a140a74 | 2381 | INC_BOTH (from, from_byte); |
8489eb67 RS |
2382 | if (!depth && sexpflag) goto done; |
2383 | break; | |
240c43e8 SM |
2384 | default: |
2385 | /* Ignore whitespace, punctuation, quote, endcomment. */ | |
2386 | break; | |
8489eb67 RS |
2387 | } |
2388 | } | |
2389 | ||
2390 | /* Reached end of buffer. Error if within object, return nil if between */ | |
2391 | if (depth) goto lose; | |
2392 | ||
2393 | immediate_quit = 0; | |
2394 | return Qnil; | |
2395 | ||
2396 | /* End of object reached */ | |
2397 | done: | |
2398 | count--; | |
2399 | } | |
2400 | ||
2401 | while (count < 0) | |
2402 | { | |
8489eb67 RS |
2403 | while (from > stop) |
2404 | { | |
6a140a74 | 2405 | DEC_BOTH (from, from_byte); |
195d1361 | 2406 | UPDATE_SYNTAX_TABLE_BACKWARD (from); |
6a140a74 | 2407 | c = FETCH_CHAR (from_byte); |
bd25db08 | 2408 | code = SYNTAX_WITH_MULTIBYTE_CHECK (c); |
7bf5e9e4 RS |
2409 | if (depth == min_depth) |
2410 | last_good = from; | |
7fc8191e | 2411 | comstyle = 0; |
95ff8dfc | 2412 | comnested = SYNTAX_COMMENT_NESTED (c); |
7fc8191e RS |
2413 | if (code == Sendcomment) |
2414 | comstyle = SYNTAX_COMMENT_STYLE (c); | |
8489eb67 | 2415 | if (from > stop && SYNTAX_COMEND_SECOND (c) |
1674d9a2 | 2416 | && prev_char_comend_first (from, from_byte) |
8489eb67 | 2417 | && parse_sexp_ignore_comments) |
e5d4f4dc | 2418 | { |
f902a008 | 2419 | /* We must record the comment style encountered so that |
e5d4f4dc | 2420 | later, we can match only the proper comment begin |
f902a008 | 2421 | sequence of the same style. */ |
6a140a74 | 2422 | DEC_BOTH (from, from_byte); |
f902a008 RS |
2423 | UPDATE_SYNTAX_TABLE_BACKWARD (from); |
2424 | code = Sendcomment; | |
95ff8dfc RS |
2425 | c1 = FETCH_CHAR (from_byte); |
2426 | comstyle = SYNTAX_COMMENT_STYLE (c1); | |
2427 | comnested = comnested || SYNTAX_COMMENT_NESTED (c1); | |
e5d4f4dc | 2428 | } |
7d0393cf | 2429 | |
9828a477 | 2430 | /* Quoting turns anything except a comment-ender |
e6365855 | 2431 | into a word character. Note that this cannot be true |
f902a008 | 2432 | if we decremented FROM in the if-statement above. */ |
9828a477 | 2433 | if (code != Sendcomment && char_quoted (from, from_byte)) |
240c43e8 SM |
2434 | { |
2435 | DEC_BOTH (from, from_byte); | |
2436 | code = Sword; | |
2437 | } | |
9828a477 | 2438 | else if (SYNTAX_PREFIX (c)) |
8489eb67 RS |
2439 | continue; |
2440 | ||
9828a477 | 2441 | switch (SWITCH_ENUM_CAST (code)) |
8489eb67 RS |
2442 | { |
2443 | case Sword: | |
2444 | case Ssymbol: | |
9828a477 KH |
2445 | case Sescape: |
2446 | case Scharquote: | |
8489eb67 | 2447 | if (depth || !sexpflag) break; |
195d1361 RS |
2448 | /* This word counts as a sexp; count object finished |
2449 | after passing it. */ | |
8489eb67 RS |
2450 | while (from > stop) |
2451 | { | |
6a140a74 | 2452 | temp_pos = from_byte; |
ef316cf0 RS |
2453 | if (! NILP (current_buffer->enable_multibyte_characters)) |
2454 | DEC_POS (temp_pos); | |
2455 | else | |
2456 | temp_pos--; | |
6a140a74 | 2457 | UPDATE_SYNTAX_TABLE_BACKWARD (from - 1); |
9828a477 | 2458 | c1 = FETCH_CHAR (temp_pos); |
bd25db08 | 2459 | temp_code = SYNTAX_WITH_MULTIBYTE_CHECK (c1); |
9828a477 KH |
2460 | /* Don't allow comment-end to be quoted. */ |
2461 | if (temp_code == Sendcomment) | |
2462 | goto done2; | |
6a140a74 | 2463 | quoted = char_quoted (from - 1, temp_pos); |
8489eb67 | 2464 | if (quoted) |
93da5fff | 2465 | { |
6a140a74 | 2466 | DEC_BOTH (from, from_byte); |
ef316cf0 | 2467 | temp_pos = dec_bytepos (temp_pos); |
6a140a74 | 2468 | UPDATE_SYNTAX_TABLE_BACKWARD (from - 1); |
93da5fff KH |
2469 | } |
2470 | c1 = FETCH_CHAR (temp_pos); | |
bd25db08 | 2471 | temp_code = SYNTAX_WITH_MULTIBYTE_CHECK (c1); |
93da5fff KH |
2472 | if (! (quoted || temp_code == Sword |
2473 | || temp_code == Ssymbol | |
2474 | || temp_code == Squote)) | |
8489eb67 | 2475 | goto done2; |
6a140a74 | 2476 | DEC_BOTH (from, from_byte); |
8489eb67 RS |
2477 | } |
2478 | goto done2; | |
2479 | ||
2480 | case Smath: | |
2481 | if (!sexpflag) | |
2482 | break; | |
ef316cf0 | 2483 | temp_pos = dec_bytepos (from_byte); |
6a140a74 | 2484 | UPDATE_SYNTAX_TABLE_BACKWARD (from - 1); |
93da5fff | 2485 | if (from != stop && c == FETCH_CHAR (temp_pos)) |
6a140a74 | 2486 | DEC_BOTH (from, from_byte); |
8489eb67 RS |
2487 | if (mathexit) |
2488 | { | |
2489 | mathexit = 0; | |
2490 | goto open2; | |
2491 | } | |
2492 | mathexit = 1; | |
2493 | ||
2494 | case Sclose: | |
2495 | if (!++depth) goto done2; | |
2496 | break; | |
2497 | ||
2498 | case Sopen: | |
2499 | open2: | |
2500 | if (!--depth) goto done2; | |
2501 | if (depth < min_depth) | |
7bf5e9e4 RS |
2502 | Fsignal (Qscan_error, |
2503 | Fcons (build_string ("Containing expression ends prematurely"), | |
2504 | Fcons (make_number (last_good), | |
