Commit | Line | Data |
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8489eb67 | 1 | /* GNU Emacs routines to deal with syntax tables; also word and list parsing. |
acaf905b | 2 | Copyright (C) 1985, 1987, 1993-1995, 1997-1999, 2001-2012 |
429ab54e | 3 | Free Software Foundation, Inc. |
8489eb67 RS |
4 | |
5 | This file is part of GNU Emacs. | |
6 | ||
9ec0b715 | 7 | GNU Emacs is free software: you can redistribute it and/or modify |
8489eb67 | 8 | it under the terms of the GNU General Public License as published by |
9ec0b715 GM |
9 | the Free Software Foundation, either version 3 of the License, or |
10 | (at your option) any later version. | |
8489eb67 RS |
11 | |
12 | GNU Emacs is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
9ec0b715 | 18 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
8489eb67 RS |
19 | |
20 | ||
18160b98 | 21 | #include <config.h> |
1b2de274 | 22 | |
8489eb67 | 23 | #include <ctype.h> |
1b2de274 | 24 | #include <sys/types.h> |
d7306fe6 | 25 | #include <setjmp.h> |
8489eb67 RS |
26 | #include "lisp.h" |
27 | #include "commands.h" | |
5c7b02ab | 28 | #include "character.h" |
e5560ff7 | 29 | #include "buffer.h" |
e35f6ff7 | 30 | #include "keymap.h" |
a1bc88d4 | 31 | #include "regex.h" |
195d1361 RS |
32 | |
33 | /* Make syntax table lookup grant data in gl_state. */ | |
34 | #define SYNTAX_ENTRY_VIA_PROPERTY | |
35 | ||
8489eb67 | 36 | #include "syntax.h" |
195d1361 | 37 | #include "intervals.h" |
c5683ceb SM |
38 | #include "category.h" |
39 | ||
40 | /* Then there are seven single-bit flags that have the following meanings: | |
41 | 1. This character is the first of a two-character comment-start sequence. | |
42 | 2. This character is the second of a two-character comment-start sequence. | |
43 | 3. This character is the first of a two-character comment-end sequence. | |
44 | 4. This character is the second of a two-character comment-end sequence. | |
45 | 5. This character is a prefix, for backward-prefix-chars. | |
46 | 6. The char is part of a delimiter for comments of style "b". | |
47 | 7. This character is part of a nestable comment sequence. | |
48 | 8. The char is part of a delimiter for comments of style "c". | |
49 | Note that any two-character sequence whose first character has flag 1 | |
50 | and whose second character has flag 2 will be interpreted as a comment start. | |
51 | ||
52 | bit 6 and 8 are used to discriminate between different comment styles. | |
53 | Languages such as C++ allow two orthogonal syntax start/end pairs | |
54 | and bit 6 is used to determine whether a comment-end or Scommentend | |
55 | ends style a or b. Comment markers can start style a, b, c, or bc. | |
56 | Style a is always the default. | |
57 | For 2-char comment markers, the style b flag is only looked up on the second | |
58 | char of the comment marker and on the first char of the comment ender. | |
59 | For style c (like to for the nested flag), the flag can be placed on any | |
60 | one of the chars. | |
61 | */ | |
62 | ||
63 | /* These macros extract specific flags from an integer | |
64 | that holds the syntax code and the flags. */ | |
65 | ||
66 | #define SYNTAX_FLAGS_COMSTART_FIRST(flags) (((flags) >> 16) & 1) | |
67 | ||
68 | #define SYNTAX_FLAGS_COMSTART_SECOND(flags) (((flags) >> 17) & 1) | |
69 | ||
70 | #define SYNTAX_FLAGS_COMEND_FIRST(flags) (((flags) >> 18) & 1) | |
71 | ||
72 | #define SYNTAX_FLAGS_COMEND_SECOND(flags) (((flags) >> 19) & 1) | |
73 | ||
74 | #define SYNTAX_FLAGS_PREFIX(flags) (((flags) >> 20) & 1) | |
75 | ||
76 | #define SYNTAX_FLAGS_COMMENT_STYLEB(flags) (((flags) >> 21) & 1) | |
77 | #define SYNTAX_FLAGS_COMMENT_STYLEC(flags) (((flags) >> 22) & 2) | |
78 | /* FLAGS should be the flags of the main char of the comment marker, e.g. | |
79 | the second for comstart and the first for comend. */ | |
80 | #define SYNTAX_FLAGS_COMMENT_STYLE(flags, other_flags) \ | |
81 | (SYNTAX_FLAGS_COMMENT_STYLEB (flags) \ | |
82 | | SYNTAX_FLAGS_COMMENT_STYLEC (flags) \ | |
83 | | SYNTAX_FLAGS_COMMENT_STYLEC (other_flags)) | |
84 | ||
85 | #define SYNTAX_FLAGS_COMMENT_NESTED(flags) (((flags) >> 22) & 1) | |
86 | ||
87 | /* These macros extract a particular flag for a given character. */ | |
88 | ||
89 | #define SYNTAX_COMEND_FIRST(c) \ | |
90 | (SYNTAX_FLAGS_COMEND_FIRST (SYNTAX_WITH_FLAGS (c))) | |
91 | #define SYNTAX_PREFIX(c) (SYNTAX_FLAGS_PREFIX (SYNTAX_WITH_FLAGS (c))) | |
195d1361 RS |
92 | |
93 | /* We use these constants in place for comment-style and | |
94 | string-ender-char to distinguish comments/strings started by | |
95 | comment_fence and string_fence codes. */ | |
96 | ||
eacd378d PE |
97 | #define ST_COMMENT_STYLE (256 + 1) |
98 | #define ST_STRING_STYLE (256 + 2) | |
8489eb67 | 99 | |
955cbe7b PE |
100 | static Lisp_Object Qsyntax_table_p; |
101 | static Lisp_Object Qsyntax_table, Qscan_error; | |
8489eb67 | 102 | |
d4b43b22 | 103 | #ifndef __GNUC__ |
8ea151b2 RS |
104 | /* Used as a temporary in SYNTAX_ENTRY and other macros in syntax.h, |
105 | if not compiled with GCC. No need to mark it, since it is used | |
106 | only very temporarily. */ | |
107 | Lisp_Object syntax_temp; | |
d4b43b22 | 108 | #endif |
8ea151b2 | 109 | |
e5d4f4dc RS |
110 | /* This is the internal form of the parse state used in parse-partial-sexp. */ |
111 | ||
112 | struct lisp_parse_state | |
113 | { | |
d311d28c | 114 | EMACS_INT depth; /* Depth at end of parsing. */ |
6449674e | 115 | int instring; /* -1 if not within string, else desired terminator. */ |
d311d28c | 116 | EMACS_INT incomment; /* -1 if in unnestable comment else comment nesting */ |
6449674e SM |
117 | int comstyle; /* comment style a=0, or b=1, or ST_COMMENT_STYLE. */ |
118 | int quoted; /* Nonzero if just after an escape char at end of parsing */ | |
d311d28c | 119 | EMACS_INT mindepth; /* Minimum depth seen while scanning. */ |
6449674e | 120 | /* Char number of most recent start-of-expression at current level */ |
d311d28c | 121 | ptrdiff_t thislevelstart; |
6449674e | 122 | /* Char number of start of containing expression */ |
d311d28c PE |
123 | ptrdiff_t prevlevelstart; |
124 | ptrdiff_t location; /* Char number at which parsing stopped. */ | |
125 | ptrdiff_t comstr_start; /* Position of last comment/string starter. */ | |
6449674e SM |
126 | Lisp_Object levelstarts; /* Char numbers of starts-of-expression |
127 | of levels (starting from outermost). */ | |
e5d4f4dc RS |
128 | }; |
129 | \f | |
37bef230 RS |
130 | /* These variables are a cache for finding the start of a defun. |
131 | find_start_pos is the place for which the defun start was found. | |
132 | find_start_value is the defun start position found for it. | |
6a140a74 | 133 | find_start_value_byte is the corresponding byte position. |
37bef230 RS |
134 | find_start_buffer is the buffer it was found in. |
135 | find_start_begv is the BEGV value when it was found. | |
136 | find_start_modiff is the value of MODIFF when it was found. */ | |
137 | ||
d311d28c PE |
138 | static ptrdiff_t find_start_pos; |
139 | static ptrdiff_t find_start_value; | |
140 | static ptrdiff_t find_start_value_byte; | |
37bef230 | 141 | static struct buffer *find_start_buffer; |
d311d28c PE |
142 | static ptrdiff_t find_start_begv; |
143 | static EMACS_INT find_start_modiff; | |
6a140a74 RS |
144 | |
145 | ||
cd64ea1d | 146 | static Lisp_Object Fsyntax_table_p (Lisp_Object); |
f57e2426 J |
147 | static Lisp_Object skip_chars (int, Lisp_Object, Lisp_Object, int); |
148 | static Lisp_Object skip_syntaxes (int, Lisp_Object, Lisp_Object); | |
149 | static Lisp_Object scan_lists (EMACS_INT, EMACS_INT, EMACS_INT, int); | |
150 | static void scan_sexps_forward (struct lisp_parse_state *, | |
d311d28c | 151 | ptrdiff_t, ptrdiff_t, ptrdiff_t, EMACS_INT, |
f57e2426 J |
152 | int, Lisp_Object, int); |
153 | static int in_classes (int, Lisp_Object); | |
195d1361 | 154 | \f |
c5683ceb SM |
155 | /* Whether the syntax of the character C has the prefix flag set. */ |
156 | int syntax_prefix_flag_p (int c) | |
157 | { | |
158 | return SYNTAX_PREFIX (c); | |
159 | } | |
195d1361 RS |
160 | |
161 | struct gl_state_s gl_state; /* Global state of syntax parser. */ | |
162 | ||
195d1361 RS |
163 | #define INTERVALS_AT_ONCE 10 /* 1 + max-number of intervals |
164 | to scan to property-change. */ | |
165 | ||
6a140a74 RS |
166 | /* Update gl_state to an appropriate interval which contains CHARPOS. The |
167 | sign of COUNT give the relative position of CHARPOS wrt the previously | |
195d1361 | 168 | valid interval. If INIT, only [be]_property fields of gl_state are |
6a140a74 | 169 | valid at start, the rest is filled basing on OBJECT. |
195d1361 | 170 | |
6a140a74 | 171 | `gl_state.*_i' are the intervals, and CHARPOS is further in the search |
195d1361 RS |
172 | direction than the intervals - or in an interval. We update the |
173 | current syntax-table basing on the property of this interval, and | |
6a140a74 | 174 | update the interval to start further than CHARPOS - or be |
195d1361 | 175 | NULL_INTERVAL. We also update lim_property to be the next value of |
6a140a74 | 176 | charpos to call this subroutine again - or be before/after the |
195d1361 RS |
177 | start/end of OBJECT. */ |
178 | ||
179 | void | |
d311d28c | 180 | update_syntax_table (ptrdiff_t charpos, EMACS_INT count, int init, |
4f3a2f8d | 181 | Lisp_Object object) |
195d1361 RS |
182 | { |
183 | Lisp_Object tmp_table; | |
12cbf13f PE |
184 | unsigned cnt = 0; |
185 | int invalidate = 1; | |
5a774522 | 186 | INTERVAL i; |
195d1361 RS |
187 | |
188 | if (init) | |
189 | { | |
bb0de084 | 190 | gl_state.old_prop = Qnil; |
195d1361 RS |
191 | gl_state.start = gl_state.b_property; |
192 | gl_state.stop = gl_state.e_property; | |
bb0de084 SM |
193 | i = interval_of (charpos, object); |
194 | gl_state.backward_i = gl_state.forward_i = i; | |
195d1361 RS |
195 | invalidate = 0; |
196 | if (NULL_INTERVAL_P (i)) | |
197 | return; | |
f902a008 | 198 | /* interval_of updates only ->position of the return value, so |
d80f4cc7 | 199 | update the parents manually to speed up update_interval. */ |
bb0de084 | 200 | while (!NULL_PARENT (i)) |
d80f4cc7 RS |
201 | { |
202 | if (AM_RIGHT_CHILD (i)) | |
439d5cb4 | 203 | INTERVAL_PARENT (i)->position = i->position |
d80f4cc7 | 204 | - LEFT_TOTAL_LENGTH (i) + TOTAL_LENGTH (i) /* right end */ |
439d5cb4 KR |
205 | - TOTAL_LENGTH (INTERVAL_PARENT (i)) |
206 | + LEFT_TOTAL_LENGTH (INTERVAL_PARENT (i)); | |
d80f4cc7 | 207 | else |
439d5cb4 | 208 | INTERVAL_PARENT (i)->position = i->position - LEFT_TOTAL_LENGTH (i) |
d80f4cc7 | 209 | + TOTAL_LENGTH (i); |
439d5cb4 | 210 | i = INTERVAL_PARENT (i); |
d80f4cc7 RS |
211 | } |
212 | i = gl_state.forward_i; | |
bb0de084 | 213 | gl_state.b_property = i->position - gl_state.offset; |
ee0cdb48 | 214 | gl_state.e_property = INTERVAL_LAST_POS (i) - gl_state.offset; |
195d1361 RS |
215 | goto update; |
216 | } | |
5a774522 | 217 | i = count > 0 ? gl_state.forward_i : gl_state.backward_i; |
195d1361 | 218 | |
423e705d | 219 | /* We are guaranteed to be called with CHARPOS either in i, |
6a140a74 | 220 | or further off. */ |
195d1361 RS |
221 | if (NULL_INTERVAL_P (i)) |
222 | error ("Error in syntax_table logic for to-the-end intervals"); | |
6a140a74 | 223 | else if (charpos < i->position) /* Move left. */ |
195d1361 RS |
224 | { |
225 | if (count > 0) | |
f902a008 | 226 | error ("Error in syntax_table logic for intervals <-"); |
195d1361 | 227 | /* Update the interval. */ |
6a140a74 | 228 | i = update_interval (i, charpos); |
bb0de084 | 229 | if (INTERVAL_LAST_POS (i) != gl_state.b_property) |
195d1361 RS |
230 | { |
231 | invalidate = 0; | |
195d1361 | 232 | gl_state.forward_i = i; |
ee0cdb48 | 233 | gl_state.e_property = INTERVAL_LAST_POS (i) - gl_state.offset; |
195d1361 | 234 | } |
423e705d | 235 | } |
6a140a74 | 236 | else if (charpos >= INTERVAL_LAST_POS (i)) /* Move right. */ |
195d1361 RS |
237 | { |
238 | if (count < 0) | |
f902a008 | 239 | error ("Error in syntax_table logic for intervals ->"); |
195d1361 | 240 | /* Update the interval. */ |
6a140a74 | 241 | i = update_interval (i, charpos); |
bb0de084 | 242 | if (i->position != gl_state.e_property) |
195d1361 RS |
243 | { |
244 | invalidate = 0; | |
195d1361 | 245 | gl_state.backward_i = i; |
bb0de084 | 246 | gl_state.b_property = i->position - gl_state.offset; |
195d1361 RS |
247 | } |
248 | } | |
195d1361 RS |
249 | |
250 | update: | |
251 | tmp_table = textget (i->plist, Qsyntax_table); | |
252 | ||
253 | if (invalidate) | |
254 | invalidate = !EQ (tmp_table, gl_state.old_prop); /* Need to invalidate? */ | |
7d0393cf | 255 | |
423e705d SM |
256 | if (invalidate) /* Did not get to adjacent interval. */ |
257 | { /* with the same table => */ | |
258 | /* invalidate the old range. */ | |
195d1361 RS |
259 | if (count > 0) |
260 | { | |
261 | gl_state.backward_i = i; | |
bb0de084 SM |
262 | gl_state.b_property = i->position - gl_state.offset; |
263 | } | |
264 | else | |
195d1361 | 265 | { |
bb0de084 | 266 | gl_state.forward_i = i; |
ee0cdb48 | 267 | gl_state.e_property = INTERVAL_LAST_POS (i) - gl_state.offset; |
195d1361 RS |
268 | } |
269 | } | |
37bef230 | 270 | |
bb0de084 | 271 | if (!EQ (tmp_table, gl_state.old_prop)) |
195d1361 | 272 | { |
bb0de084 SM |
273 | gl_state.current_syntax_table = tmp_table; |
274 | gl_state.old_prop = tmp_table; | |
275 | if (EQ (Fsyntax_table_p (tmp_table), Qt)) | |
276 | { | |
277 | gl_state.use_global = 0; | |
7d0393cf | 278 | } |
bb0de084 SM |
279 | else if (CONSP (tmp_table)) |
280 | { | |
281 | gl_state.use_global = 1; | |
282 | gl_state.global_code = tmp_table; | |
283 | } | |
7d0393cf | 284 | else |
bb0de084 SM |
285 | { |
286 | gl_state.use_global = 0; | |
4b4deea2 | 287 | gl_state.current_syntax_table = BVAR (current_buffer, syntax_table); |
bb0de084 | 288 | } |
195d1361 RS |
289 | } |
290 | ||
291 | while (!NULL_INTERVAL_P (i)) | |
292 | { | |
293 | if (cnt && !EQ (tmp_table, textget (i->plist, Qsyntax_table))) | |
294 | { | |
295 | if (count > 0) | |
bb0de084 SM |
296 | { |
297 | gl_state.e_property = i->position - gl_state.offset; | |
298 | gl_state.forward_i = i; | |
299 | } | |
300 | else | |
301 | { | |
5a774522 SM |
302 | gl_state.b_property |
303 | = i->position + LENGTH (i) - gl_state.offset; | |
bb0de084 SM |
304 | gl_state.backward_i = i; |
305 | } | |
306 | return; | |
195d1361 | 307 | } |
7d0393cf | 308 | else if (cnt == INTERVALS_AT_ONCE) |
195d1361 RS |
309 | { |
310 | if (count > 0) | |
bb0de084 | 311 | { |
5a774522 SM |
312 | gl_state.e_property |
313 | = i->position + LENGTH (i) - gl_state.offset | |
314 | /* e_property at EOB is not set to ZV but to ZV+1, so that | |
315 | we can do INC(from);UPDATE_SYNTAX_TABLE_FORWARD without | |
316 | having to check eob between the two. */ | |
317 | + (NULL_INTERVAL_P (next_interval (i)) ? 1 : 0); | |
bb0de084 SM |
318 | gl_state.forward_i = i; |
319 | } | |
320 | else | |
321 | { | |
322 | gl_state.b_property = i->position - gl_state.offset; | |
323 | gl_state.backward_i = i; | |
324 | } | |
325 | return; | |
195d1361 RS |
326 | } |
327 | cnt++; | |
328 | i = count > 0 ? next_interval (i) : previous_interval (i); | |
329 | } | |
bb0de084 SM |
330 | eassert (NULL_INTERVAL_P (i)); /* This property goes to the end. */ |
331 | if (count > 0) | |
332 | gl_state.e_property = gl_state.stop; | |
333 | else | |
334 | gl_state.b_property = gl_state.start; | |
195d1361 RS |
335 | } |
336 | \f | |
6a140a74 RS |
337 | /* Returns TRUE if char at CHARPOS is quoted. |
338 | Global syntax-table data should be set up already to be good at CHARPOS | |
339 | or after. On return global syntax data is good for lookup at CHARPOS. */ | |
195d1361 RS |
340 | |
341 | static int | |
d311d28c | 342 | char_quoted (ptrdiff_t charpos, ptrdiff_t bytepos) |
195d1361 RS |
343 | { |
344 | register enum syntaxcode code; | |
d311d28c | 345 | register ptrdiff_t beg = BEGV; |
195d1361 | 346 | register int quoted = 0; |
d311d28c | 347 | ptrdiff_t orig = charpos; |
6a140a74 | 348 | |
02d8b017 | 349 | while (charpos > beg) |
195d1361 | 350 | { |
ab229fdd | 351 | int c; |
02d8b017 | 352 | DEC_BOTH (charpos, bytepos); |
ab229fdd | 353 | |
6a140a74 | 354 | UPDATE_SYNTAX_TABLE_BACKWARD (charpos); |
327719ee | 355 | c = FETCH_CHAR_AS_MULTIBYTE (bytepos); |
ab229fdd | 356 | code = SYNTAX (c); |
6a140a74 RS |
357 | if (! (code == Scharquote || code == Sescape)) |
358 | break; | |
359 | ||
6a140a74 | 360 | quoted = !quoted; |
195d1361 | 361 | } |
6a140a74 RS |
362 | |
363 | UPDATE_SYNTAX_TABLE (orig); | |
195d1361 RS |
364 | return quoted; |
365 | } | |
6a140a74 | 366 | |
6a140a74 RS |
367 | /* Return the bytepos one character before BYTEPOS. |
368 | We assume that BYTEPOS is not at the start of the buffer. */ | |
369 | ||
d311d28c PE |
370 | static inline ptrdiff_t |
371 | dec_bytepos (ptrdiff_t bytepos) | |
6a140a74 | 372 | { |
4b4deea2 | 373 | if (NILP (BVAR (current_buffer, enable_multibyte_characters))) |
ef316cf0 RS |
374 | return bytepos - 1; |
375 | ||
6a140a74 RS |
376 | DEC_POS (bytepos); |
377 | return bytepos; | |
378 | } | |
195d1361 | 379 | \f |
2b34df4e | 380 | /* Return a defun-start position before POS and not too far before. |
7cc80f0a RS |
381 | It should be the last one before POS, or nearly the last. |
382 | ||
383 | When open_paren_in_column_0_is_defun_start is nonzero, | |
1fd1cc2f | 384 | only the beginning of the buffer is treated as a defun-start. |
7cc80f0a RS |
385 | |
386 | We record the information about where the scan started | |
387 | and what its result was, so that another call in the same area | |
388 | can return the same value very quickly. | |
195d1361 RS |
389 | |
390 | There is no promise at which position the global syntax data is | |
391 | valid on return from the subroutine, so the caller should explicitly | |
392 | update the global data. */ | |
37bef230 | 393 | |
d311d28c PE |
394 | static ptrdiff_t |
395 | find_defun_start (ptrdiff_t pos, ptrdiff_t pos_byte) | |
37bef230 | 396 | { |
d311d28c | 397 | ptrdiff_t opoint = PT, opoint_byte = PT_BYTE; |
37bef230 | 398 | |
1fd1cc2f RS |
399 | if (!open_paren_in_column_0_is_defun_start) |
400 | { | |
6e20a0d4 | 401 | find_start_value = BEGV; |
1fd1cc2f | 402 | find_start_value_byte = BEGV_BYTE; |
6e20a0d4 CY |
403 | find_start_buffer = current_buffer; |
404 | find_start_modiff = MODIFF; | |
405 | find_start_begv = BEGV; | |
406 | find_start_pos = pos; | |
1fd1cc2f RS |
407 | return BEGV; |
408 | } | |
409 | ||
37bef230 RS |
410 | /* Use previous finding, if it's valid and applies to this inquiry. */ |
411 | if (current_buffer == find_start_buffer | |
