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595 lines
17 KiB
C
595 lines
17 KiB
C
/* Simple built-in editing commands.
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Copyright (C) 1985, 93, 94, 95, 96, 1997 Free Software Foundation, Inc.
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This file is part of GNU Emacs.
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GNU Emacs is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Emacs is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Emacs; see the file COPYING. If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <config.h>
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#include "lisp.h"
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#include "commands.h"
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#include "buffer.h"
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#include "charset.h"
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#include "syntax.h"
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#include "window.h"
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#include "keyboard.h"
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Lisp_Object Qkill_forward_chars, Qkill_backward_chars, Vblink_paren_function;
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/* A possible value for a buffer's overwrite-mode variable. */
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Lisp_Object Qoverwrite_mode_binary;
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/* Non-nil means put this face on the next self-inserting character. */
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Lisp_Object Vself_insert_face;
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/* This is the command that set up Vself_insert_face. */
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Lisp_Object Vself_insert_face_command;
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/* Offset to add to a non-ASCII value when inserting it. */
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int nonascii_insert_offset;
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extern Lisp_Object Qface;
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/* Return buffer position which is N characters after `point'. */
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int
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forward_point (n)
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int n;
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{
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int pos = PT, c;
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if (!NILP (current_buffer->enable_multibyte_characters))
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{
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/* Simply adding N to `point' doesn't work because of multi-byte
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form. We had better not use INC_POS and DEC_POS because they
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check the gap position every time. But, for the moment, we
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need working code. */
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if (n > 0)
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{
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while (pos < ZV && n--) INC_POS (pos);
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if (pos < ZV) n++;
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}
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else
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{
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while (pos > BEGV && n++) DEC_POS (pos);
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if (pos > BEGV) n--;
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}
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}
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pos += n;
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return pos;
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}
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DEFUN ("forward-point", Fforward_point, Sforward_point, 1, 1, 0,
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"Return buffer position N characters after (before if N negative) point.")
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(n)
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Lisp_Object n;
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{
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CHECK_NUMBER (n, 0);
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return make_number (forward_point (XINT (n)));
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}
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DEFUN ("forward-char", Fforward_char, Sforward_char, 0, 1, "p",
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"Move point right N characters (left if N is negative).\n\
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On reaching end of buffer, stop and signal error.")
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(n)
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Lisp_Object n;
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{
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if (NILP (n))
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XSETFASTINT (n, 1);
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else
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CHECK_NUMBER (n, 0);
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/* This used to just set point to point + XINT (n), and then check
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to see if it was within boundaries. But now that SET_PT can
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potentially do a lot of stuff (calling entering and exiting
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hooks, etcetera), that's not a good approach. So we validate the
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proposed position, then set point. */
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{
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int new_point = forward_point (XINT (n));
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if (new_point < BEGV)
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{
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SET_PT (BEGV);
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Fsignal (Qbeginning_of_buffer, Qnil);
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}
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if (new_point > ZV)
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{
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SET_PT (ZV);
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Fsignal (Qend_of_buffer, Qnil);
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}
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SET_PT (new_point);
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}
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return Qnil;
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}
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DEFUN ("backward-char", Fbackward_char, Sbackward_char, 0, 1, "p",
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"Move point left N characters (right if N is negative).\n\
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On attempt to pass beginning or end of buffer, stop and signal error.")
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(n)
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Lisp_Object n;
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{
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if (NILP (n))
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XSETFASTINT (n, 1);
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else
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CHECK_NUMBER (n, 0);
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XSETINT (n, - XINT (n));
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return Fforward_char (n);
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}
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DEFUN ("forward-line", Fforward_line, Sforward_line, 0, 1, "p",
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"Move N lines forward (backward if N is negative).\n\
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Precisely, if point is on line I, move to the start of line I + N.\n\
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If there isn't room, go as far as possible (no error).\n\
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Returns the count of lines left to move. If moving forward,\n\
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that is N - number of lines moved; if backward, N + number moved.\n\
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With positive N, a non-empty line at the end counts as one line\n\
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successfully moved (for the return value).")
