34 lines
599 B
JavaScript
34 lines
599 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 non-capturing empty groups.
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*
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* /(?:)a/ -> /a/
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* /a|(?:)/ -> /a|/
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*/
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module.exports = {
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Group: function Group(path) {
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var node = path.node,
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parent = path.parent;
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var childPath = path.getChild();
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if (node.capturing || childPath) {
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return;
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}
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if (parent.type === 'Repetition') {
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path.getParent().replace(node);
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} else if (parent.type !== 'RegExp') {
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path.remove();
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}
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}
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};
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