node/tools/eslint/node_modules/escope/lib/scope-manager.js

'use strict';

var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }(); /*
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>

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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           documentation and/or other materials provided with the distribution.

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Object.defineProperty(exports, "__esModule", {
    value: true
});

var _es6WeakMap = require('es6-weak-map');

var _es6WeakMap2 = _interopRequireDefault(_es6WeakMap);

var _scope = require('./scope');

var _scope2 = _interopRequireDefault(_scope);

var _assert = require('assert');

var _assert2 = _interopRequireDefault(_assert);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

/**
 * @class ScopeManager
 */

var ScopeManager = function () {
    function ScopeManager(options) {
        _classCallCheck(this, ScopeManager);

        this.scopes = [];
        this.globalScope = null;
        this.__nodeToScope = new _es6WeakMap2.default();
        this.__currentScope = null;
        this.__options = options;
        this.__declaredVariables = new _es6WeakMap2.default();
    }

    _createClass(ScopeManager, [{
        key: '__useDirective',
        value: function __useDirective() {
            return this.__options.directive;
        }
    }, {
        key: '__isOptimistic',
        value: function __isOptimistic() {
            return this.__options.optimistic;
        }
    }, {
        key: '__ignoreEval',
        value: function __ignoreEval() {
            return this.__options.ignoreEval;
        }
    }, {
        key: '__isNodejsScope',
        value: function __isNodejsScope() {
            return this.__options.nodejsScope;
        }
    }, {
        key: 'isModule',
        value: function isModule() {
            return this.__options.sourceType === 'module';
        }
    }, {
        key: 'isImpliedStrict',
        value: function isImpliedStrict() {
            return this.__options.impliedStrict;
        }
    }, {
        key: 'isStrictModeSupported',
        value: function isStrictModeSupported() {
            return this.__options.ecmaVersion >= 5;
        }

        // Returns appropriate scope for this node.

    }, {
        key: '__get',
        value: function __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 {Esprima.Node} node - a node to get.
         * @returns {Variable[]} variables that declared by the node.
         */

    }, {
        key: 'getDeclaredVariables',
        value: function getDeclaredVariables(node) {
            return this.__declaredVariables.get(node) || [];
        }

        /**
         * acquire scope from node.
         * @method ScopeManager#acquire
         * @param {Esprima.Node} node - node for the acquired scope.
         * @param {boolean=} inner - look up the most inner scope, default value is false.
         * @return {Scope?}
         */

    }, {
        key: 'acquire',
        value: function acquire(node, inner) {
            var scopes, scope, i, iz;

            function predicate(scope) {
                if (scope.type === 'function' && scope.functionExpressionScope) {
                    return false;
                }
                if (scope.type === 'TDZ') {
                    return false;
                }
                return true;
            }

            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 (i = scopes.length - 1; i >= 0; --i) {
                    scope = scopes[i];
                    if (predicate(scope)) {
                        return scope;
                    }
                }
            } else {
                for (i = 0, iz = scopes.length; i < iz; ++i) {
                    scope = scopes[i];
                    if (predicate(scope)) {
                        return scope;
                    }
                }
            }

            return null;
        }

        /**
         * acquire all scopes from node.
         * @method ScopeManager#acquireAll
         * @param {Esprima.Node} node - node for the acquired scope.
         * @return {Scope[]?}
         */

    }, {
        key: 'acquireAll',
        value: function acquireAll(node) {
            return this.__get(node);
        }

        /**
         * release the node.
         * @method ScopeManager#release
         * @param {Esprima.Node} node - releasing node.
         * @param {boolean=} inner - look up the most inner scope, default value is false.
         * @return {Scope?} upper scope for the node.
         */

    }, {
        key: 'release',
        value: function release(node, inner) {
            var scopes, scope;
            scopes = this.__get(node);
            if (scopes && scopes.length) {
                scope = scopes[0].upper;
                if (!scope) {
                    return null;
                }
                return this.acquire(scope.block, inner);
            }
            return null;
        }
    }, {
        key: 'attach',
        value: function attach() {}
    }, {
        key: 'detach',
        value: function detach() {}
    }, {
        key: '__nestScope',
        value: function __nestScope(scope) {
            if (scope instanceof _scope.GlobalScope) {
                (0, _assert2.default)(this.__currentScope === null);
                this.globalScope = scope;
            }
            this.__currentScope = scope;
            return scope;
        }
    }, {
        key: '__nestGlobalScope',
        value: function __nestGlobalScope(node) {
            return this.__nestScope(new _scope.GlobalScope(this, node));
        }
    }, {
        key: '__nestBlockScope',
        value: function __nestBlockScope(node, isMethodDefinition) {
            return this.__nestScope(new _scope.BlockScope(this, this.__currentScope, node));
        }
    }, {
        key: '__nestFunctionScope',
        value: function __nestFunctionScope(node, isMethodDefinition) {
            return this.__nestScope(new _scope.FunctionScope(this, this.__currentScope, node, isMethodDefinition));
        }
    }, {
        key: '__nestForScope',
        value: function __nestForScope(node) {
            return this.__nestScope(new _scope.ForScope(this, this.__currentScope, node));
        }
    }, {
        key: '__nestCatchScope',
        value: function __nestCatchScope(node) {
            return this.__nestScope(new _scope.CatchScope(this, this.__currentScope, node));
        }
    }, {
        key: '__nestWithScope',
        value: function __nestWithScope(node) {
            return this.__nestScope(new _scope.WithScope(this, this.__currentScope, node));
        }
    }, {
        key: '__nestClassScope',
        value: function __nestClassScope(node) {
            return this.__nestScope(new _scope.ClassScope(this, this.__currentScope, node));
        }
    }, {
        key: '__nestSwitchScope',
        value: function __nestSwitchScope(node) {
            return this.__nestScope(new _scope.SwitchScope(this, this.__currentScope, node));
        }
    }, {
        key: '__nestModuleScope',
        value: function __nestModuleScope(node) {
            return this.__nestScope(new _scope.ModuleScope(this, this.__currentScope, node));
        }
    }, {
        key: '__nestTDZScope',
        value: function __nestTDZScope(node) {
            return this.__nestScope(new _scope.TDZScope(this, this.__currentScope, node));
        }
    }, {
        key: '__nestFunctionExpressionNameScope',
        value: function __nestFunctionExpressionNameScope(node) {
            return this.__nestScope(new _scope.FunctionExpressionNameScope(this, this.__currentScope, node));
        }
    }, {
        key: '__isES6',
        value: function __isES6() {
            return this.__options.ecmaVersion >= 6;
        }
    }]);

    return ScopeManager;
}();

/* vim: set sw=4 ts=4 et tw=80 : */

exports.default = ScopeManager;
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