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8489eb67 | 1 | /* GNU Emacs routines to deal with syntax tables; also word and list parsing. |
3a22ee35 | 2 | Copyright (C) 1985, 1987, 1993, 1994 Free Software Foundation, Inc. |
8489eb67 RS |
3 | |
4 | This file is part of GNU Emacs. | |
5 | ||
6 | GNU Emacs is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
a4275ad1 | 8 | the Free Software Foundation; either version 2, or (at your option) |
8489eb67 RS |
9 | any later version. |
10 | ||
11 | GNU Emacs is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU Emacs; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | ||
18160b98 | 21 | #include <config.h> |
8489eb67 RS |
22 | #include <ctype.h> |
23 | #include "lisp.h" | |
24 | #include "commands.h" | |
25 | #include "buffer.h" | |
26 | #include "syntax.h" | |
27 | ||
28 | Lisp_Object Qsyntax_table_p; | |
29 | ||
340f92b5 RS |
30 | static void scan_sexps_forward (); |
31 | static int char_quoted (); | |
32 | ||
8489eb67 RS |
33 | int words_include_escapes; |
34 | ||
e5d4f4dc RS |
35 | /* This is the internal form of the parse state used in parse-partial-sexp. */ |
36 | ||
37 | struct lisp_parse_state | |
38 | { | |
39 | int depth; /* Depth at end of parsing */ | |
40 | int instring; /* -1 if not within string, else desired terminator. */ | |
41 | int incomment; /* Nonzero if within a comment at end of parsing */ | |
42 | int comstyle; /* comment style a=0, or b=1 */ | |
43 | int quoted; /* Nonzero if just after an escape char at end of parsing */ | |
44 | int thislevelstart; /* Char number of most recent start-of-expression at current level */ | |
45 | int prevlevelstart; /* Char number of start of containing expression */ | |
46 | int location; /* Char number at which parsing stopped. */ | |
47 | int mindepth; /* Minimum depth seen while scanning. */ | |
48 | int comstart; /* Position just after last comment starter. */ | |
49 | }; | |
50 | \f | |
37bef230 RS |
51 | /* These variables are a cache for finding the start of a defun. |
52 | find_start_pos is the place for which the defun start was found. | |
53 | find_start_value is the defun start position found for it. | |
54 | find_start_buffer is the buffer it was found in. | |
55 | find_start_begv is the BEGV value when it was found. | |
56 | find_start_modiff is the value of MODIFF when it was found. */ | |
57 | ||
58 | static int find_start_pos; | |
59 | static int find_start_value; | |
60 | static struct buffer *find_start_buffer; | |
61 | static int find_start_begv; | |
62 | static int find_start_modiff; | |
63 | ||
64 | /* Find a defun-start that is the last one before POS (or nearly the last). | |
65 | We record what we find, so that another call in the same area | |
66 | can return the same value right away. */ | |
67 | ||
68 | static int | |
69 | find_defun_start (pos) | |
70 | int pos; | |
71 | { | |
72 | int tem; | |
73 | int shortage; | |
74 | ||
75 | /* Use previous finding, if it's valid and applies to this inquiry. */ | |
76 | if (current_buffer == find_start_buffer | |
77 | /* Reuse the defun-start even if POS is a little farther on. | |
78 | POS might be in the next defun, but that's ok. | |
79 | Our value may not be the best possible, but will still be usable. */ | |
80 | && pos <= find_start_pos + 1000 | |
81 | && pos >= find_start_value | |
82 | && BEGV == find_start_begv | |
83 | && MODIFF == find_start_modiff) | |
84 | return find_start_value; | |
85 | ||
86 | /* Back up to start of line. */ | |
be5357e2 | 87 | tem = scan_buffer ('\n', pos, BEGV, -1, &shortage, 1); |
37bef230 RS |
88 | |
89 | while (tem > BEGV) | |
90 | { | |
91 | /* Open-paren at start of line means we found our defun-start. */ | |
92 | if (SYNTAX (FETCH_CHAR (tem)) == Sopen) | |
93 | break; | |
94 | /* Move to beg of previous line. */ | |
be5357e2 | 95 | tem = scan_buffer ('\n', tem, BEGV, -2, &shortage, 1); |
37bef230 RS |
96 | } |
97 | ||
98 | /* Record what we found, for the next try. */ | |
99 | find_start_value = tem; | |
100 | find_start_buffer = current_buffer; | |
101 | find_start_modiff = MODIFF; | |
102 | find_start_begv = BEGV; | |
103 | find_start_pos = pos; | |
104 | ||
105 | return find_start_value; | |
106 | } | |
107 | \f | |
8489eb67 RS |
108 | DEFUN ("syntax-table-p", Fsyntax_table_p, Ssyntax_table_p, 1, 1, 0, |
109 | "Return t if ARG is a syntax table.\n\ | |
110 | Any vector of 256 elements will do.") | |
111 | (obj) | |
112 | Lisp_Object obj; | |
113 | { | |
330cf232 | 114 | if (VECTORP (obj) && XVECTOR (obj)->size == 0400) |
8489eb67 RS |
115 | return Qt; |
116 | return Qnil; | |
117 | } | |
118 | ||
119 | Lisp_Object | |
120 | check_syntax_table (obj) | |
121 | Lisp_Object obj; | |
122 | { | |
123 | register Lisp_Object tem; | |
124 | while (tem = Fsyntax_table_p (obj), | |
265a9e55 | 125 | NILP (tem)) |
b3cfe0c8 | 126 | obj = wrong_type_argument (Qsyntax_table_p, obj); |
8489eb67 RS |
127 | return obj; |
128 | } | |
129 | ||
130 | ||
131 | DEFUN ("syntax-table", Fsyntax_table, Ssyntax_table, 0, 0, 0, | |
132 | "Return the current syntax table.\n\ | |
133 | This is the one specified by the current buffer.") | |
134 | () | |
135 | { | |
136 | return current_buffer->syntax_table; | |
137 | } | |
138 | ||
139 | DEFUN ("standard-syntax-table", Fstandard_syntax_table, | |
140 | Sstandard_syntax_table, 0, 0, 0, | |
141 | "Return the standard syntax table.\n\ | |
142 | This is the one used for new buffers.") | |
143 | () | |
144 | { | |
145 | return Vstandard_syntax_table; | |
146 | } | |
147 | ||
148 | DEFUN ("copy-syntax-table", Fcopy_syntax_table, Scopy_syntax_table, 0, 1, 0, | |
149 | "Construct a new syntax table and return it.\n\ | |
150 | It is a copy of the TABLE, which defaults to the standard syntax table.") | |
151 | (table) | |
152 | Lisp_Object table; | |
153 | { | |
154 | Lisp_Object size, val; | |
1e142fb7 KH |
155 | XSETFASTINT (size, 0400); |
156 | XSETFASTINT (val, 0); | |
8489eb67 | 157 | val = Fmake_vector (size, val); |
265a9e55 | 158 | if (!NILP (table)) |
8489eb67 | 159 | table = check_syntax_table (table); |
265a9e55 | 160 | else if (NILP (Vstandard_syntax_table)) |
8489eb67 RS |
161 | /* Can only be null during initialization */ |
162 | return val; | |
163 | else table = Vstandard_syntax_table; | |
164 | ||
165 | bcopy (XVECTOR (table)->contents, | |
166 | XVECTOR (val)->contents, 0400 * sizeof (Lisp_Object)); | |
167 | return val; | |
168 | } | |
169 | ||
170 | DEFUN ("set-syntax-table", Fset_syntax_table, Sset_syntax_table, 1, 1, 0, | |
171 | "Select a new syntax table for the current buffer.\n\ | |
172 | One argument, a syntax table.") | |
173 | (table) | |
174 | Lisp_Object table; | |
175 | { | |
176 | table = check_syntax_table (table); | |
177 | current_buffer->syntax_table = table; | |
178 | /* Indicate that this buffer now has a specified syntax table. */ | |
f110a664 RS |
179 | current_buffer->local_var_flags |
180 | |= XFASTINT (buffer_local_flags.syntax_table); | |
8489eb67 RS |
181 | return table; |
182 | } | |
183 | \f | |
184 | /* Convert a letter which signifies a syntax code | |
185 | into the code it signifies. | |
186 | This is used by modify-syntax-entry, and other things. */ | |
187 | ||
188 | unsigned char syntax_spec_code[0400] = | |
189 | { 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
190 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
191 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
192 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
193 | (char) Swhitespace, 0377, (char) Sstring, 0377, | |
194 | (char) Smath, 0377, 0377, (char) Squote, | |
195 | (char) Sopen, (char) Sclose, 0377, 0377, | |
196 | 0377, (char) Swhitespace, (char) Spunct, (char) Scharquote, | |
197 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
198 | 0377, 0377, 0377, 0377, | |
199 | (char) Scomment, 0377, (char) Sendcomment, 0377, | |
6cb71bf6 | 200 | (char) Sinherit, 0377, 0377, 0377, 0377, 0377, 0377, 0377, /* @, A ... */ |
8489eb67 RS |
201 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, |
