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/**
* @fileoverview Rule to require parens in arrow function arguments.
* @author Jxck
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
docs: {
description: "require parentheses around arrow function arguments",
category: "ECMAScript 6",
recommended: false
},
fixable: "code",
schema: [
{
enum: ["always", "as-needed"]
}
]
},
create: function(context) {
let message = "Expected parentheses around arrow function argument.";
let asNeededMessage = "Unexpected parentheses around single function argument.";
let asNeeded = context.options[0] === "as-needed";
let sourceCode = context.getSourceCode();
/**
* Determines whether a arrow function argument end with `)`
* @param {ASTNode} node The arrow function node.
* @returns {void}
*/
function parens(node) {
let token = sourceCode.getFirstToken(node);
// as-needed: x => x
if (asNeeded && node.params.length === 1 && node.params[0].type === "Identifier") {
if (token.type === "Punctuator" && token.value === "(") {
context.report({
node: node,
message: asNeededMessage,
fix: function(fixer) {
let paramToken = context.getTokenAfter(token);
let closingParenToken = context.getTokenAfter(paramToken);
return fixer.replaceTextRange([
token.range[0],
closingParenToken.range[1]
], paramToken.value);
}
});
}
return;
}
if (token.type === "Identifier") {
let after = sourceCode.getTokenAfter(token);
// (x) => x
if (after.value !== ")") {
context.report({
node: node,
message: message,
fix: function(fixer) {
return fixer.replaceText(token, "(" + token.value + ")");
}
});
}
}
}
return {
ArrowFunctionExpression: parens
};
}
};
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