412 | /* Reuse the defun-start even if POS is a little farther on. | |
413 | POS might be in the next defun, but that's ok. | |
414 | Our value may not be the best possible, but will still be usable. */ | |
415 | && pos <= find_start_pos + 1000 | |
416 | && pos >= find_start_value | |
417 | && BEGV == find_start_begv | |
418 | && MODIFF == find_start_modiff) | |
419 | return find_start_value; | |
420 | ||
421 | /* Back up to start of line. */ | |
6a140a74 | 422 | scan_newline (pos, pos_byte, BEGV, BEGV_BYTE, -1, 1); |
37bef230 | 423 | |
195d1361 RS |
424 | /* We optimize syntax-table lookup for rare updates. Thus we accept |
425 | only those `^\s(' which are good in global _and_ text-property | |
426 | syntax-tables. */ | |
d48cd3f4 | 427 | SETUP_BUFFER_SYNTAX_TABLE (); |
1fd1cc2f | 428 | while (PT > BEGV) |
37bef230 | 429 | { |
ab229fdd AS |
430 | int c; |
431 | ||
1fd1cc2f RS |
432 | /* Open-paren at start of line means we may have found our |
433 | defun-start. */ | |
327719ee | 434 | c = FETCH_CHAR_AS_MULTIBYTE (PT_BYTE); |
ab229fdd | 435 | if (SYNTAX (c) == Sopen) |
195d1361 | 436 | { |
1fd1cc2f | 437 | SETUP_SYNTAX_TABLE (PT + 1, -1); /* Try again... */ |
327719ee | 438 | c = FETCH_CHAR_AS_MULTIBYTE (PT_BYTE); |
ab229fdd | 439 | if (SYNTAX (c) == Sopen) |
1fd1cc2f RS |
440 | break; |
441 | /* Now fallback to the default value. */ | |
d48cd3f4 | 442 | SETUP_BUFFER_SYNTAX_TABLE (); |
195d1361 | 443 | } |
1fd1cc2f RS |
444 | /* Move to beg of previous line. */ |
445 | scan_newline (PT, PT_BYTE, BEGV, BEGV_BYTE, -2, 1); | |
37bef230 RS |
446 | } |
447 | ||
448 | /* Record what we found, for the next try. */ | |
6a140a74 RS |
449 | find_start_value = PT; |
450 | find_start_value_byte = PT_BYTE; | |
37bef230 RS |
451 | find_start_buffer = current_buffer; |
452 | find_start_modiff = MODIFF; | |
453 | find_start_begv = BEGV; | |
454 | find_start_pos = pos; | |
455 | ||
6a140a74 RS |
456 | TEMP_SET_PT_BOTH (opoint, opoint_byte); |
457 | ||
37bef230 RS |
458 | return find_start_value; |
459 | } | |
460 | \f | |
f902a008 RS |
461 | /* Return the SYNTAX_COMEND_FIRST of the character before POS, POS_BYTE. */ |
462 | ||
463 | static int | |
d311d28c | 464 | prev_char_comend_first (ptrdiff_t pos, ptrdiff_t pos_byte) |
f902a008 RS |
465 | { |
466 | int c, val; | |
467 | ||
468 | DEC_BOTH (pos, pos_byte); | |
469 | UPDATE_SYNTAX_TABLE_BACKWARD (pos); | |
470 | c = FETCH_CHAR (pos_byte); | |
471 | val = SYNTAX_COMEND_FIRST (c); | |
472 | UPDATE_SYNTAX_TABLE_FORWARD (pos + 1); | |
473 | return val; | |
474 | } | |
475 | ||
476 | /* Return the SYNTAX_COMSTART_FIRST of the character before POS, POS_BYTE. */ | |
477 | ||
3f679f55 SM |
478 | /* static int |
479 | * prev_char_comstart_first (pos, pos_byte) | |
480 | * int pos, pos_byte; | |
481 | * { | |
482 | * int c, val; | |
7d0393cf | 483 | * |
3f679f55 SM |
484 | * DEC_BOTH (pos, pos_byte); |
485 | * UPDATE_SYNTAX_TABLE_BACKWARD (pos); | |
486 | * c = FETCH_CHAR (pos_byte); | |
487 | * val = SYNTAX_COMSTART_FIRST (c); | |
488 | * UPDATE_SYNTAX_TABLE_FORWARD (pos + 1); | |
489 | * return val; | |
490 | * } */ | |
f902a008 | 491 | |
6a140a74 RS |
492 | /* Checks whether charpos FROM is at the end of a comment. |
493 | FROM_BYTE is the bytepos corresponding to FROM. | |
494 | Do not move back before STOP. | |
495 | ||
496 | Return a positive value if we find a comment ending at FROM/FROM_BYTE; | |
497 | return -1 otherwise. | |
498 | ||
499 | If successful, store the charpos of the comment's beginning | |
500 | into *CHARPOS_PTR, and the bytepos into *BYTEPOS_PTR. | |
527a32d9 KH |
501 | |
502 | Global syntax data remains valid for backward search starting at | |
503 | the returned value (or at FROM, if the search was not successful). */ | |
195d1361 RS |
504 | |
505 | static int | |
d311d28c | 506 | back_comment (ptrdiff_t from, ptrdiff_t from_byte, ptrdiff_t stop, int comnested, int comstyle, ptrdiff_t *charpos_ptr, ptrdiff_t *bytepos_ptr) |
195d1361 RS |
507 | { |
508 | /* Look back, counting the parity of string-quotes, | |
509 | and recording the comment-starters seen. | |
510 | When we reach a safe place, assume that's not in a string; | |
511 | then step the main scan to the earliest comment-starter seen | |
512 | an even number of string quotes away from the safe place. | |
513 | ||
514 | OFROM[I] is position of the earliest comment-starter seen | |
515 | which is I+2X quotes from the comment-end. | |
516 | PARITY is current parity of quotes from the comment end. */ | |
3ee5041c | 517 | int string_style = -1; /* Presumed outside of any string. */ |
195d1361 | 518 | int string_lossage = 0; |
f7c436c1 | 519 | /* Not a real lossage: indicates that we have passed a matching comment |
7d0393cf | 520 | starter plus a non-matching comment-ender, meaning that any matching |
f7c436c1 SM |
521 | comment-starter we might see later could be a false positive (hidden |
522 | inside another comment). | |
523 | Test case: { a (* b } c (* d *) */ | |
524 | int comment_lossage = 0; | |
d311d28c PE |
525 | ptrdiff_t comment_end = from; |
526 | ptrdiff_t comment_end_byte = from_byte; | |
527 | ptrdiff_t comstart_pos = 0; | |
528 | ptrdiff_t comstart_byte IF_LINT (= 0); | |
eb35b628 RS |
529 | /* Place where the containing defun starts, |
530 | or 0 if we didn't come across it yet. */ | |
d311d28c PE |
531 | ptrdiff_t defun_start = 0; |
532 | ptrdiff_t defun_start_byte = 0; | |
195d1361 | 533 | register enum syntaxcode code; |
95ff8dfc | 534 | int nesting = 1; /* current comment nesting */ |
ea315ed6 | 535 | int c; |
3f679f55 SM |
536 | int syntax = 0; |
537 | ||
538 | /* FIXME: A }} comment-ender style leads to incorrect behavior | |
539 | in the case of {{ c }}} because we ignore the last two chars which are | |
540 | assumed to be comment-enders although they aren't. */ | |
195d1361 RS |
541 | |
542 | /* At beginning of range to scan, we're outside of strings; | |
543 | that determines quote parity to the comment-end. */ | |
544 | while (from != stop) | |
545 | { | |
d311d28c | 546 | ptrdiff_t temp_byte; |
4f3a2f8d | 547 | int prev_syntax, com2start, com2end; |
fbb3da77 | 548 | int comstart; |
6a140a74 | 549 | |
195d1361 | 550 | /* Move back and examine a character. */ |
6a140a74 | 551 | DEC_BOTH (from, from_byte); |
195d1361 RS |
552 | UPDATE_SYNTAX_TABLE_BACKWARD (from); |
553 | ||
3f679f55 | 554 | prev_syntax = syntax; |
b7dbcc19 | 555 | c = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
3f679f55 | 556 | syntax = SYNTAX_WITH_FLAGS (c); |
195d1361 RS |
557 | code = SYNTAX (c); |
558 | ||
3f679f55 SM |
559 | /* Check for 2-char comment markers. */ |
560 | com2start = (SYNTAX_FLAGS_COMSTART_FIRST (syntax) | |
561 | && SYNTAX_FLAGS_COMSTART_SECOND (prev_syntax) | |
c5683ceb SM |
562 | && (comstyle |
563 | == SYNTAX_FLAGS_COMMENT_STYLE (prev_syntax, syntax)) | |
3f679f55 SM |
564 | && (SYNTAX_FLAGS_COMMENT_NESTED (prev_syntax) |
565 | || SYNTAX_FLAGS_COMMENT_NESTED (syntax)) == comnested); | |
566 | com2end = (SYNTAX_FLAGS_COMEND_FIRST (syntax) | |
567 | && SYNTAX_FLAGS_COMEND_SECOND (prev_syntax)); | |
fbb3da77 | 568 | comstart = (com2start || code == Scomment); |
01f44d5a | 569 | |
3f679f55 SM |
570 | /* Nasty cases with overlapping 2-char comment markers: |
571 | - snmp-mode: -- c -- foo -- c -- | |
572 | --- c -- | |
573 | ------ c -- | |
574 | - c-mode: *||* | |
575 | |* *|* *| | |
576 | |*| |* |*| | |
577 | /// */ | |
578 | ||
579 | /* If a 2-char comment sequence partly overlaps with another, | |
fbb3da77 SM |
580 | we don't try to be clever. E.g. |*| in C, or }% in modes that |
581 | have %..\n and %{..}%. */ | |
582 | if (from > stop && (com2end || comstart)) | |
195d1361 | 583 | { |
d311d28c | 584 | ptrdiff_t next = from, next_byte = from_byte; |
4f3a2f8d | 585 | int next_c, next_syntax; |
3f679f55 SM |
586 | DEC_BOTH (next, next_byte); |
587 | UPDATE_SYNTAX_TABLE_BACKWARD (next); | |
b7dbcc19 | 588 | next_c = FETCH_CHAR_AS_MULTIBYTE (next_byte); |
3f679f55 | 589 | next_syntax = SYNTAX_WITH_FLAGS (next_c); |
fbb3da77 | 590 | if (((comstart || comnested) |
3f679f55 SM |
591 | && SYNTAX_FLAGS_COMEND_SECOND (syntax) |
592 | && SYNTAX_FLAGS_COMEND_FIRST (next_syntax)) | |
593 | || ((com2end || comnested) | |
594 | && SYNTAX_FLAGS_COMSTART_SECOND (syntax) | |
c5683ceb SM |
595 | && (comstyle |
596 | == SYNTAX_FLAGS_COMMENT_STYLE (syntax, prev_syntax)) | |
3f679f55 SM |
597 | && SYNTAX_FLAGS_COMSTART_FIRST (next_syntax))) |
598 | goto lossage; | |
599 | /* UPDATE_SYNTAX_TABLE_FORWARD (next + 1); */ | |
f902a008 | 600 | } |
3f679f55 SM |
601 | |
602 | if (com2start && comstart_pos == 0) | |
603 | /* We're looking at a comment starter. But it might be a comment | |
604 | ender as well (see snmp-mode). The first time we see one, we | |
605 | need to consider it as a comment starter, | |
606 | and the subsequent times as a comment ender. */ | |
607 | com2end = 0; | |
608 | ||
609 | /* Turn a 2-char comment sequences into the appropriate syntax. */ | |
610 | if (com2end) | |
611 | code = Sendcomment; | |
612 | else if (com2start) | |
613 | code = Scomment; | |
614 | /* Ignore comment starters of a different style. */ | |
615 | else if (code == Scomment | |
c5683ceb | 616 | && (comstyle != SYNTAX_FLAGS_COMMENT_STYLE (syntax, 0) |
3f679f55 | 617 | || SYNTAX_FLAGS_COMMENT_NESTED (syntax) != comnested)) |
1aa963c8 | 618 | continue; |
195d1361 | 619 | |
9828a477 KH |
620 | /* Ignore escaped characters, except comment-enders. */ |
621 | if (code != Sendcomment && char_quoted (from, from_byte)) | |
195d1361 RS |
622 | continue; |
623 | ||
3ee5041c | 624 | switch (code) |
195d1361 | 625 | { |
3ee5041c SM |
626 | case Sstring_fence: |
627 | case Scomment_fence: | |
628 | c = (code == Sstring_fence ? ST_STRING_STYLE : ST_COMMENT_STYLE); | |
629 | case Sstring: | |
630 | /* Track parity of quotes. */ | |
631 | if (string_style == -1) | |
632 | /* Entering a string. */ | |
633 | string_style = c; | |
634 | else if (string_style == c) | |
635 | /* Leaving the string. */ | |
636 | string_style = -1; | |
637 | else | |
638 | /* If we have two kinds of string delimiters. | |
639 | There's no way to grok this scanning backwards. */ | |
195d1361 | 640 | string_lossage = 1; |
3ee5041c | 641 | break; |
7d0393cf | 642 | |
3ee5041c SM |
643 | case Scomment: |
644 | /* We've already checked that it is the relevant comstyle. */ | |
f7c436c1 | 645 | if (string_style != -1 || comment_lossage || string_lossage) |
3ee5041c SM |
646 | /* There are odd string quotes involved, so let's be careful. |
647 | Test case in Pascal: " { " a { " } */ | |
648 | goto lossage; | |
649 | ||
f7c436c1 SM |
650 | if (!comnested) |
651 | { | |
652 | /* Record best comment-starter so far. */ | |
653 | comstart_pos = from; | |
654 | comstart_byte = from_byte; | |
655 | } | |
656 | else if (--nesting <= 0) | |
95ff8dfc RS |
657 | /* nested comments have to be balanced, so we don't need to |
658 | keep looking for earlier ones. We use here the same (slightly | |
659 | incorrect) reasoning as below: since it is followed by uniform | |
660 | paired string quotes, this comment-start has to be outside of | |
661 | strings, else the comment-end itself would be inside a string. */ | |
662 | goto done; | |
3ee5041c SM |
663 | break; |
664 | ||
02010917 | 665 | case Sendcomment: |
c5683ceb | 666 | if (SYNTAX_FLAGS_COMMENT_STYLE (syntax, 0) == comstyle |
d070eb22 | 667 | && ((com2end && SYNTAX_FLAGS_COMMENT_NESTED (prev_syntax)) |
3f679f55 | 668 | || SYNTAX_FLAGS_COMMENT_NESTED (syntax)) == comnested) |
02010917 SM |
669 | /* This is the same style of comment ender as ours. */ |
670 | { | |
671 | if (comnested) | |
672 | nesting++; | |
673 | else | |
674 | /* Anything before that can't count because it would match | |
675 | this comment-ender rather than ours. */ | |
676 | from = stop; /* Break out of the loop. */ | |
677 | } | |
f7c436c1 SM |
678 | else if (comstart_pos != 0 || c != '\n') |
679 | /* We're mixing comment styles here, so we'd better be careful. | |
680 | The (comstart_pos != 0 || c != '\n') check is not quite correct | |
681 | (we should just always set comment_lossage), but removing it | |
682 | would imply that any multiline comment in C would go through | |
683 | lossage, which seems overkill. | |
684 | The failure should only happen in the rare cases such as | |
685 | { (* } *) */ | |
686 | comment_lossage = 1; | |
02010917 | 687 | break; |
195d1361 | 688 | |
02010917 SM |
689 | case Sopen: |
690 | /* Assume a defun-start point is outside of strings. */ | |
691 | if (open_paren_in_column_0_is_defun_start | |
692 | && (from == stop | |
693 | || (temp_byte = dec_bytepos (from_byte), | |
694 | FETCH_CHAR (temp_byte) == '\n'))) | |
695 | { | |
696 | defun_start = from; | |
697 | defun_start_byte = from_byte; | |
698 | from = stop; /* Break out of the loop. */ | |
699 | } | |
eb35b628 | 700 | break; |
02010917 SM |
701 | |
702 | default: | |
f7c436c1 | 703 | break; |
eb35b628 | 704 | } |
195d1361 RS |
705 | } |
706 | ||
707 | if (comstart_pos == 0) | |
708 | { | |
709 | from = comment_end; | |
6a140a74 | 710 | from_byte = comment_end_byte; |
195d1361 RS |
711 | UPDATE_SYNTAX_TABLE_FORWARD (comment_end - 1); |
712 | } | |
f7c436c1 SM |
713 | /* If comstart_pos is set and we get here (ie. didn't jump to `lossage' |
714 | or `done'), then we've found the beginning of the non-nested comment. */ | |
715 | else if (1) /* !comnested */ | |
195d1361 RS |
716 | { |
717 | from = comstart_pos; | |
6a140a74 | 718 | from_byte = comstart_byte; |
789f3320 | 719 | UPDATE_SYNTAX_TABLE_FORWARD (from - 1); |
195d1361 RS |
720 | } |
721 | else | |
722 | { | |
3ee5041c SM |
723 | struct lisp_parse_state state; |
724 | lossage: | |
195d1361 RS |
725 | /* We had two kinds of string delimiters mixed up |
726 | together. Decode this going forwards. | |
02010917 | 727 | Scan fwd from a known safe place (beginning-of-defun) |
195d1361 RS |
728 | to the one in question; this records where we |
729 | last passed a comment starter. */ | |
eb35b628 RS |
730 | /* If we did not already find the defun start, find it now. */ |
731 | if (defun_start == 0) | |
732 | { | |
733 | defun_start = find_defun_start (comment_end, comment_end_byte); | |
734 | defun_start_byte = find_start_value_byte; | |
735 | } | |
02010917 | 736 | do |
195d1361 | 737 | { |
02010917 SM |
738 | scan_sexps_forward (&state, |
739 | defun_start, defun_start_byte, | |
d311d28c PE |
740 | comment_end, TYPE_MINIMUM (EMACS_INT), |
741 | 0, Qnil, 0); | |
02010917 SM |
742 | defun_start = comment_end; |
743 | if (state.incomment == (comnested ? 1 : -1) | |
744 | && state.comstyle == comstyle) | |
745 | from = state.comstr_start; | |
746 | else | |
747 | { | |
748 | from = comment_end; | |
749 | if (state.incomment) | |
750 | /* If comment_end is inside some other comment, maybe ours | |
751 | is nested, so we need to try again from within the | |
752 | surrounding comment. Example: { a (* " *) */ | |
753 | { | |
754 | /* FIXME: We should advance by one or two chars. */ | |
755 | defun_start = state.comstr_start + 2; | |
756 | defun_start_byte = CHAR_TO_BYTE (defun_start); | |
757 | } | |
758 | } | |
759 | } while (defun_start < comment_end); | |
760 | ||
6a140a74 | 761 | from_byte = CHAR_TO_BYTE (from); |
195d1361 RS |
762 | UPDATE_SYNTAX_TABLE_FORWARD (from - 1); |
763 | } | |
7d0393cf | 764 | |
95ff8dfc | 765 | done: |
6a140a74 RS |
766 | *charpos_ptr = from; |
767 | *bytepos_ptr = from_byte; | |
768 | ||
1aa963c8 | 769 | return (from == comment_end) ? -1 : from; |
195d1361 RS |
770 | } |
771 | \f | |
8489eb67 | 772 | DEFUN ("syntax-table-p", Fsyntax_table_p, Ssyntax_table_p, 1, 1, 0, |
fdb82f93 PJ |
773 | doc: /* Return t if OBJECT is a syntax table. |
774 | Currently, any char-table counts as a syntax table. */) | |
5842a27b | 775 | (Lisp_Object object) |
8489eb67 | 776 | { |
2203e1e8 | 777 | if (CHAR_TABLE_P (object) |
e704cb4b | 778 | && EQ (XCHAR_TABLE (object)->purpose, Qsyntax_table)) |
8489eb67 RS |
779 | return Qt; |
780 | return Qnil; | |
781 | } | |
782 | ||
8ea151b2 | 783 | static void |
971de7fb | 784 | check_syntax_table (Lisp_Object obj) |
8489eb67 | 785 | { |
47f5f6ae KS |
786 | CHECK_TYPE (CHAR_TABLE_P (obj) && EQ (XCHAR_TABLE (obj)->purpose, Qsyntax_table), |
787 | Qsyntax_table_p, obj); | |
7d0393cf | 788 | } |
8489eb67 | 789 | |
8489eb67 | 790 | DEFUN ("syntax-table", Fsyntax_table, Ssyntax_table, 0, 0, 0, |
fdb82f93 PJ |
791 | doc: /* Return the current syntax table. |
792 | This is the one specified by the current buffer. */) | |
5842a27b | 793 | (void) |
8489eb67 | 794 | { |
4b4deea2 | 795 | return BVAR (current_buffer, syntax_table); |
8489eb67 RS |
796 | } |
797 | ||
798 | DEFUN ("standard-syntax-table", Fstandard_syntax_table, | |
799 | Sstandard_syntax_table, 0, 0, 0, | |
fdb82f93 PJ |
800 | doc: /* Return the standard syntax table. |
801 | This is the one used for new buffers. */) | |
5842a27b | 802 | (void) |
8489eb67 RS |
803 | { |
804 | return Vstandard_syntax_table; | |
805 | } | |
806 | ||
807 | DEFUN ("copy-syntax-table", Fcopy_syntax_table, Scopy_syntax_table, 0, 1, 0, | |
fdb82f93 PJ |
808 | doc: /* Construct a new syntax table and return it. |
809 | It is a copy of the TABLE, which defaults to the standard syntax table. */) | |
5842a27b | 810 | (Lisp_Object table) |
8489eb67 | 811 | { |
8ea151b2 RS |
812 | Lisp_Object copy; |
813 | ||
265a9e55 | 814 | if (!NILP (table)) |
8ea151b2 RS |
815 | check_syntax_table (table); |
816 | else | |
817 | table = Vstandard_syntax_table; | |
818 | ||
819 | copy = Fcopy_sequence (table); | |
0f867324 RS |
820 | |
821 | /* Only the standard syntax table should have a default element. | |
822 | Other syntax tables should inherit from parents instead. */ | |
823 | XCHAR_TABLE (copy)->defalt = Qnil; | |
824 | ||
825 | /* Copied syntax tables should all have parents. | |
826 | If we copied one with no parent, such as the standard syntax table, | |
827 | use the standard syntax table as the copy's parent. */ | |
828 | if (NILP (XCHAR_TABLE (copy)->parent)) | |
829 | Fset_char_table_parent (copy, Vstandard_syntax_table); | |
8ea151b2 | 830 | return copy; |
8489eb67 RS |
831 | } |
832 | ||
833 | DEFUN ("set-syntax-table", Fset_syntax_table, Sset_syntax_table, 1, 1, 0, | |
fdb82f93 PJ |
834 | doc: /* Select a new syntax table for the current buffer. |
835 | One argument, a syntax table. */) | |
5842a27b | 836 | (Lisp_Object table) |
8489eb67 | 837 | { |
4e4dfa78 | 838 | int idx; |
8ea151b2 | 839 | check_syntax_table (table); |
4b4deea2 | 840 | BVAR (current_buffer, syntax_table) = table; |
8489eb67 | 841 | /* Indicate that this buffer now has a specified syntax table. */ |
