webpack/lib/dependencies/RequireResolveDependencyParserPlugin.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 Tobias Koppers @sokra
*/
"use strict";

const RequireResolveDependency = require("./RequireResolveDependency");
const RequireResolveContextDependency = require("./RequireResolveContextDependency");
const RequireResolveHeaderDependency = require("./RequireResolveHeaderDependency");
const ContextDependencyHelpers = require("./ContextDependencyHelpers");

class RequireResolveDependencyParserPlugin {
	constructor(options) {
		this.options = options;
	}

	apply(parser) {
		const options = this.options;

		const process = (expr, weak) => {
			if (expr.arguments.length !== 1) return;
			const param = parser.evaluateExpression(expr.arguments[0]);
			if (param.isConditional()) {
				for (const option of param.options) {
					const result = processItem(expr, option, weak);
					if (result === undefined) {
						processContext(expr, option, weak);
					}
				}
				const dep = new RequireResolveHeaderDependency(expr.callee.range);
				dep.loc = expr.loc;
				parser.state.current.addDependency(dep);
				return true;
			} else {
				const result = processItem(expr, param, weak);
				if (result === undefined) {
					processContext(expr, param, weak);
				}
				const dep = new RequireResolveHeaderDependency(expr.callee.range);
				dep.loc = expr.loc;
				parser.state.current.addDependency(dep);
				return true;
			}
		};
		const processItem = (expr, param, weak) => {
			if (param.isString()) {
				const dep = new RequireResolveDependency(param.string, param.range);
				dep.loc = expr.loc;
				dep.optional = !!parser.scope.inTry;
				dep.weak = weak;
				parser.state.current.addDependency(dep);
				return true;
			}
		};
		const processContext = (expr, param, weak) => {
			const dep = ContextDependencyHelpers.create(
				RequireResolveContextDependency,
				param.range,
				param,
				expr,
				options,
				{
					mode: weak ? "weak" : "sync"
				},
				parser
			);
			if (!dep) return;
			dep.loc = expr.loc;
			dep.optional = !!parser.scope.inTry;
			parser.state.current.addDependency(dep);
			return true;
		};

		parser.hooks.call
			.for("require.resolve")
			.tap("RequireResolveDependencyParserPlugin", expr => {
				return process(expr, false);
			});
		parser.hooks.call
			.for("require.resolveWeak")
			.tap("RequireResolveDependencyParserPlugin", expr => {
				return process(expr, true);
			});
	}
}
module.exports = RequireResolveDependencyParserPlugin;