webpack/lib/dependencies/CssUrlDependency.js

Packs ECMAScript/CommonJs/AMD modules for the browser. Allows you to split your codebase into multiple bundles, which can be loaded on demand. Supports 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 RawDataUrlModule = require("../asset/RawDataUrlModule");
const makeSerializable = require("../util/makeSerializable");
const memoize = require("../util/memoize");
const ModuleDependency = require("./ModuleDependency");

/** @typedef {import("webpack-sources").ReplaceSource} ReplaceSource */
/** @typedef {import("../ChunkGraph")} ChunkGraph */
/** @typedef {import("../Dependency")} Dependency */
/** @typedef {import("../Dependency").UpdateHashContext} UpdateHashContext */
/** @typedef {import("../DependencyTemplate").DependencyTemplateContext} DependencyTemplateContext */
/** @typedef {import("../Module")} Module */
/** @typedef {import("../ModuleGraph")} ModuleGraph */
/** @typedef {import("../ModuleGraphConnection")} ModuleGraphConnection */
/** @typedef {import("../ModuleGraphConnection").ConnectionState} ConnectionState */
/** @typedef {import("../javascript/JavascriptParser").Range} Range */
/** @typedef {import("../serialization/ObjectMiddleware").ObjectDeserializerContext} ObjectDeserializerContext */
/** @typedef {import("../serialization/ObjectMiddleware").ObjectSerializerContext} ObjectSerializerContext */
/** @typedef {import("../util/Hash")} Hash */
/** @typedef {import("../util/runtime").RuntimeSpec} RuntimeSpec */

const getIgnoredRawDataUrlModule = memoize(() => {
	return new RawDataUrlModule("data:,", `ignored-asset`, `(ignored asset)`);
});

class CssUrlDependency extends ModuleDependency {
	/**
	 * @param {string} request request
	 * @param {Range} range range of the argument
	 * @param {"string" | "url"} urlType dependency type e.g. url() or string
	 */
	constructor(request, range, urlType) {
		super(request);
		this.range = range;
		this.urlType = urlType;
	}

	get type() {
		return "css url()";
	}

	get category() {
		return "url";
	}

	/**
	 * @param {string} context context directory
	 * @returns {Module | null} a module
	 */
	createIgnoredModule(context) {
		return getIgnoredRawDataUrlModule();
	}

	/**
	 * @param {ObjectSerializerContext} context context
	 */
	serialize(context) {
		const { write } = context;
		write(this.urlType);
		super.serialize(context);
	}

	/**
	 * @param {ObjectDeserializerContext} context context
	 */
	deserialize(context) {
		const { read } = context;
		this.urlType = read();
		super.deserialize(context);
	}
}

/**
 * @param {string} str string
 * @returns {string} string in quotes if needed
 */
const cssEscapeString = str => {
	let countWhiteOrBracket = 0;
	let countQuotation = 0;
	let countApostrophe = 0;
	for (let i = 0; i < str.length; i++) {
		const cc = str.charCodeAt(i);
		switch (cc) {
			case 9: // tab
			case 10: // nl
			case 32: // space
			case 40: // (
			case 41: // )
				countWhiteOrBracket++;
				break;
			case 34:
				countQuotation++;
				break;
			case 39:
				countApostrophe++;
				break;
		}
	}
	if (countWhiteOrBracket < 2) {
		return str.replace(/[\n\t ()'"\\]/g, m => `\\${m}`);
	} else if (countQuotation <= countApostrophe) {
		return `"${str.replace(/[\n"\\]/g, m => `\\${m}`)}"`;
	} else {
		return `'${str.replace(/[\n'\\]/g, m => `\\${m}`)}'`;
	}
};

CssUrlDependency.Template = class CssUrlDependencyTemplate extends (
	ModuleDependency.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,
		{ moduleGraph, runtimeTemplate, codeGenerationResults }
	) {
		const dep = /** @type {CssUrlDependency} */ (dependency);
		const module = /** @type {Module} */ (moduleGraph.getModule(dep));

		/** @type {string | undefined} */
		let newValue;

		switch (dep.urlType) {
			case "string":
				newValue = cssEscapeString(
					runtimeTemplate.assetUrl({
						module,
						codeGenerationResults
					})
				);
				break;
			case "url":
				newValue = `url(${cssEscapeString(
					runtimeTemplate.assetUrl({
						module,
						codeGenerationResults
					})
				)})`;
				break;
		}

		source.replace(
			dep.range[0],
			dep.range[1] - 1,
			/** @type {string} */ (newValue)
		);
	}
};

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

CssUrlDependency.PUBLIC_PATH_AUTO = "__WEBPACK_CSS_PUBLIC_PATH_AUTO__";

module.exports = CssUrlDependency;