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app_vue/node_modules/webpack/lib/optimize/InnerGraph.js

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+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Sergey Melyukov @smelukov
+*/
+
+"use strict";
+
+const { UsageState } = require("../ExportsInfo");
+
+/** @typedef {import("estree").Node} AnyNode */
+/** @typedef {import("../Dependency")} Dependency */
+/** @typedef {import("../Dependency").GetConditionFn} GetConditionFn */
+/** @typedef {import("../Module")} Module */
+/** @typedef {import("../ModuleGraph")} ModuleGraph */
+/** @typedef {import("../ModuleGraphConnection")} ModuleGraphConnection */
+/** @typedef {import("../ModuleGraphConnection").ConnectionState} ConnectionState */
+/** @typedef {import("../Parser").ParserState} ParserState */
+/** @typedef {import("../javascript/JavascriptParser")} JavascriptParser */
+/** @typedef {import("../util/runtime").RuntimeSpec} RuntimeSpec */
+
+/** @typedef {Map<TopLevelSymbol | null, Set<string | TopLevelSymbol> | true | undefined>} InnerGraph */
+/** @typedef {(value: boolean | Set<string> | undefined) => void} UsageCallback */
+
+/**
+ * @typedef {object} StateObject
+ * @property {InnerGraph} innerGraph
+ * @property {TopLevelSymbol=} currentTopLevelSymbol
+ * @property {Map<TopLevelSymbol, Set<UsageCallback>>} usageCallbackMap
+ */
+
+/** @typedef {false|StateObject} State */
+
+/** @type {WeakMap<ParserState, State>} */
+const parserStateMap = new WeakMap();
+const topLevelSymbolTag = Symbol("top level symbol");
+
+/**
+ * @param {ParserState} parserState parser state
+ * @returns {State | undefined} state
+ */
+function getState(parserState) {
+	return parserStateMap.get(parserState);
+}
+
+/**
+ * @param {ParserState} parserState parser state
+ * @returns {void}
+ */
+module.exports.bailout = parserState => {
+	parserStateMap.set(parserState, false);
+};
+
+/**
+ * @param {ParserState} parserState parser state
+ * @returns {void}
+ */
+module.exports.enable = parserState => {
+	const state = parserStateMap.get(parserState);
+	if (state === false) {
+		return;
+	}
+	parserStateMap.set(parserState, {
+		innerGraph: new Map(),
+		currentTopLevelSymbol: undefined,
+		usageCallbackMap: new Map()
+	});
+};
+
+/**
+ * @param {ParserState} parserState parser state
+ * @returns {boolean} true, when enabled
+ */
+module.exports.isEnabled = parserState => {
+	const state = parserStateMap.get(parserState);
+	return Boolean(state);
+};
+
+/**
+ * @param {ParserState} state parser state
+ * @param {TopLevelSymbol | null} symbol the symbol, or null for all symbols
+ * @param {string | TopLevelSymbol | true} usage usage data
+ * @returns {void}
+ */
+module.exports.addUsage = (state, symbol, usage) => {
+	const innerGraphState = getState(state);
+
+	if (innerGraphState) {
+		const { innerGraph } = innerGraphState;
+		const info = innerGraph.get(symbol);
+		if (usage === true) {
+			innerGraph.set(symbol, true);
+		} else if (info === undefined) {
+			innerGraph.set(symbol, new Set([usage]));
+		} else if (info !== true) {
+			info.add(usage);
+		}
+	}
+};
+
+/**
+ * @param {JavascriptParser} parser the parser
+ * @param {string} name name of variable
+ * @param {string | TopLevelSymbol | true} usage usage data
+ * @returns {void}
+ */
+module.exports.addVariableUsage = (parser, name, usage) => {
+	const symbol =
+		/** @type {TopLevelSymbol} */ (
+			parser.getTagData(name, topLevelSymbolTag)
+		) || module.exports.tagTopLevelSymbol(parser, name);
+	if (symbol) {
+		module.exports.addUsage(parser.state, symbol, usage);
+	}
+};
+
+/**
+ * @param {ParserState} state parser state
+ * @returns {void}
+ */
+module.exports.inferDependencyUsage = state => {
+	const innerGraphState = getState(state);
+
+	if (!innerGraphState) {
+		return;
+	}
+
+	const { innerGraph, usageCallbackMap } = innerGraphState;
+	const processed = new Map();
+	// flatten graph to terminal nodes (string, undefined or true)
+	const nonTerminal = new Set(innerGraph.keys());
+	while (nonTerminal.size > 0) {
+		for (const key of nonTerminal) {
+			/** @type {Set<string|TopLevelSymbol> | true} */
+			let newSet = new Set();
+			let isTerminal = true;
+			const value = innerGraph.get(key);
+			let alreadyProcessed = processed.get(key);
+			if (alreadyProcessed === undefined) {
+				alreadyProcessed = new Set();
+				processed.set(key, alreadyProcessed);
+			}
+			if (value !== true && value !== undefined) {
+				for (const item of value) {
+					alreadyProcessed.add(item);
+				}
+				for (const item of value) {
+					if (typeof item === "string") {
+						newSet.add(item);
+					} else {
+						const itemValue = innerGraph.get(item);
+						if (itemValue === true) {
+							newSet = true;
+							break;
+						}
+						if (itemValue !== undefined) {
+							for (const i of itemValue) {
+								if (i === key) continue;
+								if (alreadyProcessed.has(i)) continue;
+								newSet.add(i);
+								if (typeof i !== "string") {
+									isTerminal = false;
