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428
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1 /* Indentation functions.
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2 Copyright (C) 1995 Board of Trustees, University of Illinois.
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3 Copyright (C) 1985, 1986, 1987, 1988, 1992, 1993, 1994, 1995
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4 Free Software Foundation, Inc.
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5
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6 This file is part of XEmacs.
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7
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8 XEmacs is free software; you can redistribute it and/or modify it
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9 under the terms of the GNU General Public License as published by the
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10 Free Software Foundation; either version 2, or (at your option) any
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11 later version.
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12
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13 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with XEmacs; see the file COPYING. If not, write to
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20 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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21 Boston, MA 02111-1307, USA. */
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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 /* Synched up with: 19.30. Diverges significantly from FSF. */
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26
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27
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28 #include <config.h>
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29 #include "lisp.h"
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30
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31 #include "buffer.h"
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32 #include "device.h"
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33 #include "extents.h"
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34 #include "faces.h"
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35 #include "frame.h"
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36 #include "glyphs.h"
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37 #include "insdel.h"
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38 #ifdef REGION_CACHE_NEEDS_WORK
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39 #include "region-cache.h"
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40 #endif
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41 #include "window.h"
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42
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43 Lisp_Object Qcoerce;
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44
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45 /* Indentation can insert tabs if this is non-zero;
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46 otherwise always uses spaces */
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47 int indent_tabs_mode;
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48
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49 /* Avoid recalculation by remembering things in these variables. */
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50
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51 /* Last value returned by current_column.
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52
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53 Some things set last_known_column_point to -1
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54 to mark the memoized value as invalid */
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55 static int last_known_column;
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56
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57 /* Last buffer searched by current_column */
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58 static struct buffer *last_known_column_buffer;
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59
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60 /* Value of point when current_column was called */
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61 static Bufpos last_known_column_point;
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62
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63 /* Value of MODIFF when current_column was called */
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64 static int last_known_column_modified;
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65
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66 static Bufpos
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67 last_visible_position (Bufpos pos, struct buffer *buf)
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68 {
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69 Lisp_Object buffer;
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70 Lisp_Object value;
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71
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72 XSETBUFFER (buffer, buf);
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73 value = Fprevious_single_property_change (make_int (pos), Qinvisible,
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74 buffer, Qnil);
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75 if (NILP (value))
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76 return 0; /* no visible position found */
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77 else
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78 /* #### bug bug bug!!! This will return the position of the beginning
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79 of an invisible extent; this extent is very likely to be start-closed,
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80 and thus the spaces inserted in `indent-to' will go inside the
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81 invisible extent.
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82
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83 Not sure what the correct solution is here. Rethink indent-to? */
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84 return XINT (value);
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85 }
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86
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87 #ifdef REGION_CACHE_NEEDS_WORK
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88
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89 /* Allocate or free the width run cache, as requested by the current
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90 state of current_buffer's cache_long_line_scans variable. */
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91 static void
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92 width_run_cache_on_off (struct buffer *buf)
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93 {
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94 if (NILP (buf->cache_long_line_scans))
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95 {
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96 /* It should be off. */
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97 if (buf->width_run_cache)
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98 {
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99 free_region_cache (buf->width_run_cache);
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100 buf->width_run_cache = 0;
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101 buf->width_table = Qnil;
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102 }
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103 }
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104 else
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105 {
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106 /* It should be on. */
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107 if (buf->width_run_cache == 0)
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108 {
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109 buf->width_run_cache = new_region_cache ();
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110 recompute_width_table (buf, buffer_display_table ());
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111 }
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112 }
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113 }
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114
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115 #endif /* REGION_CACHE_NEEDS_WORK */
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116
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117
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118 /* Cancel any recorded value of the horizontal position. */
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119
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120 void
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121 invalidate_current_column (void)
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122 {
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123 last_known_column_point = -1;
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124 }
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125
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126 int
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127 column_at_point (struct buffer *buf, Bufpos init_pos, int cur_col)
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128 {
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129 int col;
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130 int tab_seen;
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131 int tab_width = XINT (buf->tab_width);
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132 int post_tab;
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133 Bufpos pos = init_pos;
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134 Emchar c;
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135
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136 if (tab_width <= 0 || tab_width > 1000) tab_width = 8;
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137 col = tab_seen = post_tab = 0;
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138
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139 while (1)
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140 {
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141 if (pos <= BUF_BEGV (buf))
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142 break;
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143
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144 pos--;
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145 c = BUF_FETCH_CHAR (buf, pos);
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146 if (c == '\t')
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147 {
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148 if (tab_seen)
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149 col = ((col + tab_width) / tab_width) * tab_width;
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150
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151 post_tab += col;
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152 col = 0;
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153 tab_seen = 1;
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154 }
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155 else if (c == '\n' ||
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156 (EQ (buf->selective_display, Qt) && c == '\r'))
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157 break;
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158 else
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159 {
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160 /* #### This needs updating to handle the new redisplay. */
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161 /* #### FSFmacs looks at ctl_arrow, display tables.
