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428
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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 Hrvoje Niksic: Largely rewritten in June 1997.
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30 */
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31
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32 /* This file has been Mule-ized. */
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33
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34 #include <config.h>
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35 #include "lisp.h"
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36
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37 #include "buffer.h"
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38 #include "commands.h"
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39 #include "insdel.h"
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40 #include "syntax.h"
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41 #include "window.h"
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42
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43 /* An abbrev table is an obarray.
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44 Each defined abbrev is represented by a symbol in that obarray
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45 whose print name is the abbreviation.
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46 The symbol's value is a string which is the expansion.
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47 If its function definition is non-nil, it is called
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48 after the expansion is done.
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49 The plist slot of the abbrev symbol is its usage count. */
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50
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51 /* The table of global abbrevs. These are in effect
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52 in any buffer in which abbrev mode is turned on. */
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53 Lisp_Object Vglobal_abbrev_table;
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54
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55 int abbrev_all_caps;
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56
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57 /* Non-nil => use this location as the start of abbrev to expand
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58 (rather than taking the word before point as the abbrev) */
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59 Lisp_Object Vabbrev_start_location;
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60
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61 /* Buffer that Vabbrev_start_location applies to */
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62 Lisp_Object Vabbrev_start_location_buffer;
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63
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64 /* The symbol representing the abbrev most recently expanded */
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65 Lisp_Object Vlast_abbrev;
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66
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67 /* A string for the actual text of the abbrev most recently expanded.
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68 This has more info than Vlast_abbrev since case is significant. */
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69 Lisp_Object Vlast_abbrev_text;
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70
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71 /* Character address of start of last abbrev expanded */
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458
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72 Fixnum last_abbrev_location;
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428
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73
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74 /* Hook to run before expanding any abbrev. */
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75 Lisp_Object Vpre_abbrev_expand_hook, Qpre_abbrev_expand_hook;
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76
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77
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78 struct abbrev_match_mapper_closure {
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79 struct buffer *buf;
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440
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80 Lisp_Char_Table *chartab;
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428
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81 Charcount point, maxlen;
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440
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82 Lisp_Symbol *found;
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428
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83 };
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84
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85 /* For use by abbrev_match(): Match SYMBOL's name against buffer text
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86 before point, case-insensitively. When found, return non-zero, so
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87 that map_obarray terminates mapping. */
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88 static int
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89 abbrev_match_mapper (Lisp_Object symbol, void *arg)
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90 {
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91 struct abbrev_match_mapper_closure *closure =
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92 (struct abbrev_match_mapper_closure *)arg;
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93 Charcount abbrev_length;
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440
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94 Lisp_Symbol *sym = XSYMBOL (symbol);
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95 Lisp_String *abbrev;
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428
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96
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97 /* symbol_value should be OK here, because abbrevs are not expected
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98 to contain any SYMBOL_MAGIC stuff. */
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99 if (UNBOUNDP (symbol_value (sym)) || NILP (symbol_value (sym)))
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100 {
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101 /* The symbol value of nil means that abbrev got undefined. */
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102 return 0;
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103 }
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104 abbrev = symbol_name (sym);
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105 abbrev_length = string_char_length (abbrev);
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106 if (abbrev_length > closure->maxlen)
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107 {
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108 /* This abbrev is too large -- it wouldn't fit. */
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109 return 0;
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110 }
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111 /* If `bar' is an abbrev, and a user presses `fubar<SPC>', we don't
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112 normally want to expand it. OTOH, if the abbrev begins with
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113 non-word syntax (e.g. `#if'), it is OK to abbreviate it anywhere. */
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114 if (abbrev_length < closure->maxlen && abbrev_length > 0
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115 && (WORD_SYNTAX_P (closure->chartab, string_char (abbrev, 0)))
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116 && (WORD_SYNTAX_P (closure->chartab,
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117 BUF_FETCH_CHAR (closure->buf,
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118 closure->point - (abbrev_length + 1)))))
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119 {
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120 return 0;
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121 }
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122 /* Match abbreviation string against buffer text. */
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123 {
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124 Bufbyte *ptr = string_data (abbrev);
