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033892777a
See issue #587. * Merge eval-ast and eval into a single conditional. * Expand macros during the apply phase, removing lots of duplicate tests, and increasing the overall consistency by allowing the macro to be computed instead of referenced by name (`((defmacro! cond (...)))` is currently illegal for example). * Print "EVAL: $ast" at the top of EVAL if DEBUG-EVAL exists in the MAL environment. * Remove macroexpand and quasiquoteexpand special forms. * Use pattern-matching style in process/step*.txt. Unresolved issues: c.2: unable to reproduce with gcc 11.12.0. elm: the directory is unchanged. groovy: sometimes fail, but not on each rebuild. nasm: fails some new soft tests, but the issue is unreproducible when running the interpreter manually. objpascal: unreproducible with fpc 3.2.2. ocaml: unreproducible with 4.11.1. perl6: unreproducible with rakudo 2021.09. Unrelated changes: Reduce diff betweens steps. Prevent defmacro! from mutating functions: c forth logo miniMAL vb. dart: fix recent errors and warnings ocaml: remove metadata from symbols. Improve the logo implementation. Encapsulate all representation in types.lg and env.lg, unwrap numbers. Replace some manual iterations with logo control structures. Reduce the diff between steps. Use native iteration in env_get and env_map Rewrite the reader with less temporary strings. Reduce the number of temporary lists (for example, reverse iteration with butlast requires O(n^2) allocations). It seems possible to remove a few exceptions: GC settings (Dockerfile), NO_SELF_HOSTING (IMPLS.yml) and step5_EXCLUDES (Makefile.impls) .
246 lines
9.0 KiB
Forth
246 lines
9.0 KiB
Forth
module REPL
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open System
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open Node
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open Types
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let rec iterPairs f = function
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| Pair(first, second, t) ->
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f first second
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iterPairs f t
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| Empty -> ()
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| _ -> raise <| Error.errExpectedX "list or vector"
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let rec qqLoop elt acc =
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match elt with
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| List(_, [Symbol("splice-unquote");list]) -> makeList [Symbol "concat"; list; acc]
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| List(_, Symbol("splice-unquote")::_) -> raise <| Error.wrongArity ()
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| _ -> makeList [Symbol "cons"; quasiquote elt; acc]
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and quasiquote = function
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| List(_, [Symbol("unquote");form]) -> form
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| List(_, Symbol("unquote")::_) -> raise <| Error.wrongArity ()
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| List (_, list) -> List.foldBack qqLoop list Node.EmptyLIST
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| Vector(_, segment) ->
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let array = Array.sub segment.Array segment.Offset segment.Count
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let folded = Array.foldBack qqLoop array Node.EmptyLIST
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makeList [Symbol "vec"; folded]
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| Map(_) as ast -> makeList [Symbol "quote"; ast]
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| Symbol(_) as ast -> makeList [Symbol "quote"; ast]
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| ast -> ast
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let quoteForm = function
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| [node] -> node
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| _ -> raise <| Error.wrongArity ()
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let rec defBangForm env = function
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| [sym; form] ->
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match sym with
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| Symbol(sym) ->
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let node = eval env form
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Env.set env sym node
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node
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| _ -> raise <| Error.errExpectedX "symbol"
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| _ -> raise <| Error.wrongArity ()
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and defMacroForm env = function
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| [sym; form] ->
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match sym with
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| Symbol(sym) ->
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let node = eval env form
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match node with
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| Func(_, _, f, body, binds, outer) ->
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let node = Env.makeMacro f body binds outer
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Env.set env sym node
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node
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| _ -> raise <| Error.errExpectedX "user defined func"
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| _ -> raise <| Error.errExpectedX "symbol"
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| _ -> raise <| Error.wrongArity ()
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and setBinding env first second =
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let s = match first with
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| Symbol(s) -> s
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| _ -> raise <| Error.errExpectedX "symbol"
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let form = eval env second
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Env.set env s form
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and letStarForm outer = function
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| [bindings; form] ->
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let inner = Env.makeNew outer [] []
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let binder = setBinding inner
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match bindings with
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| List(_) | Vector(_) -> iterPairs binder bindings
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| _ -> raise <| Error.errExpectedX "list or vector"
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inner, form
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| _ -> raise <| Error.wrongArity ()
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and ifForm env = function
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| [condForm; trueForm; falseForm] -> ifForm3 env condForm trueForm falseForm
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| [condForm; trueForm] -> ifForm3 env condForm trueForm Nil
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| _ -> raise <| Error.wrongArity ()
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and ifForm3 env condForm trueForm falseForm =
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match eval env condForm with
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| Bool(false) | Nil -> falseForm
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| _ -> trueForm
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and doForm env = function
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| [a] -> a
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| a::rest ->
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eval env a |> ignore
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doForm env rest
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| _ -> raise <| Error.wrongArity ()
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and fnStarForm outer nodes =
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let makeFunc binds body =
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let f = fun nodes ->
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let inner = Env.makeNew outer binds nodes
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eval inner body
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Env.makeFunc f body binds outer
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match nodes with
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| [List(_, binds); body] -> makeFunc binds body
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| [Vector(_, seg); body] -> makeFunc (List.ofSeq seg) body
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| [_; _] -> raise <| Error.errExpectedX "bindings of list or vector"
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| _ -> raise <| Error.wrongArity ()
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and catchForm env err = function
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| List(_, [Symbol("catch*"); Symbol(_) as sym; catchBody]) ->
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let inner = Env.makeNew env [sym] [err]
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catchBody |> eval inner
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| List(_, [_; _; _]) -> raise <| Error.argMismatch ()
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| _ -> raise <| Error.wrongArity ()
