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/* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <config.h>
#include "edit.h"
#ifdef MIDNIGHT
#define tab_width option_tab_spacing
#endif
int line_is_blank (WEdit * edit, long line);
#define NO_FORMAT_CHARS_START "-+*\\,.;:&>"
static long line_start (WEdit * edit, long line)
{
static long p = -1, l = 0;
int c;
if (p == -1 || abs (l - line) > abs (edit->curs_line - line)) {
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);
l = line;
p = edit_bol (edit, p);
while (strchr ("\t ", c = 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;
}
static long begin_paragraph (WEdit * edit, long p, 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);
}
static long end_paragraph (WEdit * edit, long p, 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 char *get_paragraph (WEdit * edit, long p, long q, int indent, int *size)
{
char *s, *t;
t = malloc ((q - p) + 2 * (q - p) / option_word_wrap_line_length + 10);
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 (char *t, int size)
{
char *p = t;
while (size--) {
*p = *p == '\n' ? ' ' : *p;
p++;
}
}
#ifndef MIDNIGHT
int edit_width_of_long_printable (int c);
#endif
/*
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
*/
extern int tab_width;
static inline int next_tab_pos (int x)
{
return x += tab_width - x % tab_width;
}
static int line_pixel_length (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:
#ifdef MIDNIGHT
xn = x + 1;
#else
xn = x + edit_width_of_long_printable (c);
#endif
break;
}
if (xn > l)
break;
x = xn;
b++;
}
return b;
}
/* find the start of a word */
static int next_word_start (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 (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 (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);
}
void edit_insert_indent (WEdit * edit, int indent);
/* replaces a block of text */
static void put_paragraph (WEdit * edit, 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 */
}
int edit_indent_width (WEdit * edit, long p);
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;
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, edit->curs1, force);
q = end_paragraph (edit, edit->curs1, 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);
}
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