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162 We need to do similar. */
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163 #if 0
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164 displayed_glyphs = glyphs_from_bufpos (sel_frame, buf,
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165 XWINDOW (selected_window),
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166 pos, dp, 0, col, 0, 0, 0);
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167 col += (displayed_glyphs->columns
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168 - (displayed_glyphs->begin_columns
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169 + displayed_glyphs->end_columns));
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170 #else /* XEmacs */
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171 #ifdef MULE
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172 col += XCHARSET_COLUMNS (CHAR_CHARSET (c));
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173 #else
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174 col ++;
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175 #endif /* MULE */
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176 #endif /* XEmacs */
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177 }
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178 }
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179
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180 if (tab_seen)
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181 {
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182 col = ((col + tab_width) / tab_width) * tab_width;
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183 col += post_tab;
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184 }
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185
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186 if (cur_col)
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187 {
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188 last_known_column_buffer = buf;
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189 last_known_column = col;
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190 last_known_column_point = init_pos;
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191 last_known_column_modified = BUF_MODIFF (buf);
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192 }
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193
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194 return col;
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195 }
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196
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197 int
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198 string_column_at_point (struct Lisp_String* s, Bufpos init_pos, int tab_width)
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199 {
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200 int col;
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201 int tab_seen;
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202 int post_tab;
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203 Bufpos pos = init_pos;
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204 Emchar c;
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205
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206 if (tab_width <= 0 || tab_width > 1000) tab_width = 8;
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207 col = tab_seen = post_tab = 0;
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208
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209 while (1)
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210 {
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211 if (pos <= 0)
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212 break;
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213
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214 pos--;
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215 c = string_char (s, pos);
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216 if (c == '\t')
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217 {
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218 if (tab_seen)
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219 col = ((col + tab_width) / tab_width) * tab_width;
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220
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221 post_tab += col;
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222 col = 0;
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223 tab_seen = 1;
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224 }
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225 else if (c == '\n')
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226 break;
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227 else
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228 #ifdef MULE
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229 col += XCHARSET_COLUMNS (CHAR_CHARSET (c));
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230 #else
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231 col ++;
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232 #endif /* MULE */
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233 }
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234
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235 if (tab_seen)
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236 {
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237 col = ((col + tab_width) / tab_width) * tab_width;
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238 col += post_tab;
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239 }
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240
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241 return col;
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242 }
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243
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244 int
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245 current_column (struct buffer *buf)
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246 {
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247 if (buf == last_known_column_buffer
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248 && BUF_PT (buf) == last_known_column_point
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249 && BUF_MODIFF (buf) == last_known_column_modified)
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250 return last_known_column;
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251
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252 return column_at_point (buf, BUF_PT (buf), 1);
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253 }
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254
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255 DEFUN ("current-column", Fcurrent_column, 0, 1, 0, /*
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256 Return the horizontal position of point. Beginning of line is column 0.
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257 This is calculated by adding together the widths of all the displayed
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258 representations of the character between the start of the previous line
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259 and point. (e.g. control characters will have a width of 2 or 4, tabs
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260 will have a variable width.)
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261 Ignores finite width of frame, which means that this function may return
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262 values greater than (frame-width).
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263 Whether the line is visible (if `selective-display' is t) has no effect;
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264 however, ^M is treated as end of line when `selective-display' is t.
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265 If BUFFER is nil, the current buffer is assumed.
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266 */
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267 (buffer))
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268 {
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269 return make_int (current_column (decode_buffer (buffer, 0)));
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270 }
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271
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272
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273 DEFUN ("indent-to", Findent_to, 1, 3, "NIndent to column: ", /*
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274 Indent from point with tabs and spaces until COLUMN is reached.
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275 Optional second argument MIN says always do at least MIN spaces
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276 even if that goes past COLUMN; by default, MIN is zero.
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277 If BUFFER is nil, the current buffer is assumed.
