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428
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1 /* Markers: examining, setting and killing.
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2 Copyright (C) 1985, 1992, 1993, 1994, 1995 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. */
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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 /* Note that markers are currently kept in an unordered list.
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26 This means that marker operations may be inefficient if
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27 there are a bunch of markers in the buffer. This probably
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28 won't have a significant impact on redisplay (which uses
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29 markers), but if it does, it wouldn't be too hard to change
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30 to an ordered gap array. (Just copy the code from extents.c.)
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31 */
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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
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38 static Lisp_Object
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39 mark_marker (Lisp_Object obj)
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40 {
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41 struct Lisp_Marker *marker = XMARKER (obj);
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42 Lisp_Object buf;
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43 /* DO NOT mark through the marker's chain.
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44 The buffer's markers chain does not preserve markers from gc;
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45 Instead, markers are removed from the chain when they are freed
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46 by gc.
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47 */
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48 if (!marker->buffer)
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49 return (Qnil);
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50
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51 XSETBUFFER (buf, marker->buffer);
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52 return (buf);
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53 }
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54
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55 static void
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56 print_marker (Lisp_Object obj, Lisp_Object printcharfun, int escapeflag)
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57 {
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58 struct Lisp_Marker *marker = XMARKER (obj);
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59 char buf[200];
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60
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61 if (print_readably)
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62 error ("printing unreadable object #<marker 0x%lx>", (long) marker);
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63
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64 write_c_string (GETTEXT ("#<marker "), printcharfun);
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65 if (!marker->buffer)
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66 write_c_string (GETTEXT ("in no buffer"), printcharfun);
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67 else
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68 {
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69 sprintf (buf, "at %ld in ", (long) marker_position (obj));
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70 write_c_string (buf, printcharfun);
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71 print_internal (marker->buffer->name, printcharfun, 0);
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72 }
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73 sprintf (buf, " 0x%lx>", (long) marker);
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74 write_c_string (buf, printcharfun);
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75 }
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76
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77 static int
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78 marker_equal (Lisp_Object obj1, Lisp_Object obj2, int depth)
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79 {
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80 struct Lisp_Marker *marker1 = XMARKER (obj1);
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81 struct Lisp_Marker *marker2 = XMARKER (obj2);
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82
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83 return ((marker1->buffer == marker2->buffer) &&
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84 (marker1->memind == marker2->memind ||
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85 /* All markers pointing nowhere are equal */
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86 !marker1->buffer));
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87 }
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88
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89 static unsigned long
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90 marker_hash (Lisp_Object obj, int depth)
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91 {
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92 unsigned long hash = (unsigned long) XMARKER (obj)->buffer;
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93 if (hash)
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94 hash = HASH2 (hash, XMARKER (obj)->memind);
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95 return hash;
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96 }
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97
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98 static const struct lrecord_description marker_description[] = {
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99 { XD_LISP_OBJECT, offsetof(struct Lisp_Marker, next), 3 },
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100 { XD_END }
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101 };
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102
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103 DEFINE_BASIC_LRECORD_IMPLEMENTATION ("marker", marker,
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104 mark_marker, print_marker, 0,
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105 marker_equal, marker_hash, marker_description,
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106 struct Lisp_Marker);
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107
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108 /* Operations on markers. */
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109
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110 DEFUN ("marker-buffer", Fmarker_buffer, 1, 1, 0, /*
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111 Return the buffer that MARKER points into, or nil if none.
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112 Return nil if MARKER points into a dead buffer or doesn't point anywhere.
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113 */
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114 (marker))
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115 {
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116 struct buffer *buf;
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117 CHECK_MARKER (marker);
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118 /* Return marker's buffer only if it is not dead. */
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119 if ((buf = XMARKER (marker)->buffer) && BUFFER_LIVE_P (buf))
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120 {
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121 Lisp_Object buffer;
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122 XSETBUFFER (buffer, buf);
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123 return buffer;
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124 }
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125 return Qnil;
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126 }
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127
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128 DEFUN ("marker-position", Fmarker_position, 1, 1, 0, /*
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129 Return the position MARKER points at, as a character number.
