Fix handling for property values containing = or ,

Equals and comma are special values that need to be quoted with curly
braces.  This both parses and generates such quoted strings, although
they are only generated when necessary.

1 files changed, 9 insertions, 1 deletions

diff --git a/tikzit/src/common/GraphElementProperty.m b/tikzit/src/common/GraphElementProperty.m
index 9751230..4b47ca6 100644
--- a/tikzit/src/common/GraphElementProperty.m
+++ b/tikzit/src/common/GraphElementProperty.m
@@ -118,7 +118,15 @@
 	} else if ([self isKeyMatch]) {
 		return [NSString stringWithFormat:@"%@=*", [self key]];
 	} else {
-		return [NSString stringWithFormat:@"%@=%@", [self key], [self value]];
+		static NSCharacterSet *avoid = nil;
+		if (avoid == nil)
+			avoid = [[NSCharacterSet characterSetWithCharactersInString:@",="] retain];
+
+		if ([[self value] rangeOfCharacterFromSet:avoid].length > 0) {
+			return [NSString stringWithFormat:@"%@={%@}", [self key], [self value]];
+		} else {
+			return [NSString stringWithFormat:@"%@=%@", [self key], [self value]];
+		}
 	}
 }