How to refactor a large and long process function to provide flexible customization to the user?

The problem is about refactoring. To refactor, we have the following tools:

• Patterns
• Recognize the nature of the problem, and reorganize

The original large process function relies on some parameters, and some steps.

So the first is to try to propose at least 2 or more scenarios that will fit into this process, and find what is shared among these usages.

This is a down-to-top solution.

Refactor

Closing ranges, shrink size of the target function.

Provide chances for user to customize some process

Make these customization reasonable, and simple.

Core

The most important thing we do is connect, connect components with their meaningful context.

For example, build a parent map for all ast nodes, so that we can lookup a node's file without knowing its context.