// 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 Returns the string matched by the given [group]. If [group] is 0,
/// returns the match of the regular expression.
/// @description Checks that the correct group is returned when valid index is used.
/// @author rodionov
/// @issue 1290

import "../../../Utils/expect.dart";
 
main() {
  check("(ab|cd)+|ef", "AEKFCD", ["CD", "CD"], caseSensitive: false);
  check(".+: gr(a|e)y", "color: grey", ["color: grey", "e"]);
  check("((a)|(ab))((c)|(bc))", "abc",
      ["abc", "a", "a", null, "bc", null, "bc"]);
  check(r"^(a+)\1*,\1+$", "aaaaaaaaa,aaaaaa", ["aaaaaaaaa,aaaaaa", "aaa"]);
  check(r"^(a+?)\1*,\1+$", "aaaaaa,aaaaaaaaa", ["aaaaaa,aaaaaaaaa", "a"]);
  check("(z)((a+)?(b+)?(c))*", "zaacbbbcac",
      ["zaacbbbcac", "z", "ac", "a", null, "c"]); // issue 1290
  check(r"[^o]t\b", "pilOt\nsoviet robot\topenoffice", ["Ot"]);
  check(r"[^o]t\b", "pilOt\nsoviet robot\topenoffice", ["et"],
      caseSensitive: false);
  check(r"^^^^^^^\b\b\b\bro\B\B\B\Bbot\b\b\b\b\b$$$$", "robot", ["robot"]);
}

void check(String pattern, String str, List<String?> groupData,
    {bool multiLine = false, bool caseSensitive = true}) {
  RegExp re = new RegExp(pattern, multiLine: multiLine,
      caseSensitive: caseSensitive);
  Match fm = re.firstMatch(str) as Match;

  Expect.equals(groupData.length, fm.groupCount + 1);
  
  for(int i = 0; i <= fm.groupCount; i++) {
    String? actGr = fm[i];
    String? expGr = groupData[i];
    if(expGr != actGr) {
      Expect.fail("Mismatch at group $i: '$expGr' expected instead of '$actGr'");
    }
  }
}