f6cd0527 GM |
842 | idx = PER_BUFFER_VAR_IDX (syntax_table); |
843 | SET_PER_BUFFER_VALUE_P (current_buffer, idx, 1); | |
8489eb67 RS |
844 | return table; |
845 | } | |
846 | \f | |
847 | /* Convert a letter which signifies a syntax code | |
848 | into the code it signifies. | |
195d1361 | 849 | This is used by modify-syntax-entry, and other things. */ |
8489eb67 RS |
850 | |
851 | unsigned char syntax_spec_code[0400] = | |
852 | { 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
853 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
854 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
855 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
195d1361 | 856 | (char) Swhitespace, (char) Scomment_fence, (char) Sstring, 0377, |
8489eb67 RS |
857 | (char) Smath, 0377, 0377, (char) Squote, |
858 | (char) Sopen, (char) Sclose, 0377, 0377, | |
859 | 0377, (char) Swhitespace, (char) Spunct, (char) Scharquote, | |
860 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
861 | 0377, 0377, 0377, 0377, | |
862 | (char) Scomment, 0377, (char) Sendcomment, 0377, | |
6cb71bf6 | 863 | (char) Sinherit, 0377, 0377, 0377, 0377, 0377, 0377, 0377, /* @, A ... */ |
8489eb67 RS |
864 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, |
865 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, (char) Sword, | |
866 | 0377, 0377, 0377, 0377, (char) Sescape, 0377, 0377, (char) Ssymbol, | |
867 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, /* `, a, ... */ | |
868 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
869 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, (char) Sword, | |
195d1361 | 870 | 0377, 0377, 0377, 0377, (char) Sstring_fence, 0377, 0377, 0377 |
8489eb67 RS |
871 | }; |
872 | ||
195d1361 | 873 | /* Indexed by syntax code, give the letter that describes it. */ |
8489eb67 | 874 | |
195d1361 | 875 | char syntax_code_spec[16] = |
8489eb67 | 876 | { |
195d1361 RS |
877 | ' ', '.', 'w', '_', '(', ')', '\'', '\"', '$', '\\', '/', '<', '>', '@', |
878 | '!', '|' | |
8489eb67 | 879 | }; |
93da5fff KH |
880 | |
881 | /* Indexed by syntax code, give the object (cons of syntax code and | |
882 | nil) to be stored in syntax table. Since these objects can be | |
883 | shared among syntax tables, we generate them in advance. By | |
884 | sharing objects, the function `describe-syntax' can give a more | |
885 | compact listing. */ | |
886 | static Lisp_Object Vsyntax_code_object; | |
887 | ||
8489eb67 RS |
888 | \f |
889 | DEFUN ("char-syntax", Fchar_syntax, Schar_syntax, 1, 1, 0, | |
fdb82f93 | 890 | doc: /* Return the syntax code of CHARACTER, described by a character. |
e2b6daf4 CY |
891 | For example, if CHARACTER is a word constituent, the |
892 | character `w' (119) is returned. | |
fdb82f93 PJ |
893 | The characters that correspond to various syntax codes |
894 | are listed in the documentation of `modify-syntax-entry'. */) | |
5842a27b | 895 | (Lisp_Object character) |
8489eb67 | 896 | { |
8ea151b2 | 897 | int char_int; |
774b9a60 | 898 | CHECK_CHARACTER (character); |
2203e1e8 | 899 | char_int = XINT (character); |
d48cd3f4 | 900 | SETUP_BUFFER_SYNTAX_TABLE (); |
8ea151b2 | 901 | return make_number (syntax_code_spec[(int) SYNTAX (char_int)]); |
beefa22e RS |
902 | } |
903 | ||
904 | DEFUN ("matching-paren", Fmatching_paren, Smatching_paren, 1, 1, 0, | |
fdb82f93 | 905 | doc: /* Return the matching parenthesis of CHARACTER, or nil if none. */) |
5842a27b | 906 | (Lisp_Object character) |
beefa22e | 907 | { |
8ea151b2 | 908 | int char_int, code; |
b7826503 | 909 | CHECK_NUMBER (character); |
2203e1e8 | 910 | char_int = XINT (character); |
d48cd3f4 | 911 | SETUP_BUFFER_SYNTAX_TABLE (); |
8ea151b2 | 912 | code = SYNTAX (char_int); |
a8bd7cd8 | 913 | if (code == Sopen || code == Sclose) |
2e34157c | 914 | return SYNTAX_MATCH (char_int); |
beefa22e | 915 | return Qnil; |
8489eb67 RS |
916 | } |
917 | ||
c65adb44 | 918 | DEFUN ("string-to-syntax", Fstring_to_syntax, Sstring_to_syntax, 1, 1, 0, |
fdb82f93 PJ |
919 | doc: /* Convert a syntax specification STRING into syntax cell form. |
920 | STRING should be a string as it is allowed as argument of | |
921 | `modify-syntax-entry'. Value is the equivalent cons cell | |
bce3dc36 | 922 | \(CODE . MATCHING-CHAR) that can be used as value of a `syntax-table' |
fdb82f93 | 923 | text property. */) |
5842a27b | 924 | (Lisp_Object string) |
8489eb67 | 925 | { |
2e567bd3 | 926 | register const unsigned char *p; |
8489eb67 | 927 | register enum syntaxcode code; |
247e20a8 | 928 | int val; |
8ea151b2 | 929 | Lisp_Object match; |
8489eb67 | 930 | |
b7826503 | 931 | CHECK_STRING (string); |
8489eb67 | 932 | |
d5db4077 | 933 | p = SDATA (string); |
8489eb67 RS |
934 | code = (enum syntaxcode) syntax_spec_code[*p++]; |
935 | if (((int) code & 0377) == 0377) | |
b764a653 | 936 | error ("Invalid syntax description letter: %c", p[-1]); |
8489eb67 | 937 | |
8ea151b2 | 938 | if (code == Sinherit) |
c65adb44 | 939 | return Qnil; |
8ea151b2 RS |
940 | |
941 | if (*p) | |
d1be9f0f | 942 | { |
93da5fff | 943 | int len; |
62a6e103 | 944 | int character = STRING_CHAR_AND_LENGTH (p, len); |
93da5fff | 945 | XSETINT (match, character); |
d1be9f0f RS |
946 | if (XFASTINT (match) == ' ') |
947 | match = Qnil; | |
93da5fff | 948 | p += len; |
d1be9f0f RS |
949 | } |
950 | else | |
8ea151b2 | 951 | match = Qnil; |
8489eb67 | 952 | |
8ea151b2 | 953 | val = (int) code; |
8489eb67 RS |
954 | while (*p) |
955 | switch (*p++) | |
956 | { | |
957 | case '1': | |
247e20a8 | 958 | val |= 1 << 16; |
8489eb67 RS |
959 | break; |
960 | ||
961 | case '2': | |
247e20a8 | 962 | val |= 1 << 17; |
8489eb67 RS |
963 | break; |
964 | ||
965 | case '3': | |
247e20a8 | 966 | val |= 1 << 18; |
8489eb67 RS |
967 | break; |
968 | ||
969 | case '4': | |
247e20a8 | 970 | val |= 1 << 19; |
8489eb67 RS |
971 | break; |
972 | ||
973 | case 'p': | |
247e20a8 | 974 | val |= 1 << 20; |
8489eb67 | 975 | break; |
e5d4f4dc RS |
976 | |
977 | case 'b': | |
247e20a8 | 978 | val |= 1 << 21; |
e5d4f4dc | 979 | break; |
95ff8dfc RS |
980 | |
981 | case 'n': | |
982 | val |= 1 << 22; | |
983 | break; | |
c5683ceb SM |
984 | |
985 | case 'c': | |
986 | val |= 1 << 23; | |
987 | break; | |
8489eb67 | 988 | } |
7d0393cf | 989 | |
77b37c05 | 990 | if (val < ASIZE (Vsyntax_code_object) && NILP (match)) |
c65adb44 | 991 | return XVECTOR (Vsyntax_code_object)->contents[val]; |
93da5fff KH |
992 | else |
993 | /* Since we can't use a shared object, let's make a new one. */ | |
c65adb44 SM |
994 | return Fcons (make_number (val), match); |
995 | } | |
996 | ||
fdb82f93 | 997 | /* I really don't know why this is interactive |
2c9e1900 | 998 | help-form should at least be made useful whilst reading the second arg. */ |
7d0393cf | 999 | DEFUN ("modify-syntax-entry", Fmodify_syntax_entry, Smodify_syntax_entry, 2, 3, |
c65adb44 | 1000 | "cSet syntax for character: \nsSet syntax for %s to: ", |
a50a10a0 | 1001 | doc: /* Set syntax for character CHAR according to string NEWENTRY. |
d7ee9fab | 1002 | The syntax is changed only for table SYNTAX-TABLE, which defaults to |
fdb82f93 | 1003 | the current buffer's syntax table. |
5c7b02ab | 1004 | CHAR may be a cons (MIN . MAX), in which case, syntaxes of all characters |
fedc6ab5 | 1005 | in the range MIN to MAX are changed. |
fdb82f93 PJ |
1006 | The first character of NEWENTRY should be one of the following: |
1007 | Space or - whitespace syntax. w word constituent. | |
1008 | _ symbol constituent. . punctuation. | |
1009 | ( open-parenthesis. ) close-parenthesis. | |
1010 | " string quote. \\ escape. | |
1011 | $ paired delimiter. ' expression quote or prefix operator. | |
1012 | < comment starter. > comment ender. | |
1013 | / character-quote. @ inherit from `standard-syntax-table'. | |
1014 | | generic string fence. ! generic comment fence. | |
1015 | ||
1016 | Only single-character comment start and end sequences are represented thus. | |
1017 | Two-character sequences are represented as described below. | |
1018 | The second character of NEWENTRY is the matching parenthesis, | |
1019 | used only if the first character is `(' or `)'. | |
1020 | Any additional characters are flags. | |
1021 | Defined flags are the characters 1, 2, 3, 4, b, p, and n. | |
a50a10a0 PJ |
1022 | 1 means CHAR is the start of a two-char comment start sequence. |
1023 | 2 means CHAR is the second character of such a sequence. | |
1024 | 3 means CHAR is the start of a two-char comment end sequence. | |
1025 | 4 means CHAR is the second character of such a sequence. | |
fdb82f93 | 1026 | |
c5683ceb | 1027 | There can be several orthogonal comment sequences. This is to support |
fdb82f93 PJ |
1028 | language modes such as C++. By default, all comment sequences are of style |
1029 | a, but you can set the comment sequence style to b (on the second character | |
c5683ceb SM |
1030 | of a comment-start, and the first character of a comment-end sequence) and/or |
1031 | c (on any of its chars) using this flag: | |
a50a10a0 | 1032 | b means CHAR is part of comment sequence b. |
c5683ceb | 1033 | c means CHAR is part of comment sequence c. |
a50a10a0 | 1034 | n means CHAR is part of a nestable comment sequence. |
fdb82f93 | 1035 | |
a50a10a0 | 1036 | p means CHAR is a prefix character for `backward-prefix-chars'; |
fdb82f93 | 1037 | such characters are treated as whitespace when they occur |
a50a10a0 | 1038 | between expressions. |
fedc6ab5 | 1039 | usage: (modify-syntax-entry CHAR NEWENTRY &optional SYNTAX-TABLE) */) |
5842a27b | 1040 | (Lisp_Object c, Lisp_Object newentry, Lisp_Object syntax_table) |
c65adb44 | 1041 | { |
5c7b02ab KH |
1042 | if (CONSP (c)) |
1043 | { | |
8f924df7 KH |
1044 | CHECK_CHARACTER_CAR (c); |
1045 | CHECK_CHARACTER_CDR (c); | |
5c7b02ab KH |
1046 | } |
1047 | else | |
1048 | CHECK_CHARACTER (c); | |
c65adb44 SM |
1049 | |
1050 | if (NILP (syntax_table)) | |
4b4deea2 | 1051 | syntax_table = BVAR (current_buffer, syntax_table); |
c65adb44 SM |
1052 | else |
1053 | check_syntax_table (syntax_table); | |
8489eb67 | 1054 | |
5c7b02ab KH |
1055 | newentry = Fstring_to_syntax (newentry); |
1056 | if (CONSP (c)) | |
1057 | SET_RAW_SYNTAX_ENTRY_RANGE (syntax_table, c, newentry); | |
1058 | else | |
1059 | SET_RAW_SYNTAX_ENTRY (syntax_table, XINT (c), newentry); | |
e5b94d44 CY |
1060 | |
1061 | /* We clear the regexp cache, since character classes can now have | |
1062 | different values from those in the compiled regexps.*/ | |
1063 | clear_regexp_cache (); | |
1064 | ||
8489eb67 RS |
1065 | return Qnil; |
1066 | } | |
1067 | \f | |
1068 | /* Dump syntax table to buffer in human-readable format */ | |
1069 | ||
62abe9cb SM |
1070 | DEFUN ("internal-describe-syntax-value", Finternal_describe_syntax_value, |
1071 | Sinternal_describe_syntax_value, 1, 1, 0, | |
1072 | doc: /* Insert a description of the internal syntax description SYNTAX at point. */) | |
5842a27b | 1073 | (Lisp_Object syntax) |
8489eb67 RS |
1074 | { |
1075 | register enum syntaxcode code; | |
c5683ceb SM |
1076 | int syntax_code; |
1077 | char desc, start1, start2, end1, end2, prefix, | |
1078 | comstyleb, comstylec, comnested; | |
8489eb67 | 1079 | char str[2]; |
62abe9cb | 1080 | Lisp_Object first, match_lisp, value = syntax; |
8489eb67 | 1081 | |
8ea151b2 RS |
1082 | if (NILP (value)) |
1083 | { | |
62abe9cb SM |
1084 | insert_string ("default"); |
1085 | return syntax; | |
8ea151b2 RS |
1086 | } |
1087 | ||
908b7fea KH |
1088 | if (CHAR_TABLE_P (value)) |
1089 | { | |
62abe9cb SM |
1090 | insert_string ("deeper char-table ..."); |
1091 | return syntax; | |
908b7fea KH |
1092 | } |
1093 | ||
8ea151b2 RS |
1094 | if (!CONSP (value)) |
1095 | { | |
62abe9cb SM |
1096 | insert_string ("invalid"); |
1097 | return syntax; | |
8ea151b2 RS |
1098 | } |
1099 | ||
c1d497be KR |
1100 | first = XCAR (value); |
1101 | match_lisp = XCDR (value); | |
8ea151b2 | 1102 | |
d311d28c | 1103 | if (!INTEGERP (first) || !(NILP (match_lisp) || CHARACTERP (match_lisp))) |
8489eb67 | 1104 | { |
62abe9cb SM |
1105 | insert_string ("invalid"); |
1106 | return syntax; | |
8489eb67 RS |
1107 | } |
1108 | ||
d311d28c | 1109 | syntax_code = XINT (first) & INT_MAX; |
c5683ceb SM |
1110 | code = (enum syntaxcode) (syntax_code & 0377); |
1111 | start1 = SYNTAX_FLAGS_COMSTART_FIRST (syntax_code); | |
1112 | start2 = SYNTAX_FLAGS_COMSTART_SECOND (syntax_code);; | |
1113 | end1 = SYNTAX_FLAGS_COMEND_FIRST (syntax_code); | |
1114 | end2 = SYNTAX_FLAGS_COMEND_SECOND (syntax_code); | |
1115 | prefix = SYNTAX_FLAGS_PREFIX (syntax_code); | |
1116 | comstyleb = SYNTAX_FLAGS_COMMENT_STYLEB (syntax_code); | |
1117 | comstylec = SYNTAX_FLAGS_COMMENT_STYLEC (syntax_code); | |
1118 | comnested = SYNTAX_FLAGS_COMMENT_NESTED (syntax_code); | |
8489eb67 RS |
1119 | |
1120 | if ((int) code < 0 || (int) code >= (int) Smax) | |
1121 | { | |
1122 | insert_string ("invalid"); | |
62abe9cb | 1123 | return syntax; |
8489eb67 RS |
1124 | } |
1125 | desc = syntax_code_spec[(int) code]; | |
1126 | ||
1127 | str[0] = desc, str[1] = 0; | |
1128 | insert (str, 1); | |
1129 | ||
93da5fff KH |
1130 | if (NILP (match_lisp)) |
1131 | insert (" ", 1); | |
1132 | else | |
1133 | insert_char (XINT (match_lisp)); | |
8489eb67 | 1134 | |
8489eb67 RS |
1135 | if (start1) |
1136 | insert ("1", 1); | |
1137 | if (start2) | |
1138 | insert ("2", 1); | |
1139 | ||
1140 | if (end1) | |
1141 | insert ("3", 1); | |
1142 | if (end2) | |
1143 | insert ("4", 1); | |
1144 | ||
1145 | if (prefix) | |
1146 | insert ("p", 1); | |
c5683ceb | 1147 | if (comstyleb) |
e5d4f4dc | 1148 | insert ("b", 1); |
c5683ceb SM |
1149 | if (comstylec) |
1150 | insert ("c", 1); | |
e6365855 SM |
1151 | if (comnested) |
1152 | insert ("n", 1); | |
8489eb67 RS |
1153 | |
1154 | insert_string ("\twhich means: "); | |
1155 | ||
0220c518 | 1156 | switch (SWITCH_ENUM_CAST (code)) |
8489eb67 RS |
1157 | { |
1158 | case Swhitespace: | |
1159 | insert_string ("whitespace"); break; | |
1160 | case Spunct: | |
1161 | insert_string ("punctuation"); break; | |
1162 | case Sword: | |
1163 | insert_string ("word"); break; | |
1164 | case Ssymbol: | |
1165 | insert_string ("symbol"); break; | |
1166 | case Sopen: | |
1167 | insert_string ("open"); break; | |
1168 | case Sclose: | |
1169 | insert_string ("close"); break; | |
1170 | case Squote: | |
d671382e | 1171 | insert_string ("prefix"); break; |
8489eb67 RS |
1172 | case Sstring: |
1173 | insert_string ("string"); break; | |
1174 | case Smath: | |
1175 | insert_string ("math"); break; | |
1176 | case Sescape: | |
1177 | insert_string ("escape"); break; | |
1178 | case Scharquote: | |
1179 | insert_string ("charquote"); break; | |
1180 | case Scomment: | |
1181 | insert_string ("comment"); break; | |
1182 | case Sendcomment: | |
1183 | insert_string ("endcomment"); break; | |
d671382e SM |
1184 | case Sinherit: |
1185 | insert_string ("inherit"); break; | |
1186 | case Scomment_fence: | |
1187 | insert_string ("comment fence"); break; | |
1188 | case Sstring_fence: | |
1189 | insert_string ("string fence"); break; | |
8489eb67 RS |
1190 | default: |
1191 | insert_string ("invalid"); | |
62abe9cb | 1192 | return syntax; |
8489eb67 RS |
1193 | } |
1194 | ||
8ea151b2 | 1195 | if (!NILP (match_lisp)) |
8489eb67 RS |
1196 | { |
1197 | insert_string (", matches "); | |
8ea151b2 | 1198 | insert_char (XINT (match_lisp)); |
8489eb67 RS |
1199 | } |
1200 | ||
1201 | if (start1) | |
1202 | insert_string (",\n\t is the first character of a comment-start sequence"); | |
1203 | if (start2) | |
1204 | insert_string (",\n\t is the second character of a comment-start sequence"); | |
1205 | ||
1206 | if (end1) | |
1207 | insert_string (",\n\t is the first character of a comment-end sequence"); | |
1208 | if (end2) | |
1209 | insert_string (",\n\t is the second character of a comment-end sequence"); | |
c5683ceb | 1210 | if (comstyleb) |
e5d4f4dc | 1211 | insert_string (" (comment style b)"); |
c5683ceb SM |
1212 | if (comstylec) |
1213 | insert_string (" (comment style c)"); | |
e6365855 SM |
1214 | if (comnested) |
1215 | insert_string (" (nestable)"); | |
e5d4f4dc | 1216 | |
8489eb67 RS |
1217 | if (prefix) |
1218 | insert_string (",\n\t is a prefix character for `backward-prefix-chars'"); | |
1219 | ||
62abe9cb SM |
1220 | return syntax; |
1221 | } | |
8489eb67 RS |
1222 | \f |
1223 | /* Return the position across COUNT words from FROM. | |
1224 | If that many words cannot be found before the end of the buffer, return 0. | |
1225 | COUNT negative means scan backward and stop at word beginning. */ | |
1226 | ||
d311d28c PE |
1227 | ptrdiff_t |
1228 | scan_words (register ptrdiff_t from, register EMACS_INT count) | |
8489eb67 | 1229 | { |
d311d28c PE |
1230 | register ptrdiff_t beg = BEGV; |
1231 | register ptrdiff_t end = ZV; | |
1232 | register ptrdiff_t from_byte = CHAR_TO_BYTE (from); | |
93da5fff KH |
1233 | register enum syntaxcode code; |
1234 | int ch0, ch1; | |
fca8fe46 | 1235 | Lisp_Object func, pos; |
8489eb67 RS |
1236 | |
1237 | immediate_quit = 1; | |
1238 | QUIT; | |
1239 | ||
195d1361 RS |
1240 | SETUP_SYNTAX_TABLE (from, count); |
1241 | ||
8489eb67 RS |
1242 | while (count > 0) |
1243 | { | |
1244 | while (1) | |
1245 | { | |
1246 | if (from == end) | |
1247 | { | |
1248 | immediate_quit = 0; | |
1249 | return 0; | |
1250 | } | |
195d1361 | 1251 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
b7dbcc19 | 1252 | ch0 = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
93da5fff | 1253 | code = SYNTAX (ch0); |
6a140a74 | 1254 | INC_BOTH (from, from_byte); |
8489eb67 RS |
1255 | if (words_include_escapes |
1256 | && (code == Sescape || code == Scharquote)) | |
1257 | break; | |
1258 | if (code == Sword) | |
1259 | break; | |
8489eb67 | 1260 | } |
93da5fff KH |
1261 | /* Now CH0 is a character which begins a word and FROM is the |
1262 | position of the next character. */ | |
8f924df7 | 1263 | func = CHAR_TABLE_REF (Vfind_word_boundary_function_table, ch0); |
869bb237 | 1264 | if (! NILP (Ffboundp (func))) |
8489eb67 | 1265 | { |
869bb237 | 1266 | pos = call2 (func, make_number (from - 1), make_number (end)); |
17f85215 | 1267 | if (INTEGERP (pos) && from < XINT (pos) && XINT (pos) <= ZV) |
8f924df7 KH |
1268 | { |
1269 | from = XINT (pos); | |
1270 | from_byte = CHAR_TO_BYTE (from); | |
1271 | } | |
8489eb67 | 1272 | } |
869bb237 | 1273 | else |
8cb8232a | 1274 | { |
8cb8232a KH |
1275 | while (1) |
1276 | { | |
1277 | if (from == end) break; | |
1278 | UPDATE_SYNTAX_TABLE_FORWARD (from); | |
b7dbcc19 | 1279 | ch1 = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
8cb8232a KH |
1280 | code = SYNTAX (ch1); |
