LibTest/core/RegExp/Pattern_semantics/firstMatch_CharacterClassEscape_A05_t01.dart

// Copyright (c) 2011, 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.

/// @assertion 15.10.2.12: The production CharacterClassEscape :: w evaluates by
/// returning the set of characters containing the sixty-three characters: a b c
/// d e f g h i j k l m n o p q r s t u v w x y z A B C D E F G H I J K L M N O P
/// Q R S T U V W X Y Z 0 1 2 3 4 5 6 7 8 9 _
/// @description Checks that \w indeed matches only the specified characters
/// (tested vs all characters from the basic plane)
/// @3rdparty sputnik-v1:S15.10.2.12_A3_T1.js-S15.10.2.12_A3_T5.js
/// @author rodionov

import "../../../../Utils/expect.dart";
 

main() {
  RegExp re = new RegExp("\\w");
  for (int alpha = 0x0000; alpha <= 0xFFFF; alpha++) {
    // Skip the surrogates which are not valid char codes and will throw an
    // exception in String.fromCharCodes.
    if (alpha == 0xd800) alpha = 0xe000;
    
    String ch = new String.fromCharCodes([alpha]);
    if((alpha >= 0x0030 && alpha <= 0x0039) // the 10 digits
      || (alpha >= 0x0041 && alpha <= 0x005A) // the uppercase english letters
      || (alpha >= 0x0061 && alpha <= 0x007A) // the lowercase english letters
      || (alpha == 0x005F)) {// the underscore
        Expect.isNotNull(re.firstMatch(ch), "\\w !~ '$ch'");
    } else {
        Expect.isNull(re.firstMatch(ch), "\\w ~ '$ch'");
    }
  }
}