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278 */
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279 (col, minimum, buffer))
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280 {
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281 /* This function can GC */
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282 int mincol;
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283 int fromcol;
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284 struct buffer *buf = decode_buffer (buffer, 0);
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285 int tab_width = XINT (buf->tab_width);
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286 Bufpos opoint = 0;
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287
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288 CHECK_INT (col);
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289 if (NILP (minimum))
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290 minimum = Qzero;
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291 else
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292 CHECK_INT (minimum);
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293
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294 XSETBUFFER (buffer, buf);
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295
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296 fromcol = current_column (buf);
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297 mincol = fromcol + XINT (minimum);
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298 if (mincol < XINT (col)) mincol = XINT (col);
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299
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300 if (fromcol == mincol)
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301 return make_int (mincol);
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302
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303 if (tab_width <= 0 || tab_width > 1000) tab_width = 8;
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304
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305 if (!NILP (Fextent_at (make_int (BUF_PT (buf)), buffer, Qinvisible,
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306 Qnil, Qnil)))
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307 {
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308 Bufpos last_visible = last_visible_position (BUF_PT (buf), buf);
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309
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310 opoint = BUF_PT (buf);
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311 if (last_visible >= BUF_BEGV (buf))
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312 BUF_SET_PT (buf, last_visible);
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313 else
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314 error ("Visible portion of buffer not modifiable");
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315 }
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316
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317 if (indent_tabs_mode)
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318 {
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319 int n = mincol / tab_width - fromcol / tab_width;
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320 if (n != 0)
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321 {
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322 Finsert_char (make_char ('\t'), make_int (n), Qnil, buffer);
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323
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324 fromcol = (mincol / tab_width) * tab_width;
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325 }
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326 }
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327
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328 Finsert_char (make_char (' '), make_int (mincol - fromcol), Qnil, buffer);
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329
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330 last_known_column_buffer = buf;
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331 last_known_column = mincol;
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332 last_known_column_point = BUF_PT (buf);
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333 last_known_column_modified = BUF_MODIFF (buf);
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334
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335 /* Not in FSF: */
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336 if (opoint > 0)
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337 BUF_SET_PT (buf, opoint);
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338
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339 return make_int (mincol);
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340 }
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341
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342 int
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343 bi_spaces_at_point (struct buffer *b, Bytind bi_pos)
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344 {
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345 Bytind bi_end = BI_BUF_ZV (b);
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346 int col = 0;
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347 Emchar c;
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348 int tab_width = XINT (b->tab_width);
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349
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350 if (tab_width <= 0 || tab_width > 1000)
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351 tab_width = 8;
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352
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353 while (bi_pos < bi_end &&
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354 (c = BI_BUF_FETCH_CHAR (b, bi_pos),
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355 (c == '\t'
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356 ? (col += tab_width - col % tab_width)
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357 : (c == ' ' ? ++col : 0))))
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358 INC_BYTIND (b, bi_pos);
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359
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360 return col;
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361 }
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362
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363
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364 DEFUN ("current-indentation", Fcurrent_indentation, 0, 1, 0, /*
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365 Return the indentation of the current line.
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366 This is the horizontal position of the character
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367 following any initial whitespace.
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368 */
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369 (buffer))
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370 {
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371 struct buffer *buf = decode_buffer (buffer, 0);
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372 Bufpos pos = find_next_newline (buf, BUF_PT (buf), -1);
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373
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374 XSETBUFFER (buffer, buf);
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375
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376 if (!NILP (Fextent_at (make_int (pos), buffer, Qinvisible, Qnil, Qnil)))
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377 return Qzero;
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378
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379 return make_int (bi_spaces_at_point (buf, bufpos_to_bytind (buf, pos)));
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380 }
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381
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382
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383 DEFUN ("move-to-column", Fmove_to_column, 1, 3, 0, /*
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384 Move point to column COLUMN in the current line.
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385 The column of a character is calculated by adding together the widths
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386 as displayed of the previous characters in the line.
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387 This function ignores line-continuation;
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388 there is no upper limit on the column number a character can have
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389 and horizontal scrolling has no effect.
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390
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391 If specified column is within a character, point goes after that character.
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392 If it's past end of line, point goes to end of line.
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393
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394 A value of 'coerce for the second (optional) argument FORCE means if
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395 COLUMN is in the middle of a tab character, change it to spaces.
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396 Any other non-nil value means the same, plus if the line is too short to
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397 reach column COLUMN, then add spaces/tabs to get there.
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398
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399 Returns the actual column that it moved to.
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400 */
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401 (column, force, buffer))
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402 {
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403 /* This function can GC */
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404 Bufpos pos;
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405 struct buffer *buf = decode_buffer (buffer, 0);
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406 int col = current_column (buf);
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407 int goal;
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408 Bufpos end;
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409 int tab_width = XINT (buf->tab_width);
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410
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411 int prev_col = 0;
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412 Emchar c = 0;
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413
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414 XSETBUFFER (buffer, buf);
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415 if (tab_width <= 0 || tab_width > 1000) tab_width = 8;
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416 CHECK_NATNUM (column);
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417 goal = XINT (column);
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418
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419 retry:
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420 pos = BUF_PT (buf);
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421 end = BUF_ZV (buf);
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422
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|
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423 /* If we're starting past the desired column,
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424 back up to beginning of line and scan from there. */
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|
425 if (col > goal)
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|
|
426 {
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427 pos = find_next_newline (buf, pos, -1);
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|
|
428 col = 0;
|
|
|
429 }
|
|
|
430
|
|
|
431 while (col < goal && pos < end)
|
|
|
432 {
|
|
|
433 c = BUF_FETCH_CHAR (buf, pos);
|
|
|
434 if (c == '\n')
|
|
|
435 break;
|
|
|
436 if (c == '\r' && EQ (buf->selective_display, Qt))
|
|
|
437 break;
|
|
|
438 if (c == '\t')
|
|
|
439 {
|
|
|
440 prev_col = col;
|
|
|
441 col += tab_width;
|
|
|
442 col = col / tab_width * tab_width;
|
|
|
443 }
|
|
|
444 else
|
|
|
445 {
|
|
|
446 /* #### oh for the days of the complete new redisplay */
|
|
|
447 /* #### FSFmacs looks at ctl_arrow, display tables.
