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48 lines
2.2 KiB
JavaScript
48 lines
2.2 KiB
JavaScript
// Copyright 2017 the V8 project authors. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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description: Named backreferences in Unicode RegExps
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esid: sec-atomescape
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info: |
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The production AtomEscape :: [+N] k GroupName evaluates as follows:
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1. Search the enclosing RegExp for an instance of a GroupSpecifier for an
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RegExpIdentifierName which has a StringValue equal to the StringValue
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of the RegExpIdentifierName contained in GroupName.
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2. Assert: A unique such GroupSpecifier is found.
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3. Let parenIndex be the number of left capturing parentheses in the entire
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regular expression that occur to the left of the located GroupSpecifier.
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This is the total number of times the Atom::(GroupSpecifierDisjunction)
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production is expanded prior to that production's Term plus the total
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number of Atom :: (GroupSpecifierDisjunction) productions enclosing this Term.
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4. Call BackreferenceMatcher(parenIndex) and return its Matcher result.
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features: [regexp-named-groups]
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includes: [compareArray.js]
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---*/
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// Named references.
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assert(compareArray(["bab", "b"], "bab".match(/(?<b>.).\k<b>/u)));
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assert.sameValue(null, "baa".match(/(?<b>.).\k<b>/u));
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// Reference inside group.
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assert(compareArray(["bab", "b"], "bab".match(/(?<a>\k<a>\w)../u)));
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assert.sameValue("b", "bab".match(/(?<a>\k<a>\w)../u).groups.a);
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// Reference before group.
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assert(compareArray(["bab", "b"], "bab".match(/\k<a>(?<a>b)\w\k<a>/u)));
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assert.sameValue("b", "bab".match(/\k<a>(?<a>b)\w\k<a>/u).groups.a);
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assert(compareArray(["bab", "b", "a"], "bab".match(/(?<b>b)\k<a>(?<a>a)\k<b>/u)));
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let {a, b} = "bab".match(/(?<b>b)\k<a>(?<a>a)\k<b>/u).groups;
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assert.sameValue(a, "a");
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assert.sameValue(b, "b");
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assert(compareArray(["bab", "b"], "bab".match(/\k<a>(?<a>b)\w\k<a>/)));
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assert(compareArray(["bab", "b", "a"], "bab".match(/(?<b>b)\k<a>(?<a>a)\k<b>/)));
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// Reference properties.
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assert.sameValue("a", /(?<a>a)(?<b>b)\k<a>/u.exec("aba").groups.a);
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assert.sameValue("b", /(?<a>a)(?<b>b)\k<a>/u.exec("aba").groups.b);
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assert.sameValue(undefined, /(?<a>a)(?<b>b)\k<a>/u.exec("aba").groups.c);
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assert.sameValue(undefined, /(?<a>a)(?<b>b)\k<a>|(?<c>c)/u.exec("aba").groups.c);
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