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0
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1 /* Simple built-in editing commands.
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2 Copyright (C) 1985, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
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3
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4 This file is part of XEmacs.
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5
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6 XEmacs is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by the
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8 Free Software Foundation; either version 2, or (at your option) any
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9 later version.
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10
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11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with XEmacs; see the file COPYING. If not, write to
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18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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19 Boston, MA 02111-1307, USA. */
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20
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21 /* Synched up with: Mule 2.0, FSF 19.30. */
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22
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23 #include <config.h>
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24 #include "lisp.h"
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25 #include "commands.h"
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26 #include "buffer.h"
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27 #include "syntax.h"
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28 #include "insdel.h"
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29
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30 Lisp_Object Qkill_forward_chars;
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31 Lisp_Object Qself_insert_command;
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32
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33 Lisp_Object Vblink_paren_function;
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34
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35 /* A possible value for a buffer's overwrite-mode variable. */
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36 Lisp_Object Qoverwrite_mode_binary;
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37
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38 /* Non-nil means put this face on the next self-inserting character. */
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39 Lisp_Object Vself_insert_face;
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40
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41 /* This is the command that set up Vself_insert_face. */
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42 Lisp_Object Vself_insert_face_command;
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43
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44
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45 DEFUN ("forward-char", Fforward_char, Sforward_char, 0, 2, "_p" /*
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46 Move point right ARG characters (left if ARG negative).
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47 On reaching end of buffer, stop and signal error.
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48 If BUFFER is nil, the current buffer is assumed.
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49 */ )
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50 (arg, buffer)
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51 Lisp_Object arg, buffer;
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52 {
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53 struct buffer *buf = decode_buffer (buffer, 1);
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54
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55 if (NILP (arg))
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56 arg = make_int (1);
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57 else
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58 CHECK_INT (arg);
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59
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60 /* This used to just set point to point + XINT (arg), and then check
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61 to see if it was within boundaries. But now that SET_PT can
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62 potentially do a lot of stuff (calling entering and exiting
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63 hooks, etcetera), that's not a good approach. So we validate the
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64 proposed position, then set point. */
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65 {
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66 Bufpos new_point = BUF_PT (buf) + XINT (arg);
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67
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68 if (new_point < BUF_BEGV (buf))
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69 {
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70 BUF_SET_PT (buf, BUF_BEGV (buf));
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71 Fsignal (Qbeginning_of_buffer, Qnil);
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72 }
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73 if (new_point > BUF_ZV (buf))
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74 {
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75 BUF_SET_PT (buf, BUF_ZV (buf));
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76 Fsignal (Qend_of_buffer, Qnil);
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77 }
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78
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79 BUF_SET_PT (buf, new_point);
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80 }
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81
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82 return Qnil;
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83 }
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84
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85 DEFUN ("backward-char", Fbackward_char, Sbackward_char, 0, 2, "_p" /*
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86 Move point left ARG characters (right if ARG negative).
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87 On attempt to pass beginning or end of buffer, stop and signal error.
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88 If BUFFER is nil, the current buffer is assumed.
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89 */ )
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90 (arg, buffer)
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91 Lisp_Object arg, buffer;
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92 {
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93 if (NILP (arg))
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94 arg = make_int (1);
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95 else
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96 CHECK_INT (arg);
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97
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98 XSETINT (arg, - XINT (arg));
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99 return Fforward_char (arg, buffer);
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100 }
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101
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102 DEFUN ("forward-line", Fforward_line, Sforward_line, 0, 2, "_p" /*
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103 Move ARG lines forward (backward if ARG is negative).
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104 Precisely, if point is on line I, move to the start of line I + ARG.
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105 If there isn't room, go as far as possible (no error).
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106 Returns the count of lines left to move. If moving forward,
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107 that is ARG - number of lines moved; if backward, ARG + number moved.
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108 With positive ARG, a non-empty line at the end counts as one line
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109 successfully moved (for the return value).
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110 If BUFFER is nil, the current buffer is assumed.