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130 Return `nil' if marker doesn't point anywhere.
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131 */
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132 (marker))
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133 {
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134 CHECK_MARKER (marker);
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135 return XMARKER (marker)->buffer ? make_int (marker_position (marker)) : Qnil;
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136 }
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137
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138 #if 0 /* useful debugging function */
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139
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140 static void
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141 check_marker_circularities (struct buffer *buf)
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142 {
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143 struct Lisp_Marker *tortoise, *hare;
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144
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145 tortoise = BUF_MARKERS (buf);
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146 hare = tortoise;
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147
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148 if (!tortoise)
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149 return;
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150
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151 while (1)
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152 {
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153 assert (hare->buffer == buf);
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154 hare = hare->next;
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155 if (!hare)
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156 return;
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157 assert (hare->buffer == buf);
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158 hare = hare->next;
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159 if (!hare)
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160 return;
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161 tortoise = tortoise->next;
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162 assert (tortoise != hare);
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163 }
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164 }
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165
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166 #endif
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167
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168 static Lisp_Object
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169 set_marker_internal (Lisp_Object marker, Lisp_Object pos, Lisp_Object buffer,
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170 int restricted_p)
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171 {
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172 Bufpos charno;
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173 struct buffer *b;
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174 struct Lisp_Marker *m;
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175 int point_p;
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176
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177 CHECK_MARKER (marker);
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178
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179 point_p = POINT_MARKER_P (marker);
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180
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181 /* If position is nil or a marker that points nowhere,
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182 make this marker point nowhere. */
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183 if (NILP (pos) ||
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184 (MARKERP (pos) && !XMARKER (pos)->buffer))
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185 {
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186 if (point_p)
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187 signal_simple_error ("Can't make point-marker point nowhere",
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188 marker);
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189 if (XMARKER (marker)->buffer)
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190 unchain_marker (marker);
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191 return marker;
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192 }
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193
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194 CHECK_INT_COERCE_MARKER (pos);
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195 if (NILP (buffer))
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196 b = current_buffer;
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197 else
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198 {
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199 CHECK_BUFFER (buffer);
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200 b = XBUFFER (buffer);
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201 /* If buffer is dead, set marker to point nowhere. */
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202 if (!BUFFER_LIVE_P (XBUFFER (buffer)))
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203 {
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204 if (point_p)
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205 signal_simple_error
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206 ("Can't move point-marker in a killed buffer", marker);
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207 if (XMARKER (marker)->buffer)
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208 unchain_marker (marker);
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209 return marker;
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210 }
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211 }
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212
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213 charno = XINT (pos);
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214 m = XMARKER (marker);
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215
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216 if (restricted_p)
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217 {
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218 if (charno < BUF_BEGV (b)) charno = BUF_BEGV (b);
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219 if (charno > BUF_ZV (b)) charno = BUF_ZV (b);
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220 }
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221 else
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222 {
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223 if (charno < BUF_BEG (b)) charno = BUF_BEG (b);
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224 if (charno > BUF_Z (b)) charno = BUF_Z (b);
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225 }
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226
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227 if (point_p)
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228 {
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229 #ifndef moving_point_by_moving_its_marker_is_a_bug
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230 BUF_SET_PT (b, charno); /* this will move the marker */
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231 #else /* It's not a feature, so it must be a bug */
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232 signal_simple_error ("DEBUG: attempt to move point via point-marker",
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233 marker);
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234 #endif
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235 }
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236 else
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237 {
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238 m->memind = bufpos_to_memind (b, charno);
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239 }
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240
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241 if (m->buffer != b)
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242 {
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243 if (point_p)
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244 signal_simple_error ("Can't change buffer of point-marker", marker);
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245 if (m->buffer != 0)
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246 unchain_marker (marker);
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247 m->buffer = b;
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248 marker_next (m) = BUF_MARKERS (b);
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249 marker_prev (m) = 0;
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250 if (BUF_MARKERS (b))
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251 marker_prev (BUF_MARKERS (b)) = m;
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252 BUF_MARKERS (b) = m;
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253 }
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254
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255 return marker;
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256 }
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257
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258
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259 DEFUN ("set-marker", Fset_marker, 2, 3, 0, /*
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260 Position MARKER before character number NUMBER in BUFFER.
