Commit | Line | Data |
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8489eb67 | 1 | /* GNU Emacs routines to deal with syntax tables; also word and list parsing. |
0220c518 | 2 | Copyright (C) 1985, 1987, 1993, 1994, 1995 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 | ||
5ebaddf5 | 28 | Lisp_Object Qsyntax_table_p, Qsyntax_table; |
8489eb67 | 29 | |
340f92b5 RS |
30 | static void scan_sexps_forward (); |
31 | static int char_quoted (); | |
32 | ||
8489eb67 RS |
33 | int words_include_escapes; |
34 | ||
8ea151b2 RS |
35 | /* Used as a temporary in SYNTAX_ENTRY and other macros in syntax.h, |
36 | if not compiled with GCC. No need to mark it, since it is used | |
37 | only very temporarily. */ | |
38 | Lisp_Object syntax_temp; | |
39 | ||
e5d4f4dc RS |
40 | /* This is the internal form of the parse state used in parse-partial-sexp. */ |
41 | ||
42 | struct lisp_parse_state | |
43 | { | |
44 | int depth; /* Depth at end of parsing */ | |
45 | int instring; /* -1 if not within string, else desired terminator. */ | |
46 | int incomment; /* Nonzero if within a comment at end of parsing */ | |
47 | int comstyle; /* comment style a=0, or b=1 */ | |
48 | int quoted; /* Nonzero if just after an escape char at end of parsing */ | |
49 | int thislevelstart; /* Char number of most recent start-of-expression at current level */ | |
50 | int prevlevelstart; /* Char number of start of containing expression */ | |
51 | int location; /* Char number at which parsing stopped. */ | |
52 | int mindepth; /* Minimum depth seen while scanning. */ | |
53 | int comstart; /* Position just after last comment starter. */ | |
54 | }; | |
55 | \f | |
37bef230 RS |
56 | /* These variables are a cache for finding the start of a defun. |
57 | find_start_pos is the place for which the defun start was found. | |
58 | find_start_value is the defun start position found for it. | |
59 | find_start_buffer is the buffer it was found in. | |
60 | find_start_begv is the BEGV value when it was found. | |
61 | find_start_modiff is the value of MODIFF when it was found. */ | |
62 | ||
63 | static int find_start_pos; | |
64 | static int find_start_value; | |
65 | static struct buffer *find_start_buffer; | |
66 | static int find_start_begv; | |
67 | static int find_start_modiff; | |
68 | ||
69 | /* Find a defun-start that is the last one before POS (or nearly the last). | |
70 | We record what we find, so that another call in the same area | |
71 | can return the same value right away. */ | |
72 | ||
73 | static int | |
74 | find_defun_start (pos) | |
75 | int pos; | |
76 | { | |
77 | int tem; | |
78 | int shortage; | |
79 | ||
80 | /* Use previous finding, if it's valid and applies to this inquiry. */ | |
81 | if (current_buffer == find_start_buffer | |
82 | /* Reuse the defun-start even if POS is a little farther on. | |
83 | POS might be in the next defun, but that's ok. | |
84 | Our value may not be the best possible, but will still be usable. */ | |
85 | && pos <= find_start_pos + 1000 | |
86 | && pos >= find_start_value | |
87 | && BEGV == find_start_begv | |
88 | && MODIFF == find_start_modiff) | |
89 | return find_start_value; | |
90 | ||
91 | /* Back up to start of line. */ | |
be5357e2 | 92 | tem = scan_buffer ('\n', pos, BEGV, -1, &shortage, 1); |
37bef230 RS |
93 | |
94 | while (tem > BEGV) | |
95 | { | |
96 | /* Open-paren at start of line means we found our defun-start. */ | |
97 | if (SYNTAX (FETCH_CHAR (tem)) == Sopen) | |
98 | break; | |
99 | /* Move to beg of previous line. */ | |
be5357e2 | 100 | tem = scan_buffer ('\n', tem, BEGV, -2, &shortage, 1); |
37bef230 RS |
101 | } |
102 | ||
103 | /* Record what we found, for the next try. */ | |
104 | find_start_value = tem; | |
105 | find_start_buffer = current_buffer; | |
106 | find_start_modiff = MODIFF; | |
107 | find_start_begv = BEGV; | |
108 | find_start_pos = pos; | |
109 | ||
110 | return find_start_value; | |
111 | } | |
112 | \f | |
8489eb67 | 113 | DEFUN ("syntax-table-p", Fsyntax_table_p, Ssyntax_table_p, 1, 1, 0, |
2203e1e8 | 114 | "Return t if OBJECT is a syntax table.\n\ |
8ea151b2 | 115 | Currently, any char-table counts as a syntax table.") |
2203e1e8 EN |
116 | (object) |
117 | Lisp_Object object; | |
8489eb67 | 118 | { |
2203e1e8 EN |
119 | if (CHAR_TABLE_P (object) |
120 | && XCHAR_TABLE (object)->purpose == Qsyntax_table) | |
8489eb67 RS |
121 | return Qt; |
122 | return Qnil; | |
123 | } | |
124 | ||
8ea151b2 | 125 | static void |
8489eb67 RS |
126 | check_syntax_table (obj) |
127 | Lisp_Object obj; | |
128 | { | |
d1be9f0f RS |
129 | if (!(CHAR_TABLE_P (obj) |
130 | && XCHAR_TABLE (obj)->purpose == Qsyntax_table)) | |
131 | wrong_type_argument (Qsyntax_table_p, obj); | |
8489eb67 RS |
132 | } |
133 | ||
8489eb67 RS |
134 | DEFUN ("syntax-table", Fsyntax_table, Ssyntax_table, 0, 0, 0, |
135 | "Return the current syntax table.\n\ | |
136 | This is the one specified by the current buffer.") | |
137 | () | |
138 | { | |
139 | return current_buffer->syntax_table; | |
140 | } | |
141 | ||
142 | DEFUN ("standard-syntax-table", Fstandard_syntax_table, | |
143 | Sstandard_syntax_table, 0, 0, 0, | |
144 | "Return the standard syntax table.\n\ | |
145 | This is the one used for new buffers.") | |
146 | () | |
147 | { | |
148 | return Vstandard_syntax_table; | |
149 | } | |
150 | ||
151 | DEFUN ("copy-syntax-table", Fcopy_syntax_table, Scopy_syntax_table, 0, 1, 0, | |
152 | "Construct a new syntax table and return it.\n\ | |
153 | It is a copy of the TABLE, which defaults to the standard syntax table.") | |
154 | (table) | |
155 | Lisp_Object table; | |
156 | { | |
8ea151b2 RS |
157 | Lisp_Object copy; |
158 | ||
265a9e55 | 159 | if (!NILP (table)) |
8ea151b2 RS |
160 | check_syntax_table (table); |
161 | else | |
162 | table = Vstandard_syntax_table; | |
163 | ||
164 | copy = Fcopy_sequence (table); | |
165 | Fset_char_table_parent (copy, Vstandard_syntax_table); | |
166 | return copy; | |
8489eb67 RS |
167 | } |
168 | ||
169 | DEFUN ("set-syntax-table", Fset_syntax_table, Sset_syntax_table, 1, 1, 0, | |
170 | "Select a new syntax table for the current buffer.\n\ | |
171 | One argument, a syntax table.") | |
172 | (table) | |
173 | Lisp_Object table; | |
174 | { | |
8ea151b2 | 175 | check_syntax_table (table); |
8489eb67 RS |
176 | current_buffer->syntax_table = table; |
177 | /* Indicate that this buffer now has a specified syntax table. */ | |
f110a664 RS |
178 | current_buffer->local_var_flags |
179 | |= XFASTINT (buffer_local_flags.syntax_table); | |
8489eb67 RS |
180 | return table; |
181 | } | |
182 | \f | |
183 | /* Convert a letter which signifies a syntax code | |
184 | into the code it signifies. | |
185 | This is used by modify-syntax-entry, and other things. */ | |
186 | ||
187 | unsigned char syntax_spec_code[0400] = | |
188 | { 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
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 | (char) Swhitespace, 0377, (char) Sstring, 0377, | |
193 | (char) Smath, 0377, 0377, (char) Squote, | |
194 | (char) Sopen, (char) Sclose, 0377, 0377, | |
195 | 0377, (char) Swhitespace, (char) Spunct, (char) Scharquote, | |
196 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
197 | 0377, 0377, 0377, 0377, | |
198 | (char) Scomment, 0377, (char) Sendcomment, 0377, | |
6cb71bf6 | 199 | (char) Sinherit, 0377, 0377, 0377, 0377, 0377, 0377, 0377, /* @, A ... */ |
8489eb67 RS |
200 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, |
201 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, (char) Sword, | |
202 | 0377, 0377, 0377, 0377, (char) Sescape, 0377, 0377, (char) Ssymbol, | |
203 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, /* `, a, ... */ | |
204 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
205 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, (char) Sword, | |
206 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377 | |
207 | }; | |
208 | ||
209 | /* Indexed by syntax code, give the letter that describes it. */ | |
210 | ||
6cb71bf6 | 211 | char syntax_code_spec[14] = |
8489eb67 | 212 | { |
6cb71bf6 | 213 | ' ', '.', 'w', '_', '(', ')', '\'', '\"', '$', '\\', '/', '<', '>', '@' |
8489eb67 RS |
214 | }; |
215 | \f | |
8ea151b2 RS |
216 | /* Look up the value for CHARACTER in syntax table TABLE's parent |
217 | and its parents. SYNTAX_ENTRY calls this, when TABLE itself has nil | |
