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/*
* Copyright 2013 Alex Merry <alex.merry@kdemail.net>
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#import "NSString+Tikz.h"
#import "TikzGraphAssembler.h"
@implementation NSString (Tikz)
- (NSString*) tikzEscapedString {
static NSCharacterSet *avoid = nil;
if (avoid == nil)
#if __has_feature(objc_arc)
avoid = [[NSCharacterSet characterSetWithCharactersInString:@"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ<>-'0123456789. "] invertedSet];
#else
avoid = [[[NSCharacterSet characterSetWithCharactersInString:@"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ<>-'0123456789. "] invertedSet] retain];
#endif
if ([self rangeOfCharacterFromSet:avoid].length > 0) {
return [NSString stringWithFormat:@"{%@}", self];
} else {
#if __has_feature(objc_arc)
return self;
#else
return [[self retain] autorelease];
#endif
}
}
- (BOOL) isValidTikzPropertyNameOrValue {
NSUInteger length = [self length];
unsigned int brace_depth = 0;
unsigned int escape = 0;
for (NSUInteger i = 0; i < length; ++i) {
unichar c = [self characterAtIndex:i];
if (escape) {
escape = 0;
} else if (c == '\\') {
escape = 1;
} else if (c == '{') {
brace_depth++;
} else if (c == '}') {
if (brace_depth == 0)
return NO;
brace_depth--;
}
}
return !escape && brace_depth == 0;
}
- (BOOL) isValidAnchor {
return [TikzGraphAssembler validateTikzEdgeAnchor:self];
}
@end
// vi:ft=objc:noet:ts=4:sts=4:sw=4
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