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0
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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, void (*markobj) (Lisp_Object))
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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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265
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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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0
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61 if (print_readably)
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272
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62 error ("printing unreadable object #<marker 0x%lx>", (long) marker);
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265
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63
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0
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64 write_c_string (GETTEXT ("#<marker "), printcharfun);
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265
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65 if (!marker->buffer)
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0
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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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265
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69 sprintf (buf, "at %d in ", marker_position (obj));
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0
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70 write_c_string (buf, printcharfun);
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265
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71 print_internal (marker->buffer->name, printcharfun, 0);
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0
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72 }
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272
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73 sprintf (buf, " 0x%lx>", (long) marker);
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265
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74 write_c_string (buf, printcharfun);
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0
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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 o1, Lisp_Object o2, int depth)
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79 {
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80 struct buffer *b1 = XMARKER (o1)->buffer;
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81 if (b1 != XMARKER (o2)->buffer)
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82 return (0);
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83 else if (!b1)
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84 /* All markers pointing nowhere are equal */
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85 return (1);
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86 else
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87 return ((XMARKER (o1)->memind == XMARKER (o2)->memind));
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88 }
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89
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90 static unsigned long
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91 marker_hash (Lisp_Object obj, int depth)
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92 {
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93 unsigned long hash = (unsigned long) XMARKER (obj)->buffer;
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94 if (hash)
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95 hash = HASH2 (hash, XMARKER (obj)->memind);
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96 return hash;
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97 }
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98
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272
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99 DEFINE_BASIC_LRECORD_IMPLEMENTATION ("marker", marker,
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100 mark_marker, print_marker, 0,
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101 marker_equal, marker_hash,
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102 struct Lisp_Marker);
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0
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103
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104 /* Operations on markers. */
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105
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20
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106 DEFUN ("marker-buffer", Fmarker_buffer, 1, 1, 0, /*
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0
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107 Return the buffer that MARKER points into, or nil if none.
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272
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108 Return nil if MARKER points into a dead buffer or doesn't point anywhere.
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20
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109 */
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110 (marker))
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0
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111 {
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272
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112 struct buffer *buf;
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0
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113 CHECK_MARKER (marker);
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272
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114 /* Return marker's buffer only if it is not dead. */
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115 if ((buf = XMARKER (marker)->buffer) && BUFFER_LIVE_P (buf))
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0
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116 {
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272
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117 Lisp_Object buffer;
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118 XSETBUFFER (buffer, buf);
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119 return buffer;
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0
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120 }
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121 return Qnil;
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122 }
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123
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20
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124 DEFUN ("marker-position", Fmarker_position, 1, 1, 0, /*
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0
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125 Return the position MARKER points at, as a character number.
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272
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126 Return `nil' if marker doesn't point anywhere.