218 | for CHARACTER. It's actually used only when not compiled with GCC. */ | |
219 | ||
220 | Lisp_Object | |
221 | syntax_parent_lookup (table, character) | |
222 | Lisp_Object table; | |
223 | int character; | |
224 | { | |
225 | Lisp_Object value; | |
226 | ||
227 | while (1) | |
228 | { | |
229 | table = XCHAR_TABLE (table)->parent; | |
230 | if (NILP (table)) | |
231 | return Qnil; | |
232 | ||
233 | value = XCHAR_TABLE (table)->contents[character]; | |
234 | if (!NILP (value)) | |
235 | return value; | |
236 | } | |
237 | } | |
238 | ||
8489eb67 | 239 | DEFUN ("char-syntax", Fchar_syntax, Schar_syntax, 1, 1, 0, |
2203e1e8 EN |
240 | "Return the syntax code of CHARACTER, described by a character.\n\ |
241 | For example, if CHARACTER is a word constituent,\n\ | |
242 | the character `w' is returned.\n\ | |
8489eb67 RS |
243 | The characters that correspond to various syntax codes\n\ |
244 | are listed in the documentation of `modify-syntax-entry'.") | |
2203e1e8 EN |
245 | (character) |
246 | Lisp_Object character; | |
8489eb67 | 247 | { |
8ea151b2 | 248 | int char_int; |
2203e1e8 EN |
249 | CHECK_NUMBER (character, 0); |
250 | char_int = XINT (character); | |
8ea151b2 | 251 | return make_number (syntax_code_spec[(int) SYNTAX (char_int)]); |
beefa22e RS |
252 | } |
253 | ||
254 | DEFUN ("matching-paren", Fmatching_paren, Smatching_paren, 1, 1, 0, | |
2203e1e8 EN |
255 | "Return the matching parenthesis of CHARACTER, or nil if none.") |
256 | (character) | |
257 | Lisp_Object character; | |
beefa22e | 258 | { |
8ea151b2 | 259 | int char_int, code; |
2203e1e8 EN |
260 | CHECK_NUMBER (character, 0); |
261 | char_int = XINT (character); | |
8ea151b2 | 262 | code = SYNTAX (char_int); |
a8bd7cd8 | 263 | if (code == Sopen || code == Sclose) |
8ea151b2 | 264 | return make_number (SYNTAX_MATCH (char_int)); |
beefa22e | 265 | return Qnil; |
8489eb67 RS |
266 | } |
267 | ||
268 | /* This comment supplies the doc string for modify-syntax-entry, | |
269 | for make-docfile to see. We cannot put this in the real DEFUN | |
270 | due to limits in the Unix cpp. | |
271 | ||
2fcea188 | 272 | DEFUN ("modify-syntax-entry", foo, bar, 2, 3, 0, |
8489eb67 RS |
273 | "Set syntax for character CHAR according to string S.\n\ |
274 | The syntax is changed only for table TABLE, which defaults to\n\ | |
275 | the current buffer's syntax table.\n\ | |
276 | The first character of S should be one of the following:\n\ | |
32676c08 JB |
277 | Space or - whitespace syntax. w word constituent.\n\ |
278 | _ symbol constituent. . punctuation.\n\ | |
279 | ( open-parenthesis. ) close-parenthesis.\n\ | |
280 | \" string quote. \\ escape.\n\ | |
281 | $ paired delimiter. ' expression quote or prefix operator.\n\ | |
abae13bd | 282 | < comment starter. > comment ender.\n\ |
6cb71bf6 | 283 | / character-quote. @ inherit from `standard-syntax-table'.\n\ |
abae13bd | 284 | \n\ |
8489eb67 RS |
285 | Only single-character comment start and end sequences are represented thus.\n\ |
286 | Two-character sequences are represented as described below.\n\ | |
287 | The second character of S is the matching parenthesis,\n\ | |
288 | used only if the first character is `(' or `)'.\n\ | |
289 | Any additional characters are flags.\n\ | |
e5d4f4dc | 290 | Defined flags are the characters 1, 2, 3, 4, b, and p.\n\ |
2203e1e8 EN |
291 | 1 means CHAR is the start of a two-char comment start sequence.\n\ |
292 | 2 means CHAR is the second character of such a sequence.\n\ | |
293 | 3 means CHAR is the start of a two-char comment end sequence.\n\ | |
294 | 4 means CHAR is the second character of such a sequence.\n\ | |
e5d4f4dc RS |
295 | \n\ |
296 | There can be up to two orthogonal comment sequences. This is to support\n\ | |
297 | language modes such as C++. By default, all comment sequences are of style\n\ | |
abae13bd RS |
298 | a, but you can set the comment sequence style to b (on the second character\n\ |
299 | of a comment-start, or the first character of a comment-end sequence) using\n\ | |
e5d4f4dc | 300 | this flag:\n\ |
2203e1e8 | 301 | b means CHAR is part of comment sequence b.\n\ |
e5d4f4dc | 302 | \n\ |
2203e1e8 | 303 | p means CHAR is a prefix character for `backward-prefix-chars';\n\ |
e5d4f4dc | 304 | such characters are treated as whitespace when they occur\n\ |
8489eb67 | 305 | between expressions.") |
2fcea188 | 306 | (char, s, table) |
8489eb67 RS |
307 | */ |
308 | ||
309 | DEFUN ("modify-syntax-entry", Fmodify_syntax_entry, Smodify_syntax_entry, 2, 3, | |
310 | /* I really don't know why this is interactive | |
311 | help-form should at least be made useful whilst reading the second arg | |
312 | */ | |
313 | "cSet syntax for character: \nsSet syntax for %s to: ", | |
314 | 0 /* See immediately above */) | |
315 | (c, newentry, syntax_table) | |
316 | Lisp_Object c, newentry, syntax_table; | |
317 | { | |
8ea151b2 | 318 | register unsigned char *p; |
8489eb67 | 319 | register enum syntaxcode code; |
247e20a8 | 320 | int val; |
8ea151b2 | 321 | Lisp_Object match; |
8489eb67 RS |
322 | |
323 | CHECK_NUMBER (c, 0); | |
324 | CHECK_STRING (newentry, 1); | |
8ea151b2 | 325 | |
265a9e55 | 326 | if (NILP (syntax_table)) |
8489eb67 RS |
327 | syntax_table = current_buffer->syntax_table; |
328 | else | |
8ea151b2 | 329 | check_syntax_table (syntax_table); |
8489eb67 RS |
330 | |
331 | p = XSTRING (newentry)->data; | |
332 | code = (enum syntaxcode) syntax_spec_code[*p++]; | |
333 | if (((int) code & 0377) == 0377) | |
334 | error ("invalid syntax description letter: %c", c); | |
335 | ||
8ea151b2 RS |
336 | if (code == Sinherit) |
337 | { | |
338 | SET_RAW_SYNTAX_ENTRY (syntax_table, c, Qnil); | |
339 | return Qnil; | |
340 | } | |
341 | ||
342 | if (*p) | |
d1be9f0f RS |
343 | { |
344 | XSETINT (match, *p++); | |
345 | if (XFASTINT (match) == ' ') | |
346 | match = Qnil; | |
347 | } | |
348 | else | |
8ea151b2 | 349 | match = Qnil; |
8489eb67 | 350 | |
8ea151b2 | 351 | val = (int) code; |
8489eb67 RS |
352 | while (*p) |
353 | switch (*p++) | |
354 | { | |
355 | case '1': | |
247e20a8 | 356 | val |= 1 << 16; |
8489eb67 RS |
357 | break; |
358 | ||
359 | case '2': | |
247e20a8 | 360 | val |= 1 << 17; |
8489eb67 RS |
361 | break; |
362 | ||
363 | case '3': | |
247e20a8 | 364 | val |= 1 << 18; |
8489eb67 RS |
365 | break; |
366 | ||
367 | case '4': | |
247e20a8 | 368 | val |= 1 << 19; |
8489eb67 RS |
369 | break; |
370 | ||
371 | case 'p': | |
247e20a8 | 372 | val |= 1 << 20; |
8489eb67 | 373 | break; |
e5d4f4dc RS |
374 | |
375 | case 'b': | |
247e20a8 | 376 | val |= 1 << 21; |
e5d4f4dc | 377 | break; |
8489eb67 RS |
378 | } |
379 | ||
8ea151b2 RS |
380 | SET_RAW_SYNTAX_ENTRY (syntax_table, c, |
381 | Fcons (make_number (val), match)); | |
8489eb67 RS |
382 | |
383 | return Qnil; | |
384 | } | |
385 | \f | |
386 | /* Dump syntax table to buffer in human-readable format */ | |
387 | ||
340f92b5 | 388 | static void |
8489eb67 RS |
389 | describe_syntax (value) |
390 | Lisp_Object value; | |
391 | { | |
392 | register enum syntaxcode code; | |
e5d4f4dc | 393 | char desc, match, start1, start2, end1, end2, prefix, comstyle; |
8489eb67 | 394 | char str[2]; |
8ea151b2 | 395 | Lisp_Object first, match_lisp; |
8489eb67 RS |
396 | |
397 | Findent_to (make_number (16), make_number (1)); | |
398 | ||
8ea151b2 RS |
399 | if (NILP (value)) |
400 | { | |
401 | insert_string ("inherit"); | |
402 | return; | |
403 | } | |
404 | ||
405 | if (!CONSP (value)) | |
406 | { | |
407 | insert_string ("invalid"); | |
408 | return; | |
409 | } | |
410 | ||
411 | first = XCONS (value)->car; | |
412 | match_lisp = XCONS (value)->cdr; | |
413 | ||
414 | if (!INTEGERP (first) || !(NILP (match_lisp) || INTEGERP (match_lisp))) | |
8489eb67 RS |
415 | { |
416 | insert_string ("invalid"); | |
417 | return; | |
418 | } | |
419 | ||
8ea151b2 RS |
420 | code = (enum syntaxcode) (first & 0377); |
421 | start1 = (XINT (first) >> 16) & 1; | |
422 | start2 = (XINT (first) >> 17) & 1; | |
423 | end1 = (XINT (first) >> 18) & 1; | |
424 | end2 = (XINT (first) >> 19) & 1; | |
425 | prefix = (XINT (first) >> 20) & 1; | |
426 | comstyle = (XINT (first) >> 21) & 1; | |
8489eb67 RS |
427 | |
428 | if ((int) code < 0 || (int) code >= (int) Smax) | |
429 | { | |
430 | insert_string ("invalid"); | |
431 | return; | |
432 | } | |
433 | desc = syntax_code_spec[(int) code]; | |
