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165 lines
5.6 KiB
165 lines
5.6 KiB
/**
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* @fileoverview Counts the cyclomatic complexity of each function of the script. See http://en.wikipedia.org/wiki/Cyclomatic_complexity.
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* Counts the number of if, conditional, for, while, try, switch/case,
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* @author Patrick Brosset
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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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/** @type {import('../shared/types').Rule} */
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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 cyclomatic complexity allowed in a program",
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recommended: false,
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url: "https://eslint.org/docs/latest/rules/complexity"
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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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complex: "{{name}} has a complexity of {{complexity}}. Maximum allowed is {{max}}."
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}
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},
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create(context) {
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const option = context.options[0];
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let THRESHOLD = 20;
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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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THRESHOLD = option.maximum || option.max;
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} else if (typeof option === "number") {
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THRESHOLD = option;
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}
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//--------------------------------------------------------------------------
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// Helpers
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//--------------------------------------------------------------------------
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// Using a stack to store complexity per code path
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const complexities = [];
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/**
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* Increase the complexity of the code path in context
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* @returns {void}
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* @private
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*/
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function increaseComplexity() {
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complexities[complexities.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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onCodePathStart() {
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// The initial complexity is 1, representing one execution path in the CodePath
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complexities.push(1);
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},
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// Each branching in the code adds 1 to the complexity
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CatchClause: increaseComplexity,
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ConditionalExpression: increaseComplexity,
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LogicalExpression: increaseComplexity,
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ForStatement: increaseComplexity,
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ForInStatement: increaseComplexity,
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ForOfStatement: increaseComplexity,
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IfStatement: increaseComplexity,
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WhileStatement: increaseComplexity,
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DoWhileStatement: increaseComplexity,
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// Avoid `default`
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"SwitchCase[test]": increaseComplexity,
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// Logical assignment operators have short-circuiting behavior
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AssignmentExpression(node) {
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if (astUtils.isLogicalAssignmentOperator(node.operator)) {
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increaseComplexity();
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}
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},
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onCodePathEnd(codePath, node) {
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const complexity = complexities.pop();
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/*
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* This rule only evaluates complexity of functions, so "program" is excluded.
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* Class field initializers and class static blocks are implicit functions. Therefore,
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* they shouldn't contribute to the enclosing function's complexity, but their
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* own complexity should be evaluated.
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*/
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if (
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codePath.origin !== "function" &&
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codePath.origin !== "class-field-initializer" &&
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codePath.origin !== "class-static-block"
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) {
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return;
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}
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if (complexity > THRESHOLD) {
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let name;
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if (codePath.origin === "class-field-initializer") {
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name = "class field initializer";
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} else if (codePath.origin === "class-static-block") {
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name = "class static block";
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} else {
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name = astUtils.getFunctionNameWithKind(node);
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}
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context.report({
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node,
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messageId: "complex",
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data: {
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name: upperCaseFirst(name),
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complexity,
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max: THRESHOLD
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}
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});
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}
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}
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};
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}
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};
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