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build/node_modules/hydrolysis/lib/ast-utils/js-parse.js

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+/**
+ * @license
+ * Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
+ * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+ * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+ * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+ * Code distributed by Google as part of the polymer project is also
+ * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+ */
+/**
+* Finds and annotates the Polymer() and modulate() calls in javascript.
+*/
+// jshint node: true
+'use strict';
+var espree = require('espree');
+var estraverse = require('estraverse');
+
+var behaviorFinder = require('./behavior-finder');
+var elementFinder  = require('./element-finder');
+var featureFinder  = require('./feature-finder');
+
+function traverse(visitorRegistries) {
+  var visitor;
+  function applyVisitors(name, node, parent) {
+    var returnVal;
+    for (var i = 0; i < visitorRegistries.length; i++) {
+      if (name in visitorRegistries[i]) {
+        returnVal = visitorRegistries[i][name](node, parent);
+        if (returnVal) {
+          return returnVal;
+        }
+      }
+    }
+  }
+  return {
+    enter: function(node, parent) {
+      visitor = 'enter' + node.type;
+      return applyVisitors(visitor, node, parent);
+    },
+    leave: function(node, parent) {
+      visitor = 'leave' + node.type;
+      return applyVisitors(visitor, node, parent);
+    },
+    fallback: 'iteration',
+  };
+}
+
+var jsParse = function jsParse(jsString) {
+  var script = espree.parse(jsString, {
+    attachComment: true,
+    comment: true,
+    loc: true,
+    ecmaFeatures: {
+      arrowFunctions: true,
+      blockBindings: true,
+      destructuring: true,
+      regexYFlag: true,
+      regexUFlag: true,
+      templateStrings: true,
+      binaryLiterals: true,
+      unicodeCodePointEscapes: true,
+      defaultParams: true,
+      restParams: true,
+      forOf: true,
+      objectLiteralComputedProperties: true,
+      objectLiteralShorthandMethods: true,
+      objectLiteralShorthandProperties: true,
+      objectLiteralDuplicateProperties: true,
+      generators: true,
+      spread: true,
+      classes: true,
+      modules: true,
+      jsx: true,
+      globalReturn: true,
+    }
+  });
+
+  var featureInfo = featureFinder();
+  var behaviorInfo = behaviorFinder();
+  var elementInfo = elementFinder();
+
+  var visitors = [featureInfo, behaviorInfo, elementInfo].map(function(info) {
+    return info.visitors;
+  });
+  estraverse.traverse(script, traverse(visitors));
+
+  return {
+    behaviors: behaviorInfo.behaviors,
+    elements:  elementInfo.elements,
+    features:  featureInfo.features,
+    parsedScript: script
+  };
+};
+
+module.exports = jsParse;