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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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826
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4 Free Software Foundation, Inc.
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3025
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5 Copyright (C) 2002, 2005 Ben Wing.
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428
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6
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7 This file is part of XEmacs.
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8
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9 XEmacs is free software; you can redistribute it and/or modify it
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10 under the terms of the GNU General Public License as published by the
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11 Free Software Foundation; either version 2, or (at your option) any
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12 later version.
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13
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14 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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17 for more details.
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18
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19 You should have received a copy of the GNU General Public License
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20 along with XEmacs; see the file COPYING. If not, write to
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21 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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22 Boston, MA 02111-1307, USA. */
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23
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24 /* This file has been Mule-ized. */
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25
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26 /* Synched up with: 19.30. Diverges significantly from FSF. */
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27
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28
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29 #include <config.h>
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30 #include "lisp.h"
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31
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32 #include "buffer.h"
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33 #include "device.h"
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34 #include "extents.h"
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35 #include "faces.h"
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36 #include "frame.h"
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37 #include "glyphs.h"
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38 #include "insdel.h"
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39 #ifdef REGION_CACHE_NEEDS_WORK
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40 #include "region-cache.h"
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41 #endif
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42 #include "window.h"
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43
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44 /* Indentation can insert tabs if this is non-zero;
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45 otherwise always uses spaces */
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46 int indent_tabs_mode;
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47
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48 /* Avoid recalculation by remembering things in these variables. */
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49
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50 /* Last value returned by current_column.
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51
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52 Some things set last_known_column_point to -1
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53 to mark the memoized value as invalid */
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54 static int last_known_column;
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55
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56 /* Last buffer searched by current_column */
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57 static struct buffer *last_known_column_buffer;
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58
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59 /* Value of point when current_column was called */
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665
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60 static Charbpos last_known_column_point;
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428
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61
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62 /* Value of MODIFF when current_column was called */
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63 static int last_known_column_modified;
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64
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665
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65 static Charbpos
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66 last_visible_position (Charbpos pos, struct buffer *buf)
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428
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67 {
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68 Lisp_Object buffer;
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69 Lisp_Object value;
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70
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793
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71 buffer = wrap_buffer (buf);
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2506
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72 value = Fprevious_single_char_property_change (make_int (pos), Qinvisible,
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73 buffer, Qnil);
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428
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74 if (NILP (value))
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75 return 0; /* no visible position found */
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76 else
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77 /* #### bug bug bug!!! This will return the position of the beginning
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78 of an invisible extent; this extent is very likely to be start-closed,
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79 and thus the spaces inserted in `indent-to' will go inside the
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80 invisible extent.
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81
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82 Not sure what the correct solution is here. Rethink indent-to? */
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83 return XINT (value);
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84 }
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85
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86 #ifdef REGION_CACHE_NEEDS_WORK
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87
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88 /* Allocate or free the width run cache, as requested by the current
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89 state of current_buffer's cache_long_line_scans variable. */
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90 static void
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91 width_run_cache_on_off (struct buffer *buf)
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92 {
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93 if (NILP (buf->cache_long_line_scans))
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94 {
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95 /* It should be off. */
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96 if (buf->width_run_cache)
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97 {
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98 free_region_cache (buf->width_run_cache);
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99 buf->width_run_cache = 0;
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100 buf->width_table = Qnil;
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101 }
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102 }
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103 else
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104 {
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105 /* It should be on. */
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106 if (buf->width_run_cache == 0)
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107 {
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108 buf->width_run_cache = new_region_cache ();
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109 recompute_width_table (buf, buffer_display_table ());
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110 }
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111 }
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112 }
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113
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114 #endif /* REGION_CACHE_NEEDS_WORK */
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115
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116
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117 /* Cancel any recorded value of the horizontal position. */
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118
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119 void
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120 invalidate_current_column (void)
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121 {
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122 last_known_column_point = -1;
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123 }
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124
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125 int
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665
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126 column_at_point (struct buffer *buf, Charbpos init_pos, int cur_col)
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428
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127 {
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128 int col;
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129 int tab_seen;
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130 int tab_width = XINT (buf->tab_width);
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131 int post_tab;
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665
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132 Charbpos pos = init_pos;
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867
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133 Ichar c;
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428
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134
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135 if (tab_width <= 0 || tab_width > 1000) tab_width = 8;
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136 col = tab_seen = post_tab = 0;
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137
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138 while (1)
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139 {
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140 if (pos <= BUF_BEGV (buf))
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141 break;
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142
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143 pos--;
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144 c = BUF_FETCH_CHAR (buf, pos);
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145 if (c == '\t')
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146 {
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147 if (tab_seen)
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148 col = ((col + tab_width) / tab_width) * tab_width;
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149
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150 post_tab += col;
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151 col = 0;
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152 tab_seen = 1;
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153 }
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154 else if (c == '\n' ||
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155 (EQ (buf->selective_display, Qt) && c == '\r'))
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156 break;
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157 else
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158 {
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159 /* #### This needs updating to handle the new redisplay. */
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160 /* #### FSFmacs looks at ctl_arrow, display tables.
