Mercurial > hg > xemacs-beta
annotate src/syntax.c @ 4679:2c64d2bbb316
Test the multiple-value functionality.
tests/ChangeLog addition:
2009-08-16 Aidan Kehoe <kehoea@parhasard.net>
* automated/lisp-tests.el (foo):
Test the Common Lisp-compatibile multiple value functionality.
| author | Aidan Kehoe <kehoea@parhasard.net> |
|---|---|
| date | Sun, 16 Aug 2009 21:00:08 +0100 |
| parents | 25e5e5346d31 |
| children | 3a87551bfeb5 |
| rev | line source |
|---|---|
| 428 | 1 /* XEmacs routines to deal with syntax tables; also word and list parsing. |
| 2 Copyright (C) 1985-1994 Free Software Foundation, Inc. | |
| 3 Copyright (C) 1995 Sun Microsystems, Inc. | |
| 1296 | 4 Copyright (C) 2001, 2002, 2003 Ben Wing. |
| 428 | 5 |
| 6 This file is part of XEmacs. | |
| 7 | |
| 8 XEmacs is free software; you can redistribute it and/or modify it | |
| 9 under the terms of the GNU General Public License as published by the | |
| 10 Free Software Foundation; either version 2, or (at your option) any | |
| 11 later version. | |
| 12 | |
| 13 XEmacs is distributed in the hope that it will be useful, but WITHOUT | |
| 14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 16 for more details. | |
| 17 | |
| 18 You should have received a copy of the GNU General Public License | |
| 19 along with XEmacs; see the file COPYING. If not, write to | |
| 20 the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
| 21 Boston, MA 02111-1307, USA. */ | |
| 22 | |
| 23 /* Synched up with: FSF 19.28. */ | |
| 24 | |
| 25 /* This file has been Mule-ized. */ | |
| 26 | |
| 27 #include <config.h> | |
| 28 #include "lisp.h" | |
| 29 | |
| 30 #include "buffer.h" | |
| 31 #include "syntax.h" | |
| 460 | 32 #include "extents.h" |
| 428 | 33 |
| 460 | 34 #define ST_COMMENT_STYLE 0x101 |
| 35 #define ST_STRING_STYLE 0x102 | |
| 36 | |
| 37 Lisp_Object Qsyntax_table; | |
| 38 int lookup_syntax_properties; | |
| 39 | |
| 428 | 40 Lisp_Object Qsyntax_table_p; |
| 41 | |
| 42 int words_include_escapes; | |
| 43 | |
| 44 int parse_sexp_ignore_comments; | |
| 45 | |
| 46 /* The following two variables are provided to tell additional information | |
| 47 to the regex routines. We do it this way rather than change the | |
| 48 arguments to re_search_2() in an attempt to maintain some call | |
| 49 compatibility with other versions of the regex code. */ | |
| 50 | |
| 51 /* Tell the regex routines not to QUIT. Normally there is a QUIT | |
| 52 each iteration in re_search_2(). */ | |
| 53 int no_quit_in_re_search; | |
| 54 | |
| 826 | 55 /* The standard syntax table is stored where it will automatically |
| 56 be used in all new buffers. */ | |
| 428 | 57 Lisp_Object Vstandard_syntax_table; |
| 58 | |
| 59 Lisp_Object Vsyntax_designator_chars_string; | |
| 60 | |
| 826 | 61 Lisp_Object Vtemp_table_for_use_updating_syntax_tables; |
| 62 | |
| 1296 | 63 /* A value that is guaranteed not be in a syntax table. */ |
| 64 Lisp_Object Vbogus_syntax_table_value; | |
| 65 | |
| 826 | 66 static void syntax_cache_table_was_changed (struct buffer *buf); |
| 67 | |
| 428 | 68 /* This is the internal form of the parse state used in parse-partial-sexp. */ |
| 69 | |
| 70 struct lisp_parse_state | |
| 71 { | |
| 72 int depth; /* Depth at end of parsing */ | |
| 867 | 73 Ichar instring; /* -1 if not within string, else desired terminator */ |
| 428 | 74 int incomment; /* Nonzero if within a comment at end of parsing */ |
| 460 | 75 int comstyle; /* comment style a=0, or b=1, or ST_COMMENT_STYLE */ |
| 428 | 76 int quoted; /* Nonzero if just after an escape char at end of |
| 77 parsing */ | |
| 665 | 78 Charbpos thislevelstart;/* Char number of most recent start-of-expression |
| 428 | 79 at current level */ |
| 665 | 80 Charbpos prevlevelstart;/* Char number of start of containing expression */ |
| 81 Charbpos location; /* Char number at which parsing stopped */ | |
| 428 | 82 int mindepth; /* Minimum depth seen while scanning */ |
| 826 | 83 Charbpos comstr_start;/* Position just after last comment/string starter */ |
| 84 Lisp_Object levelstarts;/* Char numbers of starts-of-expression | |
| 85 of levels (starting from outermost). */ | |
| 428 | 86 }; |
| 87 | |
| 88 /* These variables are a cache for finding the start of a defun. | |
| 89 find_start_pos is the place for which the defun start was found. | |
| 90 find_start_value is the defun start position found for it. | |
| 91 find_start_buffer is the buffer it was found in. | |
| 92 find_start_begv is the BEGV value when it was found. | |
| 93 find_start_modiff is the value of MODIFF when it was found. */ | |
| 94 | |
| 665 | 95 static Charbpos find_start_pos; |
| 96 static Charbpos find_start_value; | |
| 428 | 97 static struct buffer *find_start_buffer; |
| 665 | 98 static Charbpos find_start_begv; |
| 428 | 99 static int find_start_modiff; |
| 100 | |
| 101 /* Find a defun-start that is the last one before POS (or nearly the last). | |
| 102 We record what we find, so that another call in the same area | |
| 103 can return the same value right away. */ | |
| 104 | |
| 665 | 105 static Charbpos |
| 106 find_defun_start (struct buffer *buf, Charbpos pos) | |
| 428 | 107 { |
| 665 | 108 Charbpos tem; |
| 826 | 109 struct syntax_cache *scache; |
| 110 | |
| 428 | 111 /* Use previous finding, if it's valid and applies to this inquiry. */ |
| 112 if (buf == find_start_buffer | |
| 113 /* Reuse the defun-start even if POS is a little farther on. | |
| 114 POS might be in the next defun, but that's ok. | |
| 115 Our value may not be the best possible, but will still be usable. */ | |
| 116 && pos <= find_start_pos + 1000 | |
| 117 && pos >= find_start_value | |
| 118 && BUF_BEGV (buf) == find_start_begv | |
| 119 && BUF_MODIFF (buf) == find_start_modiff) | |
| 120 return find_start_value; | |
| 121 | |
| 122 /* Back up to start of line. */ | |
| 123 tem = find_next_newline (buf, pos, -1); | |
| 124 | |
| 826 | 125 scache = setup_buffer_syntax_cache (buf, tem, 1); |
| 428 | 126 while (tem > BUF_BEGV (buf)) |
| 127 { | |
| 826 | 128 UPDATE_SYNTAX_CACHE_BACKWARD (scache, tem); |
| 460 | 129 |
| 428 | 130 /* Open-paren at start of line means we found our defun-start. */ |
| 826 | 131 if (SYNTAX_FROM_CACHE (scache, BUF_FETCH_CHAR (buf, tem)) == Sopen) |
| 428 | 132 break; |
| 133 /* Move to beg of previous line. */ | |
| 134 tem = find_next_newline (buf, tem, -2); | |
| 135 } | |
| 136 | |
| 137 /* Record what we found, for the next try. */ | |
| 138 find_start_value = tem; | |
| 139 find_start_buffer = buf; | |
| 140 find_start_modiff = BUF_MODIFF (buf); | |
| 141 find_start_begv = BUF_BEGV (buf); | |
| 142 find_start_pos = pos; | |
| 143 | |
| 144 return find_start_value; | |
| 145 } | |
| 146 | |
| 147 DEFUN ("syntax-table-p", Fsyntax_table_p, 1, 1, 0, /* | |
| 444 | 148 Return t if OBJECT is a syntax table. |
| 428 | 149 */ |
| 444 | 150 (object)) |
| 428 | 151 { |
| 444 | 152 return (CHAR_TABLEP (object) |
| 153 && XCHAR_TABLE_TYPE (object) == CHAR_TABLE_TYPE_SYNTAX) | |
| 428 | 154 ? Qt : Qnil; |
| 155 } | |
| 156 | |
| 157 static Lisp_Object | |
| 158 check_syntax_table (Lisp_Object obj, Lisp_Object default_) | |
| 159 { | |
| 160 if (NILP (obj)) | |
| 161 obj = default_; | |
| 162 while (NILP (Fsyntax_table_p (obj))) | |
| 163 obj = wrong_type_argument (Qsyntax_table_p, obj); | |
| 164 return obj; | |
| 165 } | |
| 166 | |
| 167 DEFUN ("syntax-table", Fsyntax_table, 0, 1, 0, /* | |
| 168 Return the current syntax table. | |
| 169 This is the one specified by the current buffer, or by BUFFER if it | |
| 170 is non-nil. | |
| 171 */ | |
| 172 (buffer)) | |
| 173 { | |
| 174 return decode_buffer (buffer, 0)->syntax_table; | |
| 175 } | |
| 176 | |
| 826 | 177 #ifdef DEBUG_XEMACS |
| 178 | |
| 179 DEFUN ("mirror-syntax-table", Fmirror_syntax_table, 0, 1, 0, /* | |
| 180 Return the current mirror syntax table, for debugging purposes. | |
| 181 This is the one specified by the current buffer, or by BUFFER if it | |
| 182 is non-nil. | |
| 183 */ | |
| 184 (buffer)) | |
| 185 { | |
| 186 return decode_buffer (buffer, 0)->mirror_syntax_table; | |
| 187 } | |
| 188 | |
| 189 DEFUN ("syntax-cache-info", Fsyntax_cache_info, 0, 1, 0, /* | |
| 190 Return info about the syntax cache in BUFFER. | |
| 191 BUFFER defaults to the current buffer if nil. | |
| 192 */ | |
| 193 (buffer)) | |
| 194 { | |
| 195 struct buffer *buf = decode_buffer (buffer, 0); | |
| 196 struct syntax_cache *cache = buf->syntax_cache; | |
| 197 return list4 (cache->start, cache->end, make_int (cache->prev_change), | |
| 198 make_int (cache->next_change)); | |
| 199 } | |
| 200 | |
| 201 #endif /* DEBUG_XEMACS */ | |
| 202 | |
| 428 | 203 DEFUN ("standard-syntax-table", Fstandard_syntax_table, 0, 0, 0, /* |
| 204 Return the standard syntax table. | |
| 205 This is the one used for new buffers. | |
| 206 */ | |
| 207 ()) | |
| 208 { | |
| 209 return Vstandard_syntax_table; | |
| 210 } | |
| 211 | |
| 212 DEFUN ("copy-syntax-table", Fcopy_syntax_table, 0, 1, 0, /* | |
| 444 | 213 Return a new syntax table which is a copy of SYNTAX-TABLE. |
| 214 SYNTAX-TABLE defaults to the standard syntax table. | |
| 428 | 215 */ |
| 444 | 216 (syntax_table)) |
| 428 | 217 { |
| 218 if (NILP (Vstandard_syntax_table)) | |
| 219 return Fmake_char_table (Qsyntax); | |
| 220 | |
| 444 | 221 syntax_table = check_syntax_table (syntax_table, Vstandard_syntax_table); |
| 222 return Fcopy_char_table (syntax_table); | |
| 428 | 223 } |
| 224 | |
| 225 DEFUN ("set-syntax-table", Fset_syntax_table, 1, 2, 0, /* | |
| 444 | 226 Select SYNTAX-TABLE as the new syntax table for BUFFER. |
| 428 | 227 BUFFER defaults to the current buffer if omitted. |
| 228 */ | |
| 444 | 229 (syntax_table, buffer)) |
| 428 | 230 { |
| 231 struct buffer *buf = decode_buffer (buffer, 0); | |
| 444 | 232 syntax_table = check_syntax_table (syntax_table, Qnil); |
| 233 buf->syntax_table = syntax_table; | |
| 234 buf->mirror_syntax_table = XCHAR_TABLE (syntax_table)->mirror_table; | |
| 826 | 235 syntax_cache_table_was_changed (buf); |
| 428 | 236 /* Indicate that this buffer now has a specified syntax table. */ |
| 237 buf->local_var_flags |= XINT (buffer_local_flags.syntax_table); | |
| 444 | 238 return syntax_table; |
| 428 | 239 } |
| 3252 | 240 |
| 241 | |
| 428 | 242 |
| 3252 | 243 /* |
| 244 * Syntax caching | |
| 245 */ | |
| 246 | |
| 247 /* syntax_cache object implementation */ | |
| 248 | |
| 249 static const struct memory_description syntax_cache_description_1 [] = { | |
| 250 { XD_LISP_OBJECT, offsetof (struct syntax_cache, object) }, | |
| 251 { XD_LISP_OBJECT, offsetof (struct syntax_cache, buffer) }, | |
| 252 { XD_LISP_OBJECT, offsetof (struct syntax_cache, syntax_table) }, | |
| 253 { XD_LISP_OBJECT, offsetof (struct syntax_cache, mirror_table) }, | |
| 254 { XD_LISP_OBJECT, offsetof (struct syntax_cache, start) }, | |
| 255 { XD_LISP_OBJECT, offsetof (struct syntax_cache, end) }, | |
| 256 { XD_END } | |
| 257 }; | |
| 258 | |
| 259 #ifdef NEW_GC | |
| 260 DEFINE_LRECORD_IMPLEMENTATION ("syntax-cache", syntax_cache, | |
| 261 1, /*dumpable-flag*/ | |
| 262 0, 0, 0, 0, 0, | |
| 263 syntax_cache_description_1, | |
| 264 Lisp_Syntax_Cache); | |
| 265 #else /* not NEW_GC */ | |
| 266 | |
| 267 const struct sized_memory_description syntax_cache_description = { | |
| 268 sizeof (struct syntax_cache), | |
| 269 syntax_cache_description_1 | |
| 270 }; | |
| 271 #endif /* not NEW_GC */ | |
| 272 | |
| 273 /* static syntax cache utilities */ | |
| 274 | |
| 275 static void | |
| 276 syntax_cache_table_was_changed (struct buffer *buf) | |
| 277 { | |
| 278 struct syntax_cache *cache = buf->syntax_cache; | |
| 279 if (cache->no_syntax_table_prop) | |
| 280 { | |
| 281 cache->syntax_table = | |
| 282 BUFFER_SYNTAX_TABLE (buf); | |
| 283 cache->mirror_table = | |
| 284 BUFFER_MIRROR_SYNTAX_TABLE (buf); | |
| 285 } | |
| 286 } | |
| 287 | |
| 288 static void | |