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20
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127 */
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128 (marker))
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0
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129 {
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130 CHECK_MARKER (marker);
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272
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131 return XMARKER (marker)->buffer ? make_int (marker_position (marker)) : Qnil;
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0
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132 }
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133
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134 #if 0 /* useful debugging function */
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135
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136 static void
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137 check_marker_circularities (struct buffer *buf)
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138 {
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139 struct Lisp_Marker *tortoise, *hare;
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140
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141 tortoise = BUF_MARKERS (buf);
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142 hare = tortoise;
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143
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144 if (!tortoise)
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145 return;
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146
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147 while (1)
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148 {
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149 assert (hare->buffer == buf);
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150 hare = hare->next;
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151 if (!hare)
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152 return;
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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 tortoise = tortoise->next;
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158 assert (tortoise != hare);
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159 }
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160 }
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161
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162 #endif
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163
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164 static Lisp_Object
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165 set_marker_internal (Lisp_Object marker, Lisp_Object pos, Lisp_Object buffer,
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166 int restricted_p)
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167 {
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168 Bufpos charno;
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169 struct buffer *b;
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170 struct Lisp_Marker *m;
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171 int point_p;
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172
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173 CHECK_MARKER (marker);
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174
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175 point_p = POINT_MARKER_P (marker);
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176
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177 /* If position is nil or a marker that points nowhere,
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178 make this marker point nowhere. */
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179 if (NILP (pos) ||
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180 (MARKERP (pos) && !XMARKER (pos)->buffer))
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181 {
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182 if (point_p)
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183 signal_simple_error ("can't make point-marker point nowhere",
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184 marker);
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185 if (XMARKER (marker)->buffer)
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186 unchain_marker (marker);
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187 return marker;
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188 }
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189
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190 CHECK_INT_COERCE_MARKER (pos);
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191 if (NILP (buffer))
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192 b = current_buffer;
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193 else
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194 {
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195 CHECK_BUFFER (buffer);
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196 b = XBUFFER (buffer);
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197 /* If buffer is dead, set marker to point nowhere. */
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198 if (!BUFFER_LIVE_P (XBUFFER (buffer)))
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199 {
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200 if (point_p)
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201 signal_simple_error
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202 ("can't move point-marker in a killed buffer", marker);
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203 if (XMARKER (marker)->buffer)
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204 unchain_marker (marker);
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205 return marker;
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206 }
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207 }
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208
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209 charno = XINT (pos);
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210 m = XMARKER (marker);
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211
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212 if (restricted_p)
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213 {
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214 if (charno < BUF_BEGV (b)) charno = BUF_BEGV (b);
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215 if (charno > BUF_ZV (b)) charno = BUF_ZV (b);
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216 }
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217 else
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218 {
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219 if (charno < BUF_BEG (b)) charno = BUF_BEG (b);
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220 if (charno > BUF_Z (b)) charno = BUF_Z (b);
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221 }
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222
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223 if (point_p)
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224 {
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225 #ifndef moving_point_by_moving_its_marker_is_a_bug
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226 BUF_SET_PT (b, charno); /* this will move the marker */
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227 #else /* It's not a feature, so it must be a bug */
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228 signal_simple_error ("DEBUG: attempt to move point via point-marker",
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229 marker);
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230 #endif
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231 }
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232 else
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233 {
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234 m->memind = bufpos_to_memind (b, charno);
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235 }
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236
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237 if (m->buffer != b)
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238 {
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239 if (point_p)
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240 signal_simple_error ("can't change buffer of point-marker", marker);
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241 if (m->buffer != 0)
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242 unchain_marker (marker);
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243 m->buffer = b;
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244 marker_next (m) = BUF_MARKERS (b);
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245 marker_prev (m) = 0;
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246 if (BUF_MARKERS (b))
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247 marker_prev (BUF_MARKERS (b)) = m;
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248 BUF_MARKERS (b) = m;
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249 }
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265
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250
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0
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251 return marker;
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252 }
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253
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254
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20
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255 DEFUN ("set-marker", Fset_marker, 2, 3, 0, /*
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0
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256 Position MARKER before character number NUMBER in BUFFER.
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257 BUFFER defaults to the current buffer.
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258 If NUMBER is nil, makes marker point nowhere.
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259 Then it no longer slows down editing in any buffer.
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260 If this marker was returned by (point-marker t), then changing its position
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261 moves point. You cannot change its buffer or make it point nowhere.
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262 Returns MARKER.
