Source

xemacs-beta / src / abbrev.c

Full commit
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
/* Primitives for word-abbrev mode.
   Copyright (C) 1985, 1986, 1992, 1993 Free Software Foundation, Inc.
   Copyright (C) 2002 Ben Wing.

This file is part of XEmacs.

XEmacs is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.

XEmacs is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License
along with XEmacs; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

/* Synched up with: FSF 19.30.  Note that there are many more functions in
   FSF's abbrev.c.  These have been moved into Lisp in XEmacs. */

/* Authorship:

   FSF: Original version; a long time ago.
   JWZ or Mly: Mostly moved into Lisp; maybe 1992.
   Ben Wing: Some changes for Mule for 19.12.
   Hrvoje Niksic: Largely rewritten in June 1997.
*/

/* This file has been Mule-ized. */

#include <config.h>
#include "lisp.h"

#include "buffer.h"
#include "commands.h"
#include "insdel.h"
#include "syntax.h"
#include "window.h"

/* An abbrev table is an obarray.
   Each defined abbrev is represented by a symbol in that obarray
   whose print name is the abbreviation.
   The symbol's value is a string which is the expansion.
   If its function definition is non-nil, it is called
   after the expansion is done.
   The plist slot of the abbrev symbol is its usage count. */

/* The table of global abbrevs.  These are in effect
   in any buffer in which abbrev mode is turned on. */
Lisp_Object Vglobal_abbrev_table;

int abbrev_all_caps;

/* Non-nil => use this location as the start of abbrev to expand
 (rather than taking the word before point as the abbrev) */
Lisp_Object Vabbrev_start_location;

/* Buffer that Vabbrev_start_location applies to */
Lisp_Object Vabbrev_start_location_buffer;

/* The symbol representing the abbrev most recently expanded */
Lisp_Object Vlast_abbrev;

/* A string for the actual text of the abbrev most recently expanded.
   This has more info than Vlast_abbrev since case is significant.  */
Lisp_Object Vlast_abbrev_text;

/* Character address of start of last abbrev expanded */
Fixnum last_abbrev_location;

/* Hook to run before expanding any abbrev.  */
Lisp_Object Vpre_abbrev_expand_hook, Qpre_abbrev_expand_hook;

Lisp_Object Qsystem_type;

struct abbrev_match_mapper_closure
{
  struct buffer *buf;
  Lisp_Object chartab;
  Charbpos point;
  Charcount maxlen;
  Lisp_Symbol *found;
};

/* For use by abbrev_match(): Match SYMBOL's name against buffer text
   before point, case-insensitively.  When found, return non-zero, so
   that map_obarray terminates mapping.  */
static int
abbrev_match_mapper (Lisp_Object symbol, void *arg)
{
  struct abbrev_match_mapper_closure *closure =
    (struct abbrev_match_mapper_closure *)arg;
  Charcount abbrev_length;
  Lisp_Symbol *sym = XSYMBOL (symbol);
  Lisp_Object abbrev;

  /* symbol_value should be OK here, because abbrevs are not expected
     to contain any SYMBOL_MAGIC stuff.  */
  if (UNBOUNDP (symbol_value (sym)) || NILP (symbol_value (sym)))
    {
      /* The symbol value of nil means that abbrev got undefined. */
      return 0;
    }
  abbrev = symbol_name (sym);
  abbrev_length = string_char_length (abbrev);
  if (abbrev_length > closure->maxlen)
    {
      /* This abbrev is too large -- it wouldn't fit. */
      return 0;
    }
  /* If `bar' is an abbrev, and a user presses `fubar<SPC>', we don't
     normally want to expand it.  OTOH, if the abbrev begins with
     non-word syntax (e.g. `#if'), it is OK to abbreviate it anywhere.  */
  if (abbrev_length < closure->maxlen && abbrev_length > 0
      && (WORD_SYNTAX_P (closure->chartab, string_ichar (abbrev, 0)))
      && (WORD_SYNTAX_P (closure->chartab,
			 BUF_FETCH_CHAR (closure->buf,
					 closure->point -
					 (abbrev_length + 1)))))
    {
      return 0;
    }
  /* Match abbreviation string against buffer text.  */
  {
    Ibyte *ptr = XSTRING_DATA (abbrev);
    Charcount idx;

    for (idx = 0; idx < abbrev_length; idx++)
      {
	if (CANONCASE (closure->buf,
		      BUF_FETCH_CHAR (closure->buf,
				      closure->point - abbrev_length + idx))
	    != CANONCASE (closure->buf, itext_ichar (ptr)))
	  {
	    break;
	  }
	INC_IBYTEPTR (ptr);
      }
    if (idx == abbrev_length)
      {
	/* This is the one. */
	closure->found = sym;
	return 1;
      }
  }
  return 0;
}

