| 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 bytepos; |
| 43 | int hpos; |
| 44 | int vpos; |
| 45 | int prevhpos; |
| 46 | int contin; |
| 47 | /* Number of characters we have already handled |
| 48 | from the before and after strings at this position. */ |
| 49 | int ovstring_chars_done; |
| 50 | int tab_offset; |
| 51 | }; |
| 52 | |
| 53 | struct position *compute_motion (); |
| 54 | struct position *vmotion (); |
| 55 | |
| 56 | /* Value of point when current_column was called */ |
| 57 | extern int last_known_column_point; |
| 58 | |
| 59 | /* Functions for dealing with the column cache. */ |
| 60 | |
| 61 | /* Return true iff the display table DISPTAB specifies the same widths |
| 62 | for characters as WIDTHTAB. We use this to decide when to |
| 63 | invalidate the buffer's column_cache. */ |
| 64 | extern int disptab_matches_widthtab ( /* struct Lisp_Vector *disptab, |
| 65 | struct Lisp_Vector *widthtab */ ); |
| 66 | |
| 67 | /* Recompute BUF's width table, using the display table DISPTAB. */ |
| 68 | extern void recompute_width_table ( /* struct buffer *buf, |
| 69 | struct Lisp_Vector *disptab */ ); |