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20
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263 */
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264 (marker, number, buffer))
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0
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265 {
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266 return set_marker_internal (marker, number, buffer, 0);
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267 }
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268
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269
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270 /* This version of Fset_marker won't let the position
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271 be outside the visible part. */
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272
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272 Lisp_Object
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0
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273 set_marker_restricted (Lisp_Object marker, Lisp_Object pos, Lisp_Object buffer)
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274 {
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275 return set_marker_internal (marker, pos, buffer, 1);
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276 }
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277
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278
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279 /* This is called during garbage collection,
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280 so we must be careful to ignore and preserve mark bits,
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281 including those in chain fields of markers. */
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282
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283 void
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284 unchain_marker (Lisp_Object m)
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285 {
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286 struct Lisp_Marker *marker = XMARKER (m);
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287 struct buffer *b = marker->buffer;
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288
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289 if (b == 0)
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290 return;
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291
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227
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292 #ifdef ERROR_CHECK_GC
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0
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293 assert (BUFFER_LIVE_P (b));
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227
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294 #endif
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0
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295
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296 if (marker_next (marker))
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297 marker_prev (marker_next (marker)) = marker_prev (marker);
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298 if (marker_prev (marker))
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299 marker_next (marker_prev (marker)) = marker_next (marker);
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300 else
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301 BUF_MARKERS (b) = marker_next (marker);
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302
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227
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303 #ifdef ERROR_CHECK_GC
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0
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304 assert (marker != XMARKER (b->point_marker));
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227
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305 #endif
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0
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306
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307 marker->buffer = 0;
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308 }
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309
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310 Bytind
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311 bi_marker_position (Lisp_Object marker)
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312 {
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313 struct Lisp_Marker *m = XMARKER (marker);
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314 struct buffer *buf = m->buffer;
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315 Bytind pos;
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316
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317 if (!buf)
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318 error ("Marker does not point anywhere");
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319
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320 /* FSF claims that marker indices could end up denormalized, i.e.
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321 in the gap. This is way bogus if it ever happens, and means
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322 something fucked up elsewhere. Since I've overhauled all this
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323 shit, I don't think this can happen. In any case, the following
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324 macro has an assert() in it that will catch these denormalized
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325 positions. */
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326 pos = memind_to_bytind (buf, m->memind);
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327
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227
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328 #ifdef ERROR_CHECK_BUFPOS
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0
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329 if (pos < BI_BUF_BEG (buf) || pos > BI_BUF_Z (buf))
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330 abort ();
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227
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331 #endif
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0
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332
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333 return pos;
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334 }
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335
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336 Bufpos
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337 marker_position (Lisp_Object marker)
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338 {
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339 struct buffer *buf = XMARKER (marker)->buffer;
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340
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341 if (!buf)
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342 error ("Marker does not point anywhere");
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343
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344 return bytind_to_bufpos (buf, bi_marker_position (marker));
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345 }
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346
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347 void
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348 set_bi_marker_position (Lisp_Object marker, Bytind pos)
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|
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349 {
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350 struct Lisp_Marker *m = XMARKER (marker);
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351 struct buffer *buf = m->buffer;
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352
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|
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353 if (!buf)
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354 error ("Marker does not point anywhere");
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355
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227
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356 #ifdef ERROR_CHECK_BUFPOS
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0
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357 if (pos < BI_BUF_BEG (buf) || pos > BI_BUF_Z (buf))
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358 abort ();
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227
|
359 #endif
|
|
0
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360
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361 m->memind = bytind_to_memind (buf, pos);
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|
|
362 }
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363
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364 void
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365 set_marker_position (Lisp_Object marker, Bufpos pos)
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|
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366 {
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|
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367 struct buffer *buf = XMARKER (marker)->buffer;
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368
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|
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369 if (!buf)
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370 error ("Marker does not point anywhere");
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371
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372 set_bi_marker_position (marker, bufpos_to_bytind (buf, pos));
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|
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373 }
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|
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374
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|
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375 static Lisp_Object
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|
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376 copy_marker_1 (Lisp_Object marker, Lisp_Object type, int noseeum)
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|
|
377 {
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|
|
378 REGISTER Lisp_Object new;
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|
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379
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|
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380 while (1)
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|
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381 {
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|
|
382 if (INTP (marker) || MARKERP (marker))
|
|
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383 {
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|
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384 if (noseeum)
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|
|
385 new = noseeum_make_marker ();
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|
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386 else
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|
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387 new = Fmake_marker ();
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|
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388 Fset_marker (new, marker,
|
|
|
389 (MARKERP (marker) ? Fmarker_buffer (marker) : Qnil));
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|
|
390 XMARKER (new)->insertion_type = !NILP (type);
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|
|
391 return new;
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|
|
392 }
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|
|
393 else
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|
|
394 marker = wrong_type_argument (Qinteger_or_marker_p, marker);
