| // 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 15.10.2.8: The form (?! Disjunction ) specifies a zero-width |
| /// negative lookahead. In order for it to succeed, the pattern inside |
| /// Disjunction must fail to match at the current position. The current position |
| /// is not advanced before matching the sequel. Disjunction can contain capturing |
| /// parentheses, but backreferences to them only make sense from within |
| /// Disjunction itself. Backreferences to these capturing parentheses from |
| /// elsewhere in the pattern always return undefined because the negative |
| /// lookahead must fail for the pattern to succeed. |
| /// @description Checks that this syntax works as specified. |
| /// @3rdparty sputnik-v1:S15.10.2.8_A2_T1.js-S15.10.2.8_A2_T11.js |
| /// @author rodionov |
| |
| import "../../../../Utils/expect.dart"; |
| |
| main() { |
| check(r"Java(?!Script)([A-Z]\w*)", "using of JavaBeans technology", 9, |
| ["JavaBeans", "Beans"]); |
| checkNeg(r"Java(?!Script)([A-Z]\w*)", "using of Java language"); |
| checkNeg(r"Java(?!Script)([A-Z]\w*)", "I\"m a JavaScripter"); |
| check(r"Java(?!Script)([A-Z]\w*)", "JavaScr oops ipt ", 0, ["JavaScr", "Scr"]); |
| check(r"(\.(?!com|org)|/)", "ah.info", 2, [".", "."]); |
| check(r"(\.(?!com|org)|/)", "ah/info", 2, ["/", "/"]); |
| checkNeg(r"(\.(?!com|org)|/)", "ah.com"); |
| check(r"(?!a|b)|c", "", 0, [""]); |
| check(r"(?!a|b)|c", "bc", 1, [""]); |
| check(r"(?!a|b)|c", "d", 0, [""]); |
| |
| check(r"(.*?)a(?!(a+)b\2c)\2(.*)", "baaabaac", 0, ["baaabaac", "ba", null, |
| "abaac"]); |
| } |
| |
| void check(String pattern, String str, int matchPos, |
| List<String?> expectedGroups) { |
| 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 != 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\""); |
| } |