Initial commit (from f5274cbdce4ae7c9e4b937dcdf95ac70ae436d5f)

node_modules/tslint/lib/rules/noConditionalAssignmentRule.js

@@ -0,0 +1,118 @@
+"use strict";
+/**
+ * @license
+ * Copyright 2015 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 tsutils_1 = require("tsutils");
+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);
+    };
+    /* tslint:disable:object-literal-sort-keys */
+    Rule.metadata = {
+        ruleName: "no-conditional-assignment",
+        description: "Disallows any type of assignment in conditionals.",
+        descriptionDetails: "This applies to `do-while`, `for`, `if`, and `while` statements and conditional (ternary) expressions.",
+        rationale: Lint.Utils.dedent(templateObject_1 || (templateObject_1 = tslib_1.__makeTemplateObject(["\n            Assignments in conditionals are often typos:\n            for example `if (var1 = var2)` instead of `if (var1 == var2)`.\n            They also can be an indicator of overly clever code which decreases maintainability."], ["\n            Assignments in conditionals are often typos:\n            for example \\`if (var1 = var2)\\` instead of \\`if (var1 == var2)\\`.\n            They also can be an indicator of overly clever code which decreases maintainability."]))),
+        optionsDescription: "Not configurable.",
+        options: null,
+        optionExamples: [true],
+        type: "functionality",
+        typescriptOnly: false,
+    };
+    /* tslint:enable:object-literal-sort-keys */
+    Rule.FAILURE_STRING = "Assignments in conditional expressions are forbidden";
+    return Rule;
+}(Lint.Rules.AbstractRule));
+exports.Rule = Rule;
+function walk(ctx) {
+    var checking = 0;
+    return ts.forEachChild(ctx.sourceFile, cb);
+    function cb(node) {
+        var kind = node.kind;
+        if (!tsutils_1.isNodeKind(kind)) {
+            return; // return early for tokens
+        }
+        switch (kind) {
+            case ts.SyntaxKind.ConditionalExpression:
+                check(node.condition);
+                cb(node.whenTrue);
+                cb(node.whenFalse);
+                return;
+            case ts.SyntaxKind.IfStatement:
+                check(node.expression);
+                cb(node.thenStatement);
+                maybeCallback(cb, node.elseStatement);
+                return;
+            case ts.SyntaxKind.DoStatement:
+            case ts.SyntaxKind.WhileStatement:
+                check(node.expression);
+                cb(node.statement);
+                return;
+            case ts.SyntaxKind.ForStatement:
+                maybeCallback(cb, node.initializer);
+                maybeCallback(check, node.condition);
+                maybeCallback(cb, node.incrementor);
+                cb(node.statement);
+                return;
+        }
+        if (checking !== 0) {
+            switch (kind) {
+                case ts.SyntaxKind.BinaryExpression:
+                    if (tsutils_1.isAssignmentKind(node.operatorToken.kind)) {
+                        ctx.addFailureAtNode(node, Rule.FAILURE_STRING);
+                    }
+                    cb(node.left);
+                    cb(node.right);
+                    return;
+                case ts.SyntaxKind.ParenthesizedExpression:
+                case ts.SyntaxKind.NonNullExpression:
+                case ts.SyntaxKind.AsExpression:
+                case ts.SyntaxKind.TypeAssertionExpression:
+                    return cb(node.expression);
+                case ts.SyntaxKind.PrefixUnaryExpression:
+                    return cb(node.operand);
+                default:
+                    return noCheck(node);
+            }
+        }
+        return ts.forEachChild(node, cb);
+    }
+    function check(node) {
+        ++checking;
+        cb(node);
+        --checking;
+    }
+    function noCheck(node) {
+        var old = checking;
+        checking = 0;
+        ts.forEachChild(node, cb);
+        checking = old;
+    }
+}
+function maybeCallback(cb, node) {
+    if (node !== undefined) {
+        cb(node);
+    }
+}
+var templateObject_1;