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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('../types').Rule.RuleModule} */
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.hasOwn(option, "maximum") || Object.hasOwn(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,
};
},
};