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161 We need to do similar. */
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162 #if 0
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665
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163 displayed_glyphs = glyphs_from_charbpos (sel_frame, buf,
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428
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164 XWINDOW (selected_window),
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165 pos, dp, 0, col, 0, 0, 0);
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166 col += (displayed_glyphs->columns
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167 - (displayed_glyphs->begin_columns
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168 + displayed_glyphs->end_columns));
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169 #else /* XEmacs */
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170 #ifdef MULE
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867
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171 col += XCHARSET_COLUMNS (ichar_charset (c));
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428
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172 #else
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173 col ++;
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174 #endif /* MULE */
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175 #endif /* XEmacs */
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176 }
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177 }
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178
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179 if (tab_seen)
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180 {
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181 col = ((col + tab_width) / tab_width) * tab_width;
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182 col += post_tab;
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183 }
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184
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185 if (cur_col)
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186 {
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187 last_known_column_buffer = buf;
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188 last_known_column = col;
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189 last_known_column_point = init_pos;
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190 last_known_column_modified = BUF_MODIFF (buf);
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191 }
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192
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193 return col;
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194 }
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195
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196 int
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793
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197 string_column_at_point (Lisp_Object s, Charbpos init_pos, int tab_width)
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428
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198 {
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199 int col;
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200 int tab_seen;
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201 int post_tab;
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665
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202 Charbpos pos = init_pos;
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867
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203 Ichar c;
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428
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204
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205 if (tab_width <= 0 || tab_width > 1000) tab_width = 8;
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206 col = tab_seen = post_tab = 0;
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207
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208 while (1)
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209 {
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210 if (pos <= 0)
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211 break;
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212
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213 pos--;
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867
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214 c = string_ichar (s, pos);
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428
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215 if (c == '\t')
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216 {
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217 if (tab_seen)
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218 col = ((col + tab_width) / tab_width) * tab_width;
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219
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220 post_tab += col;
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221 col = 0;
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222 tab_seen = 1;
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223 }
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224 else if (c == '\n')
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225 break;
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226 else
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227 #ifdef MULE
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867
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228 col += XCHARSET_COLUMNS (ichar_charset (c));
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428
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229 #else
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230 col ++;
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231 #endif /* MULE */
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232 }
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233
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234 if (tab_seen)
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235 {
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236 col = ((col + tab_width) / tab_width) * tab_width;
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237 col += post_tab;
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238 }
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239
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240 return col;
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241 }
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242
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243 int
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244 current_column (struct buffer *buf)
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245 {
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246 if (buf == last_known_column_buffer
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247 && BUF_PT (buf) == last_known_column_point
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248 && BUF_MODIFF (buf) == last_known_column_modified)
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249 return last_known_column;
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250
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251 return column_at_point (buf, BUF_PT (buf), 1);
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252 }
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253
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254 DEFUN ("current-column", Fcurrent_column, 0, 1, 0, /*
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255 Return the horizontal position of point. Beginning of line is column 0.
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256 This is calculated by adding together the widths of all the displayed
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257 representations of the character between the start of the previous line
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258 and point. (e.g. control characters will have a width of 2 or 4, tabs
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259 will have a variable width.)
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260 Ignores finite width of frame, which means that this function may return
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261 values greater than (frame-width).
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262 Whether the line is visible (if `selective-display' is t) has no effect;
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263 however, ^M is treated as end of line when `selective-display' is t.
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264 If BUFFER is nil, the current buffer is assumed.
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265 */
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266 (buffer))
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267 {
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268 return make_int (current_column (decode_buffer (buffer, 0)));
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269 }
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270
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271
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272 DEFUN ("indent-to", Findent_to, 1, 3, "NIndent to column: ", /*
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273 Indent from point with tabs and spaces until COLUMN is reached.
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444
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274 Optional second argument MINIMUM says always do at least MINIMUM spaces
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275 even if that goes past COLUMN; by default, MINIMUM is zero.
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428
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276 If BUFFER is nil, the current buffer is assumed.
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277 */
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444
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278 (column, minimum, buffer))
|
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428
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279 {
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280 /* This function can GC */
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281 int mincol;
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282 int fromcol;
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283 struct buffer *buf = decode_buffer (buffer, 0);
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284 int tab_width = XINT (buf->tab_width);
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665
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285 Charbpos opoint = 0;
