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/* Simple built-in editing commands.
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   Copyright (C) 1985, 1993, 1994, 1995, 1996, 1997, 1998, 2001, 2002,
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                 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
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                 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 3 of the License, or
(at your option) any later version.
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GNU Emacs 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
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along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
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#include <config.h>
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#include <setjmp.h>
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#include "lisp.h"
#include "commands.h"
#include "buffer.h"
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#include "character.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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#include "keymap.h"
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#include "dispextern.h"
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#include "frame.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.  */
Lisp_Object Qoverwrite_mode_binary;

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/* Non-nil means put this face on the next self-inserting character.  */
Lisp_Object Vself_insert_face;

/* This is the command that set up Vself_insert_face.  */
Lisp_Object Vself_insert_face_command;

extern Lisp_Object Qface;
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extern Lisp_Object Vtranslation_table_for_input;
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DEFUN ("forward-point", Fforward_point, Sforward_point, 1, 1, 0,
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       doc: /* Return buffer position N characters after (before if N negative) point.  */)
     (n)
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     Lisp_Object n;
{
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  CHECK_NUMBER (n);
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  return make_number (PT + XINT (n));
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}

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DEFUN ("forward-char", Fforward_char, Sforward_char, 0, 1, "^p",
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       doc: /* Move point right N characters (left if N is negative).
On reaching end of buffer, stop and signal error.  */)
     (n)
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     Lisp_Object n;
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{
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  if (NILP (n))
    XSETFASTINT (n, 1);
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  else
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    CHECK_NUMBER (n);
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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
     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.  */
  {
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    int new_point = PT + XINT (n);
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    if (new_point < BEGV)
      {
	SET_PT (BEGV);
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	xsignal0 (Qbeginning_of_buffer);
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      }
    if (new_point > ZV)
      {
	SET_PT (ZV);
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	xsignal0 (Qend_of_buffer);
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      }

    SET_PT (new_point);
  }

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  return Qnil;
}

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DEFUN ("backward-char", Fbackward_char, Sbackward_char, 0, 1, "^p",
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       doc: /* Move point left N characters (right if N is negative).
On attempt to pass beginning or end of buffer, stop and signal error.  */)
     (n)
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     Lisp_Object n;
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{
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  if (NILP (n))
    XSETFASTINT (n, 1);
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  else
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    CHECK_NUMBER (n);
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  XSETINT (n, - XINT (n));
  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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       doc: /* Move N lines forward (backward if N is negative).
Precisely, if point is on line I, move to the start of line I + N.
If there isn't room, go as far as possible (no error).
Returns the count of lines left to move.  If moving forward,
that is N - number of lines moved; if backward, N + number moved.
With positive N, a non-empty line at the end counts as one line
  successfully moved (for the return value).  */)
     (n)
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     Lisp_Object n;
{
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  int opoint = PT, opoint_byte = PT_BYTE;
  int pos, pos_byte;
  int count, shortage;
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  if (NILP (n))
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    count = 1;
  else
    {
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      CHECK_NUMBER (n);
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      count = XINT (n);
    }

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  if (count <= 0)
    shortage = scan_newline (PT, PT_BYTE, BEGV, BEGV_BYTE, count - 1, 1);
  else
    shortage = scan_newline (PT, PT_BYTE, ZV, ZV_BYTE, count, 1);

  /* Since scan_newline does TEMP_SET_PT_BOTH,
     and we want to set PT "for real",
     go back to the old point and then come back here.  */
  pos = PT;
  pos_byte = PT_BYTE;
  TEMP_SET_PT_BOTH (opoint, opoint_byte);
  SET_PT_BOTH (pos, pos_byte);

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  if (shortage > 0
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      && (count <= 0
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	  || (ZV > BEGV
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	      && PT != opoint
	      && (FETCH_BYTE (PT_BYTE - 1) != '\n'))))
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    shortage--;
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  return make_number (count <= 0 ? - shortage : shortage);
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}

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DEFUN ("beginning-of-line", Fbeginning_of_line, Sbeginning_of_line, 0, 1, "^p",
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       doc: /* Move point to beginning of current line.
With argument N not nil or 1, move forward N - 1 lines first.
If point reaches the beginning or end of buffer, it stops there.