| 289 reset_buffer_syntax_cache_range (struct syntax_cache *cache, | |
| 290 Lisp_Object buffer, int infinite) | |
| 291 { | |
| 292 Fset_marker (cache->start, make_int (1), buffer); | |
| 293 Fset_marker (cache->end, make_int (1), buffer); | |
| 294 Fset_marker_insertion_type (cache->start, Qt); | |
| 295 Fset_marker_insertion_type (cache->end, Qnil); | |
| 296 /* #### Should we "cache->no_syntax_table_prop = 1;" here? */ | |
| 297 /* #### Cf comment on INFINITE in init_syntax_cache. -- sjt */ | |
| 298 if (infinite) | |
| 299 { | |
| 300 cache->prev_change = EMACS_INT_MIN; | |
| 301 cache->next_change = EMACS_INT_MAX; | |
| 302 } | |
| 303 else | |
| 304 { | |
| 305 cache->prev_change = -1; | |
| 306 cache->next_change = -1; | |
| 307 } | |
| 308 } | |
| 826 | 309 |
| 310 static void | |
| 311 init_syntax_cache (struct syntax_cache *cache, Lisp_Object object, | |
| 312 struct buffer *buffer, int infinite) | |
| 313 { | |
| 314 xzero (*cache); | |
| 315 cache->object = object; | |
| 316 cache->buffer = buffer; | |
| 317 cache->no_syntax_table_prop = 1; | |
| 1296 | 318 cache->syntax_table = |
| 319 BUFFER_SYNTAX_TABLE (cache->buffer); | |
| 320 cache->mirror_table = | |
| 826 | 321 BUFFER_MIRROR_SYNTAX_TABLE (cache->buffer); |
| 322 cache->start = Qnil; | |
| 323 cache->end = Qnil; | |
| 3250 | 324 /* #### I'm not sure what INFINITE is for, but it's apparently needed by |
| 325 setup_syntax_cache(). It looks like it's supposed to guarantee that | |
| 326 the test for POS outside of cache-valid range will never succeed, so | |
| 327 that update_syntax_cache won't get called, but it's hard to be sure. | |
| 328 Cf reset_buffer_syntax_cache_range. -- sjt */ | |
| 826 | 329 if (infinite) |
| 330 { | |
| 331 cache->prev_change = EMACS_INT_MIN; | |
| 332 cache->next_change = EMACS_INT_MAX; | |
| 333 } | |
| 334 else | |
| 335 { | |
| 336 cache->prev_change = -1; | |
| 337 cache->next_change = -1; | |
| 338 } | |
| 339 } | |
| 340 | |
| 3252 | 341 /* external syntax cache API */ |
| 342 | |
| 3250 | 343 /* #### This function and associated logic still needs work, and especially |
| 344 documentation. */ | |
| 345 struct syntax_cache * /* return CACHE or the cache of OBJECT */ | |
| 346 setup_syntax_cache (struct syntax_cache *cache, /* syntax cache, may be NULL | |
| 347 if OBJECT is a buffer */ | |
| 348 Lisp_Object object, /* the object (if any) cache | |
| 349 is associated with */ | |
| 350 struct buffer *buffer, /* the buffer to use as source | |
| 351 of the syntax table */ | |
| 352 Charxpos from, /* initial position of cache */ | |
| 353 int count) /* direction? see code */ | |
| 826 | 354 { |
| 3250 | 355 /* If OBJECT is a buffer, use its cache. Initialize cache. Make it valid |
| 356 for the whole buffer if the syntax-table property is not being respected. | |
| 357 Else if OBJECT is not a buffer, initialize the cache passed in CACHE. | |
| 358 If the syntax-table property is being respected, update the cache. */ | |
| 826 | 359 if (BUFFERP (object)) |
| 3250 | 360 { |
| 361 cache = XBUFFER (object)->syntax_cache; | |
| 362 if (!lookup_syntax_properties) | |
| 363 reset_buffer_syntax_cache_range (cache, object, 1); | |
| 364 } | |
| 365 else | |
| 826 | 366 init_syntax_cache (cache, object, buffer, 0); |
| 367 if (lookup_syntax_properties) | |
| 368 { | |
| 369 if (count <= 0) | |
| 370 { | |
| 371 from--; | |
| 2167 | 372 from = buffer_or_string_clip_to_accessible_char (cache->object, |
| 826 | 373 from); |
| 374 } | |
| 375 if (!(from >= cache->prev_change && from < cache->next_change)) | |
| 376 update_syntax_cache (cache, from, count); | |
| 377 } | |
| 1296 | 378 #ifdef NOT_WORTH_THE_EFFORT |
| 379 update_mirror_syntax_if_dirty (cache->mirror_table); | |
| 380 #endif /* NOT_WORTH_THE_EFFORT */ | |
| 826 | 381 return cache; |
| 382 } | |
| 383 | |
| 384 struct syntax_cache * | |
| 385 setup_buffer_syntax_cache (struct buffer *buffer, Charxpos from, int count) | |
| 386 { | |
| 387 return setup_syntax_cache (NULL, wrap_buffer (buffer), buffer, from, count); | |
| 388 } | |
| 389 | |
| 460 | 390 /* |
| 391 Update syntax_cache to an appropriate setting for position POS | |
| 392 | |
| 393 The sign of COUNT gives the relative position of POS wrt the | |
| 394 previously valid interval. (not currently used) | |
| 395 | |
| 396 `syntax_cache.*_change' are the next and previous positions at | |
| 397 which syntax_code and c_s_t will need to be recalculated. | |
| 398 | |
| 3025 | 399 #### Currently this code uses `get-char-property', which will |
| 460 | 400 return the "last smallest" extent at a given position. In cases |
| 401 where overlapping extents are defined, this code will simply use | |
| 402 whatever is returned by get-char-property. | |
| 403 | |
| 404 It might be worth it at some point to merge provided syntax tables | |
| 826 | 405 outward to the current buffer (#### rewrite in English please?!). */ |
| 460 | 406 |
| 407 void | |
| 2286 | 408 update_syntax_cache (struct syntax_cache *cache, Charxpos cpos, |
| 409 int UNUSED (count)) | |
| 460 | 410 { |
| 411 Lisp_Object tmp_table; | |
| 826 | 412 Bytexpos pos; |
| 413 Bytexpos lim; | |
| 414 Bytexpos next, prev; | |
| 415 int at_begin = 0, at_end = 0; | |
| 460 | 416 |
| 826 | 417 if (NILP (cache->object)) |
| 418 return; | |
| 419 | |
| 420 pos = buffer_or_string_charxpos_to_bytexpos (cache->object, cpos); | |
| 421 | |
| 422 tmp_table = get_char_property (pos, Qsyntax_table, cache->object, | |
| 423 EXTENT_AT_AFTER, 0); | |
| 2506 | 424 lim = next_previous_single_property_change (pos, Qsyntax_table, |
| 425 cache->object, -1, 1, 0); | |
| 826 | 426 if (lim < 0) |
| 460 | 427 { |
| 826 | 428 next = buffer_or_string_absolute_end_byte (cache->object); |
| 429 at_begin = 1; | |
| 460 | 430 } |
| 826 | 431 else |
| 432 next = lim; | |
| 460 | 433 |
| 826 | 434 if (pos < buffer_or_string_absolute_end_byte (cache->object)) |
| 435 pos = next_bytexpos (cache->object, pos); | |
| 2506 | 436 lim = next_previous_single_property_change (pos, Qsyntax_table, |
| 437 cache->object, -1, 0, 0); | |
| 826 | 438 if (lim < 0) |
| 460 | 439 { |
| 826 | 440 prev = buffer_or_string_absolute_begin_byte (cache->object); |
| 441 at_end = 1; | |
| 460 | 442 } |
| 443 else | |
| 826 | 444 prev = lim; |
| 460 | 445 |
| 826 | 446 cache->prev_change = |
| 447 buffer_or_string_bytexpos_to_charxpos (cache->object, prev); | |
| 448 cache->next_change = | |
| 449 buffer_or_string_bytexpos_to_charxpos (cache->object, next); | |
| 460 | 450 |
| 826 | 451 if (BUFFERP (cache->object)) |
| 452 { | |
| 453 /* If we are at the beginning or end of buffer, check to see if there's | |
| 454 a zero-length `syntax-table' extent there (highly unlikely); if not, | |
| 455 then we can safely make the end closed, so it will take in newly | |
| 456 inserted text. (If such an extent is inserted, we will be informed | |
| 3250 | 457 through signal_syntax_cache_extent_changed().) */ |
| 826 | 458 Fset_marker (cache->start, make_int (cache->prev_change), cache->object); |
| 459 Fset_marker_insertion_type | |
| 460 (cache->start, | |
| 461 at_begin && NILP (extent_at (prev, cache->object, Qsyntax_table, | |
| 462 NULL, EXTENT_AT_AT, 0)) | |
| 463 ? Qnil : Qt); | |
| 464 Fset_marker (cache->end, make_int (cache->next_change), cache->object); | |
| 465 Fset_marker_insertion_type | |
| 466 (cache->end, | |
| 467 at_end && NILP (extent_at (next, cache->object, Qsyntax_table, | |
| 468 NULL, EXTENT_AT_AT, 0)) | |
| 469 ? Qt : Qnil); | |
| 470 } | |
| 471 | |
| 472 if (!NILP (Fsyntax_table_p (tmp_table))) | |
| 473 { | |
| 474 cache->use_code = 0; | |
| 1296 | 475 cache->syntax_table = tmp_table; |
| 476 cache->mirror_table = XCHAR_TABLE (tmp_table)->mirror_table; | |
| 826 | 477 cache->no_syntax_table_prop = 0; |
| 1296 | 478 #ifdef NOT_WORTH_THE_EFFORT |
| 479 update_mirror_syntax_if_dirty (cache->mirror_table); | |
| 480 #endif /* NOT_WORTH_THE_EFFORT */ | |
| 826 | 481 } |
| 482 else if (CONSP (tmp_table) && INTP (XCAR (tmp_table))) | |
| 483 { | |
| 484 cache->use_code = 1; | |
| 485 cache->syntax_code = XINT (XCAR (tmp_table)); | |
| 486 cache->no_syntax_table_prop = 0; | |
| 487 } | |
| 488 else | |
| 489 { | |
| 490 cache->use_code = 0; | |
| 491 cache->no_syntax_table_prop = 1; | |
| 1296 | 492 cache->syntax_table = BUFFER_SYNTAX_TABLE (cache->buffer); |
| 493 cache->mirror_table = BUFFER_MIRROR_SYNTAX_TABLE (cache->buffer); | |
| 494 #ifdef NOT_WORTH_THE_EFFORT | |
| 495 update_mirror_syntax_if_dirty (cache->mirror_table); | |
| 496 #endif /* NOT_WORTH_THE_EFFORT */ | |
| 460 | 497 } |
| 498 } | |
| 3252 | 499 |
| 500 /* buffer-specific APIs used in buffer.c | |
| 501 #### This is really unclean; | |
| 502 the syntax cache should just be a LISP object */ | |
| 503 | |
| 504 void | |
| 505 mark_buffer_syntax_cache (struct buffer *buf) | |
| 506 { | |
| 507 struct syntax_cache *cache = buf->syntax_cache; | |
| 508 if (!cache) /* Vbuffer_defaults and such don't have caches */ | |
| 509 return; | |
| 510 mark_object (cache->object); | |
| 511 if (cache->buffer) | |
| 512 mark_object (wrap_buffer (cache->buffer)); | |
| 513 mark_object (cache->syntax_table); | |
| 514 mark_object (cache->mirror_table); | |
| 515 mark_object (cache->start); | |
| 516 mark_object (cache->end); | |
| 517 } | |
| 518 | |
| 519 void | |
| 520 init_buffer_syntax_cache (struct buffer *buf) | |
| 521 { | |
| 522 struct syntax_cache *cache; | |
| 523 #ifdef NEW_GC | |
| 524 buf->syntax_cache = alloc_lrecord_type (struct syntax_cache, | |
| 525 &lrecord_syntax_cache); | |
| 526 #else /* not NEW_GC */ | |
| 527 buf->syntax_cache = xnew_and_zero (struct syntax_cache); | |
| 528 #endif /* not NEW_GC */ | |
| 529 cache = buf->syntax_cache; | |
| 530 cache->object = wrap_buffer (buf); | |
| 531 cache->buffer = buf; | |
| 532 cache->no_syntax_table_prop = 1; | |
| 533 cache->syntax_table = BUFFER_SYNTAX_TABLE (cache->buffer); | |
| 534 cache->mirror_table = BUFFER_MIRROR_SYNTAX_TABLE (cache->buffer); | |
| 535 cache->start = Fmake_marker (); | |
| 536 cache->end = Fmake_marker (); | |
| 537 reset_buffer_syntax_cache_range (cache, cache->object, 0); | |
| 538 } | |
| 539 | |
| 540 /* finalize the syntax cache for BUF */ | |
| 541 | |
| 542 void | |
| 543 uninit_buffer_syntax_cache (struct buffer *buf) | |
| 544 { | |
| 4141 | 545 #ifndef NEW_GC |
| 3252 | 546 xfree (buf->syntax_cache, struct syntax_cache *); |
| 547 buf->syntax_cache = 0; | |
| 4141 | 548 #endif /* not NEW_GC */ |
| 3252 | 549 } |
| 550 | |
| 551 /* extent-specific APIs used in extents.c and insdel.c */ | |
| 552 | |
| 553 /* The syntax-table property on the range covered by EXTENT may be changing, | |
| 554 either because EXTENT has a syntax-table property and is being attached | |
| 555 or detached (this includes having its endpoints changed), or because | |
| 556 the value of EXTENT's syntax-table property is changing. */ | |
| 557 | |
| 558 void | |
| 559 signal_syntax_cache_extent_changed (EXTENT extent) | |
| 560 { | |
| 561 Lisp_Object buffer = Fextent_object (wrap_extent (extent)); | |
| 562 if (BUFFERP (buffer)) | |
| 563 { | |
| 564 /* This was getting called with the buffer's start and end null, eg in | |
| 565 cperl mode, which triggers an assert in byte_marker_position. Cf | |
| 566 thread rooted at <yxz7j7xzk97.fsf@gimli.holgi.priv> on xemacs-beta. | |
| 567 <yxzfymklb6p.fsf@gimli.holgi.priv> has a recipe, but you also need | |
| 568 to delete or type SPC to get the crash. | |
| 569 #### Delete this comment when setup_syntax_cache is made sane. */ | |
| 570 struct syntax_cache *cache = XBUFFER (buffer)->syntax_cache; | |
| 571 /* #### would this be slower or less accurate in character terms? */ | |
| 572 Bytexpos start = extent_endpoint_byte (extent, 0); | |
| 573 Bytexpos end = extent_endpoint_byte (extent, 1); | |
| 574 Bytexpos start2 = byte_marker_position (cache->start); | |
| 575 Bytexpos end2 = byte_marker_position (cache->end); | |
