Surgical Function Replacer

What is Function Replacer?

The Function Replacer is a surgical code refactoring tool designed for developers who need to modify function implementations while preserving their original signatures and contracts. This tool is particularly valuable during code maintenance, API updates, or when implementing new functionality within existing function boundaries without breaking calling code.

Unlike simple find-and-replace operations that can damage code structure, the Function Replacer intelligently identifies function boundaries, maintains indentation, and ensures that the replacement code fits seamlessly within the existing function structure. It handles complex Python function patterns including decorators, async functions, and nested code blocks.

How to use Function Replacer

1. Paste full source code - Enter the complete Python file containing the function you want to modify
2. Scan for functions - Click scan to identify all functions in the code automatically
3. Select target function - Choose the function whose logic you want to replace from the dropdown
4. Paste new implementation - Enter the new function logic (with or without signature)
5. Generate updated code - Click replace to create the modified code with preserved function signature

Key Features

• Signature preservation - Keeps function names, parameters, decorators, and documentation intact
• Indentation handling - Automatically adjusts code indentation to match the original function
• Pattern recognition - Identifies complex function definitions including async and decorated functions
• Code validation - Ensures the replacement code maintains proper Python syntax and structure
• One-way operation - Perfect for when you want to keep the original function interface
• Privacy guaranteed - All processing happens client-side with no server uploads

Frequently Asked Questions

Can it handle decorators and complex function definitions?
Yes! The tool recognizes function decorators, async/def keywords, type hints, and other Python function components. It preserves the complete function signature while only replacing the internal implementation logic.