1281 | if ((code != Sword | |
1282 | && (! words_include_escapes | |
1283 | || (code != Sescape && code != Scharquote))) | |
2b70a11c | 1284 | || word_boundary_p (ch0, ch1)) |
869bb237 | 1285 | break; |
8cb8232a KH |
1286 | INC_BOTH (from, from_byte); |
1287 | ch0 = ch1; | |
1288 | } | |
8489eb67 RS |
1289 | } |
1290 | count--; | |
1291 | } | |
1292 | while (count < 0) | |
1293 | { | |
1294 | while (1) | |
1295 | { | |
1296 | if (from == beg) | |
1297 | { | |
1298 | immediate_quit = 0; | |
1299 | return 0; | |
1300 | } | |
6a140a74 | 1301 | DEC_BOTH (from, from_byte); |
195d1361 | 1302 | UPDATE_SYNTAX_TABLE_BACKWARD (from); |
b7dbcc19 | 1303 | ch1 = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
93da5fff | 1304 | code = SYNTAX (ch1); |
8489eb67 RS |
1305 | if (words_include_escapes |
1306 | && (code == Sescape || code == Scharquote)) | |
1307 | break; | |
1308 | if (code == Sword) | |
1309 | break; | |
8489eb67 | 1310 | } |
93da5fff KH |
1311 | /* Now CH1 is a character which ends a word and FROM is the |
1312 | position of it. */ | |
8f924df7 | 1313 | func = CHAR_TABLE_REF (Vfind_word_boundary_function_table, ch1); |
869bb237 | 1314 | if (! NILP (Ffboundp (func))) |
8f924df7 | 1315 | { |
869bb237 | 1316 | pos = call2 (func, make_number (from), make_number (beg)); |
17f85215 | 1317 | if (INTEGERP (pos) && BEGV <= XINT (pos) && XINT (pos) < from) |
8f924df7 KH |
1318 | { |
1319 | from = XINT (pos); | |
1320 | from_byte = CHAR_TO_BYTE (from); | |
1321 | } | |
8489eb67 | 1322 | } |
869bb237 | 1323 | else |
8489eb67 | 1324 | { |
8cb8232a KH |
1325 | while (1) |
1326 | { | |
8cb8232a KH |
1327 | if (from == beg) |
1328 | break; | |
262be72a | 1329 | DEC_BOTH (from, from_byte); |
8cb8232a | 1330 | UPDATE_SYNTAX_TABLE_BACKWARD (from); |
262be72a | 1331 | ch0 = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
8cb8232a KH |
1332 | code = SYNTAX (ch0); |
1333 | if ((code != Sword | |
1334 | && (! words_include_escapes | |
1335 | || (code != Sescape && code != Scharquote))) | |
2b70a11c | 1336 | || word_boundary_p (ch0, ch1)) |
262be72a MB |
1337 | { |
1338 | INC_BOTH (from, from_byte); | |
1339 | break; | |
1340 | } | |
8cb8232a KH |
1341 | ch1 = ch0; |
1342 | } | |
8489eb67 RS |
1343 | } |
1344 | count++; | |
1345 | } | |
1346 | ||
1347 | immediate_quit = 0; | |
1348 | ||
1349 | return from; | |
1350 | } | |
1351 | ||
a7ca3326 | 1352 | DEFUN ("forward-word", Fforward_word, Sforward_word, 0, 1, "^p", |
fdb82f93 PJ |
1353 | doc: /* Move point forward ARG words (backward if ARG is negative). |
1354 | Normally returns t. | |
1355 | If an edge of the buffer or a field boundary is reached, point is left there | |
1356 | and the function returns nil. Field boundaries are not noticed if | |
1357 | `inhibit-field-text-motion' is non-nil. */) | |
5842a27b | 1358 | (Lisp_Object arg) |
8489eb67 | 1359 | { |
c096ae4d | 1360 | Lisp_Object tmp; |
d311d28c | 1361 | ptrdiff_t orig_val, val; |
8489eb67 | 1362 | |
839966f3 KH |
1363 | if (NILP (arg)) |
1364 | XSETFASTINT (arg, 1); | |
1365 | else | |
1366 | CHECK_NUMBER (arg); | |
1367 | ||
1368 | val = orig_val = scan_words (PT, XINT (arg)); | |
2c6ea900 | 1369 | if (! orig_val) |
839966f3 | 1370 | val = XINT (arg) > 0 ? ZV : BEGV; |
5878ee6f | 1371 | |
b8855607 | 1372 | /* Avoid jumping out of an input field. */ |
c096ae4d SM |
1373 | tmp = Fconstrain_to_field (make_number (val), make_number (PT), |
1374 | Qt, Qnil, Qnil); | |
1375 | val = XFASTINT (tmp); | |
7d0393cf | 1376 | |
8489eb67 | 1377 | SET_PT (val); |
e6d8341f | 1378 | return val == orig_val ? Qt : Qnil; |
8489eb67 RS |
1379 | } |
1380 | \f | |
a7ca3326 | 1381 | DEFUN ("skip-chars-forward", Fskip_chars_forward, Sskip_chars_forward, 1, 2, 0, |
fdb82f93 PJ |
1382 | doc: /* Move point forward, stopping before a char not in STRING, or at pos LIM. |
1383 | STRING is like the inside of a `[...]' in a regular expression | |
1384 | except that `]' is never special and `\\' quotes `^', `-' or `\\' | |
7087d5e9 | 1385 | (but not at the end of a range; quoting is never needed there). |
fdb82f93 PJ |
1386 | Thus, with arg "a-zA-Z", this skips letters stopping before first nonletter. |
1387 | With arg "^a-zA-Z", skips nonletters stopping before first letter. | |
a1bc88d4 RS |
1388 | Char classes, e.g. `[:alpha:]', are supported. |
1389 | ||
1390 | Returns the distance traveled, either zero or positive. */) | |
5842a27b | 1391 | (Lisp_Object string, Lisp_Object lim) |
195d1361 | 1392 | { |
327719ee | 1393 | return skip_chars (1, string, lim, 1); |
195d1361 RS |
1394 | } |
1395 | ||
a7ca3326 | 1396 | DEFUN ("skip-chars-backward", Fskip_chars_backward, Sskip_chars_backward, 1, 2, 0, |
fdb82f93 PJ |
1397 | doc: /* Move point backward, stopping after a char not in STRING, or at pos LIM. |
1398 | See `skip-chars-forward' for details. | |
1399 | Returns the distance traveled, either zero or negative. */) | |
5842a27b | 1400 | (Lisp_Object string, Lisp_Object lim) |
195d1361 | 1401 | { |
327719ee | 1402 | return skip_chars (0, string, lim, 1); |
195d1361 RS |
1403 | } |
1404 | ||
1405 | DEFUN ("skip-syntax-forward", Fskip_syntax_forward, Sskip_syntax_forward, 1, 2, 0, | |
fdb82f93 PJ |
1406 | doc: /* Move point forward across chars in specified syntax classes. |
1407 | SYNTAX is a string of syntax code characters. | |
1408 | Stop before a char whose syntax is not in SYNTAX, or at position LIM. | |
1409 | If SYNTAX starts with ^, skip characters whose syntax is NOT in SYNTAX. | |
1410 | This function returns the distance traveled, either zero or positive. */) | |
5842a27b | 1411 | (Lisp_Object syntax, Lisp_Object lim) |
195d1361 | 1412 | { |
b7dbcc19 | 1413 | return skip_syntaxes (1, syntax, lim); |
195d1361 RS |
1414 | } |
1415 | ||
1416 | DEFUN ("skip-syntax-backward", Fskip_syntax_backward, Sskip_syntax_backward, 1, 2, 0, | |
fdb82f93 PJ |
1417 | doc: /* Move point backward across chars in specified syntax classes. |
1418 | SYNTAX is a string of syntax code characters. | |
1419 | Stop on reaching a char whose syntax is not in SYNTAX, or at position LIM. | |
1420 | If SYNTAX starts with ^, skip characters whose syntax is NOT in SYNTAX. | |
1421 | This function returns the distance traveled, either zero or negative. */) | |
5842a27b | 1422 | (Lisp_Object syntax, Lisp_Object lim) |
195d1361 | 1423 | { |
b7dbcc19 | 1424 | return skip_syntaxes (0, syntax, lim); |
195d1361 RS |
1425 | } |
1426 | ||
6a140a74 | 1427 | static Lisp_Object |
971de7fb | 1428 | skip_chars (int forwardp, Lisp_Object string, Lisp_Object lim, int handle_iso_classes) |
195d1361 | 1429 | { |
195d1361 RS |
1430 | register unsigned int c; |
1431 | unsigned char fastmap[0400]; | |
b7dbcc19 | 1432 | /* Store the ranges of non-ASCII characters. */ |
4f63c6bb | 1433 | int *char_ranges IF_LINT (= NULL); |
7e68b0ea | 1434 | int n_char_ranges = 0; |
195d1361 | 1435 | int negate = 0; |
d311d28c | 1436 | register ptrdiff_t i, i_byte; |
b7dbcc19 KH |
1437 | /* Set to 1 if the current buffer is multibyte and the region |
1438 | contains non-ASCII chars. */ | |
1439 | int multibyte; | |
1440 | /* Set to 1 if STRING is multibyte and it contains non-ASCII | |
1441 | chars. */ | |
1674d9a2 | 1442 | int string_multibyte; |
d311d28c | 1443 | ptrdiff_t size_byte; |
2e567bd3 | 1444 | const unsigned char *str; |
82d497fc | 1445 | int len; |
a1bc88d4 | 1446 | Lisp_Object iso_classes; |
195d1361 | 1447 | |
b7826503 | 1448 | CHECK_STRING (string); |
a1bc88d4 | 1449 | iso_classes = Qnil; |
82d497fc | 1450 | |
195d1361 RS |
1451 | if (NILP (lim)) |
1452 | XSETINT (lim, forwardp ? ZV : BEGV); | |
1453 | else | |
b7826503 | 1454 | CHECK_NUMBER_COERCE_MARKER (lim); |
195d1361 RS |
1455 | |
1456 | /* In any case, don't allow scan outside bounds of buffer. */ | |
195d1361 RS |
1457 | if (XINT (lim) > ZV) |
1458 | XSETFASTINT (lim, ZV); | |
1459 | if (XINT (lim) < BEGV) | |
1460 | XSETFASTINT (lim, BEGV); | |
1461 | ||
4b4deea2 | 1462 | multibyte = (!NILP (BVAR (current_buffer, enable_multibyte_characters)) |
92eaa22e | 1463 | && (XINT (lim) - PT != CHAR_TO_BYTE (XINT (lim)) - PT_BYTE)); |
8f924df7 | 1464 | string_multibyte = SBYTES (string) > SCHARS (string); |
b7dbcc19 | 1465 | |
72af86bd | 1466 | memset (fastmap, 0, sizeof fastmap); |
195d1361 | 1467 | |
8f924df7 KH |
1468 | str = SDATA (string); |
1469 | size_byte = SBYTES (string); | |
4101e6fe | 1470 | |
82d497fc | 1471 | i_byte = 0; |
13090112 | 1472 | if (i_byte < size_byte |
d5db4077 | 1473 | && SREF (string, 0) == '^') |
195d1361 | 1474 | { |
82d497fc | 1475 | negate = 1; i_byte++; |
195d1361 RS |
1476 | } |
1477 | ||
1478 | /* Find the characters specified and set their elements of fastmap. | |
b7dbcc19 | 1479 | Handle backslashes and ranges specially. |
195d1361 | 1480 | |
b7dbcc19 KH |
1481 | If STRING contains non-ASCII characters, setup char_ranges for |
1482 | them and use fastmap only for their leading codes. */ | |
4101e6fe | 1483 | |
b7dbcc19 | 1484 | if (! string_multibyte) |
195d1361 | 1485 | { |
b7dbcc19 | 1486 | int string_has_eight_bit = 0; |
4101e6fe | 1487 | |
b7dbcc19 KH |
1488 | /* At first setup fastmap. */ |
1489 | while (i_byte < size_byte) | |
1490 | { | |
1491 | c = str[i_byte++]; | |
1492 | ||
a1bc88d4 RS |
1493 | if (handle_iso_classes && c == '[' |
1494 | && i_byte < size_byte | |
327719ee | 1495 | && str[i_byte] == ':') |
a1bc88d4 RS |
1496 | { |
1497 | const unsigned char *class_beg = str + i_byte + 1; | |
1498 | const unsigned char *class_end = class_beg; | |
b3bda4fd | 1499 | const unsigned char *class_limit = str + size_byte - 2; |
db9cd97a | 1500 | /* Leave room for the null. */ |
a1bc88d4 RS |
1501 | unsigned char class_name[CHAR_CLASS_MAX_LENGTH + 1]; |
1502 | re_wctype_t cc; | |
1503 | ||
1504 | if (class_limit - class_beg > CHAR_CLASS_MAX_LENGTH) | |
1505 | class_limit = class_beg + CHAR_CLASS_MAX_LENGTH; | |
1506 | ||
b3bda4fd KS |
1507 | while (class_end < class_limit |
1508 | && *class_end >= 'a' && *class_end <= 'z') | |
a1bc88d4 RS |
1509 | class_end++; |
1510 | ||
b3bda4fd KS |
1511 | if (class_end == class_beg |
1512 | || *class_end != ':' || class_end[1] != ']') | |
1513 | goto not_a_class_name; | |
a1bc88d4 | 1514 | |
72af86bd | 1515 | memcpy (class_name, class_beg, class_end - class_beg); |
a1bc88d4 RS |
1516 | class_name[class_end - class_beg] = 0; |
1517 | ||
1518 | cc = re_wctype (class_name); | |
1519 | if (cc == 0) | |
1520 | error ("Invalid ISO C character class"); | |
1521 | ||
1522 | iso_classes = Fcons (make_number (cc), iso_classes); | |
1523 | ||
1524 | i_byte = class_end + 2 - str; | |
1525 | continue; | |
1526 | } | |
1527 | ||
b3bda4fd | 1528 | not_a_class_name: |
b7dbcc19 KH |
1529 | if (c == '\\') |
1530 | { | |
13090112 | 1531 | if (i_byte == size_byte) |
4101e6fe RS |
1532 | break; |
1533 | ||
5c7b02ab | 1534 | c = str[i_byte++]; |
195d1361 | 1535 | } |
839966f3 KH |
1536 | /* Treat `-' as range character only if another character |
1537 | follows. */ | |
1538 | if (i_byte + 1 < size_byte | |
82d497fc | 1539 | && str[i_byte] == '-') |
195d1361 | 1540 | { |
9690d026 | 1541 | unsigned int c2; |
4101e6fe RS |
1542 | |
1543 | /* Skip over the dash. */ | |
82d497fc | 1544 | i_byte++; |
4101e6fe | 1545 | |
4101e6fe | 1546 | /* Get the end of the range. */ |
5c7b02ab | 1547 | c2 = str[i_byte++]; |
b7dbcc19 KH |
1548 | if (c2 == '\\' |
1549 | && i_byte < size_byte) | |
1550 | c2 = str[i_byte++]; | |
1551 | ||
8f924df7 KH |
1552 | if (c <= c2) |
1553 | { | |
1e69125e PE |
1554 | unsigned lim2 = c2 + 1; |
1555 | while (c < lim2) | |
8f924df7 KH |
1556 | fastmap[c++] = 1; |
1557 | if (! ASCII_CHAR_P (c2)) | |
1558 | string_has_eight_bit = 1; | |
1559 | } | |
195d1361 RS |
1560 | } |
1561 | else | |
b7dbcc19 KH |
1562 | { |
1563 | fastmap[c] = 1; | |
1564 | if (! ASCII_CHAR_P (c)) | |
1565 | string_has_eight_bit = 1; | |
1566 | } | |
1567 | } | |
1568 | ||
1569 | /* If the current range is multibyte and STRING contains | |
1570 | eight-bit chars, arrange fastmap and setup char_ranges for | |
1571 | the corresponding multibyte chars. */ | |
1572 | if (multibyte && string_has_eight_bit) | |
1573 | { | |
1574 | unsigned char fastmap2[0400]; | |
1575 | int range_start_byte, range_start_char; | |
1576 | ||
72af86bd AS |
1577 | memcpy (fastmap + 0200, fastmap2 + 0200, 0200); |
1578 | memset (fastmap + 0200, 0, 0200); | |
b7dbcc19 KH |
1579 | /* We are sure that this loop stops. */ |
1580 | for (i = 0200; ! fastmap2[i]; i++); | |
4c0354d7 | 1581 | c = BYTE8_TO_CHAR (i); |
b7dbcc19 KH |
1582 | fastmap[CHAR_LEADING_CODE (c)] = 1; |
1583 | range_start_byte = i; | |
1584 | range_start_char = c; | |
f003ca54 | 1585 | char_ranges = (int *) alloca (sizeof (int) * 128 * 2); |
b7dbcc19 KH |
1586 | for (i = 129; i < 0400; i++) |
1587 | { | |
4c0354d7 | 1588 | c = BYTE8_TO_CHAR (i); |
b7dbcc19 KH |
1589 | fastmap[CHAR_LEADING_CODE (c)] = 1; |
1590 | if (i - range_start_byte != c - range_start_char) | |
1591 | { | |
1592 | char_ranges[n_char_ranges++] = range_start_char; | |
1593 | char_ranges[n_char_ranges++] = ((i - 1 - range_start_byte) | |
1594 | + range_start_char); | |
1595 | range_start_byte = i; | |
1596 | range_start_char = c; | |
8f924df7 | 1597 | } |
b7dbcc19 KH |
1598 | } |
1599 | char_ranges[n_char_ranges++] = range_start_char; | |
1600 | char_ranges[n_char_ranges++] = ((i - 1 - range_start_byte) | |
1601 | + range_start_char); | |
195d1361 RS |
1602 | } |
1603 | } | |
f003ca54 | 1604 | else /* STRING is multibyte */ |
b7dbcc19 | 1605 | { |
f003ca54 KH |
1606 | char_ranges = (int *) alloca (sizeof (int) * SCHARS (string) * 2); |
1607 | ||
b7dbcc19 | 1608 | while (i_byte < size_byte) |
195d1361 | 1609 | { |
b7dbcc19 | 1610 | unsigned char leading_code; |
5c7b02ab | 1611 | |
b7dbcc19 | 1612 | leading_code = str[i_byte]; |
62a6e103 | 1613 | c = STRING_CHAR_AND_LENGTH (str + i_byte, len); |
b7dbcc19 | 1614 | i_byte += len; |
5c7b02ab | 1615 | |
327719ee MB |
1616 | if (handle_iso_classes && c == '[' |
1617 | && i_byte < size_byte | |
62a6e103 | 1618 | && STRING_CHAR (str + i_byte) == ':') |
327719ee MB |
1619 | { |
1620 | const unsigned char *class_beg = str + i_byte + 1; | |
1621 | const unsigned char *class_end = class_beg; | |
1622 | const unsigned char *class_limit = str + size_byte - 2; | |
1623 | /* Leave room for the null. */ | |
1624 | unsigned char class_name[CHAR_CLASS_MAX_LENGTH + 1]; | |
1625 | re_wctype_t cc; | |
1626 | ||
1627 | if (class_limit - class_beg > CHAR_CLASS_MAX_LENGTH) | |
1628 | class_limit = class_beg + CHAR_CLASS_MAX_LENGTH; | |
1629 | ||
1630 | while (class_end < class_limit | |
1631 | && *class_end >= 'a' && *class_end <= 'z') | |
1632 | class_end++; | |
1633 | ||
1634 | if (class_end == class_beg | |
1635 | || *class_end != ':' || class_end[1] != ']') | |
1636 | goto not_a_class_name_multibyte; | |
1637 | ||
72af86bd | 1638 | memcpy (class_name, class_beg, class_end - class_beg); |
327719ee MB |
1639 | class_name[class_end - class_beg] = 0; |
1640 | ||
1641 | cc = re_wctype (class_name); | |
1642 | if (cc == 0) | |
1643 | error ("Invalid ISO C character class"); | |
1644 | ||
1645 | iso_classes = Fcons (make_number (cc), iso_classes); | |
1646 | ||
1647 | i_byte = class_end + 2 - str; | |
1648 | continue; | |
1649 | } | |
1650 | ||
1651 | not_a_class_name_multibyte: | |
195d1361 RS |
1652 | if (c == '\\') |
1653 | { | |
13090112 | 1654 | if (i_byte == size_byte) |
4101e6fe RS |
1655 | break; |
1656 | ||
b7dbcc19 | 1657 | leading_code = str[i_byte]; |
62a6e103 | 1658 | c = STRING_CHAR_AND_LENGTH (str + i_byte, len); |
82d497fc | 1659 | i_byte += len; |
195d1361 | 1660 | } |
839966f3 KH |
1661 | /* Treat `-' as range character only if another character |
1662 | follows. */ | |
1663 | if (i_byte + 1 < size_byte | |
82d497fc | 1664 | && str[i_byte] == '-') |
195d1361 | 1665 | { |
9690d026 | 1666 | unsigned int c2; |
b7dbcc19 | 1667 | unsigned char leading_code2; |
4101e6fe RS |
1668 | |
1669 | /* Skip over the dash. */ | |
82d497fc | 1670 | i_byte++; |
4101e6fe | 1671 | |
4101e6fe | 1672 | /* Get the end of the range. */ |
b7dbcc19 | 1673 | leading_code2 = str[i_byte]; |
62a6e103 | 1674 | c2 = STRING_CHAR_AND_LENGTH (str + i_byte, len); |
82d497fc | 1675 | i_byte += len; |
7e68b0ea | 1676 | |
b7dbcc19 KH |
1677 | if (c2 == '\\' |
1678 | && i_byte < size_byte) | |
1679 | { | |
1680 | leading_code2 = str[i_byte]; | |
62a6e103 | 1681 | c2 =STRING_CHAR_AND_LENGTH (str + i_byte, len); |
b7dbcc19 KH |
1682 | i_byte += len; |
1683 | } | |
1684 | ||
f003ca54 KH |
1685 | if (c > c2) |
1686 | continue; | |
b7dbcc19 | 1687 | if (ASCII_CHAR_P (c)) |
06274af5 | 1688 | { |
5c7b02ab KH |
1689 | while (c <= c2 && c < 0x80) |
1690 | fastmap[c++] = 1; | |
b7dbcc19 KH |
1691 | leading_code = CHAR_LEADING_CODE (c); |
1692 | } | |
1693 | if (! ASCII_CHAR_P (c)) | |
1694 | { | |
1e69125e PE |
1695 | unsigned lim2 = leading_code2 + 1; |
1696 | while (leading_code < lim2) | |
b7dbcc19 KH |
1697 | fastmap[leading_code++] = 1; |
1698 | if (c <= c2) | |
e39091b6 | 1699 | { |
b7dbcc19 | 1700 | char_ranges[n_char_ranges++] = c; |
e39091b6 | 1701 | char_ranges[n_char_ranges++] = c2; |
06274af5 KH |
1702 | } |
1703 | } | |
195d1361 RS |
1704 | } |
1705 | else | |
7e68b0ea | 1706 | { |
b7dbcc19 | 1707 | if (ASCII_CHAR_P (c)) |
e39091b6 KH |
1708 | fastmap[c] = 1; |
1709 | else | |
7e68b0ea | 1710 | { |
b7dbcc19 | 1711 | fastmap[leading_code] = 1; |
4101e6fe RS |
1712 | char_ranges[n_char_ranges++] = c; |
1713 | char_ranges[n_char_ranges++] = c; | |
7e68b0ea RS |
1714 | } |
1715 | } | |
195d1361 | 1716 | } |
b7dbcc19 KH |
1717 | |
1718 | /* If the current range is unibyte and STRING contains non-ASCII | |
1719 | chars, arrange fastmap for the corresponding unibyte | |
1720 | chars. */ | |
1721 | ||
1722 | if (! multibyte && n_char_ranges > 0) | |
1723 | { | |
72af86bd | 1724 | memset (fastmap + 0200, 0, 0200); |
b7dbcc19 KH |
1725 | for (i = 0; i < n_char_ranges; i += 2) |
1726 | { | |
1727 | int c1 = char_ranges[i]; | |
1e69125e | 1728 | unsigned lim2 = char_ranges[i + 1] + 1; |
b7dbcc19 | 1729 | |
1e69125e | 1730 | for (; c1 < lim2; c1++) |
2afc21f5 SM |
1731 | { |
1732 | int b = CHAR_TO_BYTE_SAFE (c1); | |
1733 | if (b >= 0) | |
1734 | fastmap[b] = 1; | |
1735 | } | |
b7dbcc19 KH |
1736 | } |
1737 | } | |
195d1361 RS |
1738 | } |
1739 | ||
9690d026 | 1740 | /* If ^ was the first character, complement the fastmap. */ |
195d1361 | 1741 | if (negate) |
b7dbcc19 KH |
1742 | { |
1743 | if (! multibyte) | |
1744 | for (i = 0; i < sizeof fastmap; i++) | |
1745 | fastmap[i] ^= 1; | |
1746 | else | |
1747 | { | |
1748 | for (i = 0; i < 0200; i++) | |
1749 | fastmap[i] ^= 1; | |
1750 | /* All non-ASCII chars possibly match. */ | |
