117 lines
3.0 KiB
JavaScript
117 lines
3.0 KiB
JavaScript
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/*
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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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module.exports = function(list) {
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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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var styles = listToStyles(list);
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addStylesToDom(styles);
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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);
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addStylesToDom(newStyles);
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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++)
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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) {
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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]));
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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]));
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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) {
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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 = 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])
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styles.push(newStyles[id] = {id: id, parts: [part]});
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else
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newStyles[id].parts.push(part);
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}
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return styles;
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}
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function addStyle(obj) {
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var styleElement = document.createElement("style");
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var head = document.head || document.getElementsByTagName("head")[0];
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styleElement.type = "text/css";
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head.appendChild(styleElement);
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applyToTag(styleElement, obj);
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return function(newObj) {
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if(newObj) {
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if(newObj.css === obj.css && newObj.media === obj.media /*&& newObj.sourceMap === obj.sourceMap*/)
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return;
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applyToTag(styleElement, obj = newObj);
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} else {
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head.removeChild(styleElement);
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}
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};
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};
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function applyToTag(styleElement, obj) {
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var css = obj.css;
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var media = obj.media;
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// var sourceMap = obj.sourceMap;
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// No browser support
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// if(sourceMap && typeof btoa === "function") {
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// try {
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// css += "\n/*# sourceMappingURL=data:application/json;base64," + btoa(JSON.stringify(sourceMap)) + " */";
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// } catch(e) {}
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// }
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if(media) {
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styleElement.setAttribute("media", media)
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}
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if (styleElement.styleSheet) {
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styleElement.styleSheet.cssText = css;
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} else {
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while(styleElement.firstChild) {
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styleElement.removeChild(styleElement.firstChild);
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}
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styleElement.appendChild(document.createTextNode(css));
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}
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}
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