| // Copyright (c) 2017, 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 Match matchAsPrefix(String string, [int start = 0]) |
| /// Match this pattern against the start of string. |
| /// |
| /// If start is provided, it must be an integer in the range 0 .. string.length. |
| /// In that case, this patten is tested against the string at the start position. |
| /// That is, a Match is returned if the pattern can match a part of the string |
| /// starting from position start. Returns null if the pattern doesn't match. |
| /// @description Checks that the returned Match is correctly initialized. Test |
| /// not null start |
| /// @author sgrekhov@unipro.ru |
| |
| import "../../../Utils/expect.dart"; |
| |
| main() { |
| check("EK", "AEKFCD", 1, [1, 3, "EK"]); |
| check("acd", "AAacdKFCD", 2, [2, 5, "acd"]); |
| check("AB", "abcdefg", 1, null); |
| check("AB", "11ABcdefg", 2, [2, 4, "AB"]); |
| check("\s", " ABcd efg", 2, null); |
| check(":alpha:", "1ABcdefg", 1, null); |
| check(":alpha:", "1:alphaABcdefg", 1, null); |
| check(":alpha:", "1:alpha:ABcdefg", 1, [1, 8, ":alpha:"]); |
| } |
| |
| void check(String pattern, String str, int start, List? groupData) { |
| Match? fm = pattern.matchAsPrefix(str, start); |
| if(fm == null && groupData != null) { |
| Expect.fail("Nothing found for pattern <$pattern> in string <$str>"); |
| } |
| if (groupData == null) { |
| Expect.isNull(fm); |
| return; |
| } |
| if (fm != null) { |
| Expect.equals(str, fm.input); |
| Expect.equals(pattern, fm.pattern); |
| Expect.equals(groupData.length, 3); |
| Expect.equals(groupData[0], fm.start); |
| Expect.equals(groupData[1], fm.end); |
| Expect.equals(groupData[2], fm.group(0)); |
| } else { |
| Expect.fail("Match is null"); |
| } |
| } |