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This function constrains point to the current field unless this moves
point to a different line than the original, unconstrained result.  If
N is nil or 1, and a front-sticky field starts at point, the point
does not move.  To ignore field boundaries bind
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`inhibit-field-text-motion' to t, or use the `forward-line' function
instead.  For instance, `(forward-line 0)' does the same thing as
`(beginning-of-line)', except that it ignores field boundaries.  */)
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     (n)
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     Lisp_Object n;
{
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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);
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  SET_PT (XINT (Fline_beginning_position (n)));
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  return Qnil;
}

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DEFUN ("end-of-line", Fend_of_line, Send_of_line, 0, 1, "^p",
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       doc: /* Move point to end of current line.
With argument N not nil or 1, move forward N - 1 lines first.
If point reaches the beginning or end of buffer, it stops there.
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To ignore intangibility, bind `inhibit-point-motion-hooks' to t.
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This function constrains point to the current field unless this moves
point to a different line than the original, unconstrained result.  If
N is nil or 1, and a rear-sticky field ends at point, the point does
not move.  To ignore field boundaries bind `inhibit-field-text-motion'
to t.  */)
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     (n)
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     Lisp_Object n;
{
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  int newpos;

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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);
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  while (1)
    {
      newpos = XINT (Fline_end_position (n));
      SET_PT (newpos);

      if (PT > newpos
	  && FETCH_CHAR (PT - 1) == '\n')
	{
	  /* If we skipped over a newline that follows
	     an invisible intangible run,
	     move back to the last tangible position
	     within the line.  */

	  SET_PT (PT - 1);
	  break;
	}
      else if (PT > newpos && PT < ZV
	       && FETCH_CHAR (PT) != '\n')
	/* If we skipped something intangible
	   and now we're not really at eol,
	   keep going.  */
	n = make_number (1);
      else
	break;
    }
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  return Qnil;
}

DEFUN ("delete-char", Fdelete_char, Sdelete_char, 1, 2, "p\nP",
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       doc: /* Delete the following N characters (previous if N is negative).
Optional second arg KILLFLAG non-nil means kill instead (save in kill ring).
Interactively, N is the prefix arg, and KILLFLAG is set if
N was explicitly specified.  */)
     (n, killflag)
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     Lisp_Object n, killflag;
{
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  int pos;

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  CHECK_NUMBER (n);
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  pos = PT + XINT (n);
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  if (NILP (killflag))
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    {
      if (XINT (n) < 0)
	{
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	  if (pos < BEGV)
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	    xsignal0 (Qbeginning_of_buffer);
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	  else
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	    del_range (pos, PT);
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	}
      else
	{
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	  if (pos > ZV)
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	    xsignal0 (Qend_of_buffer);
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	  else
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	    del_range (PT, pos);
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	}
    }
  else
    {
      call1 (Qkill_forward_chars, n);
    }
  return Qnil;
}

DEFUN ("delete-backward-char", Fdelete_backward_char, Sdelete_backward_char,
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       1, 2, "p\nP",
       doc: /* Delete the previous N characters (following if N is negative).
Optional second arg KILLFLAG non-nil means kill instead (save in kill ring).
Interactively, N is the prefix arg, and KILLFLAG is set if
N was explicitly specified.  */)
     (n, killflag)
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     Lisp_Object n, killflag;
{
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  Lisp_Object value;
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  int deleted_special = 0;
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  int pos, pos_byte, i;
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  CHECK_NUMBER (n);
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  /* See if we are about to delete a tab or newline backwards.  */
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  pos = PT;
  pos_byte = PT_BYTE;
  for (i = 0; i < XINT (n) && pos_byte > BEGV_BYTE; i++)
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    {
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      int c;

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      DEC_BOTH (pos, pos_byte);
      c = FETCH_BYTE (pos_byte);
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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;
	}
    }

  /* In overwrite mode, back over columns while clearing them out,
     unless at end of line.  */
  if (XINT (n) > 0
      && ! NILP (current_buffer->overwrite_mode)
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      && ! deleted_special
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      && ! (PT == ZV || FETCH_BYTE (PT_BYTE) == '\n'))
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    {
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      int column = (int) current_column (); /* iftc */
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      value = Fdelete_char (make_number (-XINT (n)), killflag);
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      i = column - (int) current_column (); /* iftc */
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      Finsert_char (make_number (' '), make_number (i), Qnil);
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      /* Whitespace chars are ASCII chars, so we can simply subtract.  */
      SET_PT_BOTH (PT - i, PT_BYTE - i);
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    }
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  else
    value = Fdelete_char (make_number (-XINT (n)), killflag);
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  return value;
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}

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int nonundocount;

