367 lines
9.2 KiB
JavaScript
367 lines
9.2 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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var stylesInDom = {};
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var memoize = function (fn) {
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var memo;
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return function () {
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if (typeof memo === "undefined") memo = fn.apply(this, arguments);
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return memo;
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};
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};
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var isOldIE = memoize(function () {
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// Test for IE <= 9 as proposed by Browserhacks
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// @see http://browserhacks.com/#hack-e71d8692f65334173fee715c222cb805
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// Tests for existence of standard globals is to allow style-loader
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// to operate correctly into non-standard environments
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// @see https://github.com/webpack-contrib/style-loader/issues/177
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return window && document && document.all && !window.atob;
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});
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var getElement = (function (fn) {
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var memo = {};
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return function(selector) {
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if (typeof memo[selector] === "undefined") {
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var styleTarget = fn.call(this, selector);
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// Special case to return head of iframe instead of iframe itself
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if (styleTarget instanceof window.HTMLIFrameElement) {
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try {
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// This will throw an exception if access to iframe is blocked
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// due to cross-origin restrictions
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styleTarget = styleTarget.contentDocument.head;
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} catch(e) {
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styleTarget = null;
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}
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}
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memo[selector] = styleTarget;
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}
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return memo[selector]
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};
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})(function (target) {
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return document.querySelector(target)
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});
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var singleton = null;
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var singletonCounter = 0;
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var stylesInsertedAtTop = [];
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var fixUrls = require("./urls");
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module.exports = function(list, options) {
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if (typeof DEBUG !== "undefined" && DEBUG) {
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if (typeof document !== "object") throw new Error("The style-loader cannot be used in a non-browser environment");
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}
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options = options || {};
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options.attrs = typeof options.attrs === "object" ? options.attrs : {};
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// Force single-tag solution on IE6-9, which has a hard limit on the # of <style>
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// tags it will allow on a page
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if (!options.singleton) options.singleton = isOldIE();
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// By default, add <style> tags to the <head> element
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if (!options.insertInto) options.insertInto = "head";
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// By default, add <style> tags to the bottom of the target
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if (!options.insertAt) options.insertAt = "bottom";
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var styles = listToStyles(list, options);
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addStylesToDom(styles, options);
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return function update (newList) {
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var mayRemove = [];
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for (var i = 0; i < styles.length; i++) {
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var item = styles[i];
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var domStyle = stylesInDom[item.id];
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domStyle.refs--;
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mayRemove.push(domStyle);
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}
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if(newList) {
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var newStyles = listToStyles(newList, options);
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addStylesToDom(newStyles, options);
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}
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for (var i = 0; i < mayRemove.length; i++) {
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var domStyle = mayRemove[i];
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if(domStyle.refs === 0) {
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for (var j = 0; j < domStyle.parts.length; j++) domStyle.parts[j]();
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delete stylesInDom[domStyle.id];
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}
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}
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};
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};
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function addStylesToDom (styles, options) {
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for (var i = 0; i < styles.length; i++) {
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var item = styles[i];
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var domStyle = stylesInDom[item.id];
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if(domStyle) {
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domStyle.refs++;
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for(var j = 0; j < domStyle.parts.length; j++) {
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domStyle.parts[j](item.parts[j]);
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}
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for(; j < item.parts.length; j++) {
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domStyle.parts.push(addStyle(item.parts[j], options));
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}
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} else {
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var parts = [];
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for(var j = 0; j < item.parts.length; j++) {
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parts.push(addStyle(item.parts[j], options));
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}
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stylesInDom[item.id] = {id: item.id, refs: 1, parts: parts};
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}
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}
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}
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function listToStyles (list, options) {
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var styles = [];
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var newStyles = {};
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for (var i = 0; i < list.length; i++) {
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var item = list[i];
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var id = options.base ? item[0] + options.base : item[0];
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var css = item[1];
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var media = item[2];
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var sourceMap = item[3];
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var part = {css: css, media: media, sourceMap: sourceMap};
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if(!newStyles[id]) styles.push(newStyles[id] = {id: id, parts: [part]});
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else newStyles[id].parts.push(part);
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}
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return styles;
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}
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function insertStyleElement (options, style) {
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var target = getElement(options.insertInto)
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if (!target) {
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throw new Error("Couldn't find a style target. This probably means that the value for the 'insertInto' parameter is invalid.");
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}
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var lastStyleElementInsertedAtTop = stylesInsertedAtTop[stylesInsertedAtTop.length - 1];
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if (options.insertAt === "top") {
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if (!lastStyleElementInsertedAtTop) {
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target.insertBefore(style, target.firstChild);
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} else if (lastStyleElementInsertedAtTop.nextSibling) {
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target.insertBefore(style, lastStyleElementInsertedAtTop.nextSibling);
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} else {
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target.appendChild(style);
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}
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stylesInsertedAtTop.push(style);
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} else if (options.insertAt === "bottom") {
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target.appendChild(style);
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} else if (typeof options.insertAt === "object" && options.insertAt.before) {
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var nextSibling = getElement(options.insertInto + " " + options.insertAt.before);
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target.insertBefore(style, nextSibling);
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} else {
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throw new Error("[Style Loader]\n\n Invalid value for parameter 'insertAt' ('options.insertAt') found.\n Must be 'top', 'bottom', or Object.\n (https://github.com/webpack-contrib/style-loader#insertat)\n");