202 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, (char) Sword, | |
203 | 0377, 0377, 0377, 0377, (char) Sescape, 0377, 0377, (char) Ssymbol, | |
204 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, /* `, a, ... */ | |
205 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
206 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, (char) Sword, | |
207 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377 | |
208 | }; | |
209 | ||
210 | /* Indexed by syntax code, give the letter that describes it. */ | |
211 | ||
6cb71bf6 | 212 | char syntax_code_spec[14] = |
8489eb67 | 213 | { |
6cb71bf6 | 214 | ' ', '.', 'w', '_', '(', ')', '\'', '\"', '$', '\\', '/', '<', '>', '@' |
8489eb67 RS |
215 | }; |
216 | \f | |
217 | DEFUN ("char-syntax", Fchar_syntax, Schar_syntax, 1, 1, 0, | |
218 | "Return the syntax code of CHAR, described by a character.\n\ | |
219 | For example, if CHAR is a word constituent, the character `?w' is returned.\n\ | |
220 | The characters that correspond to various syntax codes\n\ | |
221 | are listed in the documentation of `modify-syntax-entry'.") | |
222 | (ch) | |
223 | Lisp_Object ch; | |
224 | { | |
225 | CHECK_NUMBER (ch, 0); | |
beefa22e RS |
226 | return make_number (syntax_code_spec[(int) SYNTAX (XINT (ch))]); |
227 | } | |
228 | ||
229 | DEFUN ("matching-paren", Fmatching_paren, Smatching_paren, 1, 1, 0, | |
230 | "Return the matching parenthesis of CHAR, or nil if none.") | |
231 | (ch) | |
232 | Lisp_Object ch; | |
233 | { | |
234 | int code; | |
235 | CHECK_NUMBER (ch, 0); | |
236 | code = SYNTAX (XINT (ch)); | |
a8bd7cd8 | 237 | if (code == Sopen || code == Sclose) |
beefa22e RS |
238 | return make_number (SYNTAX_MATCH (XINT (ch))); |
239 | return Qnil; | |
8489eb67 RS |
240 | } |
241 | ||
242 | /* This comment supplies the doc string for modify-syntax-entry, | |
243 | for make-docfile to see. We cannot put this in the real DEFUN | |
244 | due to limits in the Unix cpp. | |
245 | ||
2fcea188 | 246 | DEFUN ("modify-syntax-entry", foo, bar, 2, 3, 0, |
8489eb67 RS |
247 | "Set syntax for character CHAR according to string S.\n\ |
248 | The syntax is changed only for table TABLE, which defaults to\n\ | |
249 | the current buffer's syntax table.\n\ | |
250 | The first character of S should be one of the following:\n\ | |
32676c08 JB |
251 | Space or - whitespace syntax. w word constituent.\n\ |
252 | _ symbol constituent. . punctuation.\n\ | |
253 | ( open-parenthesis. ) close-parenthesis.\n\ | |
254 | \" string quote. \\ escape.\n\ | |
255 | $ paired delimiter. ' expression quote or prefix operator.\n\ | |
abae13bd | 256 | < comment starter. > comment ender.\n\ |
6cb71bf6 | 257 | / character-quote. @ inherit from `standard-syntax-table'.\n\ |
abae13bd | 258 | \n\ |
8489eb67 RS |
259 | Only single-character comment start and end sequences are represented thus.\n\ |
260 | Two-character sequences are represented as described below.\n\ | |
261 | The second character of S is the matching parenthesis,\n\ | |
262 | used only if the first character is `(' or `)'.\n\ | |
263 | Any additional characters are flags.\n\ | |
e5d4f4dc | 264 | Defined flags are the characters 1, 2, 3, 4, b, and p.\n\ |
8489eb67 RS |
265 | 1 means C is the start of a two-char comment start sequence.\n\ |
266 | 2 means C is the second character of such a sequence.\n\ | |
267 | 3 means C is the start of a two-char comment end sequence.\n\ | |
268 | 4 means C is the second character of such a sequence.\n\ | |
e5d4f4dc RS |
269 | \n\ |
270 | There can be up to two orthogonal comment sequences. This is to support\n\ | |
271 | language modes such as C++. By default, all comment sequences are of style\n\ | |
abae13bd RS |
272 | a, but you can set the comment sequence style to b (on the second character\n\ |
273 | of a comment-start, or the first character of a comment-end sequence) using\n\ | |
e5d4f4dc RS |
274 | this flag:\n\ |
275 | b means C is part of comment sequence b.\n\ | |
276 | \n\ | |
277 | p means C is a prefix character for `backward-prefix-chars';\n\ | |
278 | such characters are treated as whitespace when they occur\n\ | |
8489eb67 | 279 | between expressions.") |
2fcea188 | 280 | (char, s, table) |
8489eb67 RS |
281 | */ |
282 | ||
283 | DEFUN ("modify-syntax-entry", Fmodify_syntax_entry, Smodify_syntax_entry, 2, 3, | |
284 | /* I really don't know why this is interactive | |
285 | help-form should at least be made useful whilst reading the second arg | |
286 | */ | |
287 | "cSet syntax for character: \nsSet syntax for %s to: ", | |
288 | 0 /* See immediately above */) | |
289 | (c, newentry, syntax_table) | |
290 | Lisp_Object c, newentry, syntax_table; | |
291 | { | |
292 | register unsigned char *p, match; | |
293 | register enum syntaxcode code; | |
247e20a8 | 294 | int val; |
8489eb67 RS |
295 | |
296 | CHECK_NUMBER (c, 0); | |
297 | CHECK_STRING (newentry, 1); | |
265a9e55 | 298 | if (NILP (syntax_table)) |
8489eb67 RS |
299 | syntax_table = current_buffer->syntax_table; |
300 | else | |
301 | syntax_table = check_syntax_table (syntax_table); | |
302 | ||
303 | p = XSTRING (newentry)->data; | |
304 | code = (enum syntaxcode) syntax_spec_code[*p++]; | |
305 | if (((int) code & 0377) == 0377) | |
306 | error ("invalid syntax description letter: %c", c); | |
307 | ||
308 | match = *p; | |
309 | if (match) p++; | |
310 | if (match == ' ') match = 0; | |
311 | ||
247e20a8 | 312 | val = (match << 8) + (int) code; |
8489eb67 RS |
313 | while (*p) |
314 | switch (*p++) | |
315 | { | |
316 | case '1': | |
247e20a8 | 317 | val |= 1 << 16; |
8489eb67 RS |
318 | break; |
319 | ||
320 | case '2': | |
247e20a8 | 321 | val |= 1 << 17; |
8489eb67 RS |
322 | break; |
323 | ||
324 | case '3': | |
247e20a8 | 325 | val |= 1 << 18; |
8489eb67 RS |
326 | break; |
327 | ||
328 | case '4': | |
247e20a8 | 329 | val |= 1 << 19; |
8489eb67 RS |
330 | break; |
331 | ||
332 | case 'p': | |
247e20a8 | 333 | val |= 1 << 20; |
8489eb67 | 334 | break; |
e5d4f4dc RS |
335 | |
336 | case 'b': | |
247e20a8 | 337 | val |= 1 << 21; |
e5d4f4dc | 338 | break; |
8489eb67 RS |
339 | } |
340 | ||
247e20a8 | 341 | XSETFASTINT (XVECTOR (syntax_table)->contents[0xFF & XINT (c)], val); |
8489eb67 RS |
342 | |
343 | return Qnil; | |
344 | } | |
345 | \f | |
346 | /* Dump syntax table to buffer in human-readable format */ | |
347 | ||
340f92b5 | 348 | static void |
8489eb67 RS |
349 | describe_syntax (value) |
350 | Lisp_Object value; | |
351 | { | |
352 | register enum syntaxcode code; | |
e5d4f4dc | 353 | char desc, match, start1, start2, end1, end2, prefix, comstyle; |
8489eb67 RS |
354 | char str[2]; |
355 | ||
356 | Findent_to (make_number (16), make_number (1)); | |
357 | ||
330cf232 | 358 | if (!INTEGERP (value)) |
8489eb67 RS |
359 | { |
360 | insert_string ("invalid"); | |
361 | return; | |
362 | } | |
363 | ||
364 | code = (enum syntaxcode) (XINT (value) & 0377); | |
365 | match = (XINT (value) >> 8) & 0377; | |
366 | start1 = (XINT (value) >> 16) & 1; | |
367 | start2 = (XINT (value) >> 17) & 1; | |
368 | end1 = (XINT (value) >> 18) & 1; | |
369 | end2 = (XINT (value) >> 19) & 1; | |
370 | prefix = (XINT (value) >> 20) & 1; | |
e5d4f4dc | 371 | comstyle = (XINT (value) >> 21) & 1; |
8489eb67 RS |
372 | |
373 | if ((int) code < 0 || (int) code >= (int) Smax) | |
374 | { | |
375 | insert_string ("invalid"); | |
376 | return; | |
377 | } | |
378 | desc = syntax_code_spec[(int) code]; | |
379 | ||
380 | str[0] = desc, str[1] = 0; | |
381 | insert (str, 1); | |
382 | ||
383 | str[0] = match ? match : ' '; | |
384 | insert (str, 1); | |
385 | ||
386 | ||
387 | if (start1) | |
388 | insert ("1", 1); | |
389 | if (start2) | |
390 | insert ("2", 1); | |
391 | ||
392 | if (end1) | |
393 | insert ("3", 1); | |
394 | if (end2) | |
395 | insert ("4", 1); | |
396 | ||
397 | if (prefix) | |
398 | insert ("p", 1); | |
e5d4f4dc RS |
399 | if (comstyle) |
400 | insert ("b", 1); | |
8489eb67 RS |
401 | |
402 | insert_string ("\twhich means: "); | |
403 | ||
404 | #ifdef SWITCH_ENUM_BUG | |
405 | switch ((int) code) | |
