webpack/lib/dependencies/CssLocalIdentifierDependency.js

Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support loaders to preprocess files, i.e. json, jsx, es7, css, less, ... and your custom stuff.

/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Ivan Kopeykin @vankop
*/

"use strict";

const makeSerializable = require("../util/makeSerializable");
const NullDependency = require("./NullDependency");

/** @typedef {import("webpack-sources").ReplaceSource} ReplaceSource */
/** @typedef {import("../Dependency")} Dependency */
/** @typedef {import("../Dependency").ExportsSpec} ExportsSpec */
/** @typedef {import("../DependencyTemplate").CssDependencyTemplateContext} DependencyTemplateContext */
/** @typedef {import("../ModuleGraph")} ModuleGraph */

class CssLocalIdentifierDependency extends NullDependency {
	/**
	 * @param {string} name name
	 * @param {[number, number]} 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
		};
	}

	serialize(context) {
		const { write } = context;
		write(this.name);
		write(this.range);
		write(this.prefix);
		super.serialize(context);
	}

	deserialize(context) {
		const { read } = context;
		this.name = read();
		this.range = read();
		this.prefix = read();
		super.deserialize(context);
	}
}

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, cssExports }
	) {
		const dep = /** @type {CssLocalIdentifierDependency} */ (dependency);
		const used = moduleGraph
			.getExportInfo(module, dep.name)
			.getUsedName(dep.name, runtime);
		const moduleId = chunkGraph.getModuleId(module);
		const identifier =
			dep.prefix +
			(runtimeTemplate.outputOptions.uniqueName
				? runtimeTemplate.outputOptions.uniqueName + "-"
				: "") +
			(used ? moduleId + "-" + used : "-");
		source.replace(
			dep.range[0],
			dep.range[1] - 1,
			escapeCssIdentifier(identifier, dep.prefix)
		);
		if (used) cssExports.set(used, identifier);
	}
};

makeSerializable(
	CssLocalIdentifierDependency,
	"webpack/lib/dependencies/CssLocalIdentifierDependency"
);

module.exports = CssLocalIdentifierDependency;