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processCss.js
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processCss.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
var Tokenizer = require("css-selector-tokenizer");
var postcss = require("postcss");
var loaderUtils = require("loader-utils");
var getLocalIdent = require("./getLocalIdent");
var localByDefault = require("postcss-modules-local-by-default");
var extractImports = require("postcss-modules-extract-imports");
var modulesScope = require("postcss-modules-scope");
var cssnano = require("cssnano");
var parserPlugin = postcss.plugin("css-loader-parser", function(options) {
return function(css) {
var imports = {};
var exports = {};
var importItems = [];
var urlItems = [];
function replaceImportsInString(str) {
var tokens = str.split(/(\S+)/);
tokens = tokens.map(function(token) {
var importIndex = imports["$" + token];
if(typeof importIndex === "number") {
return "___CSS_LOADER_IMPORT___" + importIndex + "___";
}
return token;
});
return tokens.join("");
}
css.eachAtRule("import", function(rule) {
var values = Tokenizer.parseValues(rule.params);
var url = values.nodes[0].nodes[0];
if(url.type === "url") {
url = url.url;
} else if(url.type === "string") {
url = url.value;
} else throw rule.error("Unexpected format" + rule.params);
values.nodes[0].nodes.shift();
var mediaQuery = Tokenizer.stringifyValues(values);
if(loaderUtils.isUrlRequest(url, options.root) && options.mode === "global") {
url = loaderUtils.urlToRequest(url, options.root);
}
importItems.push({
url: url,
mediaQuery: mediaQuery
});
rule.removeSelf();
});
css.eachRule(function(rule) {
if(rule.selector === ":export") {
rule.eachDecl(function(decl) {
exports[decl.prop] = decl.value;
});
rule.removeSelf();
} else if(/^:import\(.+\)$/.test(rule.selector)) {
var match = /^:import\((.+)\)$/.exec(rule.selector);
var url = loaderUtils.parseString(match[1]);
rule.eachDecl(function(decl) {
imports["$" + decl.prop] = importItems.length;
importItems.push({
url: url,
export: decl.value
});
});
rule.removeSelf();
}
});
Object.keys(exports).forEach(function(exportName) {
exports[exportName] = replaceImportsInString(exports[exportName]);
});
css.eachDecl(function(decl) {
var values = Tokenizer.parseValues(decl.value);
values.nodes.forEach(function(value) {
value.nodes.forEach(function(item) {
switch(item.type) {
case "item":
var importIndex = imports["$" + item.name];
if(typeof importIndex === "number") {
item.name = "___CSS_LOADER_IMPORT___" + importIndex + "___";
}
break;
case "url":
if(!/^#/.test(item.url) && loaderUtils.isUrlRequest(item.url, options.root)) {
item.stringType = "";
delete item.innerSpacingBefore;
delete item.innerSpacingAfter;
var url = item.url;
item.url = "___CSS_LOADER_URL___" + urlItems.length + "___";
urlItems.push({
url: url
});
}
break;
}
});
});
decl.value = Tokenizer.stringifyValues(values);
});
css.eachAtRule(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) {
var query = options.query;
var root = query.root;
var localIdentName = query.localIdentName || "[hash:base64]";
var localIdentRegExp = query.localIdentRegExp;
var forceMinimize = query.minimize;
var minimize = typeof forceMinimize !== "undefined" ? !!forceMinimize : options.minimize;
var parserOptions = {
root: root,
mode: options.mode
};
var pipeline = postcss([
localByDefault({
mode: options.mode,
rewriteUrl: function(global, url) {
if(!loaderUtils.isUrlRequest(url, root)) {
return url;
}
if(global) {
return loaderUtils.urlToRequest(url, root);
}
return url;
}
}),
extractImports({
createImportedName: function(importName) {
return "___" + importName;
}
}),
modulesScope({
generateScopedName: function(exportName) {
return getLocalIdent(options.loaderContext, localIdentName, exportName, {
regExp: localIdentRegExp
});
}
}),
parserPlugin(parserOptions)
]);
if(minimize) {
var minimizeOptions = Object.create(query);
["zindex", "normalizeUrl", "discardUnused", "mergeIdents", "reduceIdents"].forEach(function(name) {
if(typeof minimizeOptions[name] === "undefined")
minimizeOptions[name] = false;
});
pipeline.use(cssnano(minimizeOptions));
}
var result = pipeline.process(inputSource, {
from: options.from,
to: options.to,
map: {
prev: inputMap,
sourcesContent: true,
inline: false,
annotation: false
}
});
return {
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]+)___/
};
};