Made Date parser work on flat strings instead of arbitrary ones.

src/char-predicates-inl.h

 // Copyright 2006-2008 the V8 project authors. 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
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 25 matching lines @@
 inline bool IsCarriageReturn(uc32 c) {
   return c == 0x000D;
 }
 
 
 inline bool IsLineFeed(uc32 c) {
   return c == 0x000A;
 }
 
 
+static inline bool IsInRange(int value, int lower_limit, int higher_limit) {
+  ASSERT(lower_limit <= higher_limit);
+  return static_cast<unsigned int>(value - lower_limit) <=
+      static_cast<unsigned int>(higher_limit - lower_limit);
+}
+
+
 inline bool IsDecimalDigit(uc32 c) {
   // ECMA-262, 3rd, 7.8.3 (p 16)
-  return
-    '0' <= c && c <= '9';
+  return IsInRange(c, '0', '9');
 }
 
 
 inline bool IsHexDigit(uc32 c) {
   // ECMA-262, 3rd, 7.6 (p 15)
-  return
-    ('0' <= c && c <= '9') ||
-    ('A' <= c && c <= 'F') ||
-    ('a' <= c && c <= 'f');
+  return IsDecimalDigit(c) || IsInRange(c | 0x20, 'a', 'f');
 }
 
 
 inline bool IsRegExpWord(uc16 c) {
-  return ('a' <= c && c <= 'z')
-      || ('A' <= c && c <= 'Z')
-      || ('0' <= c && c <= '9')
+  return IsInRange(c | 0x20, 'a', 'z')
+      || IsDecimalDigit(c)
       || (c == '_');
 }
 
 
 inline bool IsRegExpNewline(uc16 c) {
   switch (c) {
     //   CR           LF           LS           PS
     case 0x000A: case 0x000D: case 0x2028: case 0x2029:
       return false;
     default:
       return true;
   }
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_CHAR_PREDICATES_INL_H_