how to get cfg from ast

As an AI language model, I assume you are asking about how to get the configuration file (cfg) from an abstract syntax tree (AST) in the context of programming.

In general, an AST is a data structure that represents the syntax of a computer program. It is usually generated by a compiler or parser after the program's source code is analyzed. The AST contains information about the program's structure, such as its variables, functions, and control flow.

To obtain a configuration file from an AST, you would need to specify the format of the configuration file, such as YAML or JSON. Then, you would need to traverse the AST and extract the relevant information to generate the configuration file.

For example, if you have an AST for a Python program, you could extract the variables and their values from the AST and write them to a YAML configuration file. Similarly, if you have an AST for a JavaScript program, you could extract the variables, functions, and their parameters from the AST and write them to a JSON configuration file.

The specific steps to extract information from an AST and generate a configuration file will depend on the programming language and the format of the configuration file. However, the general process involves traversing the AST and extracting the relevant information to generate the configuration file.