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Hosting the DLR with IronPython or Ruby

Definition of the dynamic resolution operators for hosting the DLR. You can either use Ruby or Python, as the module isn't language specific. 

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module FSharp
    module DlrHosting = 
        open System.Reflection
        open Microsoft.Scripting
        open Microsoft.FSharp.Reflection
        open Microsoft.Scripting.Hosting
       
        let mutable dlrEngine:ScriptEngine = null
                
        let (?) (instance : obj) member' : 'Result = 
            let resultType =  typeof<'Result>
            
            // did we get invoked as a callable member ?
            if FSharpType.IsFunction resultType then
                //the called member from the dlr type should really be a callable!
                let callable = dlrEngine.Operations.GetMember(instance, member')
                if not (dlrEngine.Operations.IsCallable(callable))
                    then failwithf "%s is not callable" member'
                
                let invokeWithNoArguments = fun _ -> [||]
                let invokeWithOneArgument = fun arg -> [|arg|]
                let invokeWithManyArguments = fun args -> FSharpValue.GetTupleFields(args) 
                
                let functionType, _ = FSharpType.GetFunctionElements(resultType)
                let determineArgsFromInvocation = 
                    match functionType with
                    | type' when type' = typeof<unit> -> invokeWithNoArguments
                    | type' when FSharpType.IsTuple type' -> invokeWithManyArguments
                    | _ -> invokeWithOneArgument
                               
                downcast FSharpValue.MakeFunction(resultType, fun argsFromInvocation -> 
                    dlrEngine.Operations.Invoke(callable, determineArgsFromInvocation(argsFromInvocation) ) ) 
            else
                downcast dlrEngine.Operations.GetMember(instance, member')
        
        let (?<-) (instance : obj) member' value = 
            dlrEngine.Operations.SetMember(instance, member', value)

        let createScriptSource (scriptText:string) = 
            dlrEngine.CreateScriptSourceFromString(scriptText, SourceCodeKind.AutoDetect)

        let executeScriptSource (source:ScriptSource) (scope:ScriptScope) = 
            source.Execute(scope)

        let (|>>) (scope : ScriptScope) codeString = 
            let source = createScriptSource(codeString)
            executeScriptSource source scope |> ignore
            scope

        let (|>?) (scope : ScriptScope) codeString = 
            let source = createScriptSource(codeString)
            executeScriptSource source scope


//Example:  I've used the template engine Jinja2 for rendering
// HTML for demonstrating interop.
open System.Collections.Generic
open System
open System.IO

open Microsoft.FSharp.Core
open FSharp.DlrHosting
open IronPython.Hosting


dlrEngine <- Python.CreateEngine()

let sitePackages = Path.Combine( Environment.CurrentDirectory, "Lib", "site-packages")
let sys = dlrEngine.GetSysModule()
sys?path?append(sitePackages)

let convertFunc f =
    FSharpFunc.ToConverter f

let pymodule = createScope() |>> @"
from jinja2 import FileSystemLoader, DictLoader, FunctionLoader
from jinja2 import Environment
import os

def render( data_context, templateLoader, template_name ):
    env = Environment(loader=templateLoader)
    print templateLoader
    template = env.get_template(template_name)        
    return template.render( data_context )     
"

let loadTemplate name = 
   match name with 
    | "result.tmpl" -> "<html><body>{{ greeting }}</body></html>"
    | _ -> "" 

let templateLoader = pymodule?FunctionLoader(convertFunc loadTemplate) |> box

let data = new Dictionary<obj,obj>()
data.["greeting"] <- "hello python from fsharp"

let rendered:string = pymodule?render(data, templateLoader, "result.tmpl") 

printfn "%s" rendered
pymodule |>> "test = 2+2" |> ignore
printfn "%i" pymodule?test |> unbox
printfn "%i" (pymodule |>? "3+4" |> unbox)
Multiple items
module FSharp

--------------------
namespace Microsoft.FSharp
module DlrHosting

from FSharp
namespace System
namespace System.Reflection
namespace Microsoft
namespace Microsoft.FSharp
namespace Microsoft.FSharp.Reflection
val mutable dlrEngine : obj

Full name: FSharp.DlrHosting.dlrEngine
val instance : obj
type obj = System.Object

Full name: Microsoft.FSharp.Core.obj
val member' : string
val resultType : System.Type
val typeof<'T> : System.Type

