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@@ -8,4 +8,4 @@ | |
| "fail": "aria-hidden=true should not be present on the document body" | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,18 @@ | ||
| /* global axe */ | ||
|
|
||
| /** | ||
| * Return the document or document fragment (shadow DOM) | ||
| * @method getRootNode | ||
| * @memberof axe.utils | ||
| * @instance | ||
| * @param {Element} node | ||
| * @returns {DocumentFragment|Document} | ||
| */ | ||
| axe.utils.getRootNode = function getRootNode(node) { | ||
| var doc = (node.getRootNode && node.getRootNode()) || document; // this is for backwards compatibility | ||
| if (doc === node) { | ||
| // disconnected node | ||
| doc = document; | ||
| } | ||
| return doc; | ||
| }; |
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| Original file line number | Diff line number | Diff line change |
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| /** | ||
| * Returns a then(able) queue of CSSStyleSheet(s) | ||
| * @param {Object} ownerDocument document object to be inspected for stylesheets | ||
| * @param {number} timeout on network request for stylesheet that need to be externally fetched | ||
| * @param {Function} convertTextToStylesheetFn a utility function to generate a style sheet from text | ||
| * @return {Object} queue | ||
| * @private | ||
| */ | ||
| function loadCssom({ root, shadowId }, timeout, convertTextToStylesheetFn) { | ||
| /** | ||
| * Make an axios get request to fetch a given resource and resolve | ||
| * @method getExternalStylesheet | ||
| * @private | ||
| * @param {Object} param an object with properties to configure the external XHR | ||
| * @property {Object} param.resolve resolve callback on queue | ||
| * @property {Object} param.reject reject callback on queue | ||
| * @property {String} param.url string representing the url of the resource to load | ||
| * @property {Number} param.timeout timeout to about network call | ||
| */ | ||
| function getExternalStylesheet({ resolve, reject, url }) { | ||
| axe.imports | ||
| .axios({ | ||
| method: 'get', | ||
| url, | ||
| timeout | ||
| }) | ||
| .then(({ data }) => { | ||
| const sheet = convertTextToStylesheetFn({ | ||
| data, | ||
| isExternal: true, | ||
| shadowId | ||
| }); | ||
| resolve(sheet); | ||
| }) | ||
| .catch(reject); | ||
| } | ||
|
|
||
| const q = axe.utils.queue(); | ||
|
|
||
| // iterate to decipher multi-level nested sheets if any (this is essential to retrieve styles from shadowDOM) | ||
| Array.from(root.styleSheets).forEach(sheet => { | ||
| // ignore disabled sheets | ||
| if (sheet.disabled) { | ||
| return; | ||
| } | ||
| // attempt to retrieve cssRules, or for external sheets make a XMLHttpRequest | ||
| try { | ||
| // accessing .cssRules throws for external (cross-domain) sheets, which is handled in the catch | ||
| const cssRules = sheet.cssRules; | ||
| // read all css rules in the sheet | ||
| const rules = Array.from(cssRules); | ||
|
|
||
| // filter rules that are included by way of @import or nested link | ||
| const importRules = rules.filter(r => r.href); | ||
|
|
||
| // if no import or nested link rules, with in these cssRules | ||
| // return current sheet | ||
| if (!importRules.length) { | ||
| q.defer(resolve => | ||
| resolve({ | ||
| sheet, | ||
| isExternal: false, | ||
| shadowId | ||
| }) | ||
| ); | ||
| return; | ||
| } | ||
|
|
||
| // if any import rules exists, fetch via `href` which eventually constructs a sheet with results from resource | ||
| importRules.forEach(rule => { | ||
| q.defer((resolve, reject) => { | ||
| getExternalStylesheet({ resolve, reject, url: rule.href }); | ||
| }); | ||
| }); | ||
|
|
||
| // in the same sheet - get inline rules in <style> tag or in a CSSStyleSheet excluding @import or nested link | ||
| const inlineRules = rules.filter(rule => !rule.href); | ||
|
|
||
| // concat all cssText into a string for inline rules | ||
| const inlineRulesCssText = inlineRules | ||
| .reduce((out, rule) => { | ||
| out.push(rule.cssText); | ||
| return out; | ||
