Make custom element name checks faster and fewer

third_party/WebKit/Source/platform/text/Character.h

 /*
  * Copyright (C) 2014 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 18 matching lines @@
  */
 
 #ifndef Character_h
 #define Character_h
 
 #include "platform/PlatformExport.h"
 #include "platform/text/CharacterProperty.h"
 #include "platform/text/TextDirection.h"
 #include "platform/text/TextPath.h"
 #include "platform/text/TextRun.h"
+#include "wtf/ASCIICType.h"
 #include "wtf/Allocator.h"
 #include "wtf/HashSet.h"
 #include "wtf/text/CharacterNames.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class PLATFORM_EXPORT Character {
     STATIC_ONLY(Character);
 public:
@@ skipping 25 matching lines @@
     static unsigned expansionOpportunityCount(const TextRun& run, bool& isAfterExpansion)
     {
         if (run.is8Bit())
             return expansionOpportunityCount(run.characters8(), run.length(), run.direction(), isAfterExpansion, run.getTextJustify());
         return expansionOpportunityCount(run.characters16(), run.length(), run.direction(), isAfterExpansion, run.getTextJustify());
     }
 
     static bool isUprightInMixedVertical(UChar32 character);
 
     // https://html.spec.whatwg.org/multipage/scripting.html#prod-potentialcustomelementname
+    static bool isPotentialCustomElementName8BitChar(LChar ch)
+    {
+        return isASCIILower(ch)
+            || isASCIIDigit(ch)
+            || ch == '-' || ch == '.' || ch == '_' || ch == 0xb7

[esprehn, 2016/09/07 03:54:05]

what char is 0xb7?

+            || (0xc0 <= ch && ch != 0xd7 && ch != 0xf7);

[esprehn, 2016/09/07 03:54:05]

What latin1 chars are these?

+    }
     static bool isPotentialCustomElementNameChar(UChar32 character);
 
     static bool treatAsSpace(UChar32 c)
     {
         return c == spaceCharacter
             || c == tabulationCharacter
             || c == newlineCharacter
             || c == noBreakSpaceCharacter;
     }
     static bool treatAsZeroWidthSpace(UChar32 c)
@@ skipping 67 matching lines @@
 
     static String normalizeSpaces(const LChar*, unsigned length);
     static String normalizeSpaces(const UChar*, unsigned length);
 
     static bool isCommonOrInheritedScript(UChar32);
 };
 
 } // namespace blink
 
 #endif