diff options
Diffstat (limited to 'node_modules/tslint/lib/rules/noDuplicateVariableRule.js')
-rw-r--r-- | node_modules/tslint/lib/rules/noDuplicateVariableRule.js | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/node_modules/tslint/lib/rules/noDuplicateVariableRule.js b/node_modules/tslint/lib/rules/noDuplicateVariableRule.js new file mode 100644 index 000000000..c828bfbff --- /dev/null +++ b/node_modules/tslint/lib/rules/noDuplicateVariableRule.js @@ -0,0 +1,87 @@ +"use strict"; +/** + * @license + * Copyright 2013 Palantir Technologies, Inc. + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +Object.defineProperty(exports, "__esModule", { value: true }); +var tslib_1 = require("tslib"); +var utils = require("tsutils"); +var ts = require("typescript"); +var Lint = require("../index"); +var Rule = (function (_super) { + tslib_1.__extends(Rule, _super); + function Rule() { + return _super !== null && _super.apply(this, arguments) || this; + } + /* tslint:enable:object-literal-sort-keys */ + Rule.FAILURE_STRING = function (name) { + return "Duplicate variable: '" + name + "'"; + }; + Rule.prototype.apply = function (sourceFile) { + return this.applyWithFunction(sourceFile, walk); + }; + return Rule; +}(Lint.Rules.AbstractRule)); +/* tslint:disable:object-literal-sort-keys */ +Rule.metadata = { + ruleName: "no-duplicate-variable", + description: "Disallows duplicate variable declarations in the same block scope.", + descriptionDetails: (_a = ["\n This rule is only useful when using the `var` keyword -\n the compiler will detect redeclarations of `let` and `const` variables."], _a.raw = ["\n This rule is only useful when using the \\`var\\` keyword -\n the compiler will detect redeclarations of \\`let\\` and \\`const\\` variables."], Lint.Utils.dedent(_a)), + rationale: (_b = ["\n A variable can be reassigned if necessary -\n there's no good reason to have a duplicate variable declaration."], _b.raw = ["\n A variable can be reassigned if necessary -\n there's no good reason to have a duplicate variable declaration."], Lint.Utils.dedent(_b)), + optionsDescription: "Not configurable.", + options: null, + optionExamples: [true], + type: "functionality", + typescriptOnly: false, +}; +exports.Rule = Rule; +function walk(ctx) { + var scope = new Set(); + return ts.forEachChild(ctx.sourceFile, function cb(node) { + if (utils.isFunctionScopeBoundary(node)) { + var oldScope = scope; + scope = new Set(); + ts.forEachChild(node, cb); + scope = oldScope; + return; + } + else if (utils.isVariableDeclaration(node) && !utils.isBlockScopedVariableDeclaration(node)) { + forEachBoundIdentifier(node.name, function (id) { + var text = id.text; + if (scope.has(text)) { + ctx.addFailureAtNode(id, Rule.FAILURE_STRING(text)); + } + else { + scope.add(text); + } + }); + } + return ts.forEachChild(node, cb); + }); +} +function forEachBoundIdentifier(name, action) { + if (name.kind === ts.SyntaxKind.Identifier) { + action(name); + } + else { + for (var _i = 0, _a = name.elements; _i < _a.length; _i++) { + var e = _a[_i]; + if (e.kind !== ts.SyntaxKind.OmittedExpression) { + forEachBoundIdentifier(e.name, action); + } + } + } +} +var _a, _b; |