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125 Charcount idx;
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126
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127 for (idx = 0; idx < abbrev_length; idx++)
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128 {
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129 if (DOWNCASE (closure->buf,
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130 BUF_FETCH_CHAR (closure->buf,
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131 closure->point - abbrev_length + idx))
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132 != DOWNCASE (closure->buf, charptr_emchar (ptr)))
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133 {
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134 break;
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135 }
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136 INC_CHARPTR (ptr);
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137 }
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138 if (idx == abbrev_length)
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139 {
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140 /* This is the one. */
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141 closure->found = sym;
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142 return 1;
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143 }
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144 }
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145 return 0;
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146 }
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147
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148 /* Match the buffer text against names of symbols in obarray. Returns
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149 the matching symbol, or 0 if not found. */
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440
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150 static Lisp_Symbol *
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428
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151 abbrev_match (struct buffer *buf, Lisp_Object obarray)
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152 {
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153 struct abbrev_match_mapper_closure closure;
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154
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155 /* Precalculate some stuff, so mapper function needn't to it in each
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156 iteration. */
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157 closure.buf = buf;
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158 closure.point = BUF_PT (buf);
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159 closure.maxlen = closure.point - BUF_BEGV (buf);
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160 closure.chartab = XCHAR_TABLE (buf->mirror_syntax_table);
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161 closure.found = 0;
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162
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163 map_obarray (obarray, abbrev_match_mapper, &closure);
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164
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165 return closure.found;
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166 }
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167
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168 /* Take the word before point (or Vabbrev_start_location, if non-nil),
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169 and look it up in OBARRAY, and return the symbol (or zero). This
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170 used to be the default method of searching, with the obvious
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171 limitation that the abbrevs may consist only of word characters.
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172 It is an order of magnitude faster than the proper abbrev_match(),
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173 but then again, vi is an order of magnitude faster than Emacs.
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174
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175 This speed difference should be unnoticeable, though. I have tested
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176 the degenerated cases of thousands of abbrevs being defined, and
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177 abbrev_match() was still fast enough for normal operation. */
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440
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178 static Lisp_Symbol *
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428
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179 abbrev_oblookup (struct buffer *buf, Lisp_Object obarray)
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180 {
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181 Bufpos wordstart, wordend;
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182 Bufbyte *word, *p;
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183 Bytecount idx;
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184 Lisp_Object lookup;
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185
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186 CHECK_VECTOR (obarray);
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187
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188 if (!NILP (Vabbrev_start_location))
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189 {
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190 wordstart = get_buffer_pos_char (buf, Vabbrev_start_location,
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191 GB_COERCE_RANGE);
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192 Vabbrev_start_location = Qnil;
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193 #if 0
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194 /* Previously, abbrev-prefix-mark crockishly inserted a dash to
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195 indicate the abbrev start point. It now uses an extent with
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196 a begin glyph so there's no dash to remove. */
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197 if (wordstart != BUF_ZV (buf)
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198 && BUF_FETCH_CHAR (buf, wordstart) == '-')
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199 {
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200 buffer_delete_range (buf, wordstart, wordstart + 1, 0);
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201 }
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202 #endif
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203 wordend = BUF_PT (buf);
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204 }
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205 else
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206 {
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207 Bufpos point = BUF_PT (buf);
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208
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209 wordstart = scan_words (buf, point, -1);
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210 if (!wordstart)
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211 return 0;
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212
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213 wordend = scan_words (buf, wordstart, 1);
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214 if (!wordend)
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215 return 0;
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216 if (wordend > BUF_ZV (buf))
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217 wordend = BUF_ZV (buf);
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218 if (wordend > point)
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219 wordend = point;
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220 /* Unlike the original function, we allow expansion only after
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221 the abbrev, not preceded by a number of spaces. This is
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222 because of consistency with abbrev_match. */
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223 if (wordend < point)
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224 return 0;
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225 }
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226
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227 if (wordend <= wordstart)
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228 return 0;
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229
