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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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440
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41 Lisp_Marker *marker = XMARKER (obj);
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428
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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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440
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58 Lisp_Marker *marker = XMARKER (obj);
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428
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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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440
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80 Lisp_Marker *marker1 = XMARKER (obj1);
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81 Lisp_Marker *marker2 = XMARKER (obj2);
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428
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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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440
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99 { XD_LISP_OBJECT, offsetof (Lisp_Marker, next) },
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100 { XD_LISP_OBJECT, offsetof (Lisp_Marker, prev) },
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101 { XD_LISP_OBJECT, offsetof (Lisp_Marker, buffer) },
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428
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102 { XD_END }
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103 };
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104
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105 DEFINE_BASIC_LRECORD_IMPLEMENTATION ("marker", marker,
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106 mark_marker, print_marker, 0,
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107 marker_equal, marker_hash, marker_description,
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440
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108 Lisp_Marker);
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428
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109
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110 /* Operations on markers. */
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111
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112 DEFUN ("marker-buffer", Fmarker_buffer, 1, 1, 0, /*
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113 Return the buffer that MARKER points into, or nil if none.
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114 Return nil if MARKER points into a dead buffer or doesn't point anywhere.
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115 */
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116 (marker))
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117 {
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118 struct buffer *buf;
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119 CHECK_MARKER (marker);
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120 /* Return marker's buffer only if it is not dead. */
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121 if ((buf = XMARKER (marker)->buffer) && BUFFER_LIVE_P (buf))
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122 {
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123 Lisp_Object buffer;
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124 XSETBUFFER (buffer, buf);
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125 return buffer;
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126 }
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127 return Qnil;
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128 }
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129
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130 DEFUN ("marker-position", Fmarker_position, 1, 1, 0, /*
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131 Return the position MARKER points at, as a character number.
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132 Return `nil' if marker doesn't point anywhere.
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133 */
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134 (marker))
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135 {
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136 CHECK_MARKER (marker);
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137 return XMARKER (marker)->buffer ? make_int (marker_position (marker)) : Qnil;
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138 }
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139
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140 #if 0 /* useful debugging function */
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141
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142 static void
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143 check_marker_circularities (struct buffer *buf)
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144 {
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440
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145 Lisp_Marker *tortoise, *hare;
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428
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146
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147 tortoise = BUF_MARKERS (buf);
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148 hare = tortoise;
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149
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150 if (!tortoise)
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151 return;
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152
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153 while (1)
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154 {
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155 assert (hare->buffer == buf);
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156 hare = hare->next;
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157 if (!hare)
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158 return;
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159 assert (hare->buffer == buf);
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160 hare = hare->next;
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161 if (!hare)
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162 return;
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163 tortoise = tortoise->next;
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164 assert (tortoise != hare);
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165 }
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166 }
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167
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168 #endif
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169
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170 static Lisp_Object
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444
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171 set_marker_internal (Lisp_Object marker, Lisp_Object position,
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172 Lisp_Object buffer, int restricted_p)
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428
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173 {
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174 Bufpos charno;
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175 struct buffer *b;
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440
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176 Lisp_Marker *m;
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428
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177 int point_p;
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178
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179 CHECK_MARKER (marker);
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180
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181 point_p = POINT_MARKER_P (marker);
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182
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183 /* If position is nil or a marker that points nowhere,
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184 make this marker point nowhere. */
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444
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185 if (NILP (position) ||
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186 (MARKERP (position) && !XMARKER (position)->buffer))
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428
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187 {
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188 if (point_p)
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189 signal_simple_error ("Can't make point-marker point nowhere",
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190 marker);
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191 if (XMARKER (marker)->buffer)
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192 unchain_marker (marker);
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193 return marker;
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194 }
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195
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444
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196 CHECK_INT_COERCE_MARKER (position);
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428
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197 if (NILP (buffer))
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198 b = current_buffer;
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199 else
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200 {
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201 CHECK_BUFFER (buffer);
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202 b = XBUFFER (buffer);
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203 /* If buffer is dead, set marker to point nowhere. */
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204 if (!BUFFER_LIVE_P (XBUFFER (buffer)))
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205 {
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206 if (point_p)
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207 signal_simple_error
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208 ("Can't move point-marker in a killed buffer", marker);
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209 if (XMARKER (marker)->buffer)
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210 unchain_marker (marker);
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211 return marker;
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212 }
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213 }
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214
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444