| 576 /* If the extent is entirely before or entirely after the cache | |
| 577 range, it doesn't overlap. Otherwise, invalidate the range. */ | |
| 578 if (!(end < start2 || start > end2)) | |
| 579 reset_buffer_syntax_cache_range (cache, buffer, 0); | |
| 580 } | |
| 581 } | |
| 582 | |
| 583 /* Extents have been adjusted for insertion or deletion, so we need to | |
| 584 refetch the start and end position of the extent */ | |
| 585 void | |
| 586 signal_syntax_cache_extent_adjust (struct buffer *buf) | |
| 587 { | |
| 588 struct syntax_cache *cache = buf->syntax_cache; | |
| 589 /* If the cache was invalid before, leave it that way. We only want | |
| 590 to update the limits of validity when they were actually valid. */ | |
| 591 if (cache->prev_change < 0) | |
| 592 return; | |
| 593 cache->prev_change = marker_position (cache->start); | |
| 594 cache->next_change = marker_position (cache->end); | |
| 595 } | |
| 596 | |
| 597 | |
| 460 | 598 |
| 428 | 599 /* Convert a letter which signifies a syntax code |
| 600 into the code it signifies. | |
| 601 This is used by modify-syntax-entry, and other things. */ | |
| 602 | |
| 442 | 603 const unsigned char syntax_spec_code[0400] = |
| 428 | 604 { 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, |
| 605 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
| 606 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
| 607 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
| 608 (char) Swhitespace, 0377, (char) Sstring, 0377, | |
| 609 (char) Smath, 0377, 0377, (char) Squote, | |
| 610 (char) Sopen, (char) Sclose, 0377, 0377, | |
| 611 0377, (char) Swhitespace, (char) Spunct, (char) Scharquote, | |
| 612 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
| 613 0377, 0377, 0377, 0377, | |
| 614 (char) Scomment, 0377, (char) Sendcomment, 0377, | |
| 615 (char) Sinherit, 0377, 0377, 0377, 0377, 0377, 0377, 0377, /* @, A ... */ | |
| 616 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
| 617 0377, 0377, 0377, 0377, 0377, 0377, 0377, (char) Sword, | |
| 618 0377, 0377, 0377, 0377, (char) Sescape, 0377, 0377, (char) Ssymbol, | |
| 619 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, /* `, a, ... */ | |
| 620 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
| 621 0377, 0377, 0377, 0377, 0377, 0377, 0377, (char) Sword, | |
| 460 | 622 0377, 0377, 0377, 0377, (char) Sstring_fence, 0377, 0377, 0377 |
| 428 | 623 }; |
| 624 | |
| 460 | 625 const unsigned char syntax_code_spec[] = " .w_()'\"$\\/<>@!|"; |
| 428 | 626 |
| 627 DEFUN ("syntax-designator-chars", Fsyntax_designator_chars, 0, 0, 0, /* | |
| 628 Return a string of the recognized syntax designator chars. | |
| 629 The chars are ordered by their internal syntax codes, which are | |
| 630 numbered starting at 0. | |
| 631 */ | |
| 632 ()) | |
| 633 { | |
| 634 return Vsyntax_designator_chars_string; | |
| 635 } | |
| 636 | |
| 637 DEFUN ("char-syntax", Fchar_syntax, 1, 2, 0, /* | |
| 444 | 638 Return the syntax code of CHARACTER, described by a character. |
| 639 For example, if CHARACTER is a word constituent, | |
| 640 the character `?w' is returned. | |
| 428 | 641 The characters that correspond to various syntax codes |
| 642 are listed in the documentation of `modify-syntax-entry'. | |
| 444 | 643 Optional second argument SYNTAX-TABLE defaults to the current buffer's |
| 428 | 644 syntax table. |
| 645 */ | |
| 444 | 646 (character, syntax_table)) |
| 428 | 647 { |
| 826 | 648 Lisp_Object mirrortab; |
| 428 | 649 |
| 444 | 650 if (NILP (character)) |
| 428 | 651 { |
| 444 | 652 character = make_char ('\000'); |
| 428 | 653 } |
| 444 | 654 CHECK_CHAR_COERCE_INT (character); |
| 826 | 655 syntax_table = check_syntax_table (syntax_table, |
| 656 current_buffer->syntax_table); | |
| 657 mirrortab = XCHAR_TABLE (syntax_table)->mirror_table; | |
| 658 return make_char (syntax_code_spec[(int) SYNTAX (mirrortab, | |
| 659 XCHAR (character))]); | |
| 428 | 660 } |
| 661 | |
| 662 #ifdef MULE | |
| 663 | |
| 664 enum syntaxcode | |
| 2286 | 665 charset_syntax (struct buffer *UNUSED (buf), Lisp_Object UNUSED (charset), |
| 666 int *multi_p_out) | |
| 428 | 667 { |
| 668 *multi_p_out = 1; | |
| 826 | 669 /* !!#### get this right */ |
| 3152 | 670 return Sword; |
| 428 | 671 } |
| 672 | |
| 673 #endif | |
| 674 | |
| 675 Lisp_Object | |
| 867 | 676 syntax_match (Lisp_Object syntax_table, Ichar ch) |
| 428 | 677 { |
| 826 | 678 Lisp_Object code = get_char_table (ch, syntax_table); |
| 428 | 679 Lisp_Object code2 = code; |
| 680 | |
| 681 if (CONSP (code)) | |
| 682 code2 = XCAR (code); | |
| 683 if (SYNTAX_FROM_CODE (XINT (code2)) == Sinherit) | |
| 826 | 684 code = get_char_table (ch, Vstandard_syntax_table); |
| 428 | 685 |
| 686 return CONSP (code) ? XCDR (code) : Qnil; | |
| 687 } | |
| 688 | |
| 689 DEFUN ("matching-paren", Fmatching_paren, 1, 2, 0, /* | |
| 444 | 690 Return the matching parenthesis of CHARACTER, or nil if none. |
| 691 Optional second argument SYNTAX-TABLE defaults to the current buffer's | |
| 428 | 692 syntax table. |
| 693 */ | |
| 444 | 694 (character, syntax_table)) |
| 428 | 695 { |
| 826 | 696 Lisp_Object mirrortab; |
| 1315 | 697 enum syntaxcode code; |
| 428 | 698 |
| 444 | 699 CHECK_CHAR_COERCE_INT (character); |
| 826 | 700 syntax_table = check_syntax_table (syntax_table, |
| 701 current_buffer->syntax_table); | |
| 702 mirrortab = XCHAR_TABLE (syntax_table)->mirror_table; | |
| 444 | 703 code = SYNTAX (mirrortab, XCHAR (character)); |
| 428 | 704 if (code == Sopen || code == Sclose || code == Sstring) |
| 444 | 705 return syntax_match (syntax_table, XCHAR (character)); |
| 428 | 706 return Qnil; |
| 707 } | |
| 708 | |
| 709 | |
| 710 | |
| 711 #ifdef MULE | |
| 712 /* Return 1 if there is a word boundary between two word-constituent | |
| 713 characters C1 and C2 if they appear in this order, else return 0. | |
| 714 There is no word boundary between two word-constituent ASCII | |
| 715 characters. */ | |
| 716 #define WORD_BOUNDARY_P(c1, c2) \ | |
| 867 | 717 (!(ichar_ascii_p (c1) && ichar_ascii_p (c2)) \ |
| 428 | 718 && word_boundary_p (c1, c2)) |
| 719 #endif | |
| 720 | |
| 721 /* Return the position across COUNT words from FROM. | |
| 722 If that many words cannot be found before the end of the buffer, return 0. | |
| 723 COUNT negative means scan backward and stop at word beginning. */ | |
| 724 | |
| 665 | 725 Charbpos |
| 726 scan_words (struct buffer *buf, Charbpos from, int count) | |
| 428 | 727 { |
| 665 | 728 Charbpos limit = count > 0 ? BUF_ZV (buf) : BUF_BEGV (buf); |
| 867 | 729 Ichar ch0, ch1; |
| 428 | 730 enum syntaxcode code; |
| 826 | 731 struct syntax_cache *scache = setup_buffer_syntax_cache (buf, from, count); |
| 460 | 732 |
| 428 | 733 /* #### is it really worth it to hand expand both cases? JV */ |
| 734 while (count > 0) | |
| 735 { | |
| 736 QUIT; | |
| 737 | |
| 738 while (1) | |
| 739 { | |
| 740 if (from == limit) | |
| 741 return 0; | |
| 742 | |
| 826 | 743 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 428 | 744 ch0 = BUF_FETCH_CHAR (buf, from); |
| 826 | 745 code = SYNTAX_FROM_CACHE (scache, ch0); |
| 428 | 746 |
| 442 | 747 from++; |
| 428 | 748 if (words_include_escapes |
| 749 && (code == Sescape || code == Scharquote)) | |
| 750 break; | |
| 751 if (code == Sword) | |
| 752 break; | |
| 753 } | |
| 754 | |
| 755 QUIT; | |
| 756 | |
| 757 while (from != limit) | |
| 758 { | |
| 826 | 759 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 428 | 760 ch1 = BUF_FETCH_CHAR (buf, from); |
| 826 | 761 code = SYNTAX_FROM_CACHE (scache, ch1); |
| 428 | 762 if (!(words_include_escapes |
| 763 && (code == Sescape || code == Scharquote))) | |
| 764 if (code != Sword | |
| 765 #ifdef MULE | |
| 766 || WORD_BOUNDARY_P (ch0, ch1) | |
| 434 | 767 #endif |
| 428 | 768 ) |
| 769 break; | |
| 770 #ifdef MULE | |
| 771 ch0 = ch1; | |
| 434 | 772 #endif |
| 428 | 773 from++; |
| 774 } | |
| 775 count--; | |
| 776 } | |
| 777 | |
| 778 while (count < 0) | |
| 779 { | |
| 780 QUIT; | |
| 781 | |
| 782 while (1) | |
| 783 { | |
| 784 if (from == limit) | |
| 785 return 0; | |
| 786 | |
| 826 | 787 UPDATE_SYNTAX_CACHE_BACKWARD (scache, from - 1); |
| 428 | 788 ch1 = BUF_FETCH_CHAR (buf, from - 1); |
| 826 | 789 code = SYNTAX_FROM_CACHE (scache, ch1); |
| 460 | 790 from--; |
| 442 | 791 |
| 428 | 792 if (words_include_escapes |
| 793 && (code == Sescape || code == Scharquote)) | |
| 794 break; | |
| 795 if (code == Sword) | |
| 796 break; | |
| 797 } | |
| 798 | |
| 799 QUIT; | |
| 800 | |
| 801 while (from != limit) | |
| 802 { | |
| 826 | 803 UPDATE_SYNTAX_CACHE_BACKWARD (scache, from - 1); |
| 428 | 804 ch0 = BUF_FETCH_CHAR (buf, from - 1); |
| 826 | 805 code = SYNTAX_FROM_CACHE (scache, ch0); |
| 460 | 806 |
| 428 | 807 if (!(words_include_escapes |
| 808 && (code == Sescape || code == Scharquote))) | |
| 809 if (code != Sword | |
| 810 #ifdef MULE | |
| 811 || WORD_BOUNDARY_P (ch0, ch1) | |
| 812 #endif | |
| 813 ) | |
| 814 break; | |
| 815 #ifdef MULE | |
| 816 ch1 = ch0; | |
| 817 #endif | |
| 818 from--; | |
| 819 } | |
| 820 count++; | |
| 821 } | |
| 822 | |
| 823 return from; | |
| 824 } | |
| 825 | |
| 446 | 826 DEFUN ("forward-word", Fforward_word, 0, 2, "_p", /* |
| 428 | 827 Move point forward COUNT words (backward if COUNT is negative). |
| 446 | 828 Normally t is returned, but if an edge of the buffer is reached, |
| 829 point is left there and nil is returned. | |
| 428 | 830 |
| 462 | 831 The characters that are moved over may be added to the current selection |
| 832 \(i.e. active region) if the Shift key is held down, a motion key is used | |
| 833 to invoke this command, and `shifted-motion-keys-select-region' is t; see | |
| 834 the documentation for this variable for more details. | |
| 835 | |
| 446 | 836 COUNT defaults to 1, and BUFFER defaults to the current buffer. |
| 428 | 837 */ |
| 838 (count, buffer)) | |
| 839 { | |
| 665 | 840 Charbpos val; |
| 428 | 841 struct buffer *buf = decode_buffer (buffer, 0); |
| 446 | 842 EMACS_INT n; |
| 843 | |
| 844 if (NILP (count)) | |
| 845 n = 1; | |
| 846 else | |
| 847 { | |
| 848 CHECK_INT (count); | |
| 849 n = XINT (count); | |
| 850 } | |
| 428 | 851 |
| 446 | 852 val = scan_words (buf, BUF_PT (buf), n); |
| 853 if (val) | |
| 428 | 854 { |
| 446 | 855 BUF_SET_PT (buf, val); |
| 856 return Qt; | |
| 857 } | |
| 858 else | |
| 859 { | |
| 860 BUF_SET_PT (buf, n > 0 ? BUF_ZV (buf) : BUF_BEGV (buf)); | |
| 428 | 861 return Qnil; |
| 862 } | |
| 863 } | |
| 864 | |
| 865 static void scan_sexps_forward (struct buffer *buf, | |
| 866 struct lisp_parse_state *, | |
| 665 | 867 Charbpos from, Charbpos end, |
| 428 | 868 int targetdepth, int stopbefore, |
| 869 Lisp_Object oldstate, | |
| 870 int commentstop); | |
| 871 | |
| 872 static int | |
| 665 | 873 find_start_of_comment (struct buffer *buf, Charbpos from, Charbpos stop, |
| 460 | 874 int comstyle) |
| 428 | 875 { |
| 867 | 876 Ichar c; |
| 428 | 877 enum syntaxcode code; |
| 878 | |
| 879 /* Look back, counting the parity of string-quotes, | |
| 880 and recording the comment-starters seen. | |
| 881 When we reach a safe place, assume that's not in a string; | |
| 882 then step the main scan to the earliest comment-starter seen | |
| 883 an even number of string quotes away from the safe place. | |
| 884 | |
| 885 OFROM[I] is position of the earliest comment-starter seen | |
| 886 which is I+2X quotes from the comment-end. | |
| 887 PARITY is current parity of quotes from the comment end. */ | |
| 888 int parity = 0; | |
| 867 | 889 Ichar my_stringend = 0; |
| 428 | 890 int string_lossage = 0; |
| 665 | 891 Charbpos comment_end = from; |
| 892 Charbpos comstart_pos = 0; | |
| 428 | 893 int comstart_parity = 0; |
| 894 int styles_match_p = 0; | |
| 460 | 895 /* mask to match comment styles against; for ST_COMMENT_STYLE, this |
