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website/functions/node_modules/espurify/lib/clone-ast.js

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+'use strict';
+
+var isArray = require('core-js/library/fn/array/is-array');
+var objectKeys = require('core-js/library/fn/object/keys');
+var indexOf = require('core-js/library/fn/array/index-of');
+var Map = require('core-js/library/fn/map');
+var reduce = require('core-js/library/fn/array/reduce');
+
+module.exports = function cloneWithWhitelist (astWhiteList) {
+  var whitelist = reduce(objectKeys(astWhiteList), function (props, key) {
+    var propNames = astWhiteList[key];
+    var prepend = (indexOf(propNames, 'type') === -1) ? ['type'] : [];
+    props[key] = prepend.concat(propNames || []);
+    return props;
+  }, {});
+
+  function cloneNodeOrObject (obj, seen) {
+    var props = obj.type ? whitelist[obj.type] : null;
+    if (props) {
+      return cloneNode(obj, props, seen);
+    } else {
+      return cloneObject(obj, seen);
+    }
+  }
+
+  function cloneArray (ary, seen) {
+    var i = ary.length;
+    var clone = [];
+    while (i--) {
+      clone[i] = cloneOf(ary[i], seen);
+    }
+    return clone;
+  }
+
+  function cloneNode (node, props, seen) {
+    var i, len, key;
+    var clone = {};
+    for (i = 0, len = props.length; i < len; i += 1) {
+      key = props[i];
+      if (node.hasOwnProperty(key)) {
+        clone[key] = cloneOf(node[key], seen);
+      }
+    }
+    return clone;
+  }
+
+  function cloneObject (obj, seen) {
+    var props = objectKeys(obj);
+    var i, len, key, value;
+    var clone = {};
+    for (i = 0, len = props.length; i < len; i += 1) {
+      key = props[i];
+      value = obj[key];
+      if (seen.has(value)) {
+        continue;
+      }
+      clone[key] = cloneOf(value, seen);
+    }
+    return clone;
+  }
+
+  function cloneOf (val, seen) {
+    if (typeof val === 'object' && val !== null) {
+      seen.set(val, true);
+      if (val instanceof RegExp) {
+        return new RegExp(val);
+      } else if (isArray(val)) {
+        return cloneArray(val, seen);
+      } else {
+        return cloneNodeOrObject(val, seen);
+      }
+    } else {
+      return val;
+    }
+  }
+
+  function cloneRoot (obj) {
+    var seen = new Map();
+    seen.set(obj, true);
+    return cloneNodeOrObject(obj, seen);
+  }
+
+  return cloneRoot;
+};