Mercurial > hg > xemacs-beta
annotate src/syntax.c @ 5544:c2301b2c88c8
Improve documentation of syntax table internals.
| author | Stephen J. Turnbull <stephen@xemacs.org> |
|---|---|
| date | Mon, 08 Aug 2011 13:57:20 +0900 |
| parents | fbe90e6f7a43 |
| children | 69de75c48efa |
| 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. | |
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4 Copyright (C) 2001, 2002, 2003, 2010 Ben Wing. |
| 428 | 5 |
| 6 This file is part of XEmacs. | |
| 7 | |
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8 XEmacs is free software: you can redistribute it and/or modify it |
| 428 | 9 under the terms of the GNU General Public License as published by the |
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10 Free Software Foundation, either version 3 of the License, or (at your |
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11 option) any later version. |
| 428 | 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 | |
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19 along with XEmacs. If not, see <http://www.gnu.org/licenses/>. */ |
| 428 | 20 |
| 21 /* Synched up with: FSF 19.28. */ | |
| 22 | |
| 23 /* This file has been Mule-ized. */ | |
| 24 | |
| 25 #include <config.h> | |
| 26 #include "lisp.h" | |
| 27 | |
| 28 #include "buffer.h" | |
| 29 #include "syntax.h" | |
| 460 | 30 #include "extents.h" |
| 428 | 31 |
| 460 | 32 #define ST_COMMENT_STYLE 0x101 |
| 33 #define ST_STRING_STYLE 0x102 | |
| 34 | |
| 35 Lisp_Object Qsyntax_table; | |
| 36 int lookup_syntax_properties; | |
| 37 | |
| 428 | 38 Lisp_Object Qsyntax_table_p; |
| 39 | |
| 40 int words_include_escapes; | |
| 41 | |
| 42 int parse_sexp_ignore_comments; | |
| 43 | |
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44 /* Tell the regex routines not to QUIT. Normally there is a QUIT each |
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45 iteration in re_search_2(). We do it this way rather than change |
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46 the arguments to re_search_2() in an attempt to maintain some call |
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47 compatibility with other versions of the regex code. |
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48 #### Surely this is no longer a consideration. Last sync was 19.28! */ |
| 428 | 49 int no_quit_in_re_search; |
| 50 | |
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51 /* The standard syntax table is automatically used in all new buffers. */ |
| 428 | 52 Lisp_Object Vstandard_syntax_table; |
| 53 | |
| 54 Lisp_Object Vsyntax_designator_chars_string; | |
| 55 | |
| 826 | 56 Lisp_Object Vtemp_table_for_use_updating_syntax_tables; |
| 57 | |
| 1296 | 58 /* A value that is guaranteed not be in a syntax table. */ |
| 59 Lisp_Object Vbogus_syntax_table_value; | |
| 60 | |
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61 Lisp_Object Qscan_error; |
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62 |
| 826 | 63 static void syntax_cache_table_was_changed (struct buffer *buf); |
| 64 | |
| 428 | 65 /* This is the internal form of the parse state used in parse-partial-sexp. */ |
| 66 | |
| 67 struct lisp_parse_state | |
| 68 { | |
| 69 int depth; /* Depth at end of parsing */ | |
| 867 | 70 Ichar instring; /* -1 if not within string, else desired terminator */ |
| 428 | 71 int incomment; /* Nonzero if within a comment at end of parsing */ |
| 460 | 72 int comstyle; /* comment style a=0, or b=1, or ST_COMMENT_STYLE */ |
| 428 | 73 int quoted; /* Nonzero if just after an escape char at end of |
| 74 parsing */ | |
| 665 | 75 Charbpos thislevelstart;/* Char number of most recent start-of-expression |
| 428 | 76 at current level */ |
| 665 | 77 Charbpos prevlevelstart;/* Char number of start of containing expression */ |
| 78 Charbpos location; /* Char number at which parsing stopped */ | |
| 428 | 79 int mindepth; /* Minimum depth seen while scanning */ |
| 826 | 80 Charbpos comstr_start;/* Position just after last comment/string starter */ |
| 81 Lisp_Object levelstarts;/* Char numbers of starts-of-expression | |
| 82 of levels (starting from outermost). */ | |
| 428 | 83 }; |
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84 |
| 428 | 85 |
| 86 /* These variables are a cache for finding the start of a defun. | |
| 87 find_start_pos is the place for which the defun start was found. | |
| 88 find_start_value is the defun start position found for it. | |
| 89 find_start_buffer is the buffer it was found in. | |
| 90 find_start_begv is the BEGV value when it was found. | |
| 91 find_start_modiff is the value of MODIFF when it was found. */ | |
| 92 | |
| 665 | 93 static Charbpos find_start_pos; |
| 94 static Charbpos find_start_value; | |
| 428 | 95 static struct buffer *find_start_buffer; |
| 665 | 96 static Charbpos find_start_begv; |
| 428 | 97 static int find_start_modiff; |
| 98 | |
| 99 /* Find a defun-start that is the last one before POS (or nearly the last). | |
| 100 We record what we find, so that another call in the same area | |
| 101 can return the same value right away. */ | |
| 102 | |
| 665 | 103 static Charbpos |
| 104 find_defun_start (struct buffer *buf, Charbpos pos) | |
| 428 | 105 { |
| 665 | 106 Charbpos tem; |
| 826 | 107 struct syntax_cache *scache; |
| 108 | |
| 428 | 109 /* Use previous finding, if it's valid and applies to this inquiry. */ |
| 110 if (buf == find_start_buffer | |
| 111 /* Reuse the defun-start even if POS is a little farther on. | |
| 112 POS might be in the next defun, but that's ok. | |
| 113 Our value may not be the best possible, but will still be usable. */ | |
| 114 && pos <= find_start_pos + 1000 | |
| 115 && pos >= find_start_value | |
| 116 && BUF_BEGV (buf) == find_start_begv | |
| 117 && BUF_MODIFF (buf) == find_start_modiff) | |
| 118 return find_start_value; | |
| 119 | |
| 120 /* Back up to start of line. */ | |
| 121 tem = find_next_newline (buf, pos, -1); | |
| 122 | |
| 826 | 123 scache = setup_buffer_syntax_cache (buf, tem, 1); |
| 428 | 124 while (tem > BUF_BEGV (buf)) |
| 125 { | |
| 826 | 126 UPDATE_SYNTAX_CACHE_BACKWARD (scache, tem); |
| 460 | 127 |
| 428 | 128 /* Open-paren at start of line means we found our defun-start. */ |
| 826 | 129 if (SYNTAX_FROM_CACHE (scache, BUF_FETCH_CHAR (buf, tem)) == Sopen) |
| 428 | 130 break; |
| 131 /* Move to beg of previous line. */ | |
| 132 tem = find_next_newline (buf, tem, -2); | |
| 133 } | |
| 134 | |
| 135 /* Record what we found, for the next try. */ | |
| 136 find_start_value = tem; | |
| 137 find_start_buffer = buf; | |
| 138 find_start_modiff = BUF_MODIFF (buf); | |
| 139 find_start_begv = BUF_BEGV (buf); | |
| 140 find_start_pos = pos; | |
| 141 | |
| 142 return find_start_value; | |
| 143 } | |
| 144 | |
| 145 DEFUN ("syntax-table-p", Fsyntax_table_p, 1, 1, 0, /* | |
| 444 | 146 Return t if OBJECT is a syntax table. |
| 428 | 147 */ |
| 444 | 148 (object)) |
| 428 | 149 { |
| 444 | 150 return (CHAR_TABLEP (object) |
| 151 && XCHAR_TABLE_TYPE (object) == CHAR_TABLE_TYPE_SYNTAX) | |
| 428 | 152 ? Qt : Qnil; |
| 153 } | |
| 154 | |
| 155 static Lisp_Object | |
| 156 check_syntax_table (Lisp_Object obj, Lisp_Object default_) | |
| 157 { | |
| 158 if (NILP (obj)) | |
| 159 obj = default_; | |
| 160 while (NILP (Fsyntax_table_p (obj))) | |
| 161 obj = wrong_type_argument (Qsyntax_table_p, obj); | |
| 162 return obj; | |
| 163 } | |
| 164 | |
| 165 DEFUN ("syntax-table", Fsyntax_table, 0, 1, 0, /* | |
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166 Return the current syntax table of BUFFER. |
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167 BUFFER defaults to the current buffer. |
| 428 | 168 */ |
| 169 (buffer)) | |
| 170 { | |
| 171 return decode_buffer (buffer, 0)->syntax_table; | |
| 172 } | |
| 173 | |
| 826 | 174 #ifdef DEBUG_XEMACS |
| 175 | |
| 176 DEFUN ("mirror-syntax-table", Fmirror_syntax_table, 0, 1, 0, /* | |
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177 Return the current mirror syntax table of BUFFER. |
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178 BUFFER defaults to the current buffer. Only useful in debugging internals. |
| 826 | 179 */ |
| 180 (buffer)) | |
| 181 { | |
| 182 return decode_buffer (buffer, 0)->mirror_syntax_table; | |
| 183 } | |
| 184 | |
| 185 DEFUN ("syntax-cache-info", Fsyntax_cache_info, 0, 1, 0, /* | |
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186 Return a list (START END PREV_CHANGE NEXT_CHANGE) for BUFFER's syntax cache. |
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187 BUFFER defaults to the current buffer. |
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188 |
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189 The elements correspond to members of struct syntax_cache of the same names. |
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190 START and END should be markers. PREV_CHANGE and NEXT_CHANGE are integers. |
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191 Only useful in debugging internals. |
| 826 | 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, /* |
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204 Return the standard syntax table, used for new buffers. |
| 428 | 205 */ |
| 206 ()) | |
| 207 { | |
| 208 return Vstandard_syntax_table; | |
| 209 } | |
| 210 | |
| 211 DEFUN ("copy-syntax-table", Fcopy_syntax_table, 0, 1, 0, /* | |
| 444 | 212 Return a new syntax table which is a copy of SYNTAX-TABLE. |
| 213 SYNTAX-TABLE defaults to the standard syntax table. | |
| 428 | 214 */ |
| 444 | 215 (syntax_table)) |
| 428 | 216 { |
| 217 if (NILP (Vstandard_syntax_table)) | |
| 218 return Fmake_char_table (Qsyntax); | |
| 219 | |
| 444 | 220 syntax_table = check_syntax_table (syntax_table, Vstandard_syntax_table); |
| 221 return Fcopy_char_table (syntax_table); | |
| 428 | 222 } |
| 223 | |
| 224 DEFUN ("set-syntax-table", Fset_syntax_table, 1, 2, 0, /* | |
| 444 | 225 Select SYNTAX-TABLE as the new syntax table for BUFFER. |
| 428 | 226 BUFFER defaults to the current buffer if omitted. |
| 227 */ | |
| 444 | 228 (syntax_table, buffer)) |
| 428 | 229 { |
| 230 struct buffer *buf = decode_buffer (buffer, 0); | |
| 444 | 231 syntax_table = check_syntax_table (syntax_table, Qnil); |
| 232 buf->syntax_table = syntax_table; | |
| 233 buf->mirror_syntax_table = XCHAR_TABLE (syntax_table)->mirror_table; | |
| 826 | 234 syntax_cache_table_was_changed (buf); |
| 428 | 235 /* Indicate that this buffer now has a specified syntax table. */ |
| 236 buf->local_var_flags |= XINT (buffer_local_flags.syntax_table); | |
| 444 | 237 return syntax_table; |
| 428 | 238 } |
| 3252 | 239 |
| 240 | |
| 428 | 241 |
| 3252 | 242 /* |
| 243 * Syntax caching | |
| 244 */ | |
| 245 | |
| 246 /* syntax_cache object implementation */ | |
| 247 | |
| 248 static const struct memory_description syntax_cache_description_1 [] = { | |
| 249 { XD_LISP_OBJECT, offsetof (struct syntax_cache, object) }, | |
| 250 { XD_LISP_OBJECT, offsetof (struct syntax_cache, buffer) }, | |
| 251 { XD_LISP_OBJECT, offsetof (struct syntax_cache, syntax_table) }, | |
| 252 { XD_LISP_OBJECT, offsetof (struct syntax_cache, mirror_table) }, | |
| 253 { XD_LISP_OBJECT, offsetof (struct syntax_cache, start) }, | |
| 254 { XD_LISP_OBJECT, offsetof (struct syntax_cache, end) }, | |
| 255 { XD_END } | |
| 256 }; | |
| 257 | |
| 258 #ifdef NEW_GC | |
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259 DEFINE_DUMPABLE_INTERNAL_LISP_OBJECT ("syntax-cache", syntax_cache, |
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260 0, syntax_cache_description_1, |
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261 Lisp_Syntax_Cache); |
| 3252 | 262 #else /* not NEW_GC */ |
| 263 | |
| 264 const struct sized_memory_description syntax_cache_description = { | |
| 265 sizeof (struct syntax_cache), | |
| 266 syntax_cache_description_1 | |
| 267 }; | |
| 268 #endif /* not NEW_GC */ | |
| 269 | |
| 270 /* static syntax cache utilities */ | |
| 271 | |
| 272 static void | |
| 273 syntax_cache_table_was_changed (struct buffer *buf) | |
| 274 { | |
| 275 struct syntax_cache *cache = buf->syntax_cache; | |
| 276 if (cache->no_syntax_table_prop) | |
| 277 { | |
| 278 cache->syntax_table = | |
| 279 BUFFER_SYNTAX_TABLE (buf); | |
| 280 cache->mirror_table = | |
| 281 BUFFER_MIRROR_SYNTAX_TABLE (buf); | |
| 282 } | |
| 283 } | |
| 284 | |
| 285 static void | |
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286 reset_syntax_cache_range (struct syntax_cache *cache, /* initialized cache */ |
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287 Lisp_Object object) /* string or buffer */ |
| 3252 | 288 { |
