LibTest/core/RegExp/Pattern_semantics/firstMatch_Quantifier_A04_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 :: {DecimalDigits}
 *            evaluates by returning the MV of DecimalDigits.
 * @description Checks that this quantifier is applied correctly in various
 *              scenarios.
 * @3rdparty sputnik-v1:S15.10.2.7_A2_T1.js-S15.10.2.7_A2_T4.js
 * @author rodionov
 * @reviewer msyabro
 */
import "../../../../Utils/expect.dart";
 

main() {
  check(r"[a-zA-Z]{3}\d{2}", "xa124dfdg08", 6, ["fdg08"]);
  check(r"b{2}c", "aaabbbbcccddeeeefffff", 5, ["bbc"]);
  checkNeg(r"b{8}", "aaabbbbcccddeeeefffff");
}

void check(String pattern, String str, int matchPos, List<String> expectedGroups) {
  RegExp re = new RegExp(pattern);
  Match fm = re.firstMatch(str);
  if(null == fm) {
    Expect.fail("\"$pattern\" !~ \"$str\"");
  }
  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);
      if(expGr != actGr) {
        Expect.fail("Mismatch at group $i: \"$expGr\" expected instead of \"$actGr\"");
      }
    }
  }
}

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