How can I generate Go source code from an AST?

Generate Source Code in Go

In Go, generating source code from abstract syntax tree (AST) is achievable through the "go/printer" package. This package provides formatting and printing capabilities for Go syntax trees.

To generate source code from AST, you can follow these steps:

1. Parse the Go Source: Using the "go/parser" package, parse the source code into an AST representation.
2. Create a FileSet: Establish a token file set using "token.NewFileSet()." This serves as a reference point for positions within the syntax tree.
3. Generate the AST: Utilize "parser.ParseFile" to interpret the source code and create an AST.
4. Format and Print the AST: With the "go/printer" package, you can format and print the AST to generate the source code. Use "printer.Fprint" to output the processed AST to a file or standard output.

Here's an example code that demonstrates the process:

<code class="go">import (
    "go/parser"
    "go/printer"
    "go/token"
    "os"
)

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

    // Create AST
    fset := token.NewFileSet()
    f, err := parser.ParseFile(fset, "", src, 0)
    if err != nil {
      panic(err)
    }

    // Format and print AST
    printer.Fprint(os.Stdout, fset, f)
}</code>

This sample reads an input source code, parses it into an AST, and then prints the formatted source code.

By utilizing the "go/printer" package effectively, you can efficiently generate Go source code from AST representation.

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