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289 /* reinitialize cache parameters */ |
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290 if (BUFFERP (object)) |
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291 { |
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292 /* make known region zero-length and reset insertion behavior */ |
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293 Fset_marker (cache->start, make_int (1), object); |
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294 Fset_marker (cache->end, make_int (1), object); |
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295 Fset_marker_insertion_type (cache->start, Qt); |
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296 Fset_marker_insertion_type (cache->end, Qnil); |
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297 } |
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298 else |
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299 { |
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300 /* invalidate the known region markers */ |
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301 Fset_marker (cache->start, Qnil, Qnil); |
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302 Fset_marker (cache->end, Qnil, Qnil); |
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303 } |
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304 cache->no_syntax_table_prop = 1; |
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305 if (lookup_syntax_properties) |
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306 { |
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307 cache->prev_change = -1; |
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308 cache->next_change = -1; |
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309 } |
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310 else |
| 3252 | 311 { |
| 312 cache->prev_change = EMACS_INT_MIN; | |
| 313 cache->next_change = EMACS_INT_MAX; | |
| 314 } | |
| 315 } | |
| 826 | 316 |
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317 /* init_syntax_cache |
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318 Arguments: |
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319 cache: pointer to a zero-ed struct syntax_cache |
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320 object: a Lisp string or buffer |
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321 buffer: NULL or the struct buffer of buffer */ |
| 826 | 322 static void |
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323 init_syntax_cache (struct syntax_cache *cache, /* cache must be zero'ed */ |
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324 Lisp_Object object, /* string or buffer */ |
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325 struct buffer *buffer) /* may not be NULL */ |
| 826 | 326 { |
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327 /* initialize cache resources */ |
| 826 | 328 cache->object = object; |
| 329 cache->buffer = buffer; | |
| 1296 | 330 cache->syntax_table = |
| 331 BUFFER_SYNTAX_TABLE (cache->buffer); | |
| 332 cache->mirror_table = | |
| 826 | 333 BUFFER_MIRROR_SYNTAX_TABLE (cache->buffer); |
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334 cache->start = Fmake_marker(); |
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335 cache->end = Fmake_marker(); |
| 826 | 336 } |
| 337 | |
| 3252 | 338 /* external syntax cache API */ |
| 339 | |
| 3250 | 340 struct syntax_cache * /* return CACHE or the cache of OBJECT */ |
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341 setup_syntax_cache (struct syntax_cache *cache, /* may be NULL only if |
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342 OBJECT is a buffer */ |
| 3250 | 343 Lisp_Object object, /* the object (if any) cache |
| 344 is associated with */ | |
| 345 struct buffer *buffer, /* the buffer to use as source | |
| 346 of the syntax table */ | |
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347 Charxpos UNUSED (from), /* initial position of cache */ |
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348 int UNUSED (count)) /* direction? see code */ |
| 826 | 349 { |
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350 /* If OBJECT is a buffer, use its cache, otherwise use CACHE. |
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351 Initialize CACHE. Invalidate the cache if the syntax-table property is |
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352 being respected, otherwise make it valid for the whole object. */ |
| 826 | 353 if (BUFFERP (object)) |
| 3250 | 354 { |
| 355 cache = XBUFFER (object)->syntax_cache; | |
| 356 } | |
| 357 else | |
| 826 | 358 { |
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359 xzero (*cache); |
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360 init_syntax_cache (cache, object, buffer); |
| 826 | 361 } |
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362 reset_syntax_cache_range (cache, object); |
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363 |
| 1296 | 364 #ifdef NOT_WORTH_THE_EFFORT |
| 365 update_mirror_syntax_if_dirty (cache->mirror_table); | |
| 366 #endif /* NOT_WORTH_THE_EFFORT */ | |
| 826 | 367 return cache; |
| 368 } | |
| 369 | |
| 370 struct syntax_cache * | |
| 371 setup_buffer_syntax_cache (struct buffer *buffer, Charxpos from, int count) | |
| 372 { | |
| 373 return setup_syntax_cache (NULL, wrap_buffer (buffer), buffer, from, count); | |
| 374 } | |
| 375 | |
| 460 | 376 /* |
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377 Update syntax_cache CACHE to an appropriate setting for position CPOS. |
| 460 | 378 |
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379 The sign of COUNT gives the relative position of CPOS wrt the |
| 460 | 380 previously valid interval. (not currently used) |
| 381 | |
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382 `syntax_cache.*_change' are the next and previous positions at which |
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383 syntax_code and c_s_t will need to be recalculated. |
| 460 | 384 |
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385 #### Currently this code uses `get-char-property', which will return |
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386 the "last smallest" extent at a given position. In cases where |
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387 overlapping extents are defined, this code will simply use whatever |
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388 is returned by get-char-property. */ |
| 460 | 389 |
| 390 void | |
| 2286 | 391 update_syntax_cache (struct syntax_cache *cache, Charxpos cpos, |
| 392 int UNUSED (count)) | |
| 460 | 393 { |
| 394 Lisp_Object tmp_table; | |
| 826 | 395 Bytexpos pos; |
| 396 Bytexpos lim; | |
| 397 Bytexpos next, prev; | |
| 398 int at_begin = 0, at_end = 0; | |
| 460 | 399 |
| 826 | 400 if (NILP (cache->object)) |
| 401 return; | |
| 402 | |
| 403 pos = buffer_or_string_charxpos_to_bytexpos (cache->object, cpos); | |
| 404 | |
| 405 tmp_table = get_char_property (pos, Qsyntax_table, cache->object, | |
| 406 EXTENT_AT_AFTER, 0); | |
| 2506 | 407 lim = next_previous_single_property_change (pos, Qsyntax_table, |
| 408 cache->object, -1, 1, 0); | |
| 826 | 409 if (lim < 0) |
| 460 | 410 { |
| 826 | 411 next = buffer_or_string_absolute_end_byte (cache->object); |
| 412 at_begin = 1; | |
| 460 | 413 } |
| 826 | 414 else |
| 415 next = lim; | |
| 460 | 416 |
| 826 | 417 if (pos < buffer_or_string_absolute_end_byte (cache->object)) |
| 418 pos = next_bytexpos (cache->object, pos); | |
| 2506 | 419 lim = next_previous_single_property_change (pos, Qsyntax_table, |
| 420 cache->object, -1, 0, 0); | |
| 826 | 421 if (lim < 0) |
| 460 | 422 { |
| 826 | 423 prev = buffer_or_string_absolute_begin_byte (cache->object); |
| 424 at_end = 1; | |
| 460 | 425 } |
| 426 else | |
| 826 | 427 prev = lim; |
| 460 | 428 |
| 826 | 429 cache->prev_change = |
| 430 buffer_or_string_bytexpos_to_charxpos (cache->object, prev); | |
| 431 cache->next_change = | |
| 432 buffer_or_string_bytexpos_to_charxpos (cache->object, next); | |
| 460 | 433 |
| 826 | 434 if (BUFFERP (cache->object)) |
| 435 { | |
| 436 /* If we are at the beginning or end of buffer, check to see if there's | |
| 437 a zero-length `syntax-table' extent there (highly unlikely); if not, | |
| 438 then we can safely make the end closed, so it will take in newly | |
| 439 inserted text. (If such an extent is inserted, we will be informed | |
| 3250 | 440 through signal_syntax_cache_extent_changed().) */ |
| 826 | 441 Fset_marker (cache->start, make_int (cache->prev_change), cache->object); |
| 442 Fset_marker_insertion_type | |
| 443 (cache->start, | |
| 444 at_begin && NILP (extent_at (prev, cache->object, Qsyntax_table, | |
| 445 NULL, EXTENT_AT_AT, 0)) | |
| 446 ? Qnil : Qt); | |
| 447 Fset_marker (cache->end, make_int (cache->next_change), cache->object); | |
| 448 Fset_marker_insertion_type | |
| 449 (cache->end, | |
| 450 at_end && NILP (extent_at (next, cache->object, Qsyntax_table, | |
| 451 NULL, EXTENT_AT_AT, 0)) | |
| 452 ? Qt : Qnil); | |
| 453 } | |
| 454 | |
| 455 if (!NILP (Fsyntax_table_p (tmp_table))) | |
| 456 { | |
| 457 cache->use_code = 0; | |
| 1296 | 458 cache->syntax_table = tmp_table; |
| 459 cache->mirror_table = XCHAR_TABLE (tmp_table)->mirror_table; | |
| 826 | 460 cache->no_syntax_table_prop = 0; |
| 1296 | 461 #ifdef NOT_WORTH_THE_EFFORT |
| 462 update_mirror_syntax_if_dirty (cache->mirror_table); | |
| 463 #endif /* NOT_WORTH_THE_EFFORT */ | |
| 826 | 464 } |
| 465 else if (CONSP (tmp_table) && INTP (XCAR (tmp_table))) | |
| 466 { | |
| 467 cache->use_code = 1; | |
| 468 cache->syntax_code = XINT (XCAR (tmp_table)); | |
| 469 cache->no_syntax_table_prop = 0; | |
| 470 } | |
| 471 else | |
| 472 { | |
| 473 cache->use_code = 0; | |
| 474 cache->no_syntax_table_prop = 1; | |
| 1296 | 475 cache->syntax_table = BUFFER_SYNTAX_TABLE (cache->buffer); |
| 476 cache->mirror_table = BUFFER_MIRROR_SYNTAX_TABLE (cache->buffer); | |
| 477 #ifdef NOT_WORTH_THE_EFFORT | |
| 478 update_mirror_syntax_if_dirty (cache->mirror_table); | |
| 479 #endif /* NOT_WORTH_THE_EFFORT */ | |
| 460 | 480 } |
| 481 } | |
| 3252 | 482 |
| 483 /* buffer-specific APIs used in buffer.c | |
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484 #### Really unclean; the syntax cache should just be a LISP object. */ |
| 3252 | 485 |
| 486 void | |
| 487 mark_buffer_syntax_cache (struct buffer *buf) | |
| 488 { | |
| 489 struct syntax_cache *cache = buf->syntax_cache; | |
| 490 if (!cache) /* Vbuffer_defaults and such don't have caches */ | |
| 491 return; | |
| 492 mark_object (cache->object); | |
| 493 if (cache->buffer) | |
| 494 mark_object (wrap_buffer (cache->buffer)); | |
| 495 mark_object (cache->syntax_table); | |
| 496 mark_object (cache->mirror_table); | |
| 497 mark_object (cache->start); | |
| 498 mark_object (cache->end); | |
| 499 } | |
| 500 | |
| 501 void | |
| 502 init_buffer_syntax_cache (struct buffer *buf) | |
| 503 { | |
| 504 #ifdef NEW_GC | |
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505 buf->syntax_cache = XSYNTAX_CACHE (ALLOC_NORMAL_LISP_OBJECT (syntax_cache)); |
| 3252 | 506 #else /* not NEW_GC */ |
| 507 buf->syntax_cache = xnew_and_zero (struct syntax_cache); | |
| 508 #endif /* not NEW_GC */ | |
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509 |
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510 init_syntax_cache (buf->syntax_cache, wrap_buffer(buf), buf); |
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511 reset_syntax_cache_range (buf->syntax_cache, wrap_buffer(buf)); |
| 3252 | 512 } |
| 513 | |
| 514 /* finalize the syntax cache for BUF */ | |
| 515 | |
| 516 void | |
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517 uninit_buffer_syntax_cache (struct buffer *UNUSED_IF_NEW_GC (buf)) |
| 3252 | 518 { |
| 4141 | 519 #ifndef NEW_GC |
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520 if (buf->syntax_cache) |
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521 { |
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522 xfree (buf->syntax_cache); |
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523 buf->syntax_cache = 0; |
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524 } |
| 4141 | 525 #endif /* not NEW_GC */ |
| 3252 | 526 } |
| 527 | |
| 528 /* extent-specific APIs used in extents.c and insdel.c */ | |
| 529 | |
| 530 /* The syntax-table property on the range covered by EXTENT may be changing, | |
| 531 either because EXTENT has a syntax-table property and is being attached | |
| 532 or detached (this includes having its endpoints changed), or because | |