| 896 will get set to SYNTAX_COMMENT_STYLE_B, but never get checked */ | |
| 897 int mask = comstyle ? SYNTAX_COMMENT_STYLE_B : SYNTAX_COMMENT_STYLE_A; | |
| 826 | 898 struct syntax_cache *scache = buf->syntax_cache; |
| 428 | 899 |
| 900 /* At beginning of range to scan, we're outside of strings; | |
| 901 that determines quote parity to the comment-end. */ | |
| 902 while (from != stop) | |
| 903 { | |
| 460 | 904 int syncode; |
| 905 | |
| 428 | 906 /* Move back and examine a character. */ |
| 907 from--; | |
| 826 | 908 UPDATE_SYNTAX_CACHE_BACKWARD (scache, from); |
| 428 | 909 |
| 910 c = BUF_FETCH_CHAR (buf, from); | |
| 826 | 911 syncode = SYNTAX_CODE_FROM_CACHE (scache, c); |
| 912 code = SYNTAX_FROM_CODE (syncode); | |
| 428 | 913 |
| 914 /* is this a 1-char comment end sequence? if so, try | |
| 915 to see if style matches previously extracted mask */ | |
| 916 if (code == Sendcomment) | |
| 917 { | |
| 918 styles_match_p = | |
| 460 | 919 SYNTAX_CODE_COMMENT_1CHAR_MASK (syncode) & mask; |
| 428 | 920 } |
| 921 | |
| 922 /* or are we looking at a 1-char comment start sequence | |
| 923 of the style matching mask? */ | |
| 460 | 924 else if (code == Scomment) |
| 428 | 925 { |
| 460 | 926 styles_match_p = |
| 927 SYNTAX_CODE_COMMENT_1CHAR_MASK (syncode) & mask; | |
| 428 | 928 } |
| 929 | |
| 460 | 930 /* otherwise, is this a 2-char comment end or start sequence? */ |
| 931 else if (from > stop) | |
| 932 do | |
| 933 { | |
| 934 /* 2-char comment end sequence? */ | |
| 935 if (SYNTAX_CODE_END_SECOND_P (syncode)) | |
| 936 { | |
| 937 int prev_syncode; | |
| 826 | 938 UPDATE_SYNTAX_CACHE_BACKWARD (scache, from - 1); |
| 460 | 939 prev_syncode = |
| 1315 | 940 SYNTAX_CODE_FROM_CACHE (scache, |
| 941 BUF_FETCH_CHAR (buf, from - 1)); | |
| 460 | 942 |
| 943 if (SYNTAX_CODES_END_P (prev_syncode, syncode)) | |
| 944 { | |
| 945 code = Sendcomment; | |
| 946 styles_match_p = | |
| 826 | 947 SYNTAX_CODES_COMMENT_MASK_END (prev_syncode, |
| 948 syncode) & mask; | |
| 460 | 949 from--; |
| 826 | 950 UPDATE_SYNTAX_CACHE_BACKWARD (scache, from); |
| 460 | 951 c = BUF_FETCH_CHAR (buf, from); |
| 952 | |
| 953 /* Found a comment-end sequence, so skip past the | |
| 954 check for a comment-start */ | |
| 955 break; | |
| 956 } | |
| 957 } | |
| 958 | |
| 959 /* 2-char comment start sequence? */ | |
| 960 if (SYNTAX_CODE_START_SECOND_P (syncode)) | |
| 961 { | |
| 962 int prev_syncode; | |
| 826 | 963 UPDATE_SYNTAX_CACHE_BACKWARD (scache, from - 1); |
| 460 | 964 prev_syncode = |
| 1315 | 965 SYNTAX_CODE_FROM_CACHE (scache, |
| 966 BUF_FETCH_CHAR (buf, from - 1)); | |
| 460 | 967 |
| 968 if (SYNTAX_CODES_START_P (prev_syncode, syncode)) | |
| 969 { | |
| 970 code = Scomment; | |
| 971 styles_match_p = | |
| 826 | 972 SYNTAX_CODES_COMMENT_MASK_START (prev_syncode, |
| 973 syncode) & mask; | |
| 460 | 974 from--; |
| 826 | 975 UPDATE_SYNTAX_CACHE_BACKWARD (scache, from); |
| 460 | 976 c = BUF_FETCH_CHAR (buf, from); |
| 977 } | |
| 978 } | |
| 979 } while (0); | |
| 428 | 980 |
| 981 /* Ignore escaped characters. */ | |
| 982 if (char_quoted (buf, from)) | |
| 983 continue; | |
| 984 | |
| 985 /* Track parity of quotes. */ | |
| 986 if (code == Sstring) | |
| 987 { | |
| 988 parity ^= 1; | |
| 989 if (my_stringend == 0) | |
| 990 my_stringend = c; | |
| 991 /* If we have two kinds of string delimiters. | |
| 992 There's no way to grok this scanning backwards. */ | |
| 993 else if (my_stringend != c) | |
| 994 string_lossage = 1; | |
| 995 } | |
| 996 | |
| 460 | 997 if (code == Sstring_fence || code == Scomment_fence) |
| 998 { | |
| 999 parity ^= 1; | |
| 1000 if (my_stringend == 0) | |
| 1001 my_stringend = | |
| 1002 code == Sstring_fence ? ST_STRING_STYLE : ST_COMMENT_STYLE; | |
| 1003 /* If we have two kinds of string delimiters. | |
| 1004 There's no way to grok this scanning backwards. */ | |
| 1005 else if (my_stringend != (code == Sstring_fence | |
| 1006 ? ST_STRING_STYLE : ST_COMMENT_STYLE)) | |
| 1007 string_lossage = 1; | |
| 1008 } | |
| 1009 | |
| 428 | 1010 /* Record comment-starters according to that |
| 1011 quote-parity to the comment-end. */ | |
| 1012 if (code == Scomment && styles_match_p) | |
| 1013 { | |
| 1014 comstart_parity = parity; | |
| 1015 comstart_pos = from; | |
| 1016 } | |
| 1017 | |
| 1018 /* If we find another earlier comment-ender, | |
| 1019 any comment-starts earlier than that don't count | |
| 1020 (because they go with the earlier comment-ender). */ | |
| 1021 if (code == Sendcomment && styles_match_p) | |
| 1022 break; | |
| 1023 | |
| 1024 /* Assume a defun-start point is outside of strings. */ | |
| 1025 if (code == Sopen | |
| 1026 && (from == stop || BUF_FETCH_CHAR (buf, from - 1) == '\n')) | |
| 1027 break; | |
| 1028 } | |
| 1029 | |
| 1030 if (comstart_pos == 0) | |
| 1031 from = comment_end; | |
| 1032 /* If the earliest comment starter | |
| 1033 is followed by uniform paired string quotes or none, | |
| 1034 we know it can't be inside a string | |
| 1035 since if it were then the comment ender would be inside one. | |
| 1036 So it does start a comment. Skip back to it. */ | |
| 1037 else if (comstart_parity == 0 && !string_lossage) | |
| 1038 from = comstart_pos; | |
| 1039 else | |
| 1040 { | |
| 1041 /* We had two kinds of string delimiters mixed up | |
| 1042 together. Decode this going forwards. | |
| 1043 Scan fwd from the previous comment ender | |
| 1044 to the one in question; this records where we | |
| 1045 last passed a comment starter. */ | |
| 1046 | |
| 1047 struct lisp_parse_state state; | |
| 1048 scan_sexps_forward (buf, &state, find_defun_start (buf, comment_end), | |
| 1049 comment_end - 1, -10000, 0, Qnil, 0); | |
| 1050 if (state.incomment) | |
| 460 | 1051 from = state.comstr_start; |
| 428 | 1052 else |
| 1053 /* We can't grok this as a comment; scan it normally. */ | |
| 1054 from = comment_end; | |
| 826 | 1055 UPDATE_SYNTAX_CACHE_FORWARD (scache, from - 1); |
| 428 | 1056 } |
| 1057 return from; | |
| 1058 } | |
| 1059 | |
| 665 | 1060 static Charbpos |
| 826 | 1061 find_end_of_comment (struct buffer *buf, Charbpos from, Charbpos stop, |
| 1062 int comstyle) | |
| 428 | 1063 { |
| 1064 int c; | |
| 460 | 1065 int prev_code; |
| 1066 /* mask to match comment styles against; for ST_COMMENT_STYLE, this | |
| 1067 will get set to SYNTAX_COMMENT_STYLE_B, but never get checked */ | |
| 1068 int mask = comstyle ? SYNTAX_COMMENT_STYLE_B : SYNTAX_COMMENT_STYLE_A; | |
| 826 | 1069 struct syntax_cache *scache = buf->syntax_cache; |
| 428 | 1070 |
| 460 | 1071 /* This is only called by functions which have already set up the |
| 1072 syntax_cache and are keeping it up-to-date */ | |
| 428 | 1073 while (1) |
| 1074 { | |
| 1075 if (from == stop) | |
| 1076 { | |
| 1077 return -1; | |
| 1078 } | |
| 460 | 1079 |
| 826 | 1080 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 428 | 1081 c = BUF_FETCH_CHAR (buf, from); |
| 460 | 1082 |
| 1083 /* Test for generic comments */ | |
| 1084 if (comstyle == ST_COMMENT_STYLE) | |
| 1085 { | |
| 826 | 1086 if (SYNTAX_FROM_CACHE (scache, c) == Scomment_fence) |
| 460 | 1087 { |
| 1088 from++; | |
| 826 | 1089 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 460 | 1090 break; |
| 1091 } | |
| 1092 from++; | |
| 1093 continue; /* No need to test other comment styles in a | |
| 1094 generic comment */ | |
| 1095 } | |
| 1096 else | |
| 1097 | |
| 826 | 1098 if (SYNTAX_FROM_CACHE (scache, c) == Sendcomment |
| 460 | 1099 && SYNTAX_CODE_MATCHES_1CHAR_P |
| 826 | 1100 (SYNTAX_CODE_FROM_CACHE (scache, c), mask)) |
| 428 | 1101 /* we have encountered a comment end of the same style |
| 1102 as the comment sequence which began this comment | |
| 1103 section */ | |
| 460 | 1104 { |
| 1105 from++; | |
| 826 | 1106 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 460 | 1107 break; |
| 1108 } | |
| 428 | 1109 |
| 826 | 1110 prev_code = SYNTAX_CODE_FROM_CACHE (scache, c); |
| 428 | 1111 from++; |
| 826 | 1112 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 428 | 1113 if (from < stop |
| 460 | 1114 && SYNTAX_CODES_MATCH_END_P |
| 1115 (prev_code, | |
| 826 | 1116 SYNTAX_CODE_FROM_CACHE (scache, BUF_FETCH_CHAR (buf, from)), |
| 460 | 1117 mask) |
| 1118 | |
| 1119 ) | |
| 428 | 1120 /* we have encountered a comment end of the same style |
| 1121 as the comment sequence which began this comment | |
| 1122 section */ | |
| 460 | 1123 { |
| 1124 from++; | |
| 826 | 1125 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 460 | 1126 break; |
| 1127 } | |
| 428 | 1128 } |
| 1129 return from; | |
| 1130 } | |
| 1131 | |
| 1132 | |
| 1133 /* #### between FSF 19.23 and 19.28 there are some changes to the logic | |
| 1134 in this function (and minor changes to find_start_of_comment(), | |
| 1135 above, which is part of Fforward_comment() in FSF). Attempts to port | |
| 1136 that logic made this function break, so I'm leaving it out. If anyone | |
| 1137 ever complains about this function not working properly, take a look | |
| 1138 at those changes. --ben */ | |
| 1139 | |
| 446 | 1140 DEFUN ("forward-comment", Fforward_comment, 0, 2, 0, /* |
| 444 | 1141 Move forward across up to COUNT comments, or backwards if COUNT is negative. |
| 428 | 1142 Stop scanning if we find something other than a comment or whitespace. |
| 1143 Set point to where scanning stops. | |
| 444 | 1144 If COUNT comments are found as expected, with nothing except whitespace |
| 428 | 1145 between them, return t; otherwise return nil. |
| 1146 Point is set in either case. | |
| 446 | 1147 COUNT defaults to 1, and BUFFER defaults to the current buffer. |
| 428 | 1148 */ |
| 444 | 1149 (count, buffer)) |
| 428 | 1150 { |
| 665 | 1151 Charbpos from; |
| 1152 Charbpos stop; | |
| 867 | 1153 Ichar c; |
| 428 | 1154 enum syntaxcode code; |
| 460 | 1155 int syncode; |
| 444 | 1156 EMACS_INT n; |
| 428 | 1157 struct buffer *buf = decode_buffer (buffer, 0); |
| 826 | 1158 struct syntax_cache *scache; |
| 1159 | |
| 446 | 1160 if (NILP (count)) |
| 1161 n = 1; | |
| 1162 else | |
| 1163 { | |
| 1164 CHECK_INT (count); | |
| 1165 n = XINT (count); | |
| 1166 } | |
| 428 | 1167 |
| 1168 from = BUF_PT (buf); | |
| 1169 | |
| 826 | 1170 scache = setup_buffer_syntax_cache (buf, from, n); |
| 444 | 1171 while (n > 0) |
| 428 | 1172 { |
| 1173 QUIT; | |
| 1174 | |
| 1175 stop = BUF_ZV (buf); | |
| 1176 while (from < stop) | |
| 1177 { | |
| 460 | 1178 int comstyle = 0; /* mask for finding matching comment style */ |
| 428 | 1179 |
| 1180 if (char_quoted (buf, from)) | |
| 1181 { | |
| 1182 from++; | |
| 1183 continue; | |
| 1184 } | |
| 1185 | |
| 826 | 1186 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 428 | 1187 c = BUF_FETCH_CHAR (buf, from); |
| 826 | 1188 syncode = SYNTAX_CODE_FROM_CACHE (scache, c); |
| 1189 code = SYNTAX_FROM_CODE (syncode); | |
| 428 | 1190 |
| 1191 if (code == Scomment) | |
| 1192 { | |
| 1193 /* we have encountered a single character comment start | |
| 1194 sequence, and we are ignoring all text inside comments. | |
| 1195 we must record the comment style this character begins | |
| 1196 so that later, only a comment end of the same style actually | |
| 1197 ends the comment section */ | |
| 460 | 1198 comstyle = SYNTAX_CODE_COMMENT_1CHAR_MASK (syncode) |
| 1199 == SYNTAX_COMMENT_STYLE_A ? 0 : 1; | |
| 428 | 1200 } |
| 1201 | |
| 460 | 1202 else if (code == Scomment_fence) |
| 1203 { | |
| 1204 from++; | |
| 1205 code = Scomment; | |
| 1206 comstyle = ST_COMMENT_STYLE; | |
| 1207 } | |
| 1208 | |
| 428 | 1209 else if (from < stop |
| 460 | 1210 && SYNTAX_CODE_START_FIRST_P (syncode)) |
| 428 | 1211 { |
| 460 | 1212 int next_syncode; |
| 826 | 1213 UPDATE_SYNTAX_CACHE_FORWARD (scache, from + 1); |
| 460 | 1214 next_syncode = |
| 826 | 1215 SYNTAX_CODE_FROM_CACHE (scache, BUF_FETCH_CHAR (buf, from + 1)); |
| 460 | 1216 |
| 1217 if (SYNTAX_CODES_START_P (syncode, next_syncode)) | |
| 1218 { | |
