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428
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1 /* undo handling for XEmacs.
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2 Copyright (C) 1990, 1992, 1993, 1994 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 19.28. */
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22
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23 /* This file has been Mule-ized. */
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24
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25 #include <config.h>
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26 #include "lisp.h"
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27 #include "buffer.h"
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28 #include "extents.h"
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29
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30 /* Maintained in event-stream.c */
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31 extern Bufpos last_point_position;
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32 extern Lisp_Object last_point_position_buffer;
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33
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34 /* Extent code needs to know about undo because the behavior of insert()
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35 with regard to extents varies depending on whether we are inside
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36 an undo or not. */
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37 int inside_undo;
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38
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39 /* Last buffer for which undo information was recorded. */
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40 static Lisp_Object last_undo_buffer;
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41
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42 Lisp_Object Qinhibit_read_only;
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43
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44 /* The first time a command records something for undo.
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45 it also allocates the undo-boundary object
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46 which will be added to the list at the end of the command.
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47 This ensures we can't run out of space while trying to make
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48 an undo-boundary. */
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49 static Lisp_Object pending_boundary;
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50
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51 static void
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52 undo_boundary (struct buffer *b)
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53 {
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54 Lisp_Object tem = Fcar (b->undo_list);
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55 if (!NILP (tem))
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56 {
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57 /* One way or another, cons nil onto the front of the undo list. */
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58 if (CONSP (pending_boundary))
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59 {
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60 /* If we have preallocated the cons cell to use here,
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61 use that one. */
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62 XCDR (pending_boundary) = b->undo_list;
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63 b->undo_list = pending_boundary;
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64 pending_boundary = Qnil;
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65 }
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66 else
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67 b->undo_list = Fcons (Qnil, b->undo_list);
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68 }
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69 }
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70
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71
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72 static int
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73 undo_prelude (struct buffer *b, int hack_pending_boundary)
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74 {
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75 if (EQ (b->undo_list, Qt))
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76 return (0);
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77
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78 if (NILP (last_undo_buffer)
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79 || (BUFFER_BASE_BUFFER (b)
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80 != BUFFER_BASE_BUFFER (XBUFFER (last_undo_buffer))))
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81 {
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82 undo_boundary (b);
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83 XSETBUFFER (last_undo_buffer, b);
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84 }
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85
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86 /* Allocate a cons cell to be the undo boundary after this command. */
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87 if (hack_pending_boundary && NILP (pending_boundary))
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88 pending_boundary = Fcons (Qnil, Qnil);
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89
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90 if (BUF_MODIFF (b) <= BUF_SAVE_MODIFF (b))
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91 {
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92 /* Record that an unmodified buffer is about to be changed.
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93 Record the file modification date so that when undoing this
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94 entry we can tell whether it is obsolete because the file was
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95 saved again. */
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96 b->undo_list
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97 = Fcons (Fcons (Qt,
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98 Fcons (make_int ((b->modtime >> 16) & 0xffff),
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99 make_int (b->modtime & 0xffff))),
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100 b->undo_list);
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101 }
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102 return 1;
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103 }
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104
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105
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106
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107 static Lisp_Object
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108 restore_inside_undo (Lisp_Object val)
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109 {
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110 inside_undo = XINT (val);
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111 return val;
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112 }
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113
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114
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115 /* Record an insertion that just happened or is about to happen,
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116 for LENGTH characters at position BEG.
