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fd3adc52 C |
1 | module T = Types.Types |
2 | ||
3 | let repl_env = Env.make (Some Core.ns) | |
4 | ||
5 | let rec quasiquote ast = | |
6 | match ast with | |
7 | | T.List { T.value = [T.Symbol {T.value = "unquote"}; ast] } -> ast | |
8 | | T.Vector { T.value = [T.Symbol {T.value = "unquote"}; ast] } -> ast | |
9 | | T.List { T.value = T.List { T.value = [T.Symbol {T.value = "splice-unquote"}; head]} :: tail } | |
10 | | T.Vector { T.value = T.List { T.value = [T.Symbol {T.value = "splice-unquote"}; head]} :: tail } -> | |
11 | Types.list [Types.symbol "concat"; head; quasiquote (Types.list tail)] | |
12 | | T.List { T.value = head :: tail } | |
13 | | T.Vector { T.value = head :: tail } -> | |
14 | Types.list [Types.symbol "cons"; quasiquote head; quasiquote (Types.list tail) ] | |
15 | | ast -> Types.list [Types.symbol "quote"; ast] | |
16 | ||
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17 | let kw_macro = T.Keyword "macro" |
18 | ||
19 | let is_macro_call ast env = | |
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20 | match ast with |
21 | | T.List { T.value = s :: args } -> | |
22 | (match (try Env.get env s with _ -> T.Nil) with | |
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23 | | T.Fn { T.meta = T.Map { T.value = meta } } |
24 | -> Types.MalMap.mem kw_macro meta && Types.to_bool (Types.MalMap.find kw_macro meta) | |
25 | | _ -> false) | |
26 | | _ -> false | |
27 | ||
28 | let rec macroexpand ast env = | |
29 | if is_macro_call ast env | |
30 | then match ast with | |
31 | | T.List { T.value = s :: args } -> | |
32 | (match (try Env.get env s with _ -> T.Nil) with | |
33 | | T.Fn { T.value = f } -> macroexpand (f args) env | |
34 | | _ -> ast) | |
35 | | _ -> ast | |
36 | else ast | |
fd3adc52 C |
37 | |
38 | let rec eval_ast ast env = | |
39 | match ast with | |
40 | | T.Symbol s -> Env.get env ast | |
41 | | T.List { T.value = xs; T.meta = meta } | |
42 | -> T.List { T.value = (List.map (fun x -> eval x env) xs); | |
2b8e0ea4 | 43 | T.meta = meta } |
fd3adc52 C |
44 | | T.Vector { T.value = xs; T.meta = meta } |
45 | -> T.Vector { T.value = (List.map (fun x -> eval x env) xs); | |
2b8e0ea4 | 46 | T.meta = meta } |
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47 | | T.Map { T.value = xs; T.meta = meta } |
48 | -> T.Map {T.meta = meta; | |
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49 | T.value = (Types.MalMap.fold |
50 | (fun k v m | |
51 | -> Types.MalMap.add (eval k env) (eval v env) m) | |
52 | xs | |
53 | Types.MalMap.empty)} | |
54 | | _ -> ast | |
55 | and eval ast env = | |
56 | match macroexpand ast env with | |
57 | | T.List { T.value = [(T.Symbol { T.value = "def!" }); key; expr] } -> | |
58 | let value = (eval expr env) in | |
59 | Env.set env key value; value | |
60 | | T.List { T.value = [(T.Symbol { T.value = "defmacro!" }); key; expr] } -> | |
61 | (match (eval expr env) with | |
62 | | T.Fn { T.value = f; T.meta = meta } -> | |
2b8e0ea4 C |
63 | let fn = T.Fn { T.value = f; meta = Core.assoc [meta; kw_macro; (T.Bool true)]} |
64 | in Env.set env key fn; fn | |
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65 | | _ -> raise (Invalid_argument "devmacro! value must be a fn")) |
66 | | T.List { T.value = [(T.Symbol { T.value = "let*" }); (T.Vector { T.value = bindings }); body] } | |
67 | | T.List { T.value = [(T.Symbol { T.value = "let*" }); (T.List { T.value = bindings }); body] } -> | |
68 | (let sub_env = Env.make (Some env) in | |
69 | let rec bind_pairs = (function | |
70 | | sym :: expr :: more -> | |
71 | Env.set sub_env sym (eval expr sub_env); | |
72 | bind_pairs more | |
73 | | _::[] -> raise (Invalid_argument "let* bindings must be an even number of forms") | |
74 | | [] -> ()) | |
75 | in bind_pairs bindings; | |
76 | eval body sub_env) | |
77 | | T.List { T.value = ((T.Symbol { T.value = "do" }) :: body) } -> | |
78 | List.fold_left (fun x expr -> eval expr env) T.Nil body | |
79 | | T.List { T.value = [T.Symbol { T.value = "if" }; test; then_expr; else_expr] } -> | |
80 | if Types.to_bool (eval test env) then (eval then_expr env) else (