406 | #else | |
407 | switch (code) | |
408 | #endif | |
409 | { | |
410 | case Swhitespace: | |
411 | insert_string ("whitespace"); break; | |
412 | case Spunct: | |
413 | insert_string ("punctuation"); break; | |
414 | case Sword: | |
415 | insert_string ("word"); break; | |
416 | case Ssymbol: | |
417 | insert_string ("symbol"); break; | |
418 | case Sopen: | |
419 | insert_string ("open"); break; | |
420 | case Sclose: | |
421 | insert_string ("close"); break; | |
422 | case Squote: | |
423 | insert_string ("quote"); break; | |
424 | case Sstring: | |
425 | insert_string ("string"); break; | |
426 | case Smath: | |
427 | insert_string ("math"); break; | |
428 | case Sescape: | |
429 | insert_string ("escape"); break; | |
430 | case Scharquote: | |
431 | insert_string ("charquote"); break; | |
432 | case Scomment: | |
433 | insert_string ("comment"); break; | |
434 | case Sendcomment: | |
435 | insert_string ("endcomment"); break; | |
6cb71bf6 RS |
436 | case Sinherit: |
437 | insert_string ("inherit"); break; | |
8489eb67 RS |
438 | default: |
439 | insert_string ("invalid"); | |
440 | return; | |
441 | } | |
442 | ||
443 | if (match) | |
444 | { | |
445 | insert_string (", matches "); | |
410e16ff | 446 | insert_char (match); |
8489eb67 RS |
447 | } |
448 | ||
449 | if (start1) | |
450 | insert_string (",\n\t is the first character of a comment-start sequence"); | |
451 | if (start2) | |
452 | insert_string (",\n\t is the second character of a comment-start sequence"); | |
453 | ||
454 | if (end1) | |
455 | insert_string (",\n\t is the first character of a comment-end sequence"); | |
456 | if (end2) | |
457 | insert_string (",\n\t is the second character of a comment-end sequence"); | |
e5d4f4dc RS |
458 | if (comstyle) |
459 | insert_string (" (comment style b)"); | |
460 | ||
8489eb67 RS |
461 | if (prefix) |
462 | insert_string (",\n\t is a prefix character for `backward-prefix-chars'"); | |
463 | ||
464 | insert_string ("\n"); | |
465 | } | |
466 | ||
340f92b5 | 467 | static Lisp_Object |
8489eb67 RS |
468 | describe_syntax_1 (vector) |
469 | Lisp_Object vector; | |
470 | { | |
471 | struct buffer *old = current_buffer; | |
472 | set_buffer_internal (XBUFFER (Vstandard_output)); | |
b3cfe0c8 | 473 | describe_vector (vector, Qnil, describe_syntax, 0, Qnil); |
36cd82fe | 474 | call0 (intern ("help-mode")); |
8489eb67 RS |
475 | set_buffer_internal (old); |
476 | return Qnil; | |
477 | } | |
478 | ||
479 | DEFUN ("describe-syntax", Fdescribe_syntax, Sdescribe_syntax, 0, 0, "", | |
480 | "Describe the syntax specifications in the syntax table.\n\ | |
481 | The descriptions are inserted in a buffer, which is then displayed.") | |
482 | () | |
483 | { | |
484 | internal_with_output_to_temp_buffer | |
485 | ("*Help*", describe_syntax_1, current_buffer->syntax_table); | |
486 | ||
487 | return Qnil; | |
488 | } | |
489 | \f | |
490 | /* Return the position across COUNT words from FROM. | |
491 | If that many words cannot be found before the end of the buffer, return 0. | |
492 | COUNT negative means scan backward and stop at word beginning. */ | |
493 | ||
494 | scan_words (from, count) | |
495 | register int from, count; | |
496 | { | |
497 | register int beg = BEGV; | |
498 | register int end = ZV; | |
499 | register int code; | |
500 | ||
501 | immediate_quit = 1; | |
502 | QUIT; | |
503 | ||
504 | while (count > 0) | |
505 | { | |
506 | while (1) | |
507 | { | |
508 | if (from == end) | |
509 | { | |
510 | immediate_quit = 0; | |
511 | return 0; | |
512 | } | |
513 | code = SYNTAX (FETCH_CHAR (from)); | |
514 | if (words_include_escapes | |
515 | && (code == Sescape || code == Scharquote)) | |
516 | break; | |
517 | if (code == Sword) | |
518 | break; | |
519 | from++; | |
520 | } | |
521 | while (1) | |
522 | { | |
523 | if (from == end) break; | |
524 | code = SYNTAX (FETCH_CHAR (from)); | |
525 | if (!(words_include_escapes | |
526 | && (code == Sescape || code == Scharquote))) | |
527 | if (code != Sword) | |
528 | break; | |
529 | from++; | |
530 | } | |
531 | count--; | |
532 | } | |
533 | while (count < 0) | |
534 | { | |
535 | while (1) | |
536 | { | |
537 | if (from == beg) | |
538 | { | |
539 | immediate_quit = 0; | |
540 | return 0; | |
541 | } | |
542 | code = SYNTAX (FETCH_CHAR (from - 1)); | |
543 | if (words_include_escapes | |
544 | && (code == Sescape || code == Scharquote)) | |
545 | break; | |
546 | if (code == Sword) | |
547 | break; | |
548 | from--; | |
549 | } | |
550 | while (1) | |
551 | { | |
552 | if (from == beg) break; | |
553 | code = SYNTAX (FETCH_CHAR (from - 1)); | |
554 | if (!(words_include_escapes | |
555 | && (code == Sescape || code == Scharquote))) | |
556 | if (code != Sword) | |
557 | break; | |
558 | from--; | |
559 | } | |
560 | count++; | |
561 | } | |
562 | ||
563 | immediate_quit = 0; | |
564 | ||
565 | return from; | |
566 | } | |
567 | ||
568 | DEFUN ("forward-word", Fforward_word, Sforward_word, 1, 1, "p", | |
569 | "Move point forward ARG words (backward if ARG is negative).\n\ | |
570 | Normally returns t.\n\ | |
571 | If an edge of the buffer is reached, point is left there\n\ | |
572 | and nil is returned.") | |
573 | (count) | |
574 | Lisp_Object count; | |
575 | { | |
576 | int val; | |
577 | CHECK_NUMBER (count, 0); | |
578 | ||
579 | if (!(val = scan_words (point, XINT (count)))) | |
580 | { | |
581 | SET_PT (XINT (count) > 0 ? ZV : BEGV); | |
582 | return Qnil; | |
583 | } | |
584 | SET_PT (val); | |
585 | return Qt; | |
586 | } | |
587 | \f | |
b3cfe0c8 RS |
588 | DEFUN ("forward-comment", Fforward_comment, Sforward_comment, 1, 1, 0, |
589 | "Move forward across up to N comments. If N is negative, move backward.\n\ | |
b3cfe0c8 | 590 | Stop scanning if we find something other than a comment or whitespace.\n\ |
c81a3712 | 591 | Set point to where scanning stops.\n\ |
b3cfe0c8 RS |
592 | If N comments are found as expected, with nothing except whitespace\n\ |
593 | between them, return t; otherwise return nil.") | |
594 | (count) | |
840f481c | 595 | Lisp_Object count; |
b3cfe0c8 RS |
596 | { |
597 | register int from; | |
598 | register int stop; | |
599 | register int c; | |
600 | register enum syntaxcode code; | |
601 | int comstyle = 0; /* style of comment encountered */ | |
be720845 | 602 | int found; |
840f481c RS |
603 | int count1; |
604 | ||
605 | CHECK_NUMBER (count, 0); | |
606 | count1 = XINT (count); | |
b3cfe0c8 RS |
607 | |
608 | immediate_quit = 1; | |
609 | QUIT; | |
610 | ||
611 | from = PT; | |
612 | ||
840f481c | 613 | while (count1 > 0) |
b3cfe0c8 RS |
614 | { |
615 | stop = ZV; | |
04882296 | 616 | do |
b3cfe0c8 | 617 | { |
04882296 KH |
618 | if (from == stop) |
619 | { | |
620 | SET_PT (from); | |
621 | return Qnil; | |
622 | } | |
b3cfe0c8 RS |
623 | c = FETCH_CHAR (from); |
624 | code = SYNTAX (c); | |
625 | from++; | |
626 | comstyle = 0; | |
627 | if (from < stop && SYNTAX_COMSTART_FIRST (c) | |
628 | && SYNTAX_COMSTART_SECOND (FETCH_CHAR (from))) | |
629 | { | |
7fc8191e RS |
630 | /* We have encountered a comment start sequence and we |
631 | are ignoring all text inside comments. We must record | |
b3cfe0c8 RS |
632 | the comment style this sequence begins so that later, |
633 | only a comment end of the same style actually ends | |
7fc8191e | 634 | the comment section. */ |
b3cfe0c8 RS |
635 | code = Scomment; |
636 | comstyle = SYNTAX_COMMENT_STYLE (FETCH_CHAR (from)); | |
637 | from++; | |
638 | } | |
04882296 KH |
639 | } |
640 | while (code == Swhitespace || code == Sendcomment); | |
641 | if (code != Scomment) | |
642 | { | |
643 | immediate_quit = 0; | |
644 | SET_PT (from - 1); | |
645 | return Qnil; | |
646 | } | |
647 | /* We're at the start of a comment. */ | |
648 | while (1) | |
649 | { | |
650 | if (from == stop) | |
b3cfe0c8 RS |
651 | { |
652 | immediate_quit = 0; | |
04882296 | 653 | SET_PT (from); |
b3cfe0c8 RS |
654 | return Qnil; |
655 | } | |
04882296 | 656 | c = FETCH_CHAR (from); |
2eb1d6a2 | 657 | from++; |
04882296 KH |
658 | if (SYNTAX (c) == Sendcomment |