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215 charno = XINT (position);
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428
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216 m = XMARKER (marker);
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217
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218 if (restricted_p)
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219 {
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220 if (charno < BUF_BEGV (b)) charno = BUF_BEGV (b);
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221 if (charno > BUF_ZV (b)) charno = BUF_ZV (b);
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222 }
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223 else
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224 {
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225 if (charno < BUF_BEG (b)) charno = BUF_BEG (b);
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226 if (charno > BUF_Z (b)) charno = BUF_Z (b);
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227 }
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228
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229 if (point_p)
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230 {
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231 #ifndef moving_point_by_moving_its_marker_is_a_bug
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232 BUF_SET_PT (b, charno); /* this will move the marker */
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233 #else /* It's not a feature, so it must be a bug */
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234 signal_simple_error ("DEBUG: attempt to move point via point-marker",
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235 marker);
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236 #endif
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237 }
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238 else
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239 {
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240 m->memind = bufpos_to_memind (b, charno);
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241 }
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242
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243 if (m->buffer != b)
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244 {
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245 if (point_p)
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246 signal_simple_error ("Can't change buffer of point-marker", marker);
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247 if (m->buffer != 0)
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248 unchain_marker (marker);
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249 m->buffer = b;
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250 marker_next (m) = BUF_MARKERS (b);
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251 marker_prev (m) = 0;
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252 if (BUF_MARKERS (b))
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253 marker_prev (BUF_MARKERS (b)) = m;
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254 BUF_MARKERS (b) = m;
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255 }
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256
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257 return marker;
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258 }
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259
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260
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261 DEFUN ("set-marker", Fset_marker, 2, 3, 0, /*
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444
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262 Move MARKER to position POSITION in BUFFER.
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263 POSITION can be a marker, an integer or nil. If POSITION is an
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264 integer, make MARKER point before the POSITIONth character in BUFFER.
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265 If POSITION is nil, makes MARKER point nowhere. Then it no longer
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266 slows down editing in any buffer. If POSITION is less than 1, move
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267 MARKER to the beginning of BUFFER. If POSITION is greater than the
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268 size of BUFFER, move MARKER to the end of BUFFER.
|
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428
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269 BUFFER defaults to the current buffer.
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444
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270 If this marker was returned by (point-marker t), then changing its
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271 position moves point. You cannot change its buffer or make it point
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272 nowhere.
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273 The return value is MARKER.
|
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428
|
274 */
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444
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275 (marker, position, buffer))
|
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428
|
276 {
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444
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277 return set_marker_internal (marker, position, buffer, 0);
|
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428
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278 }
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|
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279
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|
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280
|
|
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281 /* This version of Fset_marker won't let the position
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282 be outside the visible part. */
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283 Lisp_Object
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444
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284 set_marker_restricted (Lisp_Object marker, Lisp_Object position,
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285 Lisp_Object buffer)
|
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428
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286 {
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444
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287 return set_marker_internal (marker, position, buffer, 1);
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428
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288 }
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289
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290
|
|
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291 /* This is called during garbage collection,
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292 so we must be careful to ignore and preserve mark bits,
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293 including those in chain fields of markers. */
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294
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295 void
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296 unchain_marker (Lisp_Object m)
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|
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297 {
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440
|
298 Lisp_Marker *marker = XMARKER (m);
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428
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299 struct buffer *b = marker->buffer;
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300
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|
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301 if (b == 0)
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302 return;
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303
|
|
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304 #ifdef ERROR_CHECK_GC
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305 assert (BUFFER_LIVE_P (b));
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306 #endif
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307
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|
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308 if (marker_next (marker))
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309 marker_prev (marker_next (marker)) = marker_prev (marker);
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310 if (marker_prev (marker))
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311 marker_next (marker_prev (marker)) = marker_next (marker);
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|
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312 else
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313 BUF_MARKERS (b) = marker_next (marker);
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314
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|
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315 #ifdef ERROR_CHECK_GC
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|
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316 assert (marker != XMARKER (b->point_marker));
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|
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317 #endif
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|
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318
|
|
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319 marker->buffer = 0;
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|
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320 }
|
|
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321
|
|
|
322 Bytind
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|
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323 bi_marker_position (Lisp_Object marker)
|
|
|
324 {
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|
440
|
325 Lisp_Marker *m = XMARKER (marker);
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|
428
|
326 struct buffer *buf = m->buffer;
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|
|
327 Bytind pos;
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328
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|
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329 if (!buf)
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330 error ("Marker does not point anywhere");
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|
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331
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|
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332 /* FSF claims that marker indices could end up denormalized, i.e.