2505 | Fcons (make_number (from), Qnil)))); | |
8489eb67 RS |
2506 | break; |
2507 | ||
2508 | case Sendcomment: | |
2509 | if (!parse_sexp_ignore_comments) | |
2510 | break; | |
95ff8dfc | 2511 | found = back_comment (from, from_byte, stop, comnested, comstyle, |
6a140a74 | 2512 | &out_charpos, &out_bytepos); |
1aa963c8 SM |
2513 | /* FIXME: if found == -1, then it really wasn't a comment-end. |
2514 | For single-char Sendcomment, we can't do much about it apart | |
2515 | from skipping the char. | |
2516 | For 2-char endcomments, we could try again, taking both | |
2517 | chars as separate entities, but it's a lot of trouble | |
2518 | for very little gain, so we don't bother either. -sm */ | |
6a140a74 RS |
2519 | if (found != -1) |
2520 | from = out_charpos, from_byte = out_bytepos; | |
8489eb67 RS |
2521 | break; |
2522 | ||
195d1361 RS |
2523 | case Scomment_fence: |
2524 | case Sstring_fence: | |
2525 | while (1) | |
2526 | { | |
195d1361 | 2527 | if (from == stop) goto lose; |
d0abdf7e | 2528 | DEC_BOTH (from, from_byte); |
195d1361 | 2529 | UPDATE_SYNTAX_TABLE_BACKWARD (from); |
7d0393cf | 2530 | if (!char_quoted (from, from_byte) |
bd25db08 KH |
2531 | && (c = FETCH_CHAR (from_byte), |
2532 | SYNTAX_WITH_MULTIBYTE_CHECK (c) == code)) | |
195d1361 RS |
2533 | break; |
2534 | } | |
2535 | if (code == Sstring_fence && !depth && sexpflag) goto done2; | |
2536 | break; | |
7d0393cf | 2537 | |
8489eb67 | 2538 | case Sstring: |
6a140a74 | 2539 | stringterm = FETCH_CHAR (from_byte); |
8489eb67 RS |
2540 | while (1) |
2541 | { | |
2542 | if (from == stop) goto lose; | |
d0abdf7e SM |
2543 | DEC_BOTH (from, from_byte); |
2544 | UPDATE_SYNTAX_TABLE_BACKWARD (from); | |
2545 | if (!char_quoted (from, from_byte) | |
2546 | && stringterm == (c = FETCH_CHAR (from_byte)) | |
42ebfa31 | 2547 | && SYNTAX_WITH_MULTIBYTE_CHECK (c) == Sstring) |
8489eb67 | 2548 | break; |
8489eb67 | 2549 | } |
8489eb67 RS |
2550 | if (!depth && sexpflag) goto done2; |
2551 | break; | |
240c43e8 SM |
2552 | default: |
2553 | /* Ignore whitespace, punctuation, quote, endcomment. */ | |
2554 | break; | |
8489eb67 RS |
2555 | } |
2556 | } | |
2557 | ||
2558 | /* Reached start of buffer. Error if within object, return nil if between */ | |
2559 | if (depth) goto lose; | |
2560 | ||
2561 | immediate_quit = 0; | |
2562 | return Qnil; | |
2563 | ||
2564 | done2: | |
2565 | count++; | |
2566 | } | |
2567 | ||
2568 | ||
2569 | immediate_quit = 0; | |
1e142fb7 | 2570 | XSETFASTINT (val, from); |
8489eb67 RS |
2571 | return val; |
2572 | ||
2573 | lose: | |
7bf5e9e4 RS |
2574 | Fsignal (Qscan_error, |
2575 | Fcons (build_string ("Unbalanced parentheses"), | |
2576 | Fcons (make_number (last_good), | |
2577 | Fcons (make_number (from), Qnil)))); | |
ab229fdd | 2578 | abort (); |
8489eb67 RS |
2579 | /* NOTREACHED */ |
2580 | } | |
2581 | ||
8489eb67 | 2582 | DEFUN ("scan-lists", Fscan_lists, Sscan_lists, 3, 3, 0, |
fdb82f93 PJ |
2583 | doc: /* Scan from character number FROM by COUNT lists. |
2584 | Returns the character number of the position thus found. | |
2585 | ||
2586 | If DEPTH is nonzero, paren depth begins counting from that value, | |
2587 | only places where the depth in parentheses becomes zero | |
2588 | are candidates for stopping; COUNT such places are counted. | |
2589 | Thus, a positive value for DEPTH means go out levels. | |
2590 | ||
2591 | Comments are ignored if `parse-sexp-ignore-comments' is non-nil. | |
2592 | ||
2593 | If the beginning or end of (the accessible part of) the buffer is reached | |
2594 | and the depth is wrong, an error is signaled. | |
2595 | If the depth is right but the count is not used up, nil is returned. */) | |
2596 | (from, count, depth) | |
8489eb67 RS |
2597 | Lisp_Object from, count, depth; |
2598 | { | |
b7826503 PJ |
2599 | CHECK_NUMBER (from); |
2600 | CHECK_NUMBER (count); | |
2601 | CHECK_NUMBER (depth); | |
8489eb67 RS |
2602 | |
2603 | return scan_lists (XINT (from), XINT (count), XINT (depth), 0); | |
2604 | } | |
2605 | ||
2606 | DEFUN ("scan-sexps", Fscan_sexps, Sscan_sexps, 2, 2, 0, | |
fdb82f93 PJ |
2607 | doc: /* Scan from character number FROM by COUNT balanced expressions. |
2608 | If COUNT is negative, scan backwards. | |
2609 | Returns the character number of the position thus found. | |
2610 | ||
2611 | Comments are ignored if `parse-sexp-ignore-comments' is non-nil. | |
2612 | ||
2613 | If the beginning or end of (the accessible part of) the buffer is reached | |
2614 | in the middle of a parenthetical grouping, an error is signaled. | |
2615 | If the beginning or end is reached between groupings | |
2616 | but before count is used up, nil is returned. */) | |
2617 | (from, count) | |
8489eb67 RS |
2618 | Lisp_Object from, count; |
2619 | { | |
b7826503 PJ |
