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351 lines
7.7 KiB
C
351 lines
7.7 KiB
C
/* wordproc.c - word-processor mode for the editor: does dynamic
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paragraph formatting.
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Copyright (C) 1996 Paul Sheer
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This program 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 of the License, or
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(at your option) any later version.
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This program 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 this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <config.h>
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#include "edit.h"
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#ifdef MIDNIGHT
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#define tab_width option_tab_spacing
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#endif
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int line_is_blank (WEdit * edit, long line);
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#define NO_FORMAT_CHARS_START "-+*\\,.;:&>"
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static long line_start (WEdit * edit, long line)
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{
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static long p = -1, l = 0;
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int c;
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if (p == -1 || abs (l - line) > abs (edit->curs_line - line)) {
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l = edit->curs_line;
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p = edit->curs1;
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}
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if (line < l)
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p = edit_move_backward (edit, p, l - line);
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else if (line > l)
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p = edit_move_forward (edit, p, line - l, 0);
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l = line;
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p = edit_bol (edit, p);
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while (strchr ("\t ", c = edit_get_byte (edit, p)))
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p++;
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return p;
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}
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static int bad_line_start (WEdit * edit, long p)
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{
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int c;
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c = edit_get_byte (edit, p);
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if (c == '.') { /* `...' is acceptable */
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if (edit_get_byte (edit, p + 1) == '.')
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if (edit_get_byte (edit, p + 2) == '.')
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return 0;
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return 1;
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}
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if (c == '-') {
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if (edit_get_byte (edit, p + 1) == '-')
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if (edit_get_byte (edit, p + 2) == '-')
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return 0; /* `---' is acceptable */
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return 1;
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}
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if (strchr (NO_FORMAT_CHARS_START, c))
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return 1;
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return 0;
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}
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static long begin_paragraph (WEdit * edit, long p, int force)
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{
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int i;
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for (i = edit->curs_line - 1; i > 0; i--) {
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if (line_is_blank (edit, i)) {
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i++;
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break;
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}
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if (force) {
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if (bad_line_start (edit, line_start (edit, i))) {
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i++;
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break;
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}
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}
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}
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return edit_move_backward (edit, edit_bol (edit, edit->curs1), edit->curs_line - i);
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}
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static long end_paragraph (WEdit * edit, long p, int force)
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{
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int i;
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for (i = edit->curs_line + 1; i < edit->total_lines; i++) {
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if (line_is_blank (edit, i)) {
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i--;
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break;
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}
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if (force)
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if (bad_line_start (edit, line_start (edit, i))) {
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i--;
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break;
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}
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}
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return edit_eol (edit, edit_move_forward (edit, edit_bol (edit, edit->curs1), i - edit->curs_line, 0));
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}
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static char *get_paragraph (WEdit * edit, long p, long q, int indent, int *size)
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{
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char *s, *t;
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t = malloc ((q - p) + 2 * (q - p) / option_word_wrap_line_length + 10);
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if (!t)
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return 0;
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for (s = t; p < q; p++, s++) {
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if (indent)
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if (edit_get_byte (edit, p - 1) == '\n')
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while (strchr ("\t ", edit_get_byte (edit, p)))
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p++;
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*s = edit_get_byte (edit, p);
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}
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*size = (unsigned long) s - (unsigned long) t;
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t[*size] = '\n';
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return t;
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}
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static void strip_newlines (char *t, int size)
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{
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char *p = t;
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while (size--) {
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*p = *p == '\n' ? ' ' : *p;
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p++;
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}
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}
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#ifndef MIDNIGHT
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int edit_width_of_long_printable (int c);
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#endif
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/*
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This is a copy of the function
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int calc_text_pos (WEdit * edit, long b, long *q, int l)
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in propfont.c :(
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It calculates the number of chars in a line specified to length l in pixels
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*/
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extern int tab_width;
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static inline int next_tab_pos (int x)
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{
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return x += tab_width - x % tab_width;
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}
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static int line_pixel_length (char *t, long b, int l)
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{
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int x = 0, c, xn = 0;
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for (;;) {
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c = t[b];
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switch (c) {
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case '\n':
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return b;
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case '\t':
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xn = next_tab_pos (x);
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break;
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default:
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#ifdef MIDNIGHT
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xn = x + 1;
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#else
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xn = x + edit_width_of_long_printable (c);
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#endif
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break;
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}
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if (xn > l)
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break;
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x = xn;
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b++;
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}
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return b;
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}
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/* find the start of a word */
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static int next_word_start (char *t, int q, int size)
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{
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int i;
