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Diffstat (limited to 'node_modules/escope/src/scope-manager.js')
| -rw-r--r-- | node_modules/escope/src/scope-manager.js | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/node_modules/escope/src/scope-manager.js b/node_modules/escope/src/scope-manager.js new file mode 100644 index 000000000..024535d7c --- /dev/null +++ b/node_modules/escope/src/scope-manager.js @@ -0,0 +1,245 @@ +/* + 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. +*/ + +import WeakMap from 'es6-weak-map'; +import Scope from './scope'; +import assert from 'assert'; + +import { + GlobalScope, + CatchScope, + WithScope, + ModuleScope, + ClassScope, + SwitchScope, + FunctionScope, + ForScope, + TDZScope, + FunctionExpressionNameScope, + BlockScope +} from './scope'; + +/** + * @class ScopeManager + */ +export default 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 {Esprima.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 {Esprima.Node} node - node for the acquired scope. + * @param {boolean=} inner - look up the most inner scope, default value is false. + * @return {Scope?} + */ + 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[]?} + */ + 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. + */ + 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; + } + + attach() { } + + detach() { } + + __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, isMethodDefinition) { + 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)); + } + + __nestTDZScope(node) { + return this.__nestScope(new TDZScope(this, this.__currentScope, node)); + } + + __nestFunctionExpressionNameScope(node) { + return this.__nestScope(new FunctionExpressionNameScope(this, this.__currentScope, node)); + } + + __isES6() { + return this.__options.ecmaVersion >= 6; + } +} + +/* vim: set sw=4 ts=4 et tw=80 : */ |