How To Generate Go Source Code From An AST?

Generating Go Source Code

You have inquired about generating Go source code. The go/parser package provides the functionality to generate an AST (Abstract Syntax Tree) from a Go source file. However, you have expressed difficulty in generating Go source code from the AST.

Fortunately, the go/printer package offers a solution to this problem. By utilizing this package, you can effortlessly convert an AST back into its source code form.

Consider the example below (adapted from another source):

<code class="go">package main

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

func main() {
        // src represents the input source code for which we want to print the AST.
        src := `
package main
func main() {
        println("Hello, World!")
}
`

        // Create the AST by parsing src.
        fset := token.NewFileSet() // positions are relative to fset
        f, err := parser.ParseFile(fset, "", src, 0)
        if err != nil {
                panic(err)
        }

        printer.Fprint(os.Stdout, fset, f)

}</code>

Executing this example will produce the following output:

package main

func main() {
        println("Hello, World!")
}

This demonstrates the effective use of the go/printer package in converting an AST back into its source code representation.

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