382 lines
11 KiB
JavaScript
382 lines
11 KiB
JavaScript
|
/*
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
function splitQuery(req) {
|
||
|
|
var i = req.indexOf("?");
|
||
|
|
if(i < 0) return [req, ""];
|
||
|
|
return [req.substr(0, i), req.substr(i)];
|
||
|
|
}
|
||
|
|
|
||
|
|
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,
|
||
|
|
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 + obj.query;
|
||
|
|
},
|
||
|
|
set: function(value) {
|
||
|
|
if(typeof value === "string") {
|
||
|
|
var splittedRequest = splitQuery(value);
|
||
|
|
obj.path = splittedRequest[0];
|
||
|
|
obj.query = splittedRequest[1];
|
||
|
|
obj.options = undefined;
|
||
|
|
obj.ident = undefined;
|
||
|
|
} else {
|
||
|
|
if(!value.loader)
|
||
|
|
throw new Error("request should be a string or object with loader and object (" + JSON.stringify(value) + ")");
|
||
|
|
obj.path = value.loader;
|
||
|
|
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] = new Buffer(args[0], "utf-8"); // eslint-disable-line
|
||
|
|
}
|
||
|
|
|
||
|
|
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);
|
||
|
|
if(args.length > 0) {
|
||
|
|
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) {
|
||
|
|
loaderContext.addDependency(resourcePath);
|
||
|
|
options.readResource(resourcePath, function(err, buffer) {
|
||
|
|
if(err) return callback(err);
|
||
|
|
options.resourceBuffer = buffer;
|
||
|
|
iterateNormalLoaders(options, loaderContext, [buffer], 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 splitted = splitQuery(resource);
|
||
|
|
return dirname(splitted[0]);
|
||
|
|
};
|
||
|
|
|
||
|
|
exports.runLoaders = function runLoaders(options, callback) {
|
||
|
|
// read options
|
||
|
|
var resource = options.resource || "";
|
||
|
|
var loaders = options.loaders || [];
|
||
|
|
var loaderContext = options.context || {};
|
||
|
|
var readResource = options.readResource || readFile;
|
||
|
|
|
||
|
|
//
|
||
|
|
var splittedResource = resource && splitQuery(resource);
|
||
|
|
var resourcePath = splittedResource ? splittedResource[0] : undefined;
|
||
|
|
var resourceQuery = splittedResource ? splittedResource[1] : undefined;
|
||
|
|
var contextDirectory = resourcePath ? dirname(resourcePath) : null;
|
||
|
|
|
||
|
|
// execution state
|
||
|
|
var requestCacheable = true;
|
||
|
|
var fileDependencies = [];
|
||
|
|
var contextDependencies = [];
|
||
|
|
|
||
|
|
// prepare loader objects
|
||
|
|
loaders = loaders.map(createLoaderObject);
|
||
|
|
|
||
|
|
loaderContext.context = contextDirectory;
|
||
|
|
loaderContext.loaderIndex = 0;
|
||
|
|
loaderContext.loaders = loaders;
|
||
|
|
loaderContext.resourcePath = resourcePath;
|
||
|
|
loaderContext.resourceQuery = resourceQuery;
|
||
|
|
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.getDependencies = function getDependencies() {
|
||
|
|
return fileDependencies.slice();
|
||
|
|
};
|
||
|
|
loaderContext.getContextDependencies = function getContextDependencies() {
|
||
|
|
return contextDependencies.slice();
|
||
|
|
};
|
||
|
|
loaderContext.clearDependencies = function clearDependencies() {
|
||
|
|
fileDependencies.length = 0;
|
||
|
|
contextDependencies.length = 0;
|
||
|
|
requestCacheable = true;
|
||
|
|
};
|
||
|
|
Object.defineProperty(loaderContext, "resource", {
|
||
|
|
enumerable: true,
|
||
|
|
get: function() {
|
||
|
|
if(loaderContext.resourcePath === undefined)
|
||
|
|
return undefined;
|
||
|
|
return loaderContext.resourcePath + loaderContext.resourceQuery;
|
||
|
|
},
|
||
|
|
set: function(value) {
|
||
|
|
var splittedResource = value && splitQuery(value);
|
||
|
|
loaderContext.resourcePath = splittedResource ? splittedResource[0] : undefined;
|
||
|
|
loaderContext.resourceQuery = splittedResource ? splittedResource[1] : 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,
|
||
|
|
readResource: readResource
|
||
|
|
};
|
||
|
|
iteratePitchingLoaders(processOptions, loaderContext, function(err, result) {
|
||
|
|
if(err) {
|
||
|
|
return callback(err, {
|
||
|
|
cacheable: requestCacheable,
|
||
|
|
fileDependencies: fileDependencies,
|
||
|
|
contextDependencies: contextDependencies
|
||
|
|
});
|
||
|
|
}
|
||
|
|
callback(null, {
|
||
|
|
result: result,
|
||
|
|
resourceBuffer: processOptions.resourceBuffer,
|
||
|
|
cacheable: requestCacheable,
|
||
|
|
fileDependencies: fileDependencies,
|
||
|
|
contextDependencies: contextDependencies
|
||
|
|
});
|
||
|
|
});
|
||
|
|
};
|