Improved parse error handling for CSSMQ.

Source/core/css/CSSParser.cpp

 /*
  * Copyright (C) 2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
  * Copyright (C) 2012 Intel Corporation. All rights reserved.
  *
@@ skipping 1404 matching lines @@
 }
 
 PassOwnPtr<MediaQuery> CSSParser::parseMediaQuery(const String& string)
 {
     if (string.isEmpty())
         return nullptr;
 
     ASSERT(!m_mediaQuery);
 
     // can't use { because tokenizer state switches from mediaquery to initial state when it sees { token.
-    // instead insert one " " (which is WHITESPACE in CSSGrammar.y)
-    setupParser("@-webkit-mediaquery ", string, "} ");
+    // instead insert one " " (which is caught by maybe_space in CSSGrammar.y)
+    setupParser("@-webkit-mediaquery ", string, "");
     cssyyparse(this);
 
     return m_mediaQuery.release();
 }
 
 static inline void filterProperties(bool important, const CSSParser::ParsedPropertyVector& input, Vector<CSSProperty, 256>& output, size_t& unusedEntries, BitArray<numCSSProperties>& seenProperties, HashSet<AtomicString>& seenVariables)
 {
     // Add properties in reverse order so that highest priority definitions are reached first. Duplicate definitions can then be ignored when found.
     for (int i = input.size() - 1; i >= 0; --i) {
         const CSSProperty& property = input[i];
@@ skipping 8901 matching lines @@
         m_token = IDENT;
 
         if (UNLIKELY(*currentCharacter<SrcCharacterType>() == '(')) {
             if (m_parsingMode == SupportsMode && !hasEscape) {
                 detectSupportsToken<SrcCharacterType>(result - tokenStart<SrcCharacterType>());
                 if (m_token != IDENT)
                     break;
             }
 
             m_token = FUNCTION;
-            bool shouldSkipParenthesis = true;
-            if (!hasEscape) {
-                bool detected = detectFunctionTypeToken<SrcCharacterType>(result - tokenStart<SrcCharacterType>());
-                if (!detected && m_parsingMode == MediaQueryMode) {
-                    // ... and(max-width: 480px) ... looks like a function, but in fact it is not,
-                    // so run more detection code in the MediaQueryMode.
-                    detectMediaQueryToken<SrcCharacterType>(result - tokenStart<SrcCharacterType>());
-                    shouldSkipParenthesis = false;
-                }
-            }
-
-            if (LIKELY(shouldSkipParenthesis)) {
-                ++currentCharacter<SrcCharacterType>();
-                ++result;
-                ++yylval->string.m_length;
-            }
+            if (!hasEscape)
+                detectFunctionTypeToken<SrcCharacterType>(result - tokenStart<SrcCharacterType>());
+            ++currentCharacter<SrcCharacterType>();
+            ++result;
+            ++yylval->string.m_length;
 
             if (token() == URI) {
                 m_token = FUNCTION;
                 // Check whether it is really an URI.
                 if (yylval->string.is8Bit())
                     parseURI<LChar>(yylval->string);
                 else
                     parseURI<UChar>(yylval->string);
             }
         } else if (UNLIKELY(m_parsingMode != NormalMode) && !hasEscape) {
@@ skipping 1324 matching lines @@
 {
     // The tokenizer checks for the construct of an+b.
     // However, since the {ident} rule precedes the {nth} rule, some of those
     // tokens are identified as string literal. Furthermore we need to accept
     // "odd" and "even" which does not match to an+b.
     return equalIgnoringCase(token, "odd") || equalIgnoringCase(token, "even")
         || equalIgnoringCase(token, "n") || equalIgnoringCase(token, "-n");
 }
 
 }