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- /* Simple built-in editing commands.
- Copyright (C) 1985, 1992, 1993, 1994 Free Software Foundation, Inc.
-
- This file is part of XEmacs.
-
- XEmacs is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by the
- Free Software Foundation; either version 2, or (at your option) any
- later version.
-
- XEmacs is distributed in the hope that it will be useful, but WITHOUT
- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- for more details.
-
- You should have received a copy of the GNU General Public License
- along with XEmacs; see the file COPYING. If not, write to the Free
- Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- /* Synched up with: Mule 2.0, FSF 19.28. */
-
- #include <config.h>
- #include "lisp.h"
- #include "commands.h"
- #include "buffer.h"
- #include "syntax.h"
- #include "insdel.h"
-
- Lisp_Object Qkill_forward_chars;
- Lisp_Object Qself_insert_command;
-
- Lisp_Object Vblink_paren_function;
-
- /* A possible value for a buffer's overwrite-mode variable. */
- Lisp_Object Qoverwrite_mode_binary;
-
-
- DEFUN ("forward-char", Fforward_char, Sforward_char, 0, 2, "_p",
- "Move point right ARG characters (left if ARG negative).\n\
- On reaching end of buffer, stop and signal error.\n\
- If BUFFER is nil, the current buffer is assumed.")
- (arg, buffer)
- Lisp_Object arg, buffer;
- {
- struct buffer *buf = decode_buffer (buffer, 1);
-
- if (NILP (arg))
- arg = make_number (1);
- else
- CHECK_INT (arg, 0);
-
- /* This used to just set point to point + XINT (arg), and then check
- to see if it was within boundaries. But now that SET_PT can
- potentially do a lot of stuff (calling entering and exiting
- hooks, etcetera), that's not a good approach. So we validate the
- proposed position, then set point. */
- {
- Bufpos new_point = BUF_PT (buf) + XINT (arg);
-
- if (new_point < BUF_BEGV (buf))
- {
- BUF_SET_PT (buf, BUF_BEGV (buf));
- Fsignal (Qbeginning_of_buffer, Qnil);
- }
- if (new_point > BUF_ZV (buf))
- {
- BUF_SET_PT (buf, BUF_ZV (buf));
- Fsignal (Qend_of_buffer, Qnil);
- }
-
- BUF_SET_PT (buf, new_point);
- }
-
- return Qnil;
- }
-
- DEFUN ("backward-char", Fbackward_char, Sbackward_char, 0, 2, "_p",
- "Move point left ARG characters (right if ARG negative).\n\
- On attempt to pass beginning or end of buffer, stop and signal error.\n\
- If BUFFER is nil, the current buffer is assumed.")
- (arg, buffer)
- Lisp_Object arg, buffer;
- {
- if (NILP (arg))
- arg = make_number (1);
- else
- CHECK_INT (arg, 0);
-
- XSETINT (arg, - XINT (arg));
- return Fforward_char (arg, buffer);
- }
-
- DEFUN ("forward-line", Fforward_line, Sforward_line, 0, 2, "_p",
- "Move ARG lines forward (backward if ARG is negative).\n\
- Precisely, if point is on line I, move to the start of line I + ARG.\n\
- If there isn't room, go as far as possible (no error).\n\
- Returns the count of lines left to move. If moving forward,\n\
- that is ARG - number of lines moved; if backward, ARG + number moved.\n\
- With positive ARG, a non-empty line at the end counts as one line\n\
- successfully moved (for the return value).\n\
- If BUFFER is nil, the current buffer is assumed.")
- (arg, buffer)
- Lisp_Object arg, buffer;
- {
- struct buffer *buf = decode_buffer (buffer, 1);
- Bufpos pos2 = BUF_PT (buf);
- Bufpos pos;
- int count, shortage, negp;
-
- if (NILP (arg))
- count = 1;
- else
- {
- CHECK_INT (arg, 0);
- count = XINT (arg);
- }
-
- negp = count <= 0;
- pos = scan_buffer (buf, '\n', pos2, 0, count - negp, &shortage, 1);
- if (shortage > 0
- && (negp
- || (BUF_ZV (buf) > BUF_BEGV (buf)
- && pos != pos2
- && BUF_FETCH_CHAR (buf, pos - 1) != '\n')))
- shortage--;
- BUF_SET_PT (buf, pos);
- return make_number (negp ? - shortage : shortage);
- }
-
- DEFUN ("beginning-of-line", Fbeginning_of_line, Sbeginning_of_line,
- 0, 2, "_p",
- "Move point to beginning of current line.\n\
- With argument ARG not nil or 1, move forward ARG - 1 lines first.\n\
- If scan reaches end of buffer, stop there without error.\n\
- If BUFFER is nil, the current buffer is assumed.")