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428
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286
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444
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287 CHECK_INT (column);
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428
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288 if (NILP (minimum))
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289 minimum = Qzero;
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290 else
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291 CHECK_INT (minimum);
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292
|
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793
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293 buffer = wrap_buffer (buf);
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|
428
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294
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295 fromcol = current_column (buf);
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296 mincol = fromcol + XINT (minimum);
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444
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297 if (mincol < XINT (column)) mincol = XINT (column);
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428
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298
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299 if (fromcol == mincol)
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300 return make_int (mincol);
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301
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302 if (tab_width <= 0 || tab_width > 1000) tab_width = 8;
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303
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|
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304 if (!NILP (Fextent_at (make_int (BUF_PT (buf)), buffer, Qinvisible,
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305 Qnil, Qnil)))
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306 {
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665
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307 Charbpos last_visible = last_visible_position (BUF_PT (buf), buf);
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428
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308
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309 opoint = BUF_PT (buf);
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310 if (last_visible >= BUF_BEGV (buf))
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311 BUF_SET_PT (buf, last_visible);
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312 else
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563
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313 invalid_operation ("Visible portion of buffer not modifiable", Qunbound);
|
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428
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314 }
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315
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|
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316 if (indent_tabs_mode)
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|
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317 {
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318 int n = mincol / tab_width - fromcol / tab_width;
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319 if (n != 0)
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320 {
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321 Finsert_char (make_char ('\t'), make_int (n), Qnil, buffer);
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322
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323 fromcol = (mincol / tab_width) * tab_width;
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324 }
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325 }
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326
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327 Finsert_char (make_char (' '), make_int (mincol - fromcol), Qnil, buffer);
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328
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329 last_known_column_buffer = buf;
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330 last_known_column = mincol;
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331 last_known_column_point = BUF_PT (buf);
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332 last_known_column_modified = BUF_MODIFF (buf);
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333
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334 /* Not in FSF: */
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335 if (opoint > 0)
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336 BUF_SET_PT (buf, opoint);
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337
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338 return make_int (mincol);
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339 }
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340
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|
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341 int
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|
826
|
342 byte_spaces_at_point (struct buffer *b, Bytebpos byte_pos)
|
|
428
|
343 {
|
|
826
|
344 Bytebpos byte_end = BYTE_BUF_ZV (b);
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|
428
|
345 int col = 0;
|
|
867
|
346 Ichar c;
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|
428
|
347 int tab_width = XINT (b->tab_width);
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|
|
348
|
|
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349 if (tab_width <= 0 || tab_width > 1000)
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350 tab_width = 8;
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351
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|
826
|
352 while (byte_pos < byte_end &&
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353 (c = BYTE_BUF_FETCH_CHAR (b, byte_pos),
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428
|
354 (c == '\t'
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|
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355 ? (col += tab_width - col % tab_width)
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|
|
356 : (c == ' ' ? ++col : 0))))
|
|
826
|
357 INC_BYTEBPOS (b, byte_pos);
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|
428
|
358
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|
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359 return col;
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|
|
360 }
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|
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361
|
|
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362
|
|
|
363 DEFUN ("current-indentation", Fcurrent_indentation, 0, 1, 0, /*
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|
|
364 Return the indentation of the current line.
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|
|
365 This is the horizontal position of the character
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|
|
366 following any initial whitespace.
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|
|
367 */
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|
|
368 (buffer))
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|
|
369 {
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|
|
370 struct buffer *buf = decode_buffer (buffer, 0);
|
|
665
|
371 Charbpos pos = find_next_newline (buf, BUF_PT (buf), -1);
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|
428
|
372
|
|
793
|
373 buffer = wrap_buffer (buf);
|
|
428
|
374
|
|
|
375 if (!NILP (Fextent_at (make_int (pos), buffer, Qinvisible, Qnil, Qnil)))
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|
|
376 return Qzero;
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|
|
377
|
|
826
|
378 return make_int (byte_spaces_at_point (buf, charbpos_to_bytebpos (buf, pos)));
|
|
428
|
379 }
|
|
|
380
|
|
|
381
|
|
|
382 DEFUN ("move-to-column", Fmove_to_column, 1, 3, 0, /*
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|
|
383 Move point to column COLUMN in the current line.
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|
|
384 The column of a character is calculated by adding together the widths
|
|
|
385 as displayed of the previous characters in the line.
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|
|
386 This function ignores line-continuation;
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|
|
387 there is no upper limit on the column number a character can have
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|
|
388 and horizontal scrolling has no effect.
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|
|
389
|
|
|
390 If specified column is within a character, point goes after that character.
|
|
|
391 If it's past end of line, point goes to end of line.
|
|
|
392
|
|
3025
|
393 A value of `coerce' for the second (optional) argument FORCE means if
|
|
428
|
394 COLUMN is in the middle of a tab character, change it to spaces.
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|
|
395 Any other non-nil value means the same, plus if the line is too short to
|
|
|
396 reach column COLUMN, then add spaces/tabs to get there.
|
|
|
397
|
|
|
398 Returns the actual column that it moved to.
|
|
|
399 */
|
|
|
400 (column, force, buffer))
|
|
|
401 {
|
|
|
402 /* This function can GC */
|
|
665
|
403 Charbpos pos;
|
|
428
|
404 struct buffer *buf = decode_buffer (buffer, 0);
|
|
|
405 int col = current_column (buf);
|
|
|
406 int goal;
|
|
665
|
407 Charbpos end;
|
|
428
|
408 int tab_width = XINT (buf->tab_width);
|
|
|
409
|
|
|
410 int prev_col = 0;
|
|
867
|
411 Ichar c = 0;
|
|
428
|
412
|
|
793
|
413 buffer = wrap_buffer (buf);
|
|
428
|
414 if (tab_width <= 0 || tab_width > 1000) tab_width = 8;
|
|
|
415 CHECK_NATNUM (column);
|
|
|
416 goal = XINT (column);
|
|
|
417
|
|
|
418 retry:
|
|
|
419 pos = BUF_PT (buf);
|
|
|
420 end = BUF_ZV (buf);
|
|
|
421
|
|
|
422 /* If we're starting past the desired column,
|
|
|
423 back up to beginning of line and scan from there. */
|
|
|
424 if (col > goal)
|
|
|
425 {
|
|
|
426 pos = find_next_newline (buf, pos, -1);
|
|
|
427 col = 0;
|
|
|
428 }
|
|
|
429
|
|
|
430 while (col < goal && pos < end)
|
|
|
431 {
|
|
|
432 c = BUF_FETCH_CHAR (buf, pos);
|
|
|
433 if (c == '\n')
|
|
|
434 break;
|
|
|
435 if (c == '\r' && EQ (buf->selective_display, Qt))
|
|
|
436 break;
|
|
|
437 if (c == '\t')
|
|
|
438 {
|
|
|
439 prev_col = col;
|
|
|
440 col += tab_width;
|
|
|
441 col = col / tab_width * tab_width;
|
|
|
442 }
|
|
|
443 else
|
|
|
444 {
|
|
|
445 /* #### oh for the days of the complete new redisplay */
|
|
|
446 /* #### FSFmacs looks at ctl_arrow, display tables.