| 1219 /* we have encountered a 2char comment start sequence and we | |
| 1220 are ignoring all text inside comments. we must record | |
| 1221 the comment style this sequence begins so that later, | |
| 1222 only a comment end of the same style actually ends | |
| 1223 the comment section */ | |
| 1224 code = Scomment; | |
| 1225 comstyle = | |
| 1226 SYNTAX_CODES_COMMENT_MASK_START (syncode, next_syncode) | |
| 1227 == SYNTAX_COMMENT_STYLE_A ? 0 : 1; | |
| 1228 from++; | |
| 1229 } | |
| 428 | 1230 } |
| 1231 | |
| 1232 if (code == Scomment) | |
| 1233 { | |
| 826 | 1234 Charbpos newfrom = find_end_of_comment (buf, from, stop, |
| 1235 comstyle); | |
| 428 | 1236 if (newfrom < 0) |
| 1237 { | |
| 1238 /* we stopped because from==stop */ | |
| 1239 BUF_SET_PT (buf, stop); | |
| 1240 return Qnil; | |
| 1241 } | |
| 1242 from = newfrom; | |
| 1243 | |
| 1244 /* We have skipped one comment. */ | |
| 1245 break; | |
| 1246 } | |
| 1247 else if (code != Swhitespace | |
| 1248 && code != Sendcomment | |
| 1249 && code != Scomment ) | |
| 1250 { | |
| 1251 BUF_SET_PT (buf, from); | |
| 1252 return Qnil; | |
| 1253 } | |
| 1254 from++; | |
| 1255 } | |
| 1256 | |
| 1257 /* End of comment reached */ | |
| 444 | 1258 n--; |
| 428 | 1259 } |
| 1260 | |
| 444 | 1261 while (n < 0) |
| 428 | 1262 { |
| 1263 QUIT; | |
| 1264 | |
| 1265 stop = BUF_BEGV (buf); | |
| 1266 while (from > stop) | |
| 1267 { | |
| 460 | 1268 int comstyle = 0; /* mask for finding matching comment style */ |
| 428 | 1269 |
| 1270 from--; | |
| 1271 if (char_quoted (buf, from)) | |
| 1272 { | |
| 1273 from--; | |
| 1274 continue; | |
| 1275 } | |
| 1276 | |
| 1277 c = BUF_FETCH_CHAR (buf, from); | |
| 826 | 1278 syncode = SYNTAX_CODE_FROM_CACHE (scache, c); |
| 1279 code = SYNTAX_FROM_CODE (syncode); | |
| 428 | 1280 |
| 1281 if (code == Sendcomment) | |
| 1282 { | |
| 1283 /* we have found a single char end comment. we must record | |
| 1284 the comment style encountered so that later, we can match | |
| 1285 only the proper comment begin sequence of the same style */ | |
| 460 | 1286 comstyle = SYNTAX_CODE_COMMENT_1CHAR_MASK (syncode) |
| 1287 == SYNTAX_COMMENT_STYLE_A ? 0 : 1; | |
| 1288 } | |
| 1289 | |
| 1290 else if (code == Scomment_fence) | |
| 1291 { | |
| 1292 code = Sendcomment; | |
| 1293 comstyle = ST_COMMENT_STYLE; | |
| 428 | 1294 } |
| 1295 | |
| 1296 else if (from > stop | |
| 460 | 1297 && SYNTAX_CODE_END_SECOND_P (syncode)) |
| 428 | 1298 { |
| 460 | 1299 int prev_syncode; |
| 826 | 1300 UPDATE_SYNTAX_CACHE_BACKWARD (scache, from - 1); |
| 460 | 1301 prev_syncode = |
| 826 | 1302 SYNTAX_CODE_FROM_CACHE (scache, BUF_FETCH_CHAR (buf, from - 1)); |
| 460 | 1303 if (SYNTAX_CODES_END_P (prev_syncode, syncode)) |
| 1304 { | |
| 1305 /* We must record the comment style encountered so that | |
| 1306 later, we can match only the proper comment begin | |
| 1307 sequence of the same style. */ | |
| 1308 code = Sendcomment; | |
| 1309 comstyle = SYNTAX_CODES_COMMENT_MASK_END | |
| 1310 (prev_syncode, syncode) == SYNTAX_COMMENT_STYLE_A ? 0 : 1; | |
| 1311 from--; | |
| 1312 } | |
| 428 | 1313 } |
| 1314 | |
| 1315 if (code == Sendcomment) | |
| 1316 { | |
| 460 | 1317 from = find_start_of_comment (buf, from, stop, comstyle); |
| 428 | 1318 break; |
| 1319 } | |
| 1320 | |
| 1321 else if (code != Swhitespace | |
| 460 | 1322 && code != Scomment |
| 1323 && code != Sendcomment) | |
| 428 | 1324 { |
| 1325 BUF_SET_PT (buf, from + 1); | |
| 1326 return Qnil; | |
| 1327 } | |
| 1328 } | |
| 1329 | |
| 444 | 1330 n++; |
| 428 | 1331 } |
| 1332 | |
| 1333 BUF_SET_PT (buf, from); | |
| 1334 return Qt; | |
| 1335 } | |
| 1336 | |
| 1337 | |
| 1338 Lisp_Object | |
| 665 | 1339 scan_lists (struct buffer *buf, Charbpos from, int count, int depth, |
| 444 | 1340 int sexpflag, int noerror) |
| 428 | 1341 { |
| 665 | 1342 Charbpos stop; |
| 867 | 1343 Ichar c; |
| 428 | 1344 int quoted; |
| 1345 int mathexit = 0; | |
| 1346 enum syntaxcode code; | |
| 460 | 1347 int syncode; |
| 428 | 1348 int min_depth = depth; /* Err out if depth gets less than this. */ |
| 826 | 1349 struct syntax_cache *scache; |
| 1350 | |
| 428 | 1351 if (depth > 0) min_depth = 0; |
| 1352 | |
| 826 | 1353 scache = setup_buffer_syntax_cache (buf, from, count); |
| 428 | 1354 while (count > 0) |
| 1355 { | |
| 1356 QUIT; | |
| 1357 | |
| 1358 stop = BUF_ZV (buf); | |
| 1359 while (from < stop) | |
| 1360 { | |
| 460 | 1361 int comstyle = 0; /* mask for finding matching comment style */ |
| 428 | 1362 |
| 826 | 1363 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 428 | 1364 c = BUF_FETCH_CHAR (buf, from); |
| 826 | 1365 syncode = SYNTAX_CODE_FROM_CACHE (scache, c); |
| 1366 code = SYNTAX_FROM_CODE (syncode); | |
| 428 | 1367 from++; |
| 1368 | |
| 1369 /* a 1-char comment start sequence */ | |
| 1370 if (code == Scomment && parse_sexp_ignore_comments) | |
| 1371 { | |
| 460 | 1372 comstyle = SYNTAX_CODE_COMMENT_1CHAR_MASK (syncode) == |
| 1373 SYNTAX_COMMENT_STYLE_A ? 0 : 1; | |
| 428 | 1374 } |
| 1375 | |
| 1376 /* else, a 2-char comment start sequence? */ | |
| 1377 else if (from < stop | |
| 460 | 1378 && SYNTAX_CODE_START_FIRST_P (syncode) |
| 428 | 1379 && parse_sexp_ignore_comments) |
| 1380 { | |
| 460 | 1381 int next_syncode; |
| 826 | 1382 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 460 | 1383 next_syncode = |
| 826 | 1384 SYNTAX_CODE_FROM_CACHE (scache, BUF_FETCH_CHAR (buf, from)); |
| 460 | 1385 |
| 1386 if (SYNTAX_CODES_START_P (syncode, next_syncode)) | |
| 1387 { | |
| 826 | 1388 /* we have encountered a comment start sequence and we |
| 1389 are ignoring all text inside comments. we must record | |
| 1390 the comment style this sequence begins so that later, | |
| 1391 only a comment end of the same style actually ends | |
| 1392 the comment section */ | |
| 1393 code = Scomment; | |
| 460 | 1394 comstyle = SYNTAX_CODES_COMMENT_MASK_START |
| 1395 (syncode, next_syncode) == SYNTAX_COMMENT_STYLE_A ? 0 : 1; | |
| 826 | 1396 from++; |
| 1397 } | |
| 428 | 1398 } |
| 826 | 1399 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 428 | 1400 |
| 460 | 1401 if (SYNTAX_CODE_PREFIX (syncode)) |
| 428 | 1402 continue; |
| 1403 | |
| 1404 switch (code) | |
| 1405 { | |
| 1406 case Sescape: | |
| 1407 case Scharquote: | |
| 1408 if (from == stop) goto lose; | |
| 1409 from++; | |
| 1410 /* treat following character as a word constituent */ | |
| 1411 case Sword: | |
| 1412 case Ssymbol: | |
| 1413 if (depth || !sexpflag) break; | |
| 1414 /* This word counts as a sexp; return at end of it. */ | |
| 1415 while (from < stop) | |
| 1416 { | |
| 826 | 1417 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 1418 switch (SYNTAX_FROM_CACHE (scache, BUF_FETCH_CHAR (buf, from))) | |
| 428 | 1419 { |
| 1420 case Scharquote: | |
| 1421 case Sescape: | |
| 1422 from++; | |
| 1423 if (from == stop) goto lose; | |
| 1424 break; | |
| 1425 case Sword: | |
| 1426 case Ssymbol: | |
| 1427 case Squote: | |
| 1428 break; | |
| 1429 default: | |
| 1430 goto done; | |
| 1431 } | |
| 1432 from++; | |
| 1433 } | |
| 1434 goto done; | |
| 1435 | |
| 460 | 1436 case Scomment_fence: |
| 1437 comstyle = ST_COMMENT_STYLE; | |
| 428 | 1438 case Scomment: |
| 1439 if (!parse_sexp_ignore_comments) | |
| 1440 break; | |
| 826 | 1441 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 428 | 1442 { |
| 665 | 1443 Charbpos newfrom = |
| 460 | 1444 find_end_of_comment (buf, from, stop, comstyle); |
| 428 | 1445 if (newfrom < 0) |
| 1446 { | |
| 1447 /* we stopped because from == stop in search forward */ | |
| 1448 from = stop; | |
| 1449 if (depth == 0) | |
| 1450 goto done; | |
| 1451 goto lose; | |
| 1452 } | |
| 1453 from = newfrom; | |
| 1454 } | |
| 1455 break; | |
| 1456 | |
| 1457 case Smath: | |
| 1458 if (!sexpflag) | |
| 1459 break; | |
| 1460 if (from != stop && c == BUF_FETCH_CHAR (buf, from)) | |
| 1461 from++; | |
| 1462 if (mathexit) | |
| 1463 { | |
| 1464 mathexit = 0; | |
| 1465 goto close1; | |
| 1466 } | |
| 1467 mathexit = 1; | |
| 1468 | |
| 1469 case Sopen: | |
| 1470 if (!++depth) goto done; | |
| 1471 break; | |
| 1472 | |
| 1473 case Sclose: | |
| 1474 close1: | |
| 1475 if (!--depth) goto done; | |
| 1476 if (depth < min_depth) | |
| 1477 { | |
| 444 | 1478 if (noerror) |
| 428 | 1479 return Qnil; |
| 826 | 1480 syntax_error ("Containing expression ends prematurely", |
| 1481 Qunbound); | |
| 428 | 1482 } |
| 1483 break; | |
| 1484 | |
| 460 | 1485 case Sstring_fence: |
| 428 | 1486 case Sstring: |
| 1487 { | |
| 867 | 1488 Ichar stringterm; |
| 460 | 1489 |
| 1490 if (code != Sstring_fence) | |
| 1491 { | |
| 826 | 1492 /* XEmacs change: call syntax_match on character */ |
| 867 | 1493 Ichar ch = BUF_FETCH_CHAR (buf, from - 1); |
| 460 | 1494 Lisp_Object stermobj = |
| 1296 | 1495 syntax_match (scache->syntax_table, ch); |
| 428 | 1496 |
| 1497 if (CHARP (stermobj)) | |
| 1498 stringterm = XCHAR (stermobj); | |
| 1499 else | |
| 1500 stringterm = ch; | |
| 460 | 1501 } |
| 1502 else | |
| 1503 stringterm = '\0'; /* avoid compiler warnings */ | |
| 428 | 1504 |
| 1505 while (1) | |
| 1506 { | |
| 1507 if (from >= stop) | |
| 1508 goto lose; | |
| 826 | 1509 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 460 | 1510 c = BUF_FETCH_CHAR (buf, from); |
| 1511 if (code == Sstring | |
| 1512 ? c == stringterm | |
| 826 | 1513 : SYNTAX_FROM_CACHE (scache, c) == Sstring_fence) |
| 428 | 1514 break; |
| 460 | 1515 |
| 826 | 1516 switch (SYNTAX_FROM_CACHE (scache, c)) |
| 428 | 1517 { |
| 1518 case Scharquote: | |
| 1519 case Sescape: | |
| 1520 from++; | |
| 1521 break; | |
| 1522 default: | |
| 1523 break; | |
| 1524 } | |
| 1525 from++; | |
| 1526 } | |
| 1527 from++; | |
| 1528 if (!depth && sexpflag) goto done; | |
| 1529 break; | |
| 1530 } | |
| 1531 | |
| 1532 default: | |
| 1533 break; | |
| 1534 } | |
| 1535 } | |
| 1536 | |
| 1537 /* Reached end of buffer. Error if within object, | |
| 1538 return nil if between */ | |
| 1539 if (depth) goto lose; | |
| 1540 | |
| 1541 return Qnil; | |
| 1542 | |
| 1543 /* End of object reached */ | |
| 1544 done: | |
| 1545 count--; | |
| 1546 } | |
| 1547 | |
| 1548 while (count < 0) | |
| 1549 { | |
| 1550 QUIT; | |
| 1551 | |
| 1552 stop = BUF_BEGV (buf); | |
| 1553 while (from > stop) | |
| 1554 { | |
| 460 | 1555 int comstyle = 0; /* mask for finding matching comment style */ |
| 428 | 1556 |
| 1557 from--; | |
| 826 | 1558 UPDATE_SYNTAX_CACHE_BACKWARD (scache, from); |
| 428 | 1559 quoted = char_quoted (buf, from); |
| 1560 if (quoted) | |
| 460 | 1561 { |
| 428 | 1562 from--; |
| 826 | 1563 UPDATE_SYNTAX_CACHE_BACKWARD (scache, from); |
| 460 | 1564 } |
| 428 | 1565 |
| 1566 c = BUF_FETCH_CHAR (buf, from); | |
| 826 | 1567 syncode = SYNTAX_CODE_FROM_CACHE (scache, c); |
| 1568 code = SYNTAX_FROM_CODE (syncode); | |
| 428 | 1569 |
| 1570 if (code == Sendcomment && parse_sexp_ignore_comments) | |
| 1571 { | |
| 1572 /* we have found a single char end comment. we must record | |
| 1573 the comment style encountered so that later, we can match | |
| 1574 only the proper comment begin sequence of the same style */ | |
| 460 | 1575 comstyle = SYNTAX_CODE_COMMENT_1CHAR_MASK (syncode) |
| 1576 == SYNTAX_COMMENT_STYLE_A ? 0 : 1; | |
| 428 | 1577 } |
| 1578 | |
| 1579 else if (from > stop | |
| 460 | 1580 && SYNTAX_CODE_END_SECOND_P (syncode) |
| 428 | 1581 && !char_quoted (buf, from - 1) |
| 1582 && parse_sexp_ignore_comments) | |
| 1583 { | |
| 460 | 1584 int prev_syncode; |
| 826 | 1585 UPDATE_SYNTAX_CACHE_BACKWARD (scache, from - 1); |
| 1586 prev_syncode = | |
| 1587 SYNTAX_CODE_FROM_CACHE (scache, BUF_FETCH_CHAR (buf, from - 1)); | |
| 460 | 1588 |
| 1589 if (SYNTAX_CODES_END_P (prev_syncode, syncode)) | |
| 1590 { | |
| 428 | 1591 /* we must record the comment style encountered so that |
| 1592 later, we can match only the proper comment begin | |
| 1593 sequence of the same style */ | |
