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comparison src/abbrev.c @ 0:376386a54a3c r19-14

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Import from CVS: tag r19-14
author cvs
date Mon, 13 Aug 2007 08:45:50 +0200
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1 /* Primitives for word-abbrev mode.
2 Copyright (C) 1985, 1986, 1992, 1993 Free Software Foundation, Inc.
3
4 This file is part of XEmacs.
5
6 XEmacs is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by the
8 Free Software Foundation; either version 2, or (at your option) any
9 later version.
10
11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with XEmacs; see the file COPYING. If not, write to
18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
20
21 /* Synched up with: FSF 19.30. Note that there are many more functions in
22 FSF's abbrev.c. These have been moved into Lisp in XEmacs. */
23
24 /* Authorship:
25
26 FSF: Original version; a long time ago.
27 JWZ or Mly: Mostly moved into Lisp; maybe 1992.
28 Ben Wing: Some changes for Mule for 19.12.
29 */
30
31 /* This file has been Mule-ized. */
32
33 #include <config.h>
34 #include "lisp.h"
35
36 #include "buffer.h"
37 #include "commands.h"
38 #include "insdel.h"
39 #include "syntax.h"
40 #include "window.h"
41
42 /* An abbrev table is an obarray.
43 Each defined abbrev is represented by a symbol in that obarray
44 whose print name is the abbreviation.
45 The symbol's value is a string which is the expansion.
46 If its function definition is non-nil, it is called
47 after the expansion is done.
48 The plist slot of the abbrev symbol is its usage count. */
49
50 /* The table of global abbrevs. These are in effect
51 in any buffer in which abbrev mode is turned on. */
52 Lisp_Object Vglobal_abbrev_table;
53
54 int abbrev_all_caps;
55
56 /* Non-nil => use this location as the start of abbrev to expand
57 (rather than taking the word before point as the abbrev) */
58 Lisp_Object Vabbrev_start_location;
59
60 /* Buffer that Vabbrev_start_location applies to */
61 Lisp_Object Vabbrev_start_location_buffer;
62
63 /* The symbol representing the abbrev most recently expanded */
64 Lisp_Object Vlast_abbrev;
65
66 /* A string for the actual text of the abbrev most recently expanded.
67 This has more info than Vlast_abbrev since case is significant. */
68 Lisp_Object Vlast_abbrev_text;
69
70 /* Character address of start of last abbrev expanded */
71 int last_abbrev_point;
72
73 /* Hook to run before expanding any abbrev. */
74 Lisp_Object Vpre_abbrev_expand_hook, Qpre_abbrev_expand_hook;
75
76
77 /* Expand the word before point, if it is an abbrev.
78 Returns Qt if an expansion is done. */
79
80 DEFUN ("expand-abbrev", Fexpand_abbrev, Sexpand_abbrev, 0, 0, "" /*
81 Expand the abbrev before point, if there is an abbrev there.
82 Effective when explicitly called even when `abbrev-mode' is nil.
83 Returns t if expansion took place.
84 */ )
85 ()
86 {
87 /* This function can GC */
88 REGISTER Bufbyte *buffer, *p;
89 REGISTER Bufpos wordstart, wordend, idx;
90 Charcount whitecnt;
91 Charcount uccount = 0, lccount = 0;
92 REGISTER Lisp_Object sym;
93 Lisp_Object expansion, hook, value;
94 struct buffer *buf = current_buffer;
95 Lisp_Object lbuf;
96 int oldmodiff = BUF_MODIFF (buf);
97
98 XSETBUFFER (lbuf, buf);
99 run_hook (Qpre_abbrev_expand_hook);
100 /* If the hook changes the buffer, treat that as having "done an
101 expansion". */
102 value = (BUF_MODIFF (buf) != oldmodiff ? Qt : Qnil);
103
104 wordstart = 0;
105 if (!BUFFERP (Vabbrev_start_location_buffer) ||
106 XBUFFER (Vabbrev_start_location_buffer) != buf)
107 Vabbrev_start_location = Qnil;
108 if (!NILP (Vabbrev_start_location))
109 {
110 wordstart = get_buffer_pos_char (buf, Vabbrev_start_location, GB_COERCE_RANGE);
111 Vabbrev_start_location = Qnil;
112 if (wordstart < BUF_BEGV (buf) || wordstart > BUF_ZV (buf))
113 wordstart = 0;
114 if (wordstart && wordstart != BUF_ZV (buf) &&
115 BUF_FETCH_CHAR (buf, wordstart) == '-')
116 buffer_delete_range (buf, wordstart, wordstart + 1, 0);
117 }
118 if (!wordstart)
119 wordstart = scan_words (buf, BUF_PT (buf), -1);
120
121 if (!wordstart)
122 return value;
123
124 wordend = scan_words (buf, wordstart, 1);
125 if (!wordend)
126 return value;
127
128 if (wordend > BUF_PT (buf))
129 wordend = BUF_PT (buf);
130 whitecnt = BUF_PT (buf) - wordend;
131 if (wordend <= wordstart)
132 return value;
133
134 p = buffer = (Bufbyte *) alloca (MAX_EMCHAR_LEN*(wordend - wordstart));
135
136 for (idx = wordstart; idx < wordend; idx++)
137 {
138 REGISTER Emchar c = BUF_FETCH_CHAR (buf, idx);
139 if (UPPERCASEP (buf, c))