|
|
|
448 We need to do similar. */
|
|
|
449 #if 0
|
|
|
450 displayed_glyphs = glyphs_from_bufpos (selected_frame (),
|
|
|
451 buf,
|
|
|
452 XWINDOW (Fselected_window (Qnil)),
|
|
|
453 pos, dp, 0, col, 0, 0, 0);
|
|
|
454 col += (displayed_glyphs->columns
|
|
|
455 - (displayed_glyphs->begin_columns
|
|
|
456 + displayed_glyphs->end_columns));
|
|
|
457 #else /* XEmacs */
|
|
|
458 #ifdef MULE
|
|
|
459 col += XCHARSET_COLUMNS (CHAR_CHARSET (c));
|
|
|
460 #else
|
|
|
461 col ++;
|
|
|
462 #endif /* MULE */
|
|
|
463 #endif /* XEmacs */
|
|
|
464 }
|
|
|
465
|
|
|
466 pos++;
|
|
|
467 }
|
|
|
468
|
|
|
469 BUF_SET_PT (buf, pos);
|
|
|
470
|
|
|
471 /* If a tab char made us overshoot, change it to spaces
|
|
|
472 and scan through it again. */
|
|
|
473 if (!NILP (force) && col > goal && c == '\t' && prev_col < goal)
|
|
|
474 {
|
|
|
475 buffer_delete_range (buf, BUF_PT (buf) - 1, BUF_PT (buf), 0);
|
|
|
476 Findent_to (make_int (col - 1), Qzero, buffer);
|
|
|
477 buffer_insert_emacs_char (buf, ' ');
|
|
|
478 goto retry;
|
|
|
479 }
|
|
|
480
|
|
|
481 /* If line ends prematurely, add space to the end. */
|
|
|
482 if (col < goal && !NILP (force) && !EQ (force, Qcoerce))
|
|
|
483 {
|
|
|
484 col = goal;
|
|
|
485 Findent_to (make_int (col), Qzero, buffer);
|
|
|
486 }
|
|
|
487
|
|
|
488 last_known_column_buffer = buf;
|
|
|
489 last_known_column = col;
|
|
|
490 last_known_column_point = BUF_PT (buf);
|
|
|
491 last_known_column_modified = BUF_MODIFF (buf);
|
|
|
492
|
|
|
493 return make_int (col);
|
|
|
494 }
|
|
|
495
|
|
|
496 #if 0 /* #### OK boys, this function needs to be present, I think.
|
|
|
497 It was there before the 19.12 redisplay rewrite. */
|
|
|
498
|
|
|
499 xxDEFUN ("compute-motion", Fcompute_motion, 7, 7, 0, /*
|
|
|
500 "Scan through the current buffer, calculating screen position.
|
|
|
501 Scan the current buffer forward from offset FROM,
|
|
|
502 assuming it is at position FROMPOS--a cons of the form (HPOS . VPOS)--
|
|
|
503 to position TO or position TOPOS--another cons of the form (HPOS . VPOS)--
|
|
|
504 and return the ending buffer position and screen location.
|
|
|
505
|
|
|
506 There are three additional arguments:
|
|
|
507
|
|
|
508 WIDTH is the number of columns available to display text;
|
|
|
509 this affects handling of continuation lines.
|
|
|
510 This is usually the value returned by `window-width', less one (to allow
|
|
|
511 for the continuation glyph).
|
|
|
512
|
|
|
513 OFFSETS is either nil or a cons cell (HSCROLL . TAB-OFFSET).
|
|
|
514 HSCROLL is the number of columns not being displayed at the left
|
|
|
515 margin; this is usually taken from a window's hscroll member.
|
|
|
516 TAB-OFFSET is the number of columns of the first tab that aren't
|
|
|
517 being displayed, perhaps because the line was continued within it.
|
|
|
518 If OFFSETS is nil, HSCROLL and TAB-OFFSET are assumed to be zero.
|
|
|
519
|
|
|
520 WINDOW is the window to operate on. Currently this is used only to
|
|
|
521 find the display table. It does not matter what buffer WINDOW displays;
|
|
|
522 `compute-motion' always operates on the current buffer.
|
|
|
523
|
|
|
524 The value is a list of five elements:
|
|
|
525 (POS HPOS VPOS PREVHPOS CONTIN)
|
|
|
526 POS is the buffer position where the scan stopped.
|
|
|
527 VPOS is the vertical position where the scan stopped.
|
|
|
528 HPOS is the horizontal position where the scan stopped.
|
|
|
529
|
|
|
530 PREVHPOS is the horizontal position one character back from POS.
|
|
|
531 CONTIN is t if a line was continued after (or within) the previous character.
|
|
|
532
|
|
|
533 For example, to find the buffer position of column COL of line LINE
|
|
|
534 of a certain window, pass the window's starting location as FROM
|
|
|
535 and the window's upper-left coordinates as FROMPOS.
|
|
|
536 Pass the buffer's (point-max) as TO, to limit the scan to the end of the
|
|
|
537 visible section of the buffer, and pass LINE and COL as TOPOS.