| 1594 code = Sendcomment; | |
| 460 | 1595 comstyle = SYNTAX_CODES_COMMENT_MASK_END |
| 1596 (prev_syncode, syncode) == SYNTAX_COMMENT_STYLE_A ? 0 : 1; | |
| 428 | 1597 from--; |
| 1598 } | |
| 460 | 1599 } |
| 428 | 1600 |
| 460 | 1601 if (SYNTAX_CODE_PREFIX (syncode)) |
| 428 | 1602 continue; |
| 1603 | |
| 434 | 1604 switch (quoted ? Sword : code) |
| 428 | 1605 { |
| 1606 case Sword: | |
| 1607 case Ssymbol: | |
| 1608 if (depth || !sexpflag) break; | |
| 1609 /* This word counts as a sexp; count object finished after | |
| 1610 passing it. */ | |
| 1611 while (from > stop) | |
| 1612 { | |
| 826 | 1613 UPDATE_SYNTAX_CACHE_BACKWARD (scache, from); |
| 428 | 1614 quoted = char_quoted (buf, from - 1); |
| 1615 | |
| 1616 if (quoted) | |
| 1617 from--; | |
| 1618 if (! (quoted | |
| 1619 || (syncode = | |
| 826 | 1620 SYNTAX_FROM_CACHE (scache, BUF_FETCH_CHAR (buf, |
| 1621 from - 1))) | |
| 428 | 1622 == Sword |
| 1623 || syncode == Ssymbol | |
| 1624 || syncode == Squote)) | |
| 1625 goto done2; | |
| 1626 from--; | |
| 1627 } | |
| 1628 goto done2; | |
| 1629 | |
| 1630 case Smath: | |
| 1631 if (!sexpflag) | |
| 1632 break; | |
| 1633 if (from != stop && c == BUF_FETCH_CHAR (buf, from - 1)) | |
| 1634 from--; | |
| 1635 if (mathexit) | |
| 1636 { | |
| 1637 mathexit = 0; | |
| 1638 goto open2; | |
| 1639 } | |
| 1640 mathexit = 1; | |
| 1641 | |
| 1642 case Sclose: | |
| 1643 if (!++depth) goto done2; | |
| 1644 break; | |
| 1645 | |
| 1646 case Sopen: | |
| 1647 open2: | |
| 1648 if (!--depth) goto done2; | |
| 1649 if (depth < min_depth) | |
| 1650 { | |
| 444 | 1651 if (noerror) |
| 428 | 1652 return Qnil; |
| 826 | 1653 syntax_error ("Containing expression ends prematurely", |
| 1654 Qunbound); | |
| 428 | 1655 } |
| 1656 break; | |
| 1657 | |
| 460 | 1658 case Scomment_fence: |
| 1659 comstyle = ST_COMMENT_STYLE; | |
| 428 | 1660 case Sendcomment: |
| 1661 if (parse_sexp_ignore_comments) | |
| 460 | 1662 from = find_start_of_comment (buf, from, stop, comstyle); |
| 428 | 1663 break; |
| 1664 | |
| 460 | 1665 case Sstring_fence: |
| 428 | 1666 case Sstring: |
| 1667 { | |
| 867 | 1668 Ichar stringterm; |
| 460 | 1669 |
| 1670 if (code != Sstring_fence) | |
| 1671 { | |
| 428 | 1672 /* XEmacs change: call syntax_match() on character */ |
| 867 | 1673 Ichar ch = BUF_FETCH_CHAR (buf, from); |
| 460 | 1674 Lisp_Object stermobj = |
| 1296 | 1675 syntax_match (scache->syntax_table, ch); |
| 428 | 1676 |
| 1677 if (CHARP (stermobj)) | |
| 1678 stringterm = XCHAR (stermobj); | |
| 1679 else | |
| 1680 stringterm = ch; | |
| 460 | 1681 } |
| 1682 else | |
| 1683 stringterm = '\0'; /* avoid compiler warnings */ | |
| 428 | 1684 |
| 1685 while (1) | |
| 1686 { | |
| 1687 if (from == stop) goto lose; | |
| 460 | 1688 |
| 826 | 1689 UPDATE_SYNTAX_CACHE_BACKWARD (scache, from - 1); |
| 460 | 1690 c = BUF_FETCH_CHAR (buf, from - 1); |
| 1691 | |
| 1692 if ((code == Sstring | |
| 1693 ? c == stringterm | |
| 826 | 1694 : SYNTAX_FROM_CACHE (scache, c) == Sstring_fence) |
| 460 | 1695 && !char_quoted (buf, from - 1)) |
| 1696 { | |
| 428 | 1697 break; |
| 460 | 1698 } |
| 1699 | |
| 428 | 1700 from--; |
| 1701 } | |
| 1702 from--; | |
| 1703 if (!depth && sexpflag) goto done2; | |
| 1704 break; | |
| 1705 } | |
| 1706 } | |
| 1707 } | |
| 1708 | |
| 1709 /* Reached start of buffer. Error if within object, | |
| 1710 return nil if between */ | |
| 1711 if (depth) goto lose; | |
| 1712 | |
| 1713 return Qnil; | |
| 1714 | |
| 1715 done2: | |
| 1716 count++; | |
| 1717 } | |
| 1718 | |
| 1719 | |
| 1720 return (make_int (from)); | |
| 1721 | |
| 1722 lose: | |
| 444 | 1723 if (!noerror) |
| 826 | 1724 syntax_error ("Unbalanced parentheses", Qunbound); |
| 428 | 1725 return Qnil; |
| 1726 } | |
| 1727 | |
| 1728 int | |
| 665 | 1729 char_quoted (struct buffer *buf, Charbpos pos) |
| 428 | 1730 { |
| 1731 enum syntaxcode code; | |
| 665 | 1732 Charbpos beg = BUF_BEGV (buf); |
| 428 | 1733 int quoted = 0; |
| 665 | 1734 Charbpos startpos = pos; |
| 826 | 1735 struct syntax_cache *scache = buf->syntax_cache; |
| 460 | 1736 |
| 1737 while (pos > beg) | |
| 1738 { | |
| 826 | 1739 UPDATE_SYNTAX_CACHE_BACKWARD (scache, pos - 1); |
| 1740 code = SYNTAX_FROM_CACHE (scache, BUF_FETCH_CHAR (buf, pos - 1)); | |
| 428 | 1741 |
| 460 | 1742 if (code != Scharquote && code != Sescape) |
| 1743 break; | |
| 1744 pos--; | |
| 1745 quoted = !quoted; | |
| 1746 } | |
| 1747 | |
| 826 | 1748 UPDATE_SYNTAX_CACHE (scache, startpos); |
| 428 | 1749 return quoted; |
| 1750 } | |
| 1751 | |
| 1752 DEFUN ("scan-lists", Fscan_lists, 3, 5, 0, /* | |
| 1753 Scan from character number FROM by COUNT lists. | |
| 1754 Returns the character number of the position thus found. | |
| 1755 | |
| 1756 If DEPTH is nonzero, paren depth begins counting from that value, | |
| 1757 only places where the depth in parentheses becomes zero | |
| 1758 are candidates for stopping; COUNT such places are counted. | |
| 1759 Thus, a positive value for DEPTH means go out levels. | |
| 1760 | |
| 1761 Comments are ignored if `parse-sexp-ignore-comments' is non-nil. | |
| 1762 | |
| 1763 If the beginning or end of (the accessible part of) the buffer is reached | |
| 1764 and the depth is wrong, an error is signaled. | |
| 1765 If the depth is right but the count is not used up, nil is returned. | |
| 1766 | |
| 1767 If optional arg BUFFER is non-nil, scanning occurs in that buffer instead | |
| 1768 of in the current buffer. | |
| 1769 | |
| 1770 If optional arg NOERROR is non-nil, scan-lists will return nil instead of | |
| 1771 signalling an error. | |
| 1772 */ | |
| 444 | 1773 (from, count, depth, buffer, noerror)) |
| 428 | 1774 { |
| 1775 struct buffer *buf; | |
| 1776 | |
| 1777 CHECK_INT (from); | |
| 1778 CHECK_INT (count); | |
| 1779 CHECK_INT (depth); | |
| 1780 buf = decode_buffer (buffer, 0); | |
| 1781 | |
| 1782 return scan_lists (buf, XINT (from), XINT (count), XINT (depth), 0, | |
| 444 | 1783 !NILP (noerror)); |
| 428 | 1784 } |
| 1785 | |
| 1786 DEFUN ("scan-sexps", Fscan_sexps, 2, 4, 0, /* | |
| 1787 Scan from character number FROM by COUNT balanced expressions. | |
| 1788 If COUNT is negative, scan backwards. | |
| 1789 Returns the character number of the position thus found. | |
| 1790 | |
| 1791 Comments are ignored if `parse-sexp-ignore-comments' is non-nil. | |
| 1792 | |
| 1793 If the beginning or end of (the accessible part of) the buffer is reached | |
| 1794 in the middle of a parenthetical grouping, an error is signaled. | |
| 1795 If the beginning or end is reached between groupings | |
| 1796 but before count is used up, nil is returned. | |
| 1797 | |
| 1798 If optional arg BUFFER is non-nil, scanning occurs in that buffer instead | |
| 1799 of in the current buffer. | |
| 1800 | |
| 1801 If optional arg NOERROR is non-nil, scan-sexps will return nil instead of | |
| 1802 signalling an error. | |
| 1803 */ | |
| 444 | 1804 (from, count, buffer, noerror)) |
| 428 | 1805 { |
| 1806 struct buffer *buf = decode_buffer (buffer, 0); | |
| 1807 CHECK_INT (from); | |
| 1808 CHECK_INT (count); | |
| 1809 | |
| 444 | 1810 return scan_lists (buf, XINT (from), XINT (count), 0, 1, !NILP (noerror)); |
| 428 | 1811 } |
| 1812 | |
| 1813 DEFUN ("backward-prefix-chars", Fbackward_prefix_chars, 0, 1, 0, /* | |
| 1814 Move point backward over any number of chars with prefix syntax. | |
| 1815 This includes chars with "quote" or "prefix" syntax (' or p). | |
| 1816 | |
| 1817 Optional arg BUFFER defaults to the current buffer. | |
| 1818 */ | |
| 1819 (buffer)) | |
| 1820 { | |
| 1821 struct buffer *buf = decode_buffer (buffer, 0); | |
| 665 | 1822 Charbpos beg = BUF_BEGV (buf); |
| 1823 Charbpos pos = BUF_PT (buf); | |
| 867 | 1824 Ichar c = '\0'; /* initialize to avoid compiler warnings */ |
| 826 | 1825 struct syntax_cache *scache; |
| 1826 | |
| 1827 scache = setup_buffer_syntax_cache (buf, pos, -1); | |
| 428 | 1828 |
| 1829 while (pos > beg && !char_quoted (buf, pos - 1) | |
| 460 | 1830 /* Previous statement updates syntax table. */ |
| 826 | 1831 && (SYNTAX_FROM_CACHE (scache, c = BUF_FETCH_CHAR (buf, pos - 1)) == Squote |
| 1832 || SYNTAX_CODE_PREFIX (SYNTAX_CODE_FROM_CACHE (scache, c)))) | |
| 428 | 1833 pos--; |
| 1834 | |
| 1835 BUF_SET_PT (buf, pos); | |
| 1836 | |
| 1837 return Qnil; | |
| 1838 } | |
| 1839 | |
| 1840 /* Parse forward from FROM to END, | |
| 1841 assuming that FROM has state OLDSTATE (nil means FROM is start of function), | |
| 1842 and return a description of the state of the parse at END. | |
| 1843 If STOPBEFORE is nonzero, stop at the start of an atom. | |
| 1844 If COMMENTSTOP is nonzero, stop at the start of a comment. */ | |
| 1845 | |
| 1846 static void | |
| 1847 scan_sexps_forward (struct buffer *buf, struct lisp_parse_state *stateptr, | |
| 665 | 1848 Charbpos from, Charbpos end, |
| 428 | 1849 int targetdepth, int stopbefore, |
| 1850 Lisp_Object oldstate, | |
| 1851 int commentstop) | |
| 1852 { | |
| 1853 struct lisp_parse_state state; | |
| 1854 | |
| 1855 enum syntaxcode code; | |
| 1856 struct level { int last, prev; }; | |
| 1857 struct level levelstart[100]; | |
| 1858 struct level *curlevel = levelstart; | |
| 1859 struct level *endlevel = levelstart + 100; | |
| 1860 int depth; /* Paren depth of current scanning location. | |
| 1861 level - levelstart equals this except | |
| 1862 when the depth becomes negative. */ | |
| 1863 int mindepth; /* Lowest DEPTH value seen. */ | |
| 1864 int start_quoted = 0; /* Nonzero means starting after a char quote */ | |
| 460 | 1865 int boundary_stop = commentstop == -1; |
| 428 | 1866 Lisp_Object tem; |
| 826 | 1867 struct syntax_cache *scache; |
| 1868 | |
| 1869 scache = setup_buffer_syntax_cache (buf, from, 1); | |
| 428 | 1870 if (NILP (oldstate)) |
| 1871 { | |
| 1872 depth = 0; | |
| 1873 state.instring = -1; | |
| 1874 state.incomment = 0; | |
| 1875 state.comstyle = 0; /* comment style a by default */ | |
| 460 | 1876 state.comstr_start = -1; /* no comment/string seen. */ |
| 428 | 1877 } |
| 1878 else | |
| 1879 { | |
| 1880 tem = Fcar (oldstate); /* elt 0, depth */ | |
| 1881 if (!NILP (tem)) | |
| 1882 depth = XINT (tem); | |
| 1883 else | |
| 1884 depth = 0; | |
| 1885 | |
| 1886 oldstate = Fcdr (oldstate); | |
| 1887 oldstate = Fcdr (oldstate); | |
| 1888 oldstate = Fcdr (oldstate); | |
| 1889 tem = Fcar (oldstate); /* elt 3, instring */ | |
| 460 | 1890 state.instring = ( !NILP (tem) |
| 1891 ? ( INTP (tem) ? XINT (tem) : ST_STRING_STYLE) | |
| 1892 : -1); | |
| 428 | 1893 |
| 460 | 1894 oldstate = Fcdr (oldstate); |
| 1895 tem = Fcar (oldstate); /* elt 4, incomment */ | |
| 428 | 1896 state.incomment = !NILP (tem); |
| 1897 | |
| 1898 oldstate = Fcdr (oldstate); | |
| 1899 tem = Fcar (oldstate); /* elt 5, follows-quote */ | |
| 1900 start_quoted = !NILP (tem); | |
| 1901 | |
| 1902 /* if the eighth element of the list is nil, we are in comment style | |
| 3025 | 1903 a; if it is t, we are in comment style b; if it is `syntax-table', |
| 460 | 1904 we are in a generic comment */ |
| 428 | 1905 oldstate = Fcdr (oldstate); |
| 1906 oldstate = Fcdr (oldstate); | |
| 460 | 1907 tem = Fcar (oldstate); /* elt 7, comment style a/b/fence */ |
| 1908 state.comstyle = NILP (tem) ? 0 : ( EQ (tem, Qsyntax_table) | |
| 1909 ? ST_COMMENT_STYLE : 1 ); | |
| 1910 | |
| 1911 oldstate = Fcdr (oldstate); /* elt 8, start of last comment/string */ | |
| 1912 tem = Fcar (oldstate); | |
| 1913 state.comstr_start = NILP (tem) ? -1 : XINT (tem); | |
| 1914 | |
| 1915 /* elt 9, char numbers of starts-of-expression of levels | |
| 1916 (starting from outermost). */ | |
| 1917 oldstate = Fcdr (oldstate); | |
| 1918 tem = Fcar (oldstate); /* elt 9, intermediate data for | |
| 1919 continuation of parsing (subject | |
| 1920 to change). */ | |
| 1921 while (!NILP (tem)) /* >= second enclosing sexps. */ | |
| 1922 { | |
| 1923 curlevel->last = XINT (Fcar (tem)); | |