1751 | for (; i < sizeof fastmap; i++) | |
1752 | fastmap[i] = 1; | |
1753 | } | |
1754 | } | |
195d1361 RS |
1755 | |
1756 | { | |
d311d28c PE |
1757 | ptrdiff_t start_point = PT; |
1758 | ptrdiff_t pos = PT; | |
1759 | ptrdiff_t pos_byte = PT_BYTE; | |
9af7511a KH |
1760 | unsigned char *p = PT_ADDR, *endp, *stop; |
1761 | ||
1762 | if (forwardp) | |
1763 | { | |
1764 | endp = (XINT (lim) == GPT) ? GPT_ADDR : CHAR_POS_ADDR (XINT (lim)); | |
d7ee9fab | 1765 | stop = (pos < GPT && GPT < XINT (lim)) ? GPT_ADDR : endp; |
9af7511a KH |
1766 | } |
1767 | else | |
1768 | { | |
1769 | endp = CHAR_POS_ADDR (XINT (lim)); | |
d7ee9fab | 1770 | stop = (pos >= GPT && GPT > XINT (lim)) ? GAP_END_ADDR : endp; |
9af7511a | 1771 | } |
195d1361 RS |
1772 | |
1773 | immediate_quit = 1; | |
618db430 SM |
1774 | /* This code may look up syntax tables using macros that rely on the |
1775 | gl_state object. To make sure this object is not out of date, | |
1776 | let's initialize it manually. | |
1777 | We ignore syntax-table text-properties for now, since that's | |
1778 | what we've done in the past. */ | |
d48cd3f4 | 1779 | SETUP_BUFFER_SYNTAX_TABLE (); |
b7dbcc19 | 1780 | if (forwardp) |
195d1361 | 1781 | { |
b7dbcc19 | 1782 | if (multibyte) |
8f924df7 | 1783 | while (1) |
b7dbcc19 | 1784 | { |
8f924df7 | 1785 | int nbytes; |
9af7511a | 1786 | |
8f924df7 | 1787 | if (p >= stop) |
9af7511a | 1788 | { |
8f924df7 | 1789 | if (p >= endp) |
9af7511a | 1790 | break; |
8f924df7 KH |
1791 | p = GAP_END_ADDR; |
1792 | stop = endp; | |
9af7511a | 1793 | } |
62a6e103 | 1794 | c = STRING_CHAR_AND_LENGTH (p, nbytes); |
327719ee | 1795 | if (! NILP (iso_classes) && in_classes (c, iso_classes)) |
9af7511a | 1796 | { |
327719ee | 1797 | if (negate) |
9af7511a | 1798 | break; |
327719ee MB |
1799 | else |
1800 | goto fwd_ok; | |
9af7511a | 1801 | } |
9af7511a | 1802 | |
8f924df7 | 1803 | if (! fastmap[*p]) |
b7dbcc19 KH |
1804 | break; |
1805 | if (! ASCII_CHAR_P (c)) | |
9af7511a | 1806 | { |
b7dbcc19 KH |
1807 | /* As we are looking at a multibyte character, we |
1808 | must look up the character in the table | |
1809 | CHAR_RANGES. If there's no data in the table, | |
1810 | that character is not what we want to skip. */ | |
1811 | ||
1812 | /* The following code do the right thing even if | |
1813 | n_char_ranges is zero (i.e. no data in | |
1814 | CHAR_RANGES). */ | |
1815 | for (i = 0; i < n_char_ranges; i += 2) | |
1816 | if (c >= char_ranges[i] && c <= char_ranges[i + 1]) | |
9af7511a | 1817 | break; |
b7dbcc19 KH |
1818 | if (!(negate ^ (i < n_char_ranges))) |
1819 | break; | |
9af7511a | 1820 | } |
327719ee | 1821 | fwd_ok: |
8f924df7 | 1822 | p += nbytes, pos++, pos_byte += nbytes; |
b7dbcc19 KH |
1823 | } |
1824 | else | |
8f924df7 KH |
1825 | while (1) |
1826 | { | |
1827 | if (p >= stop) | |
9af7511a | 1828 | { |
8f924df7 | 1829 | if (p >= endp) |
9af7511a | 1830 | break; |
8f924df7 KH |
1831 | p = GAP_END_ADDR; |
1832 | stop = endp; | |
9af7511a | 1833 | } |
327719ee MB |
1834 | |
1835 | if (!NILP (iso_classes) && in_classes (*p, iso_classes)) | |
1836 | { | |
1837 | if (negate) | |
1838 | break; | |
1839 | else | |
1840 | goto fwd_unibyte_ok; | |
1841 | } | |
1842 | ||
8f924df7 KH |
1843 | if (!fastmap[*p]) |
1844 | break; | |
327719ee | 1845 | fwd_unibyte_ok: |
8f924df7 KH |
1846 | p++, pos++, pos_byte++; |
1847 | } | |
195d1361 RS |
1848 | } |
1849 | else | |
1850 | { | |
b7dbcc19 | 1851 | if (multibyte) |
8f924df7 | 1852 | while (1) |
b7dbcc19 | 1853 | { |
8f924df7 | 1854 | unsigned char *prev_p; |
9af7511a | 1855 | |
8f924df7 | 1856 | if (p <= stop) |
9af7511a | 1857 | { |
8f924df7 | 1858 | if (p <= endp) |
9af7511a | 1859 | break; |
8f924df7 KH |
1860 | p = GPT_ADDR; |
1861 | stop = endp; | |
9af7511a | 1862 | } |
8f924df7 KH |
1863 | prev_p = p; |
1864 | while (--p >= stop && ! CHAR_HEAD_P (*p)); | |
62a6e103 | 1865 | c = STRING_CHAR (p); |
a1bc88d4 | 1866 | |
327719ee MB |
1867 | if (! NILP (iso_classes) && in_classes (c, iso_classes)) |
1868 | { | |
1869 | if (negate) | |
1870 | break; | |
9690d026 | 1871 | else |
327719ee | 1872 | goto back_ok; |
7e68b0ea | 1873 | } |
a1bc88d4 | 1874 | |
8f924df7 | 1875 | if (! fastmap[*p]) |
b7dbcc19 KH |
1876 | break; |
1877 | if (! ASCII_CHAR_P (c)) | |
7e68b0ea | 1878 | { |
b7dbcc19 KH |
1879 | /* See the comment in the previous similar code. */ |
1880 | for (i = 0; i < n_char_ranges; i += 2) | |
1881 | if (c >= char_ranges[i] && c <= char_ranges[i + 1]) | |
1882 | break; | |
1883 | if (!(negate ^ (i < n_char_ranges))) | |
1884 | break; | |
7e68b0ea | 1885 | } |
327719ee | 1886 | back_ok: |
8f924df7 | 1887 | pos--, pos_byte -= prev_p - p; |
b7dbcc19 KH |
1888 | } |
1889 | else | |
8f924df7 KH |
1890 | while (1) |
1891 | { | |
1892 | if (p <= stop) | |
9af7511a | 1893 | { |
8f924df7 | 1894 | if (p <= endp) |
9af7511a | 1895 | break; |
8f924df7 KH |
1896 | p = GPT_ADDR; |
1897 | stop = endp; | |
9af7511a | 1898 | } |
e39091b6 | 1899 | |
327719ee MB |
1900 | if (! NILP (iso_classes) && in_classes (p[-1], iso_classes)) |
1901 | { | |
1902 | if (negate) | |
1903 | break; | |
9af7511a | 1904 | else |
327719ee MB |
1905 | goto back_unibyte_ok; |
1906 | } | |
a1bc88d4 | 1907 | |
8f924df7 KH |
1908 | if (!fastmap[p[-1]]) |
1909 | break; | |
327719ee | 1910 | back_unibyte_ok: |
8f924df7 KH |
1911 | p--, pos--, pos_byte--; |
1912 | } | |
195d1361 | 1913 | } |
7e68b0ea | 1914 | |
b7dbcc19 KH |
1915 | SET_PT_BOTH (pos, pos_byte); |
1916 | immediate_quit = 0; | |
1917 | ||
1918 | return make_number (PT - start_point); | |
1919 | } | |
1920 | } | |
7e68b0ea | 1921 | |
b7dbcc19 KH |
1922 | |
1923 | static Lisp_Object | |
971de7fb | 1924 | skip_syntaxes (int forwardp, Lisp_Object string, Lisp_Object lim) |
b7dbcc19 KH |
1925 | { |
1926 | register unsigned int c; | |
1927 | unsigned char fastmap[0400]; | |
1928 | int negate = 0; | |
d311d28c | 1929 | register ptrdiff_t i, i_byte; |
b7dbcc19 | 1930 | int multibyte; |
d311d28c | 1931 | ptrdiff_t size_byte; |
b7dbcc19 KH |
1932 | unsigned char *str; |
1933 | ||
1934 | CHECK_STRING (string); | |
1935 | ||
1936 | if (NILP (lim)) | |
1937 | XSETINT (lim, forwardp ? ZV : BEGV); | |
1938 | else | |
1939 | CHECK_NUMBER_COERCE_MARKER (lim); | |
1940 | ||
1941 | /* In any case, don't allow scan outside bounds of buffer. */ | |
1942 | if (XINT (lim) > ZV) | |
1943 | XSETFASTINT (lim, ZV); | |
1944 | if (XINT (lim) < BEGV) | |
1945 | XSETFASTINT (lim, BEGV); | |
1946 | ||
ade8ee9e | 1947 | if (forwardp ? (PT >= XFASTINT (lim)) : (PT <= XFASTINT (lim))) |
49feb1cd | 1948 | return make_number (0); |
8c6e735b | 1949 | |
4b4deea2 | 1950 | multibyte = (!NILP (BVAR (current_buffer, enable_multibyte_characters)) |
92eaa22e | 1951 | && (XINT (lim) - PT != CHAR_TO_BYTE (XINT (lim)) - PT_BYTE)); |
b7dbcc19 | 1952 | |
72af86bd | 1953 | memset (fastmap, 0, sizeof fastmap); |
b7dbcc19 | 1954 | |
8f924df7 KH |
1955 | if (SBYTES (string) > SCHARS (string)) |
1956 | /* As this is very rare case (syntax spec is ASCII only), don't | |
1957 | consider efficiency. */ | |
bc796a59 KH |
1958 | string = string_make_unibyte (string); |
1959 | ||
8f924df7 KH |
1960 | str = SDATA (string); |
1961 | size_byte = SBYTES (string); | |
bc796a59 | 1962 | |
b7dbcc19 KH |
1963 | i_byte = 0; |
1964 | if (i_byte < size_byte | |
8f924df7 | 1965 | && SREF (string, 0) == '^') |
b7dbcc19 KH |
1966 | { |
1967 | negate = 1; i_byte++; | |
1968 | } | |
1969 | ||
b7dbcc19 KH |
1970 | /* Find the syntaxes specified and set their elements of fastmap. */ |
1971 | ||
1972 | while (i_byte < size_byte) | |
1973 | { | |
1974 | c = str[i_byte++]; | |
8f924df7 | 1975 | fastmap[syntax_spec_code[c]] = 1; |
b7dbcc19 | 1976 | } |
195d1361 | 1977 | |
9690d026 | 1978 | /* If ^ was the first character, complement the fastmap. */ |
195d1361 RS |
1979 | if (negate) |
1980 | for (i = 0; i < sizeof fastmap; i++) | |
9690d026 | 1981 | fastmap[i] ^= 1; |
195d1361 RS |
1982 | |
1983 | { | |
d311d28c PE |
1984 | ptrdiff_t start_point = PT; |
1985 | ptrdiff_t pos = PT; | |
1986 | ptrdiff_t pos_byte = PT_BYTE; | |
8f924df7 KH |
1987 | unsigned char *p = PT_ADDR, *endp, *stop; |
1988 | ||
1989 | if (forwardp) | |
1990 | { | |
1991 | endp = (XINT (lim) == GPT) ? GPT_ADDR : CHAR_POS_ADDR (XINT (lim)); | |
1992 | stop = (pos < GPT && GPT < XINT (lim)) ? GPT_ADDR : endp; | |
1993 | } | |
1994 | else | |
1995 | { | |
1996 | endp = CHAR_POS_ADDR (XINT (lim)); | |
1997 | stop = (pos >= GPT && GPT > XINT (lim)) ? GAP_END_ADDR : endp; | |
1998 | } | |
195d1361 RS |
1999 | |
2000 | immediate_quit = 1; | |
b7dbcc19 KH |
2001 | SETUP_SYNTAX_TABLE (pos, forwardp ? 1 : -1); |
2002 | if (forwardp) | |
195d1361 | 2003 | { |
b7dbcc19 | 2004 | if (multibyte) |
195d1361 | 2005 | { |
8f924df7 | 2006 | while (1) |
8c6e735b | 2007 | { |
8f924df7 KH |
2008 | int nbytes; |
2009 | ||
2010 | if (p >= stop) | |
2011 | { | |
2012 | if (p >= endp) | |
2013 | break; | |
2014 | p = GAP_END_ADDR; | |
2015 | stop = endp; | |
2016 | } | |
62a6e103 | 2017 | c = STRING_CHAR_AND_LENGTH (p, nbytes); |
8f924df7 | 2018 | if (! fastmap[(int) SYNTAX (c)]) |
8c6e735b | 2019 | break; |
8f924df7 | 2020 | p += nbytes, pos++, pos_byte += nbytes; |
8c6e735b KH |
2021 | UPDATE_SYNTAX_TABLE_FORWARD (pos); |
2022 | } | |
195d1361 RS |
2023 | } |
2024 | else | |
2025 | { | |
8c6e735b | 2026 | while (1) |
7e68b0ea | 2027 | { |
8f924df7 KH |
2028 | if (p >= stop) |
2029 | { | |
2030 | if (p >= endp) | |
2031 | break; | |
2032 | p = GAP_END_ADDR; | |
2033 | stop = endp; | |
2034 | } | |
2035 | if (! fastmap[(int) SYNTAX (*p)]) | |
8c6e735b | 2036 | break; |
8f924df7 | 2037 | p++, pos++, pos_byte++; |
b7dbcc19 | 2038 | UPDATE_SYNTAX_TABLE_FORWARD (pos); |
195d1361 RS |
2039 | } |
2040 | } | |
2041 | } | |
2042 | else | |
2043 | { | |
b7dbcc19 | 2044 | if (multibyte) |
195d1361 | 2045 | { |
8c6e735b | 2046 | while (1) |
b7dbcc19 | 2047 | { |
8f924df7 KH |
2048 | unsigned char *prev_p; |
2049 | ||
2050 | if (p <= stop) | |
b7dbcc19 | 2051 | { |
8f924df7 KH |
2052 | if (p <= endp) |
2053 | break; | |
2054 | p = GPT_ADDR; | |
2055 | stop = endp; | |
b7dbcc19 | 2056 | } |
262be72a | 2057 | UPDATE_SYNTAX_TABLE_BACKWARD (pos - 1); |
8f924df7 KH |
2058 | prev_p = p; |
2059 | while (--p >= stop && ! CHAR_HEAD_P (*p)); | |
62a6e103 | 2060 | c = STRING_CHAR (p); |
8f924df7 KH |
2061 | if (! fastmap[(int) SYNTAX (c)]) |
2062 | break; | |
2063 | pos--, pos_byte -= prev_p - p; | |
b7dbcc19 | 2064 | } |
195d1361 RS |
2065 | } |
2066 | else | |
2067 | { | |
8c6e735b KH |
2068 | while (1) |
2069 | { | |
8f924df7 KH |
2070 | if (p <= stop) |
2071 | { | |
2072 | if (p <= endp) | |
2073 | break; | |
2074 | p = GPT_ADDR; | |
2075 | stop = endp; | |
2076 | } | |
102f6132 | 2077 | UPDATE_SYNTAX_TABLE_BACKWARD (pos - 1); |
8f924df7 | 2078 | if (! fastmap[(int) SYNTAX (p[-1])]) |
8c6e735b | 2079 | break; |
8f924df7 | 2080 | p--, pos--, pos_byte--; |
8c6e735b | 2081 | } |
195d1361 RS |
2082 | } |
2083 | } | |
6a140a74 RS |
2084 | |
2085 | SET_PT_BOTH (pos, pos_byte); | |
195d1361 RS |
2086 | immediate_quit = 0; |
2087 | ||
2088 | return make_number (PT - start_point); | |
2089 | } | |
2090 | } | |
a1bc88d4 RS |
2091 | |
2092 | /* Return 1 if character C belongs to one of the ISO classes | |
2093 | in the list ISO_CLASSES. Each class is represented by an | |
2094 | integer which is its type according to re_wctype. */ | |
2095 | ||
2096 | static int | |
971de7fb | 2097 | in_classes (int c, Lisp_Object iso_classes) |
a1bc88d4 RS |
2098 | { |
2099 | int fits_class = 0; | |
2100 | ||
618db430 | 2101 | while (CONSP (iso_classes)) |
a1bc88d4 RS |
2102 | { |
2103 | Lisp_Object elt; | |
2104 | elt = XCAR (iso_classes); | |
2105 | iso_classes = XCDR (iso_classes); | |
2106 | ||
2107 | if (re_iswctype (c, XFASTINT (elt))) | |
2108 | fits_class = 1; | |
2109 | } | |
2110 | ||
2111 | return fits_class; | |
2112 | } | |
195d1361 | 2113 | \f |
95ff8dfc RS |
2114 | /* Jump over a comment, assuming we are at the beginning of one. |
2115 | FROM is the current position. | |
2116 | FROM_BYTE is the bytepos corresponding to FROM. | |
2117 | Do not move past STOP (a charpos). | |
2118 | The comment over which we have to jump is of style STYLE | |
c5683ceb | 2119 | (either SYNTAX_FLAGS_COMMENT_STYLE(foo) or ST_COMMENT_STYLE). |
95ff8dfc RS |
2120 | NESTING should be positive to indicate the nesting at the beginning |
2121 | for nested comments and should be zero or negative else. | |
2122 | ST_COMMENT_STYLE cannot be nested. | |
2123 | PREV_SYNTAX is the SYNTAX_WITH_FLAGS of the previous character | |
2124 | (or 0 If the search cannot start in the middle of a two-character). | |
2125 | ||
2126 | If successful, return 1 and store the charpos of the comment's end | |
2127 | into *CHARPOS_PTR and the corresponding bytepos into *BYTEPOS_PTR. | |
2128 | Else, return 0 and store the charpos STOP into *CHARPOS_PTR, the | |
2129 | corresponding bytepos into *BYTEPOS_PTR and the current nesting | |
2130 | (as defined for state.incomment) in *INCOMMENT_PTR. | |
2131 | ||
2132 | The comment end is the last character of the comment rather than the | |
2133 | character just after the comment. | |
2134 | ||
2135 | Global syntax data is assumed to initially be valid for FROM and | |
2136 | remains valid for forward search starting at the returned position. */ | |
2137 | ||
2138 | static int | |
d311d28c PE |
2139 | forw_comment (ptrdiff_t from, ptrdiff_t from_byte, ptrdiff_t stop, |
2140 | EMACS_INT nesting, int style, int prev_syntax, | |
2141 | ptrdiff_t *charpos_ptr, ptrdiff_t *bytepos_ptr, | |
2142 | EMACS_INT *incomment_ptr) | |
95ff8dfc RS |
2143 | { |
2144 | register int c, c1; | |
2145 | register enum syntaxcode code; | |
c5683ceb | 2146 | register int syntax, other_syntax; |
95ff8dfc RS |
2147 | |
2148 | if (nesting <= 0) nesting = -1; | |
2149 | ||
2150 | /* Enter the loop in the middle so that we find | |
2151 | a 2-char comment ender if we start in the middle of it. */ | |
2152 | syntax = prev_syntax; | |
2153 | if (syntax != 0) goto forw_incomment; | |
2154 | ||
2155 | while (1) | |
2156 | { | |
2157 | if (from == stop) | |
2158 | { | |
2159 | *incomment_ptr = nesting; | |
2160 | *charpos_ptr = from; | |
2161 | *bytepos_ptr = from_byte; | |
2162 | return 0; | |
2163 | } | |
8f924df7 | 2164 | c = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
95ff8dfc RS |
2165 | syntax = SYNTAX_WITH_FLAGS (c); |
2166 | code = syntax & 0xff; | |
2167 | if (code == Sendcomment | |
c5683ceb | 2168 | && SYNTAX_FLAGS_COMMENT_STYLE (syntax, 0) == style |
abf8a9ff SM |
2169 | && (SYNTAX_FLAGS_COMMENT_NESTED (syntax) ? |
2170 | (nesting > 0 && --nesting == 0) : nesting < 0)) | |
95ff8dfc RS |
2171 | /* we have encountered a comment end of the same style |
2172 | as the comment sequence which began this comment | |
2173 | section */ | |
2174 | break; | |
2175 | if (code == Scomment_fence | |
2176 | && style == ST_COMMENT_STYLE) | |
2177 | /* we have encountered a comment end of the same style | |
2178 | as the comment sequence which began this comment | |
2179 | section. */ | |
2180 | break; | |
2181 | if (nesting > 0 | |
2182 | && code == Scomment | |
abf8a9ff | 2183 | && SYNTAX_FLAGS_COMMENT_NESTED (syntax) |
c5683ceb | 2184 | && SYNTAX_FLAGS_COMMENT_STYLE (syntax, 0) == style) |
95ff8dfc RS |
2185 | /* we have encountered a nested comment of the same style |
2186 | as the comment sequence which began this comment section */ | |
2187 | nesting++; | |
2188 | INC_BOTH (from, from_byte); | |
2189 | UPDATE_SYNTAX_TABLE_FORWARD (from); | |
7d0393cf | 2190 | |
95ff8dfc RS |
2191 | forw_incomment: |
2192 | if (from < stop && SYNTAX_FLAGS_COMEND_FIRST (syntax) | |
8f924df7 | 2193 | && (c1 = FETCH_CHAR_AS_MULTIBYTE (from_byte), |
c5683ceb SM |
2194 | other_syntax = SYNTAX_WITH_FLAGS (c1), |
2195 | SYNTAX_FLAGS_COMEND_SECOND (other_syntax)) | |
2196 | && SYNTAX_FLAGS_COMMENT_STYLE (syntax, other_syntax) == style | |
abf8a9ff | 2197 | && ((SYNTAX_FLAGS_COMMENT_NESTED (syntax) || |
c5683ceb SM |
2198 | SYNTAX_FLAGS_COMMENT_NESTED (other_syntax)) |
2199 | ? nesting > 0 : nesting < 0)) | |
4ffe723b GM |
2200 | { |
2201 | if (--nesting <= 0) | |
2202 | /* we have encountered a comment end of the same style | |
2203 | as the comment sequence which began this comment | |
2204 | section */ | |
2205 | break; | |
2206 | else | |
2207 | { | |
2208 | INC_BOTH (from, from_byte); | |
2209 | UPDATE_SYNTAX_TABLE_FORWARD (from); | |
2210 | } | |
2211 | } | |
95ff8dfc RS |
2212 | if (nesting > 0 |
2213 | && from < stop | |
2214 | && SYNTAX_FLAGS_COMSTART_FIRST (syntax) | |
8f924df7 | 2215 | && (c1 = FETCH_CHAR_AS_MULTIBYTE (from_byte), |
c5683ceb SM |
2216 | other_syntax = SYNTAX_WITH_FLAGS (c1), |
2217 | SYNTAX_FLAGS_COMMENT_STYLE (other_syntax, syntax) == style | |
2218 | && SYNTAX_FLAGS_COMSTART_SECOND (other_syntax)) | |
abf8a9ff | 2219 | && (SYNTAX_FLAGS_COMMENT_NESTED (syntax) || |
c5683ceb | 2220 | SYNTAX_FLAGS_COMMENT_NESTED (other_syntax))) |
95ff8dfc RS |
2221 | /* we have encountered a nested comment of the same style |
2222 | as the comment sequence which began this comment | |
2223 | section */ | |
2224 | { | |
2225 | INC_BOTH (from, from_byte); | |
2226 | UPDATE_SYNTAX_TABLE_FORWARD (from); | |
2227 | nesting++; | |
2228 | } | |
2229 | } | |
2230 | *charpos_ptr = from; | |
2231 | *bytepos_ptr = from_byte; | |
2232 | return 1; | |
2233 | } | |
2234 | ||
b3cfe0c8 | 2235 | DEFUN ("forward-comment", Fforward_comment, Sforward_comment, 1, 1, 0, |
177c0ea7 | 2236 | doc: /* |
ee648c11 | 2237 | Move forward across up to COUNT comments. If COUNT is negative, move backward. |
fdb82f93 PJ |
2238 | Stop scanning if we find something other than a comment or whitespace. |
2239 | Set point to where scanning stops. | |
ee648c11 | 2240 | If COUNT comments are found as expected, with nothing except whitespace |
fdb82f93 | 2241 | between them, return t; otherwise return nil. */) |
5842a27b | 2242 | (Lisp_Object count) |
b3cfe0c8 | 2243 | { |
d311d28c PE |
2244 | register ptrdiff_t from; |
2245 | ptrdiff_t from_byte; | |
2246 | register ptrdiff_t stop; | |
8ea151b2 | 2247 | register int c, c1; |
b3cfe0c8 RS |
2248 | register enum syntaxcode code; |
2249 | int comstyle = 0; /* style of comment encountered */ | |
95ff8dfc | 2250 | int comnested = 0; /* whether the comment is nestable or not */ |
be720845 | 2251 | int found; |
2312c580 | 2252 | EMACS_INT count1; |
d311d28c | 2253 | ptrdiff_t out_charpos, out_bytepos; |
7c85f529 | 2254 | EMACS_INT dummy; |
840f481c | 2255 | |
b7826503 | 2256 | CHECK_NUMBER (count); |
840f481c | 2257 | count1 = XINT (count); |
195d1361 | 2258 | stop = count1 > 0 ? ZV : BEGV; |
b3cfe0c8 RS |