2620 | CHECK_NUMBER (from); |
2621 | CHECK_NUMBER (count); | |
8489eb67 RS |
2622 | |
2623 | return scan_lists (XINT (from), XINT (count), 0, 1); | |
2624 | } | |
2625 | ||
2626 | DEFUN ("backward-prefix-chars", Fbackward_prefix_chars, Sbackward_prefix_chars, | |
fdb82f93 PJ |
2627 | 0, 0, 0, |
2628 | doc: /* Move point backward over any number of chars with prefix syntax. | |
2629 | This includes chars with "quote" or "prefix" syntax (' or p). */) | |
2630 | () | |
8489eb67 RS |
2631 | { |
2632 | int beg = BEGV; | |
6a140a74 RS |
2633 | int opoint = PT; |
2634 | int opoint_byte = PT_BYTE; | |
6ec8bbd2 | 2635 | int pos = PT; |
6a140a74 | 2636 | int pos_byte = PT_BYTE; |
93da5fff | 2637 | int c; |
93da5fff | 2638 | |
7d0393cf | 2639 | if (pos <= beg) |
195d1361 | 2640 | { |
f902a008 RS |
2641 | SET_PT_BOTH (opoint, opoint_byte); |
2642 | ||
2643 | return Qnil; | |
195d1361 | 2644 | } |
8489eb67 | 2645 | |
f902a008 RS |
2646 | SETUP_SYNTAX_TABLE (pos, -1); |
2647 | ||
6a140a74 RS |
2648 | DEC_BOTH (pos, pos_byte); |
2649 | ||
1fd3172d | 2650 | while (!char_quoted (pos, pos_byte) |
195d1361 | 2651 | /* Previous statement updates syntax table. */ |
6a140a74 | 2652 | && ((c = FETCH_CHAR (pos_byte), SYNTAX (c) == Squote) |
93da5fff KH |
2653 | || SYNTAX_PREFIX (c))) |
2654 | { | |
1fd3172d RS |
2655 | opoint = pos; |
2656 | opoint_byte = pos_byte; | |
2657 | ||
2658 | if (pos + 1 > beg) | |
2659 | DEC_BOTH (pos, pos_byte); | |
93da5fff | 2660 | } |
8489eb67 | 2661 | |
6a140a74 | 2662 | SET_PT_BOTH (opoint, opoint_byte); |
8489eb67 RS |
2663 | |
2664 | return Qnil; | |
2665 | } | |
2666 | \f | |
6a140a74 | 2667 | /* Parse forward from FROM / FROM_BYTE to END, |
e5d4f4dc RS |
2668 | assuming that FROM has state OLDSTATE (nil means FROM is start of function), |
2669 | and return a description of the state of the parse at END. | |
c81a3712 | 2670 | If STOPBEFORE is nonzero, stop at the start of an atom. |
644ea4df RS |
2671 | If COMMENTSTOP is 1, stop at the start of a comment. |
2672 | If COMMENTSTOP is -1, stop at the start or end of a comment, | |
2673 | after the beginning of a string, or after the end of a string. */ | |
8489eb67 | 2674 | |
340f92b5 | 2675 | static void |
6a140a74 | 2676 | scan_sexps_forward (stateptr, from, from_byte, end, targetdepth, |
c81a3712 | 2677 | stopbefore, oldstate, commentstop) |
e5d4f4dc | 2678 | struct lisp_parse_state *stateptr; |
8489eb67 | 2679 | register int from; |
ddc447fc | 2680 | int end, targetdepth, stopbefore, from_byte; |
8489eb67 | 2681 | Lisp_Object oldstate; |
c81a3712 | 2682 | int commentstop; |
8489eb67 RS |
2683 | { |
2684 | struct lisp_parse_state state; | |
2685 | ||
2686 | register enum syntaxcode code; | |
95ff8dfc RS |
2687 | int c1; |
2688 | int comnested; | |
8489eb67 RS |
2689 | struct level { int last, prev; }; |
2690 | struct level levelstart[100]; | |
2691 | register struct level *curlevel = levelstart; | |
2692 | struct level *endlevel = levelstart + 100; | |
8489eb67 RS |
2693 | register int depth; /* Paren depth of current scanning location. |
2694 | level - levelstart equals this except | |
2695 | when the depth becomes negative. */ | |
2696 | int mindepth; /* Lowest DEPTH value seen. */ | |
2697 | int start_quoted = 0; /* Nonzero means starting after a char quote */ | |
2698 | Lisp_Object tem; | |
93da5fff | 2699 | int prev_from; /* Keep one character before FROM. */ |
6a140a74 | 2700 | int prev_from_byte; |
1fd3172d | 2701 | int prev_from_syntax; |
195d1361 RS |
2702 | int boundary_stop = commentstop == -1; |
2703 | int nofence; | |
95ff8dfc RS |
2704 | int found; |
2705 | int out_bytepos, out_charpos; | |
7c7ca3d2 | 2706 | int temp; |
93da5fff KH |
2707 | |
2708 | prev_from = from; | |
6a140a74 RS |
2709 | prev_from_byte = from_byte; |
2710 | if (from != BEGV) | |
2711 | DEC_BOTH (prev_from, prev_from_byte); | |
93da5fff KH |
2712 | |
2713 | /* Use this macro instead of `from++'. */ | |
6a140a74 RS |
2714 | #define INC_FROM \ |
2715 | do { prev_from = from; \ | |
2716 | prev_from_byte = from_byte; \ | |
ab229fdd AS |
2717 | temp = FETCH_CHAR (prev_from_byte); \ |
2718 | prev_from_syntax = SYNTAX_WITH_FLAGS (temp); \ | |
ef316cf0 | 2719 | INC_BOTH (from, from_byte); \ |
3ceb4629 SM |
2720 | if (from < end) \ |
2721 | UPDATE_SYNTAX_TABLE_FORWARD (from); \ | |
6a140a74 | 2722 | } while (0) |
8489eb67 RS |
2723 | |
2724 | immediate_quit = 1; | |
2725 | QUIT; | |
2726 | ||
265a9e55 | 2727 | if (NILP (oldstate)) |
8489eb67 RS |
2728 | { |
2729 | depth = 0; | |
2730 | state.instring = -1; | |
2731 | state.incomment = 0; | |
195d1361 RS |
2732 | state.comstyle = 0; /* comment style a by default. */ |
2733 | state.comstr_start = -1; /* no comment/string seen. */ | |
8489eb67 RS |
2734 | } |
2735 | else | |
2736 | { | |
