Initial commit (from f5274cbdce4ae7c9e4b937dcdf95ac70ae436d5f)

node_modules/tslint/lib/rules/noDuplicateSwitchCaseRule.js

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+"use strict";
+/**
+ * @license
+ * Copyright 2017 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 ts = require("typescript");
+var Lint = require("../index");
+var Rule = /** @class */ (function (_super) {
+    tslib_1.__extends(Rule, _super);
+    function Rule() {
+        return _super !== null && _super.apply(this, arguments) || this;
+    }
+    Rule.prototype.apply = function (sourceFile) {
+        return this.applyWithFunction(sourceFile, walk);
+    };
+    Rule.metadata = {
+        description: "Prevents duplicate cases in switch statements.",
+        optionExamples: [true],
+        options: null,
+        optionsDescription: "",
+        ruleName: "no-duplicate-switch-case",
+        type: "functionality",
+        typescriptOnly: false,
+    };
+    Rule.FAILURE_STRING_FACTORY = function (text) {
+        return "Duplicate switch case: '" + text + "'.";
+    };
+    return Rule;
+}(Lint.Rules.AbstractRule));
+exports.Rule = Rule;
+function walk(ctx) {
+    ts.forEachChild(ctx.sourceFile, function cb(node) {
+        if (node.kind === ts.SyntaxKind.CaseBlock) {
+            visitCaseBlock(node);
+        }
+        ts.forEachChild(node, cb);
+    });
+    function visitCaseBlock(node) {
+        var previousCases = new Set();
+        for (var _i = 0, _a = node.clauses; _i < _a.length; _i++) {
+            var clause = _a[_i];
+            if (clause.kind === ts.SyntaxKind.DefaultClause) {
+                continue;
+            }
+            var text = clause.expression.getText(ctx.sourceFile);
+            if (!previousCases.has(text)) {
+                previousCases.add(text);
+                continue;
+            }
+            ctx.addFailureAtNode(clause.expression, Rule.FAILURE_STRING_FACTORY(text));
+        }
+    }
+}