| 533 the value of EXTENT's syntax-table property is changing. */ | |
| 534 | |
| 535 void | |
| 536 signal_syntax_cache_extent_changed (EXTENT extent) | |
| 537 { | |
| 538 Lisp_Object buffer = Fextent_object (wrap_extent (extent)); | |
| 539 if (BUFFERP (buffer)) | |
| 540 { | |
| 541 struct syntax_cache *cache = XBUFFER (buffer)->syntax_cache; | |
| 542 Bytexpos start = extent_endpoint_byte (extent, 0); | |
| 543 Bytexpos end = extent_endpoint_byte (extent, 1); | |
| 544 Bytexpos start2 = byte_marker_position (cache->start); | |
| 545 Bytexpos end2 = byte_marker_position (cache->end); | |
| 546 /* If the extent is entirely before or entirely after the cache | |
| 547 range, it doesn't overlap. Otherwise, invalidate the range. */ | |
| 548 if (!(end < start2 || start > end2)) | |
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549 reset_syntax_cache_range (cache, buffer); |
| 3252 | 550 } |
| 551 } | |
| 552 | |
| 553 /* Extents have been adjusted for insertion or deletion, so we need to | |
| 554 refetch the start and end position of the extent */ | |
| 555 void | |
| 556 signal_syntax_cache_extent_adjust (struct buffer *buf) | |
| 557 { | |
| 558 struct syntax_cache *cache = buf->syntax_cache; | |
| 559 /* If the cache was invalid before, leave it that way. We only want | |
| 560 to update the limits of validity when they were actually valid. */ | |
| 561 if (cache->prev_change < 0) | |
| 562 return; | |
| 563 cache->prev_change = marker_position (cache->start); | |
| 564 cache->next_change = marker_position (cache->end); | |
| 565 } | |
| 566 | |
| 567 | |
| 460 | 568 |
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569 /* Convert an ASCII character which represents a syntax class |
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570 into the corresponding syntax code. |
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571 This is used by (search.c) skip_chars and (regex.c) regex_compile. |
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572 regex_compile indexes with `c' of type int, but promises that it |
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573 is positive. |
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574 #### skip_chars indexes with an Ichar, a signed type. Presumably |
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575 this is guaranteed non-negative. */ |
| 428 | 576 |
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577 const unsigned char syntax_spec_code[0200] = |
| 428 | 578 { 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, |
| 579 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
| 580 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
| 581 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
| 582 (char) Swhitespace, 0377, (char) Sstring, 0377, | |
| 583 (char) Smath, 0377, 0377, (char) Squote, | |
| 584 (char) Sopen, (char) Sclose, 0377, 0377, | |
| 585 0377, (char) Swhitespace, (char) Spunct, (char) Scharquote, | |
| 586 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
| 587 0377, 0377, 0377, 0377, | |
| 588 (char) Scomment, 0377, (char) Sendcomment, 0377, | |
| 589 (char) Sinherit, 0377, 0377, 0377, 0377, 0377, 0377, 0377, /* @, A ... */ | |
| 590 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
| 591 0377, 0377, 0377, 0377, 0377, 0377, 0377, (char) Sword, | |
| 592 0377, 0377, 0377, 0377, (char) Sescape, 0377, 0377, (char) Ssymbol, | |
| 593 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, /* `, a, ... */ | |
| 594 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, | |
| 595 0377, 0377, 0377, 0377, 0377, 0377, 0377, (char) Sword, | |
| 460 | 596 0377, 0377, 0377, 0377, (char) Sstring_fence, 0377, 0377, 0377 |
| 428 | 597 }; |
| 598 | |
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599 /* The inverse mapping for syntax_spec_code. */ |
| 460 | 600 const unsigned char syntax_code_spec[] = " .w_()'\"$\\/<>@!|"; |
| 428 | 601 |
| 602 DEFUN ("syntax-designator-chars", Fsyntax_designator_chars, 0, 0, 0, /* | |
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603 Return the string of the recognized syntax designator chars. |
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604 The chars are indexed by their internal syntax codes, starting at 0. |
| 428 | 605 */ |
| 606 ()) | |
| 607 { | |
| 608 return Vsyntax_designator_chars_string; | |
| 609 } | |
| 610 | |
| 611 DEFUN ("char-syntax", Fchar_syntax, 1, 2, 0, /* | |
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612 Return the syntax code of CHARACTER, designated by a character. |
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613 Optional SYNTAX-TABLE defaults to the current buffer's syntax table. |
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614 See `modify-syntax-entry' for the designators of the defined syntax codes. |
| 428 | 615 */ |
| 444 | 616 (character, syntax_table)) |
| 428 | 617 { |
| 826 | 618 Lisp_Object mirrortab; |
| 428 | 619 |
| 444 | 620 if (NILP (character)) |
| 428 | 621 { |
| 444 | 622 character = make_char ('\000'); |
| 428 | 623 } |
| 444 | 624 CHECK_CHAR_COERCE_INT (character); |
| 826 | 625 syntax_table = check_syntax_table (syntax_table, |
| 626 current_buffer->syntax_table); | |
| 627 mirrortab = XCHAR_TABLE (syntax_table)->mirror_table; | |
| 628 return make_char (syntax_code_spec[(int) SYNTAX (mirrortab, | |
| 629 XCHAR (character))]); | |
| 428 | 630 } |
| 631 | |
| 632 #ifdef MULE | |
| 633 | |
| 634 enum syntaxcode | |
| 2286 | 635 charset_syntax (struct buffer *UNUSED (buf), Lisp_Object UNUSED (charset), |
| 636 int *multi_p_out) | |
| 428 | 637 { |
| 638 *multi_p_out = 1; | |
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639 /* !!#### get this right |
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640 Maybe not worth it until we have Unicode inside. */ |
| 3152 | 641 return Sword; |
| 428 | 642 } |
| 643 | |
| 644 #endif | |
| 645 | |
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646 /* #### Outside of this file, only used once, in font-lock.c. Make static? |
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647 If so, remove prototype from syntax.h. */ |
| 428 | 648 Lisp_Object |
| 867 | 649 syntax_match (Lisp_Object syntax_table, Ichar ch) |
| 428 | 650 { |
| 826 | 651 Lisp_Object code = get_char_table (ch, syntax_table); |
| 428 | 652 Lisp_Object code2 = code; |
| 653 | |
| 654 if (CONSP (code)) | |
| 655 code2 = XCAR (code); | |
| 656 if (SYNTAX_FROM_CODE (XINT (code2)) == Sinherit) | |
| 826 | 657 code = get_char_table (ch, Vstandard_syntax_table); |
| 428 | 658 |
| 659 return CONSP (code) ? XCDR (code) : Qnil; | |
| 660 } | |
| 661 | |
| 662 DEFUN ("matching-paren", Fmatching_paren, 1, 2, 0, /* | |
| 444 | 663 Return the matching parenthesis of CHARACTER, or nil if none. |
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664 Optional SYNTAX-TABLE defaults to the current buffer's syntax table. |
| 428 | 665 */ |
| 444 | 666 (character, syntax_table)) |
| 428 | 667 { |
| 826 | 668 Lisp_Object mirrortab; |
| 1315 | 669 enum syntaxcode code; |
| 428 | 670 |
| 444 | 671 CHECK_CHAR_COERCE_INT (character); |
| 826 | 672 syntax_table = check_syntax_table (syntax_table, |
| 673 current_buffer->syntax_table); | |
| 674 mirrortab = XCHAR_TABLE (syntax_table)->mirror_table; | |
| 444 | 675 code = SYNTAX (mirrortab, XCHAR (character)); |
| 428 | 676 if (code == Sopen || code == Sclose || code == Sstring) |
| 444 | 677 return syntax_match (syntax_table, XCHAR (character)); |
| 428 | 678 return Qnil; |
| 679 } | |
| 680 | |
| 681 | |
| 682 | |
| 683 #ifdef MULE | |
| 684 /* Return 1 if there is a word boundary between two word-constituent | |
| 685 characters C1 and C2 if they appear in this order, else return 0. | |
| 686 There is no word boundary between two word-constituent ASCII | |
| 687 characters. */ | |
| 688 #define WORD_BOUNDARY_P(c1, c2) \ | |
| 867 | 689 (!(ichar_ascii_p (c1) && ichar_ascii_p (c2)) \ |
| 428 | 690 && word_boundary_p (c1, c2)) |
| 691 #endif | |
| 692 | |
| 693 /* Return the position across COUNT words from FROM. | |
| 694 If that many words cannot be found before the end of the buffer, return 0. | |
| 695 COUNT negative means scan backward and stop at word beginning. */ | |
| 696 | |
| 665 | 697 Charbpos |
| 698 scan_words (struct buffer *buf, Charbpos from, int count) | |
| 428 | 699 { |
| 665 | 700 Charbpos limit = count > 0 ? BUF_ZV (buf) : BUF_BEGV (buf); |
| 867 | 701 Ichar ch0, ch1; |
| 428 | 702 enum syntaxcode code; |
| 826 | 703 struct syntax_cache *scache = setup_buffer_syntax_cache (buf, from, count); |
| 460 | 704 |
| 428 | 705 /* #### is it really worth it to hand expand both cases? JV */ |
| 706 while (count > 0) | |
| 707 { | |
| 708 QUIT; | |
| 709 | |
| 710 while (1) | |
| 711 { | |
| 712 if (from == limit) | |
| 713 return 0; | |
| 714 | |
| 826 | 715 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 428 | 716 ch0 = BUF_FETCH_CHAR (buf, from); |
| 826 | 717 code = SYNTAX_FROM_CACHE (scache, ch0); |
| 428 | 718 |
| 442 | 719 from++; |
| 428 | 720 if (words_include_escapes |
| 721 && (code == Sescape || code == Scharquote)) | |
| 722 break; | |
| 723 if (code == Sword) | |
| 724 break; | |
| 725 } | |
| 726 | |
| 727 QUIT; | |
| 728 | |
| 729 while (from != limit) | |
| 730 { | |
| 826 | 731 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 428 | 732 ch1 = BUF_FETCH_CHAR (buf, from); |
| 826 | 733 code = SYNTAX_FROM_CACHE (scache, ch1); |
| 428 | 734 if (!(words_include_escapes |
| 735 && (code == Sescape || code == Scharquote))) | |
| 736 if (code != Sword | |
| 737 #ifdef MULE | |
| 738 || WORD_BOUNDARY_P (ch0, ch1) | |
| 434 | 739 #endif |
| 428 | 740 ) |
| 741 break; | |
| 742 #ifdef MULE | |
| 743 ch0 = ch1; | |
| 434 | 744 #endif |
| 428 | 745 from++; |
| 746 } | |
| 747 count--; | |
| 748 } | |
| 749 | |
| 750 while (count < 0) | |
| 751 { | |
| 752 QUIT; | |
| 753 | |
| 754 while (1) | |
| 755 { | |
| 756 if (from == limit) | |
| 757 return 0; | |
| 758 | |
| 826 | 759 UPDATE_SYNTAX_CACHE_BACKWARD (scache, from - 1); |
| 428 | 760 ch1 = BUF_FETCH_CHAR (buf, from - 1); |
| 826 | 761 code = SYNTAX_FROM_CACHE (scache, ch1); |
| 460 | 762 from--; |
| 442 | 763 |
| 428 | 764 if (words_include_escapes |
| 765 && (code == Sescape || code == Scharquote)) | |
| 766 break; | |
| 767 if (code == Sword) | |
| 768 break; | |
| 769 } | |
| 770 | |
| 771 QUIT; | |
| 772 | |
| 773 while (from != limit) | |
| 774 { | |
| 826 | 775 UPDATE_SYNTAX_CACHE_BACKWARD (scache, from - 1); |
| 428 | 776 ch0 = BUF_FETCH_CHAR (buf, from - 1); |
| 826 | 777 code = SYNTAX_FROM_CACHE (scache, ch0); |
| 460 | 778 |
| 428 | 779 if (!(words_include_escapes |
| 780 && (code == Sescape || code == Scharquote))) | |
| 781 if (code != Sword | |
| 782 #ifdef MULE | |
| 783 || WORD_BOUNDARY_P (ch0, ch1) | |
| 784 #endif | |
| 785 ) | |
| 786 break; | |
| 787 #ifdef MULE | |
| 788 ch1 = ch0; | |
| 789 #endif | |
| 790 from--; | |
| 791 } | |
| 792 count++; | |
| 793 } | |
| 794 | |
| 795 return from; | |
| 796 } | |
| 797 | |
| 446 | 798 DEFUN ("forward-word", Fforward_word, 0, 2, "_p", /* |
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799 Move point forward COUNT words in BUFFER (backward if COUNT is negative). |
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800 COUNT defaults to 1, and BUFFER defaults to the current buffer. |
| 428 | 801 |
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802 Return t if the motion successfully crosses COUNT words, otherwise nil (if |
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803 the motion would cross the buffer boundary). |
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804 |
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805 The characters that are moved over are added to the region if the region |
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806 is active, the Shift key is held down, a motion key is used to invoke this |
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807 command, and `shifted-motion-keys-select-region' is non-nil; see |
| 462 | 808 the documentation for this variable for more details. |
| 428 | 809 */ |
| 810 (count, buffer)) | |
| 811 { | |
| 665 | 812 Charbpos val; |
| 428 | 813 struct buffer *buf = decode_buffer (buffer, 0); |
| 446 | 814 EMACS_INT n; |
| 815 | |
| 816 if (NILP (count)) | |
| 817 n = 1; | |
| 818 else | |
| 819 { | |
| 820 CHECK_INT (count); | |
| 821 n = XINT (count); | |
| 822 } | |
| 428 | 823 |
| 446 | 824 val = scan_words (buf, BUF_PT (buf), n); |
| 825 if (val) | |
| 428 | 826 { |
| 446 | 827 BUF_SET_PT (buf, val); |
| 828 return Qt; | |
| 829 } | |
| 830 else | |
| 831 { | |
| 832 BUF_SET_PT (buf, n > 0 ? BUF_ZV (buf) : BUF_BEGV (buf)); | |