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261 BUFFER defaults to the current buffer.
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262 If NUMBER is nil, makes marker point nowhere.
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263 Then it no longer slows down editing in any buffer.
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264 If this marker was returned by (point-marker t), then changing its position
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265 moves point. You cannot change its buffer or make it point nowhere.
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266 Returns MARKER.
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267 */
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268 (marker, number, buffer))
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269 {
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270 return set_marker_internal (marker, number, buffer, 0);
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271 }
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272
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273
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274 /* This version of Fset_marker won't let the position
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275 be outside the visible part. */
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276 Lisp_Object
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277 set_marker_restricted (Lisp_Object marker, Lisp_Object pos, Lisp_Object buffer)
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278 {
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279 return set_marker_internal (marker, pos, buffer, 1);
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280 }
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281
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282
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283 /* This is called during garbage collection,
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284 so we must be careful to ignore and preserve mark bits,
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285 including those in chain fields of markers. */
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286
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287 void
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288 unchain_marker (Lisp_Object m)
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289 {
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290 struct Lisp_Marker *marker = XMARKER (m);
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291 struct buffer *b = marker->buffer;
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292
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293 if (b == 0)
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294 return;
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295
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296 #ifdef ERROR_CHECK_GC
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297 assert (BUFFER_LIVE_P (b));
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298 #endif
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299
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300 if (marker_next (marker))
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301 marker_prev (marker_next (marker)) = marker_prev (marker);
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302 if (marker_prev (marker))
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303 marker_next (marker_prev (marker)) = marker_next (marker);
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304 else
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305 BUF_MARKERS (b) = marker_next (marker);
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306
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307 #ifdef ERROR_CHECK_GC
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308 assert (marker != XMARKER (b->point_marker));
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309 #endif
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310
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311 marker->buffer = 0;
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312 }
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313
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314 Bytind
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315 bi_marker_position (Lisp_Object marker)
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316 {
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317 struct Lisp_Marker *m = XMARKER (marker);
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318 struct buffer *buf = m->buffer;
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319 Bytind pos;
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320
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321 if (!buf)
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322 error ("Marker does not point anywhere");
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323
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324 /* FSF claims that marker indices could end up denormalized, i.e.
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325 in the gap. This is way bogus if it ever happens, and means
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326 something fucked up elsewhere. Since I've overhauled all this
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327 shit, I don't think this can happen. In any case, the following
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328 macro has an assert() in it that will catch these denormalized
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329 positions. */
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330 pos = memind_to_bytind (buf, m->memind);
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331
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332 #ifdef ERROR_CHECK_BUFPOS
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333 if (pos < BI_BUF_BEG (buf) || pos > BI_BUF_Z (buf))
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334 abort ();
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335 #endif
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336
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337 return pos;
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338 }
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339
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340 Bufpos
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341 marker_position (Lisp_Object marker)
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342 {
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343 struct buffer *buf = XMARKER (marker)->buffer;
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344
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345 if (!buf)
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346 error ("Marker does not point anywhere");
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347
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348 return bytind_to_bufpos (buf, bi_marker_position (marker));
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349 }
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350
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351 void
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352 set_bi_marker_position (Lisp_Object marker, Bytind pos)
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353 {
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354 struct Lisp_Marker *m = XMARKER (marker);
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355 struct buffer *buf = m->buffer;
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356
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357 if (!buf)
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358 error ("Marker does not point anywhere");
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359
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360 #ifdef ERROR_CHECK_BUFPOS
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361 if (pos < BI_BUF_BEG (buf) || pos > BI_BUF_Z (buf))
