chushihua

node_modules/css-loader/lib/processCss.js

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+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+var formatCodeFrame = require("babel-code-frame");
+var Tokenizer = require("css-selector-tokenizer");
+var postcss = require("postcss");
+var loaderUtils = require("loader-utils");
+var assign = require("object-assign");
+var getLocalIdent = require("./getLocalIdent");
+
+var icssUtils = require('icss-utils');
+var localByDefault = require("postcss-modules-local-by-default");
+var extractImports = require("postcss-modules-extract-imports");
+var modulesScope = require("postcss-modules-scope");
+var modulesValues = require("postcss-modules-values");
+var valueParser = require('postcss-value-parser');
+
+var parserPlugin = postcss.plugin("css-loader-parser", function(options) {
+	return function(css) {
+		var imports = {};
+		var exports = {};
+		var importItems = [];
+		var urlItems = [];
+
+		function replaceImportsInString(str) {
+			if(options.import) {
+				var tokens = valueParser(str);
+				tokens.walk(function (node) {
+					if (node.type !== 'word') {
+						return;
+					}
+					var token = node.value;
+					var importIndex = imports["$" + token];
+					if(typeof importIndex === "number") {
+						node.value = "___CSS_LOADER_IMPORT___" + importIndex + "___";
+					}
+				})
+				return tokens.toString();
+			}
+			return str;
+		}
+
+		if(options.import) {
+			css.walkAtRules(/^import$/i, function(rule) {
+				var values = Tokenizer.parseValues(rule.params);
+				var url = values.nodes[0].nodes[0];
+				if(url && url.type === "url") {
+					url = url.url;
+				} else if(url && url.type === "string") {
+					url = url.value;
+				} else throw rule.error("Unexpected format " + rule.params);
+				if (!url.replace(/\s/g, '').length) {
+					return;
+				}
+				values.nodes[0].nodes.shift();
+				var mediaQuery = Tokenizer.stringifyValues(values);
+
+				if(loaderUtils.isUrlRequest(url, options.root)) {
+					url = loaderUtils.urlToRequest(url, options.root);
+				}
+
+				importItems.push({
+					url: url,
+					mediaQuery: mediaQuery
+				});
+				rule.remove();
+			});
+		}
+
+		var icss = icssUtils.extractICSS(css);
+		exports = icss.icssExports;
+		Object.keys(icss.icssImports).forEach(function(key) {
+			var url = loaderUtils.parseString(key);
+			Object.keys(icss.icssImports[key]).forEach(function(prop) {
+				imports["$" + prop] = importItems.length;
+				importItems.push({
+					url: url,
+					export: icss.icssImports[key][prop]
+				});
+			})
+		});
+
+		Object.keys(exports).forEach(function(exportName) {
+			exports[exportName] = replaceImportsInString(exports[exportName]);
+		});
+
+		function isAlias(url) {
+			// Handle alias starting by / and root disabled
+			return url !== options.resolve(url)
+		}
+
+		function processNode(item) {
+			switch (item.type) {
+				case "value":
+					item.nodes.forEach(processNode);
+					break;
+				case "nested-item":
+					item.nodes.forEach(processNode);
+					break;
+				case "item":
+					var importIndex = imports["$" + item.name];
+					if (typeof importIndex === "number") {
+						item.name = "___CSS_LOADER_IMPORT___" + importIndex + "___";
+					}
+					break;
+				case "url":
+					if (options.url && item.url.replace(/\s/g, '').length && !/^#/.test(item.url) && (isAlias(item.url) || loaderUtils.isUrlRequest(item.url, options.root))) {
+						// Strip quotes, they will be re-added if the module needs them
+						item.stringType = "";
+						delete item.innerSpacingBefore;
+						delete item.innerSpacingAfter;
+						var url = item.url;
+						item.url = "___CSS_LOADER_URL___" + urlItems.length + "___";
+						urlItems.push({
+							url: url
+						});
+					}
+					break;
+			}
+		}
+
+		css.walkDecls(function(decl) {
+			var values = Tokenizer.parseValues(decl.value);
+			values.nodes.forEach(function(value) {
+				value.nodes.forEach(processNode);
+			});
