Add stream location to Parse Error tokens for more comprehensive reporting

HTMLKit/HTMLParseErrorToken.h

@@ -12,7 +12,8 @@
 @interface HTMLParseErrorToken : HTMLToken
 
 @property (nonatomic, copy) NSString *reason;
+@property (nonatomic, assign) NSUInteger location;
 
-- (instancetype)initWithReasonMessage:(NSString *)reason;
+- (instancetype)initWithReasonMessage:(NSString *)reason andStreamLocation:(NSUInteger)location;
 
 @end

HTMLKit/HTMLParseErrorToken.m

@@ -11,20 +11,28 @@
 @interface HTMLParseErrorToken ()
 {
 	NSString *_reason;
+	NSUInteger _location;
 }
 @end
 
 @implementation HTMLParseErrorToken
 @synthesize reason = _reason;
+@synthesize location = _location;
 
-- (instancetype)initWithReasonMessage:(NSString *)reason
+- (instancetype)initWithReasonMessage:(NSString *)reason andStreamLocation:(NSUInteger)location
 {
 	self = [super init];
 	if (self) {
 		self.type = HTMLTokenTypeParseError;
 		_reason = [reason copy];
+		_location = location;
 	}
 	return self;
 }
 
+- (NSString *)description
+{
+	return [NSString stringWithFormat:@"<%@: %p Reason=%@ Location=%lu>", self.class, self, _reason, _location];
+}
+
 @end

HTMLKit/HTMLTokenizer.m

@@ -166,7 +166,8 @@
 	va_start(args, format);
 	NSString *message = [[NSString alloc] initWithFormat:format arguments:args];
 	va_end(args);
-	HTMLParseErrorToken *token = [[HTMLParseErrorToken alloc] initWithReasonMessage:message];
+	HTMLParseErrorToken *token = [[HTMLParseErrorToken alloc] initWithReasonMessage:message
+																  andStreamLocation:_inputStreamReader.currentLocation];
 	[self emitToken:token];
 }