2737 | tem = Fcar (oldstate); | |
265a9e55 | 2738 | if (!NILP (tem)) |
8489eb67 RS |
2739 | depth = XINT (tem); |
2740 | else | |
2741 | depth = 0; | |
2742 | ||
2743 | oldstate = Fcdr (oldstate); | |
2744 | oldstate = Fcdr (oldstate); | |
2745 | oldstate = Fcdr (oldstate); | |
2746 | tem = Fcar (oldstate); | |
195d1361 | 2747 | /* Check whether we are inside string_fence-style string: */ |
7d0393cf JB |
2748 | state.instring = (!NILP (tem) |
2749 | ? (INTEGERP (tem) ? XINT (tem) : ST_STRING_STYLE) | |
e76f1c44 | 2750 | : -1); |
8489eb67 RS |
2751 | |
2752 | oldstate = Fcdr (oldstate); | |
2753 | tem = Fcar (oldstate); | |
e76f1c44 GM |
2754 | state.incomment = (!NILP (tem) |
2755 | ? (INTEGERP (tem) ? XINT (tem) : -1) | |
95ff8dfc | 2756 | : 0); |
8489eb67 RS |
2757 | |
2758 | oldstate = Fcdr (oldstate); | |
2759 | tem = Fcar (oldstate); | |
265a9e55 | 2760 | start_quoted = !NILP (tem); |
e5d4f4dc | 2761 | |
95ff8dfc | 2762 | /* if the eighth element of the list is nil, we are in comment |
195d1361 RS |
2763 | style a. If it is non-nil, we are in comment style b */ |
2764 | oldstate = Fcdr (oldstate); | |
e5d4f4dc | 2765 | oldstate = Fcdr (oldstate); |
195d1361 | 2766 | tem = Fcar (oldstate); |
7d0393cf | 2767 | state.comstyle = NILP (tem) ? 0 : (EQ (tem, Qsyntax_table) |
e76f1c44 | 2768 | ? ST_COMMENT_STYLE : 1); |
195d1361 | 2769 | |
e5d4f4dc | 2770 | oldstate = Fcdr (oldstate); |
e5d4f4dc | 2771 | tem = Fcar (oldstate); |
195d1361 | 2772 | state.comstr_start = NILP (tem) ? -1 : XINT (tem) ; |
1a102a58 RS |
2773 | oldstate = Fcdr (oldstate); |
2774 | tem = Fcar (oldstate); | |
2775 | while (!NILP (tem)) /* >= second enclosing sexps. */ | |
2776 | { | |
2777 | /* curlevel++->last ran into compiler bug on Apollo */ | |
2778 | curlevel->last = XINT (Fcar (tem)); | |
2779 | if (++curlevel == endlevel) | |
02010917 | 2780 | curlevel--; /* error ("Nesting too deep for parser"); */ |
1a102a58 RS |
2781 | curlevel->prev = -1; |
2782 | curlevel->last = -1; | |
2783 | tem = Fcdr (tem); | |
2784 | } | |
8489eb67 RS |
2785 | } |
2786 | state.quoted = 0; | |
2787 | mindepth = depth; | |
2788 | ||
2789 | curlevel->prev = -1; | |
2790 | curlevel->last = -1; | |
2791 | ||
326b283b | 2792 | SETUP_SYNTAX_TABLE (prev_from, 1); |
ab229fdd AS |
2793 | temp = FETCH_CHAR (prev_from_byte); |
2794 | prev_from_syntax = SYNTAX_WITH_FLAGS (temp); | |
3ceb4629 | 2795 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
326b283b | 2796 | |
195d1361 | 2797 | /* Enter the loop at a place appropriate for initial state. */ |
8489eb67 | 2798 | |
326b283b RS |
2799 | if (state.incomment) |
2800 | goto startincomment; | |
8489eb67 RS |
2801 | if (state.instring >= 0) |
2802 | { | |
195d1361 | 2803 | nofence = state.instring != ST_STRING_STYLE; |
326b283b RS |
2804 | if (start_quoted) |
2805 | goto startquotedinstring; | |
8489eb67 RS |
2806 | goto startinstring; |
2807 | } | |
326b283b RS |
2808 | else if (start_quoted) |
2809 | goto startquoted; | |
1fd3172d | 2810 | |
8489eb67 RS |
2811 | while (from < end) |
2812 | { | |
93da5fff | 2813 | INC_FROM; |
1fd3172d | 2814 | code = prev_from_syntax & 0xff; |
4c920633 | 2815 | |
c5d4b96f SM |
2816 | if (from < end |
2817 | && SYNTAX_FLAGS_COMSTART_FIRST (prev_from_syntax) | |
2818 | && (c1 = FETCH_CHAR (from_byte), | |
2819 | SYNTAX_COMSTART_SECOND (c1))) | |
2820 | /* Duplicate code to avoid a complex if-expression | |
2821 | which causes trouble for the SGI compiler. */ | |
95ff8dfc | 2822 | { |
c5d4b96f SM |
2823 | /* Record the comment style we have entered so that only |
2824 | the comment-end sequence of the same style actually | |
2825 | terminates the comment section. */ | |
2826 | state.comstyle = SYNTAX_COMMENT_STYLE (c1); | |
2827 | comnested = SYNTAX_FLAGS_COMMENT_NESTED (prev_from_syntax); | |
2828 | comnested = comnested || SYNTAX_COMMENT_NESTED (c1); | |
2829 | state.incomment = comnested ? 1 : -1; | |
95ff8dfc | 2830 | state.comstr_start = prev_from; |
c5d4b96f SM |
2831 | INC_FROM; |
2832 | code = Scomment; | |
95ff8dfc | 2833 | } |
4c920633 | 2834 | else if (code == Scomment_fence) |
e5d4f4dc RS |
2835 | { |
2836 | /* Record the comment style we have entered so that only | |
2837 | the comment-end sequence of the same style actually | |
2838 | terminates the comment section. */ | |
95ff8dfc RS |
2839 | state.comstyle = ST_COMMENT_STYLE; |
2840 | state.incomment = -1; | |
195d1361 | 2841 | state.comstr_start = prev_from; |
e5d4f4dc | 2842 | code = Scomment; |
e5d4f4dc | 2843 | } |
c5d4b96f SM |
2844 | else if (code == Scomment) |
2845 | { | |
2846 | state.comstyle = SYNTAX_FLAGS_COMMENT_STYLE (prev_from_syntax); | |
2847 | state.incomment = (SYNTAX_FLAGS_COMMENT_NESTED (prev_from_syntax) ? | |
2848 | 1 : -1); | |
2849 | state.comstr_start = prev_from; | |
2850 | } | |