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|
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395 }
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|
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396
|
|
|
397 RETURN_NOT_REACHED (Qnil) /* not reached */
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|
|
398 }
|
|
|
399
|
|
20
|
400 DEFUN ("copy-marker", Fcopy_marker, 1, 2, 0, /*
|
|
0
|
401 Return a new marker pointing at the same place as MARKER.
|
|
|
402 If argument is a number, makes a new marker pointing
|
|
|
403 at that position in the current buffer.
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|
|
404 The optional argument TYPE specifies the insertion type of the new marker;
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|
|
405 see `marker-insertion-type'.
|
|
20
|
406 */
|
|
|
407 (marker, type))
|
|
0
|
408 {
|
|
|
409 return copy_marker_1 (marker, type, 0);
|
|
|
410 }
|
|
|
411
|
|
|
412 Lisp_Object
|
|
|
413 noseeum_copy_marker (Lisp_Object marker, Lisp_Object type)
|
|
|
414 {
|
|
|
415 return copy_marker_1 (marker, type, 1);
|
|
|
416 }
|
|
|
417
|
|
20
|
418 DEFUN ("marker-insertion-type", Fmarker_insertion_type, 1, 1, 0, /*
|
|
0
|
419 Return insertion type of MARKER: t if it stays after inserted text.
|
|
|
420 nil means the marker stays before text inserted there.
|
|
20
|
421 */
|
|
|
422 (marker))
|
|
0
|
423 {
|
|
|
424 CHECK_MARKER (marker);
|
|
|
425 return XMARKER (marker)->insertion_type ? Qt : Qnil;
|
|
|
426 }
|
|
|
427
|
|
20
|
428 DEFUN ("set-marker-insertion-type", Fset_marker_insertion_type, 2, 2, 0, /*
|
|
0
|
429 Set the insertion-type of MARKER to TYPE.
|
|
|
430 If TYPE is t, it means the marker advances when you insert text at it.
|
|
|
431 If TYPE is nil, it means the marker stays behind when you insert text at it.
|
|
20
|
432 */
|
|
|
433 (marker, type))
|
|
0
|
434 {
|
|
|
435 CHECK_MARKER (marker);
|
|
|
436
|
|
|
437 XMARKER (marker)->insertion_type = ! NILP (type);
|
|
|
438 return type;
|
|
|
439 }
|
|
|
440
|
|
265
|
441 /* #### What is the possible use of this? It looks quite useless to
|
|
|
442 me, because there is no way to find *which* markers are positioned
|
|
|
443 at POSITION. Additional bogosity bonus: (buffer-has-markers-at
|
|
|
444 (point)) will always return t because of the `point-marker'. The
|
|
|
445 same goes for the position of mark. Bletch!