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117 (It is possible to record an insertion before or after the fact
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118 because we don't need to record the contents.) */
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119
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120 void
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121 record_insert (struct buffer *b, Bufpos beg, Charcount length)
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122 {
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123 if (!undo_prelude (b, 1))
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124 return;
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125
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126 /* If this is following another insertion and consecutive with it
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127 in the buffer, combine the two. */
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128 if (CONSP (b->undo_list))
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129 {
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130 Lisp_Object elt;
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131 elt = XCAR (b->undo_list);
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132 if (CONSP (elt)
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133 && INTP (XCAR (elt))
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134 && INTP (XCDR (elt))
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135 && XINT (XCDR (elt)) == beg)
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136 {
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137 XCDR (elt) = make_int (beg + length);
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138 return;
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139 }
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140 }
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141
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142 b->undo_list = Fcons (Fcons (make_int (beg),
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143 make_int (beg + length)),
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144 b->undo_list);
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145 }
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146
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147 /* Record that a deletion is about to take place,
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148 for LENGTH characters at location BEG. */
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149
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150 void
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151 record_delete (struct buffer *b, Bufpos beg, Charcount length)
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152 {
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153 /* This function can GC */
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154 Lisp_Object sbeg;
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155 int at_boundary;
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156
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157 if (!undo_prelude (b, 1))
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158 return;
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159
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160 at_boundary = (CONSP (b->undo_list)
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161 && NILP (XCAR (b->undo_list)));
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162
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163 if (BUF_PT (b) == beg + length)
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164 sbeg = make_int (-beg);
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165 else
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166 sbeg = make_int (beg);
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167
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168 /* If we are just after an undo boundary, and
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169 point wasn't at start of deleted range, record where it was. */
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170 if (at_boundary
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171 && BUFFERP (last_point_position_buffer)
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172 && b == XBUFFER (last_point_position_buffer)
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173 && last_point_position != XINT (sbeg))
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174 b->undo_list = Fcons (make_int (last_point_position), b->undo_list);
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175
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176 b->undo_list = Fcons (Fcons (make_string_from_buffer (b, beg,
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177 length),
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178 sbeg),
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179 b->undo_list);
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180 }
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181
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182 /* Record that a replacement is about to take place,
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183 for LENGTH characters at location BEG.
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184 The replacement does not change the number of characters. */
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185
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186 void
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187 record_change (struct buffer *b, Bufpos beg, Charcount length)
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188 {
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189 record_delete (b, beg, length);
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190 record_insert (b, beg, length);
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191 }
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192
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193 /* Record that an EXTENT is about to be attached or detached in its buffer.
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194 This works much like a deletion or insertion, except that there's no string.
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195 The tricky part is that the buffer we operate on comes from EXTENT.
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196 Most extent changes happen as a side effect of string insertion and
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197 deletion; this call is solely for Fdetach_extent() and Finsert_extent().
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198 */
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199 void
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200 record_extent (Lisp_Object extent, int attached)
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201 {
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202 Lisp_Object obj = Fextent_object (extent);
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203
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204 if (BUFFERP (obj))
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205 {
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206 Lisp_Object token;
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207 struct buffer *b = XBUFFER (obj);
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208 if (!undo_prelude (b, 1))
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209 return;
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210 if (attached)
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211 token = extent;
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212 else
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213 token = list3 (extent, Fextent_start_position (extent),
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214 Fextent_end_position (extent));
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215 b->undo_list = Fcons (token, b->undo_list);
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216 }
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217 else
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218 return;
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219 }
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220
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221 #if 0 /* FSFmacs */
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222 /* Record a change in property PROP (whose old value was VAL)
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223 for LENGTH characters starting at position BEG in BUFFER. */
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224
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225 record_property_change (Bufpos beg, Charcount length,
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226 Lisp_Object prop, Lisp_Object value,
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227 Lisp_Object buffer)
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228 {
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229 Lisp_Object lbeg, lend, entry;
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230 struct buffer *b = XBUFFER (buffer);
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231
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232 if (!undo_prelude (b, 1))
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233 return;
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234
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235 lbeg = make_int (beg);
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236 lend = make_int (beg + length);
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237 entry = Fcons (Qnil, Fcons (prop, Fcons (value, Fcons (lbeg, lend))));
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238 b->undo_list = Fcons (entry, b->undo_list);
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239 }
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240 #endif /* FSFmacs */
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241
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242
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243 DEFUN ("undo-boundary", Fundo_boundary, 0, 0, 0, /*
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244 Mark a boundary between units of undo.
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245 An undo command will stop at this point,
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246 but another undo command will undo to the previous boundary.
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247 */
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248 ())
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249 {
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250 if (EQ (current_buffer->undo_list, Qt))
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251 return Qnil;
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252 undo_boundary (current_buffer);
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253 return Qnil;
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254 }
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255
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256 /* At garbage collection time, make an undo list shorter at the end,
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257 returning the truncated list.
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258 MINSIZE and MAXSIZE are the limits on size allowed, as described below.