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111 */ )
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112 (arg, buffer)
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113 Lisp_Object arg, buffer;
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114 {
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115 struct buffer *buf = decode_buffer (buffer, 1);
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116 Bufpos pos2 = BUF_PT (buf);
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117 Bufpos pos;
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118 int count, shortage, negp;
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119
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120 if (NILP (arg))
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121 count = 1;
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122 else
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123 {
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124 CHECK_INT (arg);
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125 count = XINT (arg);
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126 }
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127
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128 negp = count <= 0;
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129 pos = scan_buffer (buf, '\n', pos2, 0, count - negp, &shortage, 1);
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130 if (shortage > 0
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131 && (negp
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132 || (BUF_ZV (buf) > BUF_BEGV (buf)
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133 && pos != pos2
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134 && BUF_FETCH_CHAR (buf, pos - 1) != '\n')))
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135 shortage--;
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136 BUF_SET_PT (buf, pos);
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137 return make_int (negp ? - shortage : shortage);
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138 }
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139
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140 DEFUN ("beginning-of-line", Fbeginning_of_line, Sbeginning_of_line,
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141 0, 2, "_p" /*
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142 Move point to beginning of current line.
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143 With argument ARG not nil or 1, move forward ARG - 1 lines first.
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144 If scan reaches end of buffer, stop there without error.
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145 If BUFFER is nil, the current buffer is assumed.
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146 */ )
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147 (arg, buffer)
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148 Lisp_Object arg, buffer;
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149 {
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150 struct buffer *b = decode_buffer (buffer, 1);
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151
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152 XSETBUFFER (buffer, b);
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153 if (NILP (arg))
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154 arg = make_int (1);
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155 else
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156 CHECK_INT (arg);
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157
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158 Fforward_line (make_int (XINT (arg) - 1), buffer);
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159 return Qnil;
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160 }
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161
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162 DEFUN ("end-of-line", Fend_of_line, Send_of_line,
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163 0, 2, "_p" /*
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164 Move point to end of current line.
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165 With argument ARG not nil or 1, move forward ARG - 1 lines first.
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166 If scan reaches end of buffer, stop there without error.
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167 If BUFFER is nil, the current buffer is assumed.
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168 */ )
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169 (arg, buffer)
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170 Lisp_Object arg, buffer;
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171 {
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172 struct buffer *buf = decode_buffer (buffer, 1);
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173
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174 XSETBUFFER (buffer, buf);
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175
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176 if (NILP (arg))
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177 arg = make_int (1);
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178 else
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179 CHECK_INT (arg);
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180
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181 BUF_SET_PT (buf, find_before_next_newline (buf, BUF_PT (buf), 0,
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182 XINT (arg) - (XINT (arg) <= 0)));
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183 return Qnil;
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184 }
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185
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186 DEFUN ("delete-char", Fdelete_char, Sdelete_char, 1, 2, "*p\nP" /*
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187 Delete the following ARG characters (previous, with negative arg).
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188 Optional second arg KILLFLAG non-nil means kill instead (save in kill ring).
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189 Interactively, ARG is the prefix arg, and KILLFLAG is set if
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190 ARG was explicitly specified.
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191 */ )
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192 (arg, killflag)
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193 Lisp_Object arg, killflag;
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194 {
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195 /* This function can GC */
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196 Bufpos pos;
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197 struct buffer *buf = current_buffer;
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198
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199 CHECK_INT (arg);
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200
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201 pos = BUF_PT (buf) + XINT (arg);
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202 if (NILP (killflag))
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203 {
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204 if (XINT (arg) < 0)
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205 {
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206 if (pos < BUF_BEGV (buf))
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207 signal_error (Qbeginning_of_buffer, Qnil);
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208 else
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209 buffer_delete_range (buf, pos, BUF_PT (buf), 0);
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210 }
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211 else
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212 {
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213 if (pos > BUF_ZV (buf))
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214 signal_error (Qend_of_buffer, Qnil);
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215 else
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216 buffer_delete_range (buf, BUF_PT (buf), pos, 0);
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217 }
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218 }
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219 else
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220 {
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221 call1 (Qkill_forward_chars, arg);
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222 }
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223 return Qnil;
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224 }
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225
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226 DEFUN ("delete-backward-char", Fdelete_backward_char, Sdelete_backward_char,
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227 1, 2, "*p\nP" /*
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228 Delete the previous ARG characters (following, with negative ARG).
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229 Optional second arg KILLFLAG non-nil means kill instead (save in kill ring).
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230 Interactively, ARG is the prefix arg, and KILLFLAG is set if
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231 ARG was explicitly specified.
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232 */ )
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233 (arg, killflag)
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234 Lisp_Object arg, killflag;
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235 {
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236 /* This function can GC */
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237 CHECK_INT (arg);
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238 return Fdelete_char (make_int (-XINT (arg)), killflag);
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239 }
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240
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241 static void internal_self_insert (Emchar ch, int noautofill);
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242
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243 DEFUN ("self-insert-command", Fself_insert_command, Sself_insert_command, 1, 1, "*p" /*
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244 Insert the character you type.
