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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const asyncLib = require("neo-async");
const path = require("path");
const {
Tapable,
AsyncSeriesWaterfallHook,
SyncWaterfallHook
} = require("tapable");
const ContextModule = require("./ContextModule");
const ContextElementDependency = require("./dependencies/ContextElementDependency");
/** @typedef {import("./Module")} Module */
const EMPTY_RESOLVE_OPTIONS = {};
module.exports = class ContextModuleFactory extends Tapable {
constructor(resolverFactory) {
super();
this.hooks = {
/** @type {AsyncSeriesWaterfallHook<TODO>} */
beforeResolve: new AsyncSeriesWaterfallHook(["data"]),
/** @type {AsyncSeriesWaterfallHook<TODO>} */
afterResolve: new AsyncSeriesWaterfallHook(["data"]),
/** @type {SyncWaterfallHook<string[]>} */
contextModuleFiles: new SyncWaterfallHook(["files"]),
/** @type {SyncWaterfallHook<TODO[]>} */
alternatives: new AsyncSeriesWaterfallHook(["modules"])
};
this._pluginCompat.tap("ContextModuleFactory", options => {
switch (options.name) {
case "before-resolve":
case "after-resolve":
case "alternatives":
options.async = true;
break;
}
});
this.resolverFactory = resolverFactory;
}
create(data, callback) {
const context = data.context;
const dependencies = data.dependencies;
const resolveOptions = data.resolveOptions;
const dependency = dependencies[0];
this.hooks.beforeResolve.callAsync(
Object.assign(
{
context: context,
dependencies: dependencies,
resolveOptions
},
dependency.options
),
(err, beforeResolveResult) => {
if (err) return callback(err);
// Ignored
if (!beforeResolveResult) return callback();
const context = beforeResolveResult.context;
const request = beforeResolveResult.request;
const resolveOptions = beforeResolveResult.resolveOptions;
let loaders,
resource,
loadersPrefix = "";
const idx = request.lastIndexOf("!");
if (idx >= 0) {
let loadersRequest = request.substr(0, idx + 1);
let i;
for (
i = 0;
i < loadersRequest.length && loadersRequest[i] === "!";
i++
) {
loadersPrefix += "!";
}
loadersRequest = loadersRequest
.substr(i)
.replace(/!+$/, "")
.replace(/!!+/g, "!");
if (loadersRequest === "") {
loaders = [];
} else {
loaders = loadersRequest.split("!");
}
resource = request.substr(idx + 1);
} else {
loaders = [];
resource = request;
}
const contextResolver = this.resolverFactory.get(
"context",
resolveOptions || EMPTY_RESOLVE_OPTIONS
);
const loaderResolver = this.resolverFactory.get(
"loader",
EMPTY_RESOLVE_OPTIONS
);
asyncLib.parallel(
[
callback => {
contextResolver.resolve(
{},
context,
resource,
{},
(err, result) => {
if (err) return callback(err);
callback(null, result);
}
);
},
callback => {
asyncLib.map(
loaders,
(loader, callback) => {
loaderResolver.resolve(
{},
context,
loader,
{},
(err, result) => {
if (err) return callback(err);
callback(null, result);
}
);
},
callback
);
}
],
(err, result) => {
if (err) return callback(err);
this.hooks.afterResolve.callAsync(
Object.assign(
{
addon:
loadersPrefix +
result[1].join("!") +
(result[1].length > 0 ? "!" : ""),
resource: result[0],
resolveDependencies: this.resolveDependencies.bind(this)
},
beforeResolveResult
),
(err, result) => {
if (err) return callback(err);
// Ignored
if (!result) return callback();
return callback(
null,
new ContextModule(result.resolveDependencies, result)
);
}
);
}
);
}
);
}
resolveDependencies(fs, options, callback) {
const cmf = this;
let resource = options.resource;
let resourceQuery = options.resourceQuery;
let recursive = options.recursive;
let regExp = options.regExp;
let include = options.include;
let exclude = options.exclude;
if (!regExp || !resource) return callback(null, []);
const addDirectory = (directory, callback) => {
fs.readdir(directory, (err, files) => {
if (err) return callback(err);
files = cmf.hooks.contextModuleFiles.call(files);
if (!files || files.length === 0) return callback(null, []);
asyncLib.map(
files.filter(p => p.indexOf(".") !== 0),
(segment, callback) => {
const subResource = path.join(directory, segment);
if (!exclude || !subResource.match(exclude)) {
fs.stat(subResource, (err, stat) => {
if (err) {
if (err.code === "ENOENT") {
// ENOENT is ok here because the file may have been deleted between
// the readdir and stat calls.
return callback();
} else {
return callback(err);
}
}
if (stat.isDirectory()) {
if (!recursive) return callback();
addDirectory.call(this, subResource, callback);
} else if (
stat.isFile() &&
(!include || subResource.match(include))
) {
const obj = {
context: resource,
request:
"." +
subResource.substr(resource.length).replace(/\\/g, "/")
};
this.hooks.alternatives.callAsync(
[obj],
(err, alternatives) => {
if (err) return callback(err);
alternatives = alternatives
.filter(obj => regExp.test(obj.request))
.map(obj => {
const dep = new ContextElementDependency(
obj.request + resourceQuery,
obj.request
);
dep.optional = true;
return dep;
});
callback(null, alternatives);
}
);
} else {
callback();
}
});
} else {
callback();
}
},
(err, result) => {
if (err) return callback(err);
if (!result) return callback(null, []);
callback(
null,
result.filter(Boolean).reduce((a, i) => a.concat(i), [])
);
}
);
});
};
addDirectory(resource, callback);
}
};