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