Fabulous.AST 0.8.0

Fabulous.AST

Welcome to the Fabulous.AST, an Abstract Syntax Tree (AST) Domain Specific Language (DSL) for F#.

Fabulous.AST uses Fantomas to generate F# code from AST. This means that you can use Fabulous.AST to generate F# code that is formatted according to the Fantomas style guide. It's designed to provide a simple and expressive way to represent code as a tree of nodes. This makes it easier to manipulate and analyze code programmatically.

Let's take a look at an AST example in Fantomas:

open Fantomas.Core
open Fantomas.Core.SyntaxOak
open Fantomas.FCS.Text
Oak(
    [],
    [ ModuleOrNamespaceNode(
          None,
          [ BindingNode(
                None,
                None,
                MultipleTextsNode([ SingleTextNode("let", Range.Zero) ], Range.Zero),
                false,
                None,
                None,
                Choice1Of2(IdentListNode([ IdentifierOrDot.Ident(SingleTextNode("x", Range.Zero)) ], Range.Zero)),
                None,
                [],
                None,
                SingleTextNode("=", Range.Zero),
                Expr.Constant(Constant.FromText(SingleTextNode("12", Range.Zero))),
                Range.Zero
            )
            |> ModuleDecl.TopLevelBinding ],
          Range.Zero
      ) ],
    Range.Zero
)
|> CodeFormatter.FormatOakAsync
|> Async.RunSynchronously
|> printfn "%s"

produces the following code:

let x = 12

Now let's take a look at same example using Fabulous.AST:

open Fantomas.Core
open type Fabulous.AST.Ast

AnonymousModule() { 
    Value("x", "12", false)
}
|> Gen.mkOak
|> CodeFormatter.FormatOakAsync
|> Async.RunSynchronously
|> printfn "%s"

produces the following code:

let x = 12