|
|
|
446
|
|
|
447 Someone should discuss this with Stallman, but I don't have the
|
|
|
448 stomach. In fact, this function sucks so badly that I'm disabling
|
|
|
449 it by default (although I've debugged it). If you want to use it,
|
|
|
450 use extents instead. --hniksic */
|
|
|
451 #if 0
|
|
|
452 xxDEFUN ("buffer-has-markers-at", Fbuffer_has_markers_at, 1, 1, 0, /*
|
|
|
453 Return t if there are markers pointing at POSITION in the current buffer.
|
|
|
454 */
|
|
|
455 (position))
|
|
|
456 {
|
|
|
457 struct Lisp_Marker *marker;
|
|
|
458 Memind pos;
|
|
|
459
|
|
|
460 /* A small optimization trick: convert POS to memind now, rather
|
|
|
461 than converting every marker's memory index to bufpos. */
|
|
|
462 pos = bytind_to_memind (current_buffer,
|
|
|
463 get_buffer_pos_byte (current_buffer, position,
|
|
|
464 GB_COERCE_RANGE));
|
|
|
465
|
|
|
466 for (marker = BUF_MARKERS (current_buffer);
|
|
|
467 marker;
|
|
|
468 marker = marker_next (marker))
|
|
|
469 {
|
|
|
470 /* We use marker->memind, so we don't have to go through the
|
|
|
471 unwieldy operation of creating a Lisp_Object for
|
|
|
472 marker_position() every time around. */
|
|
|
473 if (marker->memind == pos)
|
|
|
474 return Qt;
|
|
|
475 }
|
|
|
476
|
|
|
477 return Qnil;
|
|
|
478 }
|
|
|
479 #endif /* 0 */
|
|
|
480
|
|
0
|
481 #ifdef MEMORY_USAGE_STATS
|
|
|
482
|
|
|
483 int
|
|
|
484 compute_buffer_marker_usage (struct buffer *b, struct overhead_stats *ovstats)
|
|
|
485 {
|
|
|
486 struct Lisp_Marker *m;
|
|
|
487 int total = 0;
|
|
|
488 int overhead;
|
|
|
489
|
|
|
490 for (m = BUF_MARKERS (b); m; m = m->next)
|
|
|
491 total += sizeof (struct Lisp_Marker);
|
|
|
492 ovstats->was_requested += total;
|
|
|
493 overhead = fixed_type_block_overhead (total);
|
|
|
494 /* #### claiming this is all malloc overhead is not really right,
|
|
|
495 but it has to go somewhere. */
|
|
|
496 ovstats->malloc_overhead += overhead;
|
|
|
497 return total + overhead;
|
|
|
498 }
|
|
|
499
|
|
|
500 #endif /* MEMORY_USAGE_STATS */
|
|
|
501
|
|
|
502
|
|
|
503 void
|
|
|
504 syms_of_marker (void)
|
|
|
505 {
|
|
20
|
506 DEFSUBR (Fmarker_position);
|
|
|
507 DEFSUBR (Fmarker_buffer);
|
|
|
508 DEFSUBR (Fset_marker);
|
|
|
509 DEFSUBR (Fcopy_marker);
|
|
|
510 DEFSUBR (Fmarker_insertion_type);
|
|
|
511 DEFSUBR (Fset_marker_insertion_type);
|
|
265
|
512 #if 0 /* FSFmacs crock */
|
|
|
513 DEFSUBR (Fbuffer_has_markers_at);
|
|
|
514 #endif
|
|
0
|
515 }
|
|
|
516
|
|
|
517 void
|
|
|
518 init_buffer_markers (struct buffer *b)
|
|
|
519 {
|
|
272
|
520 Lisp_Object buf;
|
|
0
|
521
|
|
|
522 XSETBUFFER (buf, b);
|
|
|
523 b->mark = Fmake_marker ();
|
|
|
524 BUF_MARKERS (b) = 0;
|
|
|
525 b->point_marker = Fmake_marker ();
|
|
|
526 Fset_marker (b->point_marker, make_int (1), buf);
|
|
|
527 }
|
|
|
528
|
|
|
529 void
|
|
|
530 uninit_buffer_markers (struct buffer *b)
|
|
|
531 {
|
|
|
532 /* Unchain all markers of this buffer
|
|
|
533 and leave them pointing nowhere. */
|
|
|
534 REGISTER struct Lisp_Marker *m, *next;
|
|
|
535 for (m = BUF_MARKERS (b); m; m = next)
|
|
|
536 {
|
|
|
537 m->buffer = 0;
|
|
|
538 next = marker_next (m);
|
|
|
539 marker_next (m) = 0;
|
|
|
540 marker_prev (m) = 0;
|
|
|
541 }
|
|
|
542 BUF_MARKERS (b) = 0;
|
|
|
543 }
|