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362 abort ();
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363 #endif
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364
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365 m->memind = bytind_to_memind (buf, pos);
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366 }
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367
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368 void
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369 set_marker_position (Lisp_Object marker, Bufpos pos)
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370 {
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371 struct buffer *buf = XMARKER (marker)->buffer;
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372
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373 if (!buf)
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374 error ("Marker does not point anywhere");
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375
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376 set_bi_marker_position (marker, bufpos_to_bytind (buf, pos));
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377 }
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378
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379 static Lisp_Object
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380 copy_marker_1 (Lisp_Object marker, Lisp_Object type, int noseeum)
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381 {
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382 REGISTER Lisp_Object new;
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383
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384 while (1)
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385 {
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386 if (INTP (marker) || MARKERP (marker))
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387 {
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388 if (noseeum)
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389 new = noseeum_make_marker ();
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390 else
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391 new = Fmake_marker ();
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392 Fset_marker (new, marker,
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393 (MARKERP (marker) ? Fmarker_buffer (marker) : Qnil));
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394 XMARKER (new)->insertion_type = !NILP (type);
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395 return new;
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396 }
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397 else
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398 marker = wrong_type_argument (Qinteger_or_marker_p, marker);
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|
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399 }
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400
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401 RETURN_NOT_REACHED (Qnil) /* not reached */
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402 }
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403
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404 DEFUN ("copy-marker", Fcopy_marker, 1, 2, 0, /*
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405 Return a new marker pointing at the same place as MARKER.
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|
|
406 If argument is a number, makes a new marker pointing
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|
|
407 at that position in the current buffer.
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|
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408 The optional argument TYPE specifies the insertion type of the new marker;
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|
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409 see `marker-insertion-type'.
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|
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410 */
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|
|
411 (marker, type))
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|
|
412 {
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|
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413 return copy_marker_1 (marker, type, 0);
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|
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414 }
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415
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|
|
416 Lisp_Object
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|
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417 noseeum_copy_marker (Lisp_Object marker, Lisp_Object type)
|
|
|
418 {
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|
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419 return copy_marker_1 (marker, type, 1);
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|
|
420 }
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421
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|
|
422 DEFUN ("marker-insertion-type", Fmarker_insertion_type, 1, 1, 0, /*
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|
|
423 Return insertion type of MARKER: t if it stays after inserted text.
|
|
|
424 nil means the marker stays before text inserted there.
|
|
|
425 */
|
|
|
426 (marker))
|
|
|
427 {
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|
|
428 CHECK_MARKER (marker);
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|
|
429 return XMARKER (marker)->insertion_type ? Qt : Qnil;
|
|
|
430 }
|
|
|
431
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432 DEFUN ("set-marker-insertion-type", Fset_marker_insertion_type, 2, 2, 0, /*
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433 Set the insertion-type of MARKER to TYPE.
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434 If TYPE is t, it means the marker advances when you insert text at it.
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435 If TYPE is nil, it means the marker stays behind when you insert text at it.
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436 */
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437 (marker, type))
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438 {
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439 CHECK_MARKER (marker);
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440
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441 XMARKER (marker)->insertion_type = ! NILP (type);
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442 return type;
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443 }
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444
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445 /* #### What is the possible use of this? It looks quite useless to
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446 me, because there is no way to find *which* markers are positioned
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447 at POSITION. Additional bogosity bonus: (buffer-has-markers-at
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448 (point)) will always return t because of the `point-marker'. The
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449 same goes for the position of mark. Bletch!
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450
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451 Someone should discuss this with Stallman, but I don't have the
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452 stomach. In fact, this function sucks so badly that I'm disabling
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453 it by default (although I've debugged it). If you want to use it,
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454 use extents instead. --hniksic */
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455 #if 0
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456 xxDEFUN ("buffer-has-markers-at", Fbuffer_has_markers_at, 1, 1, 0, /*
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457 Return t if there are markers pointing at POSITION in the current buffer.
