155 lines
4.6 KiB
JavaScript
155 lines
4.6 KiB
JavaScript
/**
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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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*/
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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 = {
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meta: {
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type: "suggestion",
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docs: {
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description: "enforce a maximum depth that blocks can be nested",
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category: "Stylistic Issues",
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recommended: false,
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url: "https://eslint.org/docs/rules/max-depth"
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},
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schema: [
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{
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oneOf: [
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{
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type: "integer",
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minimum: 0
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},
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{
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type: "object",
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properties: {
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maximum: {
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type: "integer",
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minimum: 0
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},
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max: {
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type: "integer",
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minimum: 0
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}
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},
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additionalProperties: false
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}
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]
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}
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],
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messages: {
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tooDeeply: "Blocks are nested too deeply ({{depth}}). Maximum allowed is {{maxDepth}}."
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}
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},
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create(context) {
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//--------------------------------------------------------------------------
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// Helpers
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//--------------------------------------------------------------------------
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const functionStack = [],
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option = context.options[0];
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let maxDepth = 4;
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if (
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typeof option === "object" &&
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(Object.prototype.hasOwnProperty.call(option, "maximum") || Object.prototype.hasOwnProperty.call(option, "max"))
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) {
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maxDepth = option.maximum || option.max;
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}
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if (typeof option === "number") {
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maxDepth = option;
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}
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/**
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* When parsing a new function, store it in our function stack
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* @returns {void}
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* @private
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*/
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function startFunction() {
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functionStack.push(0);
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}
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/**
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* When parsing is done then pop out the reference
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* @returns {void}
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* @private
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*/
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function endFunction() {
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functionStack.pop();
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}
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/**
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* Save the block and Evaluate the node
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* @param {ASTNode} node node to evaluate
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* @returns {void}
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* @private
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*/
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function pushBlock(node) {
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const len = ++functionStack[functionStack.length - 1];
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if (len > maxDepth) {
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context.report({ node, messageId: "tooDeeply", data: { depth: len, maxDepth } });
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}
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}
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/**
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* Pop the saved block
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* @returns {void}
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* @private
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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(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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};
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