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Viewing file:     createNodesFromMarkup.js (2.48 KB)      -rw-r--r--

"use strict";

/**
 * Copyright (c) 2013-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @typechecks
 */

/*eslint-disable fb-www/unsafe-html*/
var ExecutionEnvironment = require("./ExecutionEnvironment");

var createArrayFromMixed = require("./createArrayFromMixed");

var getMarkupWrap = require("./getMarkupWrap");

var invariant = require("./invariant");
/**
 * Dummy container used to render all markup.
 */


var dummyNode = ExecutionEnvironment.canUseDOM ? document.createElement('div') : null;
/**
 * Pattern used by `getNodeName`.
 */

var nodeNamePattern = /^\s*<(\w+)/;
/**
 * Extracts the `nodeName` of the first element in a string of markup.
 *
 * @param {string} markup String of markup.
 * @return {?string} Node name of the supplied markup.
 */

function getNodeName(markup) {
  var nodeNameMatch = markup.match(nodeNamePattern);
  return nodeNameMatch && nodeNameMatch[1].toLowerCase();
}
/**
 * Creates an array containing the nodes rendered from the supplied markup. The
 * optionally supplied `handleScript` function will be invoked once for each
 * <script> element that is rendered. If no `handleScript` function is supplied,
 * an exception is thrown if any <script> elements are rendered.
 *
 * @param {string} markup A string of valid HTML markup.
 * @param {?function} handleScript Invoked once for each rendered <script>.
 * @return {array<DOMElement|DOMTextNode>} An array of rendered nodes.
 */


function createNodesFromMarkup(markup, handleScript) {
  var node = dummyNode;
  !!!dummyNode ? process.env.NODE_ENV !== "production" ? invariant(false, 'createNodesFromMarkup dummy not initialized') : invariant(false) : void 0;
  var nodeName = getNodeName(markup);
  var wrap = nodeName && getMarkupWrap(nodeName);

  if (wrap) {
    node.innerHTML = wrap[1] + markup + wrap[2];
    var wrapDepth = wrap[0];

    while (wrapDepth--) {
      node = node.lastChild;
    }
  } else {
    node.innerHTML = markup;
  }

  var scripts = node.getElementsByTagName('script');

  if (scripts.length) {
    !handleScript ? process.env.NODE_ENV !== "production" ? invariant(false, 'createNodesFromMarkup(...): Unexpected <script> element rendered.') : invariant(false) : void 0;
    createArrayFromMixed(scripts).forEach(handleScript);
  }

  var nodes = Array.from(node.childNodes);

  while (node.lastChild) {
    node.removeChild(node.lastChild);
  }

  return nodes;
}

module.exports = createNodesFromMarkup;