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node_modules/webpack/lib/dependencies/RequireResolveDependencyParserPlugin.js 2.64 KB
aaac7fed   liuqimichale   add
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  /*
  	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;
  		parser.plugin("call require.resolve", (expr) => {
  			return parser.applyPluginsBailResult("call require.resolve(Weak)", expr, false);
  		});
  		parser.plugin("call require.resolveWeak", (expr) => {
  			return parser.applyPluginsBailResult("call require.resolve(Weak)", expr, true);
  		});
  		parser.plugin("call require.resolve(Weak)", (expr, weak) => {
  			if(expr.arguments.length !== 1) return;
  			const param = parser.evaluateExpression(expr.arguments[0]);
  			if(param.isConditional()) {
  				param.options.forEach((option) => {
  					const result = parser.applyPluginsBailResult("call require.resolve(Weak):item", expr, option, weak);
  					if(result === undefined) {
  						parser.applyPluginsBailResult("call require.resolve(Weak):context", expr, option, weak);
  					}
  				});
  				const dep = new RequireResolveHeaderDependency(expr.callee.range);
  				dep.loc = expr.loc;
  				parser.state.current.addDependency(dep);
  				return true;
  			} else {
  				const result = parser.applyPluginsBailResult("call require.resolve(Weak):item", expr, param, weak);
  				if(result === undefined) {
  					parser.applyPluginsBailResult("call require.resolve(Weak):context", expr, param, weak);
  				}
  				const dep = new RequireResolveHeaderDependency(expr.callee.range);
  				dep.loc = expr.loc;
  				parser.state.current.addDependency(dep);
  				return true;
  			}
  		});
  		parser.plugin("call require.resolve(Weak):item", (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;
  			}
  		});
  		parser.plugin("call require.resolve(Weak):context", (expr, param, weak) => {
  			const dep = ContextDependencyHelpers.create(RequireResolveContextDependency, param.range, param, expr, options);
  			if(!dep) return;
  			dep.loc = expr.loc;
  			dep.optional = !!parser.scope.inTry;
  			dep.async = weak ? "weak" : false;
  			parser.state.current.addDependency(dep);
  			return true;
  		});
  	}
  }
  module.exports = RequireResolveDependencyParserPlugin;