WIP - add extractor, generate snippet_data

node_modules/css-loader/lib/css-base.js

@@ -0,0 +1,76 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+// css base code, injected by the css-loader
+module.exports = function(useSourceMap) {
+	var list = [];
+
+	// return the list of modules as css string
+	list.toString = function toString() {
+		return this.map(function (item) {
+			var content = cssWithMappingToString(item, useSourceMap);
+			if(item[2]) {
+				return "@media " + item[2] + "{" + content + "}";
+			} else {
+				return content;
+			}
+		}).join("");
+	};
+
+	// import a list of modules into the list
+	list.i = function(modules, mediaQuery) {
+		if(typeof modules === "string")
+			modules = [[null, modules, ""]];
+		var alreadyImportedModules = {};
+		for(var i = 0; i < this.length; i++) {
+			var id = this[i][0];
+			if(typeof id === "number")
+				alreadyImportedModules[id] = true;
+		}
+		for(i = 0; i < modules.length; i++) {
+			var item = modules[i];
+			// skip already imported module
+			// this implementation is not 100% perfect for weird media query combinations
+			//  when a module is imported multiple times with different media queries.
+			//  I hope this will never occur (Hey this way we have smaller bundles)
+			if(typeof item[0] !== "number" || !alreadyImportedModules[item[0]]) {
+				if(mediaQuery && !item[2]) {
+					item[2] = mediaQuery;
+				} else if(mediaQuery) {
+					item[2] = "(" + item[2] + ") and (" + mediaQuery + ")";
+				}
+				list.push(item);
+			}
+		}
+	};
+	return list;
+};
+
+function cssWithMappingToString(item, useSourceMap) {
+	var content = item[1] || '';
+	var cssMapping = item[3];
+	if (!cssMapping) {
+		return content;
+	}
+
+	if (useSourceMap && typeof btoa === 'function') {
+		var sourceMapping = toComment(cssMapping);
+		var sourceURLs = cssMapping.sources.map(function (source) {
+			return '/*# sourceURL=' + cssMapping.sourceRoot + source + ' */'
+		});
+
+		return [content].concat(sourceURLs).concat([sourceMapping]).join('\n');
+	}
+
+	return [content].join('\n');
+}
+
+// Adapted from convert-source-map (MIT)
+function toComment(sourceMap) {
+	// eslint-disable-next-line no-undef
+	var base64 = btoa(unescape(encodeURIComponent(JSON.stringify(sourceMap))));
+	var data = 'sourceMappingURL=data:application/json;charset=utf-8;base64,' + base64;
+
+	return '/*# ' + data + ' */';
+}