LibTest/core/RegExp/Pattern_semantics/firstMatch_Quantifier_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 15.10.2.7: The production QuantifierPrefix :: ? evaluates by
/// returning the two results 0 and 1.
/// @description Checks that this quantifier is applied correctly in various
/// scenarios.
/// @3rdparty sputnik-v1:S15.10.2.7_A5_T1.js-S15.10.2.7_A5_T12.js
/// @author rodionov

import "../../../../Utils/expect.dart";
 
main() {
  check("java(script)?", "state: javascript is an extension of ecma script", 7,
      ["javascript", "script"]);
  check("java(script)?", "state: java and javascript are vastly different", 7,
      ["java", null]);
  checkNeg("java(script)?",
      "state: both Java and JavaScript used in web development");
  check("cd?e", "abcdef", 2, ["cde"]);
  check("cdx?e", "abcdef", 2, ["cde"]);
  check("o?pqrst", "pqrstuvw", 0, ["pqrst"]);
  check("x?y?z?", "abcdef", 0, [""]);
  check("x?ay?bz?c", "abcdef", 0, ["abc"]);
  check("b?b?b?b", "abbbbc", 1, ["bbbb"]);
  check("(b?)(b?)(b?)b", "abbc", 1, ["bb", "b", "", ""]);
  check("ab?c?d?x?y?z", "123az789", 3, ["az"]);
  check(r"\??\??\??\??\??", "?????", 0, ["?????"]);
  check(".?.?.?.?.?.?.?", "test", 0, ["test"]);
}

void check(String pattern, String str, [int matchPos = -1,
List<String?>? expectedGroups = null]) {
  RegExp re = new RegExp(pattern);
  Expect.isNotNull(re.firstMatch(str));
  Match fm = re.firstMatch(str) as Match;
  if(matchPos >= 0) {
    Expect.equals(matchPos, fm.start);
  }
  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\"");
    }
  }
}

void checkNeg(String pattern, String str) {
  RegExp re = new RegExp(pattern);
  Expect.isNull(re.firstMatch(str), "\"$pattern\" ~ \"$str\"");
}