2259 | |
2260 | immediate_quit = 1; | |
2261 | QUIT; | |
2262 | ||
2263 | from = PT; | |
6a140a74 | 2264 | from_byte = PT_BYTE; |
b3cfe0c8 | 2265 | |
195d1361 | 2266 | SETUP_SYNTAX_TABLE (from, count1); |
840f481c | 2267 | while (count1 > 0) |
b3cfe0c8 | 2268 | { |
04882296 | 2269 | do |
b3cfe0c8 | 2270 | { |
c5683ceb | 2271 | int comstart_first, syntax, other_syntax; |
f902a008 | 2272 | |
04882296 KH |
2273 | if (from == stop) |
2274 | { | |
ef316cf0 | 2275 | SET_PT_BOTH (from, from_byte); |
b7e6e612 | 2276 | immediate_quit = 0; |
04882296 KH |
2277 | return Qnil; |
2278 | } | |
b7dbcc19 | 2279 | c = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
c5683ceb | 2280 | syntax = SYNTAX_WITH_FLAGS (c); |
b3cfe0c8 | 2281 | code = SYNTAX (c); |
c5683ceb SM |
2282 | comstart_first = SYNTAX_FLAGS_COMSTART_FIRST (syntax); |
2283 | comnested = SYNTAX_FLAGS_COMMENT_NESTED (syntax); | |
2284 | comstyle = SYNTAX_FLAGS_COMMENT_STYLE (syntax, 0); | |
6a140a74 | 2285 | INC_BOTH (from, from_byte); |
f902a008 | 2286 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
f902a008 | 2287 | if (from < stop && comstart_first |
b7dbcc19 | 2288 | && (c1 = FETCH_CHAR_AS_MULTIBYTE (from_byte), |
c5683ceb SM |
2289 | other_syntax = SYNTAX_WITH_FLAGS (c1), |
2290 | SYNTAX_FLAGS_COMSTART_SECOND (other_syntax))) | |
b3cfe0c8 | 2291 | { |
7d0393cf | 2292 | /* We have encountered a comment start sequence and we |
7fc8191e | 2293 | are ignoring all text inside comments. We must record |
b3cfe0c8 RS |
2294 | the comment style this sequence begins so that later, |
2295 | only a comment end of the same style actually ends | |
7fc8191e | 2296 | the comment section. */ |
b3cfe0c8 | 2297 | code = Scomment; |
c5683ceb SM |
2298 | comstyle = SYNTAX_FLAGS_COMMENT_STYLE (other_syntax, syntax); |
2299 | comnested | |
2300 | = comnested || SYNTAX_FLAGS_COMMENT_NESTED (other_syntax); | |
6a140a74 | 2301 | INC_BOTH (from, from_byte); |
95ff8dfc | 2302 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
b3cfe0c8 | 2303 | } |
04882296 | 2304 | } |
abf8a9ff | 2305 | while (code == Swhitespace || (code == Sendcomment && c == '\n')); |
6a140a74 | 2306 | |
da71ab91 KH |
2307 | if (code == Scomment_fence) |
2308 | comstyle = ST_COMMENT_STYLE; | |
2309 | else if (code != Scomment) | |
04882296 KH |
2310 | { |
2311 | immediate_quit = 0; | |
6a140a74 | 2312 | DEC_BOTH (from, from_byte); |
ef316cf0 | 2313 | SET_PT_BOTH (from, from_byte); |
04882296 KH |
2314 | return Qnil; |
2315 | } | |
2316 | /* We're at the start of a comment. */ | |
95ff8dfc RS |
2317 | found = forw_comment (from, from_byte, stop, comnested, comstyle, 0, |
2318 | &out_charpos, &out_bytepos, &dummy); | |
2319 | from = out_charpos; from_byte = out_bytepos; | |
2320 | if (!found) | |
04882296 | 2321 | { |
95ff8dfc RS |
2322 | immediate_quit = 0; |
2323 | SET_PT_BOTH (from, from_byte); | |
2324 | return Qnil; | |
b3cfe0c8 | 2325 | } |
95ff8dfc RS |
2326 | INC_BOTH (from, from_byte); |
2327 | UPDATE_SYNTAX_TABLE_FORWARD (from); | |
04882296 | 2328 | /* We have skipped one comment. */ |
840f481c | 2329 | count1--; |
b3cfe0c8 RS |
2330 | } |
2331 | ||
840f481c | 2332 | while (count1 < 0) |
b3cfe0c8 | 2333 | { |
b9145dbb | 2334 | while (1) |
b3cfe0c8 | 2335 | { |
c5683ceb | 2336 | int quoted, syntax; |
f902a008 | 2337 | |
b9145dbb RS |
2338 | if (from <= stop) |
2339 | { | |
6a140a74 | 2340 | SET_PT_BOTH (BEGV, BEGV_BYTE); |
b9145dbb RS |
2341 | immediate_quit = 0; |
2342 | return Qnil; | |
2343 | } | |
b3cfe0c8 | 2344 | |
6a140a74 | 2345 | DEC_BOTH (from, from_byte); |
f902a008 | 2346 | /* char_quoted does UPDATE_SYNTAX_TABLE_BACKWARD (from). */ |
6a140a74 | 2347 | quoted = char_quoted (from, from_byte); |
b7dbcc19 | 2348 | c = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
c5683ceb | 2349 | syntax = SYNTAX_WITH_FLAGS (c); |
b3cfe0c8 RS |
2350 | code = SYNTAX (c); |
2351 | comstyle = 0; | |
c5683ceb | 2352 | comnested = SYNTAX_FLAGS_COMMENT_NESTED (syntax); |
7fc8191e | 2353 | if (code == Sendcomment) |
c5683ceb SM |
2354 | comstyle = SYNTAX_FLAGS_COMMENT_STYLE (syntax, 0); |
2355 | if (from > stop && SYNTAX_FLAGS_COMEND_SECOND (syntax) | |
f902a008 | 2356 | && prev_char_comend_first (from, from_byte) |
89c6809a | 2357 | && !char_quoted (from - 1, dec_bytepos (from_byte))) |
b3cfe0c8 | 2358 | { |
c5683ceb | 2359 | int other_syntax; |
7fc8191e | 2360 | /* We must record the comment style encountered so that |
b3cfe0c8 | 2361 | later, we can match only the proper comment begin |
7fc8191e | 2362 | sequence of the same style. */ |
6a140a74 | 2363 | DEC_BOTH (from, from_byte); |
f902a008 RS |
2364 | code = Sendcomment; |
2365 | /* Calling char_quoted, above, set up global syntax position | |
2366 | at the new value of FROM. */ | |
b7dbcc19 | 2367 | c1 = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
c5683ceb SM |
2368 | other_syntax = SYNTAX_WITH_FLAGS (c1); |
2369 | comstyle = SYNTAX_FLAGS_COMMENT_STYLE (other_syntax, syntax); | |
2370 | comnested | |
2371 | = comnested || SYNTAX_FLAGS_COMMENT_NESTED (other_syntax); | |
b3cfe0c8 RS |
2372 | } |
2373 | ||
195d1361 RS |
2374 | if (code == Scomment_fence) |
2375 | { | |
2376 | /* Skip until first preceding unquoted comment_fence. */ | |
01f44d5a | 2377 | int fence_found = 0; |
d311d28c | 2378 | ptrdiff_t ini = from, ini_byte = from_byte; |
7d0393cf | 2379 | |
6a140a74 | 2380 | while (1) |
195d1361 | 2381 | { |
6a140a74 | 2382 | DEC_BOTH (from, from_byte); |
195d1361 | 2383 | UPDATE_SYNTAX_TABLE_BACKWARD (from); |
b7dbcc19 | 2384 | c = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
6a140a74 | 2385 | if (SYNTAX (c) == Scomment_fence |
7d0393cf | 2386 | && !char_quoted (from, from_byte)) |
195d1361 | 2387 | { |
01f44d5a | 2388 | fence_found = 1; |
195d1361 RS |
2389 | break; |
2390 | } | |
fcdd4585 SM |
2391 | else if (from == stop) |
2392 | break; | |
195d1361 | 2393 | } |
01f44d5a | 2394 | if (fence_found == 0) |
195d1361 RS |
2395 | { |
2396 | from = ini; /* Set point to ini + 1. */ | |
6a140a74 | 2397 | from_byte = ini_byte; |
195d1361 RS |
2398 | goto leave; |
2399 | } | |
39c41ad4 SM |
2400 | else |
2401 | /* We have skipped one comment. */ | |
2402 | break; | |
195d1361 RS |
2403 | } |
2404 | else if (code == Sendcomment) | |
b3cfe0c8 | 2405 | { |
95ff8dfc | 2406 | found = back_comment (from, from_byte, stop, comnested, comstyle, |
6a140a74 | 2407 | &out_charpos, &out_bytepos); |
1aa963c8 SM |
2408 | if (found == -1) |
2409 | { | |
abf8a9ff SM |
2410 | if (c == '\n') |
2411 | /* This end-of-line is not an end-of-comment. | |
2412 | Treat it like a whitespace. | |
2413 | CC-mode (and maybe others) relies on this behavior. */ | |
2414 | ; | |
2415 | else | |
2416 | { | |
2417 | /* Failure: we should go back to the end of this | |
2418 | not-quite-endcomment. */ | |
c5683ceb | 2419 | if (SYNTAX (c) != code) |
abf8a9ff SM |
2420 | /* It was a two-char Sendcomment. */ |
2421 | INC_BOTH (from, from_byte); | |
2422 | goto leave; | |
2423 | } | |
1aa963c8 | 2424 | } |
2b927d02 | 2425 | else |
abf8a9ff SM |
2426 | { |
2427 | /* We have skipped one comment. */ | |
2428 | from = out_charpos, from_byte = out_bytepos; | |
2429 | break; | |
2430 | } | |
b3cfe0c8 | 2431 | } |
bb0de084 | 2432 | else if (code != Swhitespace || quoted) |
b3cfe0c8 | 2433 | { |
195d1361 | 2434 | leave: |
b3cfe0c8 | 2435 | immediate_quit = 0; |
6a140a74 | 2436 | INC_BOTH (from, from_byte); |
ef316cf0 | 2437 | SET_PT_BOTH (from, from_byte); |
b3cfe0c8 RS |
2438 | return Qnil; |
2439 | } | |
2440 | } | |
2441 | ||
840f481c | 2442 | count1++; |
b3cfe0c8 RS |
2443 | } |
2444 | ||
ef316cf0 | 2445 | SET_PT_BOTH (from, from_byte); |
b3cfe0c8 RS |
2446 | immediate_quit = 0; |
2447 | return Qt; | |
2448 | } | |
2449 | \f | |
b7dbcc19 | 2450 | /* Return syntax code of character C if C is an ASCII character |
db9f48c3 | 2451 | or `multibyte_symbol_p' is zero. Otherwise, return Ssymbol. */ |
bd25db08 | 2452 | |
b7dbcc19 KH |
2453 | #define SYNTAX_WITH_MULTIBYTE_CHECK(c) \ |
2454 | ((ASCII_CHAR_P (c) || !multibyte_symbol_p) \ | |
bd25db08 KH |
2455 | ? SYNTAX (c) : Ssymbol) |
2456 | ||
6a140a74 | 2457 | static Lisp_Object |
971de7fb | 2458 | scan_lists (register EMACS_INT from, EMACS_INT count, EMACS_INT depth, int sexpflag) |
8489eb67 RS |
2459 | { |
2460 | Lisp_Object val; | |
d311d28c | 2461 | register ptrdiff_t stop = count > 0 ? ZV : BEGV; |
93da5fff KH |
2462 | register int c, c1; |
2463 | int stringterm; | |
8489eb67 RS |
2464 | int quoted; |
2465 | int mathexit = 0; | |
93da5fff | 2466 | register enum syntaxcode code, temp_code; |
d311d28c | 2467 | EMACS_INT min_depth = depth; /* Err out if depth gets less than this. */ |
e5d4f4dc | 2468 | int comstyle = 0; /* style of comment encountered */ |
95ff8dfc | 2469 | int comnested = 0; /* whether the comment is nestable or not */ |
d311d28c | 2470 | ptrdiff_t temp_pos; |
932e6895 | 2471 | EMACS_INT last_good = from; |
195d1361 | 2472 | int found; |
d311d28c PE |
2473 | ptrdiff_t from_byte; |
2474 | ptrdiff_t out_bytepos, out_charpos; | |
2475 | int temp; | |
7c85f529 | 2476 | EMACS_INT dummy; |
bd25db08 | 2477 | int multibyte_symbol_p = sexpflag && multibyte_syntax_as_symbol; |
8489eb67 RS |
2478 | |
2479 | if (depth > 0) min_depth = 0; | |
2480 | ||
c3907a7e RS |
2481 | if (from > ZV) from = ZV; |
2482 | if (from < BEGV) from = BEGV; | |
2483 | ||
2484 | from_byte = CHAR_TO_BYTE (from); | |
2485 | ||
8489eb67 RS |
2486 | immediate_quit = 1; |
2487 | QUIT; | |
2488 | ||
195d1361 | 2489 | SETUP_SYNTAX_TABLE (from, count); |
8489eb67 RS |
2490 | while (count > 0) |
2491 | { | |
8489eb67 RS |
2492 | while (from < stop) |
2493 | { | |
c5683ceb | 2494 | int comstart_first, prefix, syntax, other_syntax; |
195d1361 | 2495 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
b7dbcc19 | 2496 | c = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
c5683ceb | 2497 | syntax = SYNTAX_WITH_FLAGS (c); |
bd25db08 | 2498 | code = SYNTAX_WITH_MULTIBYTE_CHECK (c); |
c5683ceb SM |
2499 | comstart_first = SYNTAX_FLAGS_COMSTART_FIRST (syntax); |
2500 | comnested = SYNTAX_FLAGS_COMMENT_NESTED (syntax); | |
2501 | comstyle = SYNTAX_FLAGS_COMMENT_STYLE (syntax, 0); | |
2502 | prefix = SYNTAX_FLAGS_PREFIX (syntax); | |
7bf5e9e4 RS |
2503 | if (depth == min_depth) |
2504 | last_good = from; | |
6a140a74 | 2505 | INC_BOTH (from, from_byte); |
195d1361 | 2506 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
f902a008 | 2507 | if (from < stop && comstart_first |
327719ee | 2508 | && (c = FETCH_CHAR_AS_MULTIBYTE (from_byte), |
c5683ceb SM |
2509 | other_syntax = SYNTAX_WITH_FLAGS (c), |
2510 | SYNTAX_FLAGS_COMSTART_SECOND (other_syntax)) | |
8489eb67 | 2511 | && parse_sexp_ignore_comments) |
e5d4f4dc | 2512 | { |
7d0393cf | 2513 | /* we have encountered a comment start sequence and we |
195d1361 | 2514 | are ignoring all text inside comments. We must record |
e5d4f4dc RS |
2515 | the comment style this sequence begins so that later, |
2516 | only a comment end of the same style actually ends | |
2517 | the comment section */ | |
2518 | code = Scomment; | |
c5683ceb SM |
2519 | comstyle = SYNTAX_FLAGS_COMMENT_STYLE (other_syntax, syntax); |
2520 | comnested | |
2521 | = comnested || SYNTAX_FLAGS_COMMENT_NESTED (other_syntax); | |
6a140a74 | 2522 | INC_BOTH (from, from_byte); |
f902a008 | 2523 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
e5d4f4dc | 2524 | } |
7d0393cf | 2525 | |
f902a008 | 2526 | if (prefix) |
8489eb67 RS |
2527 | continue; |
2528 | ||
0220c518 | 2529 | switch (SWITCH_ENUM_CAST (code)) |
8489eb67 RS |
2530 | { |
2531 | case Sescape: | |
2532 | case Scharquote: | |
8b8bf8e6 SM |
2533 | if (from == stop) |
2534 | goto lose; | |
6a140a74 | 2535 | INC_BOTH (from, from_byte); |
8489eb67 RS |
2536 | /* treat following character as a word constituent */ |
2537 | case Sword: | |
2538 | case Ssymbol: | |
2539 | if (depth || !sexpflag) break; | |
195d1361 | 2540 | /* This word counts as a sexp; return at end of it. */ |
8489eb67 RS |
2541 | while (from < stop) |
2542 | { | |
195d1361 | 2543 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
7c7ca3d2 RS |
2544 | |
2545 | /* Some compilers can't handle this inside the switch. */ | |
b7dbcc19 | 2546 | c = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
bd25db08 | 2547 | temp = SYNTAX_WITH_MULTIBYTE_CHECK (c); |
7c7ca3d2 | 2548 | switch (temp) |
8489eb67 RS |
2549 | { |
2550 | case Scharquote: | |
2551 | case Sescape: | |
6a140a74 | 2552 | INC_BOTH (from, from_byte); |
8b8bf8e6 SM |
2553 | if (from == stop) |
2554 | goto lose; | |
8489eb67 RS |
2555 | break; |
2556 | case Sword: | |
2557 | case Ssymbol: | |
2558 | case Squote: | |
2559 | break; | |
2560 | default: | |
2561 | goto done; | |
2562 | } | |
6a140a74 | 2563 | INC_BOTH (from, from_byte); |
8489eb67 RS |
2564 | } |
2565 | goto done; | |
2566 | ||
195d1361 | 2567 | case Scomment_fence: |
95ff8dfc RS |
2568 | comstyle = ST_COMMENT_STYLE; |
2569 | /* FALLTHROUGH */ | |
2570 | case Scomment: | |
8489eb67 | 2571 | if (!parse_sexp_ignore_comments) break; |
95ff8dfc RS |
2572 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
2573 | found = forw_comment (from, from_byte, stop, | |
2574 | comnested, comstyle, 0, | |
2575 | &out_charpos, &out_bytepos, &dummy); | |
2576 | from = out_charpos, from_byte = out_bytepos; | |
2577 | if (!found) | |
8489eb67 | 2578 | { |
95ff8dfc RS |
2579 | if (depth == 0) |
2580 | goto done; | |
2581 | goto lose; | |
8489eb67 | 2582 | } |
95ff8dfc RS |
2583 | INC_BOTH (from, from_byte); |
2584 | UPDATE_SYNTAX_TABLE_FORWARD (from); | |
8489eb67 RS |
2585 | break; |
2586 | ||
2587 | case Smath: | |
2588 | if (!sexpflag) | |
2589 | break; | |
b7dbcc19 | 2590 | if (from != stop && c == FETCH_CHAR_AS_MULTIBYTE (from_byte)) |
6a140a74 RS |
2591 | { |
2592 | INC_BOTH (from, from_byte); | |
2593 | } | |
8489eb67 RS |
2594 | if (mathexit) |
2595 | { | |
2596 | mathexit = 0; | |
2597 | goto close1; | |
2598 | } | |
2599 | mathexit = 1; | |
2600 | ||
2601 | case Sopen: | |
2602 | if (!++depth) goto done; | |
2603 | break; | |
2604 | ||
2605 | case Sclose: | |
2606 | close1: | |
2607 | if (!--depth) goto done; | |
2608 | if (depth < min_depth) | |
9471945b KS |
2609 | xsignal3 (Qscan_error, |
2610 | build_string ("Containing expression ends prematurely"), | |
2611 | make_number (last_good), make_number (from)); | |
8489eb67 RS |
2612 | break; |
2613 | ||
2614 | case Sstring: | |
195d1361 | 2615 | case Sstring_fence: |
ef316cf0 | 2616 | temp_pos = dec_bytepos (from_byte); |
b7dbcc19 | 2617 | stringterm = FETCH_CHAR_AS_MULTIBYTE (temp_pos); |
8489eb67 RS |
2618 | while (1) |
2619 | { | |
8b8bf8e6 SM |
2620 | if (from >= stop) |
2621 | goto lose; | |
195d1361 | 2622 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
b7dbcc19 | 2623 | c = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
42ebfa31 SM |
2624 | if (code == Sstring |
2625 | ? (c == stringterm | |
2626 | && SYNTAX_WITH_MULTIBYTE_CHECK (c) == Sstring) | |
bd25db08 | 2627 | : SYNTAX_WITH_MULTIBYTE_CHECK (c) == Sstring_fence) |
195d1361 | 2628 | break; |
7c7ca3d2 RS |
2629 | |
2630 | /* Some compilers can't handle this inside the switch. */ | |
bd25db08 | 2631 | temp = SYNTAX_WITH_MULTIBYTE_CHECK (c); |
7c7ca3d2 | 2632 | switch (temp) |
8489eb67 RS |
2633 | { |
2634 | case Scharquote: | |
2635 | case Sescape: | |
6a140a74 | 2636 | INC_BOTH (from, from_byte); |
8489eb67 | 2637 | } |
6a140a74 | 2638 | INC_BOTH (from, from_byte); |
8489eb67 | 2639 | } |
6a140a74 | 2640 | INC_BOTH (from, from_byte); |
8489eb67 RS |
2641 | if (!depth && sexpflag) goto done; |
2642 | break; | |
240c43e8 SM |
2643 | default: |
2644 | /* Ignore whitespace, punctuation, quote, endcomment. */ | |
2645 | break; | |
8489eb67 RS |
2646 | } |
2647 | } | |
2648 | ||
2649 | /* Reached end of buffer. Error if within object, return nil if between */ | |
8b8bf8e6 SM |
2650 | if (depth) |
2651 | goto lose; | |
8489eb67 RS |
2652 | |
2653 | immediate_quit = 0; | |
2654 | return Qnil; | |
2655 | ||
2656 | /* End of object reached */ | |
2657 | done: | |
2658 | count--; | |
2659 | } | |
2660 | ||
2661 | while (count < 0) | |
2662 | { | |
8489eb67 RS |
2663 | while (from > stop) |
2664 | { | |
c5683ceb | 2665 | int syntax; |
6a140a74 | 2666 | DEC_BOTH (from, from_byte); |
195d1361 | 2667 | UPDATE_SYNTAX_TABLE_BACKWARD (from); |
b7dbcc19 | 2668 | c = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
c5683ceb | 2669 | syntax= SYNTAX_WITH_FLAGS (c); |
bd25db08 | 2670 | code = SYNTAX_WITH_MULTIBYTE_CHECK (c); |
7bf5e9e4 RS |
2671 | if (depth == min_depth) |
2672 | last_good = from; | |
7fc8191e | 2673 | comstyle = 0; |
c5683ceb | 2674 | comnested = SYNTAX_FLAGS_COMMENT_NESTED (syntax); |
7fc8191e | 2675 | if (code == Sendcomment) |
c5683ceb SM |
2676 | comstyle = SYNTAX_FLAGS_COMMENT_STYLE (syntax, 0); |
2677 | if (from > stop && SYNTAX_FLAGS_COMEND_SECOND (syntax) | |
1674d9a2 | 2678 | && prev_char_comend_first (from, from_byte) |
8489eb67 | 2679 | && parse_sexp_ignore_comments) |
e5d4f4dc | 2680 | { |
f902a008 | 2681 | /* We must record the comment style encountered so that |
e5d4f4dc | 2682 | later, we can match only the proper comment begin |
f902a008 | 2683 | sequence of the same style. */ |
01f44d5a | 2684 | int c2, other_syntax; |
6a140a74 | 2685 | DEC_BOTH (from, from_byte); |
f902a008 RS |
2686 | UPDATE_SYNTAX_TABLE_BACKWARD (from); |
2687 | code = Sendcomment; | |
01f44d5a PE |
2688 | c2 = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
2689 | other_syntax = SYNTAX_WITH_FLAGS (c2); | |
c5683ceb SM |
2690 | comstyle = SYNTAX_FLAGS_COMMENT_STYLE (other_syntax, syntax); |
2691 | comnested | |
2692 | = comnested || SYNTAX_FLAGS_COMMENT_NESTED (other_syntax); | |
e5d4f4dc | 2693 | } |
7d0393cf | 2694 | |
9828a477 | 2695 | /* Quoting turns anything except a comment-ender |
e6365855 | 2696 | into a word character. Note that this cannot be true |
f902a008 | 2697 | if we decremented FROM in the if-statement above. */ |
9828a477 | 2698 | if (code != Sendcomment && char_quoted (from, from_byte)) |
240c43e8 SM |
2699 | { |
2700 | DEC_BOTH (from, from_byte); | |
2701 | code = Sword; | |
2702 | } | |
c5683ceb | 2703 | else if (SYNTAX_FLAGS_PREFIX (syntax)) |
8489eb67 RS |
2704 | continue; |
2705 | ||
9828a477 | 2706 | switch (SWITCH_ENUM_CAST (code)) |
8489eb67 RS |
2707 | { |
2708 | case Sword: | |
2709 | case Ssymbol: | |
9828a477 KH |
2710 | case Sescape: |
2711 | case Scharquote: | |
8489eb67 | 2712 | if (depth || !sexpflag) break; |
195d1361 RS |
2713 | /* This word counts as a sexp; count object finished |
2714 | after passing it. */ | |
8489eb67 RS |
2715 | while (from > stop) |
2716 | { | |
6a140a74 | 2717 | temp_pos = from_byte; |