| 1924 if (++curlevel == endlevel) | |
| 826 | 1925 stack_overflow ("Nesting too deep for parser", |
| 1926 make_int (curlevel - levelstart)); | |
| 460 | 1927 curlevel->prev = -1; |
| 1928 curlevel->last = -1; | |
| 1929 tem = Fcdr (tem); | |
| 1930 } | |
| 428 | 1931 } |
| 1932 state.quoted = 0; | |
| 1933 mindepth = depth; | |
| 1934 | |
| 1935 curlevel->prev = -1; | |
| 1936 curlevel->last = -1; | |
| 1937 | |
| 1938 /* Enter the loop at a place appropriate for initial state. */ | |
| 1939 | |
| 1940 if (state.incomment) goto startincomment; | |
| 1941 if (state.instring >= 0) | |
| 1942 { | |
| 1943 if (start_quoted) goto startquotedinstring; | |
| 1944 goto startinstring; | |
| 1945 } | |
| 1946 if (start_quoted) goto startquoted; | |
| 1947 | |
| 1948 while (from < end) | |
| 1949 { | |
| 867 | 1950 Ichar c; |
| 460 | 1951 int syncode; |
| 1952 | |
| 428 | 1953 QUIT; |
| 1954 | |
| 826 | 1955 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 460 | 1956 c = BUF_FETCH_CHAR (buf, from); |
| 826 | 1957 syncode = SYNTAX_CODE_FROM_CACHE (scache, c); |
| 1958 code = SYNTAX_FROM_CODE (syncode); | |
| 428 | 1959 from++; |
| 1960 | |
| 1961 /* record the comment style we have entered so that only the | |
| 1962 comment-ender sequence (or single char) of the same style | |
| 1963 actually terminates the comment section. */ | |
| 460 | 1964 if (code == Scomment) |
| 1965 { | |
| 1966 state.comstyle = | |
| 1967 SYNTAX_CODE_COMMENT_1CHAR_MASK (syncode) | |
| 1968 == SYNTAX_COMMENT_STYLE_A ? 0 : 1; | |
| 1969 state.comstr_start = from - 1; | |
| 1970 } | |
| 1971 | |
| 1972 /* a generic comment delimiter? */ | |
| 1973 else if (code == Scomment_fence) | |
| 1974 { | |
| 1975 state.comstyle = ST_COMMENT_STYLE; | |
| 1976 state.comstr_start = from - 1; | |
| 1977 code = Scomment; | |
| 428 | 1978 } |
| 1979 | |
| 1980 else if (from < end && | |
| 460 | 1981 SYNTAX_CODE_START_FIRST_P (syncode)) |
| 428 | 1982 { |
| 460 | 1983 int next_syncode; |
| 826 | 1984 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 460 | 1985 next_syncode = |
| 826 | 1986 SYNTAX_CODE_FROM_CACHE (scache, BUF_FETCH_CHAR (buf, from)); |
| 460 | 1987 |
| 1988 if (SYNTAX_CODES_START_P (syncode, next_syncode)) | |
| 1989 { | |
| 428 | 1990 code = Scomment; |
| 460 | 1991 state.comstyle = SYNTAX_CODES_COMMENT_MASK_START |
| 1992 (syncode, next_syncode) == SYNTAX_COMMENT_STYLE_A ? 0 : 1; | |
| 1993 state.comstr_start = from - 1; | |
| 428 | 1994 from++; |
| 826 | 1995 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 460 | 1996 } |
| 428 | 1997 } |
| 1998 | |
| 460 | 1999 if (SYNTAX_CODE_PREFIX (syncode)) |
| 428 | 2000 continue; |
| 2001 switch (code) | |
| 2002 { | |
| 2003 case Sescape: | |
| 2004 case Scharquote: | |
| 2005 if (stopbefore) goto stop; /* this arg means stop at sexp start */ | |
| 2006 curlevel->last = from - 1; | |
| 2007 startquoted: | |
| 2008 if (from == end) goto endquoted; | |
| 2009 from++; | |
| 2010 goto symstarted; | |
| 2011 /* treat following character as a word constituent */ | |
| 2012 case Sword: | |
| 2013 case Ssymbol: | |
| 2014 if (stopbefore) goto stop; /* this arg means stop at sexp start */ | |
| 2015 curlevel->last = from - 1; | |
| 2016 symstarted: | |
| 2017 while (from < end) | |
| 2018 { | |
| 826 | 2019 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 2020 switch (SYNTAX_FROM_CACHE (scache, BUF_FETCH_CHAR (buf, from))) | |
| 428 | 2021 { |
| 2022 case Scharquote: | |
| 2023 case Sescape: | |
| 2024 from++; | |
| 2025 if (from == end) goto endquoted; | |
| 2026 break; | |
| 2027 case Sword: | |
| 2028 case Ssymbol: | |
| 2029 case Squote: | |
| 2030 break; | |
| 2031 default: | |
| 2032 goto symdone; | |
| 2033 } | |
| 2034 from++; | |
| 2035 } | |
| 2036 symdone: | |
| 2037 curlevel->prev = curlevel->last; | |
| 2038 break; | |
| 2039 | |
| 2040 case Scomment: | |
| 2041 state.incomment = 1; | |
| 460 | 2042 if (commentstop || boundary_stop) goto done; |
| 428 | 2043 startincomment: |
| 460 | 2044 if (commentstop == 1) |
| 428 | 2045 goto done; |
| 826 | 2046 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 428 | 2047 { |
| 826 | 2048 Charbpos newfrom = find_end_of_comment (buf, from, end, |
| 2049 state.comstyle); | |
| 428 | 2050 if (newfrom < 0) |
| 2051 { | |
| 2052 /* we terminated search because from == end */ | |
| 2053 from = end; | |
| 2054 goto done; | |
| 2055 } | |
| 2056 from = newfrom; | |
| 2057 } | |
| 2058 state.incomment = 0; | |
| 2059 state.comstyle = 0; /* reset the comment style */ | |
| 460 | 2060 if (boundary_stop) goto done; |
| 428 | 2061 break; |
| 2062 | |
| 2063 case Sopen: | |
| 2064 if (stopbefore) goto stop; /* this arg means stop at sexp start */ | |
| 2065 depth++; | |
| 2066 /* curlevel++->last ran into compiler bug on Apollo */ | |
| 2067 curlevel->last = from - 1; | |
| 2068 if (++curlevel == endlevel) | |
| 826 | 2069 stack_overflow ("Nesting too deep for parser", |
| 2070 make_int (curlevel - levelstart)); | |
| 428 | 2071 curlevel->prev = -1; |
| 2072 curlevel->last = -1; | |
| 2073 if (targetdepth == depth) goto done; | |
| 2074 break; | |
| 2075 | |
| 2076 case Sclose: | |
| 2077 depth--; | |
| 2078 if (depth < mindepth) | |
| 2079 mindepth = depth; | |
| 2080 if (curlevel != levelstart) | |
| 2081 curlevel--; | |
| 2082 curlevel->prev = curlevel->last; | |
| 2083 if (targetdepth == depth) goto done; | |
| 2084 break; | |
| 2085 | |
| 2086 case Sstring: | |
| 460 | 2087 case Sstring_fence: |
| 2088 state.comstr_start = from - 1; | |
| 428 | 2089 if (stopbefore) goto stop; /* this arg means stop at sexp start */ |
| 2090 curlevel->last = from - 1; | |
| 460 | 2091 if (code == Sstring_fence) |
| 428 | 2092 { |
| 460 | 2093 state.instring = ST_STRING_STYLE; |
| 2094 } | |
| 2095 else | |
| 2096 { | |
| 2097 /* XEmacs change: call syntax_match() on character */ | |
| 867 | 2098 Ichar ch = BUF_FETCH_CHAR (buf, from - 1); |
| 460 | 2099 Lisp_Object stermobj = |
| 1296 | 2100 syntax_match (scache->syntax_table, ch); |
| 428 | 2101 |
| 2102 if (CHARP (stermobj)) | |
| 2103 state.instring = XCHAR (stermobj); | |
| 2104 else | |
| 2105 state.instring = ch; | |
| 2106 } | |
| 460 | 2107 if (boundary_stop) goto done; |
| 428 | 2108 startinstring: |
| 2109 while (1) | |
| 2110 { | |
| 460 | 2111 enum syntaxcode temp_code; |
| 2112 | |
| 428 | 2113 if (from >= end) goto done; |
| 460 | 2114 |
| 826 | 2115 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 460 | 2116 c = BUF_FETCH_CHAR (buf, from); |
| 826 | 2117 temp_code = SYNTAX_FROM_CACHE (scache, c); |
| 460 | 2118 |
| 2119 if ( | |
| 2120 state.instring != ST_STRING_STYLE && | |
| 2121 temp_code == Sstring && | |
| 2122 c == state.instring) break; | |
| 2123 | |
| 2124 switch (temp_code) | |
| 428 | 2125 { |
| 460 | 2126 case Sstring_fence: |
| 2127 if (state.instring == ST_STRING_STYLE) | |
| 2128 goto string_end; | |
| 2129 break; | |
| 428 | 2130 case Scharquote: |
| 2131 case Sescape: | |
| 2132 { | |
| 2133 from++; | |
| 2134 startquotedinstring: | |
| 2135 if (from >= end) goto endquoted; | |
| 2136 break; | |
| 2137 } | |
| 2138 default: | |
| 2139 break; | |
| 2140 } | |
| 2141 from++; | |
| 2142 } | |
| 460 | 2143 string_end: |
| 428 | 2144 state.instring = -1; |
| 2145 curlevel->prev = curlevel->last; | |
| 2146 from++; | |
| 460 | 2147 if (boundary_stop) goto done; |
| 428 | 2148 break; |
| 2149 | |
| 2150 case Smath: | |
| 2151 break; | |
| 2152 | |
| 2153 case Swhitespace: | |
| 2154 case Spunct: | |
| 2155 case Squote: | |
| 2156 case Sendcomment: | |
| 460 | 2157 case Scomment_fence: |
| 428 | 2158 case Sinherit: |
| 2159 case Smax: | |
| 2160 break; | |
| 2161 } | |
| 2162 } | |
| 2163 goto done; | |
| 2164 | |
| 2165 stop: /* Here if stopping before start of sexp. */ | |
| 2166 from--; /* We have just fetched the char that starts it; */ | |
| 2167 goto done; /* but return the position before it. */ | |
| 2168 | |
| 2169 endquoted: | |
| 2170 state.quoted = 1; | |
| 2171 done: | |
| 2172 state.depth = depth; | |
| 2173 state.mindepth = mindepth; | |
| 2174 state.thislevelstart = curlevel->prev; | |
| 2175 state.prevlevelstart | |
| 2176 = (curlevel == levelstart) ? -1 : (curlevel - 1)->last; | |
| 2177 state.location = from; | |
| 460 | 2178 state.levelstarts = Qnil; |
| 2179 while (--curlevel >= levelstart) | |
| 2180 state.levelstarts = Fcons (make_int (curlevel->last), | |
| 2181 state.levelstarts); | |
| 428 | 2182 |
| 2183 *stateptr = state; | |
| 2184 } | |
| 2185 | |
| 2186 DEFUN ("parse-partial-sexp", Fparse_partial_sexp, 2, 7, 0, /* | |
| 2187 Parse Lisp syntax starting at FROM until TO; return status of parse at TO. | |
| 2188 Parsing stops at TO or when certain criteria are met; | |
| 2189 point is set to where parsing stops. | |
| 444 | 2190 If fifth arg OLDSTATE is omitted or nil, |
| 428 | 2191 parsing assumes that FROM is the beginning of a function. |
| 460 | 2192 Value is a list of nine elements describing final state of parsing: |
| 428 | 2193 0. depth in parens. |
| 2194 1. character address of start of innermost containing list; nil if none. | |
| 2195 2. character address of start of last complete sexp terminated. | |
| 2196 3. non-nil if inside a string. | |
| 460 | 2197 (It is the character that will terminate the string, |
| 2198 or t if the string should be terminated by an explicit | |
| 2199 `syntax-table' property.) | |
| 428 | 2200 4. t if inside a comment. |
| 2201 5. t if following a quote character. | |
| 2202 6. the minimum paren-depth encountered during this scan. | |
| 460 | 2203 7. nil if in comment style a, or not in a comment; t if in comment style b; |
| 2204 `syntax-table' if given by an explicit `syntax-table' property. | |
| 2205 8. character address of start of last comment or string; nil if none. | |
| 2206 9. Intermediate data for continuation of parsing (subject to change). | |
| 428 | 2207 If third arg TARGETDEPTH is non-nil, parsing stops if the depth |
| 2208 in parentheses becomes equal to TARGETDEPTH. | |
| 2209 Fourth arg STOPBEFORE non-nil means stop when come to | |
| 2210 any character that starts a sexp. | |
| 460 | 2211 Fifth arg OLDSTATE is a nine-element list like what this function returns. |
| 428 | 2212 It is used to initialize the state of the parse. Its second and third |
| 2213 elements are ignored. | |
| 460 | 2214 Sixth arg COMMENTSTOP non-nil means stop at the start of a comment. If it |
| 2215 is `syntax-table', stop after the start of a comment or a string, or after | |
| 2216 the end of a comment or string. | |
| 826 | 2217 Seventh arg BUFFER specifies the buffer to do the parsing in, and defaults |
| 2218 to the current buffer. | |
| 428 | 2219 */ |
| 2220 (from, to, targetdepth, stopbefore, oldstate, commentstop, buffer)) | |
| 2221 { | |
| 2222 struct lisp_parse_state state; | |
| 2223 int target; | |
| 665 | 2224 Charbpos start, end; |
| 428 | 2225 struct buffer *buf = decode_buffer (buffer, 0); |
| 2226 Lisp_Object val; | |
| 2227 | |
| 2228 if (!NILP (targetdepth)) | |
| 2229 { | |
| 2230 CHECK_INT (targetdepth); | |
| 2231 target = XINT (targetdepth); | |
| 2232 } | |
| 2233 else | |
| 2234 target = -100000; /* We won't reach this depth */ | |
| 2235 | |
| 2236 get_buffer_range_char (buf, from, to, &start, &end, 0); | |
| 2237 scan_sexps_forward (buf, &state, start, end, | |
| 2238 target, !NILP (stopbefore), oldstate, | |
| 460 | 2239 (NILP (commentstop) |
| 2240 ? 0 : (EQ (commentstop, Qsyntax_table) ? -1 : 1))); | |
| 428 | 2241 BUF_SET_PT (buf, state.location); |
| 2242 | |
| 2243 /* reverse order */ | |
| 2244 val = Qnil; | |
| 460 | 2245 val = Fcons (state.levelstarts, val); |
| 2246 val = Fcons ((state.incomment || (state.instring >= 0)) | |
| 2247 ? make_int (state.comstr_start) : Qnil, val); | |
| 2248 val = Fcons (state.comstyle ? (state.comstyle == ST_COMMENT_STYLE | |
| 2249 ? Qsyntax_table : Qt) : Qnil, val); | |