e5d4f4dc | 2851 | |
1fd3172d | 2852 | if (SYNTAX_FLAGS_PREFIX (prev_from_syntax)) |
8489eb67 | 2853 | continue; |
0220c518 | 2854 | switch (SWITCH_ENUM_CAST (code)) |
8489eb67 RS |
2855 | { |
2856 | case Sescape: | |
2857 | case Scharquote: | |
2858 | if (stopbefore) goto stop; /* this arg means stop at sexp start */ | |
93da5fff | 2859 | curlevel->last = prev_from; |
8489eb67 RS |
2860 | startquoted: |
2861 | if (from == end) goto endquoted; | |
93da5fff | 2862 | INC_FROM; |
8489eb67 RS |
2863 | goto symstarted; |
2864 | /* treat following character as a word constituent */ | |
2865 | case Sword: | |
2866 | case Ssymbol: | |
2867 | if (stopbefore) goto stop; /* this arg means stop at sexp start */ | |
93da5fff | 2868 | curlevel->last = prev_from; |
8489eb67 RS |
2869 | symstarted: |
2870 | while (from < end) | |
2871 | { | |
7c7ca3d2 | 2872 | /* Some compilers can't handle this inside the switch. */ |
ab229fdd AS |
2873 | temp = FETCH_CHAR (from_byte); |
2874 | temp = SYNTAX (temp); | |
7c7ca3d2 | 2875 | switch (temp) |
8489eb67 RS |
2876 | { |
2877 | case Scharquote: | |
2878 | case Sescape: | |
93da5fff | 2879 | INC_FROM; |
8489eb67 RS |
2880 | if (from == end) goto endquoted; |
2881 | break; | |
2882 | case Sword: | |
2883 | case Ssymbol: | |
2884 | case Squote: | |
2885 | break; | |
2886 | default: | |
2887 | goto symdone; | |
2888 | } | |
93da5fff | 2889 | INC_FROM; |
8489eb67 RS |
2890 | } |
2891 | symdone: | |
2892 | curlevel->prev = curlevel->last; | |
2893 | break; | |
2894 | ||
240c43e8 | 2895 | case Scomment_fence: /* Can't happen because it's handled above. */ |
8489eb67 | 2896 | case Scomment: |
195d1361 | 2897 | if (commentstop || boundary_stop) goto done; |
d355bd8a SM |
2898 | startincomment: |
2899 | /* The (from == BEGV) test was to enter the loop in the middle so | |
95ff8dfc | 2900 | that we find a 2-char comment ender even if we start in the |
e6365855 | 2901 | middle of it. We don't want to do that if we're just at the |
d355bd8a | 2902 | beginning of the comment (think of (*) ... (*)). */ |
95ff8dfc RS |
2903 | found = forw_comment (from, from_byte, end, |
2904 | state.incomment, state.comstyle, | |
e6365855 SM |
2905 | (from == BEGV || from < state.comstr_start + 3) |
2906 | ? 0 : prev_from_syntax, | |
95ff8dfc RS |
2907 | &out_charpos, &out_bytepos, &state.incomment); |
2908 | from = out_charpos; from_byte = out_bytepos; | |
2909 | /* Beware! prev_from and friends are invalid now. | |
2910 | Luckily, the `done' doesn't use them and the INC_FROM | |
2911 | sets them to a sane value without looking at them. */ | |
2912 | if (!found) goto done; | |
d355bd8a | 2913 | INC_FROM; |
8489eb67 | 2914 | state.incomment = 0; |
e5d4f4dc | 2915 | state.comstyle = 0; /* reset the comment style */ |
195d1361 | 2916 | if (boundary_stop) goto done; |
8489eb67 RS |
2917 | break; |
2918 | ||
2919 | case Sopen: | |
2920 | if (stopbefore) goto stop; /* this arg means stop at sexp start */ | |
2921 | depth++; | |
2922 | /* curlevel++->last ran into compiler bug on Apollo */ | |
93da5fff | 2923 | curlevel->last = prev_from; |
8489eb67 | 2924 | if (++curlevel == endlevel) |
02010917 | 2925 | curlevel--; /* error ("Nesting too deep for parser"); */ |
8489eb67 RS |
2926 | curlevel->prev = -1; |
2927 | curlevel->last = -1; | |
30844415 | 2928 | if (targetdepth == depth) goto done; |
8489eb67 RS |
2929 | break; |
2930 | ||
2931 | case Sclose: | |
2932 | depth--; | |
2933 | if (depth < mindepth) | |
2934 | mindepth = depth; | |
2935 | if (curlevel != levelstart) | |
2936 | curlevel--; | |
2937 | curlevel->prev = curlevel->last; | |
30844415 | 2938 | if (targetdepth == depth) goto done; |
8489eb67 RS |
2939 | break; |
2940 | ||
2941 | case Sstring: | |
195d1361 RS |
2942 | case Sstring_fence: |
2943 | state.comstr_start = from - 1; | |
8489eb67 | 2944 | if (stopbefore) goto stop; /* this arg means stop at sexp start */ |
93da5fff | 2945 | curlevel->last = prev_from; |
7d0393cf | 2946 | state.instring = (code == Sstring |
6a140a74 | 2947 | ? (FETCH_CHAR (prev_from_byte)) |
195d1361 RS |
2948 | : ST_STRING_STYLE); |
2949 | if (boundary_stop) goto done; | |
8489eb67 | 2950 | startinstring: |
195d1361 | 2951 | { |
644ea4df | 2952 | nofence = state.instring != ST_STRING_STYLE; |
7d0393cf | 2953 | |
644ea4df RS |
2954 | while (1) |
2955 | { | |
2956 | int c; | |
195d1361 | 2957 | |
644ea4df | 2958 | if (from >= end) goto done; |
6a140a74 | 2959 | c = FETCH_CHAR (from_byte); |
7c7ca3d2 RS |
2960 | /* Some compilers can't handle this inside the switch. */ |
2961 | temp = SYNTAX (c); | |
ccf89641 KH |
2962 | |
2963 | /* Check TEMP here so that if the char has | |
2964 | a syntax-table property which says it is NOT | |
2965 | a string character, it does not end the string. */ | |