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for (i = q;; i++) {
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switch (t[i]) {
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case '\n':
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return -1;
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case '\t':
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case ' ':
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for (;; i++) {
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if (t[i] == '\n')
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return -1;
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if (t[i] != ' ' && t[i] != '\t')
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return i;
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}
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break;
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}
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}
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}
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/* find the start of a word */
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static int word_start (char *t, int q, int size)
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{
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int i = q;
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if (t[q] == ' ' || t[q] == '\t')
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return next_word_start (t, q, size);
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for (;;) {
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int c;
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if (!i)
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return -1;
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c = t[i - 1];
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if (c == '\n')
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return -1;
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if (c == ' ' || c == '\t')
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return i;
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i--;
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}
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}
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/* replaces ' ' with '\n' to properly format a paragraph */
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static void format_this (char *t, int size, int indent)
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{
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int q = 0, ww;
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strip_newlines (t, size);
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ww = option_word_wrap_line_length * FONT_MEAN_WIDTH - indent;
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if (ww < FONT_MEAN_WIDTH * 2)
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ww = FONT_MEAN_WIDTH * 2;
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for (;;) {
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int p;
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q = line_pixel_length (t, q, ww);
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if (q > size)
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break;
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if (t[q] == '\n')
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break;
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p = word_start (t, q, size);
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if (p == -1)
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q = next_word_start (t, q, size); /* Return the end of the word if the beginning
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of the word is at the beginning of a line
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(i.e. a very long word) */
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else
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q = p;
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if (q == -1) /* end of paragraph */
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break;
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if (q)
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t[q - 1] = '\n';
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}
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}
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static void replace_at (WEdit * edit, long q, int c)
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{
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edit_cursor_move (edit, q - edit->curs1);
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edit_delete (edit);
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edit_insert_ahead (edit, c);
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}
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void edit_insert_indent (WEdit * edit, int indent);
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/* replaces a block of text */
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static void put_paragraph (WEdit * edit, char *t, long p, long q, int indent, int size)
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{
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long cursor;
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int i, c = 0;
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cursor = edit->curs1;
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if (indent)
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while (strchr ("\t ", edit_get_byte (edit, p)))
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p++;
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for (i = 0; i < size; i++, p++) {
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if (i && indent) {
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if (t[i - 1] == '\n' && c == '\n') {
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while (strchr ("\t ", edit_get_byte (edit, p)))
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p++;
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} else if (t[i - 1] == '\n') {
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long curs;
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edit_cursor_move (edit, p - edit->curs1);
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curs = edit->curs1;
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edit_insert_indent (edit, indent);
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if (cursor >= curs)
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cursor += edit->curs1 - p;
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p = edit->curs1;
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} else if (c == '\n') {
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edit_cursor_move (edit, p - edit->curs1);
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while (strchr ("\t ", edit_get_byte (edit, p))) {
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edit_delete (edit);
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if (cursor > edit->curs1)
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cursor--;
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}
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p = edit->curs1;
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}
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}
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c = edit_get_byte (edit, p);
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if (c != t[i])
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replace_at (edit, p, t[i]);
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}
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edit_cursor_move (edit, cursor - edit->curs1); /* restore cursor position */
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}
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int edit_indent_width (WEdit * edit, long p);
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static int test_indent (WEdit * edit, long p, long q)
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{
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int indent;
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indent = edit_indent_width (edit, p++);
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if (!indent)
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return 0;
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for (; p < q; p++)
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if (edit_get_byte (edit, p - 1) == '\n')
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if (indent != edit_indent_width (edit, p))
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return 0;
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return indent;
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}
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void format_paragraph (WEdit * edit, int force)
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{
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long p, q;
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int size;
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char *t;
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int indent = 0;
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if (option_word_wrap_line_length < 2)
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return;
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if (line_is_blank (edit, edit->curs_line))
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return;
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p = begin_paragraph (edit, edit->curs1, force);
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q = end_paragraph (edit, edit->curs1, force);
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indent = test_indent (edit, p, q);
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t = get_paragraph (edit, p, q, indent, &size);
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if (!t)
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return;
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if (!force) {
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int i;
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if (strchr (NO_FORMAT_CHARS_START, *t)) {
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free (t);
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return;
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}
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for (i = 0; i < size - 1; i++) {
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if (t[i] == '\n') {
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if (strchr (NO_FORMAT_CHARS_START "\t ", t[i + 1])) {
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free (t);
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return;
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}
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}
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}
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}
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format_this (t, q - p, indent);
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put_paragraph (edit, t, p, q, indent, size);
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free (t);
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}
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