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and tryForm env = function
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| [exp] ->
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eval env exp
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| [exp; catchClause] ->
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try
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eval env exp
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with
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| Error.EvalError(str)
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| Error.ReaderError(str) -> catchForm env (String(str)) catchClause
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| Error.MalError(node) -> catchForm env node catchClause
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| _ -> raise <| Error.wrongArity ()
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and eval env ast =
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ignore <| match Env.get env "DEBUG-EVAL" with
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| None | Some(Bool(false)) | Some(Nil) -> ()
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| _ -> Printer.pr_str [ast] |> printfn "EVAL: %s"
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match ast with
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| Symbol(sym) -> match Env.get env sym with
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| Some(value) -> value
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| None -> Error.symbolNotFound sym |> raise
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| Vector(_, seg) -> seg |> Seq.map (eval env) |> Array.ofSeq |> Node.ofArray
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| Map(_, map) -> map |> Map.map (fun k v -> eval env v) |> makeMap
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| List(_, Symbol("def!")::rest) -> defBangForm env rest
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| List(_, Symbol("defmacro!")::rest) -> defMacroForm env rest
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| List(_, Symbol("let*")::rest) ->
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let inner, form = letStarForm env rest
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form |> eval inner
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| List(_, Symbol("if")::rest) -> ifForm env rest |> eval env
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| List(_, Symbol("do")::rest) -> doForm env rest |> eval env
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| List(_, Symbol("fn*")::rest) -> fnStarForm env rest
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| List(_, Symbol("quote")::rest) -> quoteForm rest
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| List(_, [Symbol("quasiquote");form]) -> eval env <| quasiquote form
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| List(_, Symbol("quasiquote")::_) -> raise <| Error.wrongArity ()
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| List(_, Symbol("try*")::rest) -> tryForm env rest
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| List(_, (a0 :: args)) ->
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match eval env a0 with
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| Macro(_, _, f, _, _, _) -> f args |> eval env
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| BuiltInFunc(_, _, f) -> List.map (eval env) args |> f
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| Func(_, _, _, body, binds, outer) ->
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let inner = List.map (eval env) args |> Env.makeNew outer binds
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body |> eval inner
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| _ -> raise <| Error.errExpectedX "func"
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| _ -> ast
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let READ input =
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Reader.read_str input
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let EVAL env ast =
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Some(eval env ast)
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let PRINT v =
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v
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|> Seq.singleton
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|> Printer.pr_str
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|> printfn "%s"
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let RE env input =
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READ input
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|> Seq.ofList
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|> Seq.choose (fun form -> EVAL env form)
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let REP env input =
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input
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|> RE env
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|> Seq.iter (fun value -> PRINT value)
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let getReadlineMode args =
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if args |> Array.exists (fun e -> e = "--raw") then
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Readline.Mode.Raw
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else
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Readline.Mode.Terminal
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let eval_func env = function
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| [ast] -> eval env ast
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| _ -> raise <| Error.wrongArity ()
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let argv_func = function
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| file::rest -> rest |> List.map Types.String |> makeList
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| [] -> EmptyLIST
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let readline_func mode = function
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| [String(prompt)] ->
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match Readline.read prompt mode with
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| null -> Node.NIL
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| input -> String(input)
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| [_] -> raise <| Error.argMismatch ()
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| _ -> raise <| Error.wrongArity ()
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let configureEnv args mode =
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let env = Env.makeRootEnv ()
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Env.set env "eval" <| Env.makeBuiltInFunc (eval_func env)
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Env.set env "*ARGV*" <| argv_func args
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Env.set env "readline" <| Env.makeBuiltInFunc (readline_func mode)
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RE env """
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(def! *host-language* "fsharp")
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(def! not (fn* (a) (if a false true)))
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(def! load-file (fn* (f) (eval (read-string (str "(do " (slurp f) "\nnil)")))))
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(defmacro! cond (fn* (& xs) (if (> (count xs) 0) (list 'if (first xs) (if (> (count xs) 1) (nth xs 1) (throw "odd number of forms to cond")) (cons 'cond (rest (rest xs)))))))
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""" |> Seq.iter ignore
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env
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[<EntryPoint>]
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let main args =
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let mode = getReadlineMode args
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let args = Seq.ofArray args |> Seq.filter (fun e -> e <> "--raw") |> List.ofSeq
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let env = configureEnv args mode
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match args with
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| file::_ ->
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System.IO.File.ReadAllText file
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|> RE env |> Seq.iter ignore
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0
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| _ ->
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RE env "(println (str \"Mal [\" *host-language* \"]\"))" |> Seq.iter ignore
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let rec loop () =
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match Readline.read "user> " mode with
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| null -> 0
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| input ->
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try
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REP env input
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with
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| Error.EvalError(str)
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| Error.ReaderError(str) ->
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printfn "Error: %s" str
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| Error.MalError(node) ->
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printfn "Error: %s" (Printer.pr_str [node])
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| ex ->
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printfn "Error: %s" (ex.Message)
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loop ()
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loop ()
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