mirror of https://github.com/webpack/webpack.git
91 lines
2.5 KiB
JavaScript
91 lines
2.5 KiB
JavaScript
// Polyfill for node.js
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// - adds require.ensure
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// - adds require.context
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// call it like this:
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// require = require("webpack/require-polyfill")(require.valueOf());
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// This is only required when you want to use the special require.xxx methods
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// in server-side code which should be so only in rar cases.
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module.exports = function(req) {
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if(!req.webpackPolyfill) {
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var oldReq = req;
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req = function(name) {
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if(name.indexOf("!") !== -1) {
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var items = name.split(/!/g);
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var resource = oldReq.resolve(items.pop());
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var resolved = [];
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items.forEach(function(item, index) {
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var relative = false;
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if(item.length > 2 &&
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item[0] === ".") {
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if(item[1] === "/")
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relative = true;
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else if(item.length > 3 &&
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item[1] === "." &&
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item[2] === "/")
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relative = true;
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}
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if(item.length > 3 &&
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item[1] === ":" &&
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item[2] === "\\")
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relative = true;
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var tries = [];
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if(!relative) {
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postfixes.forEach(function(postfix) {
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if(item.indexOf("/") !== -1)
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tries.push(item.replace("/", postfix+"/"));
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else
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tries.push(item + postfix);
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});
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}
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tries.push(item);
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for(var i = 0; i < tries.length; i++) {
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for(var ext = 0; ext < extensions.length; ext++) {
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try {
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var file = oldReq.resolve(tries[i] + extensions[ext]);
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} catch(e) {}
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if(file) {
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resolved.push(file);
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break;
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}
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}
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if(ext !== extensions.length)
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break;
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}
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if(i === tries.length)
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throw new Error("Cannot find loader module '"+item+"'");
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});
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resolved = resolved.reverse();
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var cacheLine = resolved.join("!") + "!" + resource;
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var cacheEntry = oldReq.cache[cacheLine];
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if(cacheEntry)
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return cacheEntry;
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var content = [require("fs").readFileSync(resource, "utf-8")];
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resolved.forEach(function(loader) {
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content = oldReq(loader)(content, {
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request: cacheLine,
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filename: resource
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});
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});
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return content;
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} else
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return oldReq(name);
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};
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req.__proto__ = oldReq;
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req.webpackPolyfill = true;
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}
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if(!req.ensure) {
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req.ensure = function(array, callback) {
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callback(req);
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};
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}
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if(!req.context) {
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req.context = function(contextName) {
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return function(name) {
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return req(contextName + "/" + name);
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}
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}
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}
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return req;
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}
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var extensions = [".webpack-loader.js", ".loader.js", ".js", ""];
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var postfixes = ["-webpack-loader", "-loader", ""] |