How to Convert Go AST Back to Source Code?

How to Generate Go Source Code

This question addresses the challenge of converting Go source files into a suitable syntax tree representation using the go/parser package. However, generating Go source code from the syntax tree remained an unsolved problem.

The go/printer package offers a solution to this issue. It allows conversion of Abstract Syntax Trees (ASTs) back into source code.

Consider the following code sample:

<code class="go">package main

import (
        "go/parser"
        "go/printer"
        "go/token"
        "os"
)

func main() {
        // Input source code
        src := `
package main
func main() {
        println("Hello, World!")
}
`

        // Parse the source code into an AST
        fset := token.NewFileSet()
        f, err := parser.ParseFile(fset, "", src, 0)
        if err != nil {
                panic(err)
        }

        // Print the AST as source code
        printer.Fprint(os.Stdout, fset, f)

}</code>

When executed, this code snippet reads a source string, parses it into an AST, and then prints the AST back as Go source code. The result is the original input source code.

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