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333 in the gap. This is way bogus if it ever happens, and means
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334 something fucked up elsewhere. Since I've overhauled all this
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|
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335 shit, I don't think this can happen. In any case, the following
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|
|
336 macro has an assert() in it that will catch these denormalized
|
|
|
337 positions. */
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|
|
338 pos = memind_to_bytind (buf, m->memind);
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|
|
339
|
|
|
340 #ifdef ERROR_CHECK_BUFPOS
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|
|
341 if (pos < BI_BUF_BEG (buf) || pos > BI_BUF_Z (buf))
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|
|
342 abort ();
|
|
|
343 #endif
|
|
|
344
|
|
|
345 return pos;
|
|
|
346 }
|
|
|
347
|
|
|
348 Bufpos
|
|
|
349 marker_position (Lisp_Object marker)
|
|
|
350 {
|
|
|
351 struct buffer *buf = XMARKER (marker)->buffer;
|
|
|
352
|
|
|
353 if (!buf)
|
|
|
354 error ("Marker does not point anywhere");
|
|
|
355
|
|
|
356 return bytind_to_bufpos (buf, bi_marker_position (marker));
|
|
|
357 }
|
|
|
358
|
|
|
359 void
|
|
|
360 set_bi_marker_position (Lisp_Object marker, Bytind pos)
|
|
|
361 {
|
|
440
|
362 Lisp_Marker *m = XMARKER (marker);
|
|
428
|
363 struct buffer *buf = m->buffer;
|
|
|
364
|
|
|
365 if (!buf)
|
|
|
366 error ("Marker does not point anywhere");
|
|
|
367
|
|
|
368 #ifdef ERROR_CHECK_BUFPOS
|
|
|
369 if (pos < BI_BUF_BEG (buf) || pos > BI_BUF_Z (buf))
|
|
|
370 abort ();
|
|
|
371 #endif
|
|
|
372
|
|
|
373 m->memind = bytind_to_memind (buf, pos);
|
|
|
374 }
|
|
|
375
|
|
|
376 void
|
|
|
377 set_marker_position (Lisp_Object marker, Bufpos pos)
|
|
|
378 {
|
|
|
379 struct buffer *buf = XMARKER (marker)->buffer;
|
|
|
380
|
|
|
381 if (!buf)
|
|
|
382 error ("Marker does not point anywhere");
|
|
|
383
|
|
|
384 set_bi_marker_position (marker, bufpos_to_bytind (buf, pos));
|
|
|
385 }
|
|
|
386
|
|
|
387 static Lisp_Object
|
|
|
388 copy_marker_1 (Lisp_Object marker, Lisp_Object type, int noseeum)
|
|
|
389 {
|
|
|
390 REGISTER Lisp_Object new;
|
|
|
391
|
|
|
392 while (1)
|
|
|
393 {
|
|
|
394 if (INTP (marker) || MARKERP (marker))
|
|
|
395 {
|
|
|
396 if (noseeum)
|
|
|
397 new = noseeum_make_marker ();
|
|
|
398 else
|
|
|
399 new = Fmake_marker ();
|
|
|
400 Fset_marker (new, marker,
|
|
|
401 (MARKERP (marker) ? Fmarker_buffer (marker) : Qnil));
|
|
|
402 XMARKER (new)->insertion_type = !NILP (type);
|
|
|
403 return new;
|
|
|
404 }
|
|
|
405 else
|
|
|
406 marker = wrong_type_argument (Qinteger_or_marker_p, marker);
