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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const util = require("util");
const Tapable = require("tapable/lib/Tapable");
const SyncHook = require("tapable/lib/SyncHook");
const AsyncSeriesBailHook = require("tapable/lib/AsyncSeriesBailHook");
const AsyncSeriesHook = require("tapable/lib/AsyncSeriesHook");
const createInnerContext = require("./createInnerContext");
const REGEXP_NOT_MODULE = /^\.$|^\.[\\/]|^\.\.$|^\.\.[\\/]|^\/|^[A-Z]:[\\/]/i;
const REGEXP_DIRECTORY = /[\\/]$/i;
const memoryFsJoin = require("memory-fs/lib/join");
const memoizedJoin = new Map();
const memoryFsNormalize = require("memory-fs/lib/normalize");
function withName(name, hook) {
hook.name = name;
return hook;
}
function toCamelCase(str) {
return str.replace(/-([a-z])/g, str => str.substr(1).toUpperCase());
}
const deprecatedPushToMissing = util.deprecate((set, item) => {
set.add(item);
}, "Resolver: 'missing' is now a Set. Use add instead of push.");
const deprecatedResolveContextInCallback = util.deprecate(x => {
return x;
}, "Resolver: The callback argument was splitted into resolveContext and callback.");
const deprecatedHookAsString = util.deprecate(x => {
return x;
}, "Resolver#doResolve: The type arguments (string) is now a hook argument (Hook). Pass a reference to the hook instead.");
class Resolver extends Tapable {
constructor(fileSystem) {
super();
this.fileSystem = fileSystem;
this.hooks = {
resolveStep: withName("resolveStep", new SyncHook(["hook", "request"])),
noResolve: withName("noResolve", new SyncHook(["request", "error"])),
resolve: withName(
"resolve",
new AsyncSeriesBailHook(["request", "resolveContext"])
),
result: new AsyncSeriesHook(["result", "resolveContext"])
};
this._pluginCompat.tap("Resolver: before/after", options => {
if (/^before-/.test(options.name)) {
options.name = options.name.substr(7);
options.stage = -10;
} else if (/^after-/.test(options.name)) {
options.name = options.name.substr(6);
options.stage = 10;
}
});
this._pluginCompat.tap("Resolver: step hooks", options => {
const name = options.name;
const stepHook = !/^resolve(-s|S)tep$|^no(-r|R)esolve$/.test(name);
if (stepHook) {
options.async = true;
this.ensureHook(name);
const fn = options.fn;
options.fn = (request, resolverContext, callback) => {
const innerCallback = (err, result) => {
if (err) return callback(err);
if (result !== undefined) return callback(null, result);
callback();
};
for (const key in resolverContext) {
innerCallback[key] = resolverContext[key];
}
fn.call(this, request, innerCallback);
};
}
});
}
ensureHook(name) {
if (typeof name !== "string") return name;
name = toCamelCase(name);
if (/^before/.test(name)) {
return this.ensureHook(
name[6].toLowerCase() + name.substr(7)
).withOptions({
stage: -10
});
}
if (/^after/.test(name)) {
return this.ensureHook(
name[5].toLowerCase() + name.substr(6)
).withOptions({
stage: 10
});
}
const hook = this.hooks[name];
if (!hook) {
return (this.hooks[name] = withName(
name,
new AsyncSeriesBailHook(["request", "resolveContext"])
));
}
return hook;
}
getHook(name) {
if (typeof name !== "string") return name;
name = toCamelCase(name);
if (/^before/.test(name)) {
return this.getHook(name[6].toLowerCase() + name.substr(7)).withOptions({
stage: -10
});
}
if (/^after/.test(name)) {
return this.getHook(name[5].toLowerCase() + name.substr(6)).withOptions({
stage: 10
});
}
const hook = this.hooks[name];
if (!hook) {
throw new Error(`Hook ${name} doesn't exist`);
}
return hook;
}
resolveSync(context, path, request) {
let err,
result,
sync = false;
this.resolve(context, path, request, {}, (e, r) => {
err = e;
result = r;
sync = true;
});
if (!sync)
throw new Error(
"Cannot 'resolveSync' because the fileSystem is not sync. Use 'resolve'!"