| 428 | 833 return Qnil; |
| 834 } | |
| 835 } | |
| 836 | |
| 837 static void scan_sexps_forward (struct buffer *buf, | |
| 838 struct lisp_parse_state *, | |
| 665 | 839 Charbpos from, Charbpos end, |
| 428 | 840 int targetdepth, int stopbefore, |
| 841 Lisp_Object oldstate, | |
| 842 int commentstop); | |
| 843 | |
| 844 static int | |
| 665 | 845 find_start_of_comment (struct buffer *buf, Charbpos from, Charbpos stop, |
| 460 | 846 int comstyle) |
| 428 | 847 { |
| 867 | 848 Ichar c; |
| 428 | 849 enum syntaxcode code; |
| 850 | |
| 851 /* Look back, counting the parity of string-quotes, | |
| 852 and recording the comment-starters seen. | |
| 853 When we reach a safe place, assume that's not in a string; | |
| 854 then step the main scan to the earliest comment-starter seen | |
| 855 an even number of string quotes away from the safe place. | |
| 856 | |
| 857 OFROM[I] is position of the earliest comment-starter seen | |
| 858 which is I+2X quotes from the comment-end. | |
| 859 PARITY is current parity of quotes from the comment end. */ | |
| 860 int parity = 0; | |
| 867 | 861 Ichar my_stringend = 0; |
| 428 | 862 int string_lossage = 0; |
| 665 | 863 Charbpos comment_end = from; |
| 864 Charbpos comstart_pos = 0; | |
| 428 | 865 int comstart_parity = 0; |
| 866 int styles_match_p = 0; | |
| 460 | 867 /* mask to match comment styles against; for ST_COMMENT_STYLE, this |
| 868 will get set to SYNTAX_COMMENT_STYLE_B, but never get checked */ | |
| 869 int mask = comstyle ? SYNTAX_COMMENT_STYLE_B : SYNTAX_COMMENT_STYLE_A; | |
| 826 | 870 struct syntax_cache *scache = buf->syntax_cache; |
| 428 | 871 |
| 872 /* At beginning of range to scan, we're outside of strings; | |
| 873 that determines quote parity to the comment-end. */ | |
| 874 while (from != stop) | |
| 875 { | |
| 460 | 876 int syncode; |
| 877 | |
| 428 | 878 /* Move back and examine a character. */ |
| 879 from--; | |
| 826 | 880 UPDATE_SYNTAX_CACHE_BACKWARD (scache, from); |
| 428 | 881 |
| 882 c = BUF_FETCH_CHAR (buf, from); | |
| 826 | 883 syncode = SYNTAX_CODE_FROM_CACHE (scache, c); |
| 884 code = SYNTAX_FROM_CODE (syncode); | |
| 428 | 885 |
| 886 /* is this a 1-char comment end sequence? if so, try | |
| 887 to see if style matches previously extracted mask */ | |
| 888 if (code == Sendcomment) | |
| 889 { | |
| 890 styles_match_p = | |
| 460 | 891 SYNTAX_CODE_COMMENT_1CHAR_MASK (syncode) & mask; |
| 428 | 892 } |
| 893 | |
| 894 /* or are we looking at a 1-char comment start sequence | |
| 895 of the style matching mask? */ | |
| 460 | 896 else if (code == Scomment) |
| 428 | 897 { |
| 460 | 898 styles_match_p = |
| 899 SYNTAX_CODE_COMMENT_1CHAR_MASK (syncode) & mask; | |
| 428 | 900 } |
| 901 | |
| 460 | 902 /* otherwise, is this a 2-char comment end or start sequence? */ |
| 903 else if (from > stop) | |
| 904 do | |
| 905 { | |
| 906 /* 2-char comment end sequence? */ | |
| 907 if (SYNTAX_CODE_END_SECOND_P (syncode)) | |
| 908 { | |
| 909 int prev_syncode; | |
| 826 | 910 UPDATE_SYNTAX_CACHE_BACKWARD (scache, from - 1); |
| 460 | 911 prev_syncode = |
| 1315 | 912 SYNTAX_CODE_FROM_CACHE (scache, |
| 913 BUF_FETCH_CHAR (buf, from - 1)); | |
| 460 | 914 |
| 915 if (SYNTAX_CODES_END_P (prev_syncode, syncode)) | |
| 916 { | |
| 917 code = Sendcomment; | |
| 918 styles_match_p = | |
| 826 | 919 SYNTAX_CODES_COMMENT_MASK_END (prev_syncode, |
| 920 syncode) & mask; | |
| 460 | 921 from--; |
| 826 | 922 UPDATE_SYNTAX_CACHE_BACKWARD (scache, from); |
| 460 | 923 c = BUF_FETCH_CHAR (buf, from); |
| 924 | |
| 925 /* Found a comment-end sequence, so skip past the | |
| 926 check for a comment-start */ | |
| 927 break; | |
| 928 } | |
| 929 } | |
| 930 | |
| 931 /* 2-char comment start sequence? */ | |
| 932 if (SYNTAX_CODE_START_SECOND_P (syncode)) | |
| 933 { | |
| 934 int prev_syncode; | |
| 826 | 935 UPDATE_SYNTAX_CACHE_BACKWARD (scache, from - 1); |
| 460 | 936 prev_syncode = |
| 1315 | 937 SYNTAX_CODE_FROM_CACHE (scache, |
| 938 BUF_FETCH_CHAR (buf, from - 1)); | |
| 460 | 939 |
| 940 if (SYNTAX_CODES_START_P (prev_syncode, syncode)) | |
| 941 { | |
| 942 code = Scomment; | |
| 943 styles_match_p = | |
| 826 | 944 SYNTAX_CODES_COMMENT_MASK_START (prev_syncode, |
| 945 syncode) & mask; | |
| 460 | 946 from--; |
| 826 | 947 UPDATE_SYNTAX_CACHE_BACKWARD (scache, from); |
| 460 | 948 c = BUF_FETCH_CHAR (buf, from); |
| 949 } | |
| 950 } | |
| 951 } while (0); | |
| 428 | 952 |
| 953 /* Ignore escaped characters. */ | |
| 954 if (char_quoted (buf, from)) | |
| 955 continue; | |
| 956 | |
| 957 /* Track parity of quotes. */ | |
| 958 if (code == Sstring) | |
| 959 { | |
| 960 parity ^= 1; | |
| 961 if (my_stringend == 0) | |
| 962 my_stringend = c; | |
| 963 /* If we have two kinds of string delimiters. | |
| 964 There's no way to grok this scanning backwards. */ | |
| 965 else if (my_stringend != c) | |
| 966 string_lossage = 1; | |
| 967 } | |
| 968 | |
| 460 | 969 if (code == Sstring_fence || code == Scomment_fence) |
| 970 { | |
| 971 parity ^= 1; | |
| 972 if (my_stringend == 0) | |
| 973 my_stringend = | |
| 974 code == Sstring_fence ? ST_STRING_STYLE : ST_COMMENT_STYLE; | |
| 975 /* If we have two kinds of string delimiters. | |
| 976 There's no way to grok this scanning backwards. */ | |
| 977 else if (my_stringend != (code == Sstring_fence | |
| 978 ? ST_STRING_STYLE : ST_COMMENT_STYLE)) | |
| 979 string_lossage = 1; | |
| 980 } | |
| 981 | |
| 428 | 982 /* Record comment-starters according to that |
| 983 quote-parity to the comment-end. */ | |
| 984 if (code == Scomment && styles_match_p) | |
| 985 { | |
| 986 comstart_parity = parity; | |
| 987 comstart_pos = from; | |
| 988 } | |
| 989 | |
| 990 /* If we find another earlier comment-ender, | |
| 991 any comment-starts earlier than that don't count | |
| 992 (because they go with the earlier comment-ender). */ | |
| 993 if (code == Sendcomment && styles_match_p) | |
| 994 break; | |
| 995 | |
| 996 /* Assume a defun-start point is outside of strings. */ | |
| 997 if (code == Sopen | |
| 998 && (from == stop || BUF_FETCH_CHAR (buf, from - 1) == '\n')) | |
| 999 break; | |
| 1000 } | |
| 1001 | |
| 1002 if (comstart_pos == 0) | |
| 1003 from = comment_end; | |
| 1004 /* If the earliest comment starter | |
| 1005 is followed by uniform paired string quotes or none, | |
| 1006 we know it can't be inside a string | |
| 1007 since if it were then the comment ender would be inside one. | |
| 1008 So it does start a comment. Skip back to it. */ | |
| 1009 else if (comstart_parity == 0 && !string_lossage) | |
| 1010 from = comstart_pos; | |
| 1011 else | |
| 1012 { | |
| 1013 /* We had two kinds of string delimiters mixed up | |
| 1014 together. Decode this going forwards. | |
| 1015 Scan fwd from the previous comment ender | |
| 1016 to the one in question; this records where we | |
| 1017 last passed a comment starter. */ | |
| 1018 | |
| 1019 struct lisp_parse_state state; | |
| 1020 scan_sexps_forward (buf, &state, find_defun_start (buf, comment_end), | |
| 1021 comment_end - 1, -10000, 0, Qnil, 0); | |
| 1022 if (state.incomment) | |
| 460 | 1023 from = state.comstr_start; |
| 428 | 1024 else |
| 1025 /* We can't grok this as a comment; scan it normally. */ | |
| 1026 from = comment_end; | |
| 826 | 1027 UPDATE_SYNTAX_CACHE_FORWARD (scache, from - 1); |
| 428 | 1028 } |
| 1029 return from; | |
| 1030 } | |
| 1031 | |
| 665 | 1032 static Charbpos |
| 826 | 1033 find_end_of_comment (struct buffer *buf, Charbpos from, Charbpos stop, |
| 1034 int comstyle) | |
| 428 | 1035 { |
| 1036 int c; | |
| 460 | 1037 int prev_code; |
| 1038 /* mask to match comment styles against; for ST_COMMENT_STYLE, this | |
| 1039 will get set to SYNTAX_COMMENT_STYLE_B, but never get checked */ | |
| 1040 int mask = comstyle ? SYNTAX_COMMENT_STYLE_B : SYNTAX_COMMENT_STYLE_A; | |
| 826 | 1041 struct syntax_cache *scache = buf->syntax_cache; |
| 428 | 1042 |
| 460 | 1043 /* This is only called by functions which have already set up the |
| 1044 syntax_cache and are keeping it up-to-date */ | |
| 428 | 1045 while (1) |
| 1046 { | |
| 1047 if (from == stop) | |
| 1048 { | |
| 1049 return -1; | |
| 1050 } | |
| 460 | 1051 |
| 826 | 1052 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 428 | 1053 c = BUF_FETCH_CHAR (buf, from); |
| 460 | 1054 |
| 1055 /* Test for generic comments */ | |
| 1056 if (comstyle == ST_COMMENT_STYLE) | |
| 1057 { | |
| 826 | 1058 if (SYNTAX_FROM_CACHE (scache, c) == Scomment_fence) |
| 460 | 1059 { |
| 1060 from++; | |
| 826 | 1061 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 460 | 1062 break; |
| 1063 } | |
| 1064 from++; | |
| 1065 continue; /* No need to test other comment styles in a | |
| 1066 generic comment */ | |
| 1067 } | |
| 1068 else | |
| 1069 | |
| 826 | 1070 if (SYNTAX_FROM_CACHE (scache, c) == Sendcomment |
| 460 | 1071 && SYNTAX_CODE_MATCHES_1CHAR_P |
| 826 | 1072 (SYNTAX_CODE_FROM_CACHE (scache, c), mask)) |
| 428 | 1073 /* we have encountered a comment end of the same style |
| 1074 as the comment sequence which began this comment | |
| 1075 section */ | |
| 460 | 1076 { |
| 1077 from++; | |
| 826 | 1078 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 460 | 1079 break; |
| 1080 } | |
| 428 | 1081 |
| 826 | 1082 prev_code = SYNTAX_CODE_FROM_CACHE (scache, c); |
| 428 | 1083 from++; |
| 826 | 1084 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 428 | 1085 if (from < stop |
| 460 | 1086 && SYNTAX_CODES_MATCH_END_P |
| 1087 (prev_code, | |
| 826 | 1088 SYNTAX_CODE_FROM_CACHE (scache, BUF_FETCH_CHAR (buf, from)), |
| 460 | 1089 mask) |
| 1090 | |
| 1091 ) | |
| 428 | 1092 /* we have encountered a comment end of the same style |
| 1093 as the comment sequence which began this comment | |
| 1094 section */ | |
| 460 | 1095 { |
| 1096 from++; | |
| 826 | 1097 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 460 | 1098 break; |
| 1099 } | |
| 428 | 1100 } |
| 1101 return from; | |
| 1102 } | |
| 1103 | |
| 1104 | |
| 1105 /* #### between FSF 19.23 and 19.28 there are some changes to the logic | |
| 1106 in this function (and minor changes to find_start_of_comment(), | |
| 1107 above, which is part of Fforward_comment() in FSF). Attempts to port | |
| 1108 that logic made this function break, so I'm leaving it out. If anyone | |
| 1109 ever complains about this function not working properly, take a look | |
| 1110 at those changes. --ben */ | |
| 1111 | |
| 446 | 1112 DEFUN ("forward-comment", Fforward_comment, 0, 2, 0, /* |
|
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|
1113 Move forward across COUNT comments in BUFFER (backwards if COUNT is negative). |
|
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|
1114 COUNT defaults to 1, and BUFFER defaults to the current buffer. |
|
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|
1115 |
| 428 | 1116 Stop scanning if we find something other than a comment or whitespace. |
| 1117 Set point to where scanning stops. | |
|
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|
1118 Return t if the motion successfully crosses COUNT comments, otherwise nil (if |
|
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changeset
|
1119 the motion would cross the buffer boundary or encounters a noncomment token). |
| 428 | 1120 */ |
| 444 | 1121 (count, buffer)) |
| 428 | 1122 { |
| 665 | 1123 Charbpos from; |
| 1124 Charbpos stop; | |
| 867 | 1125 Ichar c; |
| 428 | 1126 enum syntaxcode code; |
| 460 | 1127 int syncode; |
| 444 | 1128 EMACS_INT n; |
| 428 | 1129 struct buffer *buf = decode_buffer (buffer, 0); |
| 826 | 1130 struct syntax_cache *scache; |
| 1131 | |
| 446 | 1132 if (NILP (count)) |
| 1133 n = 1; | |
| 1134 else | |
| 1135 { | |
| 1136 CHECK_INT (count); | |
| 1137 n = XINT (count); | |
| 1138 } | |
| 428 | 1139 |
| 1140 from = BUF_PT (buf); | |
| 1141 | |
| 826 | 1142 scache = setup_buffer_syntax_cache (buf, from, n); |
| 444 | 1143 while (n > 0) |
| 428 | 1144 { |
| 1145 QUIT; | |
| 1146 | |
| 1147 stop = BUF_ZV (buf); | |
| 1148 while (from < stop) | |
| 1149 { | |
| 460 | 1150 int comstyle = 0; /* mask for finding matching comment style */ |
| 428 | 1151 |
| 1152 if (char_quoted (buf, from)) | |
| 1153 { | |
| 1154 from++; | |
| 1155 continue; | |
| 1156 } | |
| 1157 | |
| 826 | 1158 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 428 | 1159 c = BUF_FETCH_CHAR (buf, from); |
| 826 | 1160 syncode = SYNTAX_CODE_FROM_CACHE (scache, c); |
| 1161 code = SYNTAX_FROM_CODE (syncode); | |
| 428 | 1162 |
| 1163 if (code == Scomment) | |
| 1164 { | |
| 1165 /* we have encountered a single character comment start | |
| 1166 sequence, and we are ignoring all text inside comments. | |