659 | && SYNTAX_COMMENT_STYLE (c) == comstyle) | |
660 | /* we have encountered a comment end of the same style | |
661 | as the comment sequence which began this comment | |
662 | section */ | |
663 | break; | |
04882296 KH |
664 | if (from < stop && SYNTAX_COMEND_FIRST (c) |
665 | && SYNTAX_COMEND_SECOND (FETCH_CHAR (from)) | |
666 | && SYNTAX_COMMENT_STYLE (c) == comstyle) | |
667 | /* we have encountered a comment end of the same style | |
668 | as the comment sequence which began this comment | |
669 | section */ | |
670 | { from++; break; } | |
b3cfe0c8 | 671 | } |
04882296 | 672 | /* We have skipped one comment. */ |
840f481c | 673 | count1--; |
b3cfe0c8 RS |
674 | } |
675 | ||
840f481c | 676 | while (count1 < 0) |
b3cfe0c8 RS |
677 | { |
678 | stop = BEGV; | |
679 | while (from > stop) | |
680 | { | |
681 | int quoted; | |
682 | ||
683 | from--; | |
684 | quoted = char_quoted (from); | |
685 | if (quoted) | |
686 | from--; | |
687 | c = FETCH_CHAR (from); | |
688 | code = SYNTAX (c); | |
689 | comstyle = 0; | |
7fc8191e RS |
690 | if (code == Sendcomment) |
691 | comstyle = SYNTAX_COMMENT_STYLE (c); | |
b3cfe0c8 RS |
692 | if (from > stop && SYNTAX_COMEND_SECOND (c) |
693 | && SYNTAX_COMEND_FIRST (FETCH_CHAR (from - 1)) | |
694 | && !char_quoted (from - 1)) | |
695 | { | |
7fc8191e | 696 | /* We must record the comment style encountered so that |
b3cfe0c8 | 697 | later, we can match only the proper comment begin |
7fc8191e | 698 | sequence of the same style. */ |
b3cfe0c8 RS |
699 | code = Sendcomment; |
700 | comstyle = SYNTAX_COMMENT_STYLE (FETCH_CHAR (from - 1)); | |
701 | from--; | |
702 | } | |
703 | ||
704 | if (code == Sendcomment && !quoted) | |
705 | { | |
8f9dc2ed | 706 | #if 0 |
b3cfe0c8 RS |
707 | if (code != SYNTAX (c)) |
708 | /* For a two-char comment ender, we can assume | |
709 | it does end a comment. So scan back in a simple way. */ | |
710 | { | |
711 | if (from != stop) from--; | |
712 | while (1) | |
713 | { | |
714 | if (SYNTAX (c = FETCH_CHAR (from)) == Scomment | |
715 | && SYNTAX_COMMENT_STYLE (c) == comstyle) | |
716 | break; | |
717 | if (from == stop) | |
718 | { | |
719 | immediate_quit = 0; | |
c81a3712 | 720 | SET_PT (from); |
b3cfe0c8 RS |
721 | return Qnil; |
722 | } | |
723 | from--; | |
724 | if (SYNTAX_COMSTART_SECOND (c) | |
725 | && SYNTAX_COMSTART_FIRST (FETCH_CHAR (from)) | |
726 | && SYNTAX_COMMENT_STYLE (c) == comstyle | |
727 | && !char_quoted (from)) | |
728 | break; | |
729 | } | |
730 | break; | |
731 | } | |
8f9dc2ed | 732 | #endif /* 0 */ |
b3cfe0c8 RS |
733 | |
734 | /* Look back, counting the parity of string-quotes, | |
735 | and recording the comment-starters seen. | |
736 | When we reach a safe place, assume that's not in a string; | |
737 | then step the main scan to the earliest comment-starter seen | |
738 | an even number of string quotes away from the safe place. | |
739 | ||
740 | OFROM[I] is position of the earliest comment-starter seen | |
741 | which is I+2X quotes from the comment-end. | |
742 | PARITY is current parity of quotes from the comment end. */ | |
743 | { | |
744 | int parity = 0; | |
745 | char my_stringend = 0; | |
746 | int string_lossage = 0; | |
747 | int comment_end = from; | |
748 | int comstart_pos = 0; | |
749 | int comstart_parity = 0; | |
4841063f | 750 | int scanstart = from - 1; |
b3cfe0c8 RS |
751 | |
752 | /* At beginning of range to scan, we're outside of strings; | |
753 | that determines quote parity to the comment-end. */ | |
754 | while (from != stop) | |
755 | { | |
756 | /* Move back and examine a character. */ | |
757 | from--; | |
758 | ||
759 | c = FETCH_CHAR (from); | |
760 | code = SYNTAX (c); | |
761 | ||
762 | /* If this char is the second of a 2-char comment sequence, | |
763 | back up and give the pair the appropriate syntax. */ | |
764 | if (from > stop && SYNTAX_COMEND_SECOND (c) | |
765 | && SYNTAX_COMEND_FIRST (FETCH_CHAR (from - 1))) | |
766 | { | |
767 | code = Sendcomment; | |
768 | from--; | |
4841063f | 769 | c = FETCH_CHAR (from); |
b3cfe0c8 RS |
770 | } |
771 | ||
4841063f RS |
772 | /* If this char starts a 2-char comment start sequence, |
773 | treat it like a 1-char comment starter. */ | |
774 | if (from < scanstart && SYNTAX_COMSTART_FIRST (c) | |
775 | && SYNTAX_COMSTART_SECOND (FETCH_CHAR (from + 1)) | |
776 | && comstyle == SYNTAX_COMMENT_STYLE (FETCH_CHAR (from + 1))) | |
777 | code = Scomment; | |
b3cfe0c8 RS |
778 | |
779 | /* Ignore escaped characters. */ | |
780 | if (char_quoted (from)) | |
781 | continue; | |
782 | ||
783 | /* Track parity of quotes. */ | |
784 | if (code == Sstring) | |
785 | { | |
786 | parity ^= 1; | |
787 | if (my_stringend == 0) | |
788 | my_stringend = c; | |
789 | /* If we have two kinds of string delimiters. | |
790 | There's no way to grok this scanning backwards. */ | |
791 | else if (my_stringend != c) | |
792 | string_lossage = 1; | |
793 | } | |
794 | ||
795 | /* Record comment-starters according to that | |
796 | quote-parity to the comment-end. */ | |
797 | if (code == Scomment) | |
798 | { | |
799 | comstart_parity = parity; | |
800 | comstart_pos = from; | |
801 | } | |
802 | ||
803 | /* If we find another earlier comment-ender, | |
eb8c3be9 | 804 | any comment-starts earlier than that don't count |
b3cfe0c8 RS |
805 | (because they go with the earlier comment-ender). */ |
806 | if (code == Sendcomment | |
807 | && SYNTAX_COMMENT_STYLE (FETCH_CHAR (from)) == comstyle) | |
808 | break; | |
809 | ||
810 | /* Assume a defun-start point is outside of strings. */ | |
811 | if (code == Sopen | |
812 | && (from == stop || FETCH_CHAR (from - 1) == '\n')) | |
813 | break; | |
814 | } | |
815 | ||
816 | if (comstart_pos == 0) | |
817 | from = comment_end; | |
818 | /* If the earliest comment starter | |
819 | is followed by uniform paired string quotes or none, | |
820 | we know it can't be inside a string | |
821 | since if it were then the comment ender would be inside one. | |
822 | So it does start a comment. Skip back to it. */ | |
823 | else if (comstart_parity == 0 && !string_lossage) | |
824 | from = comstart_pos; | |
825 | else | |
826 | { | |
827 | /* We had two kinds of string delimiters mixed up | |
828 | together. Decode this going forwards. | |
829 | Scan fwd from the previous comment ender | |
830 | to the one in question; this records where we | |
831 | last passed a comment starter. */ | |
832 | struct lisp_parse_state state; | |
833 | scan_sexps_forward (&state, find_defun_start (comment_end), | |
340f92b5 | 834 | comment_end - 1, -10000, 0, Qnil, 0); |
b3cfe0c8 RS |
835 | if (state.incomment) |
836 | from = state.comstart; | |
837 | else | |
838 | /* We can't grok this as a comment; scan it normally. */ | |
839 | from = comment_end; | |
840 | } | |
841 | } | |
7fc8191e RS |
842 | /* We have skipped one comment. */ |
843 | break; | |
b3cfe0c8 | 844 | } |
c81a3712 | 845 | else if ((code != Swhitespace && code != Scomment) || quoted) |
b3cfe0c8 RS |
846 | { |
847 | immediate_quit = 0; | |
c81a3712 | 848 | SET_PT (from + 1); |
b3cfe0c8 RS |
849 | return Qnil; |
850 | } | |
851 | } | |
852 | ||
840f481c | 853 | count1++; |
b3cfe0c8 RS |
854 | } |
855 | ||
856 | SET_PT (from); | |
857 | immediate_quit = 0; | |
858 | return Qt; | |
859 | } | |
860 | \f | |
8489eb67 RS |
861 | int parse_sexp_ignore_comments; |
862 | ||
863 | Lisp_Object | |
864 | scan_lists (from, count, depth, sexpflag) | |
865 | register int from; | |
866 | int count, depth, sexpflag; | |
867 | { | |
868 | Lisp_Object val; | |
869 | register int stop; | |
870 | register int c; | |
871 | char stringterm; | |
872 | int quoted; | |
873 | int mathexit = 0; | |
874 | register enum syntaxcode code; | |
875 | int min_depth = depth; /* Err out if depth gets less than this. */ | |
e5d4f4dc | 876 | int comstyle = 0; /* style of comment encountered */ |
8489eb67 RS |
877 | |
878 | if (depth > 0) min_depth = 0; | |
879 | ||
880 | immediate_quit = 1; | |
881 | QUIT; | |
882 | ||
883 | while (count > 0) | |
884 | { | |
885 | stop = ZV; | |
886 | while (from < stop) | |
