119 lines
4.6 KiB
JavaScript
119 lines
4.6 KiB
JavaScript
"use strict";
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/**
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* @license
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* Copyright 2015 Palantir Technologies, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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Object.defineProperty(exports, "__esModule", { value: true });
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var tslib_1 = require("tslib");
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var tsutils_1 = require("tsutils");
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var ts = require("typescript");
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var Lint = require("../index");
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var Rule = /** @class */ (function (_super) {
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tslib_1.__extends(Rule, _super);
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function Rule() {
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return _super !== null && _super.apply(this, arguments) || this;
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}
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Rule.prototype.apply = function (sourceFile) {
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return this.applyWithFunction(sourceFile, walk);
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};
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/* tslint:disable:object-literal-sort-keys */
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Rule.metadata = {
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ruleName: "no-conditional-assignment",
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description: "Disallows any type of assignment in conditionals.",
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descriptionDetails: "This applies to `do-while`, `for`, `if`, and `while` statements and conditional (ternary) expressions.",
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rationale: (_a = ["\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."], _a.raw = ["\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."], Lint.Utils.dedent(_a)),
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optionsDescription: "Not configurable.",
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options: null,
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optionExamples: [true],
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type: "functionality",
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typescriptOnly: false,
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};
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/* tslint:enable:object-literal-sort-keys */
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Rule.FAILURE_STRING = "Assignments in conditional expressions are forbidden";
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return Rule;
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}(Lint.Rules.AbstractRule));
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exports.Rule = Rule;
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function walk(ctx) {
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var checking = 0;
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return ts.forEachChild(ctx.sourceFile, cb);
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function cb(node) {
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var kind = node.kind;
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if (!tsutils_1.isNodeKind(kind)) {
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return; // return early for tokens
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}
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switch (kind) {
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case ts.SyntaxKind.ConditionalExpression:
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check(node.condition);
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cb(node.whenTrue);
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cb(node.whenFalse);
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return;
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case ts.SyntaxKind.IfStatement:
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check(node.expression);
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cb(node.thenStatement);
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maybeCallback(cb, node.elseStatement);
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return;
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case ts.SyntaxKind.DoStatement:
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case ts.SyntaxKind.WhileStatement:
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check(node.expression);
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cb(node.statement);
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return;
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case ts.SyntaxKind.ForStatement:
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maybeCallback(cb, node.initializer);
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maybeCallback(check, node.condition);
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maybeCallback(cb, node.incrementor);
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cb(node.statement);
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return;
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}
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if (checking !== 0) {
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switch (kind) {
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case ts.SyntaxKind.BinaryExpression:
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if (tsutils_1.isAssignmentKind(node.operatorToken.kind)) {
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ctx.addFailureAtNode(node, Rule.FAILURE_STRING);
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}
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cb(node.left);
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cb(node.right);
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return;
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case ts.SyntaxKind.ParenthesizedExpression:
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case ts.SyntaxKind.NonNullExpression:
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case ts.SyntaxKind.AsExpression:
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case ts.SyntaxKind.TypeAssertionExpression:
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return cb(node.expression);
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case ts.SyntaxKind.PrefixUnaryExpression:
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return cb(node.operand);
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default:
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return noCheck(node);
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}
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}
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return ts.forEachChild(node, cb);
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}
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function check(node) {
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++checking;
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cb(node);
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--checking;
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}
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function noCheck(node) {
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var old = checking;
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checking = 0;
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ts.forEachChild(node, cb);
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checking = old;
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}
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}
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function maybeCallback(cb, node) {
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if (node !== undefined) {
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cb(node);
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}
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}
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var _a;
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