indices-groups-properties.js

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// Copyright 2019 Ron Buckton. All rights reserved.

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

/*---

description: Properties of the groups object of indices are created with CreateDataProperty

includes: [compareArray.js, propertyHelper.js]

esid: sec-makeindicesarray

features: [regexp-named-groups, regexp-match-indices]

info: |

  MakeIndicesArray ( S, indices, groupNames, hasIndices )

    13. For each integer _i_ such that _i_ >= 0 and _i_ < _n_, do

      e. If _i_ > 0 and _groupNames_[_i_ - 1] is not *undefined*, then

        i. Perform ! CreateDataProperty(_groups_, _groupNames_[_i_ - 1], _matchIndicesArray_).

---*/

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

let groupNames = Object.getOwnPropertyNames(/(?<fst>.)|(?<snd>.)/du.exec("abcd").indices.groups);

assert.compareArray(groupNames, ["fst", "snd"]);

// Properties are created with Define, not Set

let counter = 0;

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

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

let groups = indices.groups;

assert.sameValue(counter, 0);

// Properties are writable, enumerable and configurable

// (from CreateDataProperty)

verifyProperty(groups, 'x', {

    writable: true,

    enumerable: true,

    configurable: true

});

reportCompare(0, 0);