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qwen/nodejs/node_modules/eslint/lib/rules/complexity.js

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