|
|
|
538 */
|
|
|
539 (from, frompos, to, topos, width, offsets, window))
|
|
|
540 {
|
|
|
541 Lisp_Object bufpos, hpos, vpos, prevhpos, contin;
|
|
|
542 struct position *pos;
|
|
|
543 int hscroll, tab_offset;
|
|
|
544 struct window *w = decode_window (window);
|
|
|
545
|
|
|
546 CHECK_INT_COERCE_MARKER (from);
|
|
|
547 CHECK_CONS (frompos);
|
|
|
548 CHECK_INT (XCAR (frompos));
|
|
|
549 CHECK_INT (XCDR (frompos));
|
|
|
550 CHECK_INT_COERCE_MARKER (to);
|
|
|
551 CHECK_CONS (topos);
|
|
|
552 CHECK_INT (XCAR (topos));
|
|
|
553 CHECK_INT (XCDR (topos));
|
|
|
554 CHECK_INT (width);
|
|
|
555 if (!NILP (offsets))
|
|
|
556 {
|
|
|
557 CHECK_CONS (offsets);
|
|
|
558 CHECK_INT (XCAR (offsets));
|
|
|
559 CHECK_INT (XCDR (offsets));
|
|
|
560 hscroll = XINT (XCAR (offsets));
|
|
|
561 tab_offset = XINT (XCDR (offsets));
|
|
|
562 }
|
|
|
563 else
|
|
|
564 hscroll = tab_offset = 0;
|
|
|
565
|
|
|
566 pos = compute_motion (XINT (from), XINT (XCDR (frompos)),
|
|
|
567 XINT (XCAR (frompos)),
|
|
|
568 XINT (to), XINT (XCDR (topos)),
|
|
|
569 XINT (XCAR (topos)),
|
|
|
570 XINT (width), hscroll, tab_offset, w);
|
|
|
571
|
|
|
572 XSETINT (bufpos, pos->bufpos);
|
|
|
573 XSETINT (hpos, pos->hpos);
|
|
|
574 XSETINT (vpos, pos->vpos);
|
|
|
575 XSETINT (prevhpos, pos->prevhpos);
|
|
|
576
|
|
|
577 return list5 (bufpos, hpos, vpos, prevhpos,
|
|
|
578 pos->contin ? Qt : Qnil);
|
|
|
579 }
|
|
|
580
|
|
|
581 #endif /* 0 */
|
|
|
582
|
|
|
583 /* Helper for vmotion_1 - compute vertical pixel motion between
|
|
|
584 START and END in the line start cache CACHE. This just sums
|
|
|
585 the line heights, including both the starting and ending lines.
|
|
|
586 */
|
|
|
587 static int
|
|
|
588 vpix_motion (line_start_cache_dynarr *cache, int start, int end)
|
|
|
589 {
|
|
|
590 int i, vpix;
|
|
|
591
|
|
|
592 assert (start <= end);
|
|
|
593 assert (start >= 0);
|
|
|
594 assert (end < Dynarr_length (cache));
|
|
|
595
|
|
|
596 vpix = 0;
|
|
|
597 for (i = start; i <= end; i++)
|
|
|
598 vpix += Dynarr_atp (cache, i)->height;
|
|
|
599
|
|
|
600 return vpix;
|
|
|
601 }
|
|
|
602
|
|
|
603 /*****************************************************************************
|
|
|
604 vmotion_1
|
|
|
605
|
|
|
606 Given a starting position ORIG, move point VTARGET lines in WINDOW.
|
|
|
607 Returns the new value for point. If the arg ret_vpos is not nil, it is
|
|
|
608 taken to be a pointer to an int and the number of lines actually moved is
|
|
|
609 returned in it. If the arg ret_vpix is not nil, it is taken to be a
|
|
|
610 pointer to an int and the vertical pixel height of the motion which
|
|
|
611 took place is returned in it.
