LibTest/core/RegExp/Pattern_semantics/firstMatch_Quantifier_A06_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,
 * DecimalDigits} evaluates by returning MVs of the first and second
 * DecimalDigits, respectively.
 * @description Checks that this quantifier is applied correctly in various
 * scenarios.
 * @3rdparty sputnik-v1:S15.10.2.7_A1_T1.js-S15.10.2.7_A1_T12.js
 * @author rodionov
 */
import "../../../../Utils/expect.dart";
 
main() {
  check(r"\d{2,4}", "the answer is 42",14, ["42"]);
  checkNeg(r"\d{2,4}", "the 7 movie");
  check(r"\d{2,4}", "the 20000 Leagues Under the Sea book", 4, ["2000"]);
  check(r"\d{2,4}", "the Fahrenheit 451 book", 15, ["451"]);
  check(r"\d{2,4}", "the 1984 novel", 4, ["1984"]);
  check(r"\d{2,4}", "0a0\u0031\u0031b", 2, ["011"]);
  check(r"\d{2,4}", "0a0\u0031\u003122b", 2, ["0112"]);
  check(r"b{2,3}c", "aaabbbbcccddeeeefffff", 4, ["bbbc"]);
  checkNeg(r"b{42,93}c", "aaabbbbcccddeeeefffff");
  check(r"b{0,93}c", "aaabbbbcccddeeeefffff", 3, ["bbbbc"]);
  check(r"bx{0,93}c", "aaabbbbcccddeeeefffff", 6, ["bc"]);
  check(r".{0,93}", "weirwerdf", 0, ["weirwerdf"]);
  check(r"((12){2,3}).?.?(\1{0,3})", "12121212121212", 0, ["12121212121212",
  "121212", "12", "121212"]);
}

void check(String pattern, String str, int matchPos, List<String> expGroups) {
  RegExp re = new RegExp(pattern);
  Expect.isNotNull(re.firstMatch(str), "\"$pattern\" !~ \"$str\"");
  Match fm = re.firstMatch(str) as Match;
  if(matchPos >= 0) {
    Expect.equals(matchPos, fm.start);
  }
  if(null != expGroups) {
    Expect.equals(expGroups.length, fm.groupCount + 1);
    
    for(int i = 0; i <= fm.groupCount; i++) {
      String? expGr = expGroups[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\"");
}