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259 In practice, these are the values of undo-threshold and
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260 undo-high-threshold. */
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261
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262 Lisp_Object
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263 truncate_undo_list (Lisp_Object list, int minsize, int maxsize)
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264 {
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265 Lisp_Object prev, next, last_boundary;
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266 int size_so_far = 0;
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267
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268 if (!(minsize > 0 || maxsize > 0))
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269 return list;
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270
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271 prev = Qnil;
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272 next = list;
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273 last_boundary = Qnil;
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274
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275 if (!CONSP (list))
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276 return (list);
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277
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278 /* Always preserve at least the most recent undo record.
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279 If the first element is an undo boundary, skip past it. */
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280 if (CONSP (next)
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281 && NILP (XCAR (next)))
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282 {
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283 /* Add in the space occupied by this element and its chain link. */
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440
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284 size_so_far += sizeof (Lisp_Cons);
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428
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285
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286 /* Advance to next element. */
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287 prev = next;
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288 next = XCDR (next);
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289 }
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290 while (CONSP (next)
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291 && !NILP (XCAR (next)))
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292 {
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293 Lisp_Object elt;
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294 elt = XCAR (next);
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295
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296 /* Add in the space occupied by this element and its chain link. */
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440
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297 size_so_far += sizeof (Lisp_Cons);
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428
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298 if (CONSP (elt))
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299 {
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440
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300 size_so_far += sizeof (Lisp_Cons);
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428
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301 if (STRINGP (XCAR (elt)))
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440
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302 size_so_far += (sizeof (Lisp_String) - 1
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428
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303 + XSTRING_LENGTH (XCAR (elt)));
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304 }
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305
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306 /* Advance to next element. */
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307 prev = next;
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308 next = XCDR (next);
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309 }
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310 if (CONSP (next))
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311 last_boundary = prev;
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312
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313 while (CONSP (next))
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314 {
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315 Lisp_Object elt;
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316 elt = XCAR (next);
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317
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318 /* When we get to a boundary, decide whether to truncate
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319 either before or after it. The lower threshold, MINSIZE,
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320 tells us to truncate after it. If its size pushes past
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321 the higher threshold MAXSIZE as well, we truncate before it. */
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322 if (NILP (elt))
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323 {
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324 if (size_so_far > maxsize && maxsize > 0)
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325 break;
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326 last_boundary = prev;
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327 if (size_so_far > minsize && minsize > 0)
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328 break;
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329 }
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330
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331 /* Add in the space occupied by this element and its chain link. */
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440
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332 size_so_far += sizeof (Lisp_Cons);
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428
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333 if (CONSP (elt))
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334 {
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440
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335 size_so_far += sizeof (Lisp_Cons);
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428
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336 if (STRINGP (XCAR (elt)))
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440
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337 size_so_far += (sizeof (Lisp_String) - 1
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428
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338 + XSTRING_LENGTH (XCAR (elt)));
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339 }
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340
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341 /* Advance to next element. */
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342 prev = next;
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343 next = XCDR (next);
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344 }
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345
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346 /* If we scanned the whole list, it is short enough; don't change it. */
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347 if (NILP (next))
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348 return list;
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349
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350 /* Truncate at the boundary where we decided to truncate. */
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351 if (!NILP (last_boundary))
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352 {
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353 XCDR (last_boundary) = Qnil;
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354 return list;
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355 }
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356 else
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357 return Qnil;
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358 }
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359
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360 DEFUN ("primitive-undo", Fprimitive_undo, 2, 2, 0, /*
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361 Undo COUNT records from the front of the list LIST.
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362 Return what remains of the list.
