33 lines
702 B
JavaScript
33 lines
702 B
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 remove duplicates from character classes.
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*/
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module.exports = {
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CharacterClass: function CharacterClass(path) {
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var node = path.node;
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var sources = {};
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for (var i = 0; i < node.expressions.length; i++) {
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var childPath = path.getChild(i);
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var source = childPath.jsonEncode();
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if (sources.hasOwnProperty(source)) {
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childPath.remove();
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// Since we remove the current node.
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// TODO: make it simpler for users with a method.
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i--;
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}
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sources[source] = true;
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}
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}
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};
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