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245 Whichever character you type to run this command is inserted.
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246 */ )
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247 (arg)
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248 Lisp_Object arg;
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249 {
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250 /* This function can GC */
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251 int n;
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252 Emchar ch;
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253 Lisp_Object c;
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254 CHECK_INT (arg);
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255
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256 if (CHAR_OR_CHAR_INTP (Vlast_command_char))
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257 c = Vlast_command_char;
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258 else
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259 c = Fevent_to_character (Vlast_command_event, Qnil, Qnil, Qt);
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260
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261 if (NILP (c))
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262 signal_simple_error ("last typed character has no ASCII equivalent",
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263 Fcopy_event (Vlast_command_event, Qnil));
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264
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265 CHECK_CHAR_COERCE_INT (c);
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266
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267 n = XINT (arg);
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268 ch = XCHAR (c);
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269 #if 0 /* FSFmacs */
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270 /* #### This optimization won't work because of differences in
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271 how the start-open and end-open properties default for text
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272 properties. See internal_self_insert(). */
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273 if (n >= 2 && NILP (current_buffer->overwrite_mode))
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274 {
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275 n -= 2;
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276 /* The first one might want to expand an abbrev. */
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277 internal_self_insert (c, 1);
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278 /* The bulk of the copies of this char can be inserted simply.
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279 We don't have to handle a user-specified face specially
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280 because it will get inherited from the first char inserted. */
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281 Finsert_char (make_char (c), make_int (n), Qt, Qnil);
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282 /* The last one might want to auto-fill. */
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283 internal_self_insert (c, 0);
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284 }
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285 else
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286 #endif /* 0 */
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287 while (n > 0)
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288 {
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289 n--;
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290 internal_self_insert (ch, (n != 0));
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291 }
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292 return Qnil;
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293 }
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294
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295 /* Insert character C1. If NOAUTOFILL is nonzero, don't do autofill
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296 even if it is enabled.
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297
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298 FSF:
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299
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300 If this insertion is suitable for direct output (completely simple),
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301 return 0. A value of 1 indicates this *might* not have been simple.
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302 A value of 2 means this did things that call for an undo boundary. */
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303
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304 static void
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305 internal_self_insert (Emchar c1, int noautofill)
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306 {
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307 /* This function can GC */
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308 /* int hairy = 0; -- unused */
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309 REGISTER enum syntaxcode synt;
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310 REGISTER Emchar c2;
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311 Lisp_Object overwrite;
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312 Lisp_Object syntax_table;
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313 struct buffer *buf = current_buffer;
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314
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315 overwrite = buf->overwrite_mode;
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316 syntax_table = buf->syntax_table;
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317
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318 #if 0
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319 /* No, this is very bad, it makes undo *always* undo a character at a time
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320 instead of grouping consecutive self-inserts together. Nasty nasty.
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321 */
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322 if (!NILP (Vbefore_change_functions) || !NILP (Vafter_change_functions)
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323 || !NILP (Vbefore_change_function) || !NILP (Vafter_change_function))
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324 hairy = 1;
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325 #endif
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326
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327 if (!NILP (overwrite)
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328 && BUF_PT (buf) < BUF_ZV (buf)
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329 && (EQ (overwrite, Qoverwrite_mode_binary)
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330 || (c1 != '\n' && BUF_FETCH_CHAR (buf, BUF_PT (buf)) != '\n'))
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331 && (EQ (overwrite, Qoverwrite_mode_binary)
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332 || BUF_FETCH_CHAR (buf, BUF_PT (buf)) != '\t'
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333 || XINT (buf->tab_width) <= 0
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334 || XINT (buf->tab_width) > 20
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335 || !((current_column (buf) + 1) % XINT (buf->tab_width))))
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336 {
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337 buffer_delete_range (buf, BUF_PT (buf), BUF_PT (buf) + 1, 0);
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338 /* hairy = 2; */
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339 }
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340
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341 if (!NILP (buf->abbrev_mode)
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342 && !WORD_SYNTAX_P (syntax_table, c1)
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343 && NILP (buf->read_only)
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344 && BUF_PT (buf) > BUF_BEGV (buf))
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345 {
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346 c2 = BUF_FETCH_CHAR (buf, BUF_PT (buf) - 1);
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347
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348 if (WORD_SYNTAX_P (syntax_table, c2))
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349 {
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350 /* int modiff = BUF_MODIFF (current_buffer); */
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351 Fexpand_abbrev ();
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352 /* We can't trust the value of Fexpand_abbrev,
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353 but if Fexpand_abbrev changed the buffer,