|
|
|
407 }
|
|
|
408
|
|
|
409 RETURN_NOT_REACHED (Qnil) /* not reached */
|
|
|
410 }
|
|
|
411
|
|
|
412 DEFUN ("copy-marker", Fcopy_marker, 1, 2, 0, /*
|
|
444
|
413 Return a new marker pointing at the same place as MARKER-OR-INTEGER.
|
|
|
414 If MARKER-OR-INTEGER is an integer, return a new marker pointing
|
|
428
|
415 at that position in the current buffer.
|
|
444
|
416 Optional argument MARKER-TYPE specifies the insertion type of the new
|
|
|
417 marker; see `marker-insertion-type'.
|
|
428
|
418 */
|
|
444
|
419 (marker_or_integer, marker_type))
|
|
428
|
420 {
|
|
444
|
421 return copy_marker_1 (marker_or_integer, marker_type, 0);
|
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428
|
422 }
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|
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423
|
|
|
424 Lisp_Object
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444
|
425 noseeum_copy_marker (Lisp_Object marker, Lisp_Object marker_type)
|
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428
|
426 {
|
|
444
|
427 return copy_marker_1 (marker, marker_type, 1);
|
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428
|
428 }
|
|
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429
|
|
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430 DEFUN ("marker-insertion-type", Fmarker_insertion_type, 1, 1, 0, /*
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|
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431 Return insertion type of MARKER: t if it stays after inserted text.
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|
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432 nil means the marker stays before text inserted there.
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|
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433 */
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|
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434 (marker))
|
|
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435 {
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|
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436 CHECK_MARKER (marker);
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437 return XMARKER (marker)->insertion_type ? Qt : Qnil;
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|
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438 }
|
|
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439
|
|
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440 DEFUN ("set-marker-insertion-type", Fset_marker_insertion_type, 2, 2, 0, /*
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|
|
441 Set the insertion-type of MARKER to TYPE.
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|
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442 If TYPE is t, it means the marker advances when you insert text at it.
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|
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443 If TYPE is nil, it means the marker stays behind when you insert text at it.
|
|
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444 */
|
|
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445 (marker, type))
|
|
|
446 {
|
|
|
447 CHECK_MARKER (marker);
|
|
|
448
|
|
|
449 XMARKER (marker)->insertion_type = ! NILP (type);
|
|
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450 return type;
|
|
|
451 }
|
|
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452
|
|
|
453 /* #### What is the possible use of this? It looks quite useless to
|
|
|
454 me, because there is no way to find *which* markers are positioned
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|
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455 at POSITION. Additional bogosity bonus: (buffer-has-markers-at
|
|
|
456 (point)) will always return t because of the `point-marker'. The
|
|
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457 same goes for the position of mark. Bletch!