| 1167 we must record the comment style this character begins | |
| 1168 so that later, only a comment end of the same style actually | |
| 1169 ends the comment section */ | |
| 460 | 1170 comstyle = SYNTAX_CODE_COMMENT_1CHAR_MASK (syncode) |
| 1171 == SYNTAX_COMMENT_STYLE_A ? 0 : 1; | |
| 428 | 1172 } |
| 1173 | |
| 460 | 1174 else if (code == Scomment_fence) |
| 1175 { | |
| 1176 from++; | |
| 1177 code = Scomment; | |
| 1178 comstyle = ST_COMMENT_STYLE; | |
| 1179 } | |
| 1180 | |
| 428 | 1181 else if (from < stop |
| 460 | 1182 && SYNTAX_CODE_START_FIRST_P (syncode)) |
| 428 | 1183 { |
| 460 | 1184 int next_syncode; |
| 826 | 1185 UPDATE_SYNTAX_CACHE_FORWARD (scache, from + 1); |
| 460 | 1186 next_syncode = |
| 826 | 1187 SYNTAX_CODE_FROM_CACHE (scache, BUF_FETCH_CHAR (buf, from + 1)); |
| 460 | 1188 |
| 1189 if (SYNTAX_CODES_START_P (syncode, next_syncode)) | |
| 1190 { | |
| 1191 /* we have encountered a 2char comment start sequence and we | |
| 1192 are ignoring all text inside comments. we must record | |
| 1193 the comment style this sequence begins so that later, | |
| 1194 only a comment end of the same style actually ends | |
| 1195 the comment section */ | |
| 1196 code = Scomment; | |
| 1197 comstyle = | |
| 1198 SYNTAX_CODES_COMMENT_MASK_START (syncode, next_syncode) | |
| 1199 == SYNTAX_COMMENT_STYLE_A ? 0 : 1; | |
| 1200 from++; | |
| 1201 } | |
| 428 | 1202 } |
| 1203 | |
| 1204 if (code == Scomment) | |
| 1205 { | |
| 826 | 1206 Charbpos newfrom = find_end_of_comment (buf, from, stop, |
| 1207 comstyle); | |
| 428 | 1208 if (newfrom < 0) |
| 1209 { | |
| 1210 /* we stopped because from==stop */ | |
| 1211 BUF_SET_PT (buf, stop); | |
| 1212 return Qnil; | |
| 1213 } | |
| 1214 from = newfrom; | |
| 1215 | |
| 1216 /* We have skipped one comment. */ | |
| 1217 break; | |
| 1218 } | |
| 1219 else if (code != Swhitespace | |
| 1220 && code != Sendcomment | |
| 1221 && code != Scomment ) | |
| 1222 { | |
| 1223 BUF_SET_PT (buf, from); | |
| 1224 return Qnil; | |
| 1225 } | |
| 1226 from++; | |
| 1227 } | |
| 1228 | |
| 1229 /* End of comment reached */ | |
| 444 | 1230 n--; |
| 428 | 1231 } |
| 1232 | |
| 444 | 1233 while (n < 0) |
| 428 | 1234 { |
| 1235 QUIT; | |
| 1236 | |
| 1237 stop = BUF_BEGV (buf); | |
| 1238 while (from > stop) | |
| 1239 { | |
| 460 | 1240 int comstyle = 0; /* mask for finding matching comment style */ |
| 428 | 1241 |
| 1242 from--; | |
| 1243 if (char_quoted (buf, from)) | |
| 1244 { | |
| 1245 from--; | |
| 1246 continue; | |
| 1247 } | |
| 1248 | |
| 1249 c = BUF_FETCH_CHAR (buf, from); | |
| 826 | 1250 syncode = SYNTAX_CODE_FROM_CACHE (scache, c); |
| 1251 code = SYNTAX_FROM_CODE (syncode); | |
| 428 | 1252 |
| 1253 if (code == Sendcomment) | |
| 1254 { | |
| 1255 /* we have found a single char end comment. we must record | |
| 1256 the comment style encountered so that later, we can match | |
| 1257 only the proper comment begin sequence of the same style */ | |
| 460 | 1258 comstyle = SYNTAX_CODE_COMMENT_1CHAR_MASK (syncode) |
| 1259 == SYNTAX_COMMENT_STYLE_A ? 0 : 1; | |
| 1260 } | |
| 1261 | |
| 1262 else if (code == Scomment_fence) | |
| 1263 { | |
| 1264 code = Sendcomment; | |
| 1265 comstyle = ST_COMMENT_STYLE; | |
| 428 | 1266 } |
| 1267 | |
| 1268 else if (from > stop | |
| 460 | 1269 && SYNTAX_CODE_END_SECOND_P (syncode)) |
| 428 | 1270 { |
| 460 | 1271 int prev_syncode; |
| 826 | 1272 UPDATE_SYNTAX_CACHE_BACKWARD (scache, from - 1); |
| 460 | 1273 prev_syncode = |
| 826 | 1274 SYNTAX_CODE_FROM_CACHE (scache, BUF_FETCH_CHAR (buf, from - 1)); |
| 460 | 1275 if (SYNTAX_CODES_END_P (prev_syncode, syncode)) |
| 1276 { | |
| 1277 /* We must record the comment style encountered so that | |
| 1278 later, we can match only the proper comment begin | |
| 1279 sequence of the same style. */ | |
| 1280 code = Sendcomment; | |
| 1281 comstyle = SYNTAX_CODES_COMMENT_MASK_END | |
| 1282 (prev_syncode, syncode) == SYNTAX_COMMENT_STYLE_A ? 0 : 1; | |
| 1283 from--; | |
| 1284 } | |
| 428 | 1285 } |
| 1286 | |
| 1287 if (code == Sendcomment) | |
| 1288 { | |
| 460 | 1289 from = find_start_of_comment (buf, from, stop, comstyle); |
| 428 | 1290 break; |
| 1291 } | |
| 1292 | |
| 1293 else if (code != Swhitespace | |
| 460 | 1294 && code != Scomment |
| 1295 && code != Sendcomment) | |
| 428 | 1296 { |
| 1297 BUF_SET_PT (buf, from + 1); | |
| 1298 return Qnil; | |
| 1299 } | |
| 1300 } | |
| 1301 | |
| 444 | 1302 n++; |
| 428 | 1303 } |
| 1304 | |
| 1305 BUF_SET_PT (buf, from); | |
| 1306 return Qt; | |
| 1307 } | |
| 1308 | |
| 1309 | |
| 1310 Lisp_Object | |
| 665 | 1311 scan_lists (struct buffer *buf, Charbpos from, int count, int depth, |
| 444 | 1312 int sexpflag, int noerror) |
| 428 | 1313 { |
| 665 | 1314 Charbpos stop; |
| 867 | 1315 Ichar c; |
| 428 | 1316 int quoted; |
| 1317 int mathexit = 0; | |
| 1318 enum syntaxcode code; | |
| 460 | 1319 int syncode; |
| 428 | 1320 int min_depth = depth; /* Err out if depth gets less than this. */ |
| 826 | 1321 struct syntax_cache *scache; |
|
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|
1322 Charbpos last_good = from; |
| 826 | 1323 |
| 428 | 1324 if (depth > 0) min_depth = 0; |
| 1325 | |
| 826 | 1326 scache = setup_buffer_syntax_cache (buf, from, count); |
| 428 | 1327 while (count > 0) |
| 1328 { | |
| 1329 QUIT; | |
| 1330 | |
| 1331 stop = BUF_ZV (buf); | |
| 1332 while (from < stop) | |
| 1333 { | |
| 460 | 1334 int comstyle = 0; /* mask for finding matching comment style */ |
| 428 | 1335 |
| 826 | 1336 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 428 | 1337 c = BUF_FETCH_CHAR (buf, from); |
| 826 | 1338 syncode = SYNTAX_CODE_FROM_CACHE (scache, c); |
| 1339 code = SYNTAX_FROM_CODE (syncode); | |
|
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diff
changeset
|
1340 if (depth == min_depth) |
|
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Ben Wing <ben@xemacs.org>
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diff
changeset
|
1341 last_good = from; |
| 428 | 1342 from++; |
| 1343 | |
| 1344 /* a 1-char comment start sequence */ | |
| 1345 if (code == Scomment && parse_sexp_ignore_comments) | |
| 1346 { | |
| 460 | 1347 comstyle = SYNTAX_CODE_COMMENT_1CHAR_MASK (syncode) == |
| 1348 SYNTAX_COMMENT_STYLE_A ? 0 : 1; | |
| 428 | 1349 } |
| 1350 | |
| 1351 /* else, a 2-char comment start sequence? */ | |
| 1352 else if (from < stop | |
| 460 | 1353 && SYNTAX_CODE_START_FIRST_P (syncode) |
| 428 | 1354 && parse_sexp_ignore_comments) |
| 1355 { | |
| 460 | 1356 int next_syncode; |
| 826 | 1357 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 460 | 1358 next_syncode = |
| 826 | 1359 SYNTAX_CODE_FROM_CACHE (scache, BUF_FETCH_CHAR (buf, from)); |
| 460 | 1360 |
| 1361 if (SYNTAX_CODES_START_P (syncode, next_syncode)) | |
| 1362 { | |
| 826 | 1363 /* we have encountered a comment start sequence and we |
| 1364 are ignoring all text inside comments. we must record | |
| 1365 the comment style this sequence begins so that later, | |
| 1366 only a comment end of the same style actually ends | |
| 1367 the comment section */ | |
| 1368 code = Scomment; | |
| 460 | 1369 comstyle = SYNTAX_CODES_COMMENT_MASK_START |
| 1370 (syncode, next_syncode) == SYNTAX_COMMENT_STYLE_A ? 0 : 1; | |
| 826 | 1371 from++; |
| 1372 } | |
| 428 | 1373 } |
| 826 | 1374 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 428 | 1375 |
| 460 | 1376 if (SYNTAX_CODE_PREFIX (syncode)) |
| 428 | 1377 continue; |
| 1378 | |
| 1379 switch (code) | |
| 1380 { | |
| 1381 case Sescape: | |
| 1382 case Scharquote: | |
| 1383 if (from == stop) goto lose; | |
| 1384 from++; | |
| 1385 /* treat following character as a word constituent */ | |
| 1386 case Sword: | |
| 1387 case Ssymbol: | |
| 1388 if (depth || !sexpflag) break; | |
| 1389 /* This word counts as a sexp; return at end of it. */ | |
| 1390 while (from < stop) | |
| 1391 { | |
| 826 | 1392 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 1393 switch (SYNTAX_FROM_CACHE (scache, BUF_FETCH_CHAR (buf, from))) | |
| 428 | 1394 { |
| 1395 case Scharquote: | |
| 1396 case Sescape: | |
| 1397 from++; | |
| 1398 if (from == stop) goto lose; | |
| 1399 break; | |
| 1400 case Sword: | |
| 1401 case Ssymbol: | |
| 1402 case Squote: | |
| 1403 break; | |
| 1404 default: | |
| 1405 goto done; | |
| 1406 } | |
| 1407 from++; | |
| 1408 } | |
| 1409 goto done; | |
| 1410 | |
| 460 | 1411 case Scomment_fence: |
| 1412 comstyle = ST_COMMENT_STYLE; | |
| 428 | 1413 case Scomment: |
| 1414 if (!parse_sexp_ignore_comments) | |
| 1415 break; | |
| 826 | 1416 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 428 | 1417 { |
| 665 | 1418 Charbpos newfrom = |
| 460 | 1419 find_end_of_comment (buf, from, stop, comstyle); |
| 428 | 1420 if (newfrom < 0) |
| 1421 { | |
| 1422 /* we stopped because from == stop in search forward */ | |
| 1423 from = stop; | |
| 1424 if (depth == 0) | |
| 1425 goto done; | |
| 1426 goto lose; | |
| 1427 } | |
| 1428 from = newfrom; | |
| 1429 } | |
| 1430 break; | |
| 1431 | |
| 1432 case Smath: | |
| 1433 if (!sexpflag) | |
| 1434 break; | |
| 1435 if (from != stop && c == BUF_FETCH_CHAR (buf, from)) | |
| 1436 from++; | |
| 1437 if (mathexit) | |
| 1438 { | |
| 1439 mathexit = 0; | |
| 1440 goto close1; | |
| 1441 } | |
| 1442 mathexit = 1; | |
| 1443 | |
| 1444 case Sopen: | |
| 1445 if (!++depth) goto done; | |
| 1446 break; | |
| 1447 | |
| 1448 case Sclose: | |
| 1449 close1: | |
| 1450 if (!--depth) goto done; | |
| 1451 if (depth < min_depth) | |
| 1452 { | |
| 444 | 1453 if (noerror) |
| 428 | 1454 return Qnil; |
|
4912
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use more specific `scan-error' in scan-lists to be GNU compatible
Ben Wing <ben@xemacs.org>
parents:
4759
diff
changeset
|
1455 signal_error_2 (Qscan_error, |
|
e99033b7e05c
use more specific `scan-error' in scan-lists to be GNU compatible
Ben Wing <ben@xemacs.org>
parents:
4759
diff
changeset
|
1456 "Containing expression ends prematurely", |
|
e99033b7e05c
use more specific `scan-error' in scan-lists to be GNU compatible
Ben Wing <ben@xemacs.org>
parents:
4759
diff
changeset
|
1457 make_int (last_good), make_int (from)); |
| 428 | 1458 } |
| 1459 break; | |
| 1460 | |
| 460 | 1461 case Sstring_fence: |
| 428 | 1462 case Sstring: |
| 1463 { | |
| 867 | 1464 Ichar stringterm; |
| 460 | 1465 |
| 1466 if (code != Sstring_fence) | |
| 1467 { | |
| 826 | 1468 /* XEmacs change: call syntax_match on character */ |
| 867 | 1469 Ichar ch = BUF_FETCH_CHAR (buf, from - 1); |
| 460 | 1470 Lisp_Object stermobj = |
| 1296 | 1471 syntax_match (scache->syntax_table, ch); |
| 428 | 1472 |
| 1473 if (CHARP (stermobj)) | |
| 1474 stringterm = XCHAR (stermobj); | |
| 1475 else | |
| 1476 stringterm = ch; | |
| 460 | 1477 } |
| 1478 else | |
| 1479 stringterm = '\0'; /* avoid compiler warnings */ | |
| 428 | 1480 |
| 1481 while (1) | |
| 1482 { | |
| 1483 if (from >= stop) | |
| 1484 goto lose; | |
| 826 | 1485 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 460 | 1486 c = BUF_FETCH_CHAR (buf, from); |
| 1487 if (code == Sstring | |
| 1488 ? c == stringterm | |
| 826 | 1489 : SYNTAX_FROM_CACHE (scache, c) == Sstring_fence) |
| 428 | 1490 break; |
| 460 | 1491 |
| 826 | 1492 switch (SYNTAX_FROM_CACHE (scache, c)) |
| 428 | 1493 { |
| 1494 case Scharquote: | |
| 1495 case Sescape: | |
| 1496 from++; | |
| 1497 break; | |
| 1498 default: | |
| 1499 break; | |
| 1500 } | |
| 1501 from++; | |
| 1502 } | |
| 1503 from++; | |
| 1504 if (!depth && sexpflag) goto done; | |
| 1505 break; | |
| 1506 } | |
| 1507 | |
| 1508 default: | |
| 1509 break; | |
| 1510 } | |
| 1511 } | |
| 1512 | |
| 1513 /* Reached end of buffer. Error if within object, | |
| 1514 return nil if between */ | |
| 1515 if (depth) goto lose; | |
| 1516 | |
| 1517 return Qnil; | |
| 1518 | |
| 1519 /* End of object reached */ | |
| 1520 done: | |
| 1521 count--; | |
| 1522 } | |
| 1523 | |
| 1524 while (count < 0) | |
| 1525 { | |
| 1526 QUIT; | |
| 1527 | |
| 1528 stop = BUF_BEGV (buf); | |
| 1529 while (from > stop) | |
| 1530 { | |
| 460 | 1531 int comstyle = 0; /* mask for finding matching comment style */ |
| 428 | 1532 |
| 1533 from--; | |
| 826 | 1534 UPDATE_SYNTAX_CACHE_BACKWARD (scache, from); |
| 428 | 1535 quoted = char_quoted (buf, from); |
| 1536 if (quoted) | |
| 460 | 1537 { |
| 428 | 1538 from--; |
| 826 | 1539 UPDATE_SYNTAX_CACHE_BACKWARD (scache, from); |
| 460 | 1540 } |
| 428 | 1541 |
| 1542 c = BUF_FETCH_CHAR (buf, from); | |
| 826 | 1543 syncode = SYNTAX_CODE_FROM_CACHE (scache, c); |
| 1544 code = SYNTAX_FROM_CODE (syncode); | |
| 428 | 1545 |
| 1546 if (code == Sendcomment && parse_sexp_ignore_comments) | |
| 1547 { | |