887 | { | |
888 | c = FETCH_CHAR (from); | |
e5d4f4dc | 889 | code = SYNTAX (c); |
8489eb67 RS |
890 | from++; |
891 | if (from < stop && SYNTAX_COMSTART_FIRST (c) | |
892 | && SYNTAX_COMSTART_SECOND (FETCH_CHAR (from)) | |
893 | && parse_sexp_ignore_comments) | |
e5d4f4dc RS |
894 | { |
895 | /* we have encountered a comment start sequence and we | |
896 | are ignoring all text inside comments. we must record | |
897 | the comment style this sequence begins so that later, | |
898 | only a comment end of the same style actually ends | |
899 | the comment section */ | |
900 | code = Scomment; | |
901 | comstyle = SYNTAX_COMMENT_STYLE (FETCH_CHAR (from)); | |
902 | from++; | |
903 | } | |
904 | ||
8489eb67 RS |
905 | if (SYNTAX_PREFIX (c)) |
906 | continue; | |
907 | ||
908 | #ifdef SWITCH_ENUM_BUG | |
909 | switch ((int) code) | |
910 | #else | |
911 | switch (code) | |
912 | #endif | |
913 | { | |
914 | case Sescape: | |
915 | case Scharquote: | |
916 | if (from == stop) goto lose; | |
917 | from++; | |
918 | /* treat following character as a word constituent */ | |
919 | case Sword: | |
920 | case Ssymbol: | |
921 | if (depth || !sexpflag) break; | |
922 | /* This word counts as a sexp; return at end of it. */ | |
923 | while (from < stop) | |
924 | { | |
925 | #ifdef SWITCH_ENUM_BUG | |
e5d4f4dc | 926 | switch ((int) SYNTAX (FETCH_CHAR (from))) |
8489eb67 | 927 | #else |
e5d4f4dc | 928 | switch (SYNTAX (FETCH_CHAR (from))) |
8489eb67 RS |
929 | #endif |
930 | { | |
931 | case Scharquote: | |
932 | case Sescape: | |
933 | from++; | |
934 | if (from == stop) goto lose; | |
935 | break; | |
936 | case Sword: | |
937 | case Ssymbol: | |
938 | case Squote: | |
939 | break; | |
940 | default: | |
941 | goto done; | |
942 | } | |
943 | from++; | |
944 | } | |
945 | goto done; | |
946 | ||
947 | case Scomment: | |
948 | if (!parse_sexp_ignore_comments) break; | |
949 | while (1) | |
950 | { | |
c01f7ec0 RS |
951 | if (from == stop) |
952 | { | |
953 | if (depth == 0) | |
954 | goto done; | |
955 | goto lose; | |
956 | } | |
e5d4f4dc RS |
957 | c = FETCH_CHAR (from); |
958 | if (SYNTAX (c) == Sendcomment | |
959 | && SYNTAX_COMMENT_STYLE (c) == comstyle) | |
960 | /* we have encountered a comment end of the same style | |
961 | as the comment sequence which began this comment | |
962 | section */ | |
8489eb67 RS |
963 | break; |
964 | from++; | |
965 | if (from < stop && SYNTAX_COMEND_FIRST (c) | |
e5d4f4dc RS |
966 | && SYNTAX_COMEND_SECOND (FETCH_CHAR (from)) |
967 | && SYNTAX_COMMENT_STYLE (c) == comstyle) | |
968 | /* we have encountered a comment end of the same style | |
969 | as the comment sequence which began this comment | |
970 | section */ | |
8489eb67 RS |
971 | { from++; break; } |
972 | } | |
973 | break; | |
974 | ||
975 | case Smath: | |
976 | if (!sexpflag) | |
977 | break; | |
978 | if (from != stop && c == FETCH_CHAR (from)) | |
979 | from++; | |
980 | if (mathexit) | |
981 | { | |
982 | mathexit = 0; | |
983 | goto close1; | |
984 | } | |
985 | mathexit = 1; | |
986 | ||
987 | case Sopen: | |
988 | if (!++depth) goto done; | |
989 | break; | |
990 | ||
991 | case Sclose: | |
992 | close1: | |
993 | if (!--depth) goto done; | |
994 | if (depth < min_depth) | |
995 | error ("Containing expression ends prematurely"); | |
996 | break; | |
997 | ||
998 | case Sstring: | |
999 | stringterm = FETCH_CHAR (from - 1); | |
1000 | while (1) | |
1001 | { | |
1002 | if (from >= stop) goto lose; | |
1003 | if (FETCH_CHAR (from) == stringterm) break; | |
1004 | #ifdef SWITCH_ENUM_BUG | |
e5d4f4dc | 1005 | switch ((int) SYNTAX (FETCH_CHAR (from))) |
8489eb67 | 1006 | #else |
e5d4f4dc | 1007 | switch (SYNTAX (FETCH_CHAR (from))) |
8489eb67 RS |
1008 | #endif |
1009 | { | |
1010 | case Scharquote: | |
1011 | case Sescape: | |
1012 | from++; | |
1013 | } | |
1014 | from++; | |
1015 | } | |
1016 | from++; | |
1017 | if (!depth && sexpflag) goto done; | |
1018 | break; | |
1019 | } | |
1020 | } | |
1021 | ||
1022 | /* Reached end of buffer. Error if within object, return nil if between */ | |
1023 | if (depth) goto lose; | |
1024 | ||
1025 | immediate_quit = 0; | |
1026 | return Qnil; | |
1027 | ||
1028 | /* End of object reached */ | |
1029 | done: | |
1030 | count--; | |
1031 | } | |
1032 | ||
1033 | while (count < 0) | |
1034 | { | |
1035 | stop = BEGV; | |
1036 | while (from > stop) | |
1037 | { | |
1038 | from--; | |
1039 | if (quoted = char_quoted (from)) | |
1040 | from--; | |
1041 | c = FETCH_CHAR (from); | |
1042 | code = SYNTAX (c); | |
7fc8191e RS |
1043 | comstyle = 0; |
1044 | if (code == Sendcomment) | |
1045 | comstyle = SYNTAX_COMMENT_STYLE (c); | |
8489eb67 RS |
1046 | if (from > stop && SYNTAX_COMEND_SECOND (c) |
1047 | && SYNTAX_COMEND_FIRST (FETCH_CHAR (from - 1)) | |
1048 | && !char_quoted (from - 1) | |
1049 | && parse_sexp_ignore_comments) | |
e5d4f4dc RS |
1050 | { |
1051 | /* we must record the comment style encountered so that | |
1052 | later, we can match only the proper comment begin | |
1053 | sequence of the same style */ | |
1054 | code = Sendcomment; | |
1055 | comstyle = SYNTAX_COMMENT_STYLE (FETCH_CHAR (from - 1)); | |
1056 | from--; | |
1057 | } | |
1058 | ||
8489eb67 RS |
1059 | if (SYNTAX_PREFIX (c)) |
1060 | continue; | |
1061 | ||
1062 | #ifdef SWITCH_ENUM_BUG | |
1063 | switch ((int) (quoted ? Sword : code)) | |
1064 | #else | |
1065 | switch (quoted ? Sword : code) | |
1066 | #endif | |
1067 | { | |
1068 | case Sword: | |
1069 | case Ssymbol: | |
1070 | if (depth || !sexpflag) break; | |
1071 | /* This word counts as a sexp; count object finished after passing it. */ | |
1072 | while (from > stop) | |
1073 | { | |
1074 | quoted = char_quoted (from - 1); | |
1075 | if (quoted) | |
1076 | from--; | |
e5d4f4dc RS |
1077 | if (! (quoted || SYNTAX (FETCH_CHAR (from - 1)) == Sword |
1078 | || SYNTAX (FETCH_CHAR (from - 1)) == Ssymbol | |
1079 | || SYNTAX (FETCH_CHAR (from - 1)) == Squote)) | |
8489eb67 RS |
1080 | goto done2; |
1081 | from--; | |
1082 | } | |
1083 | goto done2; | |
1084 | ||
1085 | case Smath: | |
1086 | if (!sexpflag) | |
1087 | break; | |
1088 | if (from != stop && c == FETCH_CHAR (from - 1)) | |
1089 | from--; | |
1090 | if (mathexit) | |
1091 | { | |
1092 | mathexit = 0; | |
1093 | goto open2; | |
1094 | } | |
1095 | mathexit = 1; | |
1096 | ||
1097 | case Sclose: | |
1098 | if (!++depth) goto done2; | |
1099 | break; | |
1100 | ||
1101 | case Sopen: | |
1102 | open2: | |
1103 | if (!--depth) goto done2; | |
1104 | if (depth < min_depth) | |
1105 | error ("Containing expression ends prematurely"); | |
1106 | break; | |
1107 | ||
1108 | case Sendcomment: | |
1109 | if (!parse_sexp_ignore_comments) | |
1110 | break; | |
8f9dc2ed | 1111 | #if 0 |
37bef230 RS |
1112 | if (code != SYNTAX (c)) |
1113 | /* For a two-char comment ender, we can assume | |
1114 | it does end a comment. So scan back in a simple way. */ | |
1115 | { | |
1116 | if (from != stop) from--; | |
1117 | while (1) | |
1118 | { | |
1119 | if (SYNTAX (c = FETCH_CHAR (from)) == Scomment | |
1120 | && SYNTAX_COMMENT_STYLE (c) == comstyle) | |
1121 | break; | |
c01f7ec0 RS |
1122 | if (from == stop) |
1123 | { | |
1124 | if (depth == 0) | |
1125 | goto done2; | |
1126 | goto lose; | |
1127 | } | |
37bef230 RS |
1128 | from--; |
1129 | if (SYNTAX_COMSTART_SECOND (c) | |
1130 | && SYNTAX_COMSTART_FIRST (FETCH_CHAR (from)) | |
1131 | && SYNTAX_COMMENT_STYLE (c) == comstyle | |
1132 | && !char_quoted (from)) | |
1133 | break; | |
1134 | } | |
1135 | break; | |
1136 | } | |
8f9dc2ed | 1137 | #endif /* 0 */ |
37bef230 | 1138 | |
8489eb67 RS |
1139 | /* Look back, counting the parity of string-quotes, |
1140 | and recording the comment-starters seen. | |
1141 | When we reach a safe place, assume that's not in a string; | |
1142 | then step the main scan to the earliest comment-starter seen | |
1143 | an even number of string quotes away from the safe place. | |
1144 | ||
1145 | OFROM[I] is position of the earliest comment-starter seen | |