2966 | if (nofence && c == state.instring && temp == Sstring) | |
2967 | break; | |
2968 | ||
7c7ca3d2 | 2969 | switch (temp) |
644ea4df RS |
2970 | { |
2971 | case Sstring_fence: | |
2972 | if (!nofence) goto string_end; | |
2973 | break; | |
2974 | case Scharquote: | |
2975 | case Sescape: | |
2976 | INC_FROM; | |
2977 | startquotedinstring: | |
2978 | if (from >= end) goto endquoted; | |
195d1361 | 2979 | } |
644ea4df RS |
2980 | INC_FROM; |
2981 | } | |
195d1361 RS |
2982 | } |
2983 | string_end: | |
8489eb67 RS |
2984 | state.instring = -1; |
2985 | curlevel->prev = curlevel->last; | |
93da5fff | 2986 | INC_FROM; |
195d1361 | 2987 | if (boundary_stop) goto done; |
8489eb67 RS |
2988 | break; |
2989 | ||
2990 | case Smath: | |
240c43e8 SM |
2991 | /* FIXME: We should do something with it. */ |
2992 | break; | |
2993 | default: | |
2994 | /* Ignore whitespace, punctuation, quote, endcomment. */ | |
8489eb67 RS |
2995 | break; |
2996 | } | |
2997 | } | |
2998 | goto done; | |
2999 | ||
3000 | stop: /* Here if stopping before start of sexp. */ | |
93da5fff | 3001 | from = prev_from; /* We have just fetched the char that starts it; */ |
8489eb67 RS |
3002 | goto done; /* but return the position before it. */ |
3003 | ||
3004 | endquoted: | |
3005 | state.quoted = 1; | |
3006 | done: | |
3007 | state.depth = depth; | |
3008 | state.mindepth = mindepth; | |
3009 | state.thislevelstart = curlevel->prev; | |
3010 | state.prevlevelstart | |
3011 | = (curlevel == levelstart) ? -1 : (curlevel - 1)->last; | |
3012 | state.location = from; | |
1a102a58 RS |
3013 | state.levelstarts = Qnil; |
3014 | while (--curlevel >= levelstart) | |
3015 | state.levelstarts = Fcons (make_number (curlevel->last), | |
3016 | state.levelstarts); | |
8489eb67 RS |
3017 | immediate_quit = 0; |
3018 | ||
e5d4f4dc | 3019 | *stateptr = state; |
8489eb67 RS |
3020 | } |
3021 | ||
c81a3712 | 3022 | DEFUN ("parse-partial-sexp", Fparse_partial_sexp, Sparse_partial_sexp, 2, 6, 0, |
fdb82f93 PJ |
3023 | doc: /* Parse Lisp syntax starting at FROM until TO; return status of parse at TO. |
3024 | Parsing stops at TO or when certain criteria are met; | |
3025 | point is set to where parsing stops. | |
3026 | If fifth arg OLDSTATE is omitted or nil, | |
3027 | parsing assumes that FROM is the beginning of a function. | |
0e6228bc | 3028 | Value is a list of elements describing final state of parsing: |
fdb82f93 PJ |
3029 | 0. depth in parens. |
3030 | 1. character address of start of innermost containing list; nil if none. | |
3031 | 2. character address of start of last complete sexp terminated. | |
3032 | 3. non-nil if inside a string. | |
3033 | (it is the character that will terminate the string, | |
3034 | or t if the string should be terminated by a generic string delimiter.) | |
7d0393cf | 3035 | 4. nil if outside a comment, t if inside a non-nestable comment, |
fdb82f93 PJ |
3036 | else an integer (the current comment nesting). |
3037 | 5. t if following a quote character. | |
3038 | 6. the minimum paren-depth encountered during this scan. | |
3039 | 7. t if in a comment of style b; symbol `syntax-table' if the comment | |
3040 | should be terminated by a generic comment delimiter. | |
3041 | 8. character address of start of comment or string; nil if not in one. | |
3042 | 9. Intermediate data for continuation of parsing (subject to change). | |
3043 | If third arg TARGETDEPTH is non-nil, parsing stops if the depth | |
3044 | in parentheses becomes equal to TARGETDEPTH. | |
3045 | Fourth arg STOPBEFORE non-nil means stop when come to | |
3046 | any character that starts a sexp. | |
0e6228bc | 3047 | Fifth arg OLDSTATE is a list like what this function returns. |
fdb82f93 PJ |
3048 | It is used to initialize the state of the parse. Elements number 1, 2, 6 |
3049 | and 8 are ignored; you can leave off element 8 (the last) entirely. | |
3050 | Sixth arg COMMENTSTOP non-nil means stop at the start of a comment. | |
3051 | If it is symbol `syntax-table', stop after the start of a comment or a | |
3052 | string, or after end of a comment or a string. */) | |
3053 | (from, to, targetdepth, stopbefore, oldstate, commentstop) | |
c81a3712 | 3054 | Lisp_Object from, to, targetdepth, stopbefore, oldstate, commentstop; |
8489eb67 RS |
3055 | { |
3056 | struct lisp_parse_state state; | |
3057 | int target; | |
3058 | ||
265a9e55 | 3059 | if (!NILP (targetdepth)) |
8489eb67 | 3060 | { |
b7826503 | 3061 | CHECK_NUMBER (targetdepth); |
8489eb67 RS |
3062 | target = XINT (targetdepth); |
3063 | } | |
3064 | else | |
3065 | target = -100000; /* We won't reach this depth */ | |
3066 | ||
3067 | validate_region (&from, &to); | |
6a140a74 RS |
3068 | scan_sexps_forward (&state, XINT (from), CHAR_TO_BYTE (XINT (from)), |
3069 | XINT (to), | |