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/* Note that there's code in command_loop_1 which typically avoids
   calling this.  */
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DEFUN ("self-insert-command", Fself_insert_command, Sself_insert_command, 1, 1, "p",
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       doc: /* Insert the character you type.
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Whichever character you type to run this command is inserted.
Before insertion, `expand-abbrev' is executed if the inserted character does
not have word syntax and the previous character in the buffer does.
After insertion, the value of `auto-fill-function' is called if the
`auto-fill-chars' table has a non-nil value for the inserted character.  */)
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     (n)
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     Lisp_Object n;
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{
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  int remove_boundary = 1;
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  CHECK_NUMBER (n);
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  if (!EQ (Vthis_command, current_kboard->Vlast_command))
    nonundocount = 0;

  if (NILP (Vexecuting_kbd_macro)
      && !EQ (minibuf_window, selected_window))
    {
      if (nonundocount <= 0 || nonundocount >= 20)
	{
	  remove_boundary = 0;
	  nonundocount = 0;
	}
      nonundocount++;
    }

  if (remove_boundary
      && CONSP (current_buffer->undo_list)
      && NILP (XCAR (current_buffer->undo_list)))
    /* Remove the undo_boundary that was just pushed.  */
    current_buffer->undo_list = XCDR (current_buffer->undo_list);
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  /* Barf if the key that invoked this was not a character.  */
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  if (!CHARACTERP (last_command_event))
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    bitch_at_user ();
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  {
    int character = translate_char (Vtranslation_table_for_input,
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				    XINT (last_command_event));
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    if (XINT (n) >= 2 && NILP (current_buffer->overwrite_mode))
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      {
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	XSETFASTINT (n, XFASTINT (n) - 2);
	/* The first one might want to expand an abbrev.  */
	internal_self_insert (character, 1);
	/* The bulk of the copies of this char can be inserted simply.
	   We don't have to handle a user-specified face specially
	   because it will get inherited from the first char inserted.  */
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	Finsert_char (make_number (character), n, Qt);
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	/* The last one might want to auto-fill.  */
	internal_self_insert (character, 0);
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      }
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    else
      while (XINT (n) > 0)
	{
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	  int val;
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	  /* Ok since old and new vals both nonneg */
	  XSETFASTINT (n, XFASTINT (n) - 1);
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	  val = internal_self_insert (character, XFASTINT (n) != 0);
	  if (val == 2)
	    nonundocount = 0;
	  frame_make_pointer_invisible ();
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	}
  }
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  return Qnil;
}

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/* Insert character C.  If NOAUTOFILL is nonzero, don't do autofill
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   even if it is enabled.

   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.
   A value of 2 means this did things that call for an undo boundary.  */
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static Lisp_Object Qexpand_abbrev;

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int
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internal_self_insert (c, noautofill)
     int c;
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     int noautofill;
{
  int hairy = 0;
  Lisp_Object tem;
  register enum syntaxcode synt;
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  Lisp_Object overwrite, string;
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  /* Length of multi-byte form of C.  */
  int len;
  /* Working buffer and pointer for multi-byte form of C.  */
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  unsigned char str[MAX_MULTIBYTE_LENGTH];
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  int chars_to_delete = 0;
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  int spaces_to_insert = 0;
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  overwrite = current_buffer->overwrite_mode;
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  if (!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.  */
  if (!NILP (current_buffer->enable_multibyte_characters))
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    {
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      len = CHAR_STRING (c, str);
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      if (len == 1)
	/* If C has modifier bits, this makes C an appropriate
           one-byte char.  */
	c = *str;
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    }
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  else
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    {
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      str[0] = (SINGLE_BYTE_CHAR_P (c)
		? c
		: multibyte_char_to_unibyte (c, Qnil));
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      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,
	 hereafter) by C.  For that, we delete C2 in advance.  But,
	 just substituting C2 by C may move a remaining text in the
	 line to the right or to the left, which is not preferable.
	 So we insert more spaces or delete more characters in the
	 following cases: if C is narrower than C2, after deleting C2,
	 we fill columns with spaces, if C is wider than C2, we delete
	 C2 and several characters following C2.  */

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      /* This is the character after point.  */
      int c2 = FETCH_CHAR (PT_BYTE);

      /* Column the cursor should be placed at after this insertion.
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         The correct value should be calculated only when necessary.  */
      int target_clm = 0;

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      /* Overwriting in binary-mode always replaces C2 by C.
	 Overwriting in textual-mode doesn't always do that.
	 It inserts newlines in the usual way,
	 and inserts any character at end of line
	 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)
	  || (c != '\n'
	      && c2 != '\n'
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	      && ! (c2 == '\t'
		    && XINT (current_buffer->tab_width) > 0
		    && XFASTINT (current_buffer->tab_width) < 20
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		    && (target_clm = ((int) current_column () /* iftc */
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				      + XINT (Fchar_width (make_number (c)))),
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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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	  int pos_byte = PT_BYTE;
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	  if (target_clm == 0)
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	    chars_to_delete = 1;
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	  else
	    {
	      /* The actual cursor position after the trial of moving
		 to column TARGET_CLM.  It is greater than TARGET_CLM
		 if the TARGET_CLM is middle of multi-column
		 character.  In that case, the new point is set after
		 that character.  */
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	      int actual_clm
		= XFASTINT (Fmove_to_column (make_number (target_clm), Qnil));
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	      chars_to_delete = PT - pos;
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	      if (actual_clm > target_clm)
		{
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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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	  SET_PT_BOTH (pos, pos_byte);
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	  hairy = 2;
	}
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      hairy = 2;
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    }
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  synt = SYNTAX (c);

