96 lines
4.2 KiB
JavaScript
96 lines
4.2 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 BAN_SINGLE_ARG_PARENS = "ban-single-arg-parens";
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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.apply = function (sourceFile) {
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return this.applyWithFunction(sourceFile, walk, {
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banSingleArgParens: this.ruleArguments.indexOf(BAN_SINGLE_ARG_PARENS) !== -1,
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});
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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: "arrow-parens",
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description: "Requires parentheses around the parameters of arrow function definitions.",
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hasFix: true,
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rationale: "Maintains stylistic consistency with other arrow function definitions.",
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optionsDescription: (_a = ["\n If `", "` is specified, then arrow functions with one parameter\n must not have parentheses if removing them is allowed by TypeScript."], _a.raw = ["\n If \\`", "\\` is specified, then arrow functions with one parameter\n must not have parentheses if removing them is allowed by TypeScript."], Lint.Utils.dedent(_a, BAN_SINGLE_ARG_PARENS)),
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options: {
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type: "string",
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enum: [BAN_SINGLE_ARG_PARENS],
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},
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optionExamples: [true, [true, BAN_SINGLE_ARG_PARENS]],
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type: "style",
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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_MISSING = "Parentheses are required around the parameters of an arrow function definition";
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Rule.FAILURE_STRING_EXISTS = "Parentheses are prohibited around the parameter in this single parameter arrow function";
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exports.Rule = Rule;
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function walk(ctx) {
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function cb(node) {
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if (tsutils_1.isArrowFunction(node) && parensAreOptional(node)) {
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var openParen = tsutils_1.getChildOfKind(node, ts.SyntaxKind.OpenParenToken);
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if (openParen === undefined) {
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if (!ctx.options.banSingleArgParens) {
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var parameter = node.parameters[0];
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var start = parameter.getStart(ctx.sourceFile);
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var end = parameter.end;
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ctx.addFailure(start, end, Rule.FAILURE_STRING_MISSING, [
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Lint.Replacement.appendText(start, "("),
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Lint.Replacement.appendText(end, ")"),
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]);
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}
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}
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else if (ctx.options.banSingleArgParens) {
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var closeParen = tsutils_1.getChildOfKind(node, ts.SyntaxKind.CloseParenToken);
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ctx.addFailureAtNode(node.parameters[0], Rule.FAILURE_STRING_EXISTS, [
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Lint.Replacement.deleteText(openParen.end - 1, 1),
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Lint.Replacement.deleteText(closeParen.end - 1, 1),
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]);
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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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return ts.forEachChild(ctx.sourceFile, cb);
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}
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function parensAreOptional(node) {
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return node.parameters.length === 1 &&
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node.typeParameters === undefined &&
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node.type === undefined &&
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isSimpleParameter(node.parameters[0]);
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}
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function isSimpleParameter(parameter) {
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return parameter.name.kind === ts.SyntaxKind.Identifier
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&& parameter.dotDotDotToken === undefined
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&& parameter.initializer === undefined
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&& parameter.questionToken === undefined
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&& parameter.type === undefined;
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}
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var _a;
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