/* Match the buffer text against names of symbols in obarray.  Returns
   the matching symbol, or 0 if not found.  */
static Lisp_Symbol *
abbrev_match (struct buffer *buf, Lisp_Object obarray)
{
  struct abbrev_match_mapper_closure closure;

  /* Precalculate some stuff, so mapper function needn't to it in each
     iteration.  */
  closure.buf = buf;
  closure.point = BUF_PT (buf);
  closure.maxlen = closure.point - BUF_BEGV (buf);
  closure.chartab = buf->mirror_syntax_table;
  closure.found = 0;

  map_obarray (obarray, abbrev_match_mapper, &closure);

  return closure.found;
}

/* Take the word before point (or Vabbrev_start_location, if non-nil),
   and look it up in OBARRAY, and return the symbol (or zero).  This
   used to be the default method of searching, with the obvious
   limitation that the abbrevs may consist only of word characters.
   It is an order of magnitude faster than the proper abbrev_match(),
   but then again, vi is an order of magnitude faster than Emacs.

   This speed difference should be unnoticeable, though.  I have tested
   the degenerated cases of thousands of abbrevs being defined, and
   abbrev_match() was still fast enough for normal operation.  */
static Lisp_Symbol *
abbrev_oblookup (struct buffer *buf, Lisp_Object obarray)
{
  Charbpos wordstart, wordend;
  Ibyte *word, *p;
  Charbpos idx;
  Lisp_Object lookup;

  CHECK_VECTOR (obarray);

  if (!NILP (Vabbrev_start_location))
    {
      wordstart = get_buffer_pos_char (buf, Vabbrev_start_location,
				       GB_COERCE_RANGE);
      Vabbrev_start_location = Qnil;
#if 0
      /* Previously, abbrev-prefix-mark crockishly inserted a dash to
	 indicate the abbrev start point.  It now uses an extent with
	 a begin glyph so there's no dash to remove.  */
      if (wordstart != BUF_ZV (buf)
 	  && BUF_FETCH_CHAR (buf, wordstart) == '-')
	{
	  buffer_delete_range (buf, wordstart, wordstart + 1, 0);
	}
#endif
      wordend = BUF_PT (buf);
    }
  else
    {
      Charbpos point = BUF_PT (buf);

      wordstart = scan_words (buf, point, -1);
      if (!wordstart)
	return 0;

      wordend = scan_words (buf, wordstart, 1);
      if (!wordend)
	return 0;
      if (wordend > BUF_ZV (buf))
	wordend = BUF_ZV (buf);
      if (wordend > point)
	wordend = point;
      /* Unlike the original function, we allow expansion only after
	 the abbrev, not preceded by a number of spaces.  This is
	 because of consistency with abbrev_match. */
      if (wordend < point)
	return 0;
    }

  if (wordend <= wordstart)
    return 0;

  p = word = alloca_ibytes (MAX_ICHAR_LEN * (wordend - wordstart));
  for (idx = wordstart; idx < wordend; idx++)
    {
      Ichar c = BUF_FETCH_CHAR (buf, idx);
      if (UPPERCASEP (buf, c))
	c = DOWNCASE (buf, c);
      p += set_itext_ichar (p, c);
    }
  lookup = oblookup (obarray, word, p - word);
  if (SYMBOLP (lookup) && !NILP (symbol_value (XSYMBOL (lookup))))
    return XSYMBOL (lookup);
  else
    return NULL;
}

/* Return non-zero if OBARRAY contains an interned symbol ` '. */
static int
obarray_has_blank_p (Lisp_Object obarray)
{
  return !ZEROP (oblookup (obarray, (Ibyte *)" ", 1));
}

