80 lines
3.3 KiB
JavaScript
80 lines
3.3 KiB
JavaScript
"use strict";
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/**
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* @license
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* Copyright 2016 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 = (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.applyWithProgram = function (sourceFile, program) {
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return this.applyWithFunction(sourceFile, function (ctx) { return walk(ctx, program); });
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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: "restrict-plus-operands",
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description: "When adding two variables, operands must both be of type number or of type string.",
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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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requiresTypeInfo: true,
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};
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/* tslint:enable:object-literal-sort-keys */
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Rule.INVALID_TYPES_ERROR = "Operands of '+' operation must either be both strings or both numbers";
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return Rule;
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}(Lint.Rules.TypedRule));
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exports.Rule = Rule;
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function walk(ctx, program) {
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return ts.forEachChild(ctx.sourceFile, function cb(node) {
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if (tsutils_1.isBinaryExpression(node) && node.operatorToken.kind === ts.SyntaxKind.PlusToken) {
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var tc = program.getTypeChecker();
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var leftType = getBaseTypeOfLiteralType(tc.getTypeAtLocation(node.left));
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var rightType = getBaseTypeOfLiteralType(tc.getTypeAtLocation(node.right));
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if (leftType === "invalid" || rightType === "invalid" || leftType !== rightType) {
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return ctx.addFailureAtNode(node, Rule.INVALID_TYPES_ERROR);
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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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}
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function getBaseTypeOfLiteralType(type) {
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if (Lint.isTypeFlagSet(type, ts.TypeFlags.StringLiteral) || Lint.isTypeFlagSet(type, ts.TypeFlags.String)) {
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return "string";
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}
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else if (Lint.isTypeFlagSet(type, ts.TypeFlags.NumberLiteral) || Lint.isTypeFlagSet(type, ts.TypeFlags.Number)) {
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return "number";
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}
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else if (tsutils_1.isUnionType(type) && !Lint.isTypeFlagSet(type, ts.TypeFlags.Enum)) {
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var types = type.types.map(getBaseTypeOfLiteralType);
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return allSame(types) ? types[0] : "invalid";
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}
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else if (Lint.isTypeFlagSet(type, ts.TypeFlags.EnumLiteral)) {
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// Compatibility for TypeScript pre-2.4, which used EnumLiteralType instead of LiteralType
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getBaseTypeOfLiteralType(type.baseType);
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}
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return "invalid";
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}
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function allSame(array) {
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return array.every(function (value) { return value === array[0]; });
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}
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