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89 lines
2.5 KiB
89 lines
2.5 KiB
/**
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* @fileoverview A rule to set the maximum depth block can be nested in a function.
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* @author Ian Christian Myers
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* @copyright 2013 Ian Christian Myers. All rights reserved.
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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module.exports = function(context) {
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//--------------------------------------------------------------------------
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// Helpers
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//--------------------------------------------------------------------------
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var functionStack = [],
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maxDepth = context.options[0] || 4;
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function startFunction() {
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functionStack.push(0);
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}
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function endFunction() {
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functionStack.pop();
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}
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function pushBlock(node) {
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var len = ++functionStack[functionStack.length - 1];
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if (len > maxDepth) {
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context.report(node, "Blocks are nested too deeply ({{depth}}).",
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{ depth: len });
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}
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}
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function popBlock() {
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functionStack[functionStack.length - 1]--;
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}
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//--------------------------------------------------------------------------
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// Public API
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//--------------------------------------------------------------------------
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return {
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"Program": startFunction,
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"FunctionDeclaration": startFunction,
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"FunctionExpression": startFunction,
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"ArrowFunctionExpression": startFunction,
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"IfStatement": function(node) {
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if (node.parent.type !== "IfStatement") {
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pushBlock(node);
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}
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},
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"SwitchStatement": pushBlock,
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"TryStatement": pushBlock,
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"DoWhileStatement": pushBlock,
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"WhileStatement": pushBlock,
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"WithStatement": pushBlock,
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"ForStatement": pushBlock,
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"ForInStatement": pushBlock,
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"ForOfStatement": pushBlock,
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"IfStatement:exit": popBlock,
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"SwitchStatement:exit": popBlock,
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"TryStatement:exit": popBlock,
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"DoWhileStatement:exit": popBlock,
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"WhileStatement:exit": popBlock,
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"WithStatement:exit": popBlock,
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"ForStatement:exit": popBlock,
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"ForInStatement:exit": popBlock,
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"ForOfStatement:exit": popBlock,
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"FunctionDeclaration:exit": endFunction,
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"FunctionExpression:exit": endFunction,
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"ArrowFunctionExpression:exit": endFunction,
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"Program:exit": endFunction
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};
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};
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module.exports.schema = [
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{
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"type": "integer"
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}
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];
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