- (arg, buffer)
- Lisp_Object arg, buffer;
- {
- struct buffer *b = decode_buffer (buffer, 1);
-
- XSETBUFFER (buffer, b);
- if (NILP (arg))
- arg = make_number (1);
- else
- CHECK_INT (arg, 0);
-
- Fforward_line (make_number (XINT (arg) - 1), buffer);
- return Qnil;
- }
-
- DEFUN ("end-of-line", Fend_of_line, Send_of_line,
- 0, 2, "_p",
- "Move point to end of current line.\n\
- With argument ARG not nil or 1, move forward ARG - 1 lines first.\n\
- If scan reaches end of buffer, stop there without error.\n\
- If BUFFER is nil, the current buffer is assumed.")
- (arg, buffer)
- Lisp_Object arg, buffer;
- {
- REGISTER Bufpos pos;
- REGISTER Bufpos stop;
- struct buffer *buf = decode_buffer (buffer, 1);
-
- XSETBUFFER (buffer, buf);
-
- if (NILP (arg))
- arg = make_number (1);
- else
- CHECK_INT (arg, 0);
-
- if (XINT (arg) != 1)
- Fforward_line (make_number (XINT (arg) - 1), buffer);
-
- pos = BUF_PT (buf);
- stop = BUF_ZV (buf);
- while (pos < stop && BUF_FETCH_CHAR (buf, pos) != '\n') pos++;
- BUF_SET_PT (buf, pos);
- return Qnil;
- }
-
- DEFUN ("delete-char", Fdelete_char, Sdelete_char, 1, 2, "*p\nP",
- "Delete the following ARG characters (previous, with negative arg).\n\
- Optional second arg KILLFLAG non-nil means kill instead (save in kill ring).\n\
- Interactively, ARG is the prefix arg, and KILLFLAG is set if\n\
- ARG was explicitly specified.")
- (arg, killflag)
- Lisp_Object arg, killflag;
- {
- /* This function can GC */
- Bufpos pos;
- struct buffer *buf = current_buffer;
-
- CHECK_INT (arg, 0);
-
- pos = BUF_PT (buf) + XINT (arg);
- if (NILP (killflag))
- {
- if (XINT (arg) < 0)
- {
- if (pos < BUF_BEGV (buf))
- signal_error (Qbeginning_of_buffer, Qnil);
- else
- buffer_delete_range (buf, pos, BUF_PT (buf), 0);
- }
- else
- {
- if (pos > BUF_ZV (buf))
- signal_error (Qend_of_buffer, Qnil);
- else
- buffer_delete_range (buf, BUF_PT (buf), pos, 0);
- }
- }
- else
- {
- call1 (Qkill_forward_chars, arg);
- }
- return Qnil;
- }
-
- DEFUN ("delete-backward-char", Fdelete_backward_char, Sdelete_backward_char,
- 1, 2, "*p\nP",
- "Delete the previous ARG characters (following, with negative ARG).\n\
- Optional second arg KILLFLAG non-nil means kill instead (save in kill ring).\n\
- Interactively, ARG is the prefix arg, and KILLFLAG is set if\n\
- ARG was explicitly specified.")
- (arg, killflag)
- Lisp_Object arg, killflag;
- {
- /* This function can GC */
- CHECK_INT (arg, 0);
- return Fdelete_char (make_number (-XINT (arg)), killflag);
- }
-
- static void internal_self_insert (Emchar ch, int noautofill);
-
- DEFUN ("self-insert-command", Fself_insert_command, Sself_insert_command, 1, 1, "*p",
- "Insert the character you type.\n\
- Whichever character you type to run this command is inserted.")
- (arg)
- Lisp_Object arg;
- {
- /* This function can GC */
- int n;
- Emchar ch;
- Lisp_Object c;
- CHECK_INT (arg, 0);
-
- if (INTP (Vlast_command_char))
- c = Vlast_command_char;
- else
- c = Fevent_to_character (Vlast_command_event, Qnil, Qnil, Qt);
-
- if (NILP (c))
- signal_simple_error ("last typed character has no ASCII equivalent",
- Fcopy_event (Vlast_command_event, Qnil));
-
- CHECK_COERCE_CHAR (c, 0);
-
- n = XINT (arg);
- ch = XINT (c);
- while (n > 0)
- {
- n--;
- internal_self_insert (ch, (n != 0));
- }
- return Qnil;
- }
-
- DEFUN ("newline", Fnewline, Snewline, 0, 1, "*P",
- "Insert a newline. With arg, insert that many newlines.\n\
- In Auto Fill mode, if no numeric arg, break the preceding line if it's long.")
- (arg1)
- Lisp_Object arg1;
- {
- /* This function can GC */
- int flag;
- int arg;
- char c1 = '\n';
- struct buffer *buf = current_buffer;
-
- arg = XINT (Fprefix_numeric_value (arg1));
-
- /* !!#### review this function. */
-
- barf_if_buffer_read_only (buf, BUF_PT (buf), -1);
-
- /* Inserting a newline at the end of a line produces better
- redisplay in try_window_id than inserting at the beginning of a
- line, and the textual result is the same. So, if we're at
- beginning of line, pretend to be at the end of the previous line.