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(n)
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Lisp_Object n;
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{
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int pos2 = PT;
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int pos;
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int count, shortage, negp;
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if (NILP (n))
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count = 1;
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else
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{
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CHECK_NUMBER (n, 0);
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count = XINT (n);
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}
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negp = count <= 0;
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pos = scan_buffer ('\n', pos2, 0, count - negp, &shortage, 1);
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if (shortage > 0
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&& (negp
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|| (ZV > BEGV
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&& pos != pos2
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&& FETCH_BYTE (pos - 1) != '\n')))
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shortage--;
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SET_PT (pos);
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return make_number (negp ? - shortage : shortage);
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}
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DEFUN ("beginning-of-line", Fbeginning_of_line, Sbeginning_of_line,
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0, 1, "p",
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"Move point to beginning of current line.\n\
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With argument N not nil or 1, move forward N - 1 lines first.\n\
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If scan reaches end of buffer, stop there without error.")
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(n)
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Lisp_Object n;
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{
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if (NILP (n))
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XSETFASTINT (n, 1);
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else
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CHECK_NUMBER (n, 0);
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SET_PT (XINT (Fline_beginning_position (n)));
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return Qnil;
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}
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DEFUN ("end-of-line", Fend_of_line, Send_of_line,
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0, 1, "p",
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"Move point to end of current line.\n\
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With argument N not nil or 1, move forward N - 1 lines first.\n\
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If scan reaches end of buffer, stop there without error.")
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(n)
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Lisp_Object n;
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{
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register int pos;
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register int stop;
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if (NILP (n))
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XSETFASTINT (n, 1);
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else
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CHECK_NUMBER (n, 0);
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SET_PT (XINT (Fline_end_position (n)));
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return Qnil;
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}
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DEFUN ("delete-char", Fdelete_char, Sdelete_char, 1, 2, "p\nP",
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"Delete the following N characters (previous if N is negative).\n\
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Optional second arg KILLFLAG non-nil means kill instead (save in kill ring).\n\
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Interactively, N is the prefix arg, and KILLFLAG is set if\n\
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N was explicitly specified.")
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(n, killflag)
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Lisp_Object n, killflag;
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{
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int pos;
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CHECK_NUMBER (n, 0);
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pos = forward_point (XINT (n));
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if (NILP (killflag))
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{
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if (XINT (n) < 0)
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{
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if (pos < BEGV)
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Fsignal (Qbeginning_of_buffer, Qnil);
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else
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del_range (pos, PT);
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}
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else
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{
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if (pos > ZV)
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Fsignal (Qend_of_buffer, Qnil);
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else
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del_range (PT, pos);
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}
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}
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else
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{
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call1 (Qkill_forward_chars, n);
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}
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return Qnil;
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}
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DEFUN ("delete-backward-char", Fdelete_backward_char, Sdelete_backward_char,
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1, 2, "p\nP",
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"Delete the previous N characters (following if N is negative).\n\
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Optional second arg KILLFLAG non-nil means kill instead (save in kill ring).\n\
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Interactively, N is the prefix arg, and KILLFLAG is set if\n\
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N was explicitly specified.")
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(n, killflag)
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Lisp_Object n, killflag;
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{
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Lisp_Object value;
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int deleted_special = 0;
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int pos, i;
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CHECK_NUMBER (n, 0);
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/* See if we are about to delete a tab or newline backwards. */
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pos = PT;
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for (i = 0; i < XINT (n) && pos > BEGV; i++)
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{
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int c;
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DEC_POS (pos);
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c = FETCH_BYTE (pos);
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if (c == '\t' || c == '\n')
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{
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deleted_special = 1;
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break;
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}
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}
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/* In overwrite mode, back over columns while clearing them out,
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unless at end of line. */
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if (XINT (n) > 0
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&& ! NILP (current_buffer->overwrite_mode)
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&& ! deleted_special
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&& ! (PT == ZV || FETCH_BYTE (PT) == '\n'))
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{
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int column = current_column ();
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value = Fdelete_char (make_number (-XINT (n)), killflag);
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i = column - current_column ();
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Finsert_char (make_number (' '), make_number (i), Qnil);
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SET_PT (PT - i);
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}
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else
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value = Fdelete_char (make_number (-XINT (n)), killflag);
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return value;
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}
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DEFUN ("self-insert-command", Fself_insert_command, Sself_insert_command, 1, 1, "p",
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"Insert the character you type.\n\
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Whichever character you type to run this command is inserted.")