Full name: Microsoft.FSharp.Core.Operators.typeof
type FSharpType =
  static member GetExceptionFields : exceptionType:Type * ?bindingFlags:BindingFlags -> PropertyInfo []
  static member GetFunctionElements : functionType:Type -> Type * Type
  static member GetRecordFields : recordType:Type * ?bindingFlags:BindingFlags -> PropertyInfo []
  static member GetTupleElements : tupleType:Type -> Type []
  static member GetUnionCases : unionType:Type * ?bindingFlags:BindingFlags -> UnionCaseInfo []
  static member IsExceptionRepresentation : exceptionType:Type * ?bindingFlags:BindingFlags -> bool
  static member IsFunction : typ:Type -> bool
  static member IsModule : typ:Type -> bool
  static member IsRecord : typ:Type * ?bindingFlags:BindingFlags -> bool
  static member IsTuple : typ:Type -> bool
  ...

Full name: Microsoft.FSharp.Reflection.FSharpType
static member FSharpType.IsFunction : typ:System.Type -> bool
val callable : obj
val not : value:bool -> bool

Full name: Microsoft.FSharp.Core.Operators.not
val failwithf : format:Printf.StringFormat<'T,'Result> -> 'T

Full name: Microsoft.FSharp.Core.ExtraTopLevelOperators.failwithf
val invokeWithNoArguments : ('a -> 'b [])
val invokeWithOneArgument : ('a -> 'a [])
val arg : 'a
val invokeWithManyArguments : ('a -> obj [])
val args : 'a
type FSharpValue =
  static member GetExceptionFields : exn:obj * ?bindingFlags:BindingFlags -> obj []
  static member GetRecordField : record:obj * info:PropertyInfo -> obj
  static member GetRecordFields : record:obj * ?bindingFlags:BindingFlags -> obj []
  static member GetTupleField : tuple:obj * index:int -> obj
  static member GetTupleFields : tuple:obj -> obj []
  static member GetUnionFields : value:obj * unionType:Type * ?bindingFlags:BindingFlags -> UnionCaseInfo * obj []
  static member MakeFunction : functionType:Type * implementation:(obj -> obj) -> obj
  static member MakeRecord : recordType:Type * values:obj [] * ?bindingFlags:BindingFlags -> obj
  static member MakeTuple : tupleElements:obj [] * tupleType:Type -> obj
  static member MakeUnion : unionCase:UnionCaseInfo * args:obj [] * ?bindingFlags:BindingFlags -> obj
  ...

Full name: Microsoft.FSharp.Reflection.FSharpValue
static member FSharpValue.GetTupleFields : tuple:obj -> obj []
val functionType : System.Type
static member FSharpType.GetFunctionElements : functionType:System.Type -> System.Type * System.Type
val determineArgsFromInvocation : (obj -> obj [])
val type' : System.Type
type unit = Unit

Full name: Microsoft.FSharp.Core.unit
static member FSharpType.IsTuple : typ:System.Type -> bool
static member FSharpValue.MakeFunction : functionType:System.Type * implementation:(obj -> obj) -> obj
val argsFromInvocation : obj
val member' : 'a
val value : 'b
val createScriptSource : scriptText:string -> 'a

Full name: FSharp.DlrHosting.createScriptSource
val scriptText : string
Multiple items
val string : value:'T -> string

Full name: Microsoft.FSharp.Core.Operators.string

--------------------
type string = System.String

Full name: Microsoft.FSharp.Core.string
val executeScriptSource : source:'a -> scope:'b -> 'c

Full name: FSharp.DlrHosting.executeScriptSource
val source : 'a
val scope : 'b
val scope : 'a
val codeString : string
val source : obj
val ignore : value:'T -> unit

Full name: Microsoft.FSharp.Core.Operators.ignore
namespace System.Collections
namespace System.Collections.Generic
namespace System.IO
namespace Microsoft.FSharp.Core
new : unit -> FSharpFunc<'T,'U>
static member FSharpFunc.ToConverter : func:('T -> 'U) -> System.Converter<'T,'U>
val box : value:'T -> obj

Full name: Microsoft.FSharp.Core.Operators.box
val printfn : format:Printf.TextWriterFormat<'T> -> 'T

Full name: Microsoft.FSharp.Core.ExtraTopLevelOperators.printfn
val unbox : value:obj -> 'T

Full name: Microsoft.FSharp.Core.Operators.unbox

More information

Link:http://fssnip.net/3O
Posted:14 years ago
Author:Rainer Schuster
Tags: dlr , ironpython , ironruby , dynamic

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