4b4deea2 | 2718 | if (! NILP (BVAR (current_buffer, enable_multibyte_characters))) |
ef316cf0 RS |
2719 | DEC_POS (temp_pos); |
2720 | else | |
2721 | temp_pos--; | |
6a140a74 | 2722 | UPDATE_SYNTAX_TABLE_BACKWARD (from - 1); |
b7dbcc19 | 2723 | c1 = FETCH_CHAR_AS_MULTIBYTE (temp_pos); |
bd25db08 | 2724 | temp_code = SYNTAX_WITH_MULTIBYTE_CHECK (c1); |
9828a477 KH |
2725 | /* Don't allow comment-end to be quoted. */ |
2726 | if (temp_code == Sendcomment) | |
2727 | goto done2; | |
6a140a74 | 2728 | quoted = char_quoted (from - 1, temp_pos); |
8489eb67 | 2729 | if (quoted) |
93da5fff | 2730 | { |
6a140a74 | 2731 | DEC_BOTH (from, from_byte); |
ef316cf0 | 2732 | temp_pos = dec_bytepos (temp_pos); |
6a140a74 | 2733 | UPDATE_SYNTAX_TABLE_BACKWARD (from - 1); |
93da5fff | 2734 | } |
b7dbcc19 | 2735 | c1 = FETCH_CHAR_AS_MULTIBYTE (temp_pos); |
bd25db08 | 2736 | temp_code = SYNTAX_WITH_MULTIBYTE_CHECK (c1); |
93da5fff KH |
2737 | if (! (quoted || temp_code == Sword |
2738 | || temp_code == Ssymbol | |
2739 | || temp_code == Squote)) | |
8489eb67 | 2740 | goto done2; |
6a140a74 | 2741 | DEC_BOTH (from, from_byte); |
8489eb67 RS |
2742 | } |
2743 | goto done2; | |
2744 | ||
2745 | case Smath: | |
2746 | if (!sexpflag) | |
2747 | break; | |
ef316cf0 | 2748 | temp_pos = dec_bytepos (from_byte); |
6a140a74 | 2749 | UPDATE_SYNTAX_TABLE_BACKWARD (from - 1); |
b7dbcc19 | 2750 | if (from != stop && c == FETCH_CHAR_AS_MULTIBYTE (temp_pos)) |
6a140a74 | 2751 | DEC_BOTH (from, from_byte); |
8489eb67 RS |
2752 | if (mathexit) |
2753 | { | |
2754 | mathexit = 0; | |
2755 | goto open2; | |
2756 | } | |
2757 | mathexit = 1; | |
2758 | ||
2759 | case Sclose: | |
2760 | if (!++depth) goto done2; | |
2761 | break; | |
2762 | ||
2763 | case Sopen: | |
2764 | open2: | |
2765 | if (!--depth) goto done2; | |
2766 | if (depth < min_depth) | |
9471945b KS |
2767 | xsignal3 (Qscan_error, |
2768 | build_string ("Containing expression ends prematurely"), | |
2769 | make_number (last_good), make_number (from)); | |
8489eb67 RS |
2770 | break; |
2771 | ||
2772 | case Sendcomment: | |
2773 | if (!parse_sexp_ignore_comments) | |
2774 | break; | |
95ff8dfc | 2775 | found = back_comment (from, from_byte, stop, comnested, comstyle, |
6a140a74 | 2776 | &out_charpos, &out_bytepos); |
1aa963c8 SM |
2777 | /* FIXME: if found == -1, then it really wasn't a comment-end. |
2778 | For single-char Sendcomment, we can't do much about it apart | |
2779 | from skipping the char. | |
2780 | For 2-char endcomments, we could try again, taking both | |
2781 | chars as separate entities, but it's a lot of trouble | |
2782 | for very little gain, so we don't bother either. -sm */ | |
6a140a74 RS |
2783 | if (found != -1) |
2784 | from = out_charpos, from_byte = out_bytepos; | |
8489eb67 RS |
2785 | break; |
2786 | ||
195d1361 RS |
2787 | case Scomment_fence: |
2788 | case Sstring_fence: | |
2789 | while (1) | |
2790 | { | |
8b8bf8e6 SM |
2791 | if (from == stop) |
2792 | goto lose; | |
6b61353c | 2793 | DEC_BOTH (from, from_byte); |
195d1361 | 2794 | UPDATE_SYNTAX_TABLE_BACKWARD (from); |
7d0393cf | 2795 | if (!char_quoted (from, from_byte) |
b7dbcc19 | 2796 | && (c = FETCH_CHAR_AS_MULTIBYTE (from_byte), |
bd25db08 | 2797 | SYNTAX_WITH_MULTIBYTE_CHECK (c) == code)) |
195d1361 RS |
2798 | break; |
2799 | } | |
2800 | if (code == Sstring_fence && !depth && sexpflag) goto done2; | |
2801 | break; | |
7d0393cf | 2802 | |
8489eb67 | 2803 | case Sstring: |
b7dbcc19 | 2804 | stringterm = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
8489eb67 RS |
2805 | while (1) |
2806 | { | |
8b8bf8e6 SM |
2807 | if (from == stop) |
2808 | goto lose; | |
6b61353c KH |
2809 | DEC_BOTH (from, from_byte); |
2810 | UPDATE_SYNTAX_TABLE_BACKWARD (from); | |
2811 | if (!char_quoted (from, from_byte) | |
2812 | && (stringterm | |
2813 | == (c = FETCH_CHAR_AS_MULTIBYTE (from_byte))) | |
42ebfa31 | 2814 | && SYNTAX_WITH_MULTIBYTE_CHECK (c) == Sstring) |
8489eb67 | 2815 | break; |
8489eb67 | 2816 | } |
8489eb67 RS |
2817 | if (!depth && sexpflag) goto done2; |
2818 | break; | |
240c43e8 SM |
2819 | default: |
2820 | /* Ignore whitespace, punctuation, quote, endcomment. */ | |
2821 | break; | |
8489eb67 RS |
2822 | } |
2823 | } | |
2824 | ||
2825 | /* Reached start of buffer. Error if within object, return nil if between */ | |
8b8bf8e6 SM |
2826 | if (depth) |
2827 | goto lose; | |
8489eb67 RS |
2828 | |
2829 | immediate_quit = 0; | |
2830 | return Qnil; | |
2831 | ||
2832 | done2: | |
2833 | count++; | |
2834 | } | |
2835 | ||
2836 | ||
2837 | immediate_quit = 0; | |
1e142fb7 | 2838 | XSETFASTINT (val, from); |
8489eb67 RS |
2839 | return val; |
2840 | ||
2841 | lose: | |
9471945b KS |
2842 | xsignal3 (Qscan_error, |
2843 | build_string ("Unbalanced parentheses"), | |
2844 | make_number (last_good), make_number (from)); | |
8489eb67 RS |
2845 | } |
2846 | ||
8489eb67 | 2847 | DEFUN ("scan-lists", Fscan_lists, Sscan_lists, 3, 3, 0, |
fdb82f93 | 2848 | doc: /* Scan from character number FROM by COUNT lists. |
7b926f3f CY |
2849 | Scan forward if COUNT is positive, backward if COUNT is negative. |
2850 | Return the character number of the position thus found. | |
2851 | ||
2852 | A \"list", in this context, refers to a balanced parenthetical | |
2853 | grouping, as determined by the syntax table. | |
fdb82f93 | 2854 | |
7b926f3f CY |
2855 | If DEPTH is nonzero, treat that as the nesting depth of the starting |
2856 | point (i.e. the starting point is DEPTH parentheses deep). This | |
2857 | function scans over parentheses until the depth goes to zero COUNT | |
2858 | times. Hence, positive DEPTH moves out that number of levels of | |
221cd413 | 2859 | parentheses, while negative DEPTH moves to a deeper level. |
fdb82f93 PJ |
2860 | |
2861 | Comments are ignored if `parse-sexp-ignore-comments' is non-nil. | |
2862 | ||
7b926f3f CY |
2863 | If we reach the beginning or end of the accessible part of the buffer |
2864 | before we have scanned over COUNT lists, return nil if the depth at | |
2865 | that point is zero, and signal a error if the depth is nonzero. */) | |
5842a27b | 2866 | (Lisp_Object from, Lisp_Object count, Lisp_Object depth) |
8489eb67 | 2867 | { |
b7826503 PJ |
2868 | CHECK_NUMBER (from); |
2869 | CHECK_NUMBER (count); | |
2870 | CHECK_NUMBER (depth); | |
8489eb67 RS |
2871 | |
2872 | return scan_lists (XINT (from), XINT (count), XINT (depth), 0); | |
2873 | } | |
2874 | ||
2875 | DEFUN ("scan-sexps", Fscan_sexps, Sscan_sexps, 2, 2, 0, | |
fdb82f93 PJ |
2876 | doc: /* Scan from character number FROM by COUNT balanced expressions. |
2877 | If COUNT is negative, scan backwards. | |
2878 | Returns the character number of the position thus found. | |
2879 | ||
2880 | Comments are ignored if `parse-sexp-ignore-comments' is non-nil. | |
2881 | ||
2882 | If the beginning or end of (the accessible part of) the buffer is reached | |
2883 | in the middle of a parenthetical grouping, an error is signaled. | |
2884 | If the beginning or end is reached between groupings | |
2885 | but before count is used up, nil is returned. */) | |
5842a27b | 2886 | (Lisp_Object from, Lisp_Object count) |
8489eb67 | 2887 | { |
b7826503 PJ |
2888 | CHECK_NUMBER (from); |
2889 | CHECK_NUMBER (count); | |
8489eb67 RS |
2890 | |
2891 | return scan_lists (XINT (from), XINT (count), 0, 1); | |
2892 | } | |
2893 | ||
2894 | DEFUN ("backward-prefix-chars", Fbackward_prefix_chars, Sbackward_prefix_chars, | |
fdb82f93 PJ |
2895 | 0, 0, 0, |
2896 | doc: /* Move point backward over any number of chars with prefix syntax. | |
2897 | This includes chars with "quote" or "prefix" syntax (' or p). */) | |
5842a27b | 2898 | (void) |
8489eb67 | 2899 | { |
d311d28c PE |
2900 | ptrdiff_t beg = BEGV; |
2901 | ptrdiff_t opoint = PT; | |
2902 | ptrdiff_t opoint_byte = PT_BYTE; | |
2903 | ptrdiff_t pos = PT; | |
2904 | ptrdiff_t pos_byte = PT_BYTE; | |
93da5fff | 2905 | int c; |
93da5fff | 2906 | |
7d0393cf | 2907 | if (pos <= beg) |
195d1361 | 2908 | { |
f902a008 RS |
2909 | SET_PT_BOTH (opoint, opoint_byte); |
2910 | ||
2911 | return Qnil; | |
195d1361 | 2912 | } |
8489eb67 | 2913 | |
f902a008 RS |
2914 | SETUP_SYNTAX_TABLE (pos, -1); |
2915 | ||
6a140a74 RS |
2916 | DEC_BOTH (pos, pos_byte); |
2917 | ||
1fd3172d | 2918 | while (!char_quoted (pos, pos_byte) |
195d1361 | 2919 | /* Previous statement updates syntax table. */ |
b7dbcc19 | 2920 | && ((c = FETCH_CHAR_AS_MULTIBYTE (pos_byte), SYNTAX (c) == Squote) |
93da5fff KH |
2921 | || SYNTAX_PREFIX (c))) |
2922 | { | |
1fd3172d RS |
2923 | opoint = pos; |
2924 | opoint_byte = pos_byte; | |
2925 | ||
2926 | if (pos + 1 > beg) | |
2927 | DEC_BOTH (pos, pos_byte); | |
93da5fff | 2928 | } |
8489eb67 | 2929 | |
6a140a74 | 2930 | SET_PT_BOTH (opoint, opoint_byte); |
8489eb67 RS |
2931 | |
2932 | return Qnil; | |
2933 | } | |
2934 | \f | |
6a140a74 | 2935 | /* Parse forward from FROM / FROM_BYTE to END, |
e5d4f4dc RS |
2936 | assuming that FROM has state OLDSTATE (nil means FROM is start of function), |
2937 | and return a description of the state of the parse at END. | |
c81a3712 | 2938 | If STOPBEFORE is nonzero, stop at the start of an atom. |
644ea4df RS |
2939 | If COMMENTSTOP is 1, stop at the start of a comment. |
2940 | If COMMENTSTOP is -1, stop at the start or end of a comment, | |
2941 | after the beginning of a string, or after the end of a string. */ | |
8489eb67 | 2942 | |
340f92b5 | 2943 | static void |
d5a3eaaf | 2944 | scan_sexps_forward (struct lisp_parse_state *stateptr, |
d311d28c PE |
2945 | ptrdiff_t from, ptrdiff_t from_byte, ptrdiff_t end, |
2946 | EMACS_INT targetdepth, int stopbefore, | |
d5a3eaaf | 2947 | Lisp_Object oldstate, int commentstop) |
8489eb67 RS |
2948 | { |
2949 | struct lisp_parse_state state; | |
2950 | ||
2951 | register enum syntaxcode code; | |
95ff8dfc RS |
2952 | int c1; |
2953 | int comnested; | |
d311d28c | 2954 | struct level { ptrdiff_t last, prev; }; |
8489eb67 RS |
2955 | struct level levelstart[100]; |
2956 | register struct level *curlevel = levelstart; | |
2957 | struct level *endlevel = levelstart + 100; | |
d311d28c | 2958 | register EMACS_INT depth; /* Paren depth of current scanning location. |
8489eb67 RS |
2959 | level - levelstart equals this except |
2960 | when the depth becomes negative. */ | |
d311d28c | 2961 | EMACS_INT mindepth; /* Lowest DEPTH value seen. */ |
8489eb67 RS |
2962 | int start_quoted = 0; /* Nonzero means starting after a char quote */ |
2963 | Lisp_Object tem; | |
d311d28c PE |
2964 | ptrdiff_t prev_from; /* Keep one character before FROM. */ |
2965 | ptrdiff_t prev_from_byte; | |
1fd3172d | 2966 | int prev_from_syntax; |
195d1361 RS |
2967 | int boundary_stop = commentstop == -1; |
2968 | int nofence; | |
95ff8dfc | 2969 | int found; |
d311d28c | 2970 | ptrdiff_t out_bytepos, out_charpos; |
7c7ca3d2 | 2971 | int temp; |
93da5fff KH |
2972 | |
2973 | prev_from = from; | |
6a140a74 RS |
2974 | prev_from_byte = from_byte; |
2975 | if (from != BEGV) | |
2976 | DEC_BOTH (prev_from, prev_from_byte); | |
93da5fff KH |
2977 | |
2978 | /* Use this macro instead of `from++'. */ | |
6a140a74 RS |
2979 | #define INC_FROM \ |
2980 | do { prev_from = from; \ | |
2981 | prev_from_byte = from_byte; \ | |
327719ee | 2982 | temp = FETCH_CHAR_AS_MULTIBYTE (prev_from_byte); \ |
ab229fdd | 2983 | prev_from_syntax = SYNTAX_WITH_FLAGS (temp); \ |
ef316cf0 | 2984 | INC_BOTH (from, from_byte); \ |
3ceb4629 SM |
2985 | if (from < end) \ |
2986 | UPDATE_SYNTAX_TABLE_FORWARD (from); \ | |
6a140a74 | 2987 | } while (0) |
8489eb67 RS |
2988 | |
2989 | immediate_quit = 1; | |
2990 | QUIT; | |
2991 | ||
265a9e55 | 2992 | if (NILP (oldstate)) |
8489eb67 RS |
2993 | { |
2994 | depth = 0; | |
2995 | state.instring = -1; | |
2996 | state.incomment = 0; | |
195d1361 RS |
2997 | state.comstyle = 0; /* comment style a by default. */ |
2998 | state.comstr_start = -1; /* no comment/string seen. */ | |
8489eb67 RS |
2999 | } |
3000 | else | |
3001 | { | |
3002 | tem = Fcar (oldstate); | |
265a9e55 | 3003 | if (!NILP (tem)) |
8489eb67 RS |
3004 | depth = XINT (tem); |
3005 | else | |
3006 | depth = 0; | |
3007 | ||
3008 | oldstate = Fcdr (oldstate); | |
3009 | oldstate = Fcdr (oldstate); | |
3010 | oldstate = Fcdr (oldstate); | |
3011 | tem = Fcar (oldstate); | |
195d1361 | 3012 | /* Check whether we are inside string_fence-style string: */ |
7d0393cf | 3013 | state.instring = (!NILP (tem) |
d311d28c | 3014 | ? (CHARACTERP (tem) ? XFASTINT (tem) : ST_STRING_STYLE) |
e76f1c44 | 3015 | : -1); |
8489eb67 RS |
3016 | |
3017 | oldstate = Fcdr (oldstate); | |
3018 | tem = Fcar (oldstate); | |
e76f1c44 GM |
3019 | state.incomment = (!NILP (tem) |
3020 | ? (INTEGERP (tem) ? XINT (tem) : -1) | |
95ff8dfc | 3021 | : 0); |
8489eb67 RS |
3022 | |
3023 | oldstate = Fcdr (oldstate); | |
3024 | tem = Fcar (oldstate); | |
265a9e55 | 3025 | start_quoted = !NILP (tem); |
e5d4f4dc | 3026 | |
95ff8dfc | 3027 | /* if the eighth element of the list is nil, we are in comment |
195d1361 RS |
3028 | style a. If it is non-nil, we are in comment style b */ |
3029 | oldstate = Fcdr (oldstate); | |
e5d4f4dc | 3030 | oldstate = Fcdr (oldstate); |
195d1361 | 3031 | tem = Fcar (oldstate); |
c5683ceb SM |
3032 | state.comstyle = (NILP (tem) |
3033 | ? 0 | |
d311d28c PE |
3034 | : (RANGED_INTEGERP (0, tem, ST_COMMENT_STYLE) |
3035 | ? XINT (tem) | |
3036 | : ST_COMMENT_STYLE)); | |
195d1361 | 3037 | |
e5d4f4dc | 3038 | oldstate = Fcdr (oldstate); |
e5d4f4dc | 3039 | tem = Fcar (oldstate); |
d311d28c PE |
3040 | state.comstr_start = |
3041 | RANGED_INTEGERP (PTRDIFF_MIN, tem, PTRDIFF_MAX) ? XINT (tem) : -1; | |
1a102a58 RS |
3042 | oldstate = Fcdr (oldstate); |
3043 | tem = Fcar (oldstate); | |
3044 | while (!NILP (tem)) /* >= second enclosing sexps. */ | |
3045 | { | |
d311d28c PE |
3046 | Lisp_Object temhd = Fcar (tem); |
3047 | if (RANGED_INTEGERP (PTRDIFF_MIN, temhd, PTRDIFF_MAX)) | |
3048 | curlevel->last = XINT (temhd); | |
1a102a58 | 3049 | if (++curlevel == endlevel) |
02010917 | 3050 | curlevel--; /* error ("Nesting too deep for parser"); */ |
1a102a58 RS |
3051 | curlevel->prev = -1; |
3052 | curlevel->last = -1; | |
3053 | tem = Fcdr (tem); | |
3054 | } | |
8489eb67 RS |
3055 | } |
3056 | state.quoted = 0; | |
3057 | mindepth = depth; | |
3058 | ||
3059 | curlevel->prev = -1; | |
3060 | curlevel->last = -1; | |
3061 | ||
326b283b | 3062 | SETUP_SYNTAX_TABLE (prev_from, 1); |
ab229fdd AS |
3063 | temp = FETCH_CHAR (prev_from_byte); |
3064 | prev_from_syntax = SYNTAX_WITH_FLAGS (temp); | |
3ceb4629 | 3065 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
326b283b | 3066 | |
195d1361 | 3067 | /* Enter the loop at a place appropriate for initial state. */ |
8489eb67 | 3068 | |
326b283b RS |
3069 | if (state.incomment) |
3070 | goto startincomment; | |
8489eb67 RS |
3071 | if (state.instring >= 0) |
3072 | { | |
195d1361 | 3073 | nofence = state.instring != ST_STRING_STYLE; |
326b283b RS |
3074 | if (start_quoted) |
3075 | goto startquotedinstring; | |
8489eb67 RS |
3076 | goto startinstring; |
3077 | } | |
326b283b RS |
3078 | else if (start_quoted) |
3079 | goto startquoted; | |
1fd3172d | 3080 | |
8489eb67 RS |
3081 | while (from < end) |
3082 | { | |
c5683ceb | 3083 | int syntax; |
93da5fff | 3084 | INC_FROM; |
1fd3172d | 3085 | code = prev_from_syntax & 0xff; |
4c920633 | 3086 | |
c5d4b96f SM |
3087 | if (from < end |
3088 | && SYNTAX_FLAGS_COMSTART_FIRST (prev_from_syntax) | |
3089 | && (c1 = FETCH_CHAR (from_byte), | |
c5683ceb SM |
3090 | syntax = SYNTAX_WITH_FLAGS (c1), |
3091 | SYNTAX_FLAGS_COMSTART_SECOND (syntax))) | |
c5d4b96f SM |
3092 | /* Duplicate code to avoid a complex if-expression |
3093 | which causes trouble for the SGI compiler. */ | |
95ff8dfc | 3094 | { |
c5d4b96f SM |
3095 | /* Record the comment style we have entered so that only |
3096 | the comment-end sequence of the same style actually | |
3097 | terminates the comment section. */ | |
c5683ceb SM |
3098 | state.comstyle |
3099 | = SYNTAX_FLAGS_COMMENT_STYLE (syntax, prev_from_syntax); | |
c5d4b96f | 3100 | comnested = SYNTAX_FLAGS_COMMENT_NESTED (prev_from_syntax); |
c5683ceb | 3101 | comnested = comnested || SYNTAX_FLAGS_COMMENT_NESTED (syntax); |
c5d4b96f | 3102 | state.incomment = comnested ? 1 : -1; |
95ff8dfc | 3103 | state.comstr_start = prev_from; |
c5d4b96f SM |
3104 | INC_FROM; |
3105 | code = Scomment; | |
95ff8dfc | 3106 | } |
4c920633 | 3107 | else if (code == Scomment_fence) |
e5d4f4dc RS |
3108 | { |
3109 | /* Record the comment style we have entered so that only | |
3110 | the comment-end sequence of the same style actually | |
3111 | terminates the comment section. */ | |
95ff8dfc RS |
3112 | state.comstyle = ST_COMMENT_STYLE; |
3113 | state.incomment = -1; | |
195d1361 | 3114 | state.comstr_start = prev_from; |
e5d4f4dc | 3115 | code = Scomment; |
e5d4f4dc | 3116 | } |
c5d4b96f SM |
3117 | else if (code == Scomment) |
3118 | { | |
c5683ceb | 3119 | state.comstyle = SYNTAX_FLAGS_COMMENT_STYLE (prev_from_syntax, 0); |
c5d4b96f SM |
3120 | state.incomment = (SYNTAX_FLAGS_COMMENT_NESTED (prev_from_syntax) ? |
3121 | 1 : -1); | |
3122 | state.comstr_start = prev_from; | |
3123 | } | |
e5d4f4dc | 3124 | |
1fd3172d | 3125 | if (SYNTAX_FLAGS_PREFIX (prev_from_syntax)) |
8489eb67 | 3126 | continue; |
0220c518 | 3127 | switch (SWITCH_ENUM_CAST (code)) |
8489eb67 RS |
3128 | { |
3129 | case Sescape: | |
3130 | case Scharquote: | |
3131 | if (stopbefore) goto stop; /* this arg means stop at sexp start */ | |
93da5fff | 3132 | curlevel->last = prev_from; |
8489eb67 RS |
3133 | startquoted: |
3134 | if (from == end) goto endquoted; | |
93da5fff | 3135 | INC_FROM; |
8489eb67 RS |
3136 | goto symstarted; |
3137 | /* treat following character as a word constituent */ | |
3138 | case Sword: | |
3139 | case Ssymbol: | |
3140 | if (stopbefore) goto stop; /* this arg means stop at sexp start */ | |
93da5fff | 3141 | curlevel->last = prev_from; |
8489eb67 RS |
3142 | symstarted: |
3143 | while (from < end) | |
3144 | { | |
7c7ca3d2 | 3145 | /* Some compilers can't handle this inside the switch. */ |
327719ee | 3146 | temp = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
ab229fdd | 3147 | temp = SYNTAX (temp); |
7c7ca3d2 | 3148 | switch (temp) |
8489eb67 RS |
3149 | { |
3150 | case Scharquote: | |
3151 | case Sescape: | |
93da5fff | 3152 | INC_FROM; |
8489eb67 RS |
3153 | if (from == end) goto endquoted; |
3154 | break; | |
3155 | case Sword: | |
3156 | case Ssymbol: | |
3157 | case Squote: | |
3158 | break; | |
3159 | default: | |
3160 | goto symdone; | |
3161 | } | |
93da5fff | 3162 | INC_FROM; |
