Redo "Steps towards making dart2js JS AST templates an indepentent library."

pkg/compiler/lib/src/js/characters.dart

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2015, 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.
 
-library characters;
+library js_character_codes;
 
 const int $EOF = 0;
 const int $STX = 2;
 const int $BS  = 8;
 const int $TAB = 9;
 const int $LF = 10;
 const int $VTAB = 11;
 const int $FF = 12;
 const int $CR = 13;
 const int $SPACE = 32;
@@ skipping 92 matching lines @@
 const int $CLOSE_CURLY_BRACKET = 125;
 const int $TILDE = 126;
 const int $DEL = 127;
 const int $NBSP = 160;
 const int $LS = 0x2028;
 const int $PS = 0x2029;
 
 const int $FIRST_SURROGATE = 0xd800;
 const int $LAST_SURROGATE = 0xdfff;
 const int $LAST_CODE_POINT = 0x10ffff;
-
-bool isHexDigit(int characterCode) {
-  if (characterCode <= $9) return $0 <= characterCode;
-  characterCode |= $a ^ $A;
-  return ($a <= characterCode && characterCode <= $f);
-}
-
-int hexDigitValue(int hexDigit) {
-  assert(isHexDigit(hexDigit));
-  // hexDigit is one of '0'..'9', 'A'..'F' and 'a'..'f'.
-  if (hexDigit <= $9) return hexDigit - $0;
-  return (hexDigit | ($a ^ $A)) - ($a - 10);
-}
-
-bool isUnicodeScalarValue(int value) {
-  return value < $FIRST_SURROGATE ||
-      (value > $LAST_SURROGATE && value <= $LAST_CODE_POINT);
-}
-
-bool isUtf16LeadSurrogate(int value) {
-  return value >= 0xd800 && value <= 0xdbff;
-}
-
-bool isUtf16TrailSurrogate(int value) {
-  return value >= 0xdc00 && value <= 0xdfff;
-}