);
if (err) throw err;
return result;
}
resolve(context, path, request, resolveContext, callback) {
// TODO remove in enhanced-resolve 5
// For backward compatiblity START
if (typeof callback !== "function") {
callback = deprecatedResolveContextInCallback(resolveContext);
// resolveContext is a function containing additional properties
// It's now used for resolveContext and callback
}
// END
const obj = {
context: context,
path: path,
request: request
};
const message = "resolve '" + request + "' in '" + path + "'";
// Try to resolve assuming there is no error
// We don't log stuff in this case
return this.doResolve(
this.hooks.resolve,
obj,
message,
{
missing: resolveContext.missing,
stack: resolveContext.stack
},
(err, result) => {
if (!err && result) {
return callback(
null,
result.path === false ? false : result.path + (result.query || ""),
result
);
}
const localMissing = new Set();
// TODO remove in enhanced-resolve 5
localMissing.push = item => deprecatedPushToMissing(localMissing, item);
const log = [];
return this.doResolve(
this.hooks.resolve,
obj,
message,
{
log: msg => {
if (resolveContext.log) {
resolveContext.log(msg);
}
log.push(msg);
},
missing: localMissing,
stack: resolveContext.stack
},
(err, result) => {
if (err) return callback(err);
const error = new Error("Can't " + message);
error.details = log.join("\n");
error.missing = Array.from(localMissing);
this.hooks.noResolve.call(obj, error);
return callback(error);
}
);
}
);
}
doResolve(hook, request, message, resolveContext, callback) {
// TODO remove in enhanced-resolve 5
// For backward compatiblity START
if (typeof callback !== "function") {
callback = deprecatedResolveContextInCallback(resolveContext);
// resolveContext is a function containing additional properties
// It's now used for resolveContext and callback
}
if (typeof hook === "string") {
const name = toCamelCase(hook);
hook = deprecatedHookAsString(this.hooks[name]);
if (!hook) {
throw new Error(`Hook "${name}" doesn't exist`);
}
}
// END
if (typeof callback !== "function")
throw new Error("callback is not a function " + Array.from(arguments));
if (!resolveContext)
throw new Error(
"resolveContext is not an object " + Array.from(arguments)
);
const stackLine =
hook.name +
": (" +
request.path +
") " +
(request.request || "") +
(request.query || "") +
(request.directory ? " directory" : "") +
(request.module ? " module" : "");
let newStack;
if (resolveContext.stack) {
newStack = new Set(resolveContext.stack);
if (resolveContext.stack.has(stackLine)) {
// Prevent recursion
const recursionError = new Error(
"Recursion in resolving\nStack:\n " +
Array.from(newStack).join("\n ")
);
recursionError.recursion = true;
if (resolveContext.log)
resolveContext.log("abort resolving because of recursion");
return callback(recursionError);
}
newStack.add(stackLine);
} else {
newStack = new Set([stackLine]);
}
this.hooks.resolveStep.call(hook, request);
if (hook.isUsed()) {
const innerContext = createInnerContext(
{
log: resolveContext.log,
missing: resolveContext.missing,
stack: newStack
},
message
);
return hook.callAsync(request, innerContext, (err, result) => {
if (err) return callback(err);
if (result) return callback(null, result);
callback();
});
} else {
callback();
}
}
parse(identifier) {
if (identifier === "") return null;
const part = {
request: "",
query: "",
module: false,
directory: false,
file: false
};
const idxQuery = identifier.indexOf("?");
if (idxQuery === 0) {
part.query = identifier;
} else if (idxQuery > 0) {
part.request = identifier.slice(0, idxQuery);
part.query = identifier.slice(idxQuery);
} else {
part.request = identifier;
}
if (part.request) {
part.module = this.isModule(part.request);
part.directory = this.isDirectory(part.request);
if (part.directory) {
part.request = part.request.substr(0, part.request.length - 1);
}
}
return part;
}
isModule(path) {
return !REGEXP_NOT_MODULE.test(path);
}
isDirectory(path) {
return REGEXP_DIRECTORY.test(path);
}
join(path, request) {
let cacheEntry;
let pathCache = memoizedJoin.get(path);
if (typeof pathCache === "undefined") {
memoizedJoin.set(path, (pathCache = new Map()));
} else {
cacheEntry = pathCache.get(request);
if (typeof cacheEntry !== "undefined") return cacheEntry;
}
cacheEntry = memoryFsJoin(path, request);
pathCache.set(request, cacheEntry);
return cacheEntry;
}
normalize(path) {
return memoryFsNormalize(path);
}
}
module.exports = Resolver;