434 | ||
435 | str[0] = desc, str[1] = 0; | |
436 | insert (str, 1); | |
437 | ||
8ea151b2 | 438 | str[0] = !NILP (match_lisp) ? XINT (match_lisp) : ' '; |
8489eb67 RS |
439 | insert (str, 1); |
440 | ||
8489eb67 RS |
441 | if (start1) |
442 | insert ("1", 1); | |
443 | if (start2) | |
444 | insert ("2", 1); | |
445 | ||
446 | if (end1) | |
447 | insert ("3", 1); | |
448 | if (end2) | |
449 | insert ("4", 1); | |
450 | ||
451 | if (prefix) | |
452 | insert ("p", 1); | |
e5d4f4dc RS |
453 | if (comstyle) |
454 | insert ("b", 1); | |
8489eb67 RS |
455 | |
456 | insert_string ("\twhich means: "); | |
457 | ||
0220c518 | 458 | switch (SWITCH_ENUM_CAST (code)) |
8489eb67 RS |
459 | { |
460 | case Swhitespace: | |
461 | insert_string ("whitespace"); break; | |
462 | case Spunct: | |
463 | insert_string ("punctuation"); break; | |
464 | case Sword: | |
465 | insert_string ("word"); break; | |
466 | case Ssymbol: | |
467 | insert_string ("symbol"); break; | |
468 | case Sopen: | |
469 | insert_string ("open"); break; | |
470 | case Sclose: | |
471 | insert_string ("close"); break; | |
472 | case Squote: | |
473 | insert_string ("quote"); break; | |
474 | case Sstring: | |
475 | insert_string ("string"); break; | |
476 | case Smath: | |
477 | insert_string ("math"); break; | |
478 | case Sescape: | |
479 | insert_string ("escape"); break; | |
480 | case Scharquote: | |
481 | insert_string ("charquote"); break; | |
482 | case Scomment: | |
483 | insert_string ("comment"); break; | |
484 | case Sendcomment: | |
485 | insert_string ("endcomment"); break; | |
486 | default: | |
487 | insert_string ("invalid"); | |
488 | return; | |
489 | } | |
490 | ||
8ea151b2 | 491 | if (!NILP (match_lisp)) |
8489eb67 RS |
492 | { |
493 | insert_string (", matches "); | |
8ea151b2 | 494 | insert_char (XINT (match_lisp)); |
8489eb67 RS |
495 | } |
496 | ||
497 | if (start1) | |
498 | insert_string (",\n\t is the first character of a comment-start sequence"); | |
499 | if (start2) | |
500 | insert_string (",\n\t is the second character of a comment-start sequence"); | |
501 | ||
502 | if (end1) | |
503 | insert_string (",\n\t is the first character of a comment-end sequence"); | |
504 | if (end2) | |
505 | insert_string (",\n\t is the second character of a comment-end sequence"); | |
e5d4f4dc RS |
506 | if (comstyle) |
507 | insert_string (" (comment style b)"); | |
508 | ||
8489eb67 RS |
509 | if (prefix) |
510 | insert_string (",\n\t is a prefix character for `backward-prefix-chars'"); | |
511 | ||
512 | insert_string ("\n"); | |
513 | } | |
514 | ||
340f92b5 | 515 | static Lisp_Object |
8489eb67 RS |
516 | describe_syntax_1 (vector) |
517 | Lisp_Object vector; | |
518 | { | |
519 | struct buffer *old = current_buffer; | |
520 | set_buffer_internal (XBUFFER (Vstandard_output)); | |
5588734e | 521 | describe_vector (vector, Qnil, describe_syntax, 0, Qnil, Qnil); |
36cd82fe | 522 | call0 (intern ("help-mode")); |
8489eb67 RS |
523 | set_buffer_internal (old); |
524 | return Qnil; | |
525 | } | |
526 | ||
527 | DEFUN ("describe-syntax", Fdescribe_syntax, Sdescribe_syntax, 0, 0, "", | |
528 | "Describe the syntax specifications in the syntax table.\n\ | |
529 | The descriptions are inserted in a buffer, which is then displayed.") | |
530 | () | |
531 | { | |
532 | internal_with_output_to_temp_buffer | |
533 | ("*Help*", describe_syntax_1, current_buffer->syntax_table); | |
534 | ||
535 | return Qnil; | |
536 | } | |
537 | \f | |
538 | /* Return the position across COUNT words from FROM. | |
539 | If that many words cannot be found before the end of the buffer, return 0. | |
540 | COUNT negative means scan backward and stop at word beginning. */ | |
541 | ||
542 | scan_words (from, count) | |
543 | register int from, count; | |
544 | { | |
545 | register int beg = BEGV; | |
546 | register int end = ZV; | |
547 | register int code; | |
8ea151b2 | 548 | int charcode; |
8489eb67 RS |
549 | |
550 | immediate_quit = 1; | |
551 | QUIT; | |
552 | ||
553 | while (count > 0) | |
554 | { | |
555 | while (1) | |
556 | { | |
557 | if (from == end) | |
558 | { | |
559 | immediate_quit = 0; | |
560 | return 0; | |
561 | } | |
8ea151b2 RS |
562 | charcode = FETCH_CHAR (from); |
563 | code = SYNTAX (charcode); | |
8489eb67 RS |
564 | if (words_include_escapes |
565 | && (code == Sescape || code == Scharquote)) | |
566 | break; | |
567 | if (code == Sword) | |
568 | break; | |
569 | from++; | |
570 | } | |
571 | while (1) | |
572 | { | |
573 | if (from == end) break; | |
8ea151b2 RS |
574 | charcode = FETCH_CHAR (from); |
575 | code = SYNTAX (charcode); | |
8489eb67 RS |
576 | if (!(words_include_escapes |
577 | && (code == Sescape || code == Scharquote))) | |
578 | if (code != Sword) | |
579 | break; | |
580 | from++; | |
581 | } | |
582 | count--; | |
583 | } | |
584 | while (count < 0) | |
585 | { | |
586 | while (1) | |
587 | { | |
588 | if (from == beg) | |
589 | { | |
590 | immediate_quit = 0; | |
591 | return 0; | |
592 | } | |
8ea151b2 RS |
593 | charcode = FETCH_CHAR (from - 1); |
594 | code = SYNTAX (charcode); | |
8489eb67 RS |
595 | if (words_include_escapes |
596 | && (code == Sescape || code == Scharquote)) | |
597 | break; | |
598 | if (code == Sword) | |
599 | break; | |
600 | from--; | |
601 | } | |
602 | while (1) | |
603 | { | |
604 | if (from == beg) break; | |
8ea151b2 RS |
605 | charcode = FETCH_CHAR (from - 1); |
606 | code = SYNTAX (charcode); | |
8489eb67 RS |
607 | if (!(words_include_escapes |
608 | && (code == Sescape || code == Scharquote))) | |
609 | if (code != Sword) | |
610 | break; | |
611 | from--; | |
612 | } | |
613 | count++; | |
614 | } | |
615 | ||
616 | immediate_quit = 0; | |
617 | ||
618 | return from; | |
619 | } | |
620 | ||
621 | DEFUN ("forward-word", Fforward_word, Sforward_word, 1, 1, "p", | |
622 | "Move point forward ARG words (backward if ARG is negative).\n\ | |
623 | Normally returns t.\n\ | |
624 | If an edge of the buffer is reached, point is left there\n\ | |
625 | and nil is returned.") | |
626 | (count) | |
627 | Lisp_Object count; | |
628 | { | |
629 | int val; | |
630 | CHECK_NUMBER (count, 0); | |
631 | ||
632 | if (!(val = scan_words (point, XINT (count)))) | |
633 | { | |
634 | SET_PT (XINT (count) > 0 ? ZV : BEGV); | |
635 | return Qnil; | |
636 | } | |
637 | SET_PT (val); | |
638 | return Qt; | |
639 | } | |
640 | \f | |
b3cfe0c8 RS |
641 | DEFUN ("forward-comment", Fforward_comment, Sforward_comment, 1, 1, 0, |
642 | "Move forward across up to N comments. If N is negative, move backward.\n\ | |
b3cfe0c8 | 643 | Stop scanning if we find something other than a comment or whitespace.\n\ |
c81a3712 | 644 | Set point to where scanning stops.\n\ |
b3cfe0c8 RS |
645 | If N comments are found as expected, with nothing except whitespace\n\ |
646 | between them, return t; otherwise return nil.") | |
647 | (count) | |
840f481c | 648 | Lisp_Object count; |
b3cfe0c8 RS |
649 | { |
650 | register int from; | |
651 | register int stop; | |
8ea151b2 | 652 | register int c, c1; |
b3cfe0c8 RS |
653 | register enum syntaxcode code; |
654 | int comstyle = 0; /* style of comment encountered */ | |
be720845 | 655 | int found; |
840f481c RS |
656 | int count1; |
657 | ||
658 | CHECK_NUMBER (count, 0); | |
659 | count1 = XINT (count); | |
b3cfe0c8 RS |
660 | |
661 | immediate_quit = 1; | |
662 | QUIT; | |
663 | ||
664 | from = PT; | |
665 | ||
840f481c | 666 | while (count1 > 0) |
b3cfe0c8 RS |
667 | { |
668 | stop = ZV; | |
04882296 | 669 | do |
b3cfe0c8 | 670 | { |
04882296 KH |
671 | if (from == stop) |
672 | { | |
673 | SET_PT (from); | |
b7e6e612 | 674 | immediate_quit = 0; |
04882296 KH |
675 | return Qnil; |
676 | } | |
b3cfe0c8 RS |
677 | c = FETCH_CHAR (from); |
678 | code = SYNTAX (c); | |
679 | from++; | |
680 | comstyle = 0; | |
681 | if (from < stop && SYNTAX_COMSTART_FIRST (c) | |
8ea151b2 RS |
682 | && (c1 = FETCH_CHAR (from), |
683 | SYNTAX_COMSTART_SECOND (c1))) | |
b3cfe0c8 | 684 | { |
7fc8191e RS |
685 | /* We have encountered a comment start sequence and we |
686 | are ignoring all text inside comments. We must record | |
b3cfe0c8 RS |
687 | the comment style this sequence begins so that later, |
688 | only a comment end of the same style actually ends | |
7fc8191e | 689 | the comment section. */ |
b3cfe0c8 | 690 | code = Scomment; |