|
|
|
612 ****************************************************************************/
|
|
|
613 static Bufpos
|
|
|
614 vmotion_1 (struct window *w, Bufpos orig, int vtarget,
|
|
|
615 int *ret_vpos, int *ret_vpix)
|
|
|
616 {
|
|
|
617 struct buffer *b = XBUFFER (w->buffer);
|
|
|
618 int elt;
|
|
|
619
|
|
|
620 elt = point_in_line_start_cache (w, orig, (vtarget < 0
|
|
|
621 ? -vtarget
|
|
|
622 : vtarget));
|
|
|
623
|
|
|
624 /* #### This assertion must be true before the if statements are hit
|
|
|
625 but may possibly be wrong after the call to
|
|
|
626 point_in_line_start_cache if orig is outside of the visible
|
|
|
627 region of the buffer. Handle this. */
|
|
|
628 assert (elt >= 0);
|
|
|
629
|
|
|
630 /* Moving downward. */
|
|
|
631 if (vtarget > 0)
|
|
|
632 {
|
|
|
633 int cur_line = Dynarr_length (w->line_start_cache) - 1 - elt;
|
|
|
634 Bufpos ret_pt;
|
|
|
635
|
|
|
636 if (cur_line > vtarget)
|
|
|
637 cur_line = vtarget;
|
|
|
638
|
|
|
639 /* The traditional FSF behavior is to return the end of buffer
|
|
|
640 position if we couldn't move far enough because we hit it. */
|
|
|
641 if (cur_line < vtarget)
|
|
|
642 ret_pt = BUF_ZV (b);
|
|
|
643 else
|
|
|
644 ret_pt = Dynarr_atp (w->line_start_cache, cur_line + elt)->start;
|
|
|
645
|
|
|
646 while (ret_pt > BUF_ZV (b) && cur_line > 0)
|
|
|
647 {
|
|
|
648 cur_line--;
|
|
|
649 ret_pt = Dynarr_atp (w->line_start_cache, cur_line + elt)->start;
|
|
|
650 }
|
|
|
651
|
|
|
652 if (ret_vpos) *ret_vpos = cur_line;
|
|
|
653 if (ret_vpix)
|
|
|
654 *ret_vpix = vpix_motion (w->line_start_cache, elt, cur_line + elt);
|
|
|
655 return ret_pt;
|
|
|
656 }
|
|
|
657 else if (vtarget < 0)
|
|
|
658 {
|
|
|
659 if (elt < -vtarget)
|
|
|
660 {
|
|
|
661 if (ret_vpos) *ret_vpos = -elt;
|
|
|
662 if (ret_vpix)
|
|
|
663 *ret_vpix = vpix_motion (w->line_start_cache, 0, elt);
|
|
|
664 /* #### This should be BUF_BEGV (b), right? */
|
|
|
665 return Dynarr_atp (w->line_start_cache, 0)->start;
|
|
|
666 }
|
|
|
667 else
|
|
|
668 {
|
|
|
669 if (ret_vpos) *ret_vpos = vtarget;
|
|
|
670 if (ret_vpix)
|
|
|
671 *ret_vpix = vpix_motion (w->line_start_cache, elt + vtarget, elt);
|
|
|
672 return Dynarr_atp (w->line_start_cache, elt + vtarget)->start;
|
|
|
673 }
|
|
|
674 }
|
|
|
675 else
|
|
|
676 {
|
|
|
677 /* No vertical motion requested so we just return the position
|
|
|
678 of the beginning of the current line. */
|
|
|
679 if (ret_vpos) *ret_vpos = 0;
|
|
|
680 if (ret_vpix)
|
|
|
681 *ret_vpix = vpix_motion (w->line_start_cache, elt, elt);
|
|
|
682
|
|
|
683 return Dynarr_atp (w->line_start_cache, elt)->start;
|
|
|
684 }
|
|
|
685
|
|
|
686 RETURN_NOT_REACHED(0) /* shut up compiler */
|
|
|
687 }
|
|
|
688
|
|
|
689 /*****************************************************************************
|
|
|
690 vmotion
|
|
|
691
|
|
|
692 Given a starting position ORIG, move point VTARGET lines in WINDOW.
|
|
|
693 Returns the new value for point. If the arg ret_vpos is not nil, it is
|
|
|
694 taken to be a pointer to an int and the number of lines actually moved is
|
|
|
695 returned in it.
|
|
|
696 ****************************************************************************/
|
|
|
697 Bufpos
|
|
|
698 vmotion (struct window *w, Bufpos orig, int vtarget, int *ret_vpos)
|
|
|
699 {
|
|
|
700 return vmotion_1 (w, orig, vtarget, ret_vpos, NULL);
|
|
|
701 }
|
|
|
702
|
|
|
703 /* Helper for Fvertical_motion.
|
|
|
704 */
|
|
|
705 static
|
|
|
706 Lisp_Object vertical_motion_1 (Lisp_Object lines, Lisp_Object window,
|
|
|
707 int pixels)
|
|
|
708 {
|
|
|
709 Bufpos bufpos;
|
|
|
710 Bufpos orig;
|
|
|
711 int selected;
|
|
|
712 int *vpos, *vpix;
|
|
|
713 int value=0;
|
|
|
714 struct window *w;
|
|
|
715
|
|
|
716 if (NILP (window))
|
|
|
717 window = Fselected_window (Qnil);
|
|
|
718
|
|
|
719 CHECK_LIVE_WINDOW (window);
|
|
|
720 CHECK_INT (lines);
|
|
|
721
|
|
|
722 selected = (EQ (window, Fselected_window (Qnil)));
|
|
|
723
|
|
|
724 w = XWINDOW (window);
|
|
|
725
|
|
|
726 orig = selected ? BUF_PT (XBUFFER (w->buffer))
|
|
|
727 : marker_position (w->pointm[CURRENT_DISP]);
|
|
|
728
|
|
|
729 vpos = pixels ? NULL : &value;
|
|
|
730 vpix = pixels ? &value : NULL;
|
|
|
731
|
|
|
732 bufpos = vmotion_1 (w, orig, XINT (lines), vpos, vpix);
|
|
|
733
|
|
|
734 /* Note that the buffer's point is set, not the window's point. */
|
|
|
735 if (selected)
|
|
|
736 BUF_SET_PT (XBUFFER (w->buffer), bufpos);
|
|
|
737 else
|
|
|
738 set_marker_restricted (w->pointm[CURRENT_DISP],
|
|
|
739 make_int(bufpos),
|
|
|
740 w->buffer);
|
|
|
741
|
|
|
742 return make_int (value);
|
|
|
743 }
|
|
|
744
|
|
|
745 DEFUN ("vertical-motion", Fvertical_motion, 1, 3, 0, /*
|
|
|
746 Move to start of frame line LINES lines down.
|
|
|
747 If LINES is negative, this is moving up.
|
|
|
748 Optional second argument is WINDOW to move in,
|
|
|
749 the default is the selected window.