140 c = DOWNCASE (buf, c), uccount++;
141 else if (! NOCASEP (buf, c))
142 lccount++;
143 p += set_charptr_emchar (p, c);
144 }
145
146 if (VECTORP (buf->abbrev_table))
147 sym = oblookup (buf->abbrev_table,
148 buffer,
149 p - buffer);
150 else
151 sym = Qzero;
152 if (INTP (sym) || NILP (XSYMBOL (sym)->value))
153 sym = oblookup (Vglobal_abbrev_table,
154 buffer,
155 p - buffer);
156 if (INTP (sym) || NILP (XSYMBOL (sym)->value))
157 return value;
158
159 if (INTERACTIVE && !EQ (minibuf_window, Fselected_window (Qnil)))
160 {
161 /* Add an undo boundary, in case we are doing this for
162 a self-inserting command which has avoided making one so far. */
163 BUF_SET_PT (buf, wordend);
164 Fundo_boundary ();
165 }
166 BUF_SET_PT (buf, wordstart);
167 Vlast_abbrev_text =
168 make_string_from_buffer (buf, wordstart, wordend - wordstart);
169 buffer_delete_range (buf, wordstart, wordend, 0);
170
171 /* Now sym is the abbrev symbol. */
172 Vlast_abbrev = sym;
173 last_abbrev_point = wordstart;
174
175 if (INTP (XSYMBOL (sym)->plist))
176 XSETINT (XSYMBOL (sym)->plist,
177 XINT (XSYMBOL (sym)->plist) + 1); /* Increment use count */
178
179 expansion = XSYMBOL (sym)->value;
180 buffer_insert_lisp_string (buf, expansion);
181 BUF_SET_PT (buf, BUF_PT (buf) + whitecnt);
182
183 if (uccount && !lccount)
184 {
185 /* Abbrev was all caps */
186 /* If expansion is multiple words, normally capitalize each word */
187 /* This used to be if (!... && ... >= ...) Fcapitalize; else Fupcase
188 but Megatest 68000 compiler can't handle that */
189 if (!abbrev_all_caps)
190 if (scan_words (buf, BUF_PT (buf), -1) >
191 scan_words (buf, wordstart, 1))
192 {
193 Fupcase_initials_region (make_int (wordstart),
194 make_int (BUF_PT (buf)),
195 lbuf);
196 goto caped;
197 }
198 /* If expansion is one word, or if user says so, upcase it all. */
199 Fupcase_region (make_int (wordstart), make_int (BUF_PT (buf)),
200 lbuf);
201 caped: ;
202 }
203 else if (uccount)
204 {
205 /* Abbrev included some caps. Cap first initial of expansion */
206 Bufpos pos = wordstart;
207
208 /* Find the initial. */
209 while (pos < BUF_PT (buf)
210 && !WORD_SYNTAX_P (buf->syntax_table, BUF_FETCH_CHAR (buf, pos)))
211 pos++;
212
213 /* Change just that. */
214 Fupcase_initials_region (make_int (pos), make_int (pos + 1), lbuf);
215 }
216
217 hook = XSYMBOL (sym)->function;
218 if (!NILP (hook) && !UNBOUNDP (hook))
219 call0 (hook);
220
221 return Qt;
222 }
223
224 void
225 syms_of_abbrev (void)
226 {
227 defsymbol (&Qpre_abbrev_expand_hook, "pre-abbrev-expand-hook");
228 defsubr (&Sexpand_abbrev);
229 }
230
231 void
232 vars_of_abbrev (void)
233 {
234 DEFVAR_LISP ("global-abbrev-table", &Vglobal_abbrev_table /*
235 The abbrev table whose abbrevs affect all buffers.
236 Each buffer may also have a local abbrev table.
237 If it does, the local table overrides the global one
238 for any particular abbrev defined in both.
239 */ );
240 Vglobal_abbrev_table = Qnil; /* setup by Lisp code */
241
242 DEFVAR_LISP ("last-abbrev", &Vlast_abbrev /*
243 The abbrev-symbol of the last abbrev expanded.
244 See the function `abbrev-symbol'.
245 */ );
246
247 DEFVAR_LISP ("last-abbrev-text", &Vlast_abbrev_text /*
248 The exact text of the last abbrev expanded.
249 nil if the abbrev has already been unexpanded.
250 */ );
251
252 DEFVAR_INT ("last-abbrev-location", &last_abbrev_point /*
253 The location of the start of the last abbrev expanded.
254 */ );
255
256 Vlast_abbrev = Qnil;
257 Vlast_abbrev_text = Qnil;
258 last_abbrev_point = 0;
259
260 DEFVAR_LISP ("abbrev-start-location", &Vabbrev_start_location /*
261 Buffer position for `expand-abbrev' to use as the start of the abbrev.
262 nil means use the word before point as the abbrev.
263 Calling `expand-abbrev' sets this to nil.
264 */ );
265 Vabbrev_start_location = Qnil;
266
267 DEFVAR_LISP ("abbrev-start-location-buffer", &Vabbrev_start_location_buffer /*
268 Buffer that `abbrev-start-location' has been set for.
269 Trying to expand an abbrev in any other buffer clears `abbrev-start-location'.
270 */ );
271 Vabbrev_start_location_buffer = Qnil;
272
273 DEFVAR_BOOL ("abbrev-all-caps", &abbrev_all_caps /*
274 *Set non-nil means expand multi-word abbrevs all caps if abbrev was so.
275 */ );
276 abbrev_all_caps = 0;
277
278 DEFVAR_LISP ("pre-abbrev-expand-hook", &Vpre_abbrev_expand_hook /*
279 Function or functions to be called before abbrev expansion is done.
280 This is the first thing that `expand-abbrev' does, and so this may change
281 the current abbrev table before abbrev lookup happens.
282 */ );
283 Vpre_abbrev_expand_hook = Qnil;
284 }