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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
/** @typedef {import("./Dependency")} Dependency */
/** @typedef {import("./Module")} Module */
/** @typedef {import("./util/runtime").RuntimeSpec} RuntimeSpec */
/**
* Module itself is not connected, but transitive modules are connected transitively.
*/
const TRANSITIVE_ONLY = Symbol("transitive only");
/**
* While determining the active state, this flag is used to signal a circular connection.
*/
const CIRCULAR_CONNECTION = Symbol("circular connection");
/** @typedef {boolean | typeof TRANSITIVE_ONLY | typeof CIRCULAR_CONNECTION} ConnectionState */
/**
* @param {ConnectionState} a first
* @param {ConnectionState} b second
* @returns {ConnectionState} merged
*/
const addConnectionStates = (a, b) => {
if (a === true || b === true) return true;
if (a === false) return b;
if (b === false) return a;
if (a === TRANSITIVE_ONLY) return b;
if (b === TRANSITIVE_ONLY) return a;
return a;
};
/**
* @param {ConnectionState} a first
* @param {ConnectionState} b second
* @returns {ConnectionState} intersected
*/
const intersectConnectionStates = (a, b) => {
if (a === false || b === false) return false;
if (a === true) return b;
if (b === true) return a;
if (a === CIRCULAR_CONNECTION) return b;
if (b === CIRCULAR_CONNECTION) return a;
return a;
};
class ModuleGraphConnection {
/**
* @param {Module|null} originModule the referencing module
* @param {Dependency|null} dependency the referencing dependency
* @param {Module} module the referenced module
* @param {string=} explanation some extra detail
* @param {boolean=} weak the reference is weak
* @param {false | function(ModuleGraphConnection, RuntimeSpec): ConnectionState=} condition condition for the connection
*/
constructor(
originModule,
dependency,
module,
explanation,
weak = false,
condition = undefined
) {
this.originModule = originModule;
this.resolvedOriginModule = originModule;
this.dependency = dependency;
this.resolvedModule = module;
this.module = module;
this.weak = weak;
this.conditional = !!condition;
this._active = condition !== false;
/** @type {function(ModuleGraphConnection, RuntimeSpec): ConnectionState} */
this.condition = condition || undefined;
/** @type {Set<string>} */
this.explanations = undefined;
if (explanation) {
this.explanations = new Set();
this.explanations.add(explanation);
}
}
clone() {
const clone = new ModuleGraphConnection(
this.resolvedOriginModule,
this.dependency,
this.resolvedModule,
undefined,
this.weak,
this.condition
);
clone.originModule = this.originModule;
clone.module = this.module;
clone.conditional = this.conditional;
clone._active = this._active;
if (this.explanations) clone.explanations = new Set(this.explanations);
return clone;
}
/**
* @param {function(ModuleGraphConnection, RuntimeSpec): ConnectionState} condition condition for the connection
* @returns {void}
*/
addCondition(condition) {
if (this.conditional) {
const old = this.condition;
this.condition = (c, r) =>
intersectConnectionStates(old(c, r), condition(c, r));
} else if (this._active) {
this.conditional = true;
this.condition = condition;
}
}
/**
* @param {string} explanation the explanation to add
* @returns {void}
*/
addExplanation(explanation) {
if (this.explanations === undefined) {
this.explanations = new Set();
}
this.explanations.add(explanation);
}
get explanation() {
if (this.explanations === undefined) return "";
return Array.from(this.explanations).join(" ");
}
// TODO webpack 5 remove
get active() {
throw new Error("Use getActiveState instead");
}
/**
* @param {RuntimeSpec} runtime the runtime
* @returns {boolean} true, if the connection is active
*/
isActive(runtime) {
if (!this.conditional) return this._active;
return this.condition(this, runtime) !== false;
}
/**
* @param {RuntimeSpec} runtime the runtime
* @returns {boolean} true, if the connection is active
*/
isTargetActive(runtime) {
if (!this.conditional) return this._active;
return this.condition(this, runtime) === true;
}
/**
* @param {RuntimeSpec} runtime the runtime
* @returns {ConnectionState} true: fully active, false: inactive, TRANSITIVE: direct module inactive, but transitive connection maybe active
*/
getActiveState(runtime) {
if (!this.conditional) return this._active;
return this.condition(this, runtime);
}
/**
* @param {boolean} value active or not
* @returns {void}
*/
setActive(value) {
this.conditional = false;
this._active = value;
}
set active(value) {
throw new Error("Use setActive instead");
}
}
/** @typedef {typeof TRANSITIVE_ONLY} TRANSITIVE_ONLY */
/** @typedef {typeof CIRCULAR_CONNECTION} CIRCULAR_CONNECTION */
module.exports = ModuleGraphConnection;
module.exports.addConnectionStates = addConnectionStates;
module.exports.TRANSITIVE_ONLY = /** @type {typeof TRANSITIVE_ONLY} */ (
TRANSITIVE_ONLY
);
module.exports.CIRCULAR_CONNECTION = /** @type {typeof CIRCULAR_CONNECTION} */ (
CIRCULAR_CONNECTION
);