| // Copyright 2019 Ron Buckton. All rights reserved. | |
| // This code is governed by the BSD license found in the LICENSE file. | |
| /*--- | |
| description: An unmatched capture in a match corresponds to an unmatched capture in "indices" | |
| esid: sec-makeindicesarray | |
| features: [regexp-match-indices] | |
| info: | | |
| MakeIndicesArray ( S, indices, groupNames ) | |
| 4. Let _n_ be the number of elements in _indices_. | |
| ... | |
| 6. Set _A_ to ! ArrayCreate(_n_). | |
| ... | |
| 11. For each integer _i_ such that _i_ >= 0 and _i_ < _n_, do | |
| a. Let _matchIndices_ be _indices_[_i_]. | |
| b. If _matchIndices_ is not *undefined*, then | |
| i. Let _matchIndicesArray_ be ! GetMatchIndicesArray(_S_, _matchIndices_). | |
| c. Else, | |
| i. Let _matchIndicesArray_ be *undefined*. | |
| d. Perform ! CreateDataProperty(_A_, ! ToString(_n_), _matchIndicesArray_). | |
| ... | |
| ---*/ | |
| let input = "abd"; | |
| let match = /b(c)?/.exec(input); | |
| let indices = match.indices; | |
| // `indices` has the same length as match | |
| assert.sameValue(indices.length, match.length); | |
| // The second element of `indices` should be undefined. | |
| assert.sameValue(indices[1], undefined); |