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354 assume it expanded something. */
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355 /* if (BUF_MODIFF (buf) != modiff)
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356 hairy = 2; */
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357 }
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358 }
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359 if ((c1 == ' ' || c1 == '\n')
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360 && !noautofill
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361 && !NILP (buf->auto_fill_function))
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362 {
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363 buffer_insert_emacs_char (buf, c1);
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364 if (c1 == '\n')
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365 /* After inserting a newline, move to previous line and fill */
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366 /* that. Must have the newline in place already so filling and */
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367 /* justification, if any, know where the end is going to be. */
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368 BUF_SET_PT (buf, BUF_PT (buf) - 1);
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369 call0 (buf->auto_fill_function);
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370 if (c1 == '\n')
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371 BUF_SET_PT (buf, BUF_PT (buf) + 1);
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372 /* hairy = 2; */
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373 }
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374 else
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375 buffer_insert_emacs_char (buf, c1);
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376
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377 /* If previous command specified a face to use, use it. */
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378 if (!NILP (Vself_insert_face)
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379 && EQ (Vlast_command, Vself_insert_face_command))
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380 {
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381 Lisp_Object before, after;
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382 XSETINT (before, BUF_PT (buf) - 1);
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383 XSETINT (after, BUF_PT (buf));
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384 Fput_text_property (before, after, Qface, Vself_insert_face, Qnil);
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385 Fput_text_property (before, after, Qstart_open, Qt, Qnil);
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386 Fput_text_property (before, after, Qend_open, Qnil, Qnil);
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387 /* #### FSFmacs properties are normally closed ("sticky") on the
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388 end but not the beginning. It's the opposite for us. */
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389 Vself_insert_face = Qnil;
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390 }
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391 synt = SYNTAX (syntax_table, c1);
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392 if ((synt == Sclose || synt == Smath)
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393 && !NILP (Vblink_paren_function) && INTERACTIVE
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394 && !noautofill)
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395 {
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396 call0 (Vblink_paren_function);
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397 /* hairy = 2; */
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398 }
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399
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400 /* return hairy; */
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401 }
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402
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403 /* (this comes from Mule but is a generally good idea) */
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404
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405 DEFUN ("self-insert-internal", Fself_insert_internal, Sself_insert_internal,
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406 1, 1, 0 /*
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407 Invoke `self-insert-command' as if CH is entered from keyboard.
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408 */ )
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409 (ch)
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410 Lisp_Object ch;
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411 {
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412 /* This function can GC */
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413 CHECK_CHAR_COERCE_INT (ch);
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414 internal_self_insert (XCHAR (ch), 0);
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415 return Qnil;
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416 }
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417
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418 /* module initialization */
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419
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420 void
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421 syms_of_cmds (void)
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422 {
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423 defsymbol (&Qkill_forward_chars, "kill-forward-chars");
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424 defsymbol (&Qself_insert_command, "self-insert-command");
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425 defsymbol (&Qoverwrite_mode_binary, "overwrite-mode-binary");
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426
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427 defsubr (&Sforward_char);
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428 defsubr (&Sbackward_char);
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429 defsubr (&Sforward_line);
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430 defsubr (&Sbeginning_of_line);
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431 defsubr (&Send_of_line);
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432
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433 defsubr (&Sdelete_char);
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434 defsubr (&Sdelete_backward_char);
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435
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436 defsubr (&Sself_insert_command);
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437 defsubr (&Sself_insert_internal);
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438 }
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439
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440 void
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|
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441 vars_of_cmds (void)
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442 {
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443 DEFVAR_LISP ("self-insert-face", &Vself_insert_face /*
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|
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444 If non-nil, set the face of the next self-inserting character to this.
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|
|
445 See also `self-insert-face-command'.
|
|
|
446 */ );
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|
|
447 Vself_insert_face = Qnil;
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|
|
448
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|
|
449 DEFVAR_LISP ("self-insert-face-command", &Vself_insert_face_command /*
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|
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450 This is the command that set up `self-insert-face'.
|
|
|
451 If `last-command' does not equal this value, we ignore `self-insert-face'.
|
|
|
452 */ );
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|
|
453 Vself_insert_face_command = Qnil;
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|
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454
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455 DEFVAR_LISP ("blink-paren-function", &Vblink_paren_function /*
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|
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456 Function called, if non-nil, whenever a close parenthesis is inserted.
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|
|
457 More precisely, a char with closeparen syntax is self-inserted.
|
|
|
458 */ );
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|
|
459 Vblink_paren_function = Qnil;
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|
|
460 }
|
