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/*
* Copyright (C) 1998 David Stes.
*
* 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 <assert.h>
#include <Object.h>
#include <octext.h>
#include <curses.h>
#include "charscan.h"
#include "compscan.h"
#include "textline.h"
@implementation CompositionScanner
- newline
{
[line stop:lastindex];
spacex = destx;
[line paddingwidth:rightmargin - destx]; /* could be used for center */
stopscanning = YES;
return self;
}
- space
{
spacex = destx;
ascentatspace = ascent; /* to be able to restore them later */
descentatspace = descent;
spaceindex = lastindex;
spacecount++; /* record them for linebreaking/justif. purposes */
destx += spacewidth;
++lastindex;
stopscanning = NO;
if (destx > rightmargin) return [self crossedx];
return self;
}
- tab
{
int newx;
newx += MYTABWIDTH;
/* Squeak is doing a crossedx here, but I find newline more logical */
if (newx >= rightmargin) return [self newline];
destx= newx;
++lastindex;
stopscanning = NO;
return self;
}
- crossedx
{
int linebegin = [line first];
if (dowrap == NO) {
[line stop:lastindex-1];
stopscanning = YES;
return self;
}
if (spacecount) {
[line stop:spaceindex];
/* for purposes of justification, set spacecount and paddingwidth
* to first space at end (if there were multiple spaces at end of line)
*/
--spacecount;
--spaceindex;
while (spaceindex > linebegin && [text charAt:spaceindex] == ' ') {
--spacecount;
--spaceindex;
spacex -= spacewidth;
}
[line spacecount:spacecount];
[line paddingwidth:rightmargin - spacex];
ascent = ascentatspace;
descent = descentatspace;
spacecount = 0;
stopscanning = YES;
return self;
} else {
--lastindex;
spacex = destx;
[line spacecount:spacecount];
[line paddingwidth:rightmargin - destx];
[line stop:(lastindex>linebegin)?lastindex:linebegin];
stopscanning = YES;
return self;
}
}
- endOfRun /* one position after last run now */
{
if (lastindex == [text size]) {
[line stop:lastindex - 1];
spacex = destx;
[line paddingwidth:rightmargin - destx];
stopscanning = YES;
return self;
} else {
int length = [text runLengthFor:lastindex];
runstopindex = lastindex + length - 1;
[self setfont]; /* start of new run -- reset font for run */
stopscanning = NO;
return self;
}
}
- composeLine:(int)i from:(int)from in:paragraph
{
[self setparagraph:paragraph];
ascent = 0;
descent = 0;
spacecount = 0;
destx = leftmargin;
desty = 0;
spacex = leftmargin;
spacecount = 0;
if (leftmargin >= rightmargin) {
dbg("Leftmargin overflow. No room between margins\n");
while (leftmargin >= rightmargin) leftmargin -= rightmargin;
}
lastindex = from;
runstopindex = from + [text runLengthFor:from] - 1;
line = [TextLine new];
[line start:lastindex];
stopscanning = NO;
displaying = NO;
[self setfont]; /* also set by -endOfRun */
while (!stopscanning) {
id str = [text string];
[self scancharsfrom:lastindex to:runstopindex in:str rightx:rightmargin];
}
[line ascent:ascent descent:descent];
return line;
}
- (int)rightx
{
return spacex;
}
@end
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