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458 */
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459 (position))
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460 {
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461 struct Lisp_Marker *marker;
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462 Memind pos;
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463
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464 /* A small optimization trick: convert POS to memind now, rather
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465 than converting every marker's memory index to bufpos. */
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466 pos = bytind_to_memind (current_buffer,
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|
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467 get_buffer_pos_byte (current_buffer, position,
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468 GB_COERCE_RANGE));
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469
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470 for (marker = BUF_MARKERS (current_buffer);
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471 marker;
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472 marker = marker_next (marker))
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|
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473 {
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|
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474 /* We use marker->memind, so we don't have to go through the
|
|
|
475 unwieldy operation of creating a Lisp_Object for
|
|
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476 marker_position() every time around. */
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|
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477 if (marker->memind == pos)
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|
|
478 return Qt;
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|
|
479 }
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480
|
|
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481 return Qnil;
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|
|
482 }
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|
|
483 #endif /* 0 */
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|
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484
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|
|
485 #ifdef MEMORY_USAGE_STATS
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486
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|
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487 int
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488 compute_buffer_marker_usage (struct buffer *b, struct overhead_stats *ovstats)
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|
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489 {
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|
|
490 struct Lisp_Marker *m;
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|
|
491 int total = 0;
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|
|
492 int overhead;
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|
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493
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|
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494 for (m = BUF_MARKERS (b); m; m = m->next)
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|
|
495 total += sizeof (struct Lisp_Marker);
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|
|
496 ovstats->was_requested += total;
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|
|
497 overhead = fixed_type_block_overhead (total);
|
|
|
498 /* #### claiming this is all malloc overhead is not really right,
|
|
|
499 but it has to go somewhere. */
|
|
|
500 ovstats->malloc_overhead += overhead;
|
|
|
501 return total + overhead;
|
|
|
502 }
|
|
|
503
|
|
|
504 #endif /* MEMORY_USAGE_STATS */
|
|
|
505
|
|
|
506
|
|
|
507 void
|
|
|
508 syms_of_marker (void)
|
|
|
509 {
|
|
|
510 DEFSUBR (Fmarker_position);
|
|
|
511 DEFSUBR (Fmarker_buffer);
|
|
|
512 DEFSUBR (Fset_marker);
|
|
|
513 DEFSUBR (Fcopy_marker);
|
|
|
514 DEFSUBR (Fmarker_insertion_type);
|
|
|
515 DEFSUBR (Fset_marker_insertion_type);
|
|
|
516 #if 0 /* FSFmacs crock */
|
|
|
517 DEFSUBR (Fbuffer_has_markers_at);
|
|
|
518 #endif
|
|
|
519 }
|
|
|
520
|
|
|
521 void
|
|
|
522 init_buffer_markers (struct buffer *b)
|
|
|
523 {
|
|
|
524 Lisp_Object buf;
|
|
|
525
|
|
|
526 XSETBUFFER (buf, b);
|
|
|
527 b->mark = Fmake_marker ();
|
|
|
528 BUF_MARKERS (b) = 0;
|
|
|
529 b->point_marker = Fmake_marker ();
|
|
|
530 Fset_marker (b->point_marker,
|
|
|
531 /* For indirect buffers, point is already set. */
|
|
|
532 b->base_buffer ? make_int (BUF_PT (b)) : make_int (1),
|
|
|
533 buf);
|
|
|
534 }
|
|
|
535
|
|
|
536 void
|
|
|
537 uninit_buffer_markers (struct buffer *b)
|
|
|
538 {
|
|
|
539 /* Unchain all markers of this buffer
|
|
|
540 and leave them pointing nowhere. */
|
|
|
541 REGISTER struct Lisp_Marker *m, *next;
|
|
|
542 for (m = BUF_MARKERS (b); m; m = next)
|
|
|
543 {
|
|
|
544 m->buffer = 0;
|
|
|
545 next = marker_next (m);
|
|
|
546 marker_next (m) = 0;
|
|
|
547 marker_prev (m) = 0;
|
|
|
548 }
|
|
|
549 BUF_MARKERS (b) = 0;
|
|
|
550 }
|