|
|
|
447 We need to do similar. */
|
|
|
448 #if 0
|
|
665
|
449 displayed_glyphs = glyphs_from_charbpos (selected_frame (),
|
|
428
|
450 buf,
|
|
|
451 XWINDOW (Fselected_window (Qnil)),
|
|
|
452 pos, dp, 0, col, 0, 0, 0);
|
|
|
453 col += (displayed_glyphs->columns
|
|
|
454 - (displayed_glyphs->begin_columns
|
|
|
455 + displayed_glyphs->end_columns));
|
|
|
456 #else /* XEmacs */
|
|
|
457 #ifdef MULE
|
|
867
|
458 col += XCHARSET_COLUMNS (ichar_charset (c));
|
|
428
|
459 #else
|
|
|
460 col ++;
|
|
|
461 #endif /* MULE */
|
|
|
462 #endif /* XEmacs */
|
|
|
463 }
|
|
|
464
|
|
|
465 pos++;
|
|
|
466 }
|
|
|
467
|
|
|
468 BUF_SET_PT (buf, pos);
|
|
|
469
|
|
|
470 /* If a tab char made us overshoot, change it to spaces
|
|
|
471 and scan through it again. */
|
|
|
472 if (!NILP (force) && col > goal && c == '\t' && prev_col < goal)
|
|
|
473 {
|
|
|
474 buffer_delete_range (buf, BUF_PT (buf) - 1, BUF_PT (buf), 0);
|
|
|
475 Findent_to (make_int (col - 1), Qzero, buffer);
|
|
|
476 buffer_insert_emacs_char (buf, ' ');
|
|
|
477 goto retry;
|
|
|
478 }
|
|
|
479
|
|
|
480 /* If line ends prematurely, add space to the end. */
|
|
|
481 if (col < goal && !NILP (force) && !EQ (force, Qcoerce))
|
|
|
482 {
|
|
|
483 col = goal;
|
|
|
484 Findent_to (make_int (col), Qzero, buffer);
|
|
|
485 }
|
|
|
486
|
|
|
487 last_known_column_buffer = buf;
|
|
|
488 last_known_column = col;
|
|
|
489 last_known_column_point = BUF_PT (buf);
|
|
|
490 last_known_column_modified = BUF_MODIFF (buf);
|
|
|
491
|
|
|
492 return make_int (col);
|
|
|
493 }
|
|
|
494
|
|
|
495 #if 0 /* #### OK boys, this function needs to be present, I think.
|
|
|
496 It was there before the 19.12 redisplay rewrite. */
|
|
|
497
|
|
826
|
498 DEFUN ("compute-motion", Fcompute_motion, 7, 7, 0, /*
|
|
428
|
499 "Scan through the current buffer, calculating screen position.
|
|
|
500 Scan the current buffer forward from offset FROM,
|
|
|
501 assuming it is at position FROMPOS--a cons of the form (HPOS . VPOS)--
|
|
|
502 to position TO or position TOPOS--another cons of the form (HPOS . VPOS)--
|
|
|
503 and return the ending buffer position and screen location.
|
|
|
504
|
|
|
505 There are three additional arguments:
|
|
|
506
|
|
|
507 WIDTH is the number of columns available to display text;
|
|
|
508 this affects handling of continuation lines.
|
|
|
509 This is usually the value returned by `window-width', less one (to allow
|
|
|
510 for the continuation glyph).
|
|
|
511
|
|
|
512 OFFSETS is either nil or a cons cell (HSCROLL . TAB-OFFSET).
|
|
|
513 HSCROLL is the number of columns not being displayed at the left
|
|
|
514 margin; this is usually taken from a window's hscroll member.
|
|
|
515 TAB-OFFSET is the number of columns of the first tab that aren't
|
|
|
516 being displayed, perhaps because the line was continued within it.
|
|
|
517 If OFFSETS is nil, HSCROLL and TAB-OFFSET are assumed to be zero.
|
|
|
518
|
|
|
519 WINDOW is the window to operate on. Currently this is used only to
|
|
|
520 find the display table. It does not matter what buffer WINDOW displays;
|
|
|
521 `compute-motion' always operates on the current buffer.
|
|
|
522
|
|
|
523 The value is a list of five elements:
|
|
|
524 (POS HPOS VPOS PREVHPOS CONTIN)
|
|
|
525 POS is the buffer position where the scan stopped.
|
|
|
526 VPOS is the vertical position where the scan stopped.
|
|
|
527 HPOS is the horizontal position where the scan stopped.
|
|
|
528
|
|
|
529 PREVHPOS is the horizontal position one character back from POS.
|
|
|
530 CONTIN is t if a line was continued after (or within) the previous character.
|
|
|
531
|
|
|
532 For example, to find the buffer position of column COL of line LINE
|
|
|
533 of a certain window, pass the window's starting location as FROM
|
|
|
534 and the window's upper-left coordinates as FROMPOS.
