52 lines
1.8 KiB
JavaScript
52 lines
1.8 KiB
JavaScript
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// Copyright 2016 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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// Back reference does not end in the middle of a surrogate pair.
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function replace(string) {
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return string.replace(/L/g, "\ud800")
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.replace(/l/g, "\ud801")
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.replace(/T/g, "\udc00")
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.replace(/\./g, "[^]");
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}
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function test(expectation, regexp_source, subject) {
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if (expectation !== null) expectation = expectation.map(replace);
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subject = replace(subject);
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regexp_source = replace(regexp_source);
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assertEquals(expectation, new RegExp(regexp_source, "u").exec(subject));
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}
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// Back reference does not end in the middle of a surrogate pair.
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test(null, "(L)\\1", "LLT");
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test(["LLTLl", "L", "l"], "(L).*\\1(.)", "LLTLl");
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test(null, "(aL).*\\1", "aLaLT");
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test(["aLaLTaLl", "aL", "l"], "(aL).*\\1(.)", "aLaLTaLl");
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var s = "TabcLxLTabcLxTabcLTyTabcLz";
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test([s, "TabcL", "z"], "([^x]+).*\\1(.)", s);
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// Back reference does not start in the middle of a surrogate pair.
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test(["TLTabTc", "T", "c"], "(T).*\\1(.)", "TLTabTc");
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// Lookbehinds.
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test(null, "(?<=\\1(T)x)", "LTTx");
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test(["", "b", "T"], "(?<=(.)\\2.*(T)x)", "bTaLTTx");
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test(null, "(?<=\\1.*(L)x)", "LTLx");
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test(["", "b", "L"], "(?<=(.)\\2.*(L)x)", "bLaLTLx");
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test(null, "([^x]+)x*\\1", "LxLT");
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test(null, "([^x]+)x*\\1", "TxLT");
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test(null, "([^x]+)x*\\1", "LTxL");
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test(null, "([^x]+)x*\\1", "LTxT");
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test(null, "([^x]+)x*\\1", "xLxLT");
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test(null, "([^x]+)x*\\1", "xTxLT");
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test(null, "([^x]+)x*\\1", "xLTxL");
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test(null, "([^x]+)x*\\1", "xLTxT");
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test(null, "([^x]+)x*\\1", "xxxLxxLTxx");
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test(null, "([^x]+)x*\\1", "xxxTxxLTxx");
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test(null, "([^x]+)x*\\1", "xxxLTxxLxx");
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test(null, "([^x]+)x*\\1", "xxxLTxxTxx");
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test(["LTTxxLTT", "LTT"], "([^x]+)x*\\1", "xxxLTTxxLTTxx");
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