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381 lines
11 KiB
381 lines
11 KiB
/*
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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 fs = require("fs");
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var readFile = fs.readFile.bind(fs);
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var loadLoader = require("./loadLoader");
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function utf8BufferToString(buf) {
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var str = buf.toString("utf-8");
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if(str.charCodeAt(0) === 0xFEFF) {
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return str.substr(1);
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} else {
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return str;
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}
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}
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function splitQuery(req) {
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var i = req.indexOf("?");
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if(i < 0) return [req, ""];
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return [req.substr(0, i), req.substr(i)];
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}
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function dirname(path) {
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if(path === "/") return "/";
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var i = path.lastIndexOf("/");
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var j = path.lastIndexOf("\\");
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var i2 = path.indexOf("/");
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var j2 = path.indexOf("\\");
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var idx = i > j ? i : j;
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var idx2 = i > j ? i2 : j2;
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if(idx < 0) return path;
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if(idx === idx2) return path.substr(0, idx + 1);
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return path.substr(0, idx);
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}
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function createLoaderObject(loader) {
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var obj = {
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path: null,
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query: null,
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options: null,
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ident: null,
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normal: null,
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pitch: null,
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raw: null,
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data: null,
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pitchExecuted: false,
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normalExecuted: false
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};
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Object.defineProperty(obj, "request", {
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enumerable: true,
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get: function() {
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return obj.path + obj.query;
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},
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set: function(value) {
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if(typeof value === "string") {
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var splittedRequest = splitQuery(value);
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obj.path = splittedRequest[0];
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obj.query = splittedRequest[1];
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obj.options = undefined;
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obj.ident = undefined;
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} else {
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if(!value.loader)
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throw new Error("request should be a string or object with loader and object (" + JSON.stringify(value) + ")");
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obj.path = value.loader;
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obj.options = value.options;
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obj.ident = value.ident;
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if(obj.options === null)
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obj.query = "";
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else if(obj.options === undefined)
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obj.query = "";
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else if(typeof obj.options === "string")
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obj.query = "?" + obj.options;
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else if(obj.ident)
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obj.query = "??" + obj.ident;
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else if(typeof obj.options === "object" && obj.options.ident)
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obj.query = "??" + obj.options.ident;
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else
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obj.query = "?" + JSON.stringify(obj.options);
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}
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}
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});
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obj.request = loader;
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if(Object.preventExtensions) {
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Object.preventExtensions(obj);
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}
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return obj;
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}
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function runSyncOrAsync(fn, context, args, callback) {
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var isSync = true;
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var isDone = false;
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var isError = false; // internal error
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var reportedError = false;
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context.async = function async() {
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if(isDone) {
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if(reportedError) return; // ignore
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throw new Error("async(): The callback was already called.");
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}
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isSync = false;
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return innerCallback;
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};
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var innerCallback = context.callback = function() {
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if(isDone) {
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if(reportedError) return; // ignore
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throw new Error("callback(): The callback was already called.");
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}
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isDone = true;
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isSync = false;
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try {
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callback.apply(null, arguments);
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} catch(e) {
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isError = true;
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throw e;
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}
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};
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try {
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var result = (function LOADER_EXECUTION() {
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return fn.apply(context, args);
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}());
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if(isSync) {
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isDone = true;
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if(result === undefined)
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return callback();
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if(result && typeof result === "object" && typeof result.then === "function") {
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return result.then(function(r) {
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callback(null, r);
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}, callback);
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}
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return callback(null, result);
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}
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} catch(e) {
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if(isError) throw e;
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if(isDone) {
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// loader is already "done", so we cannot use the callback function
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// for better debugging we print the error on the console
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if(typeof e === "object" && e.stack) console.error(e.stack);
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else console.error(e);
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return;
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}
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isDone = true;
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reportedError = true;
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callback(e);
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}
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}
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function convertArgs(args, raw) {
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if(!raw && Buffer.isBuffer(args[0]))
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args[0] = utf8BufferToString(args[0]);
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else if(raw && typeof args[0] === "string")
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args[0] = new Buffer(args[0], "utf-8"); // eslint-disable-line
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}
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function iteratePitchingLoaders(options, loaderContext, callback) {
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// abort after last loader
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if(loaderContext.loaderIndex >= loaderContext.loaders.length)
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return processResource(options, loaderContext, callback);
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var currentLoaderObject = loaderContext.loaders[loaderContext.loaderIndex];
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// iterate
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if(currentLoaderObject.pitchExecuted) {
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loaderContext.loaderIndex++;
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return iteratePitchingLoaders(options, loaderContext, callback);
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}
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// load loader module
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loadLoader(currentLoaderObject, function(err) {
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if(err) {
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loaderContext.cacheable(false);
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return callback(err);
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}
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var fn = currentLoaderObject.pitch;
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currentLoaderObject.pitchExecuted = true;
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if(!fn) return iteratePitchingLoaders(options, loaderContext, callback);
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runSyncOrAsync(
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fn,
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loaderContext, [loaderContext.remainingRequest, loaderContext.previousRequest, currentLoaderObject.data = {}],
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function(err) {
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if(err) return callback(err);
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var args = Array.prototype.slice.call(arguments, 1);
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if(args.length > 0) {
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loaderContext.loaderIndex--;
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iterateNormalLoaders(options, loaderContext, args, callback);
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} else {
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iteratePitchingLoaders(options, loaderContext, callback);
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}
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}
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);
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});
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}
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function processResource(options, loaderContext, callback) {
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// set loader index to last loader
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loaderContext.loaderIndex = loaderContext.loaders.length - 1;
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var resourcePath = loaderContext.resourcePath;
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if(resourcePath) {
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loaderContext.addDependency(resourcePath);
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options.readResource(resourcePath, function(err, buffer) {
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if(err) return callback(err);
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options.resourceBuffer = buffer;
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iterateNormalLoaders(options, loaderContext, [buffer], callback);
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});
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} else {
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iterateNormalLoaders(options, loaderContext, [null], callback);
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}
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}
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function iterateNormalLoaders(options, loaderContext, args, callback) {
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if(loaderContext.loaderIndex < 0)
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return callback(null, args);
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var currentLoaderObject = loaderContext.loaders[loaderContext.loaderIndex];
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// iterate
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if(currentLoaderObject.normalExecuted) {
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loaderContext.loaderIndex--;
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return iterateNormalLoaders(options, loaderContext, args, callback);
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}
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var fn = currentLoaderObject.normal;
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currentLoaderObject.normalExecuted = true;
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if(!fn) {
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return iterateNormalLoaders(options, loaderContext, args, callback);
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}
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convertArgs(args, currentLoaderObject.raw);
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runSyncOrAsync(fn, loaderContext, args, function(err) {
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if(err) return callback(err);
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var args = Array.prototype.slice.call(arguments, 1);
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iterateNormalLoaders(options, loaderContext, args, callback);
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});
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}
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exports.getContext = function getContext(resource) {
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var splitted = splitQuery(resource);
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return dirname(splitted[0]);
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};
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exports.runLoaders = function runLoaders(options, callback) {
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// read options
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var resource = options.resource || "";
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var loaders = options.loaders || [];
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var loaderContext = options.context || {};
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var readResource = options.readResource || readFile;
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//
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var splittedResource = resource && splitQuery(resource);
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var resourcePath = splittedResource ? splittedResource[0] : undefined;
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var resourceQuery = splittedResource ? splittedResource[1] : undefined;
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var contextDirectory = resourcePath ? dirname(resourcePath) : null;
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// execution state
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var requestCacheable = true;
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var fileDependencies = [];
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var contextDependencies = [];
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// prepare loader objects
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loaders = loaders.map(createLoaderObject);
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loaderContext.context = contextDirectory;
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loaderContext.loaderIndex = 0;
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loaderContext.loaders = loaders;
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loaderContext.resourcePath = resourcePath;
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loaderContext.resourceQuery = resourceQuery;
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loaderContext.async = null;
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loaderContext.callback = null;
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loaderContext.cacheable = function cacheable(flag) {
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if(flag === false) {
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requestCacheable = false;
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}
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};
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loaderContext.dependency = loaderContext.addDependency = function addDependency(file) {
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fileDependencies.push(file);
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};
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loaderContext.addContextDependency = function addContextDependency(context) {
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contextDependencies.push(context);
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};
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loaderContext.getDependencies = function getDependencies() {
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return fileDependencies.slice();
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};
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loaderContext.getContextDependencies = function getContextDependencies() {
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return contextDependencies.slice();
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};
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loaderContext.clearDependencies = function clearDependencies() {
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fileDependencies.length = 0;
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contextDependencies.length = 0;
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requestCacheable = true;
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};
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Object.defineProperty(loaderContext, "resource", {
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enumerable: true,
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get: function() {
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if(loaderContext.resourcePath === undefined)
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return undefined;
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return loaderContext.resourcePath + loaderContext.resourceQuery;
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},
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set: function(value) {
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var splittedResource = value && splitQuery(value);
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loaderContext.resourcePath = splittedResource ? splittedResource[0] : undefined;
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loaderContext.resourceQuery = splittedResource ? splittedResource[1] : undefined;
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}
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});
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Object.defineProperty(loaderContext, "request", {
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enumerable: true,
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get: function() {
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return loaderContext.loaders.map(function(o) {
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return o.request;
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}).concat(loaderContext.resource || "").join("!");
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}
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});
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Object.defineProperty(loaderContext, "remainingRequest", {
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enumerable: true,
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get: function() {
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if(loaderContext.loaderIndex >= loaderContext.loaders.length - 1 && !loaderContext.resource)
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return "";
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return loaderContext.loaders.slice(loaderContext.loaderIndex + 1).map(function(o) {
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return o.request;
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}).concat(loaderContext.resource || "").join("!");
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}
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});
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Object.defineProperty(loaderContext, "currentRequest", {
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enumerable: true,
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get: function() {
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return loaderContext.loaders.slice(loaderContext.loaderIndex).map(function(o) {
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return o.request;
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}).concat(loaderContext.resource || "").join("!");
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}
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});
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Object.defineProperty(loaderContext, "previousRequest", {
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enumerable: true,
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get: function() {
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return loaderContext.loaders.slice(0, loaderContext.loaderIndex).map(function(o) {
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return o.request;
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}).join("!");
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}
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});
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Object.defineProperty(loaderContext, "query", {
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enumerable: true,
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get: function() {
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var entry = loaderContext.loaders[loaderContext.loaderIndex];
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return entry.options && typeof entry.options === "object" ? entry.options : entry.query;
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}
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});
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Object.defineProperty(loaderContext, "data", {
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enumerable: true,
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get: function() {
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return loaderContext.loaders[loaderContext.loaderIndex].data;
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}
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});
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// finish loader context
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if(Object.preventExtensions) {
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Object.preventExtensions(loaderContext);
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}
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var processOptions = {
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resourceBuffer: null,
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readResource: readResource
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};
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iteratePitchingLoaders(processOptions, loaderContext, function(err, result) {
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if(err) {
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return callback(err, {
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cacheable: requestCacheable,
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fileDependencies: fileDependencies,
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contextDependencies: contextDependencies
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});
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}
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callback(null, {
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result: result,
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resourceBuffer: processOptions.resourceBuffer,
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cacheable: requestCacheable,
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fileDependencies: fileDependencies,
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contextDependencies: contextDependencies
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});
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});
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};
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