|
|
|
535 Pass the buffer's (point-max) as TO, to limit the scan to the end of the
|
|
|
536 visible section of the buffer, and pass LINE and COL as TOPOS.
|
|
|
537 */
|
|
|
538 (from, frompos, to, topos, width, offsets, window))
|
|
|
539 {
|
|
665
|
540 Lisp_Object charbpos, hpos, vpos, prevhpos, contin;
|
|
428
|
541 struct position *pos;
|
|
|
542 int hscroll, tab_offset;
|
|
|
543 struct window *w = decode_window (window);
|
|
|
544
|
|
|
545 CHECK_INT_COERCE_MARKER (from);
|
|
|
546 CHECK_CONS (frompos);
|
|
|
547 CHECK_INT (XCAR (frompos));
|
|
|
548 CHECK_INT (XCDR (frompos));
|
|
|
549 CHECK_INT_COERCE_MARKER (to);
|
|
|
550 CHECK_CONS (topos);
|
|
|
551 CHECK_INT (XCAR (topos));
|
|
|
552 CHECK_INT (XCDR (topos));
|
|
|
553 CHECK_INT (width);
|
|
|
554 if (!NILP (offsets))
|
|
|
555 {
|
|
|
556 CHECK_CONS (offsets);
|
|
|
557 CHECK_INT (XCAR (offsets));
|
|
|
558 CHECK_INT (XCDR (offsets));
|
|
|
559 hscroll = XINT (XCAR (offsets));
|
|
|
560 tab_offset = XINT (XCDR (offsets));
|
|
|
561 }
|
|
|
562 else
|
|
|
563 hscroll = tab_offset = 0;
|
|
|
564
|
|
|
565 pos = compute_motion (XINT (from), XINT (XCDR (frompos)),
|
|
|
566 XINT (XCAR (frompos)),
|
|
|
567 XINT (to), XINT (XCDR (topos)),
|
|
|
568 XINT (XCAR (topos)),
|
|
|
569 XINT (width), hscroll, tab_offset, w);
|
|
|
570
|
|
793
|
571 charbpos = make_int (pos->charbpos);
|
|
|
572 hpos = make_int (pos->hpos);
|
|
|
573 vpos = make_int (pos->vpos);
|
|
|
574 prevhpos = make_int (pos->prevhpos);
|
|
428
|
575
|
|
665
|
576 return list5 (charbpos, hpos, vpos, prevhpos,
|
|
428
|
577 pos->contin ? Qt : Qnil);
|
|
|
578 }
|
|
|
579
|
|
|
580 #endif /* 0 */
|
|
|
581
|
|
|
582 /* Helper for vmotion_1 - compute vertical pixel motion between
|
|
|
583 START and END in the line start cache CACHE. This just sums
|
|
|
584 the line heights, including both the starting and ending lines.
|
|
|
585 */
|
|
|
586 static int
|
|
|
587 vpix_motion (line_start_cache_dynarr *cache, int start, int end)
|
|
|
588 {
|
|
|
589 int i, vpix;
|
|
|
590
|
|
|
591 assert (start <= end);
|
|
|
592 assert (start >= 0);
|
|
|
593 assert (end < Dynarr_length (cache));
|
|
|
594
|
|
|
595 vpix = 0;
|
|
|
596 for (i = start; i <= end; i++)
|
|
|
597 vpix += Dynarr_atp (cache, i)->height;
|
|
|
598
|
|
|
599 return vpix;
|
|
|
600 }
|
|
|
601
|
|
|
602 /*****************************************************************************
|
|
|
603 vmotion_1
|
|
|
604
|
|
|
605 Given a starting position ORIG, move point VTARGET lines in WINDOW.
|
|
|
606 Returns the new value for point. If the arg ret_vpos is not nil, it is
|
|
|
607 taken to be a pointer to an int and the number of lines actually moved is
|
|
|
608 returned in it. If the arg ret_vpix is not nil, it is taken to be a
|
|
|
609 pointer to an int and the vertical pixel height of the motion which
|
|
|
610 took place is returned in it.
