source: trip-planner-front/node_modules/eslint-scope/lib/scope-manager.js

Last change on this file was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

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1/*
2 Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>
3
4 Redistribution and use in source and binary forms, with or without
5 modification, are permitted provided that the following conditions are met:
6
7 * Redistributions of source code must retain the above copyright
8 notice, this list of conditions and the following disclaimer.
9 * Redistributions in binary form must reproduce the above copyright
10 notice, this list of conditions and the following disclaimer in the
11 documentation and/or other materials provided with the distribution.
12
13 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
14 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
17 DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
18 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
19 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
20 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23*/
24"use strict";
25
26/* eslint-disable no-underscore-dangle */
27
28const Scope = require("./scope");
29const assert = require("assert");
30
31const GlobalScope = Scope.GlobalScope;
32const CatchScope = Scope.CatchScope;
33const WithScope = Scope.WithScope;
34const ModuleScope = Scope.ModuleScope;
35const ClassScope = Scope.ClassScope;
36const SwitchScope = Scope.SwitchScope;
37const FunctionScope = Scope.FunctionScope;
38const ForScope = Scope.ForScope;
39const FunctionExpressionNameScope = Scope.FunctionExpressionNameScope;
40const BlockScope = Scope.BlockScope;
41
42/**
43 * @class ScopeManager
44 */
45class ScopeManager {
46 constructor(options) {
47 this.scopes = [];
48 this.globalScope = null;
49 this.__nodeToScope = new WeakMap();
50 this.__currentScope = null;
51 this.__options = options;
52 this.__declaredVariables = new WeakMap();
53 }
54
55 __useDirective() {
56 return this.__options.directive;
57 }
58
59 __isOptimistic() {
60 return this.__options.optimistic;
61 }
62
63 __ignoreEval() {
64 return this.__options.ignoreEval;
65 }
66
67 __isNodejsScope() {
68 return this.__options.nodejsScope;
69 }
70
71 isModule() {
72 return this.__options.sourceType === "module";
73 }
74
75 isImpliedStrict() {
76 return this.__options.impliedStrict;
77 }
78
79 isStrictModeSupported() {
80 return this.__options.ecmaVersion >= 5;
81 }
82
83 // Returns appropriate scope for this node.
84 __get(node) {
85 return this.__nodeToScope.get(node);
86 }
87
88 /**
89 * Get variables that are declared by the node.
90 *
91 * "are declared by the node" means the node is same as `Variable.defs[].node` or `Variable.defs[].parent`.
92 * If the node declares nothing, this method returns an empty array.
93 * CAUTION: This API is experimental. See https://github.com/estools/escope/pull/69 for more details.
94 *
95 * @param {Espree.Node} node - a node to get.
96 * @returns {Variable[]} variables that declared by the node.
97 */
98 getDeclaredVariables(node) {
99 return this.__declaredVariables.get(node) || [];
100 }
101
102 /**
103 * acquire scope from node.
104 * @method ScopeManager#acquire
105 * @param {Espree.Node} node - node for the acquired scope.
106 * @param {boolean=} inner - look up the most inner scope, default value is false.
107 * @returns {Scope?} Scope from node
108 */
109 acquire(node, inner) {
110
111 /**
112 * predicate
113 * @param {Scope} testScope - scope to test
114 * @returns {boolean} predicate
115 */
116 function predicate(testScope) {
117 if (testScope.type === "function" && testScope.functionExpressionScope) {
118 return false;
119 }
120 return true;
121 }
122
123 const scopes = this.__get(node);
124
125 if (!scopes || scopes.length === 0) {
126 return null;
127 }
128
129 // Heuristic selection from all scopes.
130 // If you would like to get all scopes, please use ScopeManager#acquireAll.
131 if (scopes.length === 1) {
132 return scopes[0];
133 }
134
135 if (inner) {
136 for (let i = scopes.length - 1; i >= 0; --i) {
137 const scope = scopes[i];
138
139 if (predicate(scope)) {
140 return scope;
141 }
142 }
143 } else {
144 for (let i = 0, iz = scopes.length; i < iz; ++i) {
145 const scope = scopes[i];
146
147 if (predicate(scope)) {
148 return scope;
149 }
150 }
151 }
152
153 return null;
154 }
155
156 /**
157 * acquire all scopes from node.
158 * @method ScopeManager#acquireAll
159 * @param {Espree.Node} node - node for the acquired scope.
160 * @returns {Scopes?} Scope array
161 */
162 acquireAll(node) {
163 return this.__get(node);
164 }
165
166 /**
167 * release the node.
168 * @method ScopeManager#release
169 * @param {Espree.Node} node - releasing node.
170 * @param {boolean=} inner - look up the most inner scope, default value is false.
171 * @returns {Scope?} upper scope for the node.
172 */
173 release(node, inner) {
174 const scopes = this.__get(node);
175
176 if (scopes && scopes.length) {
177 const scope = scopes[0].upper;
178
179 if (!scope) {
180 return null;
181 }
182 return this.acquire(scope.block, inner);
183 }
184 return null;
185 }
186
187 attach() { } // eslint-disable-line class-methods-use-this
188
189 detach() { } // eslint-disable-line class-methods-use-this
190
191 __nestScope(scope) {
192 if (scope instanceof GlobalScope) {
193 assert(this.__currentScope === null);
194 this.globalScope = scope;
195 }
196 this.__currentScope = scope;
197 return scope;
198 }
199
200 __nestGlobalScope(node) {
201 return this.__nestScope(new GlobalScope(this, node));
202 }
203
204 __nestBlockScope(node) {
205 return this.__nestScope(new BlockScope(this, this.__currentScope, node));
206 }
207
208 __nestFunctionScope(node, isMethodDefinition) {
209 return this.__nestScope(new FunctionScope(this, this.__currentScope, node, isMethodDefinition));
210 }
211
212 __nestForScope(node) {
213 return this.__nestScope(new ForScope(this, this.__currentScope, node));
214 }
215
216 __nestCatchScope(node) {
217 return this.__nestScope(new CatchScope(this, this.__currentScope, node));
218 }
219
220 __nestWithScope(node) {
221 return this.__nestScope(new WithScope(this, this.__currentScope, node));
222 }
223
224 __nestClassScope(node) {
225 return this.__nestScope(new ClassScope(this, this.__currentScope, node));
226 }
227
228 __nestSwitchScope(node) {
229 return this.__nestScope(new SwitchScope(this, this.__currentScope, node));
230 }
231
232 __nestModuleScope(node) {
233 return this.__nestScope(new ModuleScope(this, this.__currentScope, node));
234 }
235
236 __nestFunctionExpressionNameScope(node) {
237 return this.__nestScope(new FunctionExpressionNameScope(this, this.__currentScope, node));
238 }
239
240 __isES6() {
241 return this.__options.ecmaVersion >= 6;
242 }
243}
244
245module.exports = ScopeManager;
246
247/* vim: set sw=4 ts=4 et tw=80 : */
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