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}
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}
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function removeStyleElement (style) {
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if (style.parentNode === null) return false;
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style.parentNode.removeChild(style);
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var idx = stylesInsertedAtTop.indexOf(style);
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if(idx >= 0) {
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stylesInsertedAtTop.splice(idx, 1);
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}
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}
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function createStyleElement (options) {
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var style = document.createElement("style");
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options.attrs.type = "text/css";
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addAttrs(style, options.attrs);
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insertStyleElement(options, style);
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return style;
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}
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function createLinkElement (options) {
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var link = document.createElement("link");
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options.attrs.type = "text/css";
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options.attrs.rel = "stylesheet";
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addAttrs(link, options.attrs);
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insertStyleElement(options, link);
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return link;
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}
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function addAttrs (el, attrs) {
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Object.keys(attrs).forEach(function (key) {
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el.setAttribute(key, attrs[key]);
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});
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}
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function addStyle (obj, options) {
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var style, update, remove, result;
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// If a transform function was defined, run it on the css
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if (options.transform && obj.css) {
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result = options.transform(obj.css);
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if (result) {
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// If transform returns a value, use that instead of the original css.
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// This allows running runtime transformations on the css.
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obj.css = result;
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} else {
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// If the transform function returns a falsy value, don't add this css.
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// This allows conditional loading of css
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return function() {
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// noop
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};
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}
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}
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if (options.singleton) {
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var styleIndex = singletonCounter++;
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style = singleton || (singleton = createStyleElement(options));
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update = applyToSingletonTag.bind(null, style, styleIndex, false);
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remove = applyToSingletonTag.bind(null, style, styleIndex, true);
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} else if (
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obj.sourceMap &&
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typeof URL === "function" &&
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typeof URL.createObjectURL === "function" &&
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typeof URL.revokeObjectURL === "function" &&
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typeof Blob === "function" &&
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typeof btoa === "function"
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) {
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style = createLinkElement(options);
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update = updateLink.bind(null, style, options);
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remove = function () {
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removeStyleElement(style);
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if(style.href) URL.revokeObjectURL(style.href);
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};
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} else {
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style = createStyleElement(options);
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update = applyToTag.bind(null, style);
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remove = function () {
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removeStyleElement(style);
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};
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}
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update(obj);
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return function updateStyle (newObj) {
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if (newObj) {
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if (
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newObj.css === obj.css &&
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newObj.media === obj.media &&
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newObj.sourceMap === obj.sourceMap
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) {
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return;
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}
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update(obj = newObj);
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} else {
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remove();
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}
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};
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}
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var replaceText = (function () {
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var textStore = [];
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return function (index, replacement) {
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textStore[index] = replacement;
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return textStore.filter(Boolean).join('\n');
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};
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})();
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function applyToSingletonTag (style, index, remove, obj) {
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var css = remove ? "" : obj.css;
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if (style.styleSheet) {
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style.styleSheet.cssText = replaceText(index, css);
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} else {
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var cssNode = document.createTextNode(css);
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var childNodes = style.childNodes;
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if (childNodes[index]) style.removeChild(childNodes[index]);
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if (childNodes.length) {
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style.insertBefore(cssNode, childNodes[index]);
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} else {
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style.appendChild(cssNode);
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}
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}
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}
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function applyToTag (style, obj) {
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var css = obj.css;
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var media = obj.media;
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if(media) {
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style.setAttribute("media", media)
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}
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if(style.styleSheet) {
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style.styleSheet.cssText = css;
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} else {
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while(style.firstChild) {
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style.removeChild(style.firstChild);
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}
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style.appendChild(document.createTextNode(css));
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}
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}
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function updateLink (link, options, obj) {
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var css = obj.css;
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var sourceMap = obj.sourceMap;
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/*
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If convertToAbsoluteUrls isn't defined, but sourcemaps are enabled
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and there is no publicPath defined then lets turn convertToAbsoluteUrls
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on by default. Otherwise default to the convertToAbsoluteUrls option
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directly
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*/
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var autoFixUrls = options.convertToAbsoluteUrls === undefined && sourceMap;
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if (options.convertToAbsoluteUrls || autoFixUrls) {
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css = fixUrls(css);
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}
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if (sourceMap) {
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// http://stackoverflow.com/a/26603875
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css += "\n/*# sourceMappingURL=data:application/json;base64," + btoa(unescape(encodeURIComponent(JSON.stringify(sourceMap)))) + " */";
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}
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var blob = new Blob([css], { type: "text/css" });
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var oldSrc = link.href;
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link.href = URL.createObjectURL(blob);
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if(oldSrc) URL.revokeObjectURL(oldSrc);
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}
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