--- /dev/null
+/*
+ Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are met:
+
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+ DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+"use strict";
+
+/* eslint-disable no-underscore-dangle */
+
+const Scope = require("./scope");
+const assert = require("assert");
+
+const GlobalScope = Scope.GlobalScope;
+const CatchScope = Scope.CatchScope;
+const WithScope = Scope.WithScope;
+const ModuleScope = Scope.ModuleScope;
+const ClassScope = Scope.ClassScope;
+const SwitchScope = Scope.SwitchScope;
+const FunctionScope = Scope.FunctionScope;
+const ForScope = Scope.ForScope;
+const FunctionExpressionNameScope = Scope.FunctionExpressionNameScope;
+const BlockScope = Scope.BlockScope;
+
+/**
+ * @class ScopeManager
+ */
+class ScopeManager {
+ constructor(options) {
+ this.scopes = [];
+ this.globalScope = null;
+ this.__nodeToScope = new WeakMap();
+ this.__currentScope = null;
+ this.__options = options;
+ this.__declaredVariables = new WeakMap();
+ }
+
+ __useDirective() {
+ return this.__options.directive;
+ }
+
+ __isOptimistic() {
+ return this.__options.optimistic;
+ }
+
+ __ignoreEval() {
+ return this.__options.ignoreEval;
+ }
+
+ __isNodejsScope() {
+ return this.__options.nodejsScope;
+ }
+
+ isModule() {
+ return this.__options.sourceType === "module";
+ }
+
+ isImpliedStrict() {
+ return this.__options.impliedStrict;
+ }
+
+ isStrictModeSupported() {
+ return this.__options.ecmaVersion >= 5;
+ }
+
+ // Returns appropriate scope for this node.
+ __get(node) {
+ return this.__nodeToScope.get(node);
+ }
+
+ /**
+ * Get variables that are declared by the node.
+ *
+ * "are declared by the node" means the node is same as `Variable.defs[].node` or `Variable.defs[].parent`.
+ * If the node declares nothing, this method returns an empty array.
+ * CAUTION: This API is experimental. See https://github.com/estools/escope/pull/69 for more details.
+ *
+ * @param {Espree.Node} node - a node to get.
+ * @returns {Variable[]} variables that declared by the node.
+ */
+ getDeclaredVariables(node) {
+ return this.__declaredVariables.get(node) || [];
+ }
+
+ /**
+ * acquire scope from node.
+ * @method ScopeManager#acquire
+ * @param {Espree.Node} node - node for the acquired scope.
+ * @param {boolean=} inner - look up the most inner scope, default value is false.
+ * @returns {Scope?} Scope from node
+ */
+ acquire(node, inner) {
+
+ /**
+ * predicate
+ * @param {Scope} testScope - scope to test
+ * @returns {boolean} predicate
+ */
+ function predicate(testScope) {
+ if (testScope.type === "function" && testScope.functionExpressionScope) {
+ return false;
+ }
+ return true;
+ }
+
+ const scopes = this.__get(node);
+
+ if (!scopes || scopes.length === 0) {
+ return null;
+ }
+
+ // Heuristic selection from all scopes.
+ // If you would like to get all scopes, please use ScopeManager#acquireAll.
+ if (scopes.length === 1) {
+ return scopes[0];
+ }
+
+ if (inner) {
+ for (let i = scopes.length - 1; i >= 0; --i) {
+ const scope = scopes[i];
+
+ if (predicate(scope)) {
+ return scope;
+ }
+ }
+ } else {
+ for (let i = 0, iz = scopes.length; i < iz; ++i) {
+ const scope = scopes[i];
+
+ if (predicate(scope)) {
+ return scope;
+ }
+ }
+ }
+
+ return null;
+ }
+
+ /**
+ * acquire all scopes from node.
+ * @method ScopeManager#acquireAll
+ * @param {Espree.Node} node - node for the acquired scope.
+ * @returns {Scopes?} Scope array
+ */
+ acquireAll(node) {
+ return this.__get(node);
+ }
+
+ /**
+ * release the node.
+ * @method ScopeManager#release
+ * @param {Espree.Node} node - releasing node.
+ * @param {boolean=} inner - look up the most inner scope, default value is false.
+ * @returns {Scope?} upper scope for the node.
+ */
+ release(node, inner) {
+ const scopes = this.__get(node);
+
+ if (scopes && scopes.length) {
+ const scope = scopes[0].upper;
+
+ if (!scope) {
+ return null;
+ }
+ return this.acquire(scope.block, inner);
+ }
+ return null;
+ }
+
+ attach() { } // eslint-disable-line class-methods-use-this
+
+ detach() { } // eslint-disable-line class-methods-use-this
+
+ __nestScope(scope) {
+ if (scope instanceof GlobalScope) {
+ assert(this.__currentScope === null);
+ this.globalScope = scope;
+ }
+ this.__currentScope = scope;
+ return scope;
+ }
+
+ __nestGlobalScope(node) {
+ return this.__nestScope(new GlobalScope(this, node));
+ }
+
+ __nestBlockScope(node) {
+ return this.__nestScope(new BlockScope(this, this.__currentScope, node));
+ }
+
+ __nestFunctionScope(node, isMethodDefinition) {
+ return this.__nestScope(new FunctionScope(this, this.__currentScope, node, isMethodDefinition));
+ }
+
+ __nestForScope(node) {
+ return this.__nestScope(new ForScope(this, this.__currentScope, node));
+ }
+
+ __nestCatchScope(node) {
+ return this.__nestScope(new CatchScope(this, this.__currentScope, node));
+ }
+
+ __nestWithScope(node) {
+ return this.__nestScope(new WithScope(this, this.__currentScope, node));
+ }
+
+ __nestClassScope(node) {
+ return this.__nestScope(new ClassScope(this, this.__currentScope, node));
+ }
+
+ __nestSwitchScope(node) {
+ return this.__nestScope(new SwitchScope(this, this.__currentScope, node));
+ }
+
+ __nestModuleScope(node) {
+ return this.__nestScope(new ModuleScope(this, this.__currentScope, node));
+ }
+
+ __nestFunctionExpressionNameScope(node) {
+ return this.__nestScope(new FunctionExpressionNameScope(this, this.__currentScope, node));
+ }
+
+ __isES6() {
+ return this.__options.ecmaVersion >= 6;
+ }
+}
+
+module.exports = ScopeManager;
+
+/* vim: set sw=4 ts=4 et tw=80 : */
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