| // Copyright (c) 2016, 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("AE", "AAEKFCD", 1, false, true, [1, 3, "AE"]); |
| check("(a|cd)+|ef", "BBAEKFCD", 2, false, true, [2, 3, "A"]); |
| check(".+: gr(a|e)y", "ccccolor: grey", 3, false, false, [3, 14, |
| "color: grey"]); |
| check("((a)|(ab))((c)|(bc))", "ccabc", 2, false, false, [2, 5, "abc"]); |
| check("(z)((a+)?(b+)?(c))*", "zzaacbbbcac", 1, false, false, |
| [1, 11, "zaacbbbcac"]); |
| } |
| |
| void check(String pattern, String str, int start, bool multiLine, |
| bool ignoreCase, List groupData) { |
| RegExp re = new RegExp( |
| pattern, multiLine: multiLine, caseSensitive: !ignoreCase); |
| Expect.isNotNull(re.matchAsPrefix(str, start), "\"$pattern\" !~ \"$str\""); |
| Match fm = re.matchAsPrefix(str, start) as Match; |
| Expect.equals(str, fm.input); |
| Expect.equals(pattern, (fm.pattern as RegExp).pattern); |
| if(groupData != null) { |
| Expect.equals(groupData.length, 3); |
| Expect.equals(groupData[0], fm.start); |
| Expect.equals(groupData[1], fm.end); |
| Expect.equals(groupData[2], fm.group(0)); |
| } |
| } |