c81a3712 | 3070 | target, !NILP (stopbefore), oldstate, |
7d0393cf | 3071 | (NILP (commentstop) |
195d1361 | 3072 | ? 0 : (EQ (commentstop, Qsyntax_table) ? -1 : 1))); |
8489eb67 RS |
3073 | |
3074 | SET_PT (state.location); | |
7d0393cf | 3075 | |
8489eb67 RS |
3076 | return Fcons (make_number (state.depth), |
3077 | Fcons (state.prevlevelstart < 0 ? Qnil : make_number (state.prevlevelstart), | |
3078 | Fcons (state.thislevelstart < 0 ? Qnil : make_number (state.thislevelstart), | |
7d0393cf JB |
3079 | Fcons (state.instring >= 0 |
3080 | ? (state.instring == ST_STRING_STYLE | |
195d1361 | 3081 | ? Qt : make_number (state.instring)) : Qnil, |
95ff8dfc RS |
3082 | Fcons (state.incomment < 0 ? Qt : |
3083 | (state.incomment == 0 ? Qnil : | |
3084 | make_number (state.incomment)), | |
8489eb67 | 3085 | Fcons (state.quoted ? Qt : Qnil, |
bff37d2a | 3086 | Fcons (make_number (state.mindepth), |
7d0393cf | 3087 | Fcons ((state.comstyle |
bff37d2a RS |
3088 | ? (state.comstyle == ST_COMMENT_STYLE |
3089 | ? Qsyntax_table : Qt) : | |
3090 | Qnil), | |
0beaf54f DL |
3091 | Fcons (((state.incomment |
3092 | || (state.instring >= 0)) | |
bff37d2a RS |
3093 | ? make_number (state.comstr_start) |
3094 | : Qnil), | |
1a102a58 | 3095 | Fcons (state.levelstarts, Qnil)))))))))); |
8489eb67 RS |
3096 | } |
3097 | \f | |
dfcf069d | 3098 | void |
8489eb67 RS |
3099 | init_syntax_once () |
3100 | { | |
78f9a1f7 | 3101 | register int i, c; |
8ea151b2 | 3102 | Lisp_Object temp; |
8489eb67 | 3103 | |
5ebaddf5 RS |
3104 | /* This has to be done here, before we call Fmake_char_table. */ |
3105 | Qsyntax_table = intern ("syntax-table"); | |
3106 | staticpro (&Qsyntax_table); | |
3107 | ||
3108 | /* Intern this now in case it isn't already done. | |
3109 | Setting this variable twice is harmless. | |
3110 | But don't staticpro it here--that is done in alloc.c. */ | |
3111 | Qchar_table_extra_slots = intern ("char-table-extra-slots"); | |
3112 | ||
93da5fff | 3113 | /* Create objects which can be shared among syntax tables. */ |
42ebfa31 | 3114 | Vsyntax_code_object = Fmake_vector (make_number (Smax), Qnil); |
93da5fff KH |
3115 | for (i = 0; i < XVECTOR (Vsyntax_code_object)->size; i++) |
3116 | XVECTOR (Vsyntax_code_object)->contents[i] | |
3117 | = Fcons (make_number (i), Qnil); | |
3118 | ||
5ebaddf5 RS |
3119 | /* Now we are ready to set up this property, so we can |
3120 | create syntax tables. */ | |
3121 | Fput (Qsyntax_table, Qchar_table_extra_slots, make_number (0)); | |
3122 | ||
93da5fff | 3123 | temp = XVECTOR (Vsyntax_code_object)->contents[(int) Swhitespace]; |
8489eb67 | 3124 | |
5ebaddf5 | 3125 | Vstandard_syntax_table = Fmake_char_table (Qsyntax_table, temp); |
8489eb67 | 3126 | |
aa7b08b4 RS |
3127 | /* Control characters should not be whitespace. */ |
3128 | temp = XVECTOR (Vsyntax_code_object)->contents[(int) Spunct]; | |
3129 | for (i = 0; i <= ' ' - 1; i++) | |
3130 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, i, temp); | |
3131 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, 0177, temp); | |
3132 | ||
3133 | /* Except that a few really are whitespace. */ | |
3134 | temp = XVECTOR (Vsyntax_code_object)->contents[(int) Swhitespace]; | |
3135 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, ' ', temp); | |
3136 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '\t', temp); | |
3137 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '\n', temp); | |
3138 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, 015, temp); | |
3139 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, 014, temp); | |
3140 | ||
93da5fff | 3141 | temp = XVECTOR (Vsyntax_code_object)->contents[(int) Sword]; |
8489eb67 | 3142 | for (i = 'a'; i <= 'z'; i++) |
8ea151b2 | 3143 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, i, temp); |
8489eb67 | 3144 | for (i = 'A'; i <= 'Z'; i++) |
8ea151b2 | 3145 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, i, temp); |
8489eb67 | 3146 | for (i = '0'; i <= '9'; i++) |
8ea151b2 RS |
3147 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, i, temp); |
3148 | ||
3149 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '$', temp); | |
3150 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '%', temp); | |
3151 | ||
3152 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '(', | |
3153 | Fcons (make_number (Sopen), make_number (')'))); | |
3154 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, ')', | |
3155 | Fcons (make_number (Sclose), make_number ('('))); | |
3156 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '[', | |
3157 | Fcons (make_number (Sopen), make_number (']'))); | |
3158 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, ']', | |
3159 | Fcons (make_number (Sclose), make_number ('['))); | |
3160 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '{', | |