1146 | which is I+2X quotes from the comment-end. | |
1147 | PARITY is current parity of quotes from the comment end. */ | |
1148 | { | |
8489eb67 | 1149 | int parity = 0; |
e5d4f4dc RS |
1150 | char my_stringend = 0; |
1151 | int string_lossage = 0; | |
1152 | int comment_end = from; | |
37bef230 RS |
1153 | int comstart_pos = 0; |
1154 | int comstart_parity = 0; | |
4841063f | 1155 | int scanstart = from - 1; |
8489eb67 RS |
1156 | |
1157 | /* At beginning of range to scan, we're outside of strings; | |
1158 | that determines quote parity to the comment-end. */ | |
1159 | while (from != stop) | |
1160 | { | |
1161 | /* Move back and examine a character. */ | |
1162 | from--; | |
1163 | ||
1164 | c = FETCH_CHAR (from); | |
1165 | code = SYNTAX (c); | |
1166 | ||
1167 | /* If this char is the second of a 2-char comment sequence, | |
1168 | back up and give the pair the appropriate syntax. */ | |
1169 | if (from > stop && SYNTAX_COMEND_SECOND (c) | |
1170 | && SYNTAX_COMEND_FIRST (FETCH_CHAR (from - 1))) | |
e5d4f4dc RS |
1171 | { |
1172 | code = Sendcomment; | |
1173 | from--; | |
4841063f | 1174 | c = FETCH_CHAR (from); |
e5d4f4dc RS |
1175 | } |
1176 | ||
4841063f RS |
1177 | /* If this char starts a 2-char comment start sequence, |
1178 | treat it like a 1-char comment starter. */ | |
1179 | if (from < scanstart && SYNTAX_COMSTART_FIRST (c) | |
1180 | && SYNTAX_COMSTART_SECOND (FETCH_CHAR (from + 1)) | |
1181 | && comstyle == SYNTAX_COMMENT_STYLE (FETCH_CHAR (from + 1))) | |
1182 | code = Scomment; | |
8489eb67 RS |
1183 | |
1184 | /* Ignore escaped characters. */ | |
1185 | if (char_quoted (from)) | |
1186 | continue; | |
1187 | ||
37bef230 | 1188 | /* Track parity of quotes. */ |
8489eb67 | 1189 | if (code == Sstring) |
e5d4f4dc RS |
1190 | { |
1191 | parity ^= 1; | |
1192 | if (my_stringend == 0) | |
1193 | my_stringend = c; | |
37bef230 | 1194 | /* If we have two kinds of string delimiters. |
e5d4f4dc RS |
1195 | There's no way to grok this scanning backwards. */ |
1196 | else if (my_stringend != c) | |
1197 | string_lossage = 1; | |
1198 | } | |
8489eb67 RS |
1199 | |
1200 | /* Record comment-starters according to that | |
1201 | quote-parity to the comment-end. */ | |
1202 | if (code == Scomment) | |
37bef230 RS |
1203 | { |
1204 | comstart_parity = parity; | |
1205 | comstart_pos = from; | |
1206 | } | |
8489eb67 | 1207 | |
37bef230 | 1208 | /* If we find another earlier comment-ender, |
eb8c3be9 | 1209 | any comment-starts earlier than that don't count |
37bef230 | 1210 | (because they go with the earlier comment-ender). */ |
e5d4f4dc RS |
1211 | if (code == Sendcomment |
1212 | && SYNTAX_COMMENT_STYLE (FETCH_CHAR (from)) == comstyle) | |
8489eb67 | 1213 | break; |
37bef230 RS |
1214 | |
1215 | /* Assume a defun-start point is outside of strings. */ | |
1216 | if (code == Sopen | |
1217 | && (from == stop || FETCH_CHAR (from - 1) == '\n')) | |
1218 | break; | |
8489eb67 | 1219 | } |
37bef230 RS |
1220 | |
1221 | if (comstart_pos == 0) | |
1222 | from = comment_end; | |
1223 | /* If the earliest comment starter | |
1224 | is followed by uniform paired string quotes or none, | |
1225 | we know it can't be inside a string | |
1226 | since if it were then the comment ender would be inside one. | |
1227 | So it does start a comment. Skip back to it. */ | |
1228 | else if (comstart_parity == 0 && !string_lossage) | |
1229 | from = comstart_pos; | |
1230 | else | |
e5d4f4dc RS |
1231 | { |
1232 | /* We had two kinds of string delimiters mixed up | |
1233 | together. Decode this going forwards. | |
1234 | Scan fwd from the previous comment ender | |
1235 | to the one in question; this records where we | |
1236 | last passed a comment starter. */ | |
1237 | struct lisp_parse_state state; | |
37bef230 | 1238 | scan_sexps_forward (&state, find_defun_start (comment_end), |
340f92b5 | 1239 | comment_end - 1, -10000, 0, Qnil, 0); |
e5d4f4dc RS |
1240 | if (state.incomment) |
1241 | from = state.comstart; | |
1242 | else | |
1243 | /* We can't grok this as a comment; scan it normally. */ | |
1244 | from = comment_end; | |
1245 | } | |
8489eb67 RS |
1246 | } |
1247 | break; | |
1248 | ||
1249 | case Sstring: | |
1250 | stringterm = FETCH_CHAR (from); | |
1251 | while (1) | |
1252 | { | |
1253 | if (from == stop) goto lose; | |
1254 | if (!char_quoted (from - 1) | |
1255 | && stringterm == FETCH_CHAR (from - 1)) | |
1256 | break; | |
1257 | from--; | |
1258 | } | |
1259 | from--; | |
1260 | if (!depth && sexpflag) goto done2; | |
1261 | break; | |
1262 | } | |
1263 | } | |
1264 | ||
1265 | /* Reached start of buffer. Error if within object, return nil if between */ | |
1266 | if (depth) goto lose; | |
1267 | ||
1268 | immediate_quit = 0; | |
1269 | return Qnil; | |
1270 | ||
1271 | done2: | |
1272 | count++; | |
1273 | } | |
1274 | ||
1275 | ||
1276 | immediate_quit = 0; | |
1e142fb7 | 1277 | XSETFASTINT (val, from); |
8489eb67 RS |
1278 | return val; |
1279 | ||
1280 | lose: | |
1281 | error ("Unbalanced parentheses"); | |
1282 | /* NOTREACHED */ | |
1283 | } | |
1284 | ||
340f92b5 | 1285 | static int |
8489eb67 RS |
1286 | char_quoted (pos) |
1287 | register int pos; | |
1288 | { | |
1289 | register enum syntaxcode code; | |
1290 | register int beg = BEGV; | |
1291 | register int quoted = 0; | |
1292 | ||
1293 | while (pos > beg | |
1294 | && ((code = SYNTAX (FETCH_CHAR (pos - 1))) == Scharquote | |
1295 | || code == Sescape)) | |
1296 | pos--, quoted = !quoted; | |
1297 | return quoted; | |
1298 | } | |
1299 | ||
1300 | DEFUN ("scan-lists", Fscan_lists, Sscan_lists, 3, 3, 0, | |
1301 | "Scan from character number FROM by COUNT lists.\n\ | |
1302 | Returns the character number of the position thus found.\n\ | |
1303 | \n\ | |
1304 | If DEPTH is nonzero, paren depth begins counting from that value,\n\ | |
1305 | only places where the depth in parentheses becomes zero\n\ | |
1306 | are candidates for stopping; COUNT such places are counted.\n\ | |
1307 | Thus, a positive value for DEPTH means go out levels.\n\ | |
1308 | \n\ | |
1309 | Comments are ignored if `parse-sexp-ignore-comments' is non-nil.\n\ | |
1310 | \n\ | |
1311 | If the beginning or end of (the accessible part of) the buffer is reached\n\ | |
1312 | and the depth is wrong, an error is signaled.\n\ | |
1313 | If the depth is right but the count is not used up, nil is returned.") | |
1314 | (from, count, depth) | |
1315 | Lisp_Object from, count, depth; | |
1316 | { | |
1317 | CHECK_NUMBER (from, 0); | |
1318 | CHECK_NUMBER (count, 1); | |
1319 | CHECK_NUMBER (depth, 2); | |
1320 | ||
1321 | return scan_lists (XINT (from), XINT (count), XINT (depth), 0); | |
1322 | } | |
1323 | ||
1324 | DEFUN ("scan-sexps", Fscan_sexps, Sscan_sexps, 2, 2, 0, | |
1325 | "Scan from character number FROM by COUNT balanced expressions.\n\ | |
1326 | If COUNT is negative, scan backwards.\n\ | |
1327 | Returns the character number of the position thus found.\n\ | |
1328 | \n\ | |
1329 | Comments are ignored if `parse-sexp-ignore-comments' is non-nil.\n\ | |
1330 | \n\ | |
1331 | If the beginning or end of (the accessible part of) the buffer is reached\n\ | |
1332 | in the middle of a parenthetical grouping, an error is signaled.\n\ | |
1333 | If the beginning or end is reached between groupings\n\ | |
1334 | but before count is used up, nil is returned.") | |
1335 | (from, count) | |
1336 | Lisp_Object from, count; | |
1337 | { | |
1338 | CHECK_NUMBER (from, 0); | |
1339 | CHECK_NUMBER (count, 1); | |
1340 | ||
1341 | return scan_lists (XINT (from), XINT (count), 0, 1); | |
1342 | } | |
1343 | ||
1344 | DEFUN ("backward-prefix-chars", Fbackward_prefix_chars, Sbackward_prefix_chars, | |
1345 | 0, 0, 0, | |
1346 | "Move point backward over any number of chars with prefix syntax.\n\ | |
1347 | This includes chars with \"quote\" or \"prefix\" syntax (' or p).") | |
1348 | () | |
1349 | { | |
1350 | int beg = BEGV; | |
1351 | int pos = point; | |
1352 | ||
1353 | while (pos > beg && !char_quoted (pos - 1) | |
1354 | && (SYNTAX (FETCH_CHAR (pos - 1)) == Squote | |
