mirror of
https://github.com/MidnightCommander/mc
synced 2024-12-22 20:36:50 +03:00
346 lines
7.7 KiB
C
346 lines
7.7 KiB
C
/* wordproc.c - word-processor mode for the editor: does dynamic
|
|
paragraph formatting.
|
|
Copyright (C) 1996 Paul Sheer
|
|
|
|
This program 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 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program 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 this program; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307, USA.
|
|
*/
|
|
|
|
#include <config.h>
|
|
#include "edit.h"
|
|
|
|
#define tab_width option_tab_spacing
|
|
|
|
#define NO_FORMAT_CHARS_START "-+*\\,.;:&>"
|
|
|
|
static long
|
|
line_start (WEdit *edit, long line)
|
|
{
|
|
long p, l;
|
|
|
|
l = edit->curs_line;
|
|
p = edit->curs1;
|
|
|
|
if (line < l)
|
|
p = edit_move_backward (edit, p, l - line);
|
|
else if (line > l)
|
|
p = edit_move_forward (edit, p, line - l, 0);
|
|
|
|
p = edit_bol (edit, p);
|
|
while (strchr ("\t ", edit_get_byte (edit, p)))
|
|
p++;
|
|
return p;
|
|
}
|
|
|
|
static int bad_line_start (WEdit * edit, long p)
|
|
{
|
|
int c;
|
|
c = edit_get_byte (edit, p);
|
|
if (c == '.') { /* `...' is acceptable */
|
|
if (edit_get_byte (edit, p + 1) == '.')
|
|
if (edit_get_byte (edit, p + 2) == '.')
|
|
return 0;
|
|
return 1;
|
|
}
|
|
if (c == '-') {
|
|
if (edit_get_byte (edit, p + 1) == '-')
|
|
if (edit_get_byte (edit, p + 2) == '-')
|
|
return 0; /* `---' is acceptable */
|
|
return 1;
|
|
}
|
|
if (strchr (NO_FORMAT_CHARS_START, c))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Find the start of the current paragraph for the purpose of formatting.
|
|
* Return position in the file.
|
|
*/
|
|
static long
|
|
begin_paragraph (WEdit *edit, int force)
|
|
{
|
|
int i;
|
|
for (i = edit->curs_line - 1; i >= 0; i--) {
|
|
if (line_is_blank (edit, i)) {
|
|
i++;
|
|
break;
|
|
}
|
|
if (force) {
|
|
if (bad_line_start (edit, line_start (edit, i))) {
|
|
i++;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return edit_move_backward (edit, edit_bol (edit, edit->curs1),
|
|
edit->curs_line - i);
|
|
}
|
|
|
|
/*
|
|
* Find the end of the current paragraph for the purpose of formatting.
|
|
* Return position in the file.
|
|
*/
|
|
static long
|
|
end_paragraph (WEdit *edit, int force)
|
|
{
|
|
int i;
|
|
for (i = edit->curs_line + 1; i <= edit->total_lines; i++) {
|
|
if (line_is_blank (edit, i)) {
|
|
i--;
|
|
break;
|
|
}
|
|
if (force)
|
|
if (bad_line_start (edit, line_start (edit, i))) {
|
|
i--;
|
|
break;
|
|
}
|
|
}
|
|
return edit_eol (edit,
|
|
edit_move_forward (edit, edit_bol (edit, edit->curs1),
|
|
i - edit->curs_line, 0));
|
|
}
|
|
|
|
static unsigned char *get_paragraph (WEdit * edit, long p, long q, int indent, int *size)
|
|
{
|
|
unsigned char *s, *t;
|
|
#if 0
|
|
t = malloc ((q - p) + 2 * (q - p) / option_word_wrap_line_length + 10);
|
|
#else
|
|
t = malloc (2 * (q - p) + 100);
|
|
#endif
|
|
if (!t)
|
|
return 0;
|
|
for (s = t; p < q; p++, s++) {
|
|
if (indent)
|
|
if (edit_get_byte (edit, p - 1) == '\n')
|
|
while (strchr ("\t ", edit_get_byte (edit, p)))
|
|
p++;
|
|
*s = edit_get_byte (edit, p);
|
|
}
|
|
*size = (unsigned long) s - (unsigned long) t;
|
|
t[*size] = '\n';
|
|
return t;
|
|
}
|
|
|
|
static void strip_newlines (unsigned char *t, int size)
|
|
{
|
|
unsigned char *p = t;
|
|
while (size--) {
|
|
*p = *p == '\n' ? ' ' : *p;
|
|
p++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
This is a copy of the function
|
|
int calc_text_pos (WEdit * edit, long b, long *q, int l)
|
|
in propfont.c :(
|
|
It calculates the number of chars in a line specified to length l in pixels
|
|
*/
|
|
static inline int next_tab_pos (int x)
|
|
{
|
|
return x += tab_width - x % tab_width;
|
|
}
|
|
static int line_pixel_length (unsigned char *t, long b, int l)
|
|
{
|
|
int x = 0, c, xn = 0;
|
|
for (;;) {
|
|
c = t[b];
|
|
switch (c) {
|
|
case '\n':
|
|
return b;
|
|
case '\t':
|
|
xn = next_tab_pos (x);
|
|
break;
|
|
default:
|
|
xn = x + 1;
|
|
break;
|
|
}
|
|
if (xn > l)
|
|
break;
|
|
x = xn;
|
|