8ea151b2 | 691 | comstyle = SYNTAX_COMMENT_STYLE (c1); |
b3cfe0c8 RS |
692 | from++; |
693 | } | |
04882296 KH |
694 | } |
695 | while (code == Swhitespace || code == Sendcomment); | |
696 | if (code != Scomment) | |
697 | { | |
698 | immediate_quit = 0; | |
699 | SET_PT (from - 1); | |
700 | return Qnil; | |
701 | } | |
702 | /* We're at the start of a comment. */ | |
703 | while (1) | |
704 | { | |
705 | if (from == stop) | |
b3cfe0c8 RS |
706 | { |
707 | immediate_quit = 0; | |
04882296 | 708 | SET_PT (from); |
b3cfe0c8 RS |
709 | return Qnil; |
710 | } | |
04882296 | 711 | c = FETCH_CHAR (from); |
2eb1d6a2 | 712 | from++; |
04882296 KH |
713 | if (SYNTAX (c) == Sendcomment |
714 | && SYNTAX_COMMENT_STYLE (c) == comstyle) | |
715 | /* we have encountered a comment end of the same style | |
716 | as the comment sequence which began this comment | |
717 | section */ | |
718 | break; | |
04882296 | 719 | if (from < stop && SYNTAX_COMEND_FIRST (c) |
8ea151b2 RS |
720 | && (c1 = FETCH_CHAR (from), |
721 | SYNTAX_COMEND_SECOND (c1)) | |
04882296 KH |
722 | && SYNTAX_COMMENT_STYLE (c) == comstyle) |
723 | /* we have encountered a comment end of the same style | |
724 | as the comment sequence which began this comment | |
725 | section */ | |
726 | { from++; break; } | |
b3cfe0c8 | 727 | } |
04882296 | 728 | /* We have skipped one comment. */ |
840f481c | 729 | count1--; |
b3cfe0c8 RS |
730 | } |
731 | ||
840f481c | 732 | while (count1 < 0) |
b3cfe0c8 RS |
733 | { |
734 | stop = BEGV; | |
735 | while (from > stop) | |
736 | { | |
737 | int quoted; | |
738 | ||
739 | from--; | |
740 | quoted = char_quoted (from); | |
741 | if (quoted) | |
742 | from--; | |
743 | c = FETCH_CHAR (from); | |
744 | code = SYNTAX (c); | |
745 | comstyle = 0; | |
7fc8191e RS |
746 | if (code == Sendcomment) |
747 | comstyle = SYNTAX_COMMENT_STYLE (c); | |
b3cfe0c8 | 748 | if (from > stop && SYNTAX_COMEND_SECOND (c) |
8ea151b2 RS |
749 | && (c1 = FETCH_CHAR (from - 1), |
750 | SYNTAX_COMEND_FIRST (c1)) | |
b3cfe0c8 RS |
751 | && !char_quoted (from - 1)) |
752 | { | |
7fc8191e | 753 | /* We must record the comment style encountered so that |
b3cfe0c8 | 754 | later, we can match only the proper comment begin |
7fc8191e | 755 | sequence of the same style. */ |
b3cfe0c8 | 756 | code = Sendcomment; |
8ea151b2 | 757 | comstyle = SYNTAX_COMMENT_STYLE (c1); |
b3cfe0c8 RS |
758 | from--; |
759 | } | |
760 | ||
761 | if (code == Sendcomment && !quoted) | |
762 | { | |
8f9dc2ed | 763 | #if 0 |
b3cfe0c8 RS |
764 | if (code != SYNTAX (c)) |
765 | /* For a two-char comment ender, we can assume | |
766 | it does end a comment. So scan back in a simple way. */ | |
767 | { | |
768 | if (from != stop) from--; | |
769 | while (1) | |
770 | { | |
8ea151b2 RS |
771 | if ((c = FETCH_CHAR (from), |
772 | SYNTAX (c) == Scomment) | |
b3cfe0c8 RS |
773 | && SYNTAX_COMMENT_STYLE (c) == comstyle) |
774 | break; | |
775 | if (from == stop) | |
776 | { | |
777 | immediate_quit = 0; | |
c81a3712 | 778 | SET_PT (from); |
b3cfe0c8 RS |
779 | return Qnil; |
780 | } | |
781 | from--; | |
782 | if (SYNTAX_COMSTART_SECOND (c) | |
8ea151b2 RS |
783 | && (c1 = FETCH_CHAR (from), |
784 | SYNTAX_COMSTART_FIRST (c1)) | |
b3cfe0c8 RS |
785 | && SYNTAX_COMMENT_STYLE (c) == comstyle |
786 | && !char_quoted (from)) | |
787 | break; | |
788 | } | |
789 | break; | |
790 | } | |
8f9dc2ed | 791 | #endif /* 0 */ |
b3cfe0c8 RS |
792 | |
793 | /* Look back, counting the parity of string-quotes, | |
794 | and recording the comment-starters seen. | |
795 | When we reach a safe place, assume that's not in a string; | |
796 | then step the main scan to the earliest comment-starter seen | |
797 | an even number of string quotes away from the safe place. | |
798 | ||
799 | OFROM[I] is position of the earliest comment-starter seen | |
800 | which is I+2X quotes from the comment-end. | |
801 | PARITY is current parity of quotes from the comment end. */ | |
802 | { | |
803 | int parity = 0; | |
804 | char my_stringend = 0; | |
805 | int string_lossage = 0; | |
806 | int comment_end = from; | |
807 | int comstart_pos = 0; | |
808 | int comstart_parity = 0; | |
4841063f | 809 | int scanstart = from - 1; |
b3cfe0c8 RS |
810 | |
811 | /* At beginning of range to scan, we're outside of strings; | |
812 | that determines quote parity to the comment-end. */ | |
813 | while (from != stop) | |
814 | { | |
815 | /* Move back and examine a character. */ | |
816 | from--; | |
817 | ||
818 | c = FETCH_CHAR (from); | |
819 | code = SYNTAX (c); | |
820 | ||
821 | /* If this char is the second of a 2-char comment sequence, | |
822 | back up and give the pair the appropriate syntax. */ | |
823 | if (from > stop && SYNTAX_COMEND_SECOND (c) | |
824 | && SYNTAX_COMEND_FIRST (FETCH_CHAR (from - 1))) | |
825 | { | |
826 | code = Sendcomment; | |
827 | from--; | |
4841063f | 828 | c = FETCH_CHAR (from); |
b3cfe0c8 RS |
829 | } |
830 | ||
4841063f RS |
831 | /* If this char starts a 2-char comment start sequence, |
832 | treat it like a 1-char comment starter. */ | |
833 | if (from < scanstart && SYNTAX_COMSTART_FIRST (c) | |
834 | && SYNTAX_COMSTART_SECOND (FETCH_CHAR (from + 1)) | |
835 | && comstyle == SYNTAX_COMMENT_STYLE (FETCH_CHAR (from + 1))) | |
836 | code = Scomment; | |
b3cfe0c8 RS |
837 | |
838 | /* Ignore escaped characters. */ | |
839 | if (char_quoted (from)) | |
840 | continue; | |
841 | ||
842 | /* Track parity of quotes. */ | |
843 | if (code == Sstring) | |
844 | { | |
845 | parity ^= 1; | |
846 | if (my_stringend == 0) | |
847 | my_stringend = c; | |
848 | /* If we have two kinds of string delimiters. | |
849 | There's no way to grok this scanning backwards. */ | |
850 | else if (my_stringend != c) | |
851 | string_lossage = 1; | |
852 | } | |
853 | ||
854 | /* Record comment-starters according to that | |
855 | quote-parity to the comment-end. */ | |
856 | if (code == Scomment) | |
857 | { | |
858 | comstart_parity = parity; | |
859 | comstart_pos = from; | |
860 | } | |
861 | ||
862 | /* If we find another earlier comment-ender, | |
eb8c3be9 | 863 | any comment-starts earlier than that don't count |
b3cfe0c8 RS |
864 | (because they go with the earlier comment-ender). */ |
865 | if (code == Sendcomment | |
866 | && SYNTAX_COMMENT_STYLE (FETCH_CHAR (from)) == comstyle) | |
867 | break; | |
868 | ||
869 | /* Assume a defun-start point is outside of strings. */ | |
870 | if (code == Sopen | |
871 | && (from == stop || FETCH_CHAR (from - 1) == '\n')) | |
872 | break; | |
873 | } | |
874 | ||
875 | if (comstart_pos == 0) | |
876 | from = comment_end; | |
877 | /* If the earliest comment starter | |
878 | is followed by uniform paired string quotes or none, | |
879 | we know it can't be inside a string | |
880 | since if it were then the comment ender would be inside one. | |
881 | So it does start a comment. Skip back to it. */ | |
882 | else if (comstart_parity == 0 && !string_lossage) | |
883 | from = comstart_pos; | |
884 | else | |
885 | { | |
886 | /* We had two kinds of string delimiters mixed up | |
887 | together. Decode this going forwards. | |
888 | Scan fwd from the previous comment ender | |
889 | to the one in question; this records where we | |
890 | last passed a comment starter. */ | |
891 | struct lisp_parse_state state; | |
892 | scan_sexps_forward (&state, find_defun_start (comment_end), | |
340f92b5 | 893 | comment_end - 1, -10000, 0, Qnil, 0); |
b3cfe0c8 RS |
894 | if (state.incomment) |
895 | from = state.comstart; | |
896 | else | |
897 | /* We can't grok this as a comment; scan it normally. */ | |
898 | from = comment_end; | |
899 | } | |
900 | } | |
7fc8191e RS |
901 | /* We have skipped one comment. */ |
902 | break; | |
b3cfe0c8 | 903 | } |
c81a3712 | 904 | else if ((code != Swhitespace && code != Scomment) || quoted) |
b3cfe0c8 RS |
905 | { |
906 | immediate_quit = 0; | |
c81a3712 | 907 | SET_PT (from + 1); |
b3cfe0c8 RS |
908 | return Qnil; |
909 | } | |
910 | } | |
911 | ||
840f481c | 912 | count1++; |
b3cfe0c8 RS |
913 | } |
914 | ||
915 | SET_PT (from); | |
916 | immediate_quit = 0; | |
917 | return Qt; | |
918 | } | |
919 | \f | |
8489eb67 RS |
920 | int parse_sexp_ignore_comments; |
921 | ||
922 | Lisp_Object | |
923 | scan_lists (from, count, depth, sexpflag) | |
924 | register int from; | |
925 | int count, depth, sexpflag; | |
926 | { | |
927 | Lisp_Object val; | |