3161 | Fcons (make_number (Sopen), make_number ('}'))); | |
3162 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '}', | |
3163 | Fcons (make_number (Sclose), make_number ('{'))); | |
3164 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '"', | |
3165 | Fcons (make_number ((int) Sstring), Qnil)); | |
3166 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '\\', | |
3167 | Fcons (make_number ((int) Sescape), Qnil)); | |
3168 | ||
93da5fff | 3169 | temp = XVECTOR (Vsyntax_code_object)->contents[(int) Ssymbol]; |
8489eb67 | 3170 | for (i = 0; i < 10; i++) |
78f9a1f7 KH |
3171 | { |
3172 | c = "_-+*/&|<>="[i]; | |
3173 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, c, temp); | |
3174 | } | |
8489eb67 | 3175 | |
93da5fff | 3176 | temp = XVECTOR (Vsyntax_code_object)->contents[(int) Spunct]; |
8489eb67 | 3177 | for (i = 0; i < 12; i++) |
78f9a1f7 KH |
3178 | { |
3179 | c = ".,;:?!#@~^'`"[i]; | |
3180 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, c, temp); | |
3181 | } | |
bd25db08 KH |
3182 | |
3183 | /* All multibyte characters have syntax `word' by default. */ | |
3184 | temp = XVECTOR (Vsyntax_code_object)->contents[(int) Sword]; | |
3185 | for (i = CHAR_TABLE_SINGLE_BYTE_SLOTS; i < CHAR_TABLE_ORDINARY_SLOTS; i++) | |
3186 | XCHAR_TABLE (Vstandard_syntax_table)->contents[i] = temp; | |
8489eb67 RS |
3187 | } |
3188 | ||
dfcf069d | 3189 | void |
8489eb67 RS |
3190 | syms_of_syntax () |
3191 | { | |
3192 | Qsyntax_table_p = intern ("syntax-table-p"); | |
3193 | staticpro (&Qsyntax_table_p); | |
3194 | ||
93da5fff KH |
3195 | staticpro (&Vsyntax_code_object); |
3196 | ||
a2994c46 KS |
3197 | staticpro (&gl_state.object); |
3198 | staticpro (&gl_state.global_code); | |
3199 | staticpro (&gl_state.current_syntax_table); | |
3200 | staticpro (&gl_state.old_prop); | |
3201 | ||
3202 | /* Defined in regex.c */ | |
3203 | staticpro (&re_match_object); | |
3204 | ||
7bf5e9e4 RS |
3205 | Qscan_error = intern ("scan-error"); |
3206 | staticpro (&Qscan_error); | |
3207 | Fput (Qscan_error, Qerror_conditions, | |
f3be100f | 3208 | Fcons (Qscan_error, Fcons (Qerror, Qnil))); |
7bf5e9e4 RS |
3209 | Fput (Qscan_error, Qerror_message, |
3210 | build_string ("Scan error")); | |
3211 | ||
8489eb67 | 3212 | DEFVAR_BOOL ("parse-sexp-ignore-comments", &parse_sexp_ignore_comments, |
fdb82f93 | 3213 | doc: /* Non-nil means `forward-sexp', etc., should treat comments as whitespace. */); |
8489eb67 | 3214 | |
195d1361 | 3215 | DEFVAR_BOOL ("parse-sexp-lookup-properties", &parse_sexp_lookup_properties, |
fdb82f93 PJ |
3216 | doc: /* Non-nil means `forward-sexp', etc., obey `syntax-table' property. |
3217 | Otherwise, that text property is simply ignored. | |
3218 | See the info node `(elisp)Syntax Properties' for a description of the | |
3219 | `syntax-table' property. */); | |
195d1361 | 3220 | |
8489eb67 RS |
3221 | words_include_escapes = 0; |
3222 | DEFVAR_BOOL ("words-include-escapes", &words_include_escapes, | |
fdb82f93 | 3223 | doc: /* Non-nil means `forward-word', etc., should treat escape chars part of words. */); |
8489eb67 | 3224 | |
bd25db08 | 3225 | DEFVAR_BOOL ("multibyte-syntax-as-symbol", &multibyte_syntax_as_symbol, |
fdb82f93 | 3226 | doc: /* Non-nil means `scan-sexps' treats all multibyte characters as symbol. */); |
bd25db08 KH |
3227 | multibyte_syntax_as_symbol = 0; |
3228 | ||
f4ed767f GM |
3229 | DEFVAR_BOOL ("open-paren-in-column-0-is-defun-start", |
3230 | &open_paren_in_column_0_is_defun_start, | |
b222e415 | 3231 | doc: /* *Non-nil means an open paren in column 0 denotes the start of a defun. */); |
f4ed767f GM |
3232 | open_paren_in_column_0_is_defun_start = 1; |
3233 | ||
8489eb67 RS |
3234 | defsubr (&Ssyntax_table_p); |
3235 | defsubr (&Ssyntax_table); | |
3236 | defsubr (&Sstandard_syntax_table); | |
3237 | defsubr (&Scopy_syntax_table); | |
3238 | defsubr (&Sset_syntax_table); | |
3239 | defsubr (&Schar_syntax); | |
beefa22e | 3240 | defsubr (&Smatching_paren); |
c65adb44 | 3241 | defsubr (&Sstring_to_syntax); |
8489eb67 | 3242 | defsubr (&Smodify_syntax_entry); |
62abe9cb | 3243 | defsubr (&Sinternal_describe_syntax_value); |
8489eb67 RS |
3244 | |
3245 | defsubr (&Sforward_word); | |
3246 | ||
195d1361 RS |
3247 | defsubr (&Sskip_chars_forward); |
3248 | defsubr (&Sskip_chars_backward); | |
3249 | defsubr (&Sskip_syntax_forward); | |
3250 | defsubr (&Sskip_syntax_backward); | |
3251 | ||
b3cfe0c8 | 3252 | defsubr (&Sforward_comment); |
8489eb67 RS |
3253 | defsubr (&Sscan_lists); |
3254 | defsubr (&Sscan_sexps); | |
3255 | defsubr (&Sbackward_prefix_chars); | |
3256 | defsubr (&Sparse_partial_sexp); | |
3257 | } | |
ab5796a9 MB |
3258 | |
3259 | /* arch-tag: 3e297b9f-088e-4b64-8f4c-fb0b3443e412 | |
3260 | (do not change this comment) */ |