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363 */
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364 (count, list))
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365 {
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366 struct gcpro gcpro1, gcpro2;
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367 Lisp_Object next = Qnil;
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368 /* This function can GC */
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369 int arg;
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370 int speccount = specpdl_depth ();
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371
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372 record_unwind_protect (restore_inside_undo, make_int (inside_undo));
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373 inside_undo = 1;
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374
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375 #if 0 /* This is a good feature, but would make undo-start
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376 unable to do what is expected. */
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377 Lisp_Object tem;
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378
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379 /* If the head of the list is a boundary, it is the boundary
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380 preceding this command. Get rid of it and don't count it. */
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381 tem = Fcar (list);
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382 if (NILP (tem))
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383 list = Fcdr (list);
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384 #endif
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385
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386 CHECK_INT (count);
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387 arg = XINT (count);
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388 next = Qnil;
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389 GCPRO2 (next, list);
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390
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|
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391 /* Don't let read-only properties interfere with undo. */
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392 if (NILP (current_buffer->read_only))
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393 specbind (Qinhibit_read_only, Qt);
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394
|
|
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395 while (arg > 0)
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396 {
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|
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397 while (1)
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|
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398 {
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399 if (NILP (list))
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400 break;
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401 else if (!CONSP (list))
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402 goto rotten;
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403 next = XCAR (list);
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404 list = XCDR (list);
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405 /* Exit inner loop at undo boundary. */
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406 if (NILP (next))
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407 break;
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408 /* Handle an integer by setting point to that value. */
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|
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409 else if (INTP (next))
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|
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410 BUF_SET_PT (current_buffer,
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|
|
411 bufpos_clip_to_bounds (BUF_BEGV (current_buffer),
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|
|
412 XINT (next),
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|
|
413 BUF_ZV (current_buffer)));
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|
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414 else if (CONSP (next))
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|
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415 {
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|
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416 Lisp_Object car = XCAR (next);
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|
|
417 Lisp_Object cdr = XCDR (next);
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|
|
418
|
|
|
419 if (EQ (car, Qt))
