1 files changed, 127 insertions, 0 deletions
diff --git a/tikzit/src/common/GraphElementProperty.m b/tikzit/src/common/GraphElementProperty.m
new file mode 100644
index 0000000..79abe79
--- /dev/null
+++ b/tikzit/src/common/GraphElementProperty.m
@@ -0,0 +1,127 @@
+//
+//
+//  GraphElementProperty.m
+//  TikZiT
+//  
+//  Copyright 2010 Aleks Kissinger. All rights reserved.
+//  
+//  
+//  This file is part of TikZiT.
+//  
+//  TikZiT 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 3 of the License, or
+//  (at your option) any later version.
+//  
+//  TikZiT 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 TikZiT.  If not, see <http://www.gnu.org/licenses/>.
+//  
+
+#import "GraphElementProperty.h"
+
+
+@implementation GraphElementProperty
+
+- (id)initWithAtomName:(NSString*)n {
+	[super init];
+	[self setKey:n];
+	[self setValue:nil];
+	isAtom = YES;
+	isKeyMatch = NO;
+	return self;
+}
+
+- (id)initWithPropertyValue:(NSString*)v forKey:(NSString*)k {
+	[super init];
+	[self setKey:k];
+	[self setValue:v];
+	isAtom = NO;
+	isKeyMatch = NO;
+	return self;
+}
+
+- (id)initWithKeyMatching:(NSString*)k {
+	[super init];
+	[self setKey:k];
+	[self setValue:nil];
+	isAtom = NO;
+	isKeyMatch = YES;
+	return self;
+}
+
+- (void)setValue:(NSString *)v {
+	if (value != v) {
+		[value release];
+		value = [v copy];
+	}
+}
+
+- (NSString*)value {
+	if (isAtom) {
+		return @"(atom)";
+	} else {
+		return value;
+	}
+}
+
+
+- (void)setKey:(NSString *)k {
+    if (k == nil) k = @""; // don't allow nil keys
+	if (key != k) {
+		[key release];
+		key = [k retain];
+	}
+}
+
+- (NSString*)key {
+    return key;
+}
+
+- (BOOL)isAtom { return isAtom; }
+- (BOOL)isKeyMatch { return isKeyMatch; }
+
+- (BOOL)matches:(GraphElementProperty*)object {
+	// properties and atoms are taken to be incomparable
+	if ([self isAtom] != [object isAtom]) return NO;
+	
+	// only compare keys if (a) we are both atoms, (b) i am a key match, or (c) object is a key match
+	if (([self isAtom] && [object isAtom]) || [self isKeyMatch] || [object isKeyMatch]) {
+		return [[self key] isEqual:[object key]];
+	}
+	
+	// otherwise compare key and value
+	return [[self key] isEqual:[object key]] && [[self value] isEqual:[object value]];
+}
+
+- (BOOL)isEqual:(id)object {
+	return [self matches:object];
+}
+
+- (id)copy {
+	if (isAtom) {
+		return [[GraphElementProperty alloc] initWithAtomName:[self key]];
+	} else if (isKeyMatch) {
+		return [[GraphElementProperty alloc] initWithKeyMatching:[self key]];
+	} else {
+		return [[GraphElementProperty alloc] initWithPropertyValue:[self value] forKey:[self key]];
+	}
+}
+
+- (NSString*)description {
+	if ([self isAtom]) {
+		return [self key];
+	} else if ([self isKeyMatch]) {
+		return [NSString stringWithFormat:@"%@=*", [self key]];
+	} else {
+		return [NSString stringWithFormat:@"%@=%@", [self key], [self value]];
+	}
+}
+
+@end
+
+// vi:ft=objc:ts=4:noet:sts=4:sw=4