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230 p = word = (Bufbyte *) alloca (MAX_EMCHAR_LEN * (wordend - wordstart));
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231 for (idx = wordstart; idx < wordend; idx++)
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232 {
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233 Emchar c = BUF_FETCH_CHAR (buf, idx);
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234 if (UPPERCASEP (buf, c))
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235 c = DOWNCASE (buf, c);
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236 p += set_charptr_emchar (p, c);
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237 }
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238 lookup = oblookup (obarray, word, p - word);
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239 if (SYMBOLP (lookup) && !NILP (symbol_value (XSYMBOL (lookup))))
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240 return XSYMBOL (lookup);
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241 else
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242 return NULL;
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243 }
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244
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245 /* Return non-zero if OBARRAY contains an interned symbol ` '. */
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246 static int
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247 obarray_has_blank_p (Lisp_Object obarray)
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248 {
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249 return !ZEROP (oblookup (obarray, (Bufbyte *)" ", 1));
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250 }
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251
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252 /* Analyze case in the buffer substring, and report it. */
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253 static void
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254 abbrev_count_case (struct buffer *buf, Bufpos pos, Charcount length,
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255 int *lccount, int *uccount)
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256 {
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257 *lccount = *uccount = 0;
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258 while (length--)
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259 {
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260 Emchar c = BUF_FETCH_CHAR (buf, pos);
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261 if (UPPERCASEP (buf, c))
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262 ++*uccount;
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263 else if (LOWERCASEP (buf, c))
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264 ++*lccount;
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265 ++pos;
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266 }
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267 }
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268
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269 DEFUN ("expand-abbrev", Fexpand_abbrev, 0, 0, "", /*
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270 Expand the abbrev before point, if any.
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271 Effective when explicitly called even when `abbrev-mode' is nil.
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272 Returns the abbrev symbol, if expansion took place.
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273 If no abbrev matched, but `pre-abbrev-expand-hook' changed the buffer,
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274 returns t.
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275 */
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276 ())
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277 {
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278 /* This function can GC */
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279 struct buffer *buf = current_buffer;
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280 int oldmodiff = BUF_MODIFF (buf);
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281 Lisp_Object pre_modiff_p;
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282 Bufpos point; /* position of point */
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283 Bufpos abbrev_start; /* position of abbreviation beginning */
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284
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440
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285 Lisp_Symbol *(*fun) (struct buffer *, Lisp_Object);
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428
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286
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440
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287 Lisp_Symbol *abbrev_symbol;
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288 Lisp_String *abbrev_string;
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428
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289 Lisp_Object expansion, count, hook;
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290 Charcount abbrev_length;
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291 int lccount, uccount;
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292
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293 run_hook (Qpre_abbrev_expand_hook);
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294 /* If the hook changes the buffer, treat that as having "done an
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295 expansion". */
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296 pre_modiff_p = (BUF_MODIFF (buf) != oldmodiff ? Qt : Qnil);
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297
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298 abbrev_symbol = NULL;
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299 if (!BUFFERP (Vabbrev_start_location_buffer) ||
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300 XBUFFER (Vabbrev_start_location_buffer) != buf)
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301 Vabbrev_start_location = Qnil;
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302 /* We use the more general abbrev_match() if the obarray blank flag
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303 is not set, and Vabbrev_start_location is nil. Otherwise, use
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304 abbrev_oblookup(). */
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305 #define MATCHFUN(tbl) ((obarray_has_blank_p (tbl) \
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306 && NILP (Vabbrev_start_location)) \
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307 ? abbrev_match : abbrev_oblookup)
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308 if (!NILP (buf->abbrev_table))
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309 {
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310 fun = MATCHFUN (buf->abbrev_table);
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311 abbrev_symbol = fun (buf, buf->abbrev_table);
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312 }
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313 if (!abbrev_symbol && !NILP (Vglobal_abbrev_table))
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314 {
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315 fun = MATCHFUN (Vglobal_abbrev_table);
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316 abbrev_symbol = fun (buf, Vglobal_abbrev_table);
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317 }
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|
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318 if (!abbrev_symbol)
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319 return pre_modiff_p;
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320
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|
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321 /* NOTE: we hope that `pre-abbrev-expand-hook' didn't do something
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322 nasty, such as changed the buffer. Here we protect against the
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323 buffer getting killed. */
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|
|
324 if (! BUFFER_LIVE_P (buf))
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325 return Qnil;
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|
|
326 point = BUF_PT (buf);
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327
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|
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328 /* OK, we're out of the must-be-fast part. An abbreviation matched.