928 | register int stop; | |
929 | register int c; | |
ee384542 | 930 | unsigned char stringterm; |
8489eb67 RS |
931 | int quoted; |
932 | int mathexit = 0; | |
933 | register enum syntaxcode code; | |
934 | int min_depth = depth; /* Err out if depth gets less than this. */ | |
e5d4f4dc | 935 | int comstyle = 0; /* style of comment encountered */ |
8489eb67 RS |
936 | |
937 | if (depth > 0) min_depth = 0; | |
938 | ||
939 | immediate_quit = 1; | |
940 | QUIT; | |
941 | ||
942 | while (count > 0) | |
943 | { | |
944 | stop = ZV; | |
945 | while (from < stop) | |
946 | { | |
947 | c = FETCH_CHAR (from); | |
e5d4f4dc | 948 | code = SYNTAX (c); |
8489eb67 RS |
949 | from++; |
950 | if (from < stop && SYNTAX_COMSTART_FIRST (c) | |
951 | && SYNTAX_COMSTART_SECOND (FETCH_CHAR (from)) | |
952 | && parse_sexp_ignore_comments) | |
e5d4f4dc RS |
953 | { |
954 | /* we have encountered a comment start sequence and we | |
955 | are ignoring all text inside comments. we must record | |
956 | the comment style this sequence begins so that later, | |
957 | only a comment end of the same style actually ends | |
958 | the comment section */ | |
959 | code = Scomment; | |
960 | comstyle = SYNTAX_COMMENT_STYLE (FETCH_CHAR (from)); | |
961 | from++; | |
962 | } | |
963 | ||
8489eb67 RS |
964 | if (SYNTAX_PREFIX (c)) |
965 | continue; | |
966 | ||
0220c518 | 967 | switch (SWITCH_ENUM_CAST (code)) |
8489eb67 RS |
968 | { |
969 | case Sescape: | |
970 | case Scharquote: | |
971 | if (from == stop) goto lose; | |
972 | from++; | |
973 | /* treat following character as a word constituent */ | |
974 | case Sword: | |
975 | case Ssymbol: | |
976 | if (depth || !sexpflag) break; | |
977 | /* This word counts as a sexp; return at end of it. */ | |
978 | while (from < stop) | |
979 | { | |
0220c518 | 980 | switch (SWITCH_ENUM_CAST (SYNTAX (FETCH_CHAR (from)))) |
8489eb67 RS |
981 | { |
982 | case Scharquote: | |
983 | case Sescape: | |
984 | from++; | |
985 | if (from == stop) goto lose; | |
986 | break; | |
987 | case Sword: | |
988 | case Ssymbol: | |
989 | case Squote: | |
990 | break; | |
991 | default: | |
992 | goto done; | |
993 | } | |
994 | from++; | |
995 | } | |
996 | goto done; | |
997 | ||
998 | case Scomment: | |
999 | if (!parse_sexp_ignore_comments) break; | |
1000 | while (1) | |
1001 | { | |
c01f7ec0 RS |
1002 | if (from == stop) |
1003 | { | |
1004 | if (depth == 0) | |
1005 | goto done; | |
1006 | goto lose; | |
1007 | } | |
e5d4f4dc RS |
1008 | c = FETCH_CHAR (from); |
1009 | if (SYNTAX (c) == Sendcomment | |
1010 | && SYNTAX_COMMENT_STYLE (c) == comstyle) | |
1011 | /* we have encountered a comment end of the same style | |
1012 | as the comment sequence which began this comment | |
1013 | section */ | |
8489eb67 RS |
1014 | break; |
1015 | from++; | |
1016 | if (from < stop && SYNTAX_COMEND_FIRST (c) | |
e5d4f4dc RS |
1017 | && SYNTAX_COMEND_SECOND (FETCH_CHAR (from)) |
1018 | && SYNTAX_COMMENT_STYLE (c) == comstyle) | |
1019 | /* we have encountered a comment end of the same style | |
1020 | as the comment sequence which began this comment | |
1021 | section */ | |
8489eb67 RS |
1022 | { from++; break; } |
1023 | } | |
1024 | break; | |
1025 | ||
1026 | case Smath: | |
1027 | if (!sexpflag) | |
1028 | break; | |
1029 | if (from != stop && c == FETCH_CHAR (from)) | |
1030 | from++; | |
1031 | if (mathexit) | |
1032 | { | |
1033 | mathexit = 0; | |
1034 | goto close1; | |
1035 | } | |
1036 | mathexit = 1; | |
1037 | ||
1038 | case Sopen: | |
1039 | if (!++depth) goto done; | |
1040 | break; | |
1041 | ||
1042 | case Sclose: | |
1043 | close1: | |
1044 | if (!--depth) goto done; | |
1045 | if (depth < min_depth) | |
1046 | error ("Containing expression ends prematurely"); | |
1047 | break; | |
1048 | ||
1049 | case Sstring: | |
1050 | stringterm = FETCH_CHAR (from - 1); | |
1051 | while (1) | |
1052 | { | |
1053 | if (from >= stop) goto lose; | |
1054 | if (FETCH_CHAR (from) == stringterm) break; | |
0220c518 | 1055 | switch (SWITCH_ENUM_CAST (SYNTAX (FETCH_CHAR (from)))) |
8489eb67 RS |
1056 | { |
1057 | case Scharquote: | |
1058 | case Sescape: | |
1059 | from++; | |
1060 | } | |
1061 | from++; | |
1062 | } | |
1063 | from++; | |
1064 | if (!depth && sexpflag) goto done; | |
1065 | break; | |
1066 | } | |
1067 | } | |
1068 | ||
1069 | /* Reached end of buffer. Error if within object, return nil if between */ | |
1070 | if (depth) goto lose; | |
1071 | ||
1072 | immediate_quit = 0; | |
1073 | return Qnil; | |
1074 | ||
1075 | /* End of object reached */ | |
1076 | done: | |
1077 | count--; | |
1078 | } | |
1079 | ||
1080 | while (count < 0) | |
1081 | { | |
1082 | stop = BEGV; | |
1083 | while (from > stop) | |
1084 | { | |
1085 | from--; | |
1086 | if (quoted = char_quoted (from)) | |
1087 | from--; | |
1088 | c = FETCH_CHAR (from); | |
1089 | code = SYNTAX (c); | |
7fc8191e RS |
1090 | comstyle = 0; |
1091 | if (code == Sendcomment) | |
1092 | comstyle = SYNTAX_COMMENT_STYLE (c); | |
8489eb67 RS |
1093 | if (from > stop && SYNTAX_COMEND_SECOND (c) |
1094 | && SYNTAX_COMEND_FIRST (FETCH_CHAR (from - 1)) | |
1095 | && !char_quoted (from - 1) | |
1096 | && parse_sexp_ignore_comments) | |
e5d4f4dc RS |
1097 | { |
1098 | /* we must record the comment style encountered so that | |
1099 | later, we can match only the proper comment begin | |
1100 | sequence of the same style */ | |
1101 | code = Sendcomment; | |
1102 | comstyle = SYNTAX_COMMENT_STYLE (FETCH_CHAR (from - 1)); | |
1103 | from--; | |
1104 | } | |
1105 | ||
8489eb67 RS |
1106 | if (SYNTAX_PREFIX (c)) |
1107 | continue; | |
1108 | ||
0220c518 | 1109 | switch (SWITCH_ENUM_CAST (quoted ? Sword : code)) |
8489eb67 RS |
1110 | { |
1111 | case Sword: | |
1112 | case Ssymbol: | |
1113 | if (depth || !sexpflag) break; | |
1114 | /* This word counts as a sexp; count object finished after passing it. */ | |
1115 | while (from > stop) | |
1116 | { | |
1117 | quoted = char_quoted (from - 1); | |
1118 | if (quoted) | |
1119 | from--; | |
e5d4f4dc RS |
1120 | if (! (quoted || SYNTAX (FETCH_CHAR (from - 1)) == Sword |
1121 | || SYNTAX (FETCH_CHAR (from - 1)) == Ssymbol | |
1122 | || SYNTAX (FETCH_CHAR (from - 1)) == Squote)) | |
8489eb67 RS |
1123 | goto done2; |
1124 | from--; | |
1125 | } | |
1126 | goto done2; | |
1127 | ||
1128 | case Smath: | |
1129 | if (!sexpflag) | |
1130 | break; | |
1131 | if (from != stop && c == FETCH_CHAR (from - 1)) | |
1132 | from--; | |
1133 | if (mathexit) | |
1134 | { | |
1135 | mathexit = 0; | |
1136 | goto open2; | |
1137 | } | |
1138 | mathexit = 1; | |
1139 | ||
1140 | case Sclose: | |
1141 | if (!++depth) goto done2; | |
1142 | break; | |
1143 | ||
1144 | case Sopen: | |
1145 | open2: | |
1146 | if (!--depth) goto done2; | |
1147 | if (depth < min_depth) | |
1148 | error ("Containing expression ends prematurely"); | |
1149 | break; | |
1150 | ||
1151 | case Sendcomment: | |
1152 | if (!parse_sexp_ignore_comments) | |
1153 | break; | |
8f9dc2ed | 1154 | #if 0 |
37bef230 RS |
1155 | if (code != SYNTAX (c)) |
1156 | /* For a two-char comment ender, we can assume | |
1157 | it does end a comment. So scan back in a simple way. */ | |
1158 | { | |
1159 | if (from != stop) from--; | |
1160 | while (1) | |
1161 | { | |
1162 | if (SYNTAX (c = FETCH_CHAR (from)) == Scomment | |
1163 | && SYNTAX_COMMENT_STYLE (c) == comstyle) | |
1164 | break; | |
c01f7ec0 RS |
1165 | if (from == stop) |
1166 | { | |
1167 | if (depth == 0) | |
1168 | goto done2; | |
1169 | goto lose; | |
1170 | } | |
37bef230 RS |
1171 | from--; |
1172 | if (SYNTAX_COMSTART_SECOND (c) | |
1173 | && SYNTAX_COMSTART_FIRST (FETCH_CHAR (from)) | |
1174 | && SYNTAX_COMMENT_STYLE (c) == comstyle | |
1175 | && !char_quoted (from)) | |
1176 | break; | |
1177 | } | |
1178 | break; | |
1179 | } | |
8f9dc2ed | 1180 | #endif /* 0 */ |
37bef230 | 1181 | |
8489eb67 RS |
1182 | /* Look back, counting the parity of string-quotes, |
1183 | and recording the comment-starters seen. | |
1184 | When we reach a safe place, assume that's not in a string; | |
1185 | then step the main scan to the earliest comment-starter seen | |
1186 | an even number of string quotes away from the safe place. | |
1187 | ||
1188 | OFROM[I] is position of the earliest comment-starter seen | |
1189 | which is I+2X quotes from the comment-end. | |
1190 | PARITY is current parity of quotes from the comment end. */ | |