+			decl.value = Tokenizer.stringifyValues(values);
+		});
+		css.walkAtRules(function(atrule) {
+			if(typeof atrule.params === "string") {
+				atrule.params = replaceImportsInString(atrule.params);
+			}
+		});
+
+		options.importItems = importItems;
+		options.urlItems = urlItems;
+		options.exports = exports;
+	};
+});
+
+module.exports = function processCss(inputSource, inputMap, options, callback) {
+	var query = options.query;
+	var root = query.root && query.root.length > 0 ? query.root.replace(/\/$/, "") : query.root;
+	var context = query.context;
+	var localIdentName = query.localIdentName || "[hash:base64]";
+	var localIdentRegExp = query.localIdentRegExp;
+	var forceMinimize = query.minimize;
+	var minimize = typeof forceMinimize !== "undefined" ? !!forceMinimize : options.minimize;
+
+	var customGetLocalIdent = query.getLocalIdent || getLocalIdent;
+
+	var parserOptions = {
+		root: root,
+		mode: options.mode,
+		url: query.url !== false,
+		import: query.import !== false,
+		resolve: options.resolve
+	};
+
+	var pipeline = postcss([
+		modulesValues,
+		localByDefault({
+			mode: options.mode,
+			rewriteUrl: function(global, url) {
+				if(parserOptions.url){
+                    url = url.trim();
+
+					if(!url.replace(/\s/g, '').length || !loaderUtils.isUrlRequest(url, root)) {
+						return url;
+					}
+					if(global) {
+						return loaderUtils.urlToRequest(url, root);
+					}
+				}
+				return url;
+			}
+		}),
+		extractImports(),
+		modulesScope({
+			generateScopedName: function generateScopedName (exportName) {
+				return customGetLocalIdent(options.loaderContext, localIdentName, exportName, {
+					regExp: localIdentRegExp,
+					hashPrefix: query.hashPrefix || "",
+					context: context
+				});
+			}
+		}),
+		parserPlugin(parserOptions)
+	]);
+
+	if(minimize) {
+		var cssnano = require("cssnano");
+		var minimizeOptions = assign({}, query.minimize);
+		["zindex", "normalizeUrl", "discardUnused", "mergeIdents", "reduceIdents", "autoprefixer"].forEach(function(name) {
+			if(typeof minimizeOptions[name] === "undefined")
+				minimizeOptions[name] = false;
+		});
+		pipeline.use(cssnano(minimizeOptions));
+	}
+
+	pipeline.process(inputSource, {
+		// we need a prefix to avoid path rewriting of PostCSS
+		from: "/css-loader!" + options.from,
+		to: options.to,
+		map: options.sourceMap ? {
+			prev: inputMap,
+			sourcesContent: true,
+			inline: false,
+			annotation: false
+		} : null
+	}).then(function(result) {
+		callback(null, {
+			source: result.css,
+			map: result.map && result.map.toJSON(),
+			exports: parserOptions.exports,
+			importItems: parserOptions.importItems,
+			importItemRegExpG: /___CSS_LOADER_IMPORT___([0-9]+)___/g,
+			importItemRegExp: /___CSS_LOADER_IMPORT___([0-9]+)___/,
+			urlItems: parserOptions.urlItems,
+			urlItemRegExpG: /___CSS_LOADER_URL___([0-9]+)___/g,
+			urlItemRegExp: /___CSS_LOADER_URL___([0-9]+)___/
+		});
+	}).catch(function(err) {
+		if (err.name === 'CssSyntaxError') {
+			var wrappedError = new CSSLoaderError(
+				'Syntax Error',
+				err.reason,
+				err.line != null && err.column != null
+					? {line: err.line, column: err.column}
+					: null,
+				err.input.source
+			);
+			callback(wrappedError);
+		} else {
+			callback(err);
+		}
+	});
+};
+
+function formatMessage(message, loc, source) {
+	var formatted = message;
+	if (loc) {
+		formatted = formatted
+			+ ' (' + loc.line + ':' + loc.column + ')';
+	}
+	if (loc && source) {
+		formatted = formatted
+			+ '\n\n' + formatCodeFrame(source, loc.line, loc.column) + '\n';
+	}
+	return formatted;
+}
+
+function CSSLoaderError(name, message, loc, source, error) {
+	Error.call(this);
+	Error.captureStackTrace(this, CSSLoaderError);
+	this.name = name;
+	this.error = error;
+	this.message = formatMessage(message, loc, source);
+	this.hideStack = true;
+}
+
+CSSLoaderError.prototype = Object.create(Error.prototype);
+CSSLoaderError.prototype.constructor = CSSLoaderError;