174 lines
5.4 KiB
JavaScript
174 lines
5.4 KiB
JavaScript
/**
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* @fileoverview A rule to set the maximum number of statements 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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// Requirements
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//------------------------------------------------------------------------------
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const astUtils = require("./utils/ast-utils");
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const { upperCaseFirst } = require("../shared/string-utils");
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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 number of statements allowed in function blocks",
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category: "Stylistic Issues",
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recommended: false,
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url: "https://eslint.org/docs/rules/max-statements"
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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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type: "object",
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properties: {
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ignoreTopLevelFunctions: {
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type: "boolean"
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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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messages: {
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exceed: "{{name}} has too many statements ({{count}}). Maximum allowed is {{max}}."
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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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ignoreTopLevelFunctions = context.options[1] && context.options[1].ignoreTopLevelFunctions || false,
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topLevelFunctions = [];
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let maxStatements = 10;
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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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maxStatements = option.maximum || option.max;
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} else if (typeof option === "number") {
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maxStatements = option;
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}
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/**
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* Reports a node if it has too many statements
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* @param {ASTNode} node node to evaluate
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* @param {int} count Number of statements in node
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* @param {int} max Maximum number of statements allowed
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* @returns {void}
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* @private
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*/
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function reportIfTooManyStatements(node, count, max) {
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if (count > max) {
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const name = upperCaseFirst(astUtils.getFunctionNameWithKind(node));
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context.report({
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node,
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messageId: "exceed",
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data: { name, count, max }
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});
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}
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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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* Evaluate the node at the end of function
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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 endFunction(node) {
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const count = functionStack.pop();
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if (ignoreTopLevelFunctions && functionStack.length === 0) {
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topLevelFunctions.push({ node, count });
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} else {
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reportIfTooManyStatements(node, count, maxStatements);
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}
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}
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/**
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* Increment the count of the functions
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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 countStatements(node) {
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functionStack[functionStack.length - 1] += node.body.length;
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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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FunctionDeclaration: startFunction,
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FunctionExpression: startFunction,
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ArrowFunctionExpression: startFunction,
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BlockStatement: countStatements,
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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"() {
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if (topLevelFunctions.length === 1) {
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return;
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}
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topLevelFunctions.forEach(element => {
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const count = element.count;
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const node = element.node;
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reportIfTooManyStatements(node, count, maxStatements);
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});
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}
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};
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}
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};
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