Refactor srcset parser to align it with spec changes

Source/core/html/parser/HTMLParserIdioms.h

 /*
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 18 matching lines @@
 #include "platform/Decimal.h"
 #include "wtf/Forward.h"
 #include "wtf/text/WTFString.h"
 
 namespace WTF {
 class TextEncoding;
 }
 
 namespace WebCore {
 
-// Space characters as defined by the HTML specification.
-bool isHTMLSpace(UChar);
-bool isHTMLLineBreak(UChar);
-bool isNotHTMLSpace(UChar);
-
 // Strip leading and trailing whitespace as defined by the HTML specification.
 String stripLeadingAndTrailingHTMLSpaces(const String&);
 template<size_t inlineCapacity>
 String stripLeadingAndTrailingHTMLSpaces(const Vector<UChar, inlineCapacity>& vector)
 {
     return stripLeadingAndTrailingHTMLSpaces(StringImpl::create8BitIfPossible(vector));
 }
 
 // An implementation of the HTML specification's algorithm to convert a number to a string for number and range types.
 String serializeForNumberType(const Decimal&);
 String serializeForNumberType(double);
 
 // Convert the specified string to a decimal/double. If the conversion fails, the return value is fallback value or NaN if not specified.
 // Leading or trailing illegal characters cause failure, as does passing an empty string.
 // The double* parameter may be 0 to check if the string can be parsed without getting the result.
 Decimal parseToDecimalForNumberType(const String&, const Decimal& fallbackValue = Decimal::nan());
 double parseToDoubleForNumberType(const String&, double fallbackValue = std::numeric_limits<double>::quiet_NaN());
 
 // http://www.whatwg.org/specs/web-apps/current-work/#rules-for-parsing-integers
 bool parseHTMLInteger(const String&, int&);
 
 // http://www.whatwg.org/specs/web-apps/current-work/#rules-for-parsing-non-negative-integers
 bool parseHTMLNonNegativeInteger(const String&, unsigned&);
 
 typedef Vector<pair<String, String> > HTMLAttributeList;
 // The returned encoding might not be valid.
 WTF::TextEncoding encodingFromMetaAttributes(const HTMLAttributeList&);
 
-// Inline implementations of some of the functions declared above.
-
+// Space characters as defined by the HTML specification.
 template<typename CharType>
 inline bool isHTMLSpace(CharType character)
 {
     // Histogram from Apple's page load test combined with some ad hoc browsing some other test suites.
     //
     //     82%: 216330 non-space characters, all > U+0020
     //     11%:  30017 plain space characters, U+0020
     //      5%:  12099 newline characters, U+000A
     //      2%:   5346 tab characters, U+0009
     //
     // No other characters seen. No U+000C or U+000D, and no other control characters.
     // Accordingly, we check for non-spaces first, then space, then newline, then tab, then the other characters.
 
     return character <= ' ' && (character == ' ' || character == '\n' || character == '\t' || character == '\r' || character == '\f');
 }
 
 template<typename CharType>
+inline bool isComma(CharType character)
+{
+    return character == ',';
+}
+
+template<typename CharType>
 inline bool isHTMLSpaceOrComma(CharType character)
 {
-    return isHTMLSpace<CharType>(character) || character == ',';
+    return isComma(character) || isHTMLSpace(character);
 }
 
 inline bool isHTMLLineBreak(UChar character)
 {
     return character <= '\r' && (character == '\n' || character == '\r');
 }
 
 template<typename CharType>
 inline bool isNotHTMLSpace(CharType character)
 {
@@ skipping 22 matching lines @@
 inline static String attemptStaticStringCreation(const String str)
 {
     if (!str.is8Bit())
         return attemptStaticStringCreation(str.characters16(), str.length(), Force16Bit);
     return attemptStaticStringCreation(str.characters8(), str.length());
 }
 
 
 }
 #endif