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(n)
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Lisp_Object n;
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{
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int character = XINT (last_command_char);
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CHECK_NUMBER (n, 0);
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/* Barf if the key that invoked this was not a character. */
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if (!INTEGERP (last_command_char))
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bitch_at_user ();
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else if (XINT (n) >= 2 && NILP (current_buffer->overwrite_mode))
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{
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int modified_char = character;
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/* Add the offset to the character, for Finsert_char.
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We pass internal_self_insert the unmodified character
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because it itself does this offsetting. */
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if (modified_char >= 0200 && modified_char <= 0377
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&& ! NILP (current_buffer->enable_multibyte_characters))
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modified_char += nonascii_insert_offset;
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XSETFASTINT (n, XFASTINT (n) - 2);
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/* The first one might want to expand an abbrev. */
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internal_self_insert (character, 1);
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/* The bulk of the copies of this char can be inserted simply.
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We don't have to handle a user-specified face specially
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because it will get inherited from the first char inserted. */
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Finsert_char (make_number (modified_char), n, Qt);
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/* The last one might want to auto-fill. */
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internal_self_insert (character, 0);
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}
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else
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while (XINT (n) > 0)
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{
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/* Ok since old and new vals both nonneg */
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XSETFASTINT (n, XFASTINT (n) - 1);
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internal_self_insert (character, XFASTINT (n) != 0);
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}
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return Qnil;
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}
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/* Insert character C. If NOAUTOFILL is nonzero, don't do autofill
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even if it is enabled.
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If this insertion is suitable for direct output (completely simple),
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return 0. A value of 1 indicates this *might* not have been simple.
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A value of 2 means this did things that call for an undo boundary. */
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internal_self_insert (c, noautofill)
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int c;
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int noautofill;
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{
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extern Lisp_Object Fexpand_abbrev ();
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int hairy = 0;
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Lisp_Object tem;
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register enum syntaxcode synt;
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Lisp_Object overwrite, string;
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/* Length of multi-byte form of C. */
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int len;
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/* Working buffer and pointer for multi-byte form of C. */
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unsigned char workbuf[4], *str;
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int number_to_delete = 0;
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int spaces_to_insert = 0;
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if (c >= 0200 && c <= 0377
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&& ! NILP (current_buffer->enable_multibyte_characters))
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c += nonascii_insert_offset;
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overwrite = current_buffer->overwrite_mode;
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if (!NILP (Vbefore_change_function) || !NILP (Vafter_change_function)
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|| !NILP (Vbefore_change_functions) || !NILP (Vafter_change_functions))
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hairy = 1;
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/* At first, get multi-byte form of C in STR. */
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if (!NILP (current_buffer->enable_multibyte_characters))
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len = CHAR_STRING (c, workbuf, str);
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else
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workbuf[0] = c, str = workbuf, len = 1;
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if (!NILP (overwrite)
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&& PT < ZV)
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{
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/* In overwrite-mode, we substitute a character at point (C2,
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hereafter) by C. For that, we delete C2 in advance. But,
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just substituting C2 by C may move a remaining text in the
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line to the right or to the left, which is not preferable.
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So we insert more spaces or delete more characters in the
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following cases: if C is narrower than C2, after deleting C2,
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we fill columns with spaces, if C is wider than C2, we delete
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C2 and several characters following C2. */
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/* A code at `point'. Since this is checked only against
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NEWLINE and TAB, we don't need a character code but only the
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first byte of multi-byte form. */
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unsigned char c2 = FETCH_BYTE (PT);
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/* A column the cursor should be placed at after this insertion.
