Use ASCII case-insensitive matching for attribute selectors

third_party/WebKit/Source/wtf/text/WTFString.h

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 69 matching lines @@
 };
 
 enum UTF8ConversionMode {
     LenientUTF8Conversion,
     StrictUTF8Conversion,
     StrictUTF8ConversionReplacingUnpairedSurrogatesWithFFFD
 };
 
 #define DISPATCH_CASE_OP(caseSensitivity, op, args)                     \
     ((caseSensitivity == TextCaseSensitive) ? op args :                 \
+     (caseSensitivity == TextCaseASCIIInsensitive) ? op##IgnoringASCIICase args : \

[tkent, 2015/12/11 00:02:45]

I was afraid the code size bloat by this.  However, |caseSensitivity| flag is
usually a constant value, and we can expect compilers eliminate unnecessary
code.  So, this is ok.

[fs, 2015/12/11 11:43:16]

Yes, this was how I reasoned about it as well.

      op##IgnoringCase args)
 
 template<bool isSpecialCharacter(UChar), typename CharacterType>
 bool isAllSpecialCharacters(const CharacterType*, size_t);
 
 // You can find documentation about this class in this doc:
 // https://docs.google.com/document/d/1kOCUlJdh2WJMJGDf-WoEQhmnjKLaOYRbiHz5TiGJl14/edit?usp=sharing
 class WTF_EXPORT String {
 public:
     // Construct a null string, distinguishable from an empty string.
@@ skipping 129 matching lines @@
         { return m_impl ? m_impl->reverseFind(c, start) : kNotFound; }
     size_t reverseFind(const String& str, unsigned start = UINT_MAX) const
         { return m_impl ? m_impl->reverseFind(str.impl(), start) : kNotFound; }
 
     // Case insensitive string matching.
     size_t findIgnoringCase(const LChar* str, unsigned start = 0) const
         { return m_impl ? m_impl->findIgnoringCase(str, start) : kNotFound; }
     size_t findIgnoringCase(const String& str, unsigned start = 0) const
         { return m_impl ? m_impl->findIgnoringCase(str.impl(), start) : kNotFound; }
 
+    // ASCII case insensitive string matching.
+    size_t findIgnoringASCIICase(const String& str, unsigned start = 0) const
+        { return m_impl ? m_impl->findIgnoringASCIICase(str.impl(), start) : kNotFound; }
+
     // Wrappers for find adding dynamic sensitivity check.
     size_t find(const LChar* str, unsigned start, TextCaseSensitivity caseSensitivity) const
         { return DISPATCH_CASE_OP(caseSensitivity, find, (str, start)); }
     size_t find(const String& str, unsigned start, TextCaseSensitivity caseSensitivity) const
         { return DISPATCH_CASE_OP(caseSensitivity, find, (str, start)); }
 
     Vector<UChar> charactersWithNullTermination() const;
     unsigned copyTo(UChar* buffer, unsigned pos, unsigned maxLength) const;
 
     template<size_t inlineCapacity>
@@ skipping 446 matching lines @@
 using WTF::charactersToFloat;
 using WTF::equal;
 using WTF::equalIgnoringCase;
 using WTF::find;
 using WTF::isAllSpecialCharacters;
 using WTF::isSpaceOrNewline;
 using WTF::reverseFind;
 
 #include "wtf/text/AtomicString.h"
 #endif // WTFString_h