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