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329 Now find the parameters, insert the expansion, and make it all
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330 look pretty. */
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|
331 abbrev_string = symbol_name (abbrev_symbol);
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|
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332 abbrev_length = string_char_length (abbrev_string);
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333 abbrev_start = point - abbrev_length;
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334
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|
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335 expansion = symbol_value (abbrev_symbol);
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336 CHECK_STRING (expansion);
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337
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|
|
338 count = symbol_plist (abbrev_symbol); /* Gag */
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|
|
339 if (NILP (count))
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|
340 count = Qzero;
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|
|
341 else
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|
|
342 CHECK_NATNUM (count);
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|
|
343 symbol_plist (abbrev_symbol) = make_int (1 + XINT (count));
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|
|
344
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|
|
345 /* Count the case in the original text. */
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|
|
346 abbrev_count_case (buf, abbrev_start, abbrev_length, &lccount, &uccount);
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|
|
347
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|
|
348 /* Remember the last abbrev text, location, etc. */
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|
|
349 XSETSYMBOL (Vlast_abbrev, abbrev_symbol);
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|
|
350 Vlast_abbrev_text =
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|
|
351 make_string_from_buffer (buf, abbrev_start, abbrev_length);
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|
|
352 last_abbrev_location = abbrev_start;
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|
|
353
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|
|
354 /* Add an undo boundary, in case we are doing this for a
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|
|
355 self-inserting command which has avoided making one so far. */
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|
|
356 if (INTERACTIVE)
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|
|
357 Fundo_boundary ();
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|
|
358
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|
|
359 /* Remove the abbrev */
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|
|
360 buffer_delete_range (buf, abbrev_start, point, 0);
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|
|
361 /* And insert the expansion. */
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|
|
362 buffer_insert_lisp_string (buf, expansion);
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|
|
363 point = BUF_PT (buf);
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|
|
364
|
|
|
365 /* Now fiddle with the case. */
|
|
|
366 if (uccount && !lccount)
|
|
|
367 {
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|
|
368 /* Abbrev was all caps */
|
|
|
369 if (!abbrev_all_caps
|
|
|
370 && scan_words (buf, point, -1) > scan_words (buf, abbrev_start, 1))
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|
|
371 {
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|
|
372 Fupcase_initials_region (make_int (abbrev_start), make_int (point),
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|
|
373 make_buffer (buf));
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|
|
374 }
|
|
|
375 else
|
|
|
376 {
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|
|
377 /* If expansion is one word, or if user says so, upcase it all. */
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|
|
378 Fupcase_region (make_int (abbrev_start), make_int (point),
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|
|
379 make_buffer (buf));
|
|
|
380 }
|
|
|
381 }
|
|
|
382 else if (uccount)
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|
|
383 {
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|
|
384 /* Abbrev included some caps. Cap first initial of expansion */
|
|
|
385 Bufpos pos = abbrev_start;
|
|
|
386 /* Find the initial. */
|
|
|
387 while (pos < point
|
|
|
388 && !WORD_SYNTAX_P (XCHAR_TABLE (buf->mirror_syntax_table),
|
|
|
389 BUF_FETCH_CHAR (buf, pos)))
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|
|
390 pos++;
|
|
|
391 /* Change just that. */
|
|
|
392 Fupcase_initials_region (make_int (pos), make_int (pos + 1),
|
|
|
393 make_buffer (buf));
|
|
|
394 }
|
|
|
395
|
|
|
396 hook = symbol_function (abbrev_symbol);
|
|
|
397 if (!NILP (hook) && !UNBOUNDP (hook))
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398 call0 (hook);
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399