|
|
|
458
|
|
|
459 Someone should discuss this with Stallman, but I don't have the
|
|
|
460 stomach. In fact, this function sucks so badly that I'm disabling
|
|
|
461 it by default (although I've debugged it). If you want to use it,
|
|
|
462 use extents instead. --hniksic */
|
|
|
463 #if 0
|
|
|
464 xxDEFUN ("buffer-has-markers-at", Fbuffer_has_markers_at, 1, 1, 0, /*
|
|
|
465 Return t if there are markers pointing at POSITION in the current buffer.
|
|
|
466 */
|
|
|
467 (position))
|
|
|
468 {
|
|
440
|
469 Lisp_Marker *marker;
|
|
428
|
470 Memind pos;
|
|
|
471
|
|
|
472 /* A small optimization trick: convert POS to memind now, rather
|
|
|
473 than converting every marker's memory index to bufpos. */
|
|
|
474 pos = bytind_to_memind (current_buffer,
|
|
|
475 get_buffer_pos_byte (current_buffer, position,
|
|
|
476 GB_COERCE_RANGE));
|
|
|
477
|
|
|
478 for (marker = BUF_MARKERS (current_buffer);
|
|
|
479 marker;
|
|
|
480 marker = marker_next (marker))
|
|
|
481 {
|
|
|
482 /* We use marker->memind, so we don't have to go through the
|
|
|
483 unwieldy operation of creating a Lisp_Object for
|
|
|
484 marker_position() every time around. */
|
|
|
485 if (marker->memind == pos)
|
|
|
486 return Qt;
|
|
|
487 }
|
|
|
488
|
|
|
489 return Qnil;
|
|
|
490 }
|
|
|
491 #endif /* 0 */
|
|
|
492
|
|
|
493 #ifdef MEMORY_USAGE_STATS
|
|
|
494
|
|
|
495 int
|
|
|
496 compute_buffer_marker_usage (struct buffer *b, struct overhead_stats *ovstats)
|
|
|
497 {
|
|
440
|
498 Lisp_Marker *m;
|
|
428
|
499 int total = 0;
|
|
|
500 int overhead;
|
|
|
501
|
|
|
502 for (m = BUF_MARKERS (b); m; m = m->next)
|
|
440
|
503 total += sizeof (Lisp_Marker);
|
|
428
|
504 ovstats->was_requested += total;
|
|
|
505 overhead = fixed_type_block_overhead (total);
|
|
|
506 /* #### claiming this is all malloc overhead is not really right,
|
|
|
507 but it has to go somewhere. */
|
|
|
508 ovstats->malloc_overhead += overhead;
|
|
|
509 return total + overhead;
|
|
|
510 }
|
|
|
511
|
|
|
512 #endif /* MEMORY_USAGE_STATS */
|
|
|
513
|
|
|
514
|
|
|
515 void
|
|
|
516 syms_of_marker (void)
|
|
|
517 {
|
|
442
|
518 INIT_LRECORD_IMPLEMENTATION (marker);
|
|
|
519
|
|
428
|
520 DEFSUBR (Fmarker_position);
|
|
|
521 DEFSUBR (Fmarker_buffer);
|
|
|
522 DEFSUBR (Fset_marker);
|
|
|
523 DEFSUBR (Fcopy_marker);
|
|
|
524 DEFSUBR (Fmarker_insertion_type);
|
|
|
525 DEFSUBR (Fset_marker_insertion_type);
|
|
|
526 #if 0 /* FSFmacs crock */
|
|
|
527 DEFSUBR (Fbuffer_has_markers_at);
|
|
|
528 #endif
|
|
|
529 }
|
|
|
530
|
|
|
531 void
|
|
|
532 init_buffer_markers (struct buffer *b)
|
|
|
533 {
|
|
|
534 Lisp_Object buf;
|
|
|
535
|
|
|
536 XSETBUFFER (buf, b);
|
|
|
537 b->mark = Fmake_marker ();
|
|
|
538 BUF_MARKERS (b) = 0;
|
|
|
539 b->point_marker = Fmake_marker ();
|
|
|
540 Fset_marker (b->point_marker,
|
|
|
541 /* For indirect buffers, point is already set. */
|
|
|
542 b->base_buffer ? make_int (BUF_PT (b)) : make_int (1),
|
|
|
543 buf);
|
|
|
544 }
|
|
|
545
|
|
|
546 void
|
|
|
547 uninit_buffer_markers (struct buffer *b)
|
|
|
548 {
|
|
|
549 /* Unchain all markers of this buffer
|
|
|
550 and leave them pointing nowhere. */
|
|
440
|
551 REGISTER Lisp_Marker *m, *next;
|
|
428
|
552 for (m = BUF_MARKERS (b); m; m = next)
|
|
|
553 {
|
|
|
554 m->buffer = 0;
|
|
|
555 next = marker_next (m);
|
|
|
556 marker_next (m) = 0;
|
|
|
557 marker_prev (m) = 0;
|
|
|
558 }
|
|
|
559 BUF_MARKERS (b) = 0;
|
|
|
560 }
|