1191 | { | |
8489eb67 | 1192 | int parity = 0; |
e5d4f4dc RS |
1193 | char my_stringend = 0; |
1194 | int string_lossage = 0; | |
1195 | int comment_end = from; | |
37bef230 RS |
1196 | int comstart_pos = 0; |
1197 | int comstart_parity = 0; | |
4841063f | 1198 | int scanstart = from - 1; |
8489eb67 RS |
1199 | |
1200 | /* At beginning of range to scan, we're outside of strings; | |
1201 | that determines quote parity to the comment-end. */ | |
1202 | while (from != stop) | |
1203 | { | |
1204 | /* Move back and examine a character. */ | |
1205 | from--; | |
1206 | ||
1207 | c = FETCH_CHAR (from); | |
1208 | code = SYNTAX (c); | |
1209 | ||
1210 | /* If this char is the second of a 2-char comment sequence, | |
1211 | back up and give the pair the appropriate syntax. */ | |
1212 | if (from > stop && SYNTAX_COMEND_SECOND (c) | |
1213 | && SYNTAX_COMEND_FIRST (FETCH_CHAR (from - 1))) | |
e5d4f4dc RS |
1214 | { |
1215 | code = Sendcomment; | |
1216 | from--; | |
4841063f | 1217 | c = FETCH_CHAR (from); |
e5d4f4dc RS |
1218 | } |
1219 | ||
4841063f RS |
1220 | /* If this char starts a 2-char comment start sequence, |
1221 | treat it like a 1-char comment starter. */ | |
1222 | if (from < scanstart && SYNTAX_COMSTART_FIRST (c) | |
1223 | && SYNTAX_COMSTART_SECOND (FETCH_CHAR (from + 1)) | |
1224 | && comstyle == SYNTAX_COMMENT_STYLE (FETCH_CHAR (from + 1))) | |
1225 | code = Scomment; | |
8489eb67 RS |
1226 | |
1227 | /* Ignore escaped characters. */ | |
1228 | if (char_quoted (from)) | |
1229 | continue; | |
1230 | ||
37bef230 | 1231 | /* Track parity of quotes. */ |
8489eb67 | 1232 | if (code == Sstring) |
e5d4f4dc RS |
1233 | { |
1234 | parity ^= 1; | |
1235 | if (my_stringend == 0) | |
1236 | my_stringend = c; | |
37bef230 | 1237 | /* If we have two kinds of string delimiters. |
e5d4f4dc RS |
1238 | There's no way to grok this scanning backwards. */ |
1239 | else if (my_stringend != c) | |
1240 | string_lossage = 1; | |
1241 | } | |
8489eb67 RS |
1242 | |
1243 | /* Record comment-starters according to that | |
1244 | quote-parity to the comment-end. */ | |
1245 | if (code == Scomment) | |
37bef230 RS |
1246 | { |
1247 | comstart_parity = parity; | |
1248 | comstart_pos = from; | |
1249 | } | |
8489eb67 | 1250 | |
37bef230 | 1251 | /* If we find another earlier comment-ender, |
eb8c3be9 | 1252 | any comment-starts earlier than that don't count |
37bef230 | 1253 | (because they go with the earlier comment-ender). */ |
e5d4f4dc RS |
1254 | if (code == Sendcomment |
1255 | && SYNTAX_COMMENT_STYLE (FETCH_CHAR (from)) == comstyle) | |
8489eb67 | 1256 | break; |
37bef230 RS |
1257 | |
1258 | /* Assume a defun-start point is outside of strings. */ | |
1259 | if (code == Sopen | |
1260 | && (from == stop || FETCH_CHAR (from - 1) == '\n')) | |
1261 | break; | |
8489eb67 | 1262 | } |
37bef230 RS |
1263 | |
1264 | if (comstart_pos == 0) | |
1265 | from = comment_end; | |
1266 | /* If the earliest comment starter | |
1267 | is followed by uniform paired string quotes or none, | |
1268 | we know it can't be inside a string | |
1269 | since if it were then the comment ender would be inside one. | |
1270 | So it does start a comment. Skip back to it. */ | |
1271 | else if (comstart_parity == 0 && !string_lossage) | |
1272 | from = comstart_pos; | |
1273 | else | |
e5d4f4dc RS |
1274 | { |
1275 | /* We had two kinds of string delimiters mixed up | |
1276 | together. Decode this going forwards. | |
1277 | Scan fwd from the previous comment ender | |
1278 | to the one in question; this records where we | |
1279 | last passed a comment starter. */ | |
1280 | struct lisp_parse_state state; | |
37bef230 | 1281 | scan_sexps_forward (&state, find_defun_start (comment_end), |
340f92b5 | 1282 | comment_end - 1, -10000, 0, Qnil, 0); |
e5d4f4dc RS |
1283 | if (state.incomment) |
1284 | from = state.comstart; | |
1285 | else | |
1286 | /* We can't grok this as a comment; scan it normally. */ | |
1287 | from = comment_end; | |
1288 | } | |
8489eb67 RS |
1289 | } |
1290 | break; | |
1291 | ||
1292 | case Sstring: | |
1293 | stringterm = FETCH_CHAR (from); | |
1294 | while (1) | |
1295 | { | |
1296 | if (from == stop) goto lose; | |
1297 | if (!char_quoted (from - 1) | |
1298 | && stringterm == FETCH_CHAR (from - 1)) | |
1299 | break; | |
1300 | from--; | |
1301 | } | |
1302 | from--; | |
1303 | if (!depth && sexpflag) goto done2; | |
1304 | break; | |
1305 | } | |
1306 | } | |
1307 | ||
1308 | /* Reached start of buffer. Error if within object, return nil if between */ | |
1309 | if (depth) goto lose; | |
1310 | ||
1311 | immediate_quit = 0; | |
1312 | return Qnil; | |
1313 | ||
1314 | done2: | |
1315 | count++; | |
1316 | } | |
1317 | ||
1318 | ||
1319 | immediate_quit = 0; | |
1e142fb7 | 1320 | XSETFASTINT (val, from); |
8489eb67 RS |
1321 | return val; |
1322 | ||
1323 | lose: | |
1324 | error ("Unbalanced parentheses"); | |
1325 | /* NOTREACHED */ | |
1326 | } | |
1327 | ||
340f92b5 | 1328 | static int |
8489eb67 RS |
1329 | char_quoted (pos) |
1330 | register int pos; | |
1331 | { | |
1332 | register enum syntaxcode code; | |
1333 | register int beg = BEGV; | |
1334 | register int quoted = 0; | |
1335 | ||
1336 | while (pos > beg | |
1337 | && ((code = SYNTAX (FETCH_CHAR (pos - 1))) == Scharquote | |
1338 | || code == Sescape)) | |
1339 | pos--, quoted = !quoted; | |
1340 | return quoted; | |
1341 | } | |
1342 | ||
1343 | DEFUN ("scan-lists", Fscan_lists, Sscan_lists, 3, 3, 0, | |
1344 | "Scan from character number FROM by COUNT lists.\n\ | |
1345 | Returns the character number of the position thus found.\n\ | |
1346 | \n\ | |
1347 | If DEPTH is nonzero, paren depth begins counting from that value,\n\ | |
1348 | only places where the depth in parentheses becomes zero\n\ | |
1349 | are candidates for stopping; COUNT such places are counted.\n\ | |
1350 | Thus, a positive value for DEPTH means go out levels.\n\ | |
1351 | \n\ | |
1352 | Comments are ignored if `parse-sexp-ignore-comments' is non-nil.\n\ | |
1353 | \n\ | |
1354 | If the beginning or end of (the accessible part of) the buffer is reached\n\ | |
1355 | and the depth is wrong, an error is signaled.\n\ | |
1356 | If the depth is right but the count is not used up, nil is returned.") | |
1357 | (from, count, depth) | |
1358 | Lisp_Object from, count, depth; | |
1359 | { | |
1360 | CHECK_NUMBER (from, 0); | |
1361 | CHECK_NUMBER (count, 1); | |
1362 | CHECK_NUMBER (depth, 2); | |
1363 | ||
1364 | return scan_lists (XINT (from), XINT (count), XINT (depth), 0); | |
1365 | } | |
1366 | ||
1367 | DEFUN ("scan-sexps", Fscan_sexps, Sscan_sexps, 2, 2, 0, | |
1368 | "Scan from character number FROM by COUNT balanced expressions.\n\ | |
1369 | If COUNT is negative, scan backwards.\n\ | |
1370 | Returns the character number of the position thus found.\n\ | |
1371 | \n\ | |
1372 | Comments are ignored if `parse-sexp-ignore-comments' is non-nil.\n\ | |
1373 | \n\ | |
1374 | If the beginning or end of (the accessible part of) the buffer is reached\n\ | |
1375 | in the middle of a parenthetical grouping, an error is signaled.\n\ | |
1376 | If the beginning or end is reached between groupings\n\ | |
1377 | but before count is used up, nil is returned.") | |
1378 | (from, count) | |
1379 | Lisp_Object from, count; | |
1380 | { | |
1381 | CHECK_NUMBER (from, 0); | |
1382 | CHECK_NUMBER (count, 1); | |
1383 | ||
1384 | return scan_lists (XINT (from), XINT (count), 0, 1); | |
1385 | } | |
1386 | ||
1387 | DEFUN ("backward-prefix-chars", Fbackward_prefix_chars, Sbackward_prefix_chars, | |
1388 | 0, 0, 0, | |
1389 | "Move point backward over any number of chars with prefix syntax.\n\ | |
1390 | This includes chars with \"quote\" or \"prefix\" syntax (' or p).") | |
1391 | () | |
1392 | { | |
1393 | int beg = BEGV; | |
1394 | int pos = point; | |
1395 | ||
1396 | while (pos > beg && !char_quoted (pos - 1) | |
1397 | && (SYNTAX (FETCH_CHAR (pos - 1)) == Squote | |
1398 | || SYNTAX_PREFIX (FETCH_CHAR (pos - 1)))) | |
1399 | pos--; | |
1400 | ||
1401 | SET_PT (pos); | |
1402 | ||
1403 | return Qnil; | |
1404 | } | |
1405 | \f | |
8489eb67 | 1406 | /* Parse forward from FROM to END, |
e5d4f4dc RS |
1407 | assuming that FROM has state OLDSTATE (nil means FROM is start of function), |
1408 | and return a description of the state of the parse at END. | |
c81a3712 RS |
