Terry Lucas
7eb00ea45d
R=bkonyi@google.com Change-Id: If6c7c2ebd8a4e3a3b724ada3967fc5836123732d Reviewed-on: https://dart-review.googlesource.com/13621 Commit-Queue: Terry Lucas <terry@google.com> Reviewed-by: Bob Nystrom <rnystrom@google.com>
85 lines
2.9 KiB
Dart
85 lines
2.9 KiB
Dart
// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// Dart test for testing regular expressions in Dart.
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import "package:expect/expect.dart";
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void main() {
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RegExp exp = new RegExp(r"(\w+)");
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String str = "Parse my string";
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List<Match> matches = exp.allMatches(str).toList();
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Expect.equals(3, matches.length);
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Expect.equals("Parse", matches[0].group(0));
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Expect.equals("my", matches[1].group(0));
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Expect.equals("string", matches[2].group(0));
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// Check that allMatches progresses correctly for empty matches, and that
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// it includes the empty match at the end position.
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exp = new RegExp("a?");
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str = "babba";
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Expect.listEquals(["", "a", "", "", "a", ""],
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exp.allMatches(str).map((x) => x[0]).toList());
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// Check that allMatches works with optional start index.
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exp = new RegExp("as{2}");
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str = "assassin";
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Expect.equals(2, exp.allMatches(str).length);
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Expect.equals(2, exp.allMatches(str, 0).length);
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Expect.equals(1, exp.allMatches(str, 1).length);
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Expect.equals(0, exp.allMatches(str, 4).length);
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Expect.equals(0, exp.allMatches(str, str.length).length);
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Expect.throws(() => exp.allMatches(str, -1));
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Expect.throws(() => exp.allMatches(str, str.length + 1));
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exp = new RegExp(".*");
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Expect.equals("", exp.allMatches(str, str.length).single[0]);
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// The "^" must only match at the beginning of the string.
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// Using a start-index doesn't change where the string starts.
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exp = new RegExp("^ass");
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Expect.equals(1, exp.allMatches(str, 0).length);
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Expect.equals(0, exp.allMatches(str, 3).length);
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// Regression test for http://dartbug.com/2980
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exp = new RegExp("^", multiLine: true); // Any zero-length match will work.
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str = "foo\nbar\nbaz";
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Expect.equals(" foo\n bar\n baz", str.replaceAll(exp, " "));
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exp = new RegExp(r"(\w+)");
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Expect.isNull(exp.matchAsPrefix(" xyz ab"));
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Expect.isNull(exp.matchAsPrefix(" xyz ab", 0));
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var m = exp.matchAsPrefix(" xyz ab", 1);
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Expect.equals("xyz", m[0]);
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Expect.equals("xyz", m[1]);
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Expect.equals(1, m.groupCount);
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m = exp.matchAsPrefix(" xyz ab", 2);
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Expect.equals("yz", m[0]);
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Expect.equals("yz", m[1]);
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Expect.equals(1, m.groupCount);
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m = exp.matchAsPrefix(" xyz ab", 3);
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Expect.equals("z", m[0]);
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Expect.equals("z", m[1]);
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Expect.equals(1, m.groupCount);
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Expect.isNull(exp.matchAsPrefix(" xyz ab", 4));
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m = exp.matchAsPrefix(" xyz ab", 5);
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Expect.equals("ab", m[0]);
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Expect.equals("ab", m[1]);
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Expect.equals(1, m.groupCount);
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m = exp.matchAsPrefix(" xyz ab", 6);
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Expect.equals("b", m[0]);
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Expect.equals("b", m[1]);
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Expect.equals(1, m.groupCount);
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Expect.isNull(exp.matchAsPrefix(" xyz ab", 7));
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Expect.throws(() => exp.matchAsPrefix(" xyz ab", -1));
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Expect.throws(() => exp.matchAsPrefix(" xyz ab", 8));
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}
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