src/indent.h

   1 /* Definitions for interface to indent.c
   2    Copyright (C) 1985, 1986 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 /* We introduce new member `tab_offset'.  We need it because of the
  22    existence of wide-column characters.  There is a case that the
  23    line-break occurs at a wide-column character and the number of
  24    colums of the line gets less than width.
  25
  26    Example (where W_ stands for a wide-column character):
  27              ----------
  28              abcdefgh\\
  29              W_
  30              ----------
  31
  32    To handle this case, we should not calculate the tab offset by
  33         tab_offset += width;
  34
  35    Instead, we must remember tab_offset of the line.
  36
  37  */
  38
  39 struct position
  40   {
  41     int bufpos;
  42     int hpos;
  43     int vpos;
  44     int prevhpos;
  45     int contin;
  46     /* Number of characters we have already handled
  47        from the before and after strings at this position.  */
  48     int ovstring_chars_done;
  49     int tab_offset;
  50   };
  51
  52 struct position *compute_motion ();
  53 struct position *vmotion ();
  54
  55 /* Value of point when current_column was called */
  56 extern int last_known_column_point;
  57
  58 /* Functions for dealing with the column cache.  */
  59
  60 /* Return true iff the display table DISPTAB specifies the same widths
  61    for characters as WIDTHTAB.  We use this to decide when to
  62    invalidate the buffer's column_cache.  */
  63 extern int disptab_matches_widthtab ( /* struct Lisp_Vector *disptab,
  64                                          struct Lisp_Vector *widthtab */ );
  65
  66 /* Recompute BUF's width table, using the display table DISPTAB.  */
  67 extern void recompute_width_table ( /* struct buffer *buf,
  68                                        struct Lisp_Vector *disptab */ );