|
|
|
611 ****************************************************************************/
|
|
665
|
612 static Charbpos
|
|
|
613 vmotion_1 (struct window *w, Charbpos orig, int vtarget,
|
|
428
|
614 int *ret_vpos, int *ret_vpix)
|
|
|
615 {
|
|
|
616 struct buffer *b = XBUFFER (w->buffer);
|
|
|
617 int elt;
|
|
|
618
|
|
|
619 elt = point_in_line_start_cache (w, orig, (vtarget < 0
|
|
|
620 ? -vtarget
|
|
|
621 : vtarget));
|
|
|
622
|
|
|
623 /* #### This assertion must be true before the if statements are hit
|
|
|
624 but may possibly be wrong after the call to
|
|
|
625 point_in_line_start_cache if orig is outside of the visible
|
|
|
626 region of the buffer. Handle this. */
|
|
|
627 assert (elt >= 0);
|
|
|
628
|
|
|
629 /* Moving downward. */
|
|
|
630 if (vtarget > 0)
|
|
|
631 {
|
|
|
632 int cur_line = Dynarr_length (w->line_start_cache) - 1 - elt;
|
|
665
|
633 Charbpos ret_pt;
|
|
428
|
634
|
|
|
635 if (cur_line > vtarget)
|
|
|
636 cur_line = vtarget;
|
|
|
637
|
|
|
638 /* The traditional FSF behavior is to return the end of buffer
|
|
|
639 position if we couldn't move far enough because we hit it. */
|
|
|
640 if (cur_line < vtarget)
|
|
|
641 ret_pt = BUF_ZV (b);
|
|
|
642 else
|
|
|
643 ret_pt = Dynarr_atp (w->line_start_cache, cur_line + elt)->start;
|
|
|
644
|
|
|
645 while (ret_pt > BUF_ZV (b) && cur_line > 0)
|
|
|
646 {
|
|
|
647 cur_line--;
|
|
|
648 ret_pt = Dynarr_atp (w->line_start_cache, cur_line + elt)->start;
|
|
|
649 }
|
|
|
650
|
|
|
651 if (ret_vpos) *ret_vpos = cur_line;
|
|
|
652 if (ret_vpix)
|
|
|
653 *ret_vpix = vpix_motion (w->line_start_cache, elt, cur_line + elt);
|
|
|
654 return ret_pt;
|
|
|
655 }
|
|
|
656 else if (vtarget < 0)
|
|
|
657 {
|
|
|
658 if (elt < -vtarget)
|
|
|
659 {
|
|
|
660 if (ret_vpos) *ret_vpos = -elt;
|
|
|
661 if (ret_vpix)
|
|
|
662 *ret_vpix = vpix_motion (w->line_start_cache, 0, elt);
|
|
|
663 /* #### This should be BUF_BEGV (b), right? */
|
|
4967
|
664 return Dynarr_begin (w->line_start_cache)->start;
|
|
428
|
665 }
|
|
|
666 else
|
|
|
667 {
|
|
|
668 if (ret_vpos) *ret_vpos = vtarget;
|
|
|
669 if (ret_vpix)
|
|
|
670 *ret_vpix = vpix_motion (w->line_start_cache, elt + vtarget, elt);
|
|
|
671 return Dynarr_atp (w->line_start_cache, elt + vtarget)->start;
|
|
|
672 }
|
|
|
673 }
|
|
|
674 else
|
|
|
675 {
|
|
|
676 /* No vertical motion requested so we just return the position
|
|
|
677 of the beginning of the current line. */
|
|
|
678 if (ret_vpos) *ret_vpos = 0;
|
|
|
679 if (ret_vpix)
|
|
|
680 *ret_vpix = vpix_motion (w->line_start_cache, elt, elt);
|
|
|
681
|
|
|
682 return Dynarr_atp (w->line_start_cache, elt)->start;
|
|
|
683 }
|
|
|
684
|
|
1204
|
685 RETURN_NOT_REACHED(0); /* shut up compiler */
|
|
428
|
686 }
|
|
|
687
|
|
|
688 /*****************************************************************************
|
|
|
689 vmotion
|
|
|
690
|
|
|
691 Given a starting position ORIG, move point VTARGET lines in WINDOW.
|
|
|
692 Returns the new value for point. If the arg ret_vpos is not nil, it is
|
|
|
693 taken to be a pointer to an int and the number of lines actually moved is
|
|
|
694 returned in it.
|
|
|
695 ****************************************************************************/
|
|
665
|
696 Charbpos
|
|
|
697 vmotion (struct window *w, Charbpos orig, int vtarget, int *ret_vpos)
|
|
428
|
698 {
|
|
|
699 return vmotion_1 (w, orig, vtarget, ret_vpos, NULL);
|
|
|
700 }
|
|
|
701
|
|
|
702 /* Helper for Fvertical_motion.
|
|
|
703 */
|
|
|
704 static
|
|
|
705 Lisp_Object vertical_motion_1 (Lisp_Object lines, Lisp_Object window,
|
|
|
706 int pixels)
|
|
|
707 {
|
|
665
|
708 Charbpos charbpos;
|
|
|
709 Charbpos orig;
|
|
428
|
710 int selected;
|
|
|
711 int *vpos, *vpix;
|
|
|
712 int value=0;
|
|
|
713 struct window *w;
|
|
|
714
|
|
|
715 if (NILP (window))
|
|
|
716 window = Fselected_window (Qnil);
|
|
|
717
|
|
|
718 CHECK_LIVE_WINDOW (window);
|
|
|
719 CHECK_INT (lines);
|
|
|
720
|
|
|
721 selected = (EQ (window, Fselected_window (Qnil)));
|
|
|
722
|
|
|
723 w = XWINDOW (window);
|
|
|
724
|
|
|
725 orig = selected ? BUF_PT (XBUFFER (w->buffer))
|
|
|
726 : marker_position (w->pointm[CURRENT_DISP]);
|
|
|
727
|
|
|
728 vpos = pixels ? NULL : &value;
|
|
|
729 vpix = pixels ? &value : NULL;
|
|
|
730
|
|
665
|
731 charbpos = vmotion_1 (w, orig, XINT (lines), vpos, vpix);
|
|
428
|
732
|
|
|
733 /* Note that the buffer's point is set, not the window's point. */
|
|
|
734 if (selected)
|
|
665
|
735 BUF_SET_PT (XBUFFER (w->buffer), charbpos);
|
|
428
|
736 else
|
|
|
737 set_marker_restricted (w->pointm[CURRENT_DISP],
|
|
665
|
738 make_int(charbpos),
|
|
428
|
739 w->buffer);
|
|
|
740
|
|
|
741 return make_int (value);
|
|
|
742 }
|
|
|
743
|
|
|
744 DEFUN ("vertical-motion", Fvertical_motion, 1, 3, 0, /*
|
|
|
745 Move to start of frame line LINES lines down.
|
|
|
746 If LINES is negative, this is moving up.
|
|
|
747 Optional second argument is WINDOW to move in,
|
|
|
748 the default is the selected window.