| 1548 /* we have found a single char end comment. we must record | |
| 1549 the comment style encountered so that later, we can match | |
| 1550 only the proper comment begin sequence of the same style */ | |
| 460 | 1551 comstyle = SYNTAX_CODE_COMMENT_1CHAR_MASK (syncode) |
| 1552 == SYNTAX_COMMENT_STYLE_A ? 0 : 1; | |
| 428 | 1553 } |
| 1554 | |
| 1555 else if (from > stop | |
| 460 | 1556 && SYNTAX_CODE_END_SECOND_P (syncode) |
| 428 | 1557 && !char_quoted (buf, from - 1) |
| 1558 && parse_sexp_ignore_comments) | |
| 1559 { | |
| 460 | 1560 int prev_syncode; |
| 826 | 1561 UPDATE_SYNTAX_CACHE_BACKWARD (scache, from - 1); |
| 1562 prev_syncode = | |
| 1563 SYNTAX_CODE_FROM_CACHE (scache, BUF_FETCH_CHAR (buf, from - 1)); | |
| 460 | 1564 |
| 1565 if (SYNTAX_CODES_END_P (prev_syncode, syncode)) | |
| 1566 { | |
| 428 | 1567 /* we must record the comment style encountered so that |
| 1568 later, we can match only the proper comment begin | |
| 1569 sequence of the same style */ | |
| 1570 code = Sendcomment; | |
| 460 | 1571 comstyle = SYNTAX_CODES_COMMENT_MASK_END |
| 1572 (prev_syncode, syncode) == SYNTAX_COMMENT_STYLE_A ? 0 : 1; | |
| 428 | 1573 from--; |
| 1574 } | |
| 460 | 1575 } |
| 428 | 1576 |
| 460 | 1577 if (SYNTAX_CODE_PREFIX (syncode)) |
| 428 | 1578 continue; |
| 1579 | |
| 434 | 1580 switch (quoted ? Sword : code) |
| 428 | 1581 { |
| 1582 case Sword: | |
| 1583 case Ssymbol: | |
| 1584 if (depth || !sexpflag) break; | |
| 1585 /* This word counts as a sexp; count object finished after | |
| 1586 passing it. */ | |
| 1587 while (from > stop) | |
| 1588 { | |
| 826 | 1589 UPDATE_SYNTAX_CACHE_BACKWARD (scache, from); |
| 428 | 1590 quoted = char_quoted (buf, from - 1); |
| 1591 | |
| 1592 if (quoted) | |
| 1593 from--; | |
| 1594 if (! (quoted | |
| 1595 || (syncode = | |
| 826 | 1596 SYNTAX_FROM_CACHE (scache, BUF_FETCH_CHAR (buf, |
| 1597 from - 1))) | |
| 428 | 1598 == Sword |
| 1599 || syncode == Ssymbol | |
| 1600 || syncode == Squote)) | |
| 1601 goto done2; | |
| 1602 from--; | |
| 1603 } | |
| 1604 goto done2; | |
| 1605 | |
| 1606 case Smath: | |
| 1607 if (!sexpflag) | |
| 1608 break; | |
| 1609 if (from != stop && c == BUF_FETCH_CHAR (buf, from - 1)) | |
| 1610 from--; | |
| 1611 if (mathexit) | |
| 1612 { | |
| 1613 mathexit = 0; | |
| 1614 goto open2; | |
| 1615 } | |
| 1616 mathexit = 1; | |
| 1617 | |
| 1618 case Sclose: | |
| 1619 if (!++depth) goto done2; | |
| 1620 break; | |
| 1621 | |
| 1622 case Sopen: | |
| 1623 open2: | |
| 1624 if (!--depth) goto done2; | |
| 1625 if (depth < min_depth) | |
| 1626 { | |
| 444 | 1627 if (noerror) |
| 428 | 1628 return Qnil; |
|
4912
e99033b7e05c
use more specific `scan-error' in scan-lists to be GNU compatible
Ben Wing <ben@xemacs.org>
parents:
4759
diff
changeset
|
1629 signal_error_2 (Qscan_error, |
|
e99033b7e05c
use more specific `scan-error' in scan-lists to be GNU compatible
Ben Wing <ben@xemacs.org>
parents:
4759
diff
changeset
|
1630 "Containing expression ends prematurely", |
|
e99033b7e05c
use more specific `scan-error' in scan-lists to be GNU compatible
Ben Wing <ben@xemacs.org>
parents:
4759
diff
changeset
|
1631 make_int (last_good), make_int (from)); |
| 428 | 1632 } |
| 1633 break; | |
| 1634 | |
| 460 | 1635 case Scomment_fence: |
| 1636 comstyle = ST_COMMENT_STYLE; | |
| 428 | 1637 case Sendcomment: |
| 1638 if (parse_sexp_ignore_comments) | |
| 460 | 1639 from = find_start_of_comment (buf, from, stop, comstyle); |
| 428 | 1640 break; |
| 1641 | |
| 460 | 1642 case Sstring_fence: |
| 428 | 1643 case Sstring: |
| 1644 { | |
| 867 | 1645 Ichar stringterm; |
| 460 | 1646 |
| 1647 if (code != Sstring_fence) | |
| 1648 { | |
| 428 | 1649 /* XEmacs change: call syntax_match() on character */ |
| 867 | 1650 Ichar ch = BUF_FETCH_CHAR (buf, from); |
| 460 | 1651 Lisp_Object stermobj = |
| 1296 | 1652 syntax_match (scache->syntax_table, ch); |
| 428 | 1653 |
| 1654 if (CHARP (stermobj)) | |
| 1655 stringterm = XCHAR (stermobj); | |
| 1656 else | |
| 1657 stringterm = ch; | |
| 460 | 1658 } |
| 1659 else | |
| 1660 stringterm = '\0'; /* avoid compiler warnings */ | |
| 428 | 1661 |
| 1662 while (1) | |
| 1663 { | |
| 1664 if (from == stop) goto lose; | |
| 460 | 1665 |
| 826 | 1666 UPDATE_SYNTAX_CACHE_BACKWARD (scache, from - 1); |
| 460 | 1667 c = BUF_FETCH_CHAR (buf, from - 1); |
| 1668 | |
| 1669 if ((code == Sstring | |
| 1670 ? c == stringterm | |
| 826 | 1671 : SYNTAX_FROM_CACHE (scache, c) == Sstring_fence) |
| 460 | 1672 && !char_quoted (buf, from - 1)) |
| 1673 { | |
| 428 | 1674 break; |
| 460 | 1675 } |
| 1676 | |
| 428 | 1677 from--; |
| 1678 } | |
| 1679 from--; | |
| 1680 if (!depth && sexpflag) goto done2; | |
| 1681 break; | |
| 1682 } | |
| 1683 } | |
| 1684 } | |
| 1685 | |
| 1686 /* Reached start of buffer. Error if within object, | |
| 1687 return nil if between */ | |
| 1688 if (depth) goto lose; | |
| 1689 | |
| 1690 return Qnil; | |
| 1691 | |
| 1692 done2: | |
| 1693 count++; | |
| 1694 } | |
| 1695 | |
| 1696 | |
| 1697 return (make_int (from)); | |
| 1698 | |
| 1699 lose: | |
| 444 | 1700 if (!noerror) |
|
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1701 signal_error_2 (Qscan_error, "Unbalanced parentheses", |
|
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1702 make_int (last_good), make_int (from)); |
| 428 | 1703 return Qnil; |
| 1704 } | |
| 1705 | |
| 1706 int | |
| 665 | 1707 char_quoted (struct buffer *buf, Charbpos pos) |
| 428 | 1708 { |
| 1709 enum syntaxcode code; | |
| 665 | 1710 Charbpos beg = BUF_BEGV (buf); |
| 428 | 1711 int quoted = 0; |
| 665 | 1712 Charbpos startpos = pos; |
| 826 | 1713 struct syntax_cache *scache = buf->syntax_cache; |
| 460 | 1714 |
| 1715 while (pos > beg) | |
| 1716 { | |
| 826 | 1717 UPDATE_SYNTAX_CACHE_BACKWARD (scache, pos - 1); |
| 1718 code = SYNTAX_FROM_CACHE (scache, BUF_FETCH_CHAR (buf, pos - 1)); | |
| 428 | 1719 |
| 460 | 1720 if (code != Scharquote && code != Sescape) |
| 1721 break; | |
| 1722 pos--; | |
| 1723 quoted = !quoted; | |
| 1724 } | |
| 1725 | |
| 826 | 1726 UPDATE_SYNTAX_CACHE (scache, startpos); |
| 428 | 1727 return quoted; |
| 1728 } | |
| 1729 | |
| 1730 DEFUN ("scan-lists", Fscan_lists, 3, 5, 0, /* | |
|
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1731 Scan from position FROM across COUNT lists starting from nesting DEPTH. |
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1732 Returns the position thus found. |
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1733 Optional BUFFER defaults to the current buffer. |
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1734 If optional NOERROR is non-nil, scan-lists will return nil instead of |
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|
1735 signalling an error when attempting to cross a buffer boundary. |
| 428 | 1736 |
| 1737 If DEPTH is nonzero, paren depth begins counting from that value, | |
| 1738 only places where the depth in parentheses becomes zero | |
| 1739 are candidates for stopping; COUNT such places are counted. | |
| 1740 Thus, a positive value for DEPTH means go out levels. | |
| 1741 | |
| 1742 Comments are ignored if `parse-sexp-ignore-comments' is non-nil. | |
| 1743 | |
| 1744 If the beginning or end of (the accessible part of) the buffer is reached | |
| 1745 and the depth is wrong, an error is signaled. | |
| 1746 If the depth is right but the count is not used up, nil is returned. | |
| 1747 | |
| 1748 */ | |
| 444 | 1749 (from, count, depth, buffer, noerror)) |
| 428 | 1750 { |
| 1751 struct buffer *buf; | |
| 1752 | |
| 1753 CHECK_INT (from); | |
| 1754 CHECK_INT (count); | |
| 1755 CHECK_INT (depth); | |
| 1756 buf = decode_buffer (buffer, 0); | |
| 1757 | |
| 1758 return scan_lists (buf, XINT (from), XINT (count), XINT (depth), 0, | |
| 444 | 1759 !NILP (noerror)); |
| 428 | 1760 } |
| 1761 | |
| 1762 DEFUN ("scan-sexps", Fscan_sexps, 2, 4, 0, /* | |
|
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1763 Scan from position FROM by COUNT balanced expressions. |
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1764 Returns the position thus found. |
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1765 |
| 428 | 1766 If COUNT is negative, scan backwards. |
|
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1767 Optional BUFFER defaults to the current buffer. |
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1768 If optional NOERROR is non-nil, scan-sexps will return nil instead of |
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|
1769 signalling an error. |
| 428 | 1770 |
| 1771 Comments are ignored if `parse-sexp-ignore-comments' is non-nil. | |
| 1772 | |
| 1773 If the beginning or end of (the accessible part of) the buffer is reached | |
| 1774 in the middle of a parenthetical grouping, an error is signaled. | |
| 1775 If the beginning or end is reached between groupings | |
| 1776 but before count is used up, nil is returned. | |
| 1777 */ | |
| 444 | 1778 (from, count, buffer, noerror)) |
| 428 | 1779 { |
| 1780 struct buffer *buf = decode_buffer (buffer, 0); | |
| 1781 CHECK_INT (from); | |
| 1782 CHECK_INT (count); | |
| 1783 | |
| 444 | 1784 return scan_lists (buf, XINT (from), XINT (count), 0, 1, !NILP (noerror)); |
| 428 | 1785 } |
| 1786 | |
| 1787 DEFUN ("backward-prefix-chars", Fbackward_prefix_chars, 0, 1, 0, /* | |
|
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|
1788 Move point backward over any number of chars with quote or prefix syntax. |
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|
1789 Optional BUFFER defaults to the current buffer. |
| 428 | 1790 */ |
| 1791 (buffer)) | |
| 1792 { | |
| 1793 struct buffer *buf = decode_buffer (buffer, 0); | |
| 665 | 1794 Charbpos beg = BUF_BEGV (buf); |
| 1795 Charbpos pos = BUF_PT (buf); | |
| 867 | 1796 Ichar c = '\0'; /* initialize to avoid compiler warnings */ |
| 826 | 1797 struct syntax_cache *scache; |
| 1798 | |
| 1799 scache = setup_buffer_syntax_cache (buf, pos, -1); | |
| 428 | 1800 |
| 1801 while (pos > beg && !char_quoted (buf, pos - 1) | |
| 460 | 1802 /* Previous statement updates syntax table. */ |
| 826 | 1803 && (SYNTAX_FROM_CACHE (scache, c = BUF_FETCH_CHAR (buf, pos - 1)) == Squote |
| 1804 || SYNTAX_CODE_PREFIX (SYNTAX_CODE_FROM_CACHE (scache, c)))) | |
| 428 | 1805 pos--; |
| 1806 | |
| 1807 BUF_SET_PT (buf, pos); | |
| 1808 | |
| 1809 return Qnil; | |
| 1810 } | |
| 1811 | |
| 1812 /* Parse forward from FROM to END, | |
| 1813 assuming that FROM has state OLDSTATE (nil means FROM is start of function), | |
| 1814 and return a description of the state of the parse at END. | |
| 1815 If STOPBEFORE is nonzero, stop at the start of an atom. | |
| 1816 If COMMENTSTOP is nonzero, stop at the start of a comment. */ | |
| 1817 | |
| 1818 static void | |
| 1819 scan_sexps_forward (struct buffer *buf, struct lisp_parse_state *stateptr, | |
| 665 | 1820 Charbpos from, Charbpos end, |
| 428 | 1821 int targetdepth, int stopbefore, |
| 1822 Lisp_Object oldstate, | |
| 1823 int commentstop) | |
| 1824 { | |
| 1825 struct lisp_parse_state state; | |
| 1826 | |
| 1827 enum syntaxcode code; | |
| 1828 struct level { int last, prev; }; | |
| 1829 struct level levelstart[100]; | |
| 1830 struct level *curlevel = levelstart; | |
| 1831 struct level *endlevel = levelstart + 100; | |
| 1832 int depth; /* Paren depth of current scanning location. | |
| 1833 level - levelstart equals this except | |
| 1834 when the depth becomes negative. */ | |
| 1835 int mindepth; /* Lowest DEPTH value seen. */ | |
| 1836 int start_quoted = 0; /* Nonzero means starting after a char quote */ | |
| 460 | 1837 int boundary_stop = commentstop == -1; |
| 428 | 1838 Lisp_Object tem; |
| 826 | 1839 struct syntax_cache *scache; |
| 1840 | |
| 1841 scache = setup_buffer_syntax_cache (buf, from, 1); | |
| 428 | 1842 if (NILP (oldstate)) |
| 1843 { | |
| 1844 depth = 0; | |
| 1845 state.instring = -1; | |
| 1846 state.incomment = 0; | |
| 1847 state.comstyle = 0; /* comment style a by default */ | |
| 460 | 1848 state.comstr_start = -1; /* no comment/string seen. */ |
| 428 | 1849 } |
| 1850 else | |
| 1851 { | |
| 1852 tem = Fcar (oldstate); /* elt 0, depth */ | |
| 1853 if (!NILP (tem)) | |
| 1854 depth = XINT (tem); | |
| 1855 else | |
| 1856 depth = 0; | |
| 1857 | |
| 1858 oldstate = Fcdr (oldstate); | |
| 1859 oldstate = Fcdr (oldstate); | |
| 1860 oldstate = Fcdr (oldstate); | |
| 1861 tem = Fcar (oldstate); /* elt 3, instring */ | |
| 460 | 1862 state.instring = ( !NILP (tem) |
| 1863 ? ( INTP (tem) ? XINT (tem) : ST_STRING_STYLE) | |
| 1864 : -1); | |
| 428 | 1865 |
| 460 | 1866 oldstate = Fcdr (oldstate); |
| 1867 tem = Fcar (oldstate); /* elt 4, incomment */ | |
| 428 | 1868 state.incomment = !NILP (tem); |
