57 lines
1.8 KiB
JavaScript
57 lines
1.8 KiB
JavaScript
/**
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* @license
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* Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
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* This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
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* The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
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* The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
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* Code distributed by Google as part of the polymer project is also
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* subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
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*/
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// jshint node: true
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'use strict';
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var estraverse = require('estraverse');
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var esutil = require('./esutil');
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var numFeatures = 0;
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module.exports = function featureFinder() {
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/** @type {!Array<FeatureDescriptor>} The features we've found. */
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var features = [];
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var visitors = {
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enterCallExpression: function enterCallExpression(node, parent) {
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if (!esutil.matchesCallExpression(node.callee, ['Polymer', 'Base', '_addFeature'])) {
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return;
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}
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/** @type {!FeatureDescriptor} */
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var feature = {};
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this._extractDesc(feature, node, parent);
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this._extractProperties(feature, node, parent);
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features.push(feature);
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},
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_extractDesc: function _extractDesc(feature, node, parent) {
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feature.desc = esutil.getAttachedComment(parent);
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},
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_extractProperties: function _extractProperties(feature, node, parent) {
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var featureNode = node.arguments[0];
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if (featureNode.type !== 'ObjectExpression') {
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console.warn(
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'Expected first argument to Polymer.Base._addFeature to be an object.',
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'Got', featureNode.type, 'instead.');
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return;
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}
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if (!featureNode.properties) return;
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feature.properties = featureNode.properties.map(esutil.toPropertyDescriptor);
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},
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};
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return {visitors: visitors, features: features};
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};
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