91 lines
2.8 KiB
Plaintext
91 lines
2.8 KiB
Plaintext
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/**
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* Copyright (c) 2013-present, Facebook, Inc.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @providesModule getMarkupWrap
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*/
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/*eslint-disable fb-www/unsafe-html */
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const ExecutionEnvironment = require('./ExecutionEnvironment');
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const invariant = require('./invariant');
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/**
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* Dummy container used to detect which wraps are necessary.
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*/
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const dummyNode = ExecutionEnvironment.canUseDOM ? document.createElement('div') : null;
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/**
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* Some browsers cannot use `innerHTML` to render certain elements standalone,
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* so we wrap them, render the wrapped nodes, then extract the desired node.
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*
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* In IE8, certain elements cannot render alone, so wrap all elements ('*').
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*/
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const shouldWrap = {};
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const selectWrap = [1, '<select multiple="true">', '</select>'];
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const tableWrap = [1, '<table>', '</table>'];
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const trWrap = [3, '<table><tbody><tr>', '</tr></tbody></table>'];
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const svgWrap = [1, '<svg xmlns="http://www.w3.org/2000/svg">', '</svg>'];
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const markupWrap = {
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'*': [1, '?<div>', '</div>'],
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'area': [1, '<map>', '</map>'],
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'col': [2, '<table><tbody></tbody><colgroup>', '</colgroup></table>'],
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'legend': [1, '<fieldset>', '</fieldset>'],
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'param': [1, '<object>', '</object>'],
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'tr': [2, '<table><tbody>', '</tbody></table>'],
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'optgroup': selectWrap,
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'option': selectWrap,
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'caption': tableWrap,
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'colgroup': tableWrap,
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'tbody': tableWrap,
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'tfoot': tableWrap,
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'thead': tableWrap,
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'td': trWrap,
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'th': trWrap
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};
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// Initialize the SVG elements since we know they'll always need to be wrapped
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// consistently. If they are created inside a <div> they will be initialized in
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// the wrong namespace (and will not display).
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const svgElements = ['circle', 'clipPath', 'defs', 'ellipse', 'g', 'image', 'line', 'linearGradient', 'mask', 'path', 'pattern', 'polygon', 'polyline', 'radialGradient', 'rect', 'stop', 'text', 'tspan'];
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svgElements.forEach(nodeName => {
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markupWrap[nodeName] = svgWrap;
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shouldWrap[nodeName] = true;
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});
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/**
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* Gets the markup wrap configuration for the supplied `nodeName`.
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*
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* NOTE: This lazily detects which wraps are necessary for the current browser.
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*
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* @param {string} nodeName Lowercase `nodeName`.
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* @return {?array} Markup wrap configuration, if applicable.
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*/
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function getMarkupWrap(nodeName) {
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invariant(!!dummyNode, 'Markup wrapping node not initialized');
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if (!markupWrap.hasOwnProperty(nodeName)) {
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nodeName = '*';
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}
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if (!shouldWrap.hasOwnProperty(nodeName)) {
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if (nodeName === '*') {
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dummyNode.innerHTML = '<link />';
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} else {
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dummyNode.innerHTML = '<' + nodeName + '></' + nodeName + '>';
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}
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shouldWrap[nodeName] = !dummyNode.firstChild;
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}
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return shouldWrap[nodeName] ? markupWrap[nodeName] : null;
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}
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module.exports = getMarkupWrap;
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