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|
|
420 {
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|
|
421 /* Element (t high . low) records previous modtime. */
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|
|
422 Lisp_Object high, low;
|
|
|
423 int mod_time;
|
|
|
424 if (!CONSP (cdr)) goto rotten;
|
|
|
425 high = XCAR (cdr);
|
|
|
426 low = XCDR (cdr);
|
|
|
427 if (!INTP (high) || !INTP (low)) goto rotten;
|
|
|
428 mod_time = (XINT (high) << 16) + XINT (low);
|
|
|
429 /* If this records an obsolete save
|
|
|
430 (not matching the actual disk file)
|
|
|
431 then don't mark unmodified. */
|
|
|
432 if (mod_time != current_buffer->modtime)
|
|
|
433 break;
|
|
|
434 #ifdef CLASH_DETECTION
|
|
|
435 Funlock_buffer ();
|
|
|
436 #endif /* CLASH_DETECTION */
|
|
|
437 /* may GC under ENERGIZE: */
|
|
|
438 Fset_buffer_modified_p (Qnil, Qnil);
|
|
|
439 }
|
|
|
440 else if (EXTENTP (car))
|
|
|
441 {
|
|
|
442 /* Element (extent start end) means that EXTENT was
|
|
|
443 detached, and we need to reattach it. */
|
|
|
444 Lisp_Object extent_obj, start, end;
|
|
|
445
|
|
|
446 extent_obj = car;
|
|
|
447 start = Fcar (cdr);
|
|
|
448 end = Fcar (Fcdr (cdr));
|
|
|
449
|
|
|
450 if (!INTP (start) || !INTP (end))
|
|
|
451 goto rotten;
|
|
|
452 Fset_extent_endpoints (extent_obj, start, end,
|
|
|
453 Fcurrent_buffer ());
|
|
|
454 }
|
|
|
455 #if 0 /* FSFmacs */
|
|
|
456 else if (EQ (car, Qnil))
|
|
|
457 {
|
|
|
458 /* Element (nil prop val beg . end) is property change. */
|
|
|
459 Lisp_Object beg, end, prop, val;
|
|
|
460
|
|
|
461 prop = Fcar (cdr);
|
|
|
462 cdr = Fcdr (cdr);
|
|
|
463 val = Fcar (cdr);
|
|
|
464 cdr = Fcdr (cdr);
|
|
|
465 beg = Fcar (cdr);
|
|
|
466 end = Fcdr (cdr);
|
|
|
467
|
|
|
468 Fput_text_property (beg, end, prop, val, Qnil);
|
|
|
469 }
|
|
|
470 #endif /* FSFmacs */
|
|
|
471 else if (INTP (car) && INTP (cdr))
|
|
|
472 {
|
|
|
473 /* Element (BEG . END) means range was inserted. */
|
|
|
474
|
|
|
475 if (XINT (car) < BUF_BEGV (current_buffer)
|
|
|
476 || XINT (cdr) > BUF_ZV (current_buffer))
|
|
|
477 error ("Changes to be undone are outside visible portion of buffer");
|
|
|
478 /* Set point first thing, so that undoing this undo
|
|
|
479 does not send point back to where it is now. */
|
|
|
480 Fgoto_char (car, Qnil);
|
|
|
481 Fdelete_region (car, cdr, Qnil);
|
|
|
482 }
|
|
|
483 else if (STRINGP (car) && INTP (cdr))
|
|
|
484 {
|
|
|
485 /* Element (STRING . POS) means STRING was deleted. */
|
|
|
486 Lisp_Object membuf = car;
|
|
|
487 int pos = XINT (cdr);
|
|
|
488
|
|
|
489 if (pos < 0)
|
|
|
490 {
|
|
|
491 if (-pos < BUF_BEGV (current_buffer) || -pos > BUF_ZV (current_buffer))
|
|
|
492 error ("Changes to be undone are outside visible portion of buffer");
|
|
|
493 BUF_SET_PT (current_buffer, -pos);
|
|
|
494 Finsert (1, &membuf);
|
|
|
495 }
|
|
|
496 else
|
|
|
497 {
|
|
|
498 if (pos < BUF_BEGV (current_buffer) || pos > BUF_ZV (current_buffer))
|
|
|
499 error ("Changes to be undone are outside visible portion of buffer");
|
|
|
500 BUF_SET_PT (current_buffer, pos);
|
|
|
501
|
|
|
502 /* Insert before markers so that if the mark is
|
|
|
503 currently on the boundary of this deletion, it
|
|
|
504 ends up on the other side of the now-undeleted
|
|
|
505 text from point. Since undo doesn't even keep
|
|
|
506 track of the mark, this isn't really necessary,
|
|
|
507 but it may lead to better behavior in certain
|
|
|
508 situations.
|
|
|
509
|
|
|
510 I'm doubtful that this is safe; you could mess
|
|
|
511 up the process-output mark in shell buffers, so
|
|
|
512 until I hear a compelling reason for this change,
|
|
|
513 I'm leaving it out. -jwz
|
|
|
514 */
|
|
|
515 /* Finsert_before_markers (1, &membuf); */
|
|
|
516 Finsert (1, &membuf);
|
|
|
517 BUF_SET_PT (current_buffer, pos);
|
|
|
518 }
|
|
|
519 }
|
|
|
520 else
|
|
|
521 {
|
|
|
522 goto rotten;
|
|
|
523 }
|
|
|
524 }
|
|
|
525 else if (EXTENTP (next))
|
|
|
526 Fdetach_extent (next);
|
|
|
527 else
|
|
|
528 {
|
|
|
529 rotten:
|
|
|
530 signal_simple_continuable_error
|
|
|
531 ("Something rotten in the state of undo", next);
|
|
|
532 }
|
|
|
533 }
|
|
|
534 arg--;
|
|
|
535 }
|
|
|
536
|
|
|
537 UNGCPRO;
|
|
|
538 return unbind_to (speccount, list);
|
|
|
539 }
|
|
|
540
|
|
|
541 void
|
|
|
542 syms_of_undo (void)
|
|
|
543 {
|
|
|
544 DEFSUBR (Fprimitive_undo);
|
|
|
545 DEFSUBR (Fundo_boundary);
|
|
|
546 defsymbol (&Qinhibit_read_only, "inhibit-read-only");
|
|
|
547 }
|
|
|
548
|
|
|
549 void
|
|
|
550 reinit_vars_of_undo (void)
|
|
|
551 {
|
|
|
552 inside_undo = 0;
|
|
|
553 }
|
|
|
554
|
|
|
555 void
|
|
|
556 vars_of_undo (void)
|
|
|
557 {
|
|
|
558 reinit_vars_of_undo ();
|
|
|
559
|
|
|
560 pending_boundary = Qnil;
|
|
|
561 staticpro (&pending_boundary);
|
|
|
562 last_undo_buffer = Qnil;
|
|
|
563 staticpro (&last_undo_buffer);
|
|
|
564 }
|
