118 lines
3.5 KiB
Plaintext
118 lines
3.5 KiB
Plaintext
/**
|
|
* @fileoverview Rule to enforce a maximum number of nested callbacks.
|
|
* @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 callbacks can be nested",
|
|
recommended: false,
|
|
url: "https://eslint.org/docs/latest/rules/max-nested-callbacks"
|
|
},
|
|
|
|
schema: [
|
|
{
|
|
oneOf: [
|
|
{
|
|
type: "integer",
|
|
minimum: 0
|
|
},
|
|
{
|
|
type: "object",
|
|
properties: {
|
|
maximum: {
|
|
type: "integer",
|
|
minimum: 0
|
|
},
|
|
max: {
|
|
type: "integer",
|
|
minimum: 0
|
|
}
|
|
},
|
|
additionalProperties: false
|
|
}
|
|
]
|
|
}
|
|
],
|
|
messages: {
|
|
exceed: "Too many nested callbacks ({{num}}). Maximum allowed is {{max}}."
|
|
}
|
|
},
|
|
|
|
create(context) {
|
|
|
|
//--------------------------------------------------------------------------
|
|
// Constants
|
|
//--------------------------------------------------------------------------
|
|
const option = context.options[0];
|
|
let THRESHOLD = 10;
|
|
|
|
if (
|
|
typeof option === "object" &&
|
|
(Object.prototype.hasOwnProperty.call(option, "maximum") || Object.prototype.hasOwnProperty.call(option, "max"))
|
|
) {
|
|
THRESHOLD = option.maximum || option.max;
|
|
} else if (typeof option === "number") {
|
|
THRESHOLD = option;
|
|
}
|
|
|
|
//--------------------------------------------------------------------------
|
|
// Helpers
|
|
//--------------------------------------------------------------------------
|
|
|
|
const callbackStack = [];
|
|
|
|
/**
|
|
* Checks a given function node for too many callbacks.
|
|
* @param {ASTNode} node The node to check.
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
function checkFunction(node) {
|
|
const parent = node.parent;
|
|
|
|
if (parent.type === "CallExpression") {
|
|
callbackStack.push(node);
|
|
}
|
|
|
|
if (callbackStack.length > THRESHOLD) {
|
|
const opts = { num: callbackStack.length, max: THRESHOLD };
|
|
|
|
context.report({ node, messageId: "exceed", data: opts });
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Pops the call stack.
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
function popStack() {
|
|
callbackStack.pop();
|
|
}
|
|
|
|
//--------------------------------------------------------------------------
|
|
// Public API
|
|
//--------------------------------------------------------------------------
|
|
|
|
return {
|
|
ArrowFunctionExpression: checkFunction,
|
|
"ArrowFunctionExpression:exit": popStack,
|
|
|
|
FunctionExpression: checkFunction,
|
|
"FunctionExpression:exit": popStack
|
|
};
|
|
|
|
}
|
|
};
|