max-statements.js
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/**
* @fileoverview A rule to set the maximum number of statements in a function.
* @author Ian Christian Myers
* @copyright 2013 Ian Christian Myers. All rights reserved.
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = function(context) {
//--------------------------------------------------------------------------
// Helpers
//--------------------------------------------------------------------------
var functionStack = [],
maxStatements = context.options[0] || 10;
/**
* When parsing a new function, store it in our function stack
* @returns {void}
* @private
*/
function startFunction() {
functionStack.push(0);
}
/**
* Evaluate the node at the end of function
* @param {ASTNode} node node to evaluate
* @returns {void}
* @private
*/
function endFunction(node) {
var count = functionStack.pop();
if (count > maxStatements) {
context.report(node, "This function has too many statements ({{count}}). Maximum allowed is {{max}}.",
{ count: count, max: maxStatements });
}
}
/**
* Increment the count of the functions
* @param {ASTNode} node node to evaluate
* @returns {void}
* @private
*/
function countStatements(node) {
functionStack[functionStack.length - 1] += node.body.length;
}
//--------------------------------------------------------------------------
// Public API
//--------------------------------------------------------------------------
return {
"FunctionDeclaration": startFunction,
"FunctionExpression": startFunction,
"ArrowFunctionExpression": startFunction,
"BlockStatement": countStatements,
"FunctionDeclaration:exit": endFunction,
"FunctionExpression:exit": endFunction,
"ArrowFunctionExpression:exit": endFunction
};
};
module.exports.schema = [
{
"type": "integer"
}
];