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/** * @fileoverview A rule to set the maximum depth block can be nested in a function. * @author Ian Christian Myers */ "use strict"; //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../shared/types').Rule} */ module.exports = { meta: { type: "suggestion", docs: { description: "Enforce a maximum depth that blocks can be nested", recommended: false, url: "https://eslint.org/docs/latest/rules/max-depth" }, schema: [ { oneOf: [ { type: "integer", minimum: 0 }, { type: "object", properties: { maximum: { type: "integer", minimum: 0 }, max: { type: "integer", minimum: 0 } }, additionalProperties: false } ] } ], messages: { tooDeeply: "Blocks are nested too deeply ({{depth}}). Maximum allowed is {{maxDepth}}." } }, create(context) { //-------------------------------------------------------------------------- // Helpers //-------------------------------------------------------------------------- const functionStack = [], option = context.options[0]; let maxDepth = 4; if ( typeof option === "object" && (Object.prototype.hasOwnProperty.call(option, "maximum") || Object.prototype.hasOwnProperty.call(option, "max")) ) { maxDepth = option.maximum || option.max; } if (typeof option === "number") { maxDepth = option; } /** * 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) { const len = ++functionStack[functionStack.length - 1]; if (len > maxDepth) { context.report({ node, messageId: "tooDeeply", data: { depth: len, maxDepth } }); } } /** * Pop the saved block * @returns {void} * @private */ function popBlock() { functionStack[functionStack.length - 1]--; } //-------------------------------------------------------------------------- // Public API //-------------------------------------------------------------------------- return { Program: startFunction, FunctionDeclaration: startFunction, FunctionExpression: startFunction, ArrowFunctionExpression: startFunction, StaticBlock: startFunction, IfStatement(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, "StaticBlock:exit": endFunction, "Program:exit": endFunction }; } };