/* Analyze case in the buffer substring, and report it.  */
static void
abbrev_count_case (struct buffer *buf, Charbpos pos, Charcount length,
		   int *lccount, int *uccount)
{
  *lccount = *uccount = 0;
  while (length--)
    {
      Ichar c = BUF_FETCH_CHAR (buf, pos);
      if (UPPERCASEP (buf, c))
	++*uccount;
      else if (LOWERCASEP (buf, c))
	++*lccount;
      ++pos;
    }
}

DEFUN ("expand-abbrev", Fexpand_abbrev, 0, 0, "", /*
Expand the abbrev before point, if any.
Effective when explicitly called even when `abbrev-mode' is nil.
Returns the abbrev symbol, if expansion took place.
If no abbrev matched, but `pre-abbrev-expand-hook' changed the buffer,
 returns t.
*/
       ())
{
  /* This function can GC */
  struct buffer *buf = current_buffer;
  int oldmodiff = BUF_MODIFF (buf);
  Lisp_Object pre_modiff_p;
  Charbpos point;			/* position of point */
  Charbpos abbrev_start;		/* position of abbreviation beginning */

  Lisp_Symbol *(*fun) (struct buffer *, Lisp_Object);

  Lisp_Symbol *abbrev_symbol;
  Lisp_Object expansion, count, hook;
  Charcount abbrev_length;
  int lccount, uccount;

  run_hook (Qpre_abbrev_expand_hook);
  /* If the hook changes the buffer, treat that as having "done an
     expansion".  */
  pre_modiff_p = (BUF_MODIFF (buf) != oldmodiff ? Qt : Qnil);

  abbrev_symbol = NULL;
  if (!BUFFERP (Vabbrev_start_location_buffer) ||
      XBUFFER (Vabbrev_start_location_buffer) != buf)
    Vabbrev_start_location = Qnil;
  /* We use the more general abbrev_match() if the obarray blank flag
     is not set, and Vabbrev_start_location is nil.  Otherwise, use
     abbrev_oblookup(). */
#define MATCHFUN(tbl) ((obarray_has_blank_p (tbl)		 \
			&& NILP (Vabbrev_start_location))	 \
		       ? abbrev_match : abbrev_oblookup)
  if (!NILP (buf->abbrev_table))
    {
      fun = MATCHFUN (buf->abbrev_table);
      abbrev_symbol = fun (buf, buf->abbrev_table);
    }
  if (!abbrev_symbol && !NILP (Vglobal_abbrev_table))
    {
      fun = MATCHFUN (Vglobal_abbrev_table);
      abbrev_symbol = fun (buf, Vglobal_abbrev_table);
    }
  if (!abbrev_symbol)
    return pre_modiff_p;

  /* NOTE: we hope that `pre-abbrev-expand-hook' didn't do something
     nasty, such as changed the buffer.  Here we protect against the
     buffer getting killed.  */
  if (! BUFFER_LIVE_P (buf))
    return Qnil;
  point = BUF_PT (buf);

  /* OK, we're out of the must-be-fast part.  An abbreviation matched.
     Now find the parameters, insert the expansion, and make it all
     look pretty.  */
  abbrev_length = string_char_length (symbol_name (abbrev_symbol));
  abbrev_start = point - abbrev_length;

  expansion = symbol_value (abbrev_symbol);
  CHECK_STRING (expansion);

  count = symbol_plist (abbrev_symbol); /* Gag */
  if (NILP (count))
    count = Qzero;
  else
    CHECK_NATNUM (count);
  symbol_plist (abbrev_symbol) = Fadd1 (count);

  /* Count the case in the original text. */
  abbrev_count_case (buf, abbrev_start, abbrev_length, &lccount, &uccount);

  /* Remember the last abbrev text, location, etc. */
  Vlast_abbrev = wrap_symbol (abbrev_symbol);
  Vlast_abbrev_text =
    make_string_from_buffer (buf, abbrev_start, abbrev_length);
  last_abbrev_location = abbrev_start;

  /* Add an undo boundary, in case we are doing this for a
     self-inserting command which has avoided making one so far.  */
  if (INTERACTIVE)
    Fundo_boundary ();

  /* Remove the abbrev */
  buffer_delete_range (buf, abbrev_start, point, 0);
  /* And insert the expansion. */
  buffer_insert_lisp_string (buf, expansion);
  point = BUF_PT (buf);

