Add Comment less-than sign bang dash dash state errors.

Author: inikulin

lib/common/error_codes.js

@@ -14,5 +14,6 @@ module.exports = {
     eofBeforeEndTagName: 'eof-before-end-tag-name',
     cdataInHtmlContent: 'cdata-in-html-content',
     malformedComment: 'malformed-comment',
-    eofInScriptHtmlComment: 'eof-in-script-html-comment'
+    eofInScriptHtmlComment: 'eof-in-script-html-comment',
+    nestedComment: 'nested-comment'
 };

lib/tokenizer/index.js

@@ -71,6 +71,10 @@ var DATA_STATE = 'DATA_STATE',
     COMMENT_START_STATE = 'COMMENT_START_STATE',
     COMMENT_START_DASH_STATE = 'COMMENT_START_DASH_STATE',
     COMMENT_STATE = 'COMMENT_STATE',
+    COMMENT_LESS_THAN_SIGN_STATE = 'COMMENT_LESS_THAN_SIGN_STATE',
+    COMMENT_LESS_THAN_SIGN_BANG_STATE = 'COMMENT_LESS_THAN_SIGN_BANG_STATE',
+    COMMENT_LESS_THAN_SIGN_BANG_DASH_STATE = 'COMMENT_LESS_THAN_SIGN_BANG_DASH_STATE',
+    COMMENT_LESS_THAN_SIGN_BANG_DASH_DASH_STATE = 'COMMENT_LESS_THAN_SIGN_BANG_DASH_DASH_STATE',
     COMMENT_END_DASH_STATE = 'COMMENT_END_DASH_STATE',
     COMMENT_END_STATE = 'COMMENT_END_STATE',
     COMMENT_END_BANG_STATE = 'COMMENT_END_BANG_STATE',
@@ -1631,6 +1635,11 @@ _[COMMENT_STATE] = function commentState(cp) {
     if (cp === $.HYPHEN_MINUS)
         this.state = COMMENT_END_DASH_STATE;
 
+    else if (cp === $.LESS_THAN_SIGN) {
+        this.currentToken.data += '<';
+        this.state = COMMENT_LESS_THAN_SIGN_STATE;
+    }
+
     else if (cp === $.NULL)
         this.currentToken.data += UNICODE.REPLACEMENT_CHARACTER;
 
@@ -1644,6 +1653,54 @@ _[COMMENT_STATE] = function commentState(cp) {
 };
 
 
+// Comment less-than sign state
+//------------------------------------------------------------------
+_[COMMENT_LESS_THAN_SIGN_STATE] = function commentLessThanSignState(cp) {
+    if (cp === $.EXCLAMATION_MARK) {
+        this.currentToken.data += '!';
+        this.state = COMMENT_LESS_THAN_SIGN_BANG_STATE;
+    }
+
+    else if (cp === $.LESS_THAN_SIGN)
+        this.currentToken.data += '!';
+
+    else
+        this._reconsumeInState(COMMENT_STATE);
+};
+
+
+// Comment less-than sign bang state
+//------------------------------------------------------------------
+_[COMMENT_LESS_THAN_SIGN_BANG_STATE] = function commentLessThanSignBangState(cp) {
+    if (cp === $.HYPHEN_MINUS)
+        this.state = COMMENT_LESS_THAN_SIGN_BANG_DASH_STATE;
+
+    else
+        this._reconsumeInState(COMMENT_STATE);
+};
+
+
+// Comment less-than sign bang dash state
+//------------------------------------------------------------------
+_[COMMENT_LESS_THAN_SIGN_BANG_DASH_STATE] = function commentLessThanSignBangDashState(cp) {
+    if (cp === $.HYPHEN_MINUS)
+        this.state = COMMENT_LESS_THAN_SIGN_BANG_DASH_DASH_STATE;
+
+    else
+        this._reconsumeInState(COMMENT_END_DASH_STATE);
+};
+
+
+// Comment less-than sign bang dash dash state
+//------------------------------------------------------------------
+_[COMMENT_LESS_THAN_SIGN_BANG_DASH_DASH_STATE] = function commentLessThanSignBangDashDashState(cp) {
+    if (cp !== $.GREATER_THAN_SIGN && cp !== $.EOF)
+        this._err(ERR.nestedComment);
+
+    this._reconsumeInState(COMMENT_END_STATE);
+};
+
+
 // Comment end dash state
 //------------------------------------------------------------------
 _[COMMENT_END_DASH_STATE] = function commentEndDashState(cp) {