|
|
|
750
|
|
|
751 Sets point to position found; this may be start of line
|
|
|
752 or just the start of a continuation line.
|
|
|
753 If optional third argument PIXELS is nil, returns number
|
|
|
754 of lines moved; may be closer to zero than LINES if beginning
|
|
|
755 or end of buffer was reached. If PIXELS is non-nil, the
|
|
|
756 vertical pixel height of the motion which took place is
|
|
|
757 returned instead of the actual number of lines moved. A
|
|
|
758 motion of zero lines returns the height of the current line.
|
|
|
759
|
|
|
760 Note that `vertical-motion' sets WINDOW's buffer's point, not
|
|
|
761 WINDOW's point. (This differs from FSF Emacs, which buggily always
|
|
|
762 sets current buffer's point, regardless of WINDOW.)
|
|
|
763 */
|
|
|
764 (lines, window, pixels))
|
|
|
765 {
|
|
|
766 return vertical_motion_1 (lines, window, !NILP (pixels));
|
|
|
767 }
|
|
|
768
|
|
|
769 /*
|
|
|
770 * Like vmotion() but requested and returned movement is in pixels.
|
|
|
771 * HOW specifies the stopping condition. Positive means move at least
|
|
|
772 * PIXELS. Negative means at most. Zero means as close as possible.
|
|
|
773 */
|
|
|
774 Bufpos
|
|
|
775 vmotion_pixels (Lisp_Object window, Bufpos start, int pixels, int how,
|
|
|
776 int *motion)
|
|
|
777 {
|
|
|
778 struct window *w;
|
|
|
779 Bufpos eobuf, bobuf;
|
|
|
780 int defheight;
|
|
|
781 int needed;
|
|
|
782 int line, next;
|
|
|
783 int remain, abspix, dirn;
|
|
|
784 int elt, nelt;
|
|
|
785 int i;
|
|
|
786 line_start_cache_dynarr *cache;
|
|
|
787 int previous = -1;
|
|
|
788 int lines;
|
|
|
789
|
|
|
790 if (NILP (window))
|
|
|
791 window = Fselected_window (Qnil);
|
|
|
792
|
|
|
793 CHECK_LIVE_WINDOW (window);
|
|
|
794 w = XWINDOW (window);
|
|
|
795
|
|
|
796 eobuf = BUF_ZV (XBUFFER (w->buffer));
|
|
|
797 bobuf = BUF_BEGV (XBUFFER (w->buffer));
|
|
|
798
|
|
|
799 default_face_height_and_width (window, &defheight, NULL);
|
|
|
800
|
|
|
801 /* guess num lines needed in line start cache + a few extra */
|
|
|
802 abspix = abs (pixels);
|
|
|
803 needed = (abspix + defheight-1)/defheight + 3;
|
|
|
804
|
|
|
805 dirn = (pixels >= 0) ? 1 : -1;
|
|
|
806
|
|
|
807 while (1)
|
|
|
808 {
|
|
|
809 elt = point_in_line_start_cache (w, start, needed);
|
|
|
810 assert (elt >= 0); /* in the cache */
|
|
|
811
|
|
|
812 cache = w->line_start_cache;
|
|
|
813 nelt = Dynarr_length (cache);
|
|
|
814
|
|
|
815 *motion = 0;
|
|
|
816
|
|
|
817 if (pixels == 0)
|
|
|
818 /* No vertical motion requested so we just return the position
|
|
|
819 of the beginning of the current display line. */
|
|
|
820 return Dynarr_atp (cache, elt)->start;
|
|
|
821
|
|
|
822 if ((dirn < 0 && elt == 0 &&
|
|
|
823 Dynarr_atp (cache, elt)->start <= bobuf) ||
|
|
|
824 (dirn > 0 && elt == nelt-1 &&
|
|
|
825 Dynarr_atp (cache, elt)->end >= eobuf))
|
|
|
826 return Dynarr_atp (cache, elt)->start;
|
|
|
827
|
|
|
828 remain = abspix;
|
|
|
829 for (i = elt; (dirn > 0) ? (i < nelt) : (i > 0); i += dirn)
|
|
|
830 {
|
|
|
831 /* cache line we're considering moving over */
|
|
|
832 int ii = (dirn > 0) ? i : i-1;
|
|
|
833
|
|
|
834 if (remain < 0)
|
|
|
835 return Dynarr_atp (cache, i)->start;
|
|
|
836
|
|
|
837 line = Dynarr_atp (cache, ii)->height;
|
|
|
838 next = remain - line;
|
|
|
839
|
|
|
840 /* is stopping condition satisfied? */
|
|
|
841 if ((how > 0 && remain <= 0) || /* at least */
|
|
|
842 (how < 0 && next < 0) || /* at most */
|
|
|
