LibTest/core/RegExp/Pattern_semantics/firstMatch_Term_A03_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 15.10.2.5: Atom's captures are cleared each time Atom is repeated.
 * @description Checks that the assertion is true.
 * @3rdparty sputnik-v1:S15.10.2.5_A1_T4.js
 * @author rodionov
 * @reviewer msyabro
 * @note issue 1290
 */
import "../../../../Utils/expect.dart";
 

main() {
  check("(z)((a+)?(b+)?(c))*", "zaacbbbcac", ["zaacbbbcac", "z", "ac", "a",
    null, "c"]);
  check("(z)((a+)?(b+)?(c))*", "zaacbbbc", ["zaacbbbc", "z", "bbbc", null,
    "bbb", "c"]);
}

void check(String pattern, String str,  List<String?> expectedGroups) {
  RegExp re = new RegExp(pattern);
  Expect.isNotNull(re.firstMatch(str), "\"$pattern\" !~ \"$str\"");
  Match fm = re.firstMatch(str) as Match;
  if(null != expectedGroups) {
    Expect.equals(expectedGroups.length, fm.groupCount + 1);
    
    for(int i = 0; i <= fm.groupCount; i++) {
      String? expGr = expectedGroups[i];
      String? actGr = fm.group(i);
      Expect.equals(expGr, actGr,
          "Mismatch at group $i: \"$expGr\" expected instead of \"$actGr\"");
    }
  }
}