groups-properties.js

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// Copyright 2017 the V8 project authors. All rights reserved.

// This code is governed by the BSD license found in the LICENSE file.

/*---

description: Properties of the groups object are created with CreateDataProperty

includes: [compareArray.js, propertyHelper.js]

esid: sec-regexpbuiltinexec

features: [regexp-named-groups]

info: |

  Runtime Semantics: RegExpBuiltinExec ( R, S )

    25. For each integer i such that i > 0 and i ≤ n

      f. If the ith capture of R was defined with a GroupName,

        i. Let s be the StringValue of the corresponding RegExpIdentifierName.

        ii. Perform ! CreateDataProperty(groups, s, capturedValue).

---*/

// Properties created on result.groups in textual order.

assert.compareArray(["fst", "snd"], Object.getOwnPropertyNames(

    /(?<fst>.)|(?<snd>.)/u.exec("abcd").groups));

// Properties are created with Define, not Set

let counter = 0;

Object.defineProperty(Object.prototype, 'x', {set() { counter++; }});

let match = /(?<x>.)/.exec('a');

let groups = match.groups;

assert.sameValue(counter, 0);

// Properties are writable, enumerable and configurable

// (from CreateDataProperty)

verifyWritable(groups, "x");

verifyEnumerable(groups, "x");

verifyConfigurable(groups, "x");

reportCompare(0, 0);