Move various top-level Unicode definitions into classes and methods.

runtime/vm/scanner.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/scanner.h"
 
 #include "platform/assert.h"
 #include "vm/flags.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
@@ skipping 503 matching lines @@
     ReadChar();  // Skip left curly bracket.
     is_valid = ScanHexDigits(1, 6, code_point);
     if (is_valid) {
       if (c0_ != '}') {
         ErrorMsg("expected '}' after character code");
         return;
       }
     }
   }
   if (is_valid &&
-      ((*code_point > 0x10FFFF) ||
-       ((*code_point & 0xFFFFF800) == 0xD800))) {
+      ((Utf::IsOutOfRange(*code_point) ||
+        (Utf16::IsSurrogate(*code_point))))) {
     ErrorMsg("invalid code point");
   }
 }
 
 
 void Scanner::ScanLiteralStringChars(bool is_raw) {
   GrowableArray<int32_t> string_chars(64);
 
   ASSERT(IsScanningString());
   // We are at the first character of a string literal piece. A string literal
@@ skipping 450 matching lines @@
               "%c%#"Px"", kPrivateKeySeparator, key_value);
   const String& result = String::Handle(String::New(private_key, Heap::kOld));
   return result.raw();
 }
 
 
 void Scanner::InitOnce() {
 }
 
 }  // namespace dart