1409 | If STOPBEFORE is nonzero, stop at the start of an atom. |
1410 | If COMMENTSTOP is nonzero, stop at the start of a comment. */ | |
8489eb67 | 1411 | |
340f92b5 | 1412 | static void |
c81a3712 RS |
1413 | scan_sexps_forward (stateptr, from, end, targetdepth, |
1414 | stopbefore, oldstate, commentstop) | |
e5d4f4dc | 1415 | struct lisp_parse_state *stateptr; |
8489eb67 RS |
1416 | register int from; |
1417 | int end, targetdepth, stopbefore; | |
1418 | Lisp_Object oldstate; | |
c81a3712 | 1419 | int commentstop; |
8489eb67 RS |
1420 | { |
1421 | struct lisp_parse_state state; | |
1422 | ||
1423 | register enum syntaxcode code; | |
1424 | struct level { int last, prev; }; | |
1425 | struct level levelstart[100]; | |
1426 | register struct level *curlevel = levelstart; | |
1427 | struct level *endlevel = levelstart + 100; | |
1428 | char prev; | |
1429 | register int depth; /* Paren depth of current scanning location. | |
1430 | level - levelstart equals this except | |
1431 | when the depth becomes negative. */ | |
1432 | int mindepth; /* Lowest DEPTH value seen. */ | |
1433 | int start_quoted = 0; /* Nonzero means starting after a char quote */ | |
1434 | Lisp_Object tem; | |
1435 | ||
1436 | immediate_quit = 1; | |
1437 | QUIT; | |
1438 | ||
265a9e55 | 1439 | if (NILP (oldstate)) |
8489eb67 RS |
1440 | { |
1441 | depth = 0; | |
1442 | state.instring = -1; | |
1443 | state.incomment = 0; | |
e5d4f4dc | 1444 | state.comstyle = 0; /* comment style a by default */ |
8489eb67 RS |
1445 | } |
1446 | else | |
1447 | { | |
1448 | tem = Fcar (oldstate); | |
265a9e55 | 1449 | if (!NILP (tem)) |
8489eb67 RS |
1450 | depth = XINT (tem); |
1451 | else | |
1452 | depth = 0; | |
1453 | ||
1454 | oldstate = Fcdr (oldstate); | |
1455 | oldstate = Fcdr (oldstate); | |
1456 | oldstate = Fcdr (oldstate); | |
1457 | tem = Fcar (oldstate); | |
265a9e55 | 1458 | state.instring = !NILP (tem) ? XINT (tem) : -1; |
8489eb67 RS |
1459 | |
1460 | oldstate = Fcdr (oldstate); | |
1461 | tem = Fcar (oldstate); | |
265a9e55 | 1462 | state.incomment = !NILP (tem); |
8489eb67 RS |
1463 | |
1464 | oldstate = Fcdr (oldstate); | |
1465 | tem = Fcar (oldstate); | |
265a9e55 | 1466 | start_quoted = !NILP (tem); |
e5d4f4dc RS |
1467 | |
1468 | /* if the eight element of the list is nil, we are in comment | |
1469 | style a. if it is non-nil, we are in comment style b */ | |
1470 | oldstate = Fcdr (oldstate); | |
1471 | oldstate = Fcdr (oldstate); | |
e5d4f4dc RS |
1472 | tem = Fcar (oldstate); |
1473 | state.comstyle = !NILP (tem); | |
8489eb67 RS |
1474 | } |
1475 | state.quoted = 0; | |
1476 | mindepth = depth; | |
1477 | ||
1478 | curlevel->prev = -1; | |
1479 | curlevel->last = -1; | |
1480 | ||
1481 | /* Enter the loop at a place appropriate for initial state. */ | |
1482 | ||
1483 | if (state.incomment) goto startincomment; | |
1484 | if (state.instring >= 0) | |
1485 | { | |
1486 | if (start_quoted) goto startquotedinstring; | |
1487 | goto startinstring; | |
1488 | } | |
1489 | if (start_quoted) goto startquoted; | |
1490 | ||
1491 | while (from < end) | |
1492 | { | |
e5d4f4dc | 1493 | code = SYNTAX (FETCH_CHAR (from)); |
8489eb67 | 1494 | from++; |
8f9dc2ed RS |
1495 | if (code == Scomment) |
1496 | state.comstart = from-1; | |
1497 | ||
1498 | else if (from < end && SYNTAX_COMSTART_FIRST (FETCH_CHAR (from - 1)) | |
1499 | && SYNTAX_COMSTART_SECOND (FETCH_CHAR (from))) | |
e5d4f4dc RS |
1500 | { |
1501 | /* Record the comment style we have entered so that only | |
1502 | the comment-end sequence of the same style actually | |
1503 | terminates the comment section. */ | |
1504 | code = Scomment; | |
1505 | state.comstyle = SYNTAX_COMMENT_STYLE (FETCH_CHAR (from)); | |
8f9dc2ed | 1506 | state.comstart = from-1; |
e5d4f4dc RS |
1507 | from++; |
1508 | } | |
1509 | ||
8489eb67 RS |
1510 | if (SYNTAX_PREFIX (FETCH_CHAR (from - 1))) |
1511 | continue; | |
0220c518 | 1512 | switch (SWITCH_ENUM_CAST (code)) |
8489eb67 RS |
1513 | { |
1514 | case Sescape: | |
1515 | case Scharquote: | |
1516 | if (stopbefore) goto stop; /* this arg means stop at sexp start */ | |
1517 | curlevel->last = from - 1; | |
1518 | startquoted: | |
1519 | if (from == end) goto endquoted; | |
1520 | from++; | |
1521 | goto symstarted; | |
1522 | /* treat following character as a word constituent */ | |
1523 | case Sword: | |
1524 | case Ssymbol: | |
1525 | if (stopbefore) goto stop; /* this arg means stop at sexp start */ | |
1526 | curlevel->last = from - 1; | |
1527 | symstarted: | |
1528 | while (from < end) | |
1529 | { | |
0220c518 | 1530 | switch (SWITCH_ENUM_CAST (SYNTAX (FETCH_CHAR (from)))) |
8489eb67 RS |
1531 | { |
1532 | case Scharquote: | |
1533 | case Sescape: | |
1534 | from++; | |
1535 | if (from == end) goto endquoted; | |
1536 | break; | |
1537 | case Sword: | |
1538 | case Ssymbol: | |
1539 | case Squote: | |
1540 | break; | |
1541 | default: | |
1542 | goto symdone; | |
1543 | } | |
1544 | from++; | |
1545 | } | |
1546 | symdone: | |
1547 | curlevel->prev = curlevel->last; | |
1548 | break; | |
1549 | ||
5a28e48c RS |
1550 | startincomment: |
1551 | if (commentstop) | |
1552 | goto done; | |
1553 | if (from != BEGV) | |
1554 | { | |
1555 | /* Enter the loop in the middle so that we find | |
1556 | a 2-char comment ender if we start in the middle of it. */ | |
1557 | prev = FETCH_CHAR (from - 1); | |
1558 | goto startincomment_1; | |
1559 | } | |
1560 | /* At beginning of buffer, enter the loop the ordinary way. */ | |
1561 | ||
8489eb67 RS |
1562 | case Scomment: |
1563 | state.incomment = 1; | |
c81a3712 RS |
1564 | if (commentstop) |
1565 | goto done; | |
8489eb67 RS |
1566 | while (1) |
1567 | { | |
1568 | if (from == end) goto done; | |
e5d4f4dc RS |
1569 | prev = FETCH_CHAR (from); |
1570 | if (SYNTAX (prev) == Sendcomment | |
1571 | && SYNTAX_COMMENT_STYLE (prev) == state.comstyle) | |
1572 | /* Only terminate the comment section if the endcomment | |
1573 | of the same style as the start sequence has been | |
1574 | encountered. */ | |
8489eb67 RS |
1575 | break; |
1576 | from++; | |
5a28e48c | 1577 | startincomment_1: |
8489eb67 | 1578 | if (from < end && SYNTAX_COMEND_FIRST (prev) |
e5d4f4dc RS |
1579 | && SYNTAX_COMEND_SECOND (FETCH_CHAR (from)) |
1580 | && SYNTAX_COMMENT_STYLE (prev) == state.comstyle) | |
1581 | /* Only terminate the comment section if the end-comment | |
1582 | sequence of the same style as the start sequence has | |
1583 | been encountered. */ | |
8489eb67 RS |
1584 | { from++; break; } |
1585 | } | |
1586 | state.incomment = 0; | |
e5d4f4dc | 1587 | state.comstyle = 0; /* reset the comment style */ |
8489eb67 RS |
1588 | break; |
1589 | ||
1590 | case Sopen: | |
1591 | if (stopbefore) goto stop; /* this arg means stop at sexp start */ | |
1592 | depth++; | |
1593 | /* curlevel++->last ran into compiler bug on Apollo */ | |
1594 | curlevel->last = from - 1; | |
1595 | if (++curlevel == endlevel) | |
1596 | error ("Nesting too deep for parser"); | |
1597 | curlevel->prev = -1; | |
1598 | curlevel->last = -1; | |
30844415 | 1599 | if (targetdepth == depth) goto done; |
8489eb67 RS |
1600 | break; |
1601 | ||
1602 | case Sclose: | |
1603 | depth--; | |
1604 | if (depth < mindepth) | |
1605 | mindepth = depth; | |
1606 | if (curlevel != levelstart) | |
1607 | curlevel--; | |
1608 | curlevel->prev = curlevel->last; | |
30844415 | 1609 | if (targetdepth == depth) goto done; |
8489eb67 RS |
1610 | break; |
1611 | ||
1612 | case Sstring: | |
1613 | if (stopbefore) goto stop; /* this arg means stop at sexp start */ | |
1614 | curlevel->last = from - 1; | |
1615 | state.instring = FETCH_CHAR (from - 1); | |
1616 | startinstring: | |
1617 | while (1) | |
1618 | { | |
1619 | if (from >= end) goto done; | |
1620 | if (FETCH_CHAR (from) == state.instring) break; | |
0220c518 | 1621 | switch (SWITCH_ENUM_CAST (SYNTAX (FETCH_CHAR (from)))) |
8489eb67 RS |
1622 | { |
1623 | case Scharquote: | |
1624 | case Sescape: | |
1625 | from++; | |
1626 | startquotedinstring: | |
1627 | if (from >= end) goto endquoted; | |
1628 | } | |
1629 | from++; | |
1630 | } | |
1631 | state.instring = -1; | |
1632 | curlevel->prev = curlevel->last; | |
1633 | from++; | |
1634 | break; | |
1635 | ||
1636 | case Smath: | |
1637 | break; | |
1638 | } | |
1639 | } | |
1640 | goto done; | |
1641 | ||
1642 | stop: /* Here if stopping before start of sexp. */ | |