-
- We can't use internal_self_insert in that case since it won't do
- the insertion correctly. Luckily, internal_self_insert's special
- features all do nothing in that case. */
-
- flag = BUF_PT (buf) > BUF_BEGV (buf) &&
- BUF_FETCH_CHAR (buf, BUF_PT (buf) - 1) == '\n';
- if (flag)
- BUF_SET_PT (buf, BUF_PT (buf) - 1);
-
- while (arg > 0)
- {
- if (flag)
- buffer_insert_c_char (current_buffer, c1);
- else
- internal_self_insert ('\n', !NILP (arg1));
- arg--;
- }
-
- if (flag)
- BUF_SET_PT (buf, BUF_PT (buf) + 1);
-
- return Qnil;
- }
-
- /* Insert character C1. If NOAUTOFILL is nonzero, don't do autofill
- even if it is enabled.
-
- FSF:
-
- If this insertion is suitable for direct output (completely simple),
- return 0. A value of 1 indicates this *might* not have been simple.
- A value of 2 means this did things that call for an undo boundary. */
-
- static void
- internal_self_insert (Emchar c1, int noautofill)
- {
- /* This function can GC */
- /* int hairy = 0; -- unused */
- REGISTER enum syntaxcode synt;
- REGISTER Emchar c2;
- Lisp_Object overwrite;
- Lisp_Object syntax_table;
- struct buffer *buf = current_buffer;
-
- overwrite = buf->overwrite_mode;
- syntax_table = buf->syntax_table;
-
- #if 0
- /* No, this is very bad, it makes undo *always* undo a character at a time
- instead of grouping consecutive self-inserts together. Nasty nasty.
- */
- if (!NILP (Vbefore_change_functions) || !NILP (Vafter_change_functions)
- || !NILP (Vbefore_change_function) || !NILP (Vafter_change_function))
- hairy = 1;
- #endif
-
- if (!NILP (overwrite)
- && BUF_PT (buf) < BUF_ZV (buf)
- && (EQ (overwrite, Qoverwrite_mode_binary)
- || (c1 != '\n' && BUF_FETCH_CHAR (buf, BUF_PT (buf)) != '\n'))
- && (EQ (overwrite, Qoverwrite_mode_binary)
- || BUF_FETCH_CHAR (buf, BUF_PT (buf)) != '\t'
- || XINT (buf->tab_width) <= 0
- || XINT (buf->tab_width) > 20
- || !((current_column (buf) + 1) % XINT (buf->tab_width))))
- {
- buffer_delete_range (buf, BUF_PT (buf), BUF_PT (buf) + 1, 0);
- /* hairy = 1; */
- }
-
- if (!NILP (buf->abbrev_mode)
- && SYNTAX (syntax_table, c1) != Sword
- && NILP (buf->read_only)
- && BUF_PT (buf) > BUF_BEGV (buf))
- {
- c2 = BUF_FETCH_CHAR (buf, BUF_PT (buf) - 1);
-
- if (SYNTAX (syntax_table, c2) == Sword)
- {
- /* int modiff = BUF_MODIFF (current_buffer); */
- Fexpand_abbrev ();
- /* We can't trust the value of Fexpand_abbrev,
- but if Fexpand_abbrev changed the buffer,
- assume it expanded something. */
- /* if (BUF_MODIFF (buf) != modiff)
- hairy = 2; */
- }
- }
- if ((c1 == ' ' || c1 == '\n')
- && !noautofill
- && !NILP (buf->auto_fill_function)
- && current_column (buf) > XINT (buf->fill_column))
- {
- if (c1 != '\n')
- buffer_insert_emacs_char (buf, c1);
- call0 (buf->auto_fill_function);
- if (c1 == '\n')
- buffer_insert_emacs_char (buf, c1);
- /* hairy = 1; */
- }
- else
- buffer_insert_emacs_char (buf, c1);
- synt = SYNTAX (syntax_table, c1);
- if ((synt == Sclose || synt == Smath)
- && !NILP (Vblink_paren_function) && INTERACTIVE)
- {
- call0 (Vblink_paren_function);
- /* hairy = 2; */
- }
- }
-
- /* (this comes from Mule but is a generally good idea) */
-
- DEFUN ("self-insert-internal", Fself_insert_internal, Sself_insert_internal,
- 1, 1, 0,
- "Invoke `self-insert-command' as if CH is entered from keyboard.")
- (ch)
- Lisp_Object ch;
- {
- /* This function can GC */
- CHECK_COERCE_CHAR (ch, 0);
- internal_self_insert (XINT (ch), 0);
- return Qnil;
- }
-
- /* module initialization */
-
- void
- syms_of_cmds (void)
- {
- defsymbol (&Qkill_forward_chars, "kill-forward-chars");
- defsymbol (&Qself_insert_command, "self-insert-command");
- defsymbol (&Qoverwrite_mode_binary, "overwrite-mode-binary");
-
- 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);
- defsubr (&Sself_insert_internal);
- defsubr (&Snewline);
- }
-
- void
- vars_of_cmds (void)
- {
- 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;
- }
-