1355 | || SYNTAX_PREFIX (FETCH_CHAR (pos - 1)))) | |
1356 | pos--; | |
1357 | ||
1358 | SET_PT (pos); | |
1359 | ||
1360 | return Qnil; | |
1361 | } | |
1362 | \f | |
8489eb67 | 1363 | /* Parse forward from FROM to END, |
e5d4f4dc RS |
1364 | assuming that FROM has state OLDSTATE (nil means FROM is start of function), |
1365 | and return a description of the state of the parse at END. | |
c81a3712 RS |
1366 | If STOPBEFORE is nonzero, stop at the start of an atom. |
1367 | If COMMENTSTOP is nonzero, stop at the start of a comment. */ | |
8489eb67 | 1368 | |
340f92b5 | 1369 | static void |
c81a3712 RS |
1370 | scan_sexps_forward (stateptr, from, end, targetdepth, |
1371 | stopbefore, oldstate, commentstop) | |
e5d4f4dc | 1372 | struct lisp_parse_state *stateptr; |
8489eb67 RS |
1373 | register int from; |
1374 | int end, targetdepth, stopbefore; | |
1375 | Lisp_Object oldstate; | |
c81a3712 | 1376 | int commentstop; |
8489eb67 RS |
1377 | { |
1378 | struct lisp_parse_state state; | |
1379 | ||
1380 | register enum syntaxcode code; | |
1381 | struct level { int last, prev; }; | |
1382 | struct level levelstart[100]; | |
1383 | register struct level *curlevel = levelstart; | |
1384 | struct level *endlevel = levelstart + 100; | |
1385 | char prev; | |
1386 | register int depth; /* Paren depth of current scanning location. | |
1387 | level - levelstart equals this except | |
1388 | when the depth becomes negative. */ | |
1389 | int mindepth; /* Lowest DEPTH value seen. */ | |
1390 | int start_quoted = 0; /* Nonzero means starting after a char quote */ | |
1391 | Lisp_Object tem; | |
1392 | ||
1393 | immediate_quit = 1; | |
1394 | QUIT; | |
1395 | ||
265a9e55 | 1396 | if (NILP (oldstate)) |
8489eb67 RS |
1397 | { |
1398 | depth = 0; | |
1399 | state.instring = -1; | |
1400 | state.incomment = 0; | |
e5d4f4dc | 1401 | state.comstyle = 0; /* comment style a by default */ |
8489eb67 RS |
1402 | } |
1403 | else | |
1404 | { | |
1405 | tem = Fcar (oldstate); | |
265a9e55 | 1406 | if (!NILP (tem)) |
8489eb67 RS |
1407 | depth = XINT (tem); |
1408 | else | |
1409 | depth = 0; | |
1410 | ||
1411 | oldstate = Fcdr (oldstate); | |
1412 | oldstate = Fcdr (oldstate); | |
1413 | oldstate = Fcdr (oldstate); | |
1414 | tem = Fcar (oldstate); | |
265a9e55 | 1415 | state.instring = !NILP (tem) ? XINT (tem) : -1; |
8489eb67 RS |
1416 | |
1417 | oldstate = Fcdr (oldstate); | |
1418 | tem = Fcar (oldstate); | |
265a9e55 | 1419 | state.incomment = !NILP (tem); |
8489eb67 RS |
1420 | |
1421 | oldstate = Fcdr (oldstate); | |
1422 | tem = Fcar (oldstate); | |
265a9e55 | 1423 | start_quoted = !NILP (tem); |
e5d4f4dc RS |
1424 | |
1425 | /* if the eight element of the list is nil, we are in comment | |
1426 | style a. if it is non-nil, we are in comment style b */ | |
1427 | oldstate = Fcdr (oldstate); | |
1428 | oldstate = Fcdr (oldstate); | |
e5d4f4dc RS |
1429 | tem = Fcar (oldstate); |
1430 | state.comstyle = !NILP (tem); | |
8489eb67 RS |
1431 | } |
1432 | state.quoted = 0; | |
1433 | mindepth = depth; | |
1434 | ||
1435 | curlevel->prev = -1; | |
1436 | curlevel->last = -1; | |
1437 | ||
1438 | /* Enter the loop at a place appropriate for initial state. */ | |
1439 | ||
1440 | if (state.incomment) goto startincomment; | |
1441 | if (state.instring >= 0) | |
1442 | { | |
1443 | if (start_quoted) goto startquotedinstring; | |
1444 | goto startinstring; | |
1445 | } | |
1446 | if (start_quoted) goto startquoted; | |
1447 | ||
1448 | while (from < end) | |
1449 | { | |
e5d4f4dc | 1450 | code = SYNTAX (FETCH_CHAR (from)); |
8489eb67 | 1451 | from++; |
8f9dc2ed RS |
1452 | if (code == Scomment) |
1453 | state.comstart = from-1; | |
1454 | ||
1455 | else if (from < end && SYNTAX_COMSTART_FIRST (FETCH_CHAR (from - 1)) | |
1456 | && SYNTAX_COMSTART_SECOND (FETCH_CHAR (from))) | |
e5d4f4dc RS |
1457 | { |
1458 | /* Record the comment style we have entered so that only | |
1459 | the comment-end sequence of the same style actually | |
1460 | terminates the comment section. */ | |
1461 | code = Scomment; | |
1462 | state.comstyle = SYNTAX_COMMENT_STYLE (FETCH_CHAR (from)); | |
8f9dc2ed | 1463 | state.comstart = from-1; |
e5d4f4dc RS |
1464 | from++; |
1465 | } | |
1466 | ||
8489eb67 RS |
1467 | if (SYNTAX_PREFIX (FETCH_CHAR (from - 1))) |
1468 | continue; | |
1469 | #ifdef SWITCH_ENUM_BUG | |
1470 | switch ((int) code) | |
1471 | #else | |
1472 | switch (code) | |
1473 | #endif | |
1474 | { | |
1475 | case Sescape: | |
1476 | case Scharquote: | |
1477 | if (stopbefore) goto stop; /* this arg means stop at sexp start */ | |
1478 | curlevel->last = from - 1; | |
1479 | startquoted: | |
1480 | if (from == end) goto endquoted; | |
1481 | from++; | |
1482 | goto symstarted; | |
1483 | /* treat following character as a word constituent */ | |
1484 | case Sword: | |
1485 | case Ssymbol: | |
1486 | if (stopbefore) goto stop; /* this arg means stop at sexp start */ | |
1487 | curlevel->last = from - 1; | |
1488 | symstarted: | |
1489 | while (from < end) | |
1490 | { | |
1491 | #ifdef SWITCH_ENUM_BUG | |
e5d4f4dc | 1492 | switch ((int) SYNTAX (FETCH_CHAR (from))) |
8489eb67 | 1493 | #else |
e5d4f4dc | 1494 | switch (SYNTAX (FETCH_CHAR (from))) |
8489eb67 RS |
1495 | #endif |
1496 | { | |
1497 | case Scharquote: | |
1498 | case Sescape: | |
1499 | from++; | |
1500 | if (from == end) goto endquoted; | |
1501 | break; | |
1502 | case Sword: | |
1503 | case Ssymbol: | |
1504 | case Squote: | |
1505 | break; | |
1506 | default: | |
1507 | goto symdone; | |
1508 | } | |
1509 | from++; | |
1510 | } | |
1511 | symdone: | |
1512 | curlevel->prev = curlevel->last; | |
1513 | break; | |
1514 | ||
5a28e48c RS |
1515 | startincomment: |
1516 | if (commentstop) | |
1517 | goto done; | |
1518 | if (from != BEGV) | |
1519 | { | |
1520 | /* Enter the loop in the middle so that we find | |
1521 | a 2-char comment ender if we start in the middle of it. */ | |
1522 | prev = FETCH_CHAR (from - 1); | |
1523 | goto startincomment_1; | |
1524 | } | |
1525 | /* At beginning of buffer, enter the loop the ordinary way. */ | |
1526 | ||
8489eb67 RS |
1527 | case Scomment: |
1528 | state.incomment = 1; | |
c81a3712 RS |
1529 | if (commentstop) |
1530 | goto done; | |
8489eb67 RS |
1531 | while (1) |
1532 | { | |
1533 | if (from == end) goto done; | |
e5d4f4dc RS |
1534 | prev = FETCH_CHAR (from); |
1535 | if (SYNTAX (prev) == Sendcomment | |
1536 | && SYNTAX_COMMENT_STYLE (prev) == state.comstyle) | |
1537 | /* Only terminate the comment section if the endcomment | |
1538 | of the same style as the start sequence has been | |
1539 | encountered. */ | |
8489eb67 RS |
1540 | break; |
1541 | from++; | |
5a28e48c | 1542 | startincomment_1: |
8489eb67 | 1543 | if (from < end && SYNTAX_COMEND_FIRST (prev) |
e5d4f4dc RS |
1544 | && SYNTAX_COMEND_SECOND (FETCH_CHAR (from)) |
1545 | && SYNTAX_COMMENT_STYLE (prev) == state.comstyle) | |
1546 | /* Only terminate the comment section if the end-comment | |
1547 | sequence of the same style as the start sequence has | |
1548 | been encountered. */ | |
8489eb67 RS |
1549 | { from++; break; } |
1550 | } | |
1551 | state.incomment = 0; | |
e5d4f4dc | 1552 | state.comstyle = 0; /* reset the comment style */ |
8489eb67 RS |
1553 | break; |
1554 | ||
1555 | case Sopen: | |
1556 | if (stopbefore) goto stop; /* this arg means stop at sexp start */ | |
1557 | depth++; | |
1558 | /* curlevel++->last ran into compiler bug on Apollo */ | |
1559 | curlevel->last = from - 1; | |
1560 | if (++curlevel == endlevel) | |
1561 | error ("Nesting too deep for parser"); | |
1562 | curlevel->prev = -1; | |
1563 | curlevel->last = -1; | |
1564 | if (!--targetdepth) goto done; | |
1565 | break; | |
1566 | ||
1567 | case Sclose: | |
1568 | depth--; | |
1569 | if (depth < mindepth) | |
1570 | mindepth = depth; | |
1571 | if (curlevel != levelstart) | |
1572 | curlevel--; | |
1573 | curlevel->prev = curlevel->last; | |
1574 | if (!++targetdepth) goto done; | |
1575 | break; | |
1576 | ||
1577 | case Sstring: | |
1578 | if (stopbefore) goto stop; /* this arg means stop at sexp start */ | |
