Change tokenzing to concatenate all adjacent character tokens into one

HTMLKit/HTMLCharacterToken.h

@@ -15,4 +15,6 @@
 
 - (instancetype)initWithString:(NSString *)string;
 
+- (void)appendString:(NSString *)string;
+
 @end

HTMLKit/HTMLCharacterToken.m

@@ -10,8 +10,7 @@
 
 @interface HTMLCharacterToken ()
 {
-#warning Find a better solution. Single characters vs String of multiple characters
-	NSString *_characters;
+	NSMutableString *_characters;
 }
 @end
 
@@ -21,11 +20,16 @@
 {
 	self = [super init];
 	if (self) {
-		_characters = [string copy];
+		_characters = [[NSMutableString alloc] initWithString:string];
 	}
 	return self;
 }
 
+- (void)appendString:(NSString *)string
+{
+	[_characters appendString:string];
+}
+
 #pragma mark - NSObject
 
 - (BOOL)isEqual:(id)other

HTMLKit/HTMLTokenizer.m

@@ -167,8 +167,12 @@
 
 - (void)emitCharacterTokenWithString:(NSString *)string
 {
-	HTMLToken *token = [[HTMLCharacterToken alloc] initWithString:string];
-	[self emitToken:token];
+	HTMLToken *previousToken = [_tokens lastObject];
+	if ([previousToken isCharacterToken]) {
+		[(HTMLCharacterToken *)previousToken appendString:string];
+	} else {
+		[self emitToken:[[HTMLCharacterToken alloc] initWithString:string]];
+	}
 }
 
 - (void)emitParseError:(NSString *)format, ... NS_FORMAT_FUNCTION(1, 2)