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400 return Vlast_abbrev;
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401 }
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402
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403
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404 void
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405 syms_of_abbrev (void)
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406 {
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563
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407 DEFSYMBOL (Qpre_abbrev_expand_hook);
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428
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408 DEFSUBR (Fexpand_abbrev);
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409 }
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410
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411 void
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412 vars_of_abbrev (void)
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413 {
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414 DEFVAR_LISP ("global-abbrev-table", &Vglobal_abbrev_table /*
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415 The abbrev table whose abbrevs affect all buffers.
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416 Each buffer may also have a local abbrev table.
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417 If it does, the local table overrides the global one
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418 for any particular abbrev defined in both.
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419 */ );
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420 Vglobal_abbrev_table = Qnil; /* setup by Lisp code */
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421
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422 DEFVAR_LISP ("last-abbrev", &Vlast_abbrev /*
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423 The abbrev-symbol of the last abbrev expanded.
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424 See the function `abbrev-symbol'.
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425 */ );
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426
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427 DEFVAR_LISP ("last-abbrev-text", &Vlast_abbrev_text /*
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428 The exact text of the last abbrev expanded.
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429 nil if the abbrev has already been unexpanded.
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430 */ );
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431
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432 DEFVAR_INT ("last-abbrev-location", &last_abbrev_location /*
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433 The location of the start of the last abbrev expanded.
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|
|
434 */ );
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435
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436 Vlast_abbrev = Qnil;
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437 Vlast_abbrev_text = Qnil;
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438 last_abbrev_location = 0;
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|
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439
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440 DEFVAR_LISP ("abbrev-start-location", &Vabbrev_start_location /*
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|
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441 Buffer position for `expand-abbrev' to use as the start of the abbrev.
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|
|
442 nil means use the word before point as the abbrev.
|
|
|
443 Calling `expand-abbrev' sets this to nil.
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|
|
444 */ );
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|
|
445 Vabbrev_start_location = Qnil;
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|
|
446
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|
|
447 DEFVAR_LISP ("abbrev-start-location-buffer", &Vabbrev_start_location_buffer /*
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|
|
448 Buffer that `abbrev-start-location' has been set for.
|
|
|
449 Trying to expand an abbrev in any other buffer clears `abbrev-start-location'.
|
|
|
450 */ );
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|
|
451 Vabbrev_start_location_buffer = Qnil;
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|
|
452
|
|
|
453 DEFVAR_BOOL ("abbrev-all-caps", &abbrev_all_caps /*
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|
|
454 *Non-nil means expand multi-word abbrevs all caps if abbrev was so.
|
|
|
455 */ );
|
|
|
456 abbrev_all_caps = 0;
|
|
|
457
|
|
|
458 DEFVAR_LISP ("pre-abbrev-expand-hook", &Vpre_abbrev_expand_hook /*
|
|
|
459 Function or functions to be called before abbrev expansion is done.
|
|
|
460 This is the first thing that `expand-abbrev' does, and so this may change
|
|
|
461 the current abbrev table before abbrev lookup happens.
|
|
|
462 */ );
|
|
|
463 Vpre_abbrev_expand_hook = Qnil;
|
|
|
464 }
|