1579 | curlevel->last = from - 1; | |
1580 | state.instring = FETCH_CHAR (from - 1); | |
1581 | startinstring: | |
1582 | while (1) | |
1583 | { | |
1584 | if (from >= end) goto done; | |
1585 | if (FETCH_CHAR (from) == state.instring) break; | |
1586 | #ifdef SWITCH_ENUM_BUG | |
e5d4f4dc | 1587 | switch ((int) SYNTAX (FETCH_CHAR (from))) |
8489eb67 | 1588 | #else |
e5d4f4dc | 1589 | switch (SYNTAX (FETCH_CHAR (from))) |
8489eb67 RS |
1590 | #endif |
1591 | { | |
1592 | case Scharquote: | |
1593 | case Sescape: | |
1594 | from++; | |
1595 | startquotedinstring: | |
1596 | if (from >= end) goto endquoted; | |
1597 | } | |
1598 | from++; | |
1599 | } | |
1600 | state.instring = -1; | |
1601 | curlevel->prev = curlevel->last; | |
1602 | from++; | |
1603 | break; | |
1604 | ||
1605 | case Smath: | |
1606 | break; | |
1607 | } | |
1608 | } | |
1609 | goto done; | |
1610 | ||
1611 | stop: /* Here if stopping before start of sexp. */ | |
1612 | from--; /* We have just fetched the char that starts it; */ | |
1613 | goto done; /* but return the position before it. */ | |
1614 | ||
1615 | endquoted: | |
1616 | state.quoted = 1; | |
1617 | done: | |
1618 | state.depth = depth; | |
1619 | state.mindepth = mindepth; | |
1620 | state.thislevelstart = curlevel->prev; | |
1621 | state.prevlevelstart | |
1622 | = (curlevel == levelstart) ? -1 : (curlevel - 1)->last; | |
1623 | state.location = from; | |
1624 | immediate_quit = 0; | |
1625 | ||
e5d4f4dc | 1626 | *stateptr = state; |
8489eb67 RS |
1627 | } |
1628 | ||
1629 | /* This comment supplies the doc string for parse-partial-sexp, | |
1630 | for make-docfile to see. We cannot put this in the real DEFUN | |
1631 | due to limits in the Unix cpp. | |
1632 | ||
c81a3712 | 1633 | DEFUN ("parse-partial-sexp", Ffoo, Sfoo, 2, 6, 0, |
8489eb67 RS |
1634 | "Parse Lisp syntax starting at FROM until TO; return status of parse at TO.\n\ |
1635 | Parsing stops at TO or when certain criteria are met;\n\ | |
1636 | point is set to where parsing stops.\n\ | |
1637 | If fifth arg STATE is omitted or nil,\n\ | |
1638 | parsing assumes that FROM is the beginning of a function.\n\ | |
e5d4f4dc | 1639 | Value is a list of eight elements describing final state of parsing:\n\ |
af50f9e5 RS |
1640 | 0. depth in parens.\n\ |
1641 | 1. character address of start of innermost containing list; nil if none.\n\ | |
1642 | 2. character address of start of last complete sexp terminated.\n\ | |
1643 | 3. non-nil if inside a string.\n\ | |
8489eb67 | 1644 | (it is the character that will terminate the string.)\n\ |
af50f9e5 RS |
1645 | 4. t if inside a comment.\n\ |
1646 | 5. t if following a quote character.\n\ | |
1647 | 6. the minimum paren-depth encountered during this scan.\n\ | |
1648 | 7. t if in a comment of style `b'.\n\ | |
8489eb67 RS |
1649 | If third arg TARGETDEPTH is non-nil, parsing stops if the depth\n\ |
1650 | in parentheses becomes equal to TARGETDEPTH.\n\ | |
1651 | Fourth arg STOPBEFORE non-nil means stop when come to\n\ | |
1652 | any character that starts a sexp.\n\ | |
ec11639d | 1653 | Fifth arg STATE is an eight-list like what this function returns.\n\ |
a4275ad1 | 1654 | It is used to initialize the state of the parse. Its second and third |
c81a3712 RS |
1655 | elements are ignored. |
1656 | Sixth args COMMENTSTOP non-nil means stop at the start of a comment.") | |
1657 | (from, to, targetdepth, stopbefore, state, commentstop) | |
8489eb67 RS |
1658 | */ |
1659 | ||
c81a3712 | 1660 | DEFUN ("parse-partial-sexp", Fparse_partial_sexp, Sparse_partial_sexp, 2, 6, 0, |
8489eb67 | 1661 | 0 /* See immediately above */) |
c81a3712 RS |
1662 | (from, to, targetdepth, stopbefore, oldstate, commentstop) |
1663 | Lisp_Object from, to, targetdepth, stopbefore, oldstate, commentstop; | |
8489eb67 RS |
1664 | { |
1665 | struct lisp_parse_state state; | |
1666 | int target; | |
1667 | ||
265a9e55 | 1668 | if (!NILP (targetdepth)) |
8489eb67 RS |
1669 | { |
1670 | CHECK_NUMBER (targetdepth, 3); | |
1671 | target = XINT (targetdepth); | |
1672 | } | |
1673 | else | |
1674 | target = -100000; /* We won't reach this depth */ | |
1675 | ||
1676 | validate_region (&from, &to); | |
e5d4f4dc | 1677 | scan_sexps_forward (&state, XINT (from), XINT (to), |
c81a3712 RS |
1678 | target, !NILP (stopbefore), oldstate, |
1679 | !NILP (commentstop)); | |
8489eb67 RS |
1680 | |
1681 | SET_PT (state.location); | |
1682 | ||
1683 | return Fcons (make_number (state.depth), | |
1684 | Fcons (state.prevlevelstart < 0 ? Qnil : make_number (state.prevlevelstart), | |
1685 | Fcons (state.thislevelstart < 0 ? Qnil : make_number (state.thislevelstart), | |
1686 | Fcons (state.instring >= 0 ? make_number (state.instring) : Qnil, | |
1687 | Fcons (state.incomment ? Qt : Qnil, | |
1688 | Fcons (state.quoted ? Qt : Qnil, | |
e5d4f4dc RS |
1689 | Fcons (make_number (state.mindepth), |
1690 | Fcons (state.comstyle ? Qt : Qnil, | |
1691 | Qnil)))))))); | |
8489eb67 RS |
1692 | } |
1693 | \f | |
1694 | init_syntax_once () | |
1695 | { | |
1696 | register int i; | |
1697 | register struct Lisp_Vector *v; | |
1698 | ||
1699 | /* Set this now, so first buffer creation can refer to it. */ | |
1700 | /* Make it nil before calling copy-syntax-table | |
1701 | so that copy-syntax-table will know not to try to copy from garbage */ | |
1702 | Vstandard_syntax_table = Qnil; | |
1703 | Vstandard_syntax_table = Fcopy_syntax_table (Qnil); | |
1704 | ||
1705 | v = XVECTOR (Vstandard_syntax_table); | |
1706 | ||
1707 | for (i = 'a'; i <= 'z'; i++) | |
1e142fb7 | 1708 | XSETFASTINT (v->contents[i], (int) Sword); |
8489eb67 | 1709 | for (i = 'A'; i <= 'Z'; i++) |
1e142fb7 | 1710 | XSETFASTINT (v->contents[i], (int) Sword); |
8489eb67 | 1711 | for (i = '0'; i <= '9'; i++) |
1e142fb7 KH |
1712 | XSETFASTINT (v->contents[i], (int) Sword); |
1713 | XSETFASTINT (v->contents['$'], (int) Sword); | |
1714 | XSETFASTINT (v->contents['%'], (int) Sword); | |
1715 | ||
1716 | XSETFASTINT (v->contents['('], (int) Sopen + (')' << 8)); | |
1717 | XSETFASTINT (v->contents[')'], (int) Sclose + ('(' << 8)); | |
1718 | XSETFASTINT (v->contents['['], (int) Sopen + (']' << 8)); | |
1719 | XSETFASTINT (v->contents[']'], (int) Sclose + ('[' << 8)); | |
1720 | XSETFASTINT (v->contents['{'], (int) Sopen + ('}' << 8)); | |
1721 | XSETFASTINT (v->contents['}'], (int) Sclose + ('{' << 8)); | |
1722 | XSETFASTINT (v->contents['"'], (int) Sstring); | |
1723 | XSETFASTINT (v->contents['\\'], (int) Sescape); | |
8489eb67 RS |
1724 | |
1725 | for (i = 0; i < 10; i++) | |
1e142fb7 | 1726 | XSETFASTINT (v->contents["_-+*/&|<>="[i]], (int) Ssymbol); |
8489eb67 RS |
1727 | |
1728 | for (i = 0; i < 12; i++) | |
1e142fb7 | 1729 | XSETFASTINT (v->contents[".,;:?!#@~^'`"[i]], (int) Spunct); |
8489eb67 RS |
1730 | } |
1731 | ||
1732 | syms_of_syntax () | |
1733 | { | |
1734 | Qsyntax_table_p = intern ("syntax-table-p"); | |
1735 | staticpro (&Qsyntax_table_p); | |
1736 | ||
1737 | DEFVAR_BOOL ("parse-sexp-ignore-comments", &parse_sexp_ignore_comments, | |
1738 | "Non-nil means `forward-sexp', etc., should treat comments as whitespace."); | |
1739 | ||
1740 | words_include_escapes = 0; | |
1741 | DEFVAR_BOOL ("words-include-escapes", &words_include_escapes, | |
1742 | "Non-nil means `forward-word', etc., should treat escape chars part of words."); | |
1743 | ||
1744 | defsubr (&Ssyntax_table_p); | |
1745 | defsubr (&Ssyntax_table); | |
1746 | defsubr (&Sstandard_syntax_table); | |
1747 | defsubr (&Scopy_syntax_table); | |
1748 | defsubr (&Sset_syntax_table); | |
1749 | defsubr (&Schar_syntax); | |
beefa22e | 1750 | defsubr (&Smatching_paren); |
8489eb67 RS |
1751 | defsubr (&Smodify_syntax_entry); |
1752 | defsubr (&Sdescribe_syntax); | |
1753 | ||
1754 | defsubr (&Sforward_word); | |
1755 | ||
b3cfe0c8 | 1756 | defsubr (&Sforward_comment); |
8489eb67 RS |
1757 | defsubr (&Sscan_lists); |
1758 | defsubr (&Sscan_sexps); | |
1759 | defsubr (&Sbackward_prefix_chars); | |
1760 | defsubr (&Sparse_partial_sexp); | |
1761 | } |