|
|
|
749
|
|
|
750 Sets point to position found; this may be start of line
|
|
|
751 or just the start of a continuation line.
|
|
|
752 If optional third argument PIXELS is nil, returns number
|
|
|
753 of lines moved; may be closer to zero than LINES if beginning
|
|
|
754 or end of buffer was reached. If PIXELS is non-nil, the
|
|
|
755 vertical pixel height of the motion which took place is
|
|
|
756 returned instead of the actual number of lines moved. A
|
|
|
757 motion of zero lines returns the height of the current line.
|
|
|
758
|
|
1268
|
759 NOTE NOTE NOTE: GNU Emacs/XEmacs difference.
|
|
|
760
|
|
|
761 What `vertical-motion' actually does is set WINDOW's buffer's point
|
|
|
762 if WINDOW is the selected window; else, it sets WINDOW's point.
|
|
|
763 This is unfortunately somewhat tricky to work with, and different
|
|
|
764 from GNU Emacs, which always uses the current buffer, not WINDOW's
|
|
|
765 buffer, always sets current buffer's point, and, from the
|
|
|
766 perspective of this function, temporarily makes WINDOW display
|
|
|
767 the current buffer if it wasn't already.
|
|
428
|
768 */
|
|
|
769 (lines, window, pixels))
|
|
|
770 {
|
|
|
771 return vertical_motion_1 (lines, window, !NILP (pixels));
|
|
|
772 }
|
|
|
773
|
|
|
774 /*
|
|
|
775 * Like vmotion() but requested and returned movement is in pixels.
|
|
|
776 * HOW specifies the stopping condition. Positive means move at least
|
|
|
777 * PIXELS. Negative means at most. Zero means as close as possible.
|
|
|
778 */
|
|
665
|
779 Charbpos
|
|
|
780 vmotion_pixels (Lisp_Object window, Charbpos start, int pixels, int how,
|
|
428
|
781 int *motion)
|
|
|
782 {
|
|
|
783 struct window *w;
|
|
665
|
784 Charbpos eobuf, bobuf;
|
|
428
|
785 int defheight;
|
|
|
786 int needed;
|
|
|
787 int line, next;
|
|
|
788 int remain, abspix, dirn;
|
|
|
789 int elt, nelt;
|
|
|
790 int i;
|
|
|
791 line_start_cache_dynarr *cache;
|
|
|
792 int previous = -1;
|
|
|
793 int lines;
|
|
|
794
|
|
|
795 if (NILP (window))
|
|
|
796 window = Fselected_window (Qnil);
|
|
|
797
|
|
|
798 CHECK_LIVE_WINDOW (window);
|
|
|
799 w = XWINDOW (window);
|
|
|
800
|
|
|
801 eobuf = BUF_ZV (XBUFFER (w->buffer));
|
|
|
802 bobuf = BUF_BEGV (XBUFFER (w->buffer));
|
|
|
803
|
|
|
804 default_face_height_and_width (window, &defheight, NULL);
|
|
|
805
|
|
|
806 /* guess num lines needed in line start cache + a few extra */
|
|
|
807 abspix = abs (pixels);
|
|
|
808 needed = (abspix + defheight-1)/defheight + 3;
|
|
|
809
|
|
|
810 dirn = (pixels >= 0) ? 1 : -1;
|
|
|
811
|
|
|
812 while (1)
|
|
|
813 {
|
|
|
814 elt = point_in_line_start_cache (w, start, needed);
|
|
|
815 assert (elt >= 0); /* in the cache */
|
|
|
816
|
|
|
817 cache = w->line_start_cache;
|
|
|
818 nelt = Dynarr_length (cache);
|
|
|
819
|
|
|
820 *motion = 0;
|
|
|
821
|
|
|
822 if (pixels == 0)
|
|
|
823 /* No vertical motion requested so we just return the position
|
|
|
824 of the beginning of the current display line. */
|
|
|
825 return Dynarr_atp (cache, elt)->start;
|
|
|
826
|
|
|
827 if ((dirn < 0 && elt == 0 &&
|
|
|
828 Dynarr_atp (cache, elt)->start <= bobuf) ||
|
|
|
829 (dirn > 0 && elt == nelt-1 &&
|
|
|
830 Dynarr_atp (cache, elt)->end >= eobuf))
|
|
|
831 return Dynarr_atp (cache, elt)->start;
|
|
|
832
|
|
|
833 remain = abspix;
|
|
|
834 for (i = elt; (dirn > 0) ? (i < nelt) : (i > 0); i += dirn)
|
|
|
835 {
|
|
|
836 /* cache line we're considering moving over */
|
|
|
837 int ii = (dirn > 0) ? i : i-1;
|
|
|
838
|
|
|
839 if (remain < 0)
|
|
|
840 return Dynarr_atp (cache, i)->start;
|
|
|
841
|
|
|
842 line = Dynarr_atp (cache, ii)->height;
|
|
|
