Initial commit (from f5274cbdce4ae7c9e4b937dcdf95ac70ae436d5f)

node_modules/tslint/lib/rules/arrowParensRule.js

@@ -0,0 +1,97 @@
+"use strict";
+/**
+ * @license
+ * Copyright 2018 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.
+ */
+Object.defineProperty(exports, "__esModule", { value: true });
+var tslib_1 = require("tslib");
+var tsutils_1 = require("tsutils");
+var ts = require("typescript");
+var Lint = require("../index");
+var BAN_SINGLE_ARG_PARENS = "ban-single-arg-parens";
+var Rule = /** @class */ (function (_super) {
+    tslib_1.__extends(Rule, _super);
+    function Rule() {
+        return _super !== null && _super.apply(this, arguments) || this;
+    }
+    Rule.prototype.apply = function (sourceFile) {
+        return this.applyWithFunction(sourceFile, walk, {
+            banSingleArgParens: this.ruleArguments.indexOf(BAN_SINGLE_ARG_PARENS) !== -1,
+        });
+    };
+    /* tslint:disable:object-literal-sort-keys */
+    Rule.metadata = {
+        ruleName: "arrow-parens",
+        description: "Requires parentheses around the parameters of arrow function definitions.",
+        hasFix: true,
+        rationale: "Maintains stylistic consistency with other arrow function definitions.",
+        optionsDescription: Lint.Utils.dedent(templateObject_1 || (templateObject_1 = tslib_1.__makeTemplateObject(["\n            If `", "` is specified, then arrow functions with one parameter\n            must not have parentheses if removing them is allowed by TypeScript."], ["\n            If \\`", "\\` is specified, then arrow functions with one parameter\n            must not have parentheses if removing them is allowed by TypeScript."])), BAN_SINGLE_ARG_PARENS),
+        options: {
+            type: "string",
+            enum: [BAN_SINGLE_ARG_PARENS],
+        },
+        optionExamples: [true, [true, BAN_SINGLE_ARG_PARENS]],
+        type: "formatting",
+        typescriptOnly: false,
+    };
+    /* tslint:enable:object-literal-sort-keys */
+    Rule.FAILURE_STRING_MISSING = "Parentheses are required around the parameters of an arrow function definition";
+    Rule.FAILURE_STRING_EXISTS = "Parentheses are prohibited around the parameter in this single parameter arrow function";
+    return Rule;
+}(Lint.Rules.AbstractRule));
+exports.Rule = Rule;
+function walk(ctx) {
+    function cb(node) {
+        if (tsutils_1.isArrowFunction(node) && parensAreOptional(node)) {
+            var openParen = tsutils_1.getChildOfKind(node, ts.SyntaxKind.OpenParenToken);
+            if (openParen === undefined) {
+                if (!ctx.options.banSingleArgParens) {
+                    var parameter = node.parameters[0];
+                    var start = parameter.getStart(ctx.sourceFile);
+                    var end = parameter.end;
+                    ctx.addFailure(start, end, Rule.FAILURE_STRING_MISSING, [
+                        Lint.Replacement.appendText(start, "("),
+                        Lint.Replacement.appendText(end, ")"),
+                    ]);
+                }
+            }
+            else if (ctx.options.banSingleArgParens) {
+                var closeParen = tsutils_1.getChildOfKind(node, ts.SyntaxKind.CloseParenToken);
+                var charBeforeOpenParen = ctx.sourceFile.text.substring(openParen.pos - 1, openParen.pos);
+                var replaceValue = charBeforeOpenParen.match(/[a-z]/i) !== null ? " " : "";
+                ctx.addFailureAtNode(node.parameters[0], Rule.FAILURE_STRING_EXISTS, [
+                    Lint.Replacement.replaceFromTo(openParen.pos, node.parameters[0].getStart(ctx.sourceFile), replaceValue),
+                    Lint.Replacement.deleteFromTo(node.parameters[0].end, closeParen.end),
+                ]);
+            }
+        }
+        return ts.forEachChild(node, cb);
+    }
+    return ts.forEachChild(ctx.sourceFile, cb);
+}
+function parensAreOptional(node) {
+    return (node.parameters.length === 1 &&
+        node.typeParameters === undefined &&
+        node.type === undefined &&
+        isSimpleParameter(node.parameters[0]));
+}
+function isSimpleParameter(parameter) {
+    return (parameter.name.kind === ts.SyntaxKind.Identifier &&
+        parameter.dotDotDotToken === undefined &&
+        parameter.initializer === undefined &&
+        parameter.questionToken === undefined &&
+        parameter.type === undefined);
+}
+var templateObject_1;