chushihua

node_modules/enhanced-resolve/lib/AliasPlugin.js

@@ -0,0 +1,57 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+var createInnerCallback = require("./createInnerCallback");
+
+function startsWith(string, searchString) {
+	var stringLength = string.length;
+	var searchLength = searchString.length;
+
+	// early out if the search length is greater than the search string
+	if(searchLength > stringLength) {
+		return false;
+	}
+	var index = -1;
+	while(++index < searchLength) {
+		if(string.charCodeAt(index) !== searchString.charCodeAt(index)) {
+			return false;
+		}
+	}
+	return true;
+}
+
+function AliasPlugin(source, options, target) {
+	this.source = source;
+	this.name = options.name;
+	this.alias = options.alias;
+	this.onlyModule = options.onlyModule;
+	this.target = target;
+}
+module.exports = AliasPlugin;
+
+AliasPlugin.prototype.apply = function(resolver) {
+	var target = this.target;
+	var name = this.name;
+	var alias = this.alias;
+	var onlyModule = this.onlyModule;
+	resolver.plugin(this.source, function(request, callback) {
+		var innerRequest = request.request;
+		if(!innerRequest) return callback();
+		if(innerRequest === name || (!onlyModule && startsWith(innerRequest, name + "/"))) {
+			if(innerRequest !== alias && !startsWith(innerRequest, alias + "/")) {
+				var newRequestStr = alias + innerRequest.substr(name.length);
+				var obj = Object.assign({}, request, {
+					request: newRequestStr
+				});
+				return resolver.doResolve(target, obj, "aliased with mapping '" + name + "': '" + alias + "' to '" + newRequestStr + "'", createInnerCallback(function(err, result) {
+					if(arguments.length > 0) return callback(err, result);
+
+					// don't allow other aliasing or raw request
+					callback(null, null);
+				}, callback));
+			}
+		}
+		return callback();
+	});
+};