1643 | from--; /* We have just fetched the char that starts it; */ | |
1644 | goto done; /* but return the position before it. */ | |
1645 | ||
1646 | endquoted: | |
1647 | state.quoted = 1; | |
1648 | done: | |
1649 | state.depth = depth; | |
1650 | state.mindepth = mindepth; | |
1651 | state.thislevelstart = curlevel->prev; | |
1652 | state.prevlevelstart | |
1653 | = (curlevel == levelstart) ? -1 : (curlevel - 1)->last; | |
1654 | state.location = from; | |
1655 | immediate_quit = 0; | |
1656 | ||
e5d4f4dc | 1657 | *stateptr = state; |
8489eb67 RS |
1658 | } |
1659 | ||
1660 | /* This comment supplies the doc string for parse-partial-sexp, | |
1661 | for make-docfile to see. We cannot put this in the real DEFUN | |
1662 | due to limits in the Unix cpp. | |
1663 | ||
c81a3712 | 1664 | DEFUN ("parse-partial-sexp", Ffoo, Sfoo, 2, 6, 0, |
8489eb67 RS |
1665 | "Parse Lisp syntax starting at FROM until TO; return status of parse at TO.\n\ |
1666 | Parsing stops at TO or when certain criteria are met;\n\ | |
1667 | point is set to where parsing stops.\n\ | |
1668 | If fifth arg STATE is omitted or nil,\n\ | |
1669 | parsing assumes that FROM is the beginning of a function.\n\ | |
e5d4f4dc | 1670 | Value is a list of eight elements describing final state of parsing:\n\ |
af50f9e5 RS |
1671 | 0. depth in parens.\n\ |
1672 | 1. character address of start of innermost containing list; nil if none.\n\ | |
1673 | 2. character address of start of last complete sexp terminated.\n\ | |
1674 | 3. non-nil if inside a string.\n\ | |
8489eb67 | 1675 | (it is the character that will terminate the string.)\n\ |
af50f9e5 RS |
1676 | 4. t if inside a comment.\n\ |
1677 | 5. t if following a quote character.\n\ | |
1678 | 6. the minimum paren-depth encountered during this scan.\n\ | |
1679 | 7. t if in a comment of style `b'.\n\ | |
8489eb67 RS |
1680 | If third arg TARGETDEPTH is non-nil, parsing stops if the depth\n\ |
1681 | in parentheses becomes equal to TARGETDEPTH.\n\ | |
1682 | Fourth arg STOPBEFORE non-nil means stop when come to\n\ | |
1683 | any character that starts a sexp.\n\ | |
ec11639d | 1684 | Fifth arg STATE is an eight-list like what this function returns.\n\ |
a4275ad1 | 1685 | It is used to initialize the state of the parse. Its second and third |
c81a3712 RS |
1686 | elements are ignored. |
1687 | Sixth args COMMENTSTOP non-nil means stop at the start of a comment.") | |
1688 | (from, to, targetdepth, stopbefore, state, commentstop) | |
8489eb67 RS |
1689 | */ |
1690 | ||
c81a3712 | 1691 | DEFUN ("parse-partial-sexp", Fparse_partial_sexp, Sparse_partial_sexp, 2, 6, 0, |
8489eb67 | 1692 | 0 /* See immediately above */) |
c81a3712 RS |
1693 | (from, to, targetdepth, stopbefore, oldstate, commentstop) |
1694 | Lisp_Object from, to, targetdepth, stopbefore, oldstate, commentstop; | |
8489eb67 RS |
1695 | { |
1696 | struct lisp_parse_state state; | |
1697 | int target; | |
1698 | ||
265a9e55 | 1699 | if (!NILP (targetdepth)) |
8489eb67 RS |
1700 | { |
1701 | CHECK_NUMBER (targetdepth, 3); | |
1702 | target = XINT (targetdepth); | |
1703 | } | |
1704 | else | |
1705 | target = -100000; /* We won't reach this depth */ | |
1706 | ||
1707 | validate_region (&from, &to); | |
e5d4f4dc | 1708 | scan_sexps_forward (&state, XINT (from), XINT (to), |
c81a3712 RS |
1709 | target, !NILP (stopbefore), oldstate, |
1710 | !NILP (commentstop)); | |
8489eb67 RS |
1711 | |
1712 | SET_PT (state.location); | |
1713 | ||
1714 | return Fcons (make_number (state.depth), | |
1715 | Fcons (state.prevlevelstart < 0 ? Qnil : make_number (state.prevlevelstart), | |
1716 | Fcons (state.thislevelstart < 0 ? Qnil : make_number (state.thislevelstart), | |
1717 | Fcons (state.instring >= 0 ? make_number (state.instring) : Qnil, | |
1718 | Fcons (state.incomment ? Qt : Qnil, | |
1719 | Fcons (state.quoted ? Qt : Qnil, | |
e5d4f4dc RS |
1720 | Fcons (make_number (state.mindepth), |
1721 | Fcons (state.comstyle ? Qt : Qnil, | |
1722 | Qnil)))))))); | |
8489eb67 RS |
1723 | } |
1724 | \f | |
1725 | init_syntax_once () | |
1726 | { | |
1727 | register int i; | |
8ea151b2 | 1728 | Lisp_Object temp; |
8489eb67 | 1729 | |
5ebaddf5 RS |
1730 | /* This has to be done here, before we call Fmake_char_table. */ |
1731 | Qsyntax_table = intern ("syntax-table"); | |
1732 | staticpro (&Qsyntax_table); | |
1733 | ||
1734 | /* Intern this now in case it isn't already done. | |
1735 | Setting this variable twice is harmless. | |
1736 | But don't staticpro it here--that is done in alloc.c. */ | |
1737 | Qchar_table_extra_slots = intern ("char-table-extra-slots"); | |
1738 | ||
1739 | /* Now we are ready to set up this property, so we can | |
1740 | create syntax tables. */ | |
1741 | Fput (Qsyntax_table, Qchar_table_extra_slots, make_number (0)); | |
1742 | ||
8ea151b2 | 1743 | temp = Fcons (make_number ((int) Swhitespace), Qnil); |
8489eb67 | 1744 | |
5ebaddf5 | 1745 | Vstandard_syntax_table = Fmake_char_table (Qsyntax_table, temp); |
8489eb67 | 1746 | |
8ea151b2 | 1747 | temp = Fcons (make_number ((int) Sword), Qnil); |
8489eb67 | 1748 | for (i = 'a'; i <= 'z'; i++) |
8ea151b2 | 1749 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, i, temp); |
8489eb67 | 1750 | for (i = 'A'; i <= 'Z'; i++) |
8ea151b2 | 1751 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, i, temp); |
8489eb67 | 1752 | for (i = '0'; i <= '9'; i++) |
8ea151b2 RS |
1753 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, i, temp); |
1754 | ||
1755 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '$', temp); | |
1756 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '%', temp); | |
1757 | ||
1758 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '(', | |
1759 | Fcons (make_number (Sopen), make_number (')'))); | |
1760 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, ')', | |
1761 | Fcons (make_number (Sclose), make_number ('('))); | |
1762 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '[', | |
1763 | Fcons (make_number (Sopen), make_number (']'))); | |
1764 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, ']', | |
1765 | Fcons (make_number (Sclose), make_number ('['))); | |
1766 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '{', | |
1767 | Fcons (make_number (Sopen), make_number ('}'))); | |
1768 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '}', | |
1769 | Fcons (make_number (Sclose), make_number ('{'))); | |
1770 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '"', | |
1771 | Fcons (make_number ((int) Sstring), Qnil)); | |
1772 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '\\', | |
1773 | Fcons (make_number ((int) Sescape), Qnil)); | |
1774 | ||
1775 | temp = Fcons (make_number ((int) Ssymbol), Qnil); | |
8489eb67 | 1776 | for (i = 0; i < 10; i++) |
8ea151b2 | 1777 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, "_-+*/&|<>="[i], temp); |
8489eb67 | 1778 | |
8ea151b2 | 1779 | temp = Fcons (make_number ((int) Spunct), Qnil); |
8489eb67 | 1780 | for (i = 0; i < 12; i++) |
8ea151b2 | 1781 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, ".,;:?!#@~^'`"[i], temp); |
8489eb67 RS |
1782 | } |
1783 | ||
1784 | syms_of_syntax () | |
1785 | { | |
1786 | Qsyntax_table_p = intern ("syntax-table-p"); | |
1787 | staticpro (&Qsyntax_table_p); | |
1788 | ||
1789 | DEFVAR_BOOL ("parse-sexp-ignore-comments", &parse_sexp_ignore_comments, | |
1790 | "Non-nil means `forward-sexp', etc., should treat comments as whitespace."); | |
1791 | ||
1792 | words_include_escapes = 0; | |
1793 | DEFVAR_BOOL ("words-include-escapes", &words_include_escapes, | |
1794 | "Non-nil means `forward-word', etc., should treat escape chars part of words."); | |
1795 | ||
1796 | defsubr (&Ssyntax_table_p); | |
1797 | defsubr (&Ssyntax_table); | |
1798 | defsubr (&Sstandard_syntax_table); | |
1799 | defsubr (&Scopy_syntax_table); | |
1800 | defsubr (&Sset_syntax_table); | |
1801 | defsubr (&Schar_syntax); | |
beefa22e | 1802 | defsubr (&Smatching_paren); |
8489eb67 RS |
1803 | defsubr (&Smodify_syntax_entry); |
1804 | defsubr (&Sdescribe_syntax); | |
1805 | ||
1806 | defsubr (&Sforward_word); | |
1807 | ||
b3cfe0c8 | 1808 | defsubr (&Sforward_comment); |
8489eb67 RS |
1809 | defsubr (&Sscan_lists); |
1810 | defsubr (&Sscan_sexps); | |
1811 | defsubr (&Sbackward_prefix_chars); | |
1812 | defsubr (&Sparse_partial_sexp); | |
1813 | } |