| 1869 | |
| 1870 oldstate = Fcdr (oldstate); | |
| 1871 tem = Fcar (oldstate); /* elt 5, follows-quote */ | |
| 1872 start_quoted = !NILP (tem); | |
| 1873 | |
| 1874 /* if the eighth element of the list is nil, we are in comment style | |
| 3025 | 1875 a; if it is t, we are in comment style b; if it is `syntax-table', |
| 460 | 1876 we are in a generic comment */ |
| 428 | 1877 oldstate = Fcdr (oldstate); |
| 1878 oldstate = Fcdr (oldstate); | |
| 460 | 1879 tem = Fcar (oldstate); /* elt 7, comment style a/b/fence */ |
| 1880 state.comstyle = NILP (tem) ? 0 : ( EQ (tem, Qsyntax_table) | |
| 1881 ? ST_COMMENT_STYLE : 1 ); | |
| 1882 | |
| 1883 oldstate = Fcdr (oldstate); /* elt 8, start of last comment/string */ | |
| 1884 tem = Fcar (oldstate); | |
| 1885 state.comstr_start = NILP (tem) ? -1 : XINT (tem); | |
| 1886 | |
| 1887 /* elt 9, char numbers of starts-of-expression of levels | |
| 1888 (starting from outermost). */ | |
| 1889 oldstate = Fcdr (oldstate); | |
| 1890 tem = Fcar (oldstate); /* elt 9, intermediate data for | |
| 1891 continuation of parsing (subject | |
| 1892 to change). */ | |
| 1893 while (!NILP (tem)) /* >= second enclosing sexps. */ | |
| 1894 { | |
| 1895 curlevel->last = XINT (Fcar (tem)); | |
| 1896 if (++curlevel == endlevel) | |
| 826 | 1897 stack_overflow ("Nesting too deep for parser", |
| 1898 make_int (curlevel - levelstart)); | |
| 460 | 1899 curlevel->prev = -1; |
| 1900 curlevel->last = -1; | |
| 1901 tem = Fcdr (tem); | |
| 1902 } | |
| 428 | 1903 } |
| 1904 state.quoted = 0; | |
| 1905 mindepth = depth; | |
| 1906 | |
| 1907 curlevel->prev = -1; | |
| 1908 curlevel->last = -1; | |
| 1909 | |
| 1910 /* Enter the loop at a place appropriate for initial state. */ | |
| 1911 | |
| 1912 if (state.incomment) goto startincomment; | |
| 1913 if (state.instring >= 0) | |
| 1914 { | |
| 1915 if (start_quoted) goto startquotedinstring; | |
| 1916 goto startinstring; | |
| 1917 } | |
| 1918 if (start_quoted) goto startquoted; | |
| 1919 | |
| 1920 while (from < end) | |
| 1921 { | |
| 867 | 1922 Ichar c; |
| 460 | 1923 int syncode; |
| 1924 | |
| 428 | 1925 QUIT; |
| 1926 | |
| 826 | 1927 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 460 | 1928 c = BUF_FETCH_CHAR (buf, from); |
| 826 | 1929 syncode = SYNTAX_CODE_FROM_CACHE (scache, c); |
| 1930 code = SYNTAX_FROM_CODE (syncode); | |
| 428 | 1931 from++; |
| 1932 | |
| 1933 /* record the comment style we have entered so that only the | |
| 1934 comment-ender sequence (or single char) of the same style | |
| 1935 actually terminates the comment section. */ | |
| 460 | 1936 if (code == Scomment) |
| 1937 { | |
| 1938 state.comstyle = | |
| 1939 SYNTAX_CODE_COMMENT_1CHAR_MASK (syncode) | |
| 1940 == SYNTAX_COMMENT_STYLE_A ? 0 : 1; | |
| 1941 state.comstr_start = from - 1; | |
| 1942 } | |
| 1943 | |
| 1944 /* a generic comment delimiter? */ | |
| 1945 else if (code == Scomment_fence) | |
| 1946 { | |
| 1947 state.comstyle = ST_COMMENT_STYLE; | |
| 1948 state.comstr_start = from - 1; | |
| 1949 code = Scomment; | |
| 428 | 1950 } |
| 1951 | |
| 1952 else if (from < end && | |
| 460 | 1953 SYNTAX_CODE_START_FIRST_P (syncode)) |
| 428 | 1954 { |
| 460 | 1955 int next_syncode; |
| 826 | 1956 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 460 | 1957 next_syncode = |
| 826 | 1958 SYNTAX_CODE_FROM_CACHE (scache, BUF_FETCH_CHAR (buf, from)); |
| 460 | 1959 |
| 1960 if (SYNTAX_CODES_START_P (syncode, next_syncode)) | |
| 1961 { | |
| 428 | 1962 code = Scomment; |
| 460 | 1963 state.comstyle = SYNTAX_CODES_COMMENT_MASK_START |
| 1964 (syncode, next_syncode) == SYNTAX_COMMENT_STYLE_A ? 0 : 1; | |
| 1965 state.comstr_start = from - 1; | |
| 428 | 1966 from++; |
| 826 | 1967 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 460 | 1968 } |
| 428 | 1969 } |
| 1970 | |
| 460 | 1971 if (SYNTAX_CODE_PREFIX (syncode)) |
| 428 | 1972 continue; |
| 1973 switch (code) | |
| 1974 { | |
| 1975 case Sescape: | |
| 1976 case Scharquote: | |
| 1977 if (stopbefore) goto stop; /* this arg means stop at sexp start */ | |
| 1978 curlevel->last = from - 1; | |
| 1979 startquoted: | |
| 1980 if (from == end) goto endquoted; | |
| 1981 from++; | |
| 1982 goto symstarted; | |
| 1983 /* treat following character as a word constituent */ | |
| 1984 case Sword: | |
| 1985 case Ssymbol: | |
| 1986 if (stopbefore) goto stop; /* this arg means stop at sexp start */ | |
| 1987 curlevel->last = from - 1; | |
| 1988 symstarted: | |
| 1989 while (from < end) | |
| 1990 { | |
| 826 | 1991 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 1992 switch (SYNTAX_FROM_CACHE (scache, BUF_FETCH_CHAR (buf, from))) | |
| 428 | 1993 { |
| 1994 case Scharquote: | |
| 1995 case Sescape: | |
| 1996 from++; | |
| 1997 if (from == end) goto endquoted; | |
| 1998 break; | |
| 1999 case Sword: | |
| 2000 case Ssymbol: | |
| 2001 case Squote: | |
| 2002 break; | |
| 2003 default: | |
| 2004 goto symdone; | |
| 2005 } | |
| 2006 from++; | |
| 2007 } | |
| 2008 symdone: | |
| 2009 curlevel->prev = curlevel->last; | |
| 2010 break; | |
| 2011 | |
| 2012 case Scomment: | |
| 2013 state.incomment = 1; | |
| 460 | 2014 if (commentstop || boundary_stop) goto done; |
| 428 | 2015 startincomment: |
| 460 | 2016 if (commentstop == 1) |
| 428 | 2017 goto done; |
| 826 | 2018 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 428 | 2019 { |
| 826 | 2020 Charbpos newfrom = find_end_of_comment (buf, from, end, |
| 2021 state.comstyle); | |
| 428 | 2022 if (newfrom < 0) |
| 2023 { | |
| 2024 /* we terminated search because from == end */ | |
| 2025 from = end; | |
| 2026 goto done; | |
| 2027 } | |
| 2028 from = newfrom; | |
| 2029 } | |
| 2030 state.incomment = 0; | |
| 2031 state.comstyle = 0; /* reset the comment style */ | |
| 460 | 2032 if (boundary_stop) goto done; |
| 428 | 2033 break; |
| 2034 | |
| 2035 case Sopen: | |
| 2036 if (stopbefore) goto stop; /* this arg means stop at sexp start */ | |
| 2037 depth++; | |
| 2038 curlevel->last = from - 1; | |
| 2039 if (++curlevel == endlevel) | |
| 826 | 2040 stack_overflow ("Nesting too deep for parser", |
| 2041 make_int (curlevel - levelstart)); | |
| 428 | 2042 curlevel->prev = -1; |
| 2043 curlevel->last = -1; | |
| 2044 if (targetdepth == depth) goto done; | |
| 2045 break; | |
| 2046 | |
| 2047 case Sclose: | |
| 2048 depth--; | |
| 2049 if (depth < mindepth) | |
| 2050 mindepth = depth; | |
| 2051 if (curlevel != levelstart) | |
| 2052 curlevel--; | |
| 2053 curlevel->prev = curlevel->last; | |
| 2054 if (targetdepth == depth) goto done; | |
| 2055 break; | |
| 2056 | |
| 2057 case Sstring: | |
| 460 | 2058 case Sstring_fence: |
| 2059 state.comstr_start = from - 1; | |
| 428 | 2060 if (stopbefore) goto stop; /* this arg means stop at sexp start */ |
| 2061 curlevel->last = from - 1; | |
| 460 | 2062 if (code == Sstring_fence) |
| 428 | 2063 { |
| 460 | 2064 state.instring = ST_STRING_STYLE; |
| 2065 } | |
| 2066 else | |
| 2067 { | |
| 2068 /* XEmacs change: call syntax_match() on character */ | |
| 867 | 2069 Ichar ch = BUF_FETCH_CHAR (buf, from - 1); |
| 460 | 2070 Lisp_Object stermobj = |
| 1296 | 2071 syntax_match (scache->syntax_table, ch); |
| 428 | 2072 |
| 2073 if (CHARP (stermobj)) | |
| 2074 state.instring = XCHAR (stermobj); | |
| 2075 else | |
| 2076 state.instring = ch; | |
| 2077 } | |
| 460 | 2078 if (boundary_stop) goto done; |
| 428 | 2079 startinstring: |
| 2080 while (1) | |
| 2081 { | |
| 460 | 2082 enum syntaxcode temp_code; |
| 2083 | |
| 428 | 2084 if (from >= end) goto done; |
| 460 | 2085 |
| 826 | 2086 UPDATE_SYNTAX_CACHE_FORWARD (scache, from); |
| 460 | 2087 c = BUF_FETCH_CHAR (buf, from); |
| 826 | 2088 temp_code = SYNTAX_FROM_CACHE (scache, c); |
| 460 | 2089 |
| 2090 if ( | |
| 2091 state.instring != ST_STRING_STYLE && | |
| 2092 temp_code == Sstring && | |
| 2093 c == state.instring) break; | |
| 2094 | |
| 2095 switch (temp_code) | |
| 428 | 2096 { |
| 460 | 2097 case Sstring_fence: |
| 2098 if (state.instring == ST_STRING_STYLE) | |
| 2099 goto string_end; | |
| 2100 break; | |
| 428 | 2101 case Scharquote: |
| 2102 case Sescape: | |
| 2103 { | |
| 2104 from++; | |
| 2105 startquotedinstring: | |
| 2106 if (from >= end) goto endquoted; | |
| 2107 break; | |
| 2108 } | |
| 2109 default: | |
| 2110 break; | |
| 2111 } | |
| 2112 from++; | |
| 2113 } | |
| 460 | 2114 string_end: |
| 428 | 2115 state.instring = -1; |
| 2116 curlevel->prev = curlevel->last; | |
| 2117 from++; | |
| 460 | 2118 if (boundary_stop) goto done; |
| 428 | 2119 break; |
| 2120 | |
| 2121 case Smath: | |
| 2122 break; | |
| 2123 | |
| 2124 case Swhitespace: | |
| 2125 case Spunct: | |
| 2126 case Squote: | |
| 2127 case Sendcomment: | |
| 460 | 2128 case Scomment_fence: |
| 428 | 2129 case Sinherit: |
| 2130 case Smax: | |
| 2131 break; | |
| 2132 } | |
| 2133 } | |
| 2134 goto done; | |
| 2135 | |
| 2136 stop: /* Here if stopping before start of sexp. */ | |
| 2137 from--; /* We have just fetched the char that starts it; */ | |
| 2138 goto done; /* but return the position before it. */ | |
| 2139 | |
| 2140 endquoted: | |
| 2141 state.quoted = 1; | |
| 2142 done: | |
| 2143 state.depth = depth; | |
| 2144 state.mindepth = mindepth; | |
| 2145 state.thislevelstart = curlevel->prev; | |
| 2146 state.prevlevelstart | |
| 2147 = (curlevel == levelstart) ? -1 : (curlevel - 1)->last; | |
| 2148 state.location = from; | |
| 460 | 2149 state.levelstarts = Qnil; |
| 2150 while (--curlevel >= levelstart) | |
| 2151 state.levelstarts = Fcons (make_int (curlevel->last), | |
| 2152 state.levelstarts); | |
| 428 | 2153 |
| 2154 *stateptr = state; | |
| 2155 } | |
| 2156 | |
| 2157 DEFUN ("parse-partial-sexp", Fparse_partial_sexp, 2, 7, 0, /* | |
| 2158 Parse Lisp syntax starting at FROM until TO; return status of parse at TO. | |
| 2159 Parsing stops at TO or when certain criteria are met; | |
| 2160 point is set to where parsing stops. | |
| 444 | 2161 If fifth arg OLDSTATE is omitted or nil, |
| 428 | 2162 parsing assumes that FROM is the beginning of a function. |
| 460 | 2163 Value is a list of nine elements describing final state of parsing: |
| 428 | 2164 0. depth in parens. |
| 2165 1. character address of start of innermost containing list; nil if none. | |
| 2166 2. character address of start of last complete sexp terminated. | |
| 2167 3. non-nil if inside a string. | |
| 460 | 2168 (It is the character that will terminate the string, |
| 2169 or t if the string should be terminated by an explicit | |
| 2170 `syntax-table' property.) | |
| 428 | 2171 4. t if inside a comment. |
| 2172 5. t if following a quote character. | |
| 2173 6. the minimum paren-depth encountered during this scan. | |
| 460 | 2174 7. nil if in comment style a, or not in a comment; t if in comment style b; |
| 2175 `syntax-table' if given by an explicit `syntax-table' property. | |
| 2176 8. character address of start of last comment or string; nil if none. | |
| 2177 9. Intermediate data for continuation of parsing (subject to change). | |
| 428 | 2178 If third arg TARGETDEPTH is non-nil, parsing stops if the depth |
| 2179 in parentheses becomes equal to TARGETDEPTH. | |
| 2180 Fourth arg STOPBEFORE non-nil means stop when come to | |
| 2181 any character that starts a sexp. | |
| 460 | 2182 Fifth arg OLDSTATE is a nine-element list like what this function returns. |
| 428 | 2183 It is used to initialize the state of the parse. Its second and third |
| 2184 elements are ignored. | |
| 460 | 2185 Sixth arg COMMENTSTOP non-nil means stop at the start of a comment. If it |
| 2186 is `syntax-table', stop after the start of a comment or a string, or after | |
| 2187 the end of a comment or string. | |
| 826 | 2188 Seventh arg BUFFER specifies the buffer to do the parsing in, and defaults |
| 2189 to the current buffer. | |
| 428 | 2190 */ |
| 2191 (from, to, targetdepth, stopbefore, oldstate, commentstop, buffer)) | |
| 2192 { | |
| 2193 struct lisp_parse_state state; | |
| 2194 int target; | |
| 665 | 2195 Charbpos start, end; |
| 428 | 2196 struct buffer *buf = decode_buffer (buffer, 0); |
| 2197 Lisp_Object val; | |
| 2198 | |
| 2199 if (!NILP (targetdepth)) | |
| 2200 { | |
| 2201 CHECK_INT (targetdepth); | |
| 2202 target = XINT (targetdepth); | |
| 2203 } | |
| 2204 else | |
| 2205 target = -100000; /* We won't reach this depth */ | |
| 2206 | |
| 2207 get_buffer_range_char (buf, from, to, &start, &end, 0); | |
| 2208 scan_sexps_forward (buf, &state, start, end, | |
| 2209 target, !NILP (stopbefore), oldstate, | |
| 460 | 2210 (NILP (commentstop) |
| 2211 ? 0 : (EQ (commentstop, Qsyntax_table) ? -1 : 1))); | |
| 428 | 2212 BUF_SET_PT (buf, state.location); |
