// 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 strings matched by [groups]. The order in the returned
/// string follows the order in [groups].
/// @description Checks that the correct groups are returned and their order is
/// correct (including the cases of both repeating and missing indices as well as
/// matches other than the first one).
/// @author rodionov

import "../../../Utils/expect.dart";
 
main() {
  check(".+: gr(a|e)y", "color: grey", 0, [0, 1], ["color: grey", "e"]);
  check(".+: gr(a|e)y", "color: grey", 0, [1, 0], ["e", "color: grey"]);
  check(".+: gr(a|e)y", "color: grey", 0, [0, 0, 0],
      ["color: grey", "color: grey", "color: grey"]);
  check(".+: gr(a|e)y", "color: grey", 0, [1, 1], ["e", "e"]);
  
  check("((a)|(ab))((c)|(bc))", "abc", 0, [0, 1, 2, 3, 4, 5, 6],
      ["abc", "a", "a", null, "bc", null, "bc"]);
  check("((a)|(ab))((c)|(bc))", "abc", 0, [0], ["abc"]);
  check("((a)|(ab))((c)|(bc))", "abc", 0, [1, 1], ["a", "a"]);
  check("((a)|(ab))((c)|(bc))", "abc", 0, [3, 3, 3, 0, 4, 4, 4],
      [null, null, null, "abc", "bc", "bc", "bc"]);
  check("((a)|(ab))((c)|(bc))", "abc", 0, [6, 4, 2, 1, 3, 5, 0],
      ["bc", "bc", "a", "a", null, null, "abc"]);
  check("((a)|(ab))((c)|(bc))", "abc", 0, [6, 6, 6, 6, 6, 6, 6, 6],
      ["bc", "bc", "bc", "bc", "bc", "bc", "bc", "bc"]);
  check("((a)|(ab))((c)|(bc))", "abc", 0,
      [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6], 
      ["bc", "bc", "bc", "bc", "bc", "bc", "bc", "bc", "bc", "bc", "bc", "bc",
      "bc", "bc", "bc"]);

  check(r"^(a+)\1*,(\1+)$", "aaaaaaaaa,aaaaaa\naa,aaaa\naaaaa,a", 1, [0, 1, 2],
      ["aa,aaaa", "aa", "aaaa"], multiLine: true);
  check(r"^(a+)\1*,(\1+)$", "aaaaaaaaa,aaaaaa\naa,aaaa\naaaaa,a", 1, [1], ["aa"],
      multiLine: true);
  check(r"^(a+)\1*,(\1+)$", "aaaaaaaaa,aaaaaa\naa,aaaa\naaaaa,a", 1,
      [2, 1, 2, 0, 2, 2], ["aaaa", "aa", "aaaa", "aa,aaaa", "aaaa", "aaaa"],
      multiLine: true);
}

void check(String pattern, String str, int matchNum, List<int> groupIndices,
    List<String?> expGroups, {bool multiLine: false, bool caseSensitive: true}) {
  RegExp re = new RegExp(pattern, multiLine: multiLine,
      caseSensitive: caseSensitive);
  Match? match = new List.from(re.allMatches(str))[matchNum];
  if(null == match) {
    Expect.fail("No match #$matchNum in '$pattern'/ ~ '$str'!");
  }
  // make sure the test parameters are correct
  Expect.equals(expGroups.length, groupIndices.length);

  List<String?> groups = match?.groups(groupIndices) as List<String?>;
  Expect.equals(groupIndices.length, groups.length);
  
  for(int i = 0; i < expGroups.length; i++) {
    if(expGroups[i] != groups[i]) {
      Expect.fail("Result of Match.groups() incorrect: $expGroups != $groups");
    }
  }
}