+								}
+							}
+						}
+					}
+				}
+				if (newSet === true) {
+					innerGraph.set(key, true);
+				} else if (newSet.size === 0) {
+					innerGraph.set(key, undefined);
+				} else {
+					innerGraph.set(key, newSet);
+				}
+			}
+			if (isTerminal) {
+				nonTerminal.delete(key);
+
+				// For the global key, merge with all other keys
+				if (key === null) {
+					const globalValue = innerGraph.get(null);
+					if (globalValue) {
+						for (const [key, value] of innerGraph) {
+							if (key !== null && value !== true) {
+								if (globalValue === true) {
+									innerGraph.set(key, true);
+								} else {
+									const newSet = new Set(value);
+									for (const item of globalValue) {
+										newSet.add(item);
+									}
+									innerGraph.set(key, newSet);
+								}
+							}
+						}
+					}
+				}
+			}
+		}
+	}
+
+	/** @type {Map<Dependency, true | Set<string>>} */
+	for (const [symbol, callbacks] of usageCallbackMap) {
+		const usage = /** @type {true | Set<string> | undefined} */ (
+			innerGraph.get(symbol)
+		);
+		for (const callback of callbacks) {
+			callback(usage === undefined ? false : usage);
+		}
+	}
+};
+
+/**
+ * @param {ParserState} state parser state
+ * @param {UsageCallback} onUsageCallback on usage callback
+ */
+module.exports.onUsage = (state, onUsageCallback) => {
+	const innerGraphState = getState(state);
+
+	if (innerGraphState) {
+		const { usageCallbackMap, currentTopLevelSymbol } = innerGraphState;
+		if (currentTopLevelSymbol) {
+			let callbacks = usageCallbackMap.get(currentTopLevelSymbol);
+
+			if (callbacks === undefined) {
+				callbacks = new Set();
+				usageCallbackMap.set(currentTopLevelSymbol, callbacks);
+			}
+
+			callbacks.add(onUsageCallback);
+		} else {
+			onUsageCallback(true);
+		}
+	} else {
+		onUsageCallback(undefined);
+	}
+};
+
+/**
+ * @param {ParserState} state parser state
+ * @param {TopLevelSymbol | undefined} symbol the symbol
+ */
+module.exports.setTopLevelSymbol = (state, symbol) => {
+	const innerGraphState = getState(state);
+
+	if (innerGraphState) {
+		innerGraphState.currentTopLevelSymbol = symbol;
+	}
+};
+
+/**
+ * @param {ParserState} state parser state
+ * @returns {TopLevelSymbol|void} usage data
+ */
+module.exports.getTopLevelSymbol = state => {
+	const innerGraphState = getState(state);
+
+	if (innerGraphState) {
+		return innerGraphState.currentTopLevelSymbol;
+	}
+};
+
+/**
+ * @param {JavascriptParser} parser parser
+ * @param {string} name name of variable
+ * @returns {TopLevelSymbol | undefined} symbol
+ */
+module.exports.tagTopLevelSymbol = (parser, name) => {
+	const innerGraphState = getState(parser.state);
+	if (!innerGraphState) return;
+
+	parser.defineVariable(name);
+
+	const existingTag = /** @type {TopLevelSymbol} */ (
+		parser.getTagData(name, topLevelSymbolTag)
+	);
+	if (existingTag) {
+		return existingTag;
+	}
+
+	const fn = new TopLevelSymbol(name);
+	parser.tagVariable(name, topLevelSymbolTag, fn);
+	return fn;
+};
+
+/**
+ * @param {Dependency} dependency the dependency
+ * @param {Set<string> | boolean} usedByExports usedByExports info
+ * @param {ModuleGraph} moduleGraph moduleGraph
+ * @param {RuntimeSpec} runtime runtime
+ * @returns {boolean} false, when unused. Otherwise true
+ */
+module.exports.isDependencyUsedByExports = (
+	dependency,
+	usedByExports,
+	moduleGraph,
+	runtime
+) => {
+	if (usedByExports === false) return false;
+	if (usedByExports !== true && usedByExports !== undefined) {
+		const selfModule =
+			/** @type {Module} */
+			(moduleGraph.getParentModule(dependency));
+		const exportsInfo = moduleGraph.getExportsInfo(selfModule);
+		let used = false;
+		for (const exportName of usedByExports) {
+			if (exportsInfo.getUsed(exportName, runtime) !== UsageState.Unused)
+				used = true;
+		}
+		if (!used) return false;
+	}
+	return true;
+};
+
+/**
+ * @param {Dependency} dependency the dependency
+ * @param {Set<string> | boolean | undefined} usedByExports usedByExports info
+ * @param {ModuleGraph} moduleGraph moduleGraph
+ * @returns {null | false | GetConditionFn} function to determine if the connection is active
+ */
+module.exports.getDependencyUsedByExportsCondition = (
+	dependency,
+	usedByExports,
+	moduleGraph
+) => {
+	if (usedByExports === false) return false;
+	if (usedByExports !== true && usedByExports !== undefined) {
+		const selfModule =
+			/** @type {Module} */
+			(moduleGraph.getParentModule(dependency));
+		const exportsInfo = moduleGraph.getExportsInfo(selfModule);
+		return (connections, runtime) => {
+			for (const exportName of usedByExports) {
+				if (exportsInfo.getUsed(exportName, runtime) !== UsageState.Unused)
+					return true;
+			}
+			return false;
+		};
+	}
+	return null;
+};
+
+class TopLevelSymbol {
+	/**
+	 * @param {string} name name of the variable
+	 */
+	constructor(name) {
+		this.name = name;
+	}
+}
+
+module.exports.TopLevelSymbol = TopLevelSymbol;
+module.exports.topLevelSymbolTag = topLevelSymbolTag;