8489eb67 RS |
3163 | } |
3164 | symdone: | |
3165 | curlevel->prev = curlevel->last; | |
3166 | break; | |
3167 | ||
240c43e8 | 3168 | case Scomment_fence: /* Can't happen because it's handled above. */ |
8489eb67 | 3169 | case Scomment: |
195d1361 | 3170 | if (commentstop || boundary_stop) goto done; |
d355bd8a SM |
3171 | startincomment: |
3172 | /* The (from == BEGV) test was to enter the loop in the middle so | |
95ff8dfc | 3173 | that we find a 2-char comment ender even if we start in the |
e6365855 | 3174 | middle of it. We don't want to do that if we're just at the |
d355bd8a | 3175 | beginning of the comment (think of (*) ... (*)). */ |
95ff8dfc RS |
3176 | found = forw_comment (from, from_byte, end, |
3177 | state.incomment, state.comstyle, | |
e6365855 SM |
3178 | (from == BEGV || from < state.comstr_start + 3) |
3179 | ? 0 : prev_from_syntax, | |
95ff8dfc RS |
3180 | &out_charpos, &out_bytepos, &state.incomment); |
3181 | from = out_charpos; from_byte = out_bytepos; | |
3182 | /* Beware! prev_from and friends are invalid now. | |
3183 | Luckily, the `done' doesn't use them and the INC_FROM | |
3184 | sets them to a sane value without looking at them. */ | |
3185 | if (!found) goto done; | |
d355bd8a | 3186 | INC_FROM; |
8489eb67 | 3187 | state.incomment = 0; |
e5d4f4dc | 3188 | state.comstyle = 0; /* reset the comment style */ |
195d1361 | 3189 | if (boundary_stop) goto done; |
8489eb67 RS |
3190 | break; |
3191 | ||
3192 | case Sopen: | |
3193 | if (stopbefore) goto stop; /* this arg means stop at sexp start */ | |
3194 | depth++; | |
3195 | /* curlevel++->last ran into compiler bug on Apollo */ | |
93da5fff | 3196 | curlevel->last = prev_from; |
8489eb67 | 3197 | if (++curlevel == endlevel) |
02010917 | 3198 | curlevel--; /* error ("Nesting too deep for parser"); */ |
8489eb67 RS |
3199 | curlevel->prev = -1; |
3200 | curlevel->last = -1; | |
30844415 | 3201 | if (targetdepth == depth) goto done; |
8489eb67 RS |
3202 | break; |
3203 | ||
3204 | case Sclose: | |
3205 | depth--; | |
3206 | if (depth < mindepth) | |
3207 | mindepth = depth; | |
3208 | if (curlevel != levelstart) | |
3209 | curlevel--; | |
3210 | curlevel->prev = curlevel->last; | |
30844415 | 3211 | if (targetdepth == depth) goto done; |
8489eb67 RS |
3212 | break; |
3213 | ||
3214 | case Sstring: | |
195d1361 RS |
3215 | case Sstring_fence: |
3216 | state.comstr_start = from - 1; | |
8489eb67 | 3217 | if (stopbefore) goto stop; /* this arg means stop at sexp start */ |
93da5fff | 3218 | curlevel->last = prev_from; |
7d0393cf | 3219 | state.instring = (code == Sstring |
b7dbcc19 | 3220 | ? (FETCH_CHAR_AS_MULTIBYTE (prev_from_byte)) |
195d1361 RS |
3221 | : ST_STRING_STYLE); |
3222 | if (boundary_stop) goto done; | |
8489eb67 | 3223 | startinstring: |
195d1361 | 3224 | { |
644ea4df | 3225 | nofence = state.instring != ST_STRING_STYLE; |
7d0393cf | 3226 | |
644ea4df RS |
3227 | while (1) |
3228 | { | |
3229 | int c; | |
195d1361 | 3230 | |
644ea4df | 3231 | if (from >= end) goto done; |
b7dbcc19 | 3232 | c = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
7c7ca3d2 RS |
3233 | /* Some compilers can't handle this inside the switch. */ |
3234 | temp = SYNTAX (c); | |
ccf89641 KH |
3235 | |
3236 | /* Check TEMP here so that if the char has | |
3237 | a syntax-table property which says it is NOT | |
3238 | a string character, it does not end the string. */ | |
3239 | if (nofence && c == state.instring && temp == Sstring) | |
3240 | break; | |
3241 | ||
7c7ca3d2 | 3242 | switch (temp) |
644ea4df RS |
3243 | { |
3244 | case Sstring_fence: | |
3245 | if (!nofence) goto string_end; | |
3246 | break; | |
3247 | case Scharquote: | |
3248 | case Sescape: | |
3249 | INC_FROM; | |
3250 | startquotedinstring: | |
3251 | if (from >= end) goto endquoted; | |
195d1361 | 3252 | } |
644ea4df RS |
3253 | INC_FROM; |
3254 | } | |
195d1361 RS |
3255 | } |
3256 | string_end: | |
8489eb67 RS |
3257 | state.instring = -1; |
3258 | curlevel->prev = curlevel->last; | |
93da5fff | 3259 | INC_FROM; |
195d1361 | 3260 | if (boundary_stop) goto done; |
8489eb67 RS |
3261 | break; |
3262 | ||
3263 | case Smath: | |
240c43e8 SM |
3264 | /* FIXME: We should do something with it. */ |
3265 | break; | |
3266 | default: | |
3267 | /* Ignore whitespace, punctuation, quote, endcomment. */ | |
8489eb67 RS |
3268 | break; |
3269 | } | |
3270 | } | |
3271 | goto done; | |
3272 | ||
3273 | stop: /* Here if stopping before start of sexp. */ | |
93da5fff | 3274 | from = prev_from; /* We have just fetched the char that starts it; */ |
8489eb67 RS |
3275 | goto done; /* but return the position before it. */ |
3276 | ||
3277 | endquoted: | |
3278 | state.quoted = 1; | |
3279 | done: | |
3280 | state.depth = depth; | |
3281 | state.mindepth = mindepth; | |
3282 | state.thislevelstart = curlevel->prev; | |
3283 | state.prevlevelstart | |
3284 | = (curlevel == levelstart) ? -1 : (curlevel - 1)->last; | |
3285 | state.location = from; | |
1a102a58 | 3286 | state.levelstarts = Qnil; |
eb4d412d PE |
3287 | while (curlevel > levelstart) |
3288 | state.levelstarts = Fcons (make_number ((--curlevel)->last), | |
3289 | state.levelstarts); | |
8489eb67 RS |
3290 | immediate_quit = 0; |
3291 | ||
e5d4f4dc | 3292 | *stateptr = state; |
8489eb67 RS |
3293 | } |
3294 | ||
c81a3712 | 3295 | DEFUN ("parse-partial-sexp", Fparse_partial_sexp, Sparse_partial_sexp, 2, 6, 0, |
fdb82f93 PJ |
3296 | doc: /* Parse Lisp syntax starting at FROM until TO; return status of parse at TO. |
3297 | Parsing stops at TO or when certain criteria are met; | |
3298 | point is set to where parsing stops. | |
3299 | If fifth arg OLDSTATE is omitted or nil, | |
3300 | parsing assumes that FROM is the beginning of a function. | |
0e6228bc | 3301 | Value is a list of elements describing final state of parsing: |
fdb82f93 PJ |
3302 | 0. depth in parens. |
3303 | 1. character address of start of innermost containing list; nil if none. | |
3304 | 2. character address of start of last complete sexp terminated. | |
3305 | 3. non-nil if inside a string. | |
3306 | (it is the character that will terminate the string, | |
3307 | or t if the string should be terminated by a generic string delimiter.) | |
7d0393cf | 3308 | 4. nil if outside a comment, t if inside a non-nestable comment, |
fdb82f93 PJ |
3309 | else an integer (the current comment nesting). |
3310 | 5. t if following a quote character. | |
3311 | 6. the minimum paren-depth encountered during this scan. | |
c5683ceb | 3312 | 7. style of comment, if any. |
fdb82f93 PJ |
3313 | 8. character address of start of comment or string; nil if not in one. |
3314 | 9. Intermediate data for continuation of parsing (subject to change). | |
3315 | If third arg TARGETDEPTH is non-nil, parsing stops if the depth | |
3316 | in parentheses becomes equal to TARGETDEPTH. | |
3317 | Fourth arg STOPBEFORE non-nil means stop when come to | |
3318 | any character that starts a sexp. | |
0e6228bc | 3319 | Fifth arg OLDSTATE is a list like what this function returns. |
fdb82f93 | 3320 | It is used to initialize the state of the parse. Elements number 1, 2, 6 |
d311d28c | 3321 | are ignored. |
fdb82f93 PJ |
3322 | Sixth arg COMMENTSTOP non-nil means stop at the start of a comment. |
3323 | If it is symbol `syntax-table', stop after the start of a comment or a | |
3324 | string, or after end of a comment or a string. */) | |
5842a27b | 3325 | (Lisp_Object from, Lisp_Object to, Lisp_Object targetdepth, Lisp_Object stopbefore, Lisp_Object oldstate, Lisp_Object commentstop) |
8489eb67 RS |
3326 | { |
3327 | struct lisp_parse_state state; | |
d311d28c | 3328 | EMACS_INT target; |
8489eb67 | 3329 | |
265a9e55 | 3330 | if (!NILP (targetdepth)) |
8489eb67 | 3331 | { |
b7826503 | 3332 | CHECK_NUMBER (targetdepth); |
8489eb67 RS |
3333 | target = XINT (targetdepth); |
3334 | } | |
3335 | else | |
d311d28c | 3336 | target = TYPE_MINIMUM (EMACS_INT); /* We won't reach this depth */ |
8489eb67 RS |
3337 | |
3338 | validate_region (&from, &to); | |
6a140a74 RS |
3339 | scan_sexps_forward (&state, XINT (from), CHAR_TO_BYTE (XINT (from)), |
3340 | XINT (to), | |
c81a3712 | 3341 | target, !NILP (stopbefore), oldstate, |
7d0393cf | 3342 | (NILP (commentstop) |
195d1361 | 3343 | ? 0 : (EQ (commentstop, Qsyntax_table) ? -1 : 1))); |
8489eb67 RS |
3344 | |
3345 | SET_PT (state.location); | |
7d0393cf | 3346 | |
8489eb67 | 3347 | return Fcons (make_number (state.depth), |
c5683ceb SM |
3348 | Fcons (state.prevlevelstart < 0 |
3349 | ? Qnil : make_number (state.prevlevelstart), | |
3350 | Fcons (state.thislevelstart < 0 | |
3351 | ? Qnil : make_number (state.thislevelstart), | |
7d0393cf JB |
3352 | Fcons (state.instring >= 0 |
3353 | ? (state.instring == ST_STRING_STYLE | |
195d1361 | 3354 | ? Qt : make_number (state.instring)) : Qnil, |
95ff8dfc RS |
3355 | Fcons (state.incomment < 0 ? Qt : |
3356 | (state.incomment == 0 ? Qnil : | |
3357 | make_number (state.incomment)), | |
8489eb67 | 3358 | Fcons (state.quoted ? Qt : Qnil, |
bff37d2a | 3359 | Fcons (make_number (state.mindepth), |
7d0393cf | 3360 | Fcons ((state.comstyle |
bff37d2a | 3361 | ? (state.comstyle == ST_COMMENT_STYLE |
c5683ceb SM |
3362 | ? Qsyntax_table |
3363 | : make_number (state.comstyle)) | |
3364 | : Qnil), | |
0beaf54f DL |
3365 | Fcons (((state.incomment |
3366 | || (state.instring >= 0)) | |
bff37d2a RS |
3367 | ? make_number (state.comstr_start) |
3368 | : Qnil), | |
1a102a58 | 3369 | Fcons (state.levelstarts, Qnil)))))))))); |
8489eb67 RS |
3370 | } |
3371 | \f | |
dfcf069d | 3372 | void |
971de7fb | 3373 | init_syntax_once (void) |
8489eb67 | 3374 | { |
78f9a1f7 | 3375 | register int i, c; |
8ea151b2 | 3376 | Lisp_Object temp; |
8489eb67 | 3377 | |
5ebaddf5 | 3378 | /* This has to be done here, before we call Fmake_char_table. */ |
cd3520a4 | 3379 | DEFSYM (Qsyntax_table, "syntax-table"); |
5ebaddf5 | 3380 | |
d67b4f80 | 3381 | /* Intern_C_String this now in case it isn't already done. |
5ebaddf5 RS |
3382 | Setting this variable twice is harmless. |
3383 | But don't staticpro it here--that is done in alloc.c. */ | |
d67b4f80 | 3384 | Qchar_table_extra_slots = intern_c_string ("char-table-extra-slots"); |
5ebaddf5 | 3385 | |
93da5fff | 3386 | /* Create objects which can be shared among syntax tables. */ |
42ebfa31 | 3387 | Vsyntax_code_object = Fmake_vector (make_number (Smax), Qnil); |
77b37c05 | 3388 | for (i = 0; i < ASIZE (Vsyntax_code_object); i++) |
93da5fff KH |
3389 | XVECTOR (Vsyntax_code_object)->contents[i] |
3390 | = Fcons (make_number (i), Qnil); | |
3391 | ||
5ebaddf5 RS |
3392 | /* Now we are ready to set up this property, so we can |
3393 | create syntax tables. */ | |
3394 | Fput (Qsyntax_table, Qchar_table_extra_slots, make_number (0)); | |
3395 | ||
93da5fff | 3396 | temp = XVECTOR (Vsyntax_code_object)->contents[(int) Swhitespace]; |
8489eb67 | 3397 | |
5ebaddf5 | 3398 | Vstandard_syntax_table = Fmake_char_table (Qsyntax_table, temp); |
8489eb67 | 3399 | |
aa7b08b4 RS |
3400 | /* Control characters should not be whitespace. */ |
3401 | temp = XVECTOR (Vsyntax_code_object)->contents[(int) Spunct]; | |
3402 | for (i = 0; i <= ' ' - 1; i++) | |
3403 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, i, temp); | |
3404 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, 0177, temp); | |
3405 | ||
3406 | /* Except that a few really are whitespace. */ | |
3407 | temp = XVECTOR (Vsyntax_code_object)->contents[(int) Swhitespace]; | |
3408 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, ' ', temp); | |
3409 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '\t', temp); | |
3410 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '\n', temp); | |
3411 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, 015, temp); | |
3412 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, 014, temp); | |
3413 | ||
93da5fff | 3414 | temp = XVECTOR (Vsyntax_code_object)->contents[(int) Sword]; |
8489eb67 | 3415 | for (i = 'a'; i <= 'z'; i++) |
8ea151b2 | 3416 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, i, temp); |
8489eb67 | 3417 | for (i = 'A'; i <= 'Z'; i++) |
8ea151b2 | 3418 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, i, temp); |
8489eb67 | 3419 | for (i = '0'; i <= '9'; i++) |
8ea151b2 RS |
3420 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, i, temp); |
3421 | ||
3422 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '$', temp); | |
3423 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '%', temp); | |
3424 | ||
3425 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '(', | |
3426 | Fcons (make_number (Sopen), make_number (')'))); | |
3427 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, ')', | |
3428 | Fcons (make_number (Sclose), make_number ('('))); | |
3429 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '[', | |
3430 | Fcons (make_number (Sopen), make_number (']'))); | |
3431 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, ']', | |
3432 | Fcons (make_number (Sclose), make_number ('['))); | |
3433 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '{', | |
3434 | Fcons (make_number (Sopen), make_number ('}'))); | |
3435 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '}', | |
3436 | Fcons (make_number (Sclose), make_number ('{'))); | |
3437 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '"', | |
3438 | Fcons (make_number ((int) Sstring), Qnil)); | |
3439 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '\\', | |
3440 | Fcons (make_number ((int) Sescape), Qnil)); | |
3441 | ||
93da5fff | 3442 | temp = XVECTOR (Vsyntax_code_object)->contents[(int) Ssymbol]; |
8489eb67 | 3443 | for (i = 0; i < 10; i++) |
78f9a1f7 KH |
3444 | { |
3445 | c = "_-+*/&|<>="[i]; | |
3446 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, c, temp); | |
3447 | } | |
8489eb67 | 3448 | |
93da5fff | 3449 | temp = XVECTOR (Vsyntax_code_object)->contents[(int) Spunct]; |
8489eb67 | 3450 | for (i = 0; i < 12; i++) |
78f9a1f7 KH |
3451 | { |
3452 | c = ".,;:?!#@~^'`"[i]; | |
3453 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, c, temp); | |
3454 | } | |
bd25db08 KH |
3455 | |
3456 | /* All multibyte characters have syntax `word' by default. */ | |
3457 | temp = XVECTOR (Vsyntax_code_object)->contents[(int) Sword]; | |
5c7b02ab | 3458 | char_table_set_range (Vstandard_syntax_table, 0x80, MAX_CHAR, temp); |
8489eb67 RS |
3459 | } |
3460 | ||
dfcf069d | 3461 | void |
971de7fb | 3462 | syms_of_syntax (void) |
8489eb67 | 3463 | { |
cd3520a4 | 3464 | DEFSYM (Qsyntax_table_p, "syntax-table-p"); |
8489eb67 | 3465 | |
93da5fff KH |
3466 | staticpro (&Vsyntax_code_object); |
3467 | ||
a2994c46 KS |
3468 | staticpro (&gl_state.object); |
3469 | staticpro (&gl_state.global_code); | |
3470 | staticpro (&gl_state.current_syntax_table); | |
3471 | staticpro (&gl_state.old_prop); | |
3472 | ||
3473 | /* Defined in regex.c */ | |
3474 | staticpro (&re_match_object); | |
3475 | ||
cd3520a4 | 3476 | DEFSYM (Qscan_error, "scan-error"); |
7bf5e9e4 | 3477 | Fput (Qscan_error, Qerror_conditions, |
d67b4f80 | 3478 | pure_cons (Qscan_error, pure_cons (Qerror, Qnil))); |
7bf5e9e4 | 3479 | Fput (Qscan_error, Qerror_message, |
d67b4f80 | 3480 | make_pure_c_string ("Scan error")); |
7bf5e9e4 | 3481 | |
29208e82 | 3482 | DEFVAR_BOOL ("parse-sexp-ignore-comments", parse_sexp_ignore_comments, |
fdb82f93 | 3483 | doc: /* Non-nil means `forward-sexp', etc., should treat comments as whitespace. */); |
8489eb67 | 3484 | |
29208e82 | 3485 | DEFVAR_BOOL ("parse-sexp-lookup-properties", parse_sexp_lookup_properties, |
fdb82f93 PJ |
3486 | doc: /* Non-nil means `forward-sexp', etc., obey `syntax-table' property. |
3487 | Otherwise, that text property is simply ignored. | |
3488 | See the info node `(elisp)Syntax Properties' for a description of the | |
3489 | `syntax-table' property. */); | |
195d1361 | 3490 | |
8489eb67 | 3491 | words_include_escapes = 0; |
29208e82 | 3492 | DEFVAR_BOOL ("words-include-escapes", words_include_escapes, |
fdb82f93 | 3493 | doc: /* Non-nil means `forward-word', etc., should treat escape chars part of words. */); |
8489eb67 | 3494 | |
29208e82 | 3495 | DEFVAR_BOOL ("multibyte-syntax-as-symbol", multibyte_syntax_as_symbol, |
fdb82f93 | 3496 | doc: /* Non-nil means `scan-sexps' treats all multibyte characters as symbol. */); |
bd25db08 KH |
3497 | multibyte_syntax_as_symbol = 0; |
3498 | ||
f4ed767f | 3499 | DEFVAR_BOOL ("open-paren-in-column-0-is-defun-start", |
29208e82 | 3500 | open_paren_in_column_0_is_defun_start, |
fb7ada5f | 3501 | doc: /* Non-nil means an open paren in column 0 denotes the start of a defun. */); |
f4ed767f GM |
3502 | open_paren_in_column_0_is_defun_start = 1; |
3503 | ||
8f924df7 KH |
3504 | |
3505 | DEFVAR_LISP ("find-word-boundary-function-table", | |
29208e82 | 3506 | Vfind_word_boundary_function_table, |
869bb237 | 3507 | doc: /* |
8f924df7 | 3508 | Char table of functions to search for the word boundary. |
869bb237 KH |
3509 | Each function is called with two arguments; POS and LIMIT. |
3510 | POS and LIMIT are character positions in the current buffer. | |
3511 | ||
3512 | If POS is less than LIMIT, POS is at the first character of a word, | |
3513 | and the return value of a function is a position after the last | |
3514 | character of that word. | |
3515 | ||
3516 | If POS is not less than LIMIT, POS is at the last character of a word, | |
3517 | and the return value of a function is a position at the first | |
3518 | character of that word. | |
3519 | ||
3520 | In both cases, LIMIT bounds the search. */); | |
8f924df7 | 3521 | Vfind_word_boundary_function_table = Fmake_char_table (Qnil, Qnil); |
869bb237 | 3522 | |
8489eb67 RS |
3523 | defsubr (&Ssyntax_table_p); |
3524 | defsubr (&Ssyntax_table); | |
3525 | defsubr (&Sstandard_syntax_table); | |
3526 | defsubr (&Scopy_syntax_table); | |
3527 | defsubr (&Sset_syntax_table); | |
3528 | defsubr (&Schar_syntax); | |
beefa22e | 3529 | defsubr (&Smatching_paren); |
c65adb44 | 3530 | defsubr (&Sstring_to_syntax); |
8489eb67 | 3531 | defsubr (&Smodify_syntax_entry); |
62abe9cb | 3532 | defsubr (&Sinternal_describe_syntax_value); |
8489eb67 RS |
3533 | |
3534 | defsubr (&Sforward_word); | |
3535 | ||
195d1361 RS |
3536 | defsubr (&Sskip_chars_forward); |
3537 | defsubr (&Sskip_chars_backward); | |
3538 | defsubr (&Sskip_syntax_forward); | |
3539 | defsubr (&Sskip_syntax_backward); | |
3540 | ||
b3cfe0c8 | 3541 | defsubr (&Sforward_comment); |
8489eb67 RS |
3542 | defsubr (&Sscan_lists); |
3543 | defsubr (&Sscan_sexps); | |
3544 | defsubr (&Sbackward_prefix_chars); | |
3545 | defsubr (&Sparse_partial_sexp); | |
3546 | } |