  /* Now fiddle with the case. */
  if (uccount && !lccount)
    {
      /* Abbrev was all caps */
      if (!abbrev_all_caps
	  && scan_words (buf, point, -1) > scan_words (buf, abbrev_start, 1))
	{
	  Fupcase_initials_region (make_int (abbrev_start), make_int (point),
				   wrap_buffer (buf));
	}
      else
	{
	  /* If expansion is one word, or if user says so, upcase it all. */
	  Fupcase_region (make_int (abbrev_start), make_int (point),
			  wrap_buffer (buf));
	}
    }
  else if (uccount)
    {
      /* Abbrev included some caps.  Cap first initial of expansion */
      Charbpos pos = abbrev_start;
      /* Find the initial.  */
      while (pos < point
	     && !WORD_SYNTAX_P (buf->mirror_syntax_table,
				BUF_FETCH_CHAR (buf, pos)))
	pos++;
      /* Change just that.  */
      Fupcase_initials_region (make_int (pos), make_int (pos + 1),
			       wrap_buffer (buf));
    }

  hook = symbol_function (abbrev_symbol);
  if (!NILP (hook) && !UNBOUNDP (hook))
    call0 (hook);

  return Vlast_abbrev;
}

static void
write_abbrev (Lisp_Object sym, Lisp_Object stream)
{
  Lisp_Object name, count, system_flag;
  /* This function can GC */
  struct buffer *buf = current_buffer;

  if (INTP (XSYMBOL (sym)->plist))
    {
      count = XSYMBOL (sym)->plist;
      system_flag = Qnil;
    }
  else
    {
      count = Fget (sym, Qcount, Qunbound);
      system_flag = Fget (sym, Qsystem_type, Qunbound);
    }

  if (NILP (XSYMBOL_VALUE (sym)) || ! NILP (system_flag))
    return;

  buffer_insert_ascstring (buf, "    (");
  name = Fsymbol_name (sym);
  Fprin1 (name, stream);
  buffer_insert_ascstring (buf, " ");
  Fprin1 (XSYMBOL_VALUE (sym), stream);
  buffer_insert_ascstring (buf, " ");
  Fprin1 (XSYMBOL (sym)->function, stream);
  buffer_insert_ascstring (buf, " ");
  Fprin1 (count, stream);
  buffer_insert_ascstring (buf, ")\n");
}

static void
describe_abbrev (Lisp_Object sym, Lisp_Object stream)
{
  Lisp_Object one, count, system_flag;
  /* This function can GC */
  struct buffer *buf = current_buffer;

  if (INTP (XSYMBOL (sym)->plist))
    {
      count = XSYMBOL (sym)->plist;
      system_flag = Qnil;
    }
  else
    {
      count = Fget (sym, Qcount, Qunbound);
      system_flag = Fget (sym, Qsystem_type, Qunbound);
    }

  if (NILP (XSYMBOL_VALUE (sym)))
    return;

  one = make_int (1);
  Fprin1 (Fsymbol_name (sym), stream);

  if (!NILP (system_flag))
    {
      buffer_insert_ascstring (buf, " (sys)");
      Findent_to (make_int (20), one, Qnil);
    }
  else
    Findent_to (make_int (15), one, Qnil);

  Fprin1 (count, stream);
  Findent_to (make_int (20), one, Qnil);
  Fprin1 (XSYMBOL_VALUE (sym), stream);
  if (!NILP (XSYMBOL (sym)->function))
    {
      Findent_to (make_int (45), one, Qnil);
      Fprin1 (XSYMBOL (sym)->function, stream);
    }
  buffer_insert_ascstring (buf, "\n");
}

static int
record_symbol (Lisp_Object sym, void *arg)
{
  Lisp_Object closure = * (Lisp_Object *) arg;
  XSETCDR (closure, Fcons (sym, XCDR (closure)));
  return 0; /* Never stop */
}

DEFUN ("insert-abbrev-table-description", Finsert_abbrev_table_description,
       1, 2, 0, /*
Insert before point a full description of abbrev table named NAME.
NAME is a symbol whose value is an abbrev table.
If optional 2nd arg READABLE is non-nil, a human-readable description
is inserted.  Otherwise the description is an expression,
a call to `define-abbrev-table', which would
define the abbrev table NAME exactly as it is currently defined.