843 (how == 0 && remain <= abs (next))) /* closest */
|
|
|
844 return Dynarr_atp (cache, i)->start;
|
|
|
845
|
|
|
846 /* moving down and nowhere left to go? */
|
|
|
847 if (dirn > 0 && Dynarr_atp (cache, ii)->end >= eobuf)
|
|
|
848 return Dynarr_atp (cache, ii)->start;
|
|
|
849
|
|
|
850 /* take the step */
|
|
|
851 remain = next;
|
|
|
852 *motion += dirn * line;
|
|
|
853
|
|
|
854 /* moving up and nowhere left to go? */
|
|
|
855 if (dirn < 0 && Dynarr_atp (cache, ii)->start <= bobuf)
|
|
|
856 return Dynarr_atp (cache, ii)->start;
|
|
|
857 }
|
|
|
858
|
|
|
859 /* get here => need more cache lines. try again. */
|
|
|
860 assert (abs (*motion) > previous); /* progress? */
|
|
|
861 previous = abs (*motion);
|
|
|
862
|
|
|
863 lines = (pixels < 0) ? elt : (nelt - elt);
|
|
|
864 needed += (remain*lines + abspix-1)/abspix + 3;
|
|
|
865 }
|
|
|
866
|
|
|
867 RETURN_NOT_REACHED(0) /* shut up compiler */
|
|
|
868 }
|
|
|
869
|
|
|
870 DEFUN ("vertical-motion-pixels", Fvertical_motion_pixels, 1, 3, 0, /*
|
|
|
871 Move to start of frame line PIXELS vertical pixels down.
|
|
|
872 If PIXELS is negative, this is moving up.
|
|
|
873 The actual vertical motion in pixels is returned.
|
|
|
874
|
|
|
875 Optional second argument is WINDOW to move in,
|
|
|
876 the default is the selected window.
|
|
|
877
|
|
|
878 Optional third argument HOW specifies when to stop. A value
|
|
|
879 less than zero indicates that the motion should be no more
|
|
|
880 than PIXELS. A value greater than zero indicates that the
|
|
|
881 motion should be at least PIXELS. Any other value indicates
|
|
|
882 that the motion should be as close as possible to PIXELS.
|
|
|
883 */
|
|
|
884 (pixels, window, how))
|
|
|
885 {
|
|
|
886 Bufpos bufpos;
|
|
|
887 Bufpos orig;
|
|
|
888 int selected;
|
|
|
889 int motion;
|
|
|
890 int howto;
|
|
|
891 struct window *w;
|
|
|
892
|
|
|
893 if (NILP (window))
|
|
|
894 window = Fselected_window (Qnil);
|
|
|
895
|
|
|
896 CHECK_LIVE_WINDOW (window);
|
|
|
897 CHECK_INT (pixels);
|
|
|
898
|
|
|
899 selected = (EQ (window, Fselected_window (Qnil)));
|
|
|
900
|
|
|
901 w = XWINDOW (window);
|
|
|
902
|
|
|
903 orig = selected ? BUF_PT (XBUFFER (w->buffer))
|
|
|
904 : marker_position (w->pointm[CURRENT_DISP]);
|
|
|
905
|
|
|
906 howto = INTP (how) ? XINT (how) : 0;
|
|
|
907
|
|
|
908 bufpos = vmotion_pixels (window, orig, XINT (pixels), howto, &motion);
|
|
|
909
|
|
|
910 if (selected)
|
|
|
911 BUF_SET_PT (XBUFFER (w->buffer), bufpos);
|
|
|
912 else
|
|
|
913 set_marker_restricted (w->pointm[CURRENT_DISP],
|
|
|
914 make_int(bufpos),
|
|
|
915 w->buffer);
|
|
|
916
|
|
|
917 return make_int (motion);
|
|
|
918 }
|
|
|
919
|
|
|
920
|
|
|
921 void
|
|
|
922 syms_of_indent (void)
|
|
|
923 {
|
|
|
924 DEFSUBR (Fcurrent_indentation);
|
|
|
925 DEFSUBR (Findent_to);
|
|
|
926 DEFSUBR (Fcurrent_column);
|
|
|
927 DEFSUBR (Fmove_to_column);
|
|
|
928 #if 0 /* #### */
|
|
|
929 DEFSUBR (Fcompute_motion);
|
|
|
930 #endif
|
|
|
931 DEFSUBR (Fvertical_motion);
|
|
|
932 DEFSUBR (Fvertical_motion_pixels);
|
|
|
933
|
|
|
934 defsymbol (&Qcoerce, "coerce");
|
|
|
935 }
|
|
|
936
|
|
|
937 void
|
|
|
938 vars_of_indent (void)
|
|
|
939 {
|
|
|
940 DEFVAR_BOOL ("indent-tabs-mode", &indent_tabs_mode /*
|
|
|
941 *Indentation can insert tabs if this is non-nil.
|
|
|
942 Setting this variable automatically makes it local to the current buffer.
|
|
|
943 */ );
|
|
|
944 indent_tabs_mode = 1;
|
|
|
945 }
|
