91 lines
5.1 KiB
JavaScript
91 lines
5.1 KiB
JavaScript
"use strict";
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/**
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* @license
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* Copyright 2013 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 utils = 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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/* tslint:enable:object-literal-sort-keys */
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Rule.FAILURE_STRING = function (keyword) {
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return "expected a 'break' before '" + ts.tokenToString(keyword) + "'";
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};
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Rule.prototype.apply = function (sourceFile) {
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return this.applyWithWalker(new NoSwitchCaseFallThroughWalker(sourceFile, this.ruleName, undefined));
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};
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return Rule;
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}(Lint.Rules.AbstractRule));
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/* tslint:disable:object-literal-sort-keys */
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Rule.metadata = {
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ruleName: "no-switch-case-fall-through",
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description: "Disallows falling through case statements.",
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descriptionDetails: (_a = ["\n For example, the following is not allowed:\n\n ```ts\n switch(foo) {\n case 1:\n someFunc(foo);\n case 2:\n someOtherFunc(foo);\n }\n ```\n\n However, fall through is allowed when case statements are consecutive or\n a magic `/* falls through */` comment is present. The following is valid:\n\n ```ts\n switch(foo) {\n case 1:\n someFunc(foo);\n /* falls through */\n case 2:\n case 3:\n someOtherFunc(foo);\n }\n ```"], _a.raw = ["\n For example, the following is not allowed:\n\n \\`\\`\\`ts\n switch(foo) {\n case 1:\n someFunc(foo);\n case 2:\n someOtherFunc(foo);\n }\n \\`\\`\\`\n\n However, fall through is allowed when case statements are consecutive or\n a magic \\`/* falls through */\\` comment is present. The following is valid:\n\n \\`\\`\\`ts\n switch(foo) {\n case 1:\n someFunc(foo);\n /* falls through */\n case 2:\n case 3:\n someOtherFunc(foo);\n }\n \\`\\`\\`"], Lint.Utils.dedent(_a)),
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rationale: "Fall though in switch statements is often unintentional and a bug.",
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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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exports.Rule = Rule;
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var NoSwitchCaseFallThroughWalker = (function (_super) {
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tslib_1.__extends(NoSwitchCaseFallThroughWalker, _super);
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function NoSwitchCaseFallThroughWalker() {
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return _super !== null && _super.apply(this, arguments) || this;
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}
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NoSwitchCaseFallThroughWalker.prototype.walk = function (sourceFile) {
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var _this = this;
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var cb = function (node) {
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if (utils.isSwitchStatement(node)) {
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_this.visitSwitchStatement(node);
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}
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return ts.forEachChild(node, cb);
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};
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return ts.forEachChild(sourceFile, cb);
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};
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NoSwitchCaseFallThroughWalker.prototype.visitSwitchStatement = function (_a) {
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var _this = this;
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var clauses = _a.caseBlock.clauses;
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clauses.forEach(function (clause, i) {
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if (i !== clauses.length - 1
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&& clause.statements.length !== 0
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&& !utils.endsControlFlow(clause)
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&& !_this.isFallThroughAllowed(clause)) {
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var keyword = clauses[i + 1].getChildAt(0);
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_this.addFailureAtNode(keyword, Rule.FAILURE_STRING(keyword.kind));
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}
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});
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};
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NoSwitchCaseFallThroughWalker.prototype.isFallThroughAllowed = function (clause) {
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var _this = this;
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var comments = ts.getLeadingCommentRanges(this.sourceFile.text, clause.end);
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return comments !== undefined && comments.some(function (comment) { return commentText(comment, _this.sourceFile).trim() === "falls through"; });
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};
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return NoSwitchCaseFallThroughWalker;
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}(Lint.AbstractWalker));
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exports.NoSwitchCaseFallThroughWalker = NoSwitchCaseFallThroughWalker;
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function commentText(_a, sourceFile) {
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var pos = _a.pos, end = _a.end, kind = _a.kind;
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return sourceFile.text.slice(pos + 2, kind === ts.SyntaxKind.MultiLineCommentTrivia ? end - 2 : end);
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}
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var _a;
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