52 lines
1.5 KiB
JavaScript
52 lines
1.5 KiB
JavaScript
/**
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* Copyright 2017 The AMP HTML Authors. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS-IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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/**
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* Finds and returns the first 'meta charset' element in the head.
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*
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* @param {Node} head the section to search for the meta charset node.
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* @returns {Node} the '<meta charset>' node or null.
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*/
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function findMetaViewport(head) {
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for (let node = head.firstChild; node !== null; node = node.nextSibling) {
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if (node.tagName === 'meta' && node.attribs.name === 'viewport') {
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return node;
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}
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}
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return null;
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}
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/**
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* Skips the subtree that is descending from the current node.
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* @param {Node} the node that has its subtree being skipped
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* @return {Node} the appropriate "next" node that will skip the current
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* subtree.
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*/
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function skipNodeAndChildren(node) {
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if (node.nextSibling) {
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return node.nextSibling;
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}
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return skipNodeAndChildren(node.parent);
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}
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/** @module HtmlDomHelper */
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module.exports = {
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findMetaViewport: findMetaViewport,
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skipNodeAndChildren: skipNodeAndChildren,
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};
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