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The correct value should be calculated only when necessary. */
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int target_clm = 0;
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/* Overwriting in binary-mode always replaces C2 by C.
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Overwriting in textual-mode doesn't always do that.
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It inserts newlines in the usual way,
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and inserts any character at end of line
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or before a tab if it doesn't use the whole width of the tab. */
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if (EQ (overwrite, Qoverwrite_mode_binary)
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|| (c != '\n'
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&& c2 != '\n'
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&& ! (c2 == '\t'
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&& XINT (current_buffer->tab_width) > 0
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&& XFASTINT (current_buffer->tab_width) < 20
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&& ((NILP (current_buffer->enable_multibyte_characters)
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? (target_clm = current_column () + 1)
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: (target_clm = current_column () + WIDTH_BY_CHAR_HEAD (str[0]))),
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target_clm % XFASTINT (current_buffer->tab_width)))))
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{
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int pos = PT;
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if (target_clm == 0)
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number_to_delete = forward_point (1) - PT;
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else
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{
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/* The actual cursor position after the trial of moving
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to column TARGET_CLM. It is greater than TARGET_CLM
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if the TARGET_CLM is middle of multi-column
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character. In that case, the new point is set after
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that character. */
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int actual_clm
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= XFASTINT (Fmove_to_column (make_number (target_clm), Qnil));
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number_to_delete = PT - pos;
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if (actual_clm > target_clm)
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{
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/* We will delete too many columns. Let's fill columns
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by spaces so that the remaining text won't move. */
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spaces_to_insert = actual_clm - target_clm;
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}
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}
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SET_PT (pos);
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hairy = 2;
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}
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hairy = 2;
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}
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if (!NILP (current_buffer->abbrev_mode)
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&& SYNTAX (c) != Sword
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&& NILP (current_buffer->read_only)
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&& PT > BEGV && SYNTAX (XFASTINT (Fprevious_char ())) == Sword)
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{
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int modiff = MODIFF;
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Lisp_Object sym;
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sym = Fexpand_abbrev ();
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/* If we expanded an abbrev which has only a hook,
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and the hook has a non-nil `no-self-insert' property,
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return right away--don't really self-insert. */
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if (! NILP (sym) && ! NILP (XSYMBOL (sym)->function)
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&& SYMBOLP (XSYMBOL (sym)->function))
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{
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Lisp_Object prop;
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prop = Fget (XSYMBOL (sym)->function, intern ("no-self-insert"));
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if (! NILP (prop))
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return 1;
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}
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if (MODIFF != modiff)
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hairy = 2;
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}
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if (number_to_delete)
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{
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string = make_string (str, len);
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if (spaces_to_insert)
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{
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tem = Fmake_string (make_number (spaces_to_insert),
