50 lines
1.4 KiB
JavaScript
50 lines
1.4 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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var compatTransforms = require('./transforms');
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var _transform = require('../transform');
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module.exports = {
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/**
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* Translates a regexp in new syntax to equivalent regexp in old syntax.
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*
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* @param string|RegExp|AST - regexp
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* @param Array transformsWhitelist - names of the transforms to apply
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*/
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transform: function transform(regexp) {
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var transformsWhitelist = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : [];
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var transformToApply = transformsWhitelist.length > 0 ? transformsWhitelist : Object.keys(compatTransforms);
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var result = void 0;
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// Collect extra data per transform.
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var extra = {};
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transformToApply.forEach(function (transformName) {
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if (!compatTransforms.hasOwnProperty(transformName)) {
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throw new Error('Unknown compat-transform: ' + transformName + '. ' + 'Available transforms are: ' + Object.keys(compatTransforms).join(', '));
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}
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var handler = compatTransforms[transformName];
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result = _transform.transform(regexp, handler);
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regexp = result.getAST();
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// Collect `extra` transform result.
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if (typeof handler.getExtra === 'function') {
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extra[transformName] = handler.getExtra();
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}
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});
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// Set the final extras for all transforms.
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result.setExtra(extra);
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return result;
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}
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};
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