Abbrevs marked as "system abbrevs" are normally omitted.  However, if
READABLE is non-nil, they are listed.  */
       (name, readable))
{
  Lisp_Object table;
  Lisp_Object symbols;
  Lisp_Object stream;
  /* This function can GC */
  struct buffer *buf = current_buffer;

  CHECK_SYMBOL (name);
  table = Fsymbol_value (name);
  CHECK_VECTOR (table);

  /* FIXME: what's the XEmacs equivalent? APA */
  /* XSETBUFFER (stream, current_buffer); */
  /* Does not seem to work: */
  /* Fset_buffer (stream); */
  stream = wrap_buffer (current_buffer);

  symbols = Fcons (Qnil, Qnil);
  /* Lisp_Object closure = Fcons (Qnil, Qnil); */
  /* struct gcpro gcpro1; */
  /* GCPRO1 (closure); */
  /* map_obarray (table, record_symbol, symbols); */
  map_obarray (table, record_symbol, &symbols);
  /* map_obarray (table, record_symbol, &closure); */
  symbols = XCDR (symbols);
  symbols = list_sort (symbols, check_string_lessp_nokey, Qnil, Qnil);

  if (!NILP (readable))
    {
      buffer_insert_ascstring (buf, "(");
      Fprin1 (name, stream);
      buffer_insert_ascstring (buf, ")\n\n");
      while (! NILP (symbols))
	{
	  describe_abbrev (XCAR (symbols), stream);
	  symbols = XCDR (symbols);
	}

      buffer_insert_ascstring (buf, "\n\n");
    }
  else
    {
      buffer_insert_ascstring (buf, "(define-abbrev-table '");
      Fprin1 (name, stream);
      buffer_insert_ascstring (buf, " '(\n");
      while (! NILP (symbols))
	{
	  write_abbrev (XCAR (symbols), stream);
	  symbols = XCDR (symbols);
	}
      buffer_insert_ascstring (buf, "    ))\n\n");
    }

  return Qnil;
}

void
syms_of_abbrev (void)
{
  DEFSYMBOL(Qsystem_type);
  Qsystem_type = intern ("system-type");
  DEFSYMBOL (Qpre_abbrev_expand_hook);
  DEFSUBR (Fexpand_abbrev);
  DEFSUBR (Finsert_abbrev_table_description);
}

void
vars_of_abbrev (void)
{
  DEFVAR_LISP ("global-abbrev-table", &Vglobal_abbrev_table /*
The abbrev table whose abbrevs affect all buffers.
Each buffer may also have a local abbrev table.
If it does, the local table overrides the global one
for any particular abbrev defined in both.
*/ );
  Vglobal_abbrev_table = Qnil;  /* setup by Lisp code */

  DEFVAR_LISP ("last-abbrev", &Vlast_abbrev /*
The abbrev-symbol of the last abbrev expanded.
See the function `abbrev-symbol'.
*/ );

  DEFVAR_LISP ("last-abbrev-text", &Vlast_abbrev_text /*
The exact text of the last abbrev expanded.
nil if the abbrev has already been unexpanded.
*/ );

  DEFVAR_INT ("last-abbrev-location", &last_abbrev_location /*
The location of the start of the last abbrev expanded.
*/ );

  Vlast_abbrev = Qnil;
  Vlast_abbrev_text = Qnil;
  last_abbrev_location = 0;

  DEFVAR_LISP ("abbrev-start-location", &Vabbrev_start_location /*
Buffer position for `expand-abbrev' to use as the start of the abbrev.
nil means use the word before point as the abbrev.
Calling `expand-abbrev' sets this to nil.
*/ );
  Vabbrev_start_location = Qnil;

  DEFVAR_LISP ("abbrev-start-location-buffer", &Vabbrev_start_location_buffer /*
Buffer that `abbrev-start-location' has been set for.
Trying to expand an abbrev in any other buffer clears `abbrev-start-location'.
*/ );
  Vabbrev_start_location_buffer = Qnil;

  DEFVAR_BOOL ("abbrev-all-caps", &abbrev_all_caps /*
*Non-nil means expand multi-word abbrevs all caps if abbrev was so.
*/ );
  abbrev_all_caps = 0;

  DEFVAR_LISP ("pre-abbrev-expand-hook", &Vpre_abbrev_expand_hook /*
Function or functions to be called before abbrev expansion is done.
This is the first thing that `expand-abbrev' does, and so this may change
the current abbrev table before abbrev lookup happens.
*/ );
  Vpre_abbrev_expand_hook = Qnil;
}