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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) .
62 lines
1.8 KiB
Forth
62 lines
1.8 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 eval env ast =
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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(_, (a0 :: rest)) ->
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match eval env a0 with
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| BuiltInFunc(_, _, f) -> List.map (eval env) rest |> f
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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 REP 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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|> 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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[<EntryPoint>]
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let main args =
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let mode = getReadlineMode args
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let env = Env.makeRootEnv ()
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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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| ex ->
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printfn "Error: %s" (ex.Message)
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loop ()
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loop ()
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