b++;
|
|
}
|
|
return b;
|
|
}
|
|
|
|
/* find the start of a word */
|
|
static int next_word_start (unsigned char *t, int q, int size)
|
|
{
|
|
int i;
|
|
for (i = q;; i++) {
|
|
switch (t[i]) {
|
|
case '\n':
|
|
return -1;
|
|
case '\t':
|
|
case ' ':
|
|
for (;; i++) {
|
|
if (t[i] == '\n')
|
|
return -1;
|
|
if (t[i] != ' ' && t[i] != '\t')
|
|
return i;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* find the start of a word */
|
|
static int word_start (unsigned char *t, int q, int size)
|
|
{
|
|
int i = q;
|
|
if (t[q] == ' ' || t[q] == '\t')
|
|
return next_word_start (t, q, size);
|
|
for (;;) {
|
|
int c;
|
|
if (!i)
|
|
return -1;
|
|
c = t[i - 1];
|
|
if (c == '\n')
|
|
return -1;
|
|
if (c == ' ' || c == '\t')
|
|
return i;
|
|
i--;
|
|
}
|
|
}
|
|
|
|
/* replaces ' ' with '\n' to properly format a paragraph */
|
|
static void format_this (unsigned char *t, int size, int indent)
|
|
{
|
|
int q = 0, ww;
|
|
strip_newlines (t, size);
|
|
ww = option_word_wrap_line_length * FONT_MEAN_WIDTH - indent;
|
|
if (ww < FONT_MEAN_WIDTH * 2)
|
|
ww = FONT_MEAN_WIDTH * 2;
|
|
for (;;) {
|
|
int p;
|
|
q = line_pixel_length (t, q, ww);
|
|
if (q > size)
|
|
break;
|
|
if (t[q] == '\n')
|
|
break;
|
|
p = word_start (t, q, size);
|
|
if (p == -1)
|
|
q = next_word_start (t, q, size); /* Return the end of the word if the beginning
|
|
of the word is at the beginning of a line
|
|
(i.e. a very long word) */
|
|
else
|
|
q = p;
|
|
if (q == -1) /* end of paragraph */
|
|
break;
|
|
if (q)
|
|
t[q - 1] = '\n';
|
|
}
|
|
}
|
|
|
|
static void replace_at (WEdit * edit, long q, int c)
|
|
{
|
|
edit_cursor_move (edit, q - edit->curs1);
|
|
edit_delete (edit);
|
|
edit_insert_ahead (edit, c);
|
|
}
|
|
|
|
/* replaces a block of text */
|
|
static void put_paragraph (WEdit * edit, unsigned char *t, long p, long q, int indent, int size)
|
|
{
|
|
long cursor;
|
|
int i, c = 0;
|
|
cursor = edit->curs1;
|
|
if (indent)
|
|
while (strchr ("\t ", edit_get_byte (edit, p)))
|
|
p++;
|
|
for (i = 0; i < size; i++, p++) {
|
|
if (i && indent) {
|
|
if (t[i - 1] == '\n' && c == '\n') {
|
|
while (strchr ("\t ", edit_get_byte (edit, p)))
|
|
p++;
|
|
} else if (t[i - 1] == '\n') {
|
|
long curs;
|
|
edit_cursor_move (edit, p - edit->curs1);
|
|
curs = edit->curs1;
|
|
edit_insert_indent (edit, indent);
|
|
if (cursor >= curs)
|
|
cursor += edit->curs1 - p;
|
|
p = edit->curs1;
|
|
} else if (c == '\n') {
|
|
edit_cursor_move (edit, p - edit->curs1);
|
|
while (strchr ("\t ", edit_get_byte (edit, p))) {
|
|
edit_delete (edit);
|
|
if (cursor > edit->curs1)
|
|
cursor--;
|
|
}
|
|
p = edit->curs1;
|
|
}
|
|
}
|
|
c = edit_get_byte (edit, p);
|
|
if (c != t[i])
|
|
replace_at (edit, p, t[i]);
|
|
}
|
|
edit_cursor_move (edit, cursor - edit->curs1); /* restore cursor position */
|
|
}
|
|
|
|
static int test_indent (WEdit * edit, long p, long q)
|
|
{
|
|
int indent;
|
|
indent = edit_indent_width (edit, p++);
|
|
if (!indent)
|
|
return 0;
|
|
for (; p < q; p++)
|
|
if (edit_get_byte (edit, p - 1) == '\n')
|
|
if (indent != edit_indent_width (edit, p))
|
|
return 0;
|
|
return indent;
|
|
}
|
|
|
|
void format_paragraph (WEdit * edit, int force)
|
|
{
|
|
long p, q;
|
|
int size;
|
|
unsigned char *t;
|
|
int indent = 0;
|
|
if (option_word_wrap_line_length < 2)
|
|
return;
|
|
if (line_is_blank (edit, edit->curs_line))
|
|
return;
|
|
p = begin_paragraph (edit, force);
|
|
q = end_paragraph (edit, force);
|
|
indent = test_indent (edit, p, q);
|
|
t = get_paragraph (edit, p, q, indent, &size);
|
|
if (!t)
|
|
return;
|
|
if (!force) {
|
|
int i;
|
|
if (strchr (NO_FORMAT_CHARS_START, *t)) {
|
|
free (t);
|
|
return;
|
|
}
|
|
for (i = 0; i < size - 1; i++) {
|
|
if (t[i] == '\n') {
|
|
if (strchr (NO_FORMAT_CHARS_START "\t ", t[i + 1])) {
|
|
free (t);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
format_this (t, q - p, indent);
|
|
put_paragraph (edit, t, p, q, indent, size);
|
|
free (t);
|
|
|
|
/* Scroll left as much as possible to show the formatted paragraph */
|
|
edit_scroll_left(edit, - edit->start_col);
|
|
}
|