| }, []) | ||
| .join(); | ||
| // create and return a sheet with inline rules | ||
| q.defer(resolve => | ||
| resolve( | ||
| convertTextToStylesheetFn({ | ||
| data: inlineRulesCssText, | ||
| shadowId, | ||
| isExternal: false | ||
| }) | ||
| ) | ||
| ); | ||
| } catch (e) { | ||
| // if no href, do not attempt to make an XHR, but this is preventive check | ||
| // NOTE: as further enhancements to resolve nested @imports are done, a decision to throw an Error if necessary here will be made. | ||
| if (!sheet.href) { | ||
| return; | ||
| } | ||
| // external sheet -> make an xhr and q the response | ||
| q.defer((resolve, reject) => { | ||
| getExternalStylesheet({ resolve, reject, url: sheet.href }); | ||
| }); | ||
| } | ||
| }, []); | ||
| // return | ||
| return q; | ||
| } | ||
|
|
||
| /** | ||
| * Returns an array of objects with root(document) | ||
| * @param {Object} treeRoot the DOM tree to be inspected | ||
| * @return {Array<Object>} array of objects, which each object containing a root (document) and an optional shadowId | ||
| * @private | ||
| */ | ||
| function getAllRootsInTree(tree) { | ||
| let ids = []; | ||
| const documents = axe.utils | ||
| .querySelectorAllFilter(tree, '*', node => { | ||
| if (ids.includes(node.shadowId)) { | ||
| return false; | ||
| } | ||
| ids.push(node.shadowId); | ||
| return true; | ||
| }) | ||
| .map(node => { | ||
| return { | ||
| shadowId: node.shadowId, | ||
| root: axe.utils.getRootNode(node.actualNode) | ||
| }; | ||
| }); | ||
| return documents; | ||
| } | ||
|
|
||
| /** | ||
| * @method preloadCssom | ||
| * @memberof axe.utils | ||
| * @instance | ||
| * @param {Object} object argument which is a composite object, with attributes timeout, treeRoot(optional), resolve & reject | ||
| * @property {Number} timeout timeout for any network calls made | ||
| * @property {Object} treeRoot the DOM tree to be inspected | ||
| * @return {Object} a queue with results of cssom assets | ||
| */ | ||
| axe.utils.preloadCssom = function preloadCssom({ | ||
| timeout, | ||
| treeRoot = axe._tree[0] | ||
| }) { | ||
| const roots = axe.utils.uniqueArray(getAllRootsInTree(treeRoot), []); | ||
| const q = axe.utils.queue(); | ||
|
|
||
| if (!roots.length) { | ||
| return q; | ||
| } | ||
|
|
||
| const dynamicDoc = document.implementation.createHTMLDocument(); | ||
|
|
||
| /** | ||
| * Convert text content to CSSStyleSheet | ||
| * @method convertTextToStylesheet | ||
| * @private | ||
| * @param {Object} param an object with properties to construct stylesheet | ||
| * @property {String} param.data text content of the stylesheet | ||
| * @property {Boolean} param.isExternal flag to notify if the resource was fetched from the network | ||
| * @property {Object} param.doc implementation document to create style elements | ||
| * @property {String} param.shadowId (Optional) shadowId if shadowDOM | ||
| */ | ||
| function convertTextToStylesheet({ data, isExternal, shadowId }) { | ||
| const style = dynamicDoc.createElement('style'); | ||
| style.type = 'text/css'; | ||
| style.appendChild(dynamicDoc.createTextNode(data)); | ||
| dynamicDoc.head.appendChild(style); | ||
| return { | ||
| sheet: style.sheet, | ||
| isExternal, | ||
| shadowId | ||
| }; | ||
| } | ||
|
|
||
| q.defer((resolve, reject) => { | ||
| // as there can be multiple documents (root document, shadow document fragments, and frame documents) | ||
| // reduce these into a queue | ||
| roots | ||
| .reduce((out, root) => { | ||
| out.defer((resolve, reject) => { | ||
| loadCssom(root, timeout, convertTextToStylesheet) | ||
| .then(resolve) | ||
| .catch(reject); | ||
| }); | ||
| return out; | ||
| }, axe.utils.queue()) | ||
| // await loading all such documents assets, and concat results into one object | ||
| .then(assets => { | ||
| resolve( | ||
| assets.reduce((out, cssomSheets) => { | ||
| return out.concat(cssomSheets); | ||
| }, []) | ||
| ); | ||
| }) | ||
| .catch(reject); | ||
| }); | ||
|
|
||
| return q; | ||
| }; |
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