58 lines
1 KiB
JavaScript
58 lines
1 KiB
JavaScript
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/**
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* The MIT License (MIT)
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* Copyright (c) 2017-present Dmitry Soshnikov <dmitry.soshnikov@gmail.com>
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*/
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'use strict';
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/**
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* A regexp-tree plugin to translate `/(?<name>a)\k<name>/` to `/(a)\1/`.
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*/
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module.exports = {
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// To track the names of the groups, and return them
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// in the transform result state.
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//
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// A map from name to number: {foo: 2, bar: 4}
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_groupNames: {},
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/**
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* Initialises the trasnform.
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*/
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init: function init() {
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this._groupNames = {};
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},
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/**
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* Returns extra state, which eventually is returned to
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*/
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getExtra: function getExtra() {
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return this._groupNames;
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},
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Group: function Group(path) {
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var node = path.node;
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if (!node.name) {
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return;
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}
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// Record group name.
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this._groupNames[node.name] = node.number;
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delete node.name;
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},
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Backreference: function Backreference(path) {
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var node = path.node;
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if (node.kind !== 'name') {
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return;
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}
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node.kind = 'number';
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node.reference = node.number;
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}
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};
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