max-depth.js
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/**
* @fileoverview A rule to set the maximum depth block can be nested 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 = [],
maxDepth = context.options[0] || 4;
/**
* When parsing a new function, store it in our function stack
* @returns {void}
* @private
*/
function startFunction() {
functionStack.push(0);
}
/**
* When parsing is done then pop out the reference
* @returns {void}
* @private
*/
function endFunction() {
functionStack.pop();
}
/**
* Save the block and Evaluate the node
* @param {ASTNode} node node to evaluate
* @returns {void}
* @private
*/
function pushBlock(node) {
var len = ++functionStack[functionStack.length - 1];
if (len > maxDepth) {
context.report(node, "Blocks are nested too deeply ({{depth}}).",
{ depth: len });
}
}
/**
* Pop the saved block
* @returns {void}
* @private
*/
function popBlock() {
functionStack[functionStack.length - 1]--;
}
//--------------------------------------------------------------------------
// Public API
//--------------------------------------------------------------------------
return {
"Program": startFunction,
"FunctionDeclaration": startFunction,
"FunctionExpression": startFunction,
"ArrowFunctionExpression": startFunction,
"IfStatement": function(node) {
if (node.parent.type !== "IfStatement") {
pushBlock(node);
}
},
"SwitchStatement": pushBlock,
"TryStatement": pushBlock,
"DoWhileStatement": pushBlock,
"WhileStatement": pushBlock,
"WithStatement": pushBlock,
"ForStatement": pushBlock,
"ForInStatement": pushBlock,
"ForOfStatement": pushBlock,
"IfStatement:exit": popBlock,
"SwitchStatement:exit": popBlock,
"TryStatement:exit": popBlock,
"DoWhileStatement:exit": popBlock,
"WhileStatement:exit": popBlock,
"WithStatement:exit": popBlock,
"ForStatement:exit": popBlock,
"ForInStatement:exit": popBlock,
"ForOfStatement:exit": popBlock,
"FunctionDeclaration:exit": endFunction,
"FunctionExpression:exit": endFunction,
"ArrowFunctionExpression:exit": endFunction,
"Program:exit": endFunction
};
};
module.exports.schema = [
{
"type": "integer"
}
];