121 lines
3.1 KiB
JavaScript
121 lines
3.1 KiB
JavaScript
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// Copyright 2024 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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//
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// Flags: --allow-natives-syntax --default-to-experimental-regexp-engine --experimental-regexp-engine-capture-group-opt
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// Tests captures in positive and negative look-ahead in regular expressions.
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function stringEscape(string) {
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// Converts string to source literal.
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return '"' + string.replace(/["\\]/g, '\\$1') + '"';
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}
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function testRE(re, input, expected_result) {
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assertEquals(%RegexpTypeTag(re), 'EXPERIMENTAL');
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var testName = re + '.test(' + stringEscape(input) + ')';
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if (expected_result) {
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assertTrue(re.test(input), testName);
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} else {
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assertFalse(re.test(input), testName);
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}
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}
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function execRE(re, input, expected_result) {
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assertEquals(%RegexpTypeTag(re), 'EXPERIMENTAL');
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var testName = re + ".exec('" + stringEscape(input) + "')";
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assertEquals(expected_result, re.exec(input), testName);
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}
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// Test of simple positive lookahead.
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var re = /^(?=a)/;
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testRE(re, 'a', true);
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testRE(re, 'b', false);
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execRE(re, 'a', ['']);
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re = /^(?=\woo)f\w/;
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testRE(re, 'foo', true);
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testRE(re, 'boo', false);
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testRE(re, 'fao', false);
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testRE(re, 'foa', false);
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execRE(re, 'foo', ['fo']);
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re = /(?=\w).(?=\W)/;
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testRE(re, '.a! ', true);
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testRE(re, '.! ', false);
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testRE(re, '.ab! ', true);
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execRE(re, '.ab! ', ['b']);
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re = /(?=f(?=[^f]o))../;
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testRE(re, ', foo!', true);
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testRE(re, ', fo!', false);
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testRE(re, ', ffo', false);
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execRE(re, ', foo!', ['fo']);
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re = /^(?:(?=(.))a|b|c)$/;
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testRE(re, 'a', true);
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testRE(re, 'b', true);
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testRE(re, 'c', true);
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testRE(re, 'd', false);
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execRE(re, 'a', ['a', 'a']);
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execRE(re, 'b', ['b', undefined]);
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execRE(re, 'c', ['c', undefined]);
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execRE(/^(?=(b))b/, 'b', ['b', 'b']);
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execRE(/^(?:(?=(b))|a)b/, 'ab', ['ab', undefined]);
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execRE(/^(?:(?=(b)(?:(?=(c))|d))|)bd/, 'bd', ['bd', 'b', undefined]);
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// Test of Negative Look-Ahead.
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re = /(?!x)./;
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testRE(re, 'y', true);
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testRE(re, 'x', false);
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execRE(re, 'y', ['y']);
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re = /(?!(\d))|\d/;
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testRE(re, '4', true);
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execRE(re, '4', ['4', undefined]);
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execRE(re, 'x', ['', undefined]);
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// Test mixed nested look-ahead with captures.
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re = /^(?=(x)(?=(y)))/;
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testRE(re, 'xy', true);
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testRE(re, 'xz', false);
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execRE(re, 'xy', ['', 'x', 'y']);
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re = /^(?!(x)(?!(y)))/;
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testRE(re, 'xy', true);
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testRE(re, 'xz', false);
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execRE(re, 'xy', ['', undefined, undefined]);
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re = /^(?=(x)(?!(y)))/;
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testRE(re, 'xz', true);
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testRE(re, 'xy', false);
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execRE(re, 'xz', ['', 'x', undefined]);
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re = /^(?!(x)(?=(y)))/;
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testRE(re, 'xz', true);
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testRE(re, 'xy', false);
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execRE(re, 'xz', ['', undefined, undefined]);
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re = /^(?=(x)(?!(y)(?=(z))))/;
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testRE(re, 'xaz', true);
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testRE(re, 'xya', true);
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testRE(re, 'xyz', false);
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testRE(re, 'a', false);
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execRE(re, 'xaz', ['', 'x', undefined, undefined]);
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execRE(re, 'xya', ['', 'x', undefined, undefined]);
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re = /^(?!(x)(?=(y)(?!(z))))/;
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testRE(re, 'a', true);
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testRE(re, 'xa', true);
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testRE(re, 'xyz', true);
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testRE(re, 'xya', false);
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execRE(re, 'a', ['', undefined, undefined, undefined]);
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execRE(re, 'xa', ['', undefined, undefined, undefined]);
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execRE(re, 'xyz', ['', undefined, undefined, undefined]);
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