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  if (!NILP (current_buffer->abbrev_mode)
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      && synt != Sword
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      && NILP (current_buffer->read_only)
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      && PT > BEGV
      && (!NILP (current_buffer->enable_multibyte_characters)
	  ? SYNTAX (XFASTINT (Fprevious_char ())) == Sword
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	  : (SYNTAX (UNIBYTE_TO_CHAR (XFASTINT (Fprevious_char ())))
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	     == Sword)))
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    {
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      int modiff = MODIFF;
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      Lisp_Object sym;

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      sym = call0 (Qexpand_abbrev);
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      /* If we expanded an abbrev which has 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 (SYMBOLP (sym) && ! NILP (sym) && ! NILP (XSYMBOL (sym)->function)
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	  && SYMBOLP (XSYMBOL (sym)->function))
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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 (chars_to_delete)
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    {
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      string = make_string_from_bytes (str, 1, len);
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      if (spaces_to_insert)
	{
	  tem = Fmake_string (make_number (spaces_to_insert),
			      make_number (' '));
	  string = concat2 (tem, string);
	}

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      replace_range (PT, PT + chars_to_delete, string, 1, 1, 1);
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      Fforward_char (make_number (1 + spaces_to_insert));
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    }
  else
    insert_and_inherit (str, len);

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  if ((CHAR_TABLE_P (Vauto_fill_chars)
       ? !NILP (CHAR_TABLE_REF (Vauto_fill_chars, c))
       : (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
	   that.  Must have the newline in place already so filling and
	   justification, if any, know where the end is going to be.  */
	SET_PT_BOTH (PT - 1, PT_BYTE - 1);
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      tem = call0 (current_buffer->auto_fill_function);
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      /* Test PT < ZV in case the auto-fill-function is strange.  */
      if (c == '\n' && PT < ZV)
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	SET_PT_BOTH (PT + 1, PT_BYTE + 1);
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      if (!NILP (tem))
	hairy = 2;
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    }
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  /* If previous command specified a face to use, use it.  */
  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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      Fput_text_property (make_number (PT - 1), make_number (PT),
			  Qface, Vself_insert_face, Qnil);
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      Vself_insert_face = Qnil;
    }
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  if ((synt == Sclose || synt == Smath)
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      && !NILP (Vblink_paren_function) && INTERACTIVE
      && !noautofill)
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    {
      call0 (Vblink_paren_function);
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      hairy = 2;
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    }
  return hairy;
}

/* module initialization */

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void
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syms_of_cmds ()
{
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  Qkill_backward_chars = intern_c_string ("kill-backward-chars");
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  staticpro (&Qkill_backward_chars);

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  Qkill_forward_chars = intern_c_string ("kill-forward-chars");
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  staticpro (&Qkill_forward_chars);

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  Qoverwrite_mode_binary = intern_c_string ("overwrite-mode-binary");
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  staticpro (&Qoverwrite_mode_binary);
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  Qexpand_abbrev = intern_c_string ("expand-abbrev");
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  staticpro (&Qexpand_abbrev);

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  DEFVAR_LISP ("self-insert-face", &Vself_insert_face,
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	       doc: /* If non-nil, set the face of the next self-inserting character to this.
See also `self-insert-face-command'.  */);
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  Vself_insert_face = Qnil;

  DEFVAR_LISP ("self-insert-face-command", &Vself_insert_face_command,
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	       doc: /* This is the command that set up `self-insert-face'.
If `last-command' does not equal this value, we ignore `self-insert-face'.  */);
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  Vself_insert_face_command = Qnil;

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  DEFVAR_LISP ("blink-paren-function", &Vblink_paren_function,
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	       doc: /* Function called, if non-nil, whenever a close parenthesis is inserted.
More precisely, a char with closeparen syntax is self-inserted.  */);
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  Vblink_paren_function = Qnil;

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  defsubr (&Sforward_point);
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  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);
}

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void
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keys_of_cmds ()
{
  int n;

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  nonundocount = 0;
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  initial_define_key (global_map, Ctl ('I'), "self-insert-command");
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  for (n = 040; n < 0177; n++)
    initial_define_key (global_map, n, "self-insert-command");
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#ifdef MSDOS
  for (n = 0200; n < 0240; n++)
    initial_define_key (global_map, n, "self-insert-command");
#endif
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  for (n = 0240; n < 0400; n++)
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    initial_define_key (global_map, n, "self-insert-command");
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  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");
}
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/* arch-tag: 022ba3cd-67f9-4978-9c5d-7d2b18d8644e
   (do not change this comment) */