858f2bdf5
 Boyan Georgiev
fixes
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"use strict";
const cssom = require("cssom");
const whatwgEncoding = require("whatwg-encoding");
const whatwgURL = require("whatwg-url");
// TODO: this should really implement https://html.spec.whatwg.org/multipage/links.html#link-type-stylesheet
// It (and the things it calls) is nowhere close right now.
exports.fetchStylesheet = (elementImpl, urlString) => {
const parsedURL = whatwgURL.parseURL(urlString);
return fetchStylesheetInternal(elementImpl, urlString, parsedURL);
};
// https://drafts.csswg.org/cssom/#remove-a-css-style-sheet
exports.removeStylesheet = (sheet, elementImpl) => {
const { styleSheets } = elementImpl._ownerDocument;
styleSheets.splice(styleSheets.indexOf(sheet, 1));
// Remove the association explicitly; in the spec it's implicit so this step doesn't exist.
elementImpl.sheet = null;
// TODO: "Set the CSS style sheet’s parent CSS style sheet, owner node and owner CSS rule to null."
// Probably when we have a real CSSOM implementation.
};
// https://drafts.csswg.org/cssom/#create-a-css-style-sheet kinda:
// - Parsing failures are not handled gracefully like they should be
// - The import rules stuff seems out of place, and probably should affect the load event...
exports.createStylesheet = (sheetText, elementImpl, baseURL) => {
let sheet;
try {
sheet = cssom.parse(sheetText);
} catch (e) {
if (elementImpl._ownerDocument._defaultView) {
const error = new Error("Could not parse CSS stylesheet");
error.detail = sheetText;
error.type = "css parsing";
elementImpl._ownerDocument._defaultView._virtualConsole.emit("jsdomError", error);
}
return;
}
scanForImportRules(elementImpl, sheet.cssRules, baseURL);
addStylesheet(sheet, elementImpl);
};
// https://drafts.csswg.org/cssom/#add-a-css-style-sheet
function addStylesheet(sheet, elementImpl) {
elementImpl._ownerDocument.styleSheets.push(sheet);
// Set the association explicitly; in the spec it's implicit.
elementImpl.sheet = sheet;
// TODO: title and disabled stuff
}
function fetchStylesheetInternal(elementImpl, urlString, parsedURL) {
const document = elementImpl._ownerDocument;
let defaultEncoding = document._encoding;
const resourceLoader = document._resourceLoader;
if (elementImpl.localName === "link" && elementImpl.hasAttributeNS(null, "charset")) {
defaultEncoding = whatwgEncoding.labelToName(elementImpl.getAttributeNS(null, "charset"));
}
function onStylesheetLoad(data) {
const css = whatwgEncoding.decode(data, defaultEncoding);
// TODO: MIME type checking?
if (elementImpl.sheet) {
exports.removeStylesheet(elementImpl.sheet, elementImpl);
}
exports.createStylesheet(css, elementImpl, parsedURL);
}
resourceLoader.fetch(urlString, {
element: elementImpl,
onLoad: onStylesheetLoad
});
}
// TODO this is actually really messed up and overwrites the sheet on elementImpl
// Tracking in https://github.com/jsdom/jsdom/issues/2124
function scanForImportRules(elementImpl, cssRules, baseURL) {
if (!cssRules) {
return;
}
for (let i = 0; i < cssRules.length; ++i) {
if (cssRules[i].cssRules) {
// @media rule: keep searching inside it.
scanForImportRules(elementImpl, cssRules[i].cssRules, baseURL);
} else if (cssRules[i].href) {
// @import rule: fetch the resource and evaluate it.
// See http://dev.w3.org/csswg/cssom/#css-import-rule
// If loading of the style sheet fails its cssRules list is simply
// empty. I.e. an @import rule always has an associated style sheet.
const parsed = whatwgURL.parseURL(cssRules[i].href, { baseURL });
if (parsed === null) {
const window = elementImpl._ownerDocument._defaultView;
if (window) {
const error = new Error(`Could not parse CSS @import URL ${cssRules[i].href} relative to base URL ` +
`"${whatwgURL.serializeURL(baseURL)}"`);
error.type = "css @import URL parsing";
window._virtualConsole.emit("jsdomError", error);
}
} else {
fetchStylesheetInternal(elementImpl, whatwgURL.serializeURL(parsed), parsed);
}
}
}
}
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