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/**
* @fileoverview Rule to flag use of an empty block statement
* @author Nicholas C. Zakas
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const astUtils = require("../ast-utils");
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
docs: {
description: "disallow empty block statements",
category: "Possible Errors",
recommended: true
},
schema: [
{
type: "object",
properties: {
allowEmptyCatch: {
type: "boolean"
}
},
additionalProperties: false
}
]
},
create(context) {
const options = context.options[0] || {},
allowEmptyCatch = options.allowEmptyCatch || false;
const sourceCode = context.getSourceCode();
return {
BlockStatement(node) {
// if the body is not empty, we can just return immediately
if (node.body.length !== 0) {
return;
}
// a function is generally allowed to be empty
if (astUtils.isFunction(node.parent)) {
return;
}
if (allowEmptyCatch && node.parent.type === "CatchClause") {
return;
}
// any other block is only allowed to be empty, if it contains a comment
if (sourceCode.getCommentsInside(node).length > 0) {
return;
}
context.report({ node, message: "Empty block statement." });
},
SwitchStatement(node) {
if (typeof node.cases === "undefined" || node.cases.length === 0) {
context.report({ node, message: "Empty switch statement." });
}
}
};
}
};
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