+++ /dev/null
-"use strict";
-Object.defineProperty(exports, "__esModule", { value: true });
-var tslib_1 = require("tslib");
-var _a, _b;
-/**
- * @license
- * Copyright 2019 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.
- */
-var utils = require("tsutils");
-var ts = require("typescript");
-var Lint = require("../index");
-var unnecessaryElse_examples_1 = require("./code-examples/unnecessaryElse.examples");
-var OPTION_ALLOW_ELSE_IF = "allow-else-if";
-var Rule = /** @class */ (function (_super) {
- tslib_1.__extends(Rule, _super);
- function Rule() {
- return _super !== null && _super.apply(this, arguments) || this;
- }
- /* tslint:disable:object-literal-sort-keys */
- Rule.FAILURE_STRING = function (name) {
- return "The preceding `if` block ends with a `" + name + "` statement. This `else` is unnecessary.";
- };
- Rule.prototype.apply = function (sourceFile) {
- return this.applyWithFunction(sourceFile, walk, parseOptions(this.ruleArguments[0]));
- };
- /* tslint:disable:object-literal-sort-keys */
- Rule.metadata = {
- description: Lint.Utils.dedent(templateObject_1 || (templateObject_1 = tslib_1.__makeTemplateObject(["\n Disallows `else` blocks following `if` blocks ending with a `break`, `continue`, `return`, or `throw` statement."], ["\n Disallows \\`else\\` blocks following \\`if\\` blocks ending with a \\`break\\`, \\`continue\\`, \\`return\\`, or \\`throw\\` statement."]))),
- descriptionDetails: "",
- optionExamples: [true, [true, (_a = {}, _a[OPTION_ALLOW_ELSE_IF] = true, _a)]],
- options: {
- type: "object",
- properties: (_b = {},
- _b[OPTION_ALLOW_ELSE_IF] = { type: "boolean" },
- _b),
- },
- optionsDescription: Lint.Utils.dedent(templateObject_2 || (templateObject_2 = tslib_1.__makeTemplateObject(["\n You can optionally specify the option `\"", "\"` to allow \"else if\" statements.\n "], ["\n You can optionally specify the option \\`\"", "\"\\` to allow \"else if\" statements.\n "])), OPTION_ALLOW_ELSE_IF),
- rationale: Lint.Utils.dedent(templateObject_3 || (templateObject_3 = tslib_1.__makeTemplateObject(["\n When an `if` block is guaranteed to exit control flow when entered,\n it is unnecessary to add an `else` statement.\n The contents that would be in the `else` block can be placed after the end of the `if` block."], ["\n When an \\`if\\` block is guaranteed to exit control flow when entered,\n it is unnecessary to add an \\`else\\` statement.\n The contents that would be in the \\`else\\` block can be placed after the end of the \\`if\\` block."]))),
- ruleName: "unnecessary-else",
- type: "style",
- typescriptOnly: false,
- codeExamples: unnecessaryElse_examples_1.codeExamples,
- };
- return Rule;
-}(Lint.Rules.AbstractRule));
-exports.Rule = Rule;
-function parseOptions(option) {
- var _a;
- return tslib_1.__assign((_a = {}, _a[OPTION_ALLOW_ELSE_IF] = false, _a), option);
-}
-function walk(ctx) {
- var ifStatementStack = [];
- function visitIfStatement(node) {
- var jumpStatement = utils.isBlock(node.thenStatement)
- ? getJumpStatement(getLastStatement(node.thenStatement))
- : getJumpStatement(node.thenStatement);
- ifStatementStack.push({ node: node, jumpStatement: jumpStatement });
- if (jumpStatement !== undefined &&
- node.elseStatement !== undefined &&
- !recentStackParentMissingJumpStatement() &&
- (!utils.isIfStatement(node.elseStatement) || !ctx.options[OPTION_ALLOW_ELSE_IF])) {
- var elseKeyword = getPositionOfElseKeyword(node, ts.SyntaxKind.ElseKeyword);
- ctx.addFailureAtNode(elseKeyword, Rule.FAILURE_STRING(jumpStatement));
- }
- ts.forEachChild(node, visitNode);
- ifStatementStack.pop();
- }
- function recentStackParentMissingJumpStatement() {
- if (ifStatementStack.length <= 1) {
- return false;
- }
- for (var i = ifStatementStack.length - 2; i >= 0; i -= 1) {
- var _a = ifStatementStack[i], jumpStatement = _a.jumpStatement, node = _a.node;
- if (node.elseStatement !== ifStatementStack[i + 1].node) {
- return false;
- }
- if (jumpStatement === undefined) {
- return true;
- }
- }
- return false;
- }
- function visitNode(node) {
- if (utils.isIfStatement(node)) {
- visitIfStatement(node);
- }
- else {
- ts.forEachChild(node, visitNode);
- }
- }
- ts.forEachChild(ctx.sourceFile, visitNode);
-}
-function getPositionOfElseKeyword(node, kind) {
- return node.getChildren().filter(function (child) { return child.kind === kind; })[0];
-}
-function getJumpStatement(node) {
- if (node === undefined) {
- return undefined;
- }
- switch (node.kind) {
- case ts.SyntaxKind.BreakStatement:
- return "break";
- case ts.SyntaxKind.ContinueStatement:
- return "continue";
- case ts.SyntaxKind.ThrowStatement:
- return "throw";
- case ts.SyntaxKind.ReturnStatement:
- return "return";
- default:
- return undefined;
- }
-}
-function getLastStatement(clause) {
- var block = clause.statements[0];
- var statements = clause.statements.length === 1 && utils.isBlock(block)
- ? block.statements
- : clause.statements;
- return last(statements);
-}
-function last(arr) {
- return arr[arr.length - 1];
-}
-var templateObject_1, templateObject_2, templateObject_3;
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