843 next = remain - line;
|
|
|
844
|
|
|
845 /* is stopping condition satisfied? */
|
|
|
846 if ((how > 0 && remain <= 0) || /* at least */
|
|
|
847 (how < 0 && next < 0) || /* at most */
|
|
|
848 (how == 0 && remain <= abs (next))) /* closest */
|
|
|
849 return Dynarr_atp (cache, i)->start;
|
|
|
850
|
|
|
851 /* moving down and nowhere left to go? */
|
|
|
852 if (dirn > 0 && Dynarr_atp (cache, ii)->end >= eobuf)
|
|
|
853 return Dynarr_atp (cache, ii)->start;
|
|
|
854
|
|
|
855 /* take the step */
|
|
|
856 remain = next;
|
|
|
857 *motion += dirn * line;
|
|
|
858
|
|
|
859 /* moving up and nowhere left to go? */
|
|
|
860 if (dirn < 0 && Dynarr_atp (cache, ii)->start <= bobuf)
|
|
|
861 return Dynarr_atp (cache, ii)->start;
|
|
|
862 }
|
|
|
863
|
|
|
864 /* get here => need more cache lines. try again. */
|
|
|
865 assert (abs (*motion) > previous); /* progress? */
|
|
|
866 previous = abs (*motion);
|
|
|
867
|
|
|
868 lines = (pixels < 0) ? elt : (nelt - elt);
|
|
|
869 needed += (remain*lines + abspix-1)/abspix + 3;
|
|
|
870 }
|
|
|
871
|
|
1204
|
872 RETURN_NOT_REACHED(0); /* shut up compiler */
|
|
428
|
873 }
|
|
|
874
|
|
|
875 DEFUN ("vertical-motion-pixels", Fvertical_motion_pixels, 1, 3, 0, /*
|
|
|
876 Move to start of frame line PIXELS vertical pixels down.
|
|
|
877 If PIXELS is negative, this is moving up.
|
|
|
878 The actual vertical motion in pixels is returned.
|
|
|
879
|
|
|
880 Optional second argument is WINDOW to move in,
|
|
|
881 the default is the selected window.
|
|
|
882
|
|
|
883 Optional third argument HOW specifies when to stop. A value
|
|
|
884 less than zero indicates that the motion should be no more
|
|
|
885 than PIXELS. A value greater than zero indicates that the
|
|
|
886 motion should be at least PIXELS. Any other value indicates
|
|
|
887 that the motion should be as close as possible to PIXELS.
|
|
|
888 */
|
|
|
889 (pixels, window, how))
|
|
|
890 {
|
|
665
|
891 Charbpos charbpos;
|
|
|
892 Charbpos orig;
|
|
428
|
893 int selected;
|
|
|
894 int motion;
|
|
|
895 int howto;
|
|
|
896 struct window *w;
|
|
|
897
|
|
|
898 if (NILP (window))
|
|
|
899 window = Fselected_window (Qnil);
|
|
|
900
|
|
|
901 CHECK_LIVE_WINDOW (window);
|
|
|
902 CHECK_INT (pixels);
|
|
|
903
|
|
|
904 selected = (EQ (window, Fselected_window (Qnil)));
|
|
|
905
|
|
|
906 w = XWINDOW (window);
|
|
|
907
|
|
|
908 orig = selected ? BUF_PT (XBUFFER (w->buffer))
|
|
|
909 : marker_position (w->pointm[CURRENT_DISP]);
|
|
|
910
|
|
|
911 howto = INTP (how) ? XINT (how) : 0;
|
|
|
912
|
|
665
|
913 charbpos = vmotion_pixels (window, orig, XINT (pixels), howto, &motion);
|
|
428
|
914
|
|
|
915 if (selected)
|
|
665
|
916 BUF_SET_PT (XBUFFER (w->buffer), charbpos);
|
|
428
|
917 else
|
|
|
918 set_marker_restricted (w->pointm[CURRENT_DISP],
|
|
665
|
919 make_int(charbpos),
|
|
428
|
920 w->buffer);
|
|
|
921
|
|
|
922 return make_int (motion);
|
|
|
923 }
|
|
|
924
|
|
|
925
|
|
|
926 void
|
|
|
927 syms_of_indent (void)
|
|
|
928 {
|
|
|
929 DEFSUBR (Fcurrent_indentation);
|
|
|
930 DEFSUBR (Findent_to);
|
|
|
931 DEFSUBR (Fcurrent_column);
|
|
|
932 DEFSUBR (Fmove_to_column);
|
|
|
933 #if 0 /* #### */
|
|
|
934 DEFSUBR (Fcompute_motion);
|
|
|
935 #endif
|
|
|
936 DEFSUBR (Fvertical_motion);
|
|
|
937 DEFSUBR (Fvertical_motion_pixels);
|
|
|
938 }
|
|
|
939
|
|
|
940 void
|
|
|
941 vars_of_indent (void)
|
|
|
942 {
|
|
|
943 DEFVAR_BOOL ("indent-tabs-mode", &indent_tabs_mode /*
|
|
|
944 *Indentation can insert tabs if this is non-nil.
|
|
|
945 Setting this variable automatically makes it local to the current buffer.
|
|
|
946 */ );
|
|
|
947 indent_tabs_mode = 1;
|
|
|
948 }
|