| 2213 | |
| 2214 /* reverse order */ | |
| 2215 val = Qnil; | |
| 460 | 2216 val = Fcons (state.levelstarts, val); |
| 2217 val = Fcons ((state.incomment || (state.instring >= 0)) | |
| 2218 ? make_int (state.comstr_start) : Qnil, val); | |
| 2219 val = Fcons (state.comstyle ? (state.comstyle == ST_COMMENT_STYLE | |
| 2220 ? Qsyntax_table : Qt) : Qnil, val); | |
| 428 | 2221 val = Fcons (make_int (state.mindepth), val); |
| 2222 val = Fcons (state.quoted ? Qt : Qnil, val); | |
| 2223 val = Fcons (state.incomment ? Qt : Qnil, val); | |
| 460 | 2224 val = Fcons (state.instring < 0 |
| 2225 ? Qnil | |
| 2226 : (state.instring == ST_STRING_STYLE | |
| 2227 ? Qt : make_int (state.instring)), val); | |
| 826 | 2228 val = Fcons (state.thislevelstart < 0 ? Qnil : |
| 2229 make_int (state.thislevelstart), val); | |
| 2230 val = Fcons (state.prevlevelstart < 0 ? Qnil : | |
| 2231 make_int (state.prevlevelstart), val); | |
| 428 | 2232 val = Fcons (make_int (state.depth), val); |
| 2233 | |
| 2234 return val; | |
| 2235 } | |
| 2236 | |
| 2237 | |
| 2238 /* Updating of the mirror syntax table. | |
| 2239 | |
| 1296 | 2240 Each syntax table has a corresponding mirror table in it. Whenever we |
| 2241 make a change to a syntax table, we set a dirty flag. When accessing a | |
| 2242 value from the mirror table and the table is dirty, we call | |
| 2243 update_syntax_table() to clean it up. | |
| 428 | 2244 |
| 2245 #### We really only need to map over the changed range. | |
| 2246 | |
| 2247 If we change the standard syntax table, we need to map over | |
| 2248 all tables because any of them could be inheriting from the | |
| 2249 standard syntax table. | |
| 2250 | |
| 2251 When `set-syntax-table' is called, we set the buffer's mirror | |
| 2252 syntax table as well. | |
| 2253 */ | |
| 2254 | |
| 826 | 2255 static int |
| 2286 | 2256 copy_to_mirrortab (struct chartab_range *range, Lisp_Object UNUSED (table), |
| 826 | 2257 Lisp_Object val, void *arg) |
| 428 | 2258 { |
| 5013 | 2259 Lisp_Object mirrortab = GET_LISP_FROM_VOID (arg); |
| 428 | 2260 |
| 2261 if (CONSP (val)) | |
| 2262 val = XCAR (val); | |
| 826 | 2263 if (SYNTAX_FROM_CODE (XINT (val)) != Sinherit) |
| 2264 put_char_table (mirrortab, range, val); | |
| 2265 return 0; | |
| 2266 } | |
| 2267 | |
| 2268 static int | |
| 2286 | 2269 copy_if_not_already_present (struct chartab_range *range, |
| 2270 Lisp_Object UNUSED (table), | |
| 826 | 2271 Lisp_Object val, void *arg) |
| 2272 { | |
| 5013 | 2273 Lisp_Object mirrortab = GET_LISP_FROM_VOID (arg); |
| 826 | 2274 if (CONSP (val)) |
| 2275 val = XCAR (val); | |
| 2276 if (SYNTAX_FROM_CODE (XINT (val)) != Sinherit) | |
| 2277 { | |
| 2278 Lisp_Object existing = | |
| 1296 | 2279 updating_mirror_get_range_char_table (range, mirrortab, |
| 2280 Vbogus_syntax_table_value); | |
| 826 | 2281 if (NILP (existing)) |
| 2282 /* nothing at all */ | |
| 1296 | 2283 put_char_table (mirrortab, range, val); |
| 2284 else if (!EQ (existing, Vbogus_syntax_table_value)) | |
| 826 | 2285 /* full */ |
| 2286 ; | |
| 2287 else | |
| 2288 { | |
| 2289 Freset_char_table (Vtemp_table_for_use_updating_syntax_tables); | |
| 2290 copy_char_table_range | |
| 1296 | 2291 (mirrortab, Vtemp_table_for_use_updating_syntax_tables, range); |
| 2292 put_char_table (mirrortab, range, val); | |
| 826 | 2293 copy_char_table_range |
| 1296 | 2294 (Vtemp_table_for_use_updating_syntax_tables, mirrortab, range); |
| 826 | 2295 } |
| 428 | 2296 } |
| 826 | 2297 |
| 428 | 2298 return 0; |
| 2299 } | |
| 2300 | |
| 2301 static void | |
| 826 | 2302 update_just_this_syntax_table (Lisp_Object table) |
| 428 | 2303 { |
| 2304 struct chartab_range range; | |
| 826 | 2305 Lisp_Object mirrortab = XCHAR_TABLE (table)->mirror_table; |
| 2306 | |
| 1296 | 2307 assert (!XCHAR_TABLE (table)->mirror_table_p); |
| 826 | 2308 range.type = CHARTAB_RANGE_ALL; |
| 2309 Freset_char_table (mirrortab); | |
| 1296 | 2310 |
| 826 | 2311 /* First, copy the tables values other than inherit into the mirror |
| 2312 table. Then, for tables other than the standard syntax table, map | |
| 2313 over the standard table, copying values into the mirror table only if | |
| 2314 entries don't already exist in that table. (The copying step requires | |
| 2315 another mapping.) | |
| 2316 */ | |
| 428 | 2317 |
| 5013 | 2318 map_char_table (table, &range, copy_to_mirrortab, STORE_LISP_IN_VOID (mirrortab)); |
| 826 | 2319 /* second clause catches bootstrapping problems when initializing the |
| 2320 standard syntax table */ | |
| 2321 if (!EQ (table, Vstandard_syntax_table) && !NILP (Vstandard_syntax_table)) | |
| 1296 | 2322 map_char_table (Vstandard_syntax_table, &range, |
| 5013 | 2323 copy_if_not_already_present, STORE_LISP_IN_VOID (mirrortab)); |
| 3152 | 2324 /* The resetting made the default be Qnil. Put it back to Sword. */ |
| 2325 set_char_table_default (mirrortab, make_int (Sword)); | |
| 1296 | 2326 XCHAR_TABLE (mirrortab)->dirty = 0; |
| 428 | 2327 } |
| 2328 | |
| 2329 /* Called from chartab.c when a change is made to a syntax table. | |
| 2330 If this is the standard syntax table, we need to recompute | |
|
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2331 *all* syntax tables. Otherwise we just recompute this one. */ |
| 428 | 2332 |
| 2333 void | |
| 826 | 2334 update_syntax_table (Lisp_Object table) |
| 428 | 2335 { |
| 1296 | 2336 Lisp_Object nonmirror = XCHAR_TABLE (table)->mirror_table; |
| 2337 assert (XCHAR_TABLE (table)->mirror_table_p); | |
| 2338 if (EQ (nonmirror, Vstandard_syntax_table)) | |
| 428 | 2339 { |
| 2340 Lisp_Object syntab; | |
| 2341 | |
| 2342 for (syntab = Vall_syntax_tables; !NILP (syntab); | |
| 2343 syntab = XCHAR_TABLE (syntab)->next_table) | |
| 826 | 2344 update_just_this_syntax_table (syntab); |
| 428 | 2345 } |
| 2346 else | |
| 1296 | 2347 update_just_this_syntax_table (nonmirror); |
| 428 | 2348 } |
| 2349 | |
| 2350 | |
| 2351 /************************************************************************/ | |
| 2352 /* initialization */ | |
| 2353 /************************************************************************/ | |
| 2354 | |
| 2355 void | |
| 2356 syms_of_syntax (void) | |
| 2357 { | |
| 3092 | 2358 #ifdef NEW_GC |
|
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2359 INIT_LISP_OBJECT (syntax_cache); |
| 3092 | 2360 #endif /* NEW_GC */ |
| 563 | 2361 DEFSYMBOL (Qsyntax_table_p); |
| 2362 DEFSYMBOL (Qsyntax_table); | |
| 428 | 2363 |
| 2364 DEFSUBR (Fsyntax_table_p); | |
| 2365 DEFSUBR (Fsyntax_table); | |
| 826 | 2366 #ifdef DEBUG_XEMACS |
| 2367 DEFSUBR (Fmirror_syntax_table); | |
| 2368 DEFSUBR (Fsyntax_cache_info); | |
| 2369 #endif /* DEBUG_XEMACS */ | |
| 428 | 2370 DEFSUBR (Fstandard_syntax_table); |
| 2371 DEFSUBR (Fcopy_syntax_table); | |
| 2372 DEFSUBR (Fset_syntax_table); | |
| 2373 DEFSUBR (Fsyntax_designator_chars); | |
| 2374 DEFSUBR (Fchar_syntax); | |
| 2375 DEFSUBR (Fmatching_paren); | |
| 2376 /* DEFSUBR (Fmodify_syntax_entry); now in Lisp. */ | |
| 2377 /* DEFSUBR (Fdescribe_syntax); now in Lisp. */ | |
| 2378 | |
| 2379 DEFSUBR (Fforward_word); | |
| 2380 | |
| 2381 DEFSUBR (Fforward_comment); | |
| 2382 DEFSUBR (Fscan_lists); | |
| 2383 DEFSUBR (Fscan_sexps); | |
| 2384 DEFSUBR (Fbackward_prefix_chars); | |
| 2385 DEFSUBR (Fparse_partial_sexp); | |
|
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2386 |
|
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2387 DEFERROR_STANDARD (Qscan_error, Qsyntax_error); |
| 428 | 2388 } |
| 2389 | |
| 2390 void | |
| 2391 vars_of_syntax (void) | |
| 2392 { | |
| 2393 DEFVAR_BOOL ("parse-sexp-ignore-comments", &parse_sexp_ignore_comments /* | |
|
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2394 If non-nil, `forward-sexp' etc. treat comments as whitespace. |
| 428 | 2395 */ ); |
| 434 | 2396 parse_sexp_ignore_comments = 0; |
| 428 | 2397 |
| 460 | 2398 DEFVAR_BOOL ("lookup-syntax-properties", &lookup_syntax_properties /* |
|
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2399 If non-nil, `forward-sexp' etc. respect the `syntax-table' text property. |
| 826 | 2400 This property can be placed on buffers or strings and can be used to explicitly |
| 2401 specify the syntax table to be used for looking up the syntax of the chars | |
| 2402 having this property, or to directly specify the syntax of the chars. | |
| 2403 | |
| 460 | 2404 The value of this property should be either a syntax table, or a cons |
| 2405 of the form (SYNTAXCODE . MATCHCHAR), SYNTAXCODE being the numeric | |
| 2406 syntax code, MATCHCHAR being nil or the character to match (which is | |
|
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|
2407 relevant only when the syntax code is of an open or close type). |
| 460 | 2408 */ ); |
| 2409 lookup_syntax_properties = 1; | |
| 2410 | |
| 428 | 2411 DEFVAR_BOOL ("words-include-escapes", &words_include_escapes /* |
|
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|
2412 If non-nil, `forward-word' etc. treat escape characters as parts of words. |
| 428 | 2413 */ ); |
| 434 | 2414 words_include_escapes = 0; |
| 428 | 2415 |
| 2416 no_quit_in_re_search = 0; | |
| 1296 | 2417 |
| 2418 Vbogus_syntax_table_value = make_float (0.0); | |
| 2419 staticpro (&Vbogus_syntax_table_value); | |
| 428 | 2420 } |
| 2421 | |
| 2422 static void | |
| 3540 | 2423 define_standard_syntax (const UExtbyte *p, enum syntaxcode syn) |
| 428 | 2424 { |
| 2425 for (; *p; p++) | |
| 2426 Fput_char_table (make_char (*p), make_int (syn), Vstandard_syntax_table); | |
| 2427 } | |
| 2428 | |
| 2429 void | |
| 2430 complex_vars_of_syntax (void) | |
| 2431 { | |
| 867 | 2432 Ichar i; |
| 3540 | 2433 const UExtbyte *p; /* Latin-1, not internal format. */ |
| 2434 | |
| 2435 #define SET_RANGE_SYNTAX(start, end, syntax) \ | |
| 2436 do { \ | |
| 2437 for (i = start; i <= end; i++) \ | |
| 2438 Fput_char_table(make_char(i), make_int(syntax), \ | |
| 2439 Vstandard_syntax_table); \ | |
| 2440 } while (0) | |
| 2441 | |
| 2442 /* Set this now, so first buffer creation can refer to it. | |
| 2443 | |
| 2444 Make it nil before calling copy-syntax-table so that copy-syntax-table | |
| 2445 will know not to try to copy from garbage */ | |
| 428 | 2446 Vstandard_syntax_table = Qnil; |
| 2447 Vstandard_syntax_table = Fcopy_syntax_table (Qnil); | |
| 2448 staticpro (&Vstandard_syntax_table); | |
| 2449 | |
| 826 | 2450 Vtemp_table_for_use_updating_syntax_tables = Fmake_char_table (Qgeneric); |
| 2451 staticpro (&Vtemp_table_for_use_updating_syntax_tables); | |
| 2452 | |
| 428 | 2453 Vsyntax_designator_chars_string = make_string_nocopy (syntax_code_spec, |
| 2454 Smax); | |
| 2455 staticpro (&Vsyntax_designator_chars_string); | |
| 2456 | |
| 3540 | 2457 /* Default character syntax is word. */ |
| 3152 | 2458 set_char_table_default (Vstandard_syntax_table, make_int (Sword)); |
| 428 | 2459 |
| 3540 | 2460 /* Control 0; treat as punctuation */ |
| 2461 SET_RANGE_SYNTAX(0, 32, Spunct); | |
| 428 | 2462 |
| 3544 | 2463 /* The whitespace--overwriting some of the above changes. |
| 2464 | |
| 2465 String literals are const char *s, not const unsigned char *s. */ | |
|
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2466 define_standard_syntax((const UExtbyte *)" \t\015\014\012", Swhitespace); |
| 3540 | 2467 |
| 2468 /* DEL plus Control 1 */ | |
| 2469 SET_RANGE_SYNTAX(127, 159, Spunct); | |
| 2470 | |
| 3544 | 2471 define_standard_syntax ((const UExtbyte *)"\"", Sstring); |
| 2472 define_standard_syntax ((const UExtbyte *)"\\", Sescape); | |
| 2473 define_standard_syntax ((const UExtbyte *)"_-+*/&|<>=", Ssymbol); | |
| 2474 define_standard_syntax ((const UExtbyte *)".,;:?!#@~^'`", Spunct); | |
| 428 | 2475 |
| 3544 | 2476 for (p = (const UExtbyte *)"()[]{}"; *p; p+=2) |
| 428 | 2477 { |
| 2478 Fput_char_table (make_char (p[0]), | |
| 2479 Fcons (make_int (Sopen), make_char (p[1])), | |
| 2480 Vstandard_syntax_table); | |
| 2481 Fput_char_table (make_char (p[1]), | |
| 2482 Fcons (make_int (Sclose), make_char (p[0])), | |
| 2483 Vstandard_syntax_table); | |
| 2484 } | |
| 3540 | 2485 |
| 2486 /* Latin 1 "symbols." This contrasts with the FSF, where they're word | |
| 2487 constituents. */ | |
| 2488 SET_RANGE_SYNTAX(0240, 0277, Ssymbol); | |
| 2489 | |
| 2490 /* The guillemets. These are not parentheses, in contrast to what the old | |
| 2491 code did. */ | |
| 3569 | 2492 define_standard_syntax((const UExtbyte *)"\253\273", Spunct); |
| 3540 | 2493 |
| 2494 /* The inverted exclamation mark, and the multiplication and division | |
| 2495 signs. */ | |
| 3544 | 2496 define_standard_syntax((const UExtbyte *)"\241\327\367", Spunct); |
| 3540 | 2497 |
| 2498 #undef SET_RANGE_SYNTAX | |
| 428 | 2499 } |