Add convenience methods to cast HTML token to the appropriate type

HTMLKit/HTMLToken.h

@@ -8,6 +8,13 @@
 
 #import <Foundation/Foundation.h>
 
+@class HTMLDOCTYPEToken;
+@class HTMLStartTagToken;
+@class HTMLEndTagToken;
+@class HTMLCommentToken;
+@class HTMLCharacterToken;
+@class HTMLParseErrorToken;
+
 NS_INLINE BOOL nilOrEqual(id first, id second) {
 	return (first == nil && second == nil) || ([first isEqual:second]);
 }
@@ -35,4 +42,11 @@ typedef NS_ENUM(NSUInteger, HTMLTokenType)
 - (BOOL)isEOFToken;
 - (BOOL)isParseError;
 
+- (HTMLDOCTYPEToken *)asDoctypeToken;
+- (HTMLStartTagToken *)asStartTagToken;
+- (HTMLEndTagToken *)asEndTagToken;
+- (HTMLCommentToken *)asCommentToken;
+- (HTMLCharacterToken *)asCharacterToken;
+- (HTMLParseErrorToken *)asParseError;
+
 @end

HTMLKit/HTMLToken.m

@@ -53,4 +53,34 @@
 	return _type == HTMLTokenTypeParseError;
 }
 
+- (HTMLDOCTYPEToken *)asDoctypeToken
+{
+	return (HTMLDOCTYPEToken *)self;
+}
+
+- (HTMLStartTagToken *)asStartTagToken
+{
+	return (HTMLStartTagToken *)self;
+}
+
+- (HTMLEndTagToken *)asEndTagToken
+{
+	return (HTMLEndTagToken *)self;
+}
+
+- (HTMLCommentToken *)asCommentToken
+{
+	return (HTMLCommentToken *)self;
+}
+
+- (HTMLCharacterToken *)asCharacterToken
+{
+	return (HTMLCharacterToken *)self;
+}
+
+- (HTMLParseErrorToken *)asParseError
+{
+	return (HTMLParseErrorToken *)self;
+}
+
 @end