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author | Florian Dold <florian.dold@gmail.com> | 2017-05-03 15:35:00 +0200 |
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committer | Florian Dold <florian.dold@gmail.com> | 2017-05-03 15:35:00 +0200 |
commit | de98e0b232509d5f40c135d540a70e415272ff85 (patch) | |
tree | a79222a5b58484ab3b80d18efcaaa7ccc4769b33 /node_modules/react-dom/lib/DOMLazyTree.js | |
parent | e0c9d480a73fa629c1e4a47d3e721f1d2d345406 (diff) |
node_modules
Diffstat (limited to 'node_modules/react-dom/lib/DOMLazyTree.js')
-rw-r--r-- | node_modules/react-dom/lib/DOMLazyTree.js | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/node_modules/react-dom/lib/DOMLazyTree.js b/node_modules/react-dom/lib/DOMLazyTree.js new file mode 100644 index 000000000..f2f64d5b0 --- /dev/null +++ b/node_modules/react-dom/lib/DOMLazyTree.js @@ -0,0 +1,117 @@ +/** + * Copyright 2015-present, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under the BSD-style license found in the + * LICENSE file in the root directory of this source tree. An additional grant + * of patent rights can be found in the PATENTS file in the same directory. + * + */ + +'use strict'; + +var DOMNamespaces = require('./DOMNamespaces'); +var setInnerHTML = require('./setInnerHTML'); + +var createMicrosoftUnsafeLocalFunction = require('./createMicrosoftUnsafeLocalFunction'); +var setTextContent = require('./setTextContent'); + +var ELEMENT_NODE_TYPE = 1; +var DOCUMENT_FRAGMENT_NODE_TYPE = 11; + +/** + * In IE (8-11) and Edge, appending nodes with no children is dramatically + * faster than appending a full subtree, so we essentially queue up the + * .appendChild calls here and apply them so each node is added to its parent + * before any children are added. + * + * In other browsers, doing so is slower or neutral compared to the other order + * (in Firefox, twice as slow) so we only do this inversion in IE. + * + * See https://github.com/spicyj/innerhtml-vs-createelement-vs-clonenode. + */ +var enableLazy = typeof document !== 'undefined' && typeof document.documentMode === 'number' || typeof navigator !== 'undefined' && typeof navigator.userAgent === 'string' && /\bEdge\/\d/.test(navigator.userAgent); + +function insertTreeChildren(tree) { + if (!enableLazy) { + return; + } + var node = tree.node; + var children = tree.children; + if (children.length) { + for (var i = 0; i < children.length; i++) { + insertTreeBefore(node, children[i], null); + } + } else if (tree.html != null) { + setInnerHTML(node, tree.html); + } else if (tree.text != null) { + setTextContent(node, tree.text); + } +} + +var insertTreeBefore = createMicrosoftUnsafeLocalFunction(function (parentNode, tree, referenceNode) { + // DocumentFragments aren't actually part of the DOM after insertion so + // appending children won't update the DOM. We need to ensure the fragment + // is properly populated first, breaking out of our lazy approach for just + // this level. Also, some <object> plugins (like Flash Player) will read + // <param> nodes immediately upon insertion into the DOM, so <object> + // must also be populated prior to insertion into the DOM. + if (tree.node.nodeType === DOCUMENT_FRAGMENT_NODE_TYPE || tree.node.nodeType === ELEMENT_NODE_TYPE && tree.node.nodeName.toLowerCase() === 'object' && (tree.node.namespaceURI == null || tree.node.namespaceURI === DOMNamespaces.html)) { + insertTreeChildren(tree); + parentNode.insertBefore(tree.node, referenceNode); + } else { + parentNode.insertBefore(tree.node, referenceNode); + insertTreeChildren(tree); + } +}); + +function replaceChildWithTree(oldNode, newTree) { + oldNode.parentNode.replaceChild(newTree.node, oldNode); + insertTreeChildren(newTree); +} + +function queueChild(parentTree, childTree) { + if (enableLazy) { + parentTree.children.push(childTree); + } else { + parentTree.node.appendChild(childTree.node); + } +} + +function queueHTML(tree, html) { + if (enableLazy) { + tree.html = html; + } else { + setInnerHTML(tree.node, html); + } +} + +function queueText(tree, text) { + if (enableLazy) { + tree.text = text; + } else { + setTextContent(tree.node, text); + } +} + +function toString() { + return this.node.nodeName; +} + +function DOMLazyTree(node) { + return { + node: node, + children: [], + html: null, + text: null, + toString: toString + }; +} + +DOMLazyTree.insertTreeBefore = insertTreeBefore; +DOMLazyTree.replaceChildWithTree = replaceChildWithTree; +DOMLazyTree.queueChild = queueChild; +DOMLazyTree.queueHTML = queueHTML; +DOMLazyTree.queueText = queueText; + +module.exports = DOMLazyTree;
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