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node_modules/webpack/lib/dependencies/CssLocalIdentifierDependency.js

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+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Ivan Kopeykin @vankop
+*/
+
+"use strict";
+
+const createHash = require("../util/createHash");
+const { makePathsRelative } = require("../util/identifier");
+const makeSerializable = require("../util/makeSerializable");
+const NullDependency = require("./NullDependency");
+
+/** @typedef {import("webpack-sources").ReplaceSource} ReplaceSource */
+/** @typedef {import("../../declarations/WebpackOptions").CssGeneratorExportsConvention} CssGeneratorExportsConvention */
+/** @typedef {import("../../declarations/WebpackOptions").CssGeneratorLocalIdentName} CssGeneratorLocalIdentName */
+/** @typedef {import("../ChunkGraph")} ChunkGraph */
+/** @typedef {import("../CssModule")} CssModule */
+/** @typedef {import("../Dependency")} Dependency */
+/** @typedef {import("../Dependency").ExportsSpec} ExportsSpec */
+/** @typedef {import("../DependencyTemplate").CssDependencyTemplateContext} DependencyTemplateContext */
+/** @typedef {import("../ModuleGraph")} ModuleGraph */
+/** @typedef {import("../RuntimeTemplate")} RuntimeTemplate */
+/** @typedef {import("../css/CssExportsGenerator")} CssExportsGenerator */
+/** @typedef {import("../css/CssGenerator")} CssGenerator */
+/** @typedef {import("../css/CssParser").Range} Range */
+/** @typedef {import("../serialization/ObjectMiddleware").ObjectDeserializerContext} ObjectDeserializerContext */
+/** @typedef {import("../serialization/ObjectMiddleware").ObjectSerializerContext} ObjectSerializerContext */
+
+/**
+ * @param {string} local css local
+ * @param {CssModule} module module
+ * @param {ChunkGraph} chunkGraph chunk graph
+ * @param {RuntimeTemplate} runtimeTemplate runtime template
+ * @returns {string} local ident
+ */
+const getLocalIdent = (local, module, chunkGraph, runtimeTemplate) => {
+	const localIdentName =
+		/** @type {CssGenerator | CssExportsGenerator} */
+		(module.generator).localIdentName;
+	const relativeResourcePath = makePathsRelative(
+		/** @type {string} */ (module.context),
+		module.resourceResolveData.path
+	);
+	const { hashFunction, hashDigest, hashDigestLength, hashSalt, uniqueName } =
+		runtimeTemplate.outputOptions;
+	const hash = createHash(hashFunction);
+	if (hashSalt) {
+		hash.update(hashSalt);
+	}
+	hash.update(relativeResourcePath);
+	if (!/\[local\]/.test(localIdentName)) {
+		hash.update(local);
+	}
+	const localIdentHash = /** @type {string} */ (hash.digest(hashDigest))
+		// Remove all leading digits
+		.replace(/^\d+/, "")
+		// Replace all slashes with underscores (same as in base64url)
+		.replace(/\//g, "_")
+		// Remove everything that is not an alphanumeric or underscore
+		.replace(/[^A-Za-z0-9_]+/g, "_")
+		.slice(0, hashDigestLength);
+	return runtimeTemplate.compilation
+		.getPath(localIdentName, {
+			filename: relativeResourcePath,
+			hash: localIdentHash,
+			contentHash: localIdentHash,
+			chunkGraph,
+			module
+		})
+		.replace(/\[local\]/g, local)
+		.replace(/\[uniqueName\]/g, uniqueName);
+};
+
+class CssLocalIdentifierDependency extends NullDependency {
+	/**
+	 * @param {string} name name
+	 * @param {Range} range range
+	 * @param {string=} prefix prefix
+	 */
+	constructor(name, range, prefix = "") {
+		super();
+		this.name = name;
+		this.range = range;
+		this.prefix = prefix;
+	}
+
+	get type() {
+		return "css local identifier";
+	}
+
+	/**
+	 * Returns the exported names
+	 * @param {ModuleGraph} moduleGraph module graph
+	 * @returns {ExportsSpec | undefined} export names
+	 */
+	getExports(moduleGraph) {
+		const name = this.name;
+		return {
+			exports: [
+				{
+					name,
+					canMangle: true
+				}
+			],
+			dependencies: undefined
+		};
+	}
+
+	/**
+	 * @param {ObjectSerializerContext} context context
+	 */
+	serialize(context) {
+		const { write } = context;
+		write(this.name);
+		write(this.range);
+		write(this.prefix);
+		super.serialize(context);
+	}
+
+	/**
+	 * @param {ObjectDeserializerContext} context context
+	 */
+	deserialize(context) {
+		const { read } = context;
+		this.name = read();
+		this.range = read();
+		this.prefix = read();
+		super.deserialize(context);
+	}
+}
+
+/**
+ * @param {string} str string
+ * @param {string | boolean} omitUnderscore true if you need to omit underscore
+ * @returns {string} escaped css identifier
+ */
+const escapeCssIdentifier = (str, omitUnderscore) => {
+	const escaped = `${str}`.replace(
+		// cspell:word uffff
+		/[^a-zA-Z0-9_\u0081-\uffff-]/g,
+		s => `\\${s}`
+	);
+	return !omitUnderscore && /^(?!--)[0-9-]/.test(escaped)
+		? `_${escaped}`
+		: escaped;
+};
+
+CssLocalIdentifierDependency.Template = class CssLocalIdentifierDependencyTemplate extends (
+	NullDependency.Template
+) {
+	/**
+	 * @param {Dependency} dependency the dependency for which the template should be applied
+	 * @param {ReplaceSource} source the current replace source which can be modified
+	 * @param {DependencyTemplateContext} templateContext the context object
+	 * @returns {void}
+	 */
+	apply(
+		dependency,
+		source,
+		{
+			module,
+			moduleGraph,
+			chunkGraph,
+			runtime,
+			runtimeTemplate,
+			cssExportsData
+		}
+	) {
+		const dep = /** @type {CssLocalIdentifierDependency} */ (dependency);
+		const used = moduleGraph
+			.getExportInfo(module, dep.name)
+			.getUsedName(dep.name, runtime);
+
+		if (!used) return;
+
+		const localIdent =
+			dep.prefix +
+			getLocalIdent(
+				used,
+				/** @type {CssModule} */ (module),
+				chunkGraph,
+				runtimeTemplate
+			);
+		source.replace(
+			dep.range[0],
+			dep.range[1] - 1,
+			escapeCssIdentifier(localIdent, dep.prefix)
+		);
+		if (used) cssExportsData.exports.set(used, localIdent);
+	}
+};
+
+makeSerializable(
+	CssLocalIdentifierDependency,
+	"webpack/lib/dependencies/CssLocalIdentifierDependency"
+);
+
+module.exports = CssLocalIdentifierDependency;