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make_number (' '));
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string = concat2 (tem, string);
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}
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replace_range (PT, PT + number_to_delete, string, 1, 1);
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SET_PT (PT + XSTRING (string)->size);
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}
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else
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insert_and_inherit (str, len);
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if ((c == ' ' || c == '\n')
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&& !noautofill
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&& !NILP (current_buffer->auto_fill_function))
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{
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Lisp_Object tem;
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if (c == '\n')
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/* After inserting a newline, move to previous line and fill */
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/* that. Must have the newline in place already so filling and */
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/* justification, if any, know where the end is going to be. */
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SET_PT (PT - 1);
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tem = call0 (current_buffer->auto_fill_function);
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if (c == '\n')
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SET_PT (PT + 1);
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if (!NILP (tem))
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hairy = 2;
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}
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#ifdef HAVE_FACES
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/* If previous command specified a face to use, use it. */
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if (!NILP (Vself_insert_face)
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&& EQ (current_kboard->Vlast_command, Vself_insert_face_command))
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{
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Lisp_Object before, after;
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XSETINT (before, PT - len);
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XSETINT (after, PT);
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Fput_text_property (before, after, Qface, Vself_insert_face, Qnil);
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Vself_insert_face = Qnil;
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}
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#endif
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|
||
synt = SYNTAX (c);
|
||
if ((synt == Sclose || synt == Smath)
|
||
&& !NILP (Vblink_paren_function) && INTERACTIVE
|
||
&& !noautofill)
|
||
{
|
||
call0 (Vblink_paren_function);
|
||
hairy = 2;
|
||
}
|
||
return hairy;
|
||
}
|
||
|
||
/* module initialization */
|
||
|
||
syms_of_cmds ()
|
||
{
|
||
Qkill_backward_chars = intern ("kill-backward-chars");
|
||
staticpro (&Qkill_backward_chars);
|
||
|
||
Qkill_forward_chars = intern ("kill-forward-chars");
|
||
staticpro (&Qkill_forward_chars);
|
||
|
||
Qoverwrite_mode_binary = intern ("overwrite-mode-binary");
|
||
staticpro (&Qoverwrite_mode_binary);
|
||
|
||
DEFVAR_LISP ("self-insert-face", &Vself_insert_face,
|
||
"If non-nil, set the face of the next self-inserting character to this.\n\
|
||
See also `self-insert-face-command'.");
|
||
Vself_insert_face = Qnil;
|
||
|
||
DEFVAR_LISP ("self-insert-face-command", &Vself_insert_face_command,
|
||
"This is the command that set up `self-insert-face'.\n\
|
||
If `last-command' does not equal this value, we ignore `self-insert-face'.");
|
||
Vself_insert_face_command = Qnil;
|
||
|
||
DEFVAR_LISP ("blink-paren-function", &Vblink_paren_function,
|
||
"Function called, if non-nil, whenever a close parenthesis is inserted.\n\
|
||
More precisely, a char with closeparen syntax is self-inserted.");
|
||
Vblink_paren_function = Qnil;
|
||
|
||
DEFVAR_INT ("nonascii-insert-offset", &nonascii_insert_offset,
|
||
"Offset to add to a non-ascii code 0200...0377 when inserting it.\n\
|
||
This applies only when multibyte characters are enabled, and it serves\n\
|
||
to convert a Latin-1 or similar 8-bit character code to the corresponding\n\
|
||
Emacs character code.");
|
||
nonascii_insert_offset = 0;
|
||
|
||
defsubr (&Sforward_point);
|
||
defsubr (&Sforward_char);
|
||
defsubr (&Sbackward_char);
|
||
defsubr (&Sforward_line);
|
||
defsubr (&Sbeginning_of_line);
|
||
defsubr (&Send_of_line);
|
||
|
||
defsubr (&Sdelete_char);
|
||
defsubr (&Sdelete_backward_char);
|
||
|
||
defsubr (&Sself_insert_command);
|
||
}
|
||
|
||
keys_of_cmds ()
|
||
{
|
||
int n;
|
||
|
||
initial_define_key (global_map, Ctl ('I'), "self-insert-command");
|
||
for (n = 040; n < 0177; n++)
|
||
initial_define_key (global_map, n, "self-insert-command");
|
||
#ifdef MSDOS
|
||
for (n = 0200; n < 0240; n++)
|
||
initial_define_key (global_map, n, "self-insert-command");
|
||
#endif
|
||
for (n = 0240; n < 0400; n++)
|
||
initial_define_key (global_map, n, "self-insert-command");
|
||
|
||
initial_define_key (global_map, Ctl ('A'), "beginning-of-line");
|
||
initial_define_key (global_map, Ctl ('B'), "backward-char");
|
||
initial_define_key (global_map, Ctl ('D'), "delete-char");
|
||
initial_define_key (global_map, Ctl ('E'), "end-of-line");
|
||
initial_define_key (global_map, Ctl ('F'), "forward-char");
|
||
initial_define_key (global_map, 0177, "delete-backward-char");
|
||
}
|