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innerHTML.js
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innerHTML.js
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/**
@license
Copyright (c) 2016 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
*/
// Cribbed from ShadowDOM polyfill
// https://github.com/webcomponents/webcomponentsjs/blob/master/src/ShadowDOM/wrappers/HTMLElement.js#L28
/////////////////////////////////////////////////////////////////////////////
// innerHTML and outerHTML
// http://www.whatwg.org/specs/web-apps/current-work/multipage/the-end.html#escapingString
let escapeAttrRegExp = /[&\u00A0"]/g;
let escapeDataRegExp = /[&\u00A0<>]/g;
function escapeReplace(c) {
switch (c) {
case '&':
return '&';
case '<':
return '<';
case '>':
return '>';
case '"':
return '"';
case '\u00A0':
return ' ';
}
}
function escapeAttr(s) {
return s.replace(escapeAttrRegExp, escapeReplace);
}
function escapeData(s) {
return s.replace(escapeDataRegExp, escapeReplace);
}
function makeSet(arr) {
let set = {};
for (let i = 0; i < arr.length; i++) {
set[arr[i]] = true;
}
return set;
}
// http://www.whatwg.org/specs/web-apps/current-work/#void-elements
let voidElements = makeSet([
'area',
'base',
'br',
'col',
'command',
'embed',
'hr',
'img',
'input',
'keygen',
'link',
'meta',
'param',
'source',
'track',
'wbr',
]);
let plaintextParents = makeSet([
'style',
'script',
'xmp',
'iframe',
'noembed',
'noframes',
'plaintext',
'noscript',
]);
/**
* @param {Node} node
* @param {Node} parentNode
* @param {Function=} callback
*/
export function getOuterHTML(node, parentNode, callback) {
switch (node.nodeType) {
case Node.ELEMENT_NODE: {
let tagName = node.localName;
let s = '<' + tagName;
let attrs = node.attributes;
for (let i = 0, attr; (attr = attrs[i]); i++) {
s += ' ' + attr.name + '="' + escapeAttr(attr.value) + '"';
}
s += '>';
if (voidElements[tagName]) {
return s;
}
return s + getInnerHTML(node, callback) + '</' + tagName + '>';
}
case Node.TEXT_NODE: {
let data = /** @type {Text} */ (node).data;
if (parentNode && plaintextParents[parentNode.localName]) {
return data;
}
return escapeData(data);
}
case Node.COMMENT_NODE: {
return '<!--' + /** @type {Comment} */ (node).data + '-->';
}
default: {
window.console.error(node);
throw new Error('not implemented');
}
}
}
/**
* @param {Node} node
* @param {Function=} callback
*/
export function getInnerHTML(node, callback) {
if (node.localName === 'template') {
node = /** @type {HTMLTemplateElement} */ (node).content;
}
let s = '';
let c$ = callback ? callback(node) : node.childNodes;
for (let i = 0, l = c$.length, child; i < l && (child = c$[i]); i++) {
s += getOuterHTML(child, node, callback);
}
return s;
}