| 428 | 2250 val = Fcons (make_int (state.mindepth), val); |
| 2251 val = Fcons (state.quoted ? Qt : Qnil, val); | |
| 2252 val = Fcons (state.incomment ? Qt : Qnil, val); | |
| 460 | 2253 val = Fcons (state.instring < 0 |
| 2254 ? Qnil | |
| 2255 : (state.instring == ST_STRING_STYLE | |
| 2256 ? Qt : make_int (state.instring)), val); | |
| 826 | 2257 val = Fcons (state.thislevelstart < 0 ? Qnil : |
| 2258 make_int (state.thislevelstart), val); | |
| 2259 val = Fcons (state.prevlevelstart < 0 ? Qnil : | |
| 2260 make_int (state.prevlevelstart), val); | |
| 428 | 2261 val = Fcons (make_int (state.depth), val); |
| 2262 | |
| 2263 return val; | |
| 2264 } | |
| 2265 | |
| 2266 | |
| 2267 /* Updating of the mirror syntax table. | |
| 2268 | |
| 1296 | 2269 Each syntax table has a corresponding mirror table in it. Whenever we |
| 2270 make a change to a syntax table, we set a dirty flag. When accessing a | |
| 2271 value from the mirror table and the table is dirty, we call | |
| 2272 update_syntax_table() to clean it up. | |
| 428 | 2273 |
| 2274 #### We really only need to map over the changed range. | |
| 2275 | |
| 2276 If we change the standard syntax table, we need to map over | |
| 2277 all tables because any of them could be inheriting from the | |
| 2278 standard syntax table. | |
| 2279 | |
| 2280 When `set-syntax-table' is called, we set the buffer's mirror | |
| 2281 syntax table as well. | |
| 2282 */ | |
| 2283 | |
| 826 | 2284 static int |
| 2286 | 2285 copy_to_mirrortab (struct chartab_range *range, Lisp_Object UNUSED (table), |
| 826 | 2286 Lisp_Object val, void *arg) |
| 428 | 2287 { |
| 826 | 2288 Lisp_Object mirrortab = VOID_TO_LISP (arg); |
| 428 | 2289 |
| 2290 if (CONSP (val)) | |
| 2291 val = XCAR (val); | |
| 826 | 2292 if (SYNTAX_FROM_CODE (XINT (val)) != Sinherit) |
| 2293 put_char_table (mirrortab, range, val); | |
| 2294 return 0; | |
| 2295 } | |
| 2296 | |
| 2297 static int | |
| 2286 | 2298 copy_if_not_already_present (struct chartab_range *range, |
| 2299 Lisp_Object UNUSED (table), | |
| 826 | 2300 Lisp_Object val, void *arg) |
| 2301 { | |
| 1296 | 2302 Lisp_Object mirrortab = VOID_TO_LISP (arg); |
| 826 | 2303 if (CONSP (val)) |
| 2304 val = XCAR (val); | |
| 2305 if (SYNTAX_FROM_CODE (XINT (val)) != Sinherit) | |
| 2306 { | |
| 2307 Lisp_Object existing = | |
| 1296 | 2308 updating_mirror_get_range_char_table (range, mirrortab, |
| 2309 Vbogus_syntax_table_value); | |
| 826 | 2310 if (NILP (existing)) |
| 2311 /* nothing at all */ | |
| 1296 | 2312 put_char_table (mirrortab, range, val); |
| 2313 else if (!EQ (existing, Vbogus_syntax_table_value)) | |
| 826 | 2314 /* full */ |
| 2315 ; | |
| 2316 else | |
| 2317 { | |
| 2318 Freset_char_table (Vtemp_table_for_use_updating_syntax_tables); | |
| 2319 copy_char_table_range | |
| 1296 | 2320 (mirrortab, Vtemp_table_for_use_updating_syntax_tables, range); |
| 2321 put_char_table (mirrortab, range, val); | |
| 826 | 2322 copy_char_table_range |
| 1296 | 2323 (Vtemp_table_for_use_updating_syntax_tables, mirrortab, range); |
| 826 | 2324 } |
| 428 | 2325 } |
| 826 | 2326 |
| 428 | 2327 return 0; |
| 2328 } | |
| 2329 | |
| 2330 static void | |
| 826 | 2331 update_just_this_syntax_table (Lisp_Object table) |
| 428 | 2332 { |
| 2333 struct chartab_range range; | |
| 826 | 2334 Lisp_Object mirrortab = XCHAR_TABLE (table)->mirror_table; |
| 2335 | |
| 1296 | 2336 assert (!XCHAR_TABLE (table)->mirror_table_p); |
| 826 | 2337 range.type = CHARTAB_RANGE_ALL; |
| 2338 Freset_char_table (mirrortab); | |
| 1296 | 2339 |
| 826 | 2340 /* First, copy the tables values other than inherit into the mirror |
| 2341 table. Then, for tables other than the standard syntax table, map | |
| 2342 over the standard table, copying values into the mirror table only if | |
| 2343 entries don't already exist in that table. (The copying step requires | |
| 2344 another mapping.) | |
| 2345 */ | |
| 428 | 2346 |
| 826 | 2347 map_char_table (table, &range, copy_to_mirrortab, LISP_TO_VOID (mirrortab)); |
| 2348 /* second clause catches bootstrapping problems when initializing the | |
| 2349 standard syntax table */ | |
| 2350 if (!EQ (table, Vstandard_syntax_table) && !NILP (Vstandard_syntax_table)) | |
| 1296 | 2351 map_char_table (Vstandard_syntax_table, &range, |
| 2352 copy_if_not_already_present, LISP_TO_VOID (mirrortab)); | |
| 3152 | 2353 /* The resetting made the default be Qnil. Put it back to Sword. */ |
| 2354 set_char_table_default (mirrortab, make_int (Sword)); | |
| 1296 | 2355 XCHAR_TABLE (mirrortab)->dirty = 0; |
| 428 | 2356 } |
| 2357 | |
| 2358 /* Called from chartab.c when a change is made to a syntax table. | |
| 2359 If this is the standard syntax table, we need to recompute | |
| 2360 *all* syntax tables (yuck). Otherwise we just recompute this | |
| 2361 one. */ | |
| 2362 | |
| 2363 void | |
| 826 | 2364 update_syntax_table (Lisp_Object table) |
| 428 | 2365 { |
| 1296 | 2366 Lisp_Object nonmirror = XCHAR_TABLE (table)->mirror_table; |
| 2367 assert (XCHAR_TABLE (table)->mirror_table_p); | |
| 2368 if (EQ (nonmirror, Vstandard_syntax_table)) | |
| 428 | 2369 { |
| 2370 Lisp_Object syntab; | |
| 2371 | |
| 2372 for (syntab = Vall_syntax_tables; !NILP (syntab); | |
| 2373 syntab = XCHAR_TABLE (syntab)->next_table) | |
| 826 | 2374 update_just_this_syntax_table (syntab); |
| 428 | 2375 } |
| 2376 else | |
| 1296 | 2377 update_just_this_syntax_table (nonmirror); |
| 428 | 2378 } |
| 2379 | |
| 2380 | |
| 2381 /************************************************************************/ | |
| 2382 /* initialization */ | |
| 2383 /************************************************************************/ | |
| 2384 | |
| 2385 void | |
| 2386 syms_of_syntax (void) | |
| 2387 { | |
| 3092 | 2388 #ifdef NEW_GC |
| 2389 INIT_LRECORD_IMPLEMENTATION (syntax_cache); | |
| 2390 #endif /* NEW_GC */ | |
| 563 | 2391 DEFSYMBOL (Qsyntax_table_p); |
| 2392 DEFSYMBOL (Qsyntax_table); | |
| 428 | 2393 |
| 2394 DEFSUBR (Fsyntax_table_p); | |
| 2395 DEFSUBR (Fsyntax_table); | |
| 826 | 2396 #ifdef DEBUG_XEMACS |
| 2397 DEFSUBR (Fmirror_syntax_table); | |
| 2398 DEFSUBR (Fsyntax_cache_info); | |
| 2399 #endif /* DEBUG_XEMACS */ | |
| 428 | 2400 DEFSUBR (Fstandard_syntax_table); |
| 2401 DEFSUBR (Fcopy_syntax_table); | |
| 2402 DEFSUBR (Fset_syntax_table); | |
| 2403 DEFSUBR (Fsyntax_designator_chars); | |
| 2404 DEFSUBR (Fchar_syntax); | |
| 2405 DEFSUBR (Fmatching_paren); | |
| 2406 /* DEFSUBR (Fmodify_syntax_entry); now in Lisp. */ | |
| 2407 /* DEFSUBR (Fdescribe_syntax); now in Lisp. */ | |
| 2408 | |
| 2409 DEFSUBR (Fforward_word); | |
| 2410 | |
| 2411 DEFSUBR (Fforward_comment); | |
| 2412 DEFSUBR (Fscan_lists); | |
| 2413 DEFSUBR (Fscan_sexps); | |
| 2414 DEFSUBR (Fbackward_prefix_chars); | |
| 2415 DEFSUBR (Fparse_partial_sexp); | |
| 2416 } | |
| 2417 | |
| 2418 void | |
| 2419 vars_of_syntax (void) | |
| 2420 { | |
| 2421 DEFVAR_BOOL ("parse-sexp-ignore-comments", &parse_sexp_ignore_comments /* | |
| 2422 Non-nil means `forward-sexp', etc., should treat comments as whitespace. | |
| 2423 */ ); | |
| 434 | 2424 parse_sexp_ignore_comments = 0; |
| 428 | 2425 |
| 460 | 2426 DEFVAR_BOOL ("lookup-syntax-properties", &lookup_syntax_properties /* |
| 826 | 2427 Non-nil means `forward-sexp', etc., respect the `syntax-table' property. |
| 2428 This property can be placed on buffers or strings and can be used to explicitly | |
| 2429 specify the syntax table to be used for looking up the syntax of the chars | |
| 2430 having this property, or to directly specify the syntax of the chars. | |
| 2431 | |
| 460 | 2432 The value of this property should be either a syntax table, or a cons |
| 2433 of the form (SYNTAXCODE . MATCHCHAR), SYNTAXCODE being the numeric | |
| 2434 syntax code, MATCHCHAR being nil or the character to match (which is | |
| 826 | 2435 relevant only when the syntax code is open/close-type). |
| 460 | 2436 */ ); |
| 2437 lookup_syntax_properties = 1; | |
| 2438 | |
| 428 | 2439 DEFVAR_BOOL ("words-include-escapes", &words_include_escapes /* |
| 2440 Non-nil means `forward-word', etc., should treat escape chars part of words. | |
| 2441 */ ); | |
| 434 | 2442 words_include_escapes = 0; |
| 428 | 2443 |
| 2444 no_quit_in_re_search = 0; | |
| 1296 | 2445 |
| 2446 Vbogus_syntax_table_value = make_float (0.0); | |
| 2447 staticpro (&Vbogus_syntax_table_value); | |
| 428 | 2448 } |
| 2449 | |
| 2450 static void | |
| 3540 | 2451 define_standard_syntax (const UExtbyte *p, enum syntaxcode syn) |
| 428 | 2452 { |
| 2453 for (; *p; p++) | |
| 2454 Fput_char_table (make_char (*p), make_int (syn), Vstandard_syntax_table); | |
| 2455 } | |
| 2456 | |
| 2457 void | |
| 2458 complex_vars_of_syntax (void) | |
| 2459 { | |
| 867 | 2460 Ichar i; |
| 3540 | 2461 const UExtbyte *p; /* Latin-1, not internal format. */ |
| 2462 | |
| 2463 #define SET_RANGE_SYNTAX(start, end, syntax) \ | |
| 2464 do { \ | |
| 2465 for (i = start; i <= end; i++) \ | |
| 2466 Fput_char_table(make_char(i), make_int(syntax), \ | |
| 2467 Vstandard_syntax_table); \ | |
| 2468 } while (0) | |
| 2469 | |
| 2470 /* Set this now, so first buffer creation can refer to it. | |
| 2471 | |
| 2472 Make it nil before calling copy-syntax-table so that copy-syntax-table | |
| 2473 will know not to try to copy from garbage */ | |
| 428 | 2474 Vstandard_syntax_table = Qnil; |
| 2475 Vstandard_syntax_table = Fcopy_syntax_table (Qnil); | |
| 2476 staticpro (&Vstandard_syntax_table); | |
| 2477 | |
| 826 | 2478 Vtemp_table_for_use_updating_syntax_tables = Fmake_char_table (Qgeneric); |
| 2479 staticpro (&Vtemp_table_for_use_updating_syntax_tables); | |
| 2480 | |
| 428 | 2481 Vsyntax_designator_chars_string = make_string_nocopy (syntax_code_spec, |
| 2482 Smax); | |
| 2483 staticpro (&Vsyntax_designator_chars_string); | |
| 2484 | |
| 3540 | 2485 /* Default character syntax is word. */ |
| 3152 | 2486 set_char_table_default (Vstandard_syntax_table, make_int (Sword)); |
| 428 | 2487 |
| 3540 | 2488 /* Control 0; treat as punctuation */ |
| 2489 SET_RANGE_SYNTAX(0, 32, Spunct); | |
| 428 | 2490 |
| 3544 | 2491 /* The whitespace--overwriting some of the above changes. |
| 2492 | |
| 2493 String literals are const char *s, not const unsigned char *s. */ | |
|
4653
25e5e5346d31
?\012 is whitespace, as it always should have been, thank you Karl Kleinpaste.
Aidan Kehoe <kehoea@parhasard.net>
parents:
4141
diff
changeset
|
2494 define_standard_syntax((const UExtbyte *)" \t\015\014\012", Swhitespace); |
| 3540 | 2495 |
| 2496 /* DEL plus Control 1 */ | |
| 2497 SET_RANGE_SYNTAX(127, 159, Spunct); | |
| 2498 | |
| 3544 | 2499 define_standard_syntax ((const UExtbyte *)"\"", Sstring); |
| 2500 define_standard_syntax ((const UExtbyte *)"\\", Sescape); | |
| 2501 define_standard_syntax ((const UExtbyte *)"_-+*/&|<>=", Ssymbol); | |
| 2502 define_standard_syntax ((const UExtbyte *)".,;:?!#@~^'`", Spunct); | |
| 428 | 2503 |
| 3544 | 2504 for (p = (const UExtbyte *)"()[]{}"; *p; p+=2) |
| 428 | 2505 { |
| 2506 Fput_char_table (make_char (p[0]), | |
| 2507 Fcons (make_int (Sopen), make_char (p[1])), | |
| 2508 Vstandard_syntax_table); | |
| 2509 Fput_char_table (make_char (p[1]), | |
| 2510 Fcons (make_int (Sclose), make_char (p[0])), | |
| 2511 Vstandard_syntax_table); | |
| 2512 } | |
| 3540 | 2513 |
| 2514 /* Latin 1 "symbols." This contrasts with the FSF, where they're word | |
| 2515 constituents. */ | |
| 2516 SET_RANGE_SYNTAX(0240, 0277, Ssymbol); | |
| 2517 | |
| 2518 /* The guillemets. These are not parentheses, in contrast to what the old | |
| 2519 code did. */ | |
| 3569 | 2520 define_standard_syntax((const UExtbyte *)"\253\273", Spunct); |
| 3540 | 2521 |
| 2522 /* The inverted exclamation mark, and the multiplication and division | |
| 2523 signs. */ | |
| 3544 | 2524 define_standard_syntax((const UExtbyte *)"\241\327\367", Spunct); |
| 3540 | 2525 |
| 2526 #undef SET_RANGE_SYNTAX | |
| 428 | 2527 } |