.

qwen/nodejs/node_modules/eslint-scope/lib/scope-manager.js

@@ -0,0 +1,255 @@
+/*
+  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.
+*/
+
+/* eslint-disable no-underscore-dangle */
+
+import {
+    BlockScope,
+    CatchScope,
+    ClassFieldInitializerScope,
+    ClassStaticBlockScope,
+    ClassScope,
+    ForScope,
+    FunctionExpressionNameScope,
+    FunctionScope,
+    GlobalScope,
+    ModuleScope,
+    SwitchScope,
+    WithScope
+} from "./scope.js";
+import assert from "assert";
+
+/**
+ * @constructor 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;
+    }
+
+    isGlobalReturn() {
+        return this.__options.nodejsScope || this.__options.sourceType === "commonjs";
+    }
+
+    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.
+     * @function ScopeManager#acquire
+     * @param {Espree.Node} node node for the acquired scope.
+     * @param {?boolean} [inner=false] 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.
+     * @function ScopeManager#acquireAll
+     * @param {Espree.Node} node node for the acquired scope.
+     * @returns {Scopes?} Scope array
+     */
+    acquireAll(node) {
+        return this.__get(node);
+    }
+
+    /**
+     * release the node.
+     * @function ScopeManager#release
+     * @param {Espree.Node} node releasing node.
+     * @param {?boolean} [inner=false] 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));
+    }
+
+    __nestClassFieldInitializerScope(node) {
+        return this.__nestScope(new ClassFieldInitializerScope(this, this.__currentScope, node));
+    }
+
+    __nestClassStaticBlockScope(node) {
+        return this.__nestScope(new ClassStaticBlockScope(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;
+    }
+}
+
+export default ScopeManager;
+
+/* vim: set sw=4 ts=4 et tw=80 : */