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Diffstat (limited to 'node_modules/loader-runner/lib/LoaderRunner.js')
| -rw-r--r-- | node_modules/loader-runner/lib/LoaderRunner.js | 416 |
1 files changed, 416 insertions, 0 deletions
diff --git a/node_modules/loader-runner/lib/LoaderRunner.js b/node_modules/loader-runner/lib/LoaderRunner.js new file mode 100644 index 00000000..5909261c --- /dev/null +++ b/node_modules/loader-runner/lib/LoaderRunner.js @@ -0,0 +1,416 @@ +/* + MIT License http://www.opensource.org/licenses/mit-license.php + Author Tobias Koppers @sokra +*/ +var fs = require("fs"); +var readFile = fs.readFile.bind(fs); +var loadLoader = require("./loadLoader"); + +function utf8BufferToString(buf) { + var str = buf.toString("utf-8"); + if(str.charCodeAt(0) === 0xFEFF) { + return str.substr(1); + } else { + return str; + } +} + +const PATH_QUERY_FRAGMENT_REGEXP = /^((?:\0.|[^?#\0])*)(\?(?:\0.|[^#\0])*)?(#.*)?$/; + +/** + * @param {string} str the path with query and fragment + * @returns {{ path: string, query: string, fragment: string }} parsed parts + */ +function parsePathQueryFragment(str) { + var match = PATH_QUERY_FRAGMENT_REGEXP.exec(str); + return { + path: match[1].replace(/\0(.)/g, "$1"), + query: match[2] ? match[2].replace(/\0(.)/g, "$1") : "", + fragment: match[3] || "" + }; +} + +function dirname(path) { + if(path === "/") return "/"; + var i = path.lastIndexOf("/"); + var j = path.lastIndexOf("\\"); + var i2 = path.indexOf("/"); + var j2 = path.indexOf("\\"); + var idx = i > j ? i : j; + var idx2 = i > j ? i2 : j2; + if(idx < 0) return path; + if(idx === idx2) return path.substr(0, idx + 1); + return path.substr(0, idx); +} + +function createLoaderObject(loader) { + var obj = { + path: null, + query: null, + fragment: null, + options: null, + ident: null, + normal: null, + pitch: null, + raw: null, + data: null, + pitchExecuted: false, + normalExecuted: false + }; + Object.defineProperty(obj, "request", { + enumerable: true, + get: function() { + return obj.path.replace(/#/g, "\0#") + obj.query.replace(/#/g, "\0#") + obj.fragment; + }, + set: function(value) { + if(typeof value === "string") { + var splittedRequest = parsePathQueryFragment(value); + obj.path = splittedRequest.path; + obj.query = splittedRequest.query; + obj.fragment = splittedRequest.fragment; + obj.options = undefined; + obj.ident = undefined; + } else { + if(!value.loader) + throw new Error("request should be a string or object with loader and options (" + JSON.stringify(value) + ")"); + obj.path = value.loader; + obj.fragment = value.fragment || ""; + obj.type = value.type; + obj.options = value.options; + obj.ident = value.ident; + if(obj.options === null) + obj.query = ""; + else if(obj.options === undefined) + obj.query = ""; + else if(typeof obj.options === "string") + obj.query = "?" + obj.options; + else if(obj.ident) + obj.query = "??" + obj.ident; + else if(typeof obj.options === "object" && obj.options.ident) + obj.query = "??" + obj.options.ident; + else + obj.query = "?" + JSON.stringify(obj.options); + } + } + }); + obj.request = loader; + if(Object.preventExtensions) { + Object.preventExtensions(obj); + } + return obj; +} + +function runSyncOrAsync(fn, context, args, callback) { + var isSync = true; + var isDone = false; + var isError = false; // internal error + var reportedError = false; + context.async = function async() { + if(isDone) { + if(reportedError) return; // ignore + throw new Error("async(): The callback was already called."); + } + isSync = false; + return innerCallback; + }; + var innerCallback = context.callback = function() { + if(isDone) { + if(reportedError) return; // ignore + throw new Error("callback(): The callback was already called."); + } + isDone = true; + isSync = false; + try { + callback.apply(null, arguments); + } catch(e) { + isError = true; + throw e; + } + }; + try { + var result = (function LOADER_EXECUTION() { + return fn.apply(context, args); + }()); + if(isSync) { + isDone = true; + if(result === undefined) + return callback(); + if(result && typeof result === "object" && typeof result.then === "function") { + return result.then(function(r) { + callback(null, r); + }, callback); + } + return callback(null, result); + } + } catch(e) { + if(isError) throw e; + if(isDone) { + // loader is already "done", so we cannot use the callback function + // for better debugging we print the error on the console + if(typeof e === "object" && e.stack) console.error(e.stack); + else console.error(e); + return; + } + isDone = true; + reportedError = true; + callback(e); + } + +} + +function convertArgs(args, raw) { + if(!raw && Buffer.isBuffer(args[0])) + args[0] = utf8BufferToString(args[0]); + else if(raw && typeof args[0] === "string") + args[0] = Buffer.from(args[0], "utf-8"); +} + +function iteratePitchingLoaders(options, loaderContext, callback) { + // abort after last loader + if(loaderContext.loaderIndex >= loaderContext.loaders.length) + return processResource(options, loaderContext, callback); + + var currentLoaderObject = loaderContext.loaders[loaderContext.loaderIndex]; + + // iterate + if(currentLoaderObject.pitchExecuted) { + loaderContext.loaderIndex++; + return iteratePitchingLoaders(options, loaderContext, callback); + } + + // load loader module + loadLoader(currentLoaderObject, function(err) { + if(err) { + loaderContext.cacheable(false); + return callback(err); + } + var fn = currentLoaderObject.pitch; + currentLoaderObject.pitchExecuted = true; + if(!fn) return iteratePitchingLoaders(options, loaderContext, callback); + + runSyncOrAsync( + fn, + loaderContext, [loaderContext.remainingRequest, loaderContext.previousRequest, currentLoaderObject.data = {}], + function(err) { + if(err) return callback(err); + var args = Array.prototype.slice.call(arguments, 1); + // Determine whether to continue the pitching process based on + // argument values (as opposed to argument presence) in order + // to support synchronous and asynchronous usages. + var hasArg = args.some(function(value) { + return value !== undefined; + }); + if(hasArg) { + loaderContext.loaderIndex--; + iterateNormalLoaders(options, loaderContext, args, callback); + } else { + iteratePitchingLoaders(options, loaderContext, callback); + } + } + ); + }); +} + +function processResource(options, loaderContext, callback) { + // set loader index to last loader + loaderContext.loaderIndex = loaderContext.loaders.length - 1; + + var resourcePath = loaderContext.resourcePath; + if(resourcePath) { + options.processResource(loaderContext, resourcePath, function(err) { + if(err) return callback(err); + var args = Array.prototype.slice.call(arguments, 1); + options.resourceBuffer = args[0]; + iterateNormalLoaders(options, loaderContext, args, callback); + }); + } else { + iterateNormalLoaders(options, loaderContext, [null], callback); + } +} + +function iterateNormalLoaders(options, loaderContext, args, callback) { + if(loaderContext.loaderIndex < 0) + return callback(null, args); + + var currentLoaderObject = loaderContext.loaders[loaderContext.loaderIndex]; + + // iterate + if(currentLoaderObject.normalExecuted) { + loaderContext.loaderIndex--; + return iterateNormalLoaders(options, loaderContext, args, callback); + } + + var fn = currentLoaderObject.normal; + currentLoaderObject.normalExecuted = true; + if(!fn) { + return iterateNormalLoaders(options, loaderContext, args, callback); + } + + convertArgs(args, currentLoaderObject.raw); + + runSyncOrAsync(fn, loaderContext, args, function(err) { + if(err) return callback(err); + + var args = Array.prototype.slice.call(arguments, 1); + iterateNormalLoaders(options, loaderContext, args, callback); + }); +} + +exports.getContext = function getContext(resource) { + var path = parsePathQueryFragment(resource).path; + return dirname(path); +}; + +exports.runLoaders = function runLoaders(options, callback) { + // read options + var resource = options.resource || ""; + var loaders = options.loaders || []; + var loaderContext = options.context || {}; + var processResource = options.processResource || ((readResource, context, resource, callback) => { + context.addDependency(resource); + readResource(resource, callback); + }).bind(null, options.readResource || readFile); + + // + var splittedResource = resource && parsePathQueryFragment(resource); + var resourcePath = splittedResource ? splittedResource.path : undefined; + var resourceQuery = splittedResource ? splittedResource.query : undefined; + var resourceFragment = splittedResource ? splittedResource.fragment : undefined; + var contextDirectory = resourcePath ? dirname(resourcePath) : null; + + // execution state + var requestCacheable = true; + var fileDependencies = []; + var contextDependencies = []; + var missingDependencies = []; + + // prepare loader objects + loaders = loaders.map(createLoaderObject); + + loaderContext.context = contextDirectory; + loaderContext.loaderIndex = 0; + loaderContext.loaders = loaders; + loaderContext.resourcePath = resourcePath; + loaderContext.resourceQuery = resourceQuery; + loaderContext.resourceFragment = resourceFragment; + loaderContext.async = null; + loaderContext.callback = null; + loaderContext.cacheable = function cacheable(flag) { + if(flag === false) { + requestCacheable = false; + } + }; + loaderContext.dependency = loaderContext.addDependency = function addDependency(file) { + fileDependencies.push(file); + }; + loaderContext.addContextDependency = function addContextDependency(context) { + contextDependencies.push(context); + }; + loaderContext.addMissingDependency = function addMissingDependency(context) { + missingDependencies.push(context); + }; + loaderContext.getDependencies = function getDependencies() { + return fileDependencies.slice(); + }; + loaderContext.getContextDependencies = function getContextDependencies() { + return contextDependencies.slice(); + }; + loaderContext.getMissingDependencies = function getMissingDependencies() { + return missingDependencies.slice(); + }; + loaderContext.clearDependencies = function clearDependencies() { + fileDependencies.length = 0; + contextDependencies.length = 0; + missingDependencies.length = 0; + requestCacheable = true; + }; + Object.defineProperty(loaderContext, "resource", { + enumerable: true, + get: function() { + if(loaderContext.resourcePath === undefined) + return undefined; + return loaderContext.resourcePath.replace(/#/g, "\0#") + loaderContext.resourceQuery.replace(/#/g, "\0#") + loaderContext.resourceFragment; + }, + set: function(value) { + var splittedResource = value && parsePathQueryFragment(value); + loaderContext.resourcePath = splittedResource ? splittedResource.path : undefined; + loaderContext.resourceQuery = splittedResource ? splittedResource.query : undefined; + loaderContext.resourceFragment = splittedResource ? splittedResource.fragment : undefined; + } + }); + Object.defineProperty(loaderContext, "request", { + enumerable: true, + get: function() { + return loaderContext.loaders.map(function(o) { + return o.request; + }).concat(loaderContext.resource || "").join("!"); + } + }); + Object.defineProperty(loaderContext, "remainingRequest", { + enumerable: true, + get: function() { + if(loaderContext.loaderIndex >= loaderContext.loaders.length - 1 && !loaderContext.resource) + return ""; + return loaderContext.loaders.slice(loaderContext.loaderIndex + 1).map(function(o) { + return o.request; + }).concat(loaderContext.resource || "").join("!"); + } + }); + Object.defineProperty(loaderContext, "currentRequest", { + enumerable: true, + get: function() { + return loaderContext.loaders.slice(loaderContext.loaderIndex).map(function(o) { + return o.request; + }).concat(loaderContext.resource || "").join("!"); + } + }); + Object.defineProperty(loaderContext, "previousRequest", { + enumerable: true, + get: function() { + return loaderContext.loaders.slice(0, loaderContext.loaderIndex).map(function(o) { + return o.request; + }).join("!"); + } + }); + Object.defineProperty(loaderContext, "query", { + enumerable: true, + get: function() { + var entry = loaderContext.loaders[loaderContext.loaderIndex]; + return entry.options && typeof entry.options === "object" ? entry.options : entry.query; + } + }); + Object.defineProperty(loaderContext, "data", { + enumerable: true, + get: function() { + return loaderContext.loaders[loaderContext.loaderIndex].data; + } + }); + + // finish loader context + if(Object.preventExtensions) { + Object.preventExtensions(loaderContext); + } + + var processOptions = { + resourceBuffer: null, + processResource: processResource + }; + iteratePitchingLoaders(processOptions, loaderContext, function(err, result) { + if(err) { + return callback(err, { + cacheable: requestCacheable, + fileDependencies: fileDependencies, + contextDependencies: contextDependencies, + missingDependencies: missingDependencies + }); + } + callback(null, { + result: result, + resourceBuffer: processOptions.resourceBuffer, + cacheable: requestCacheable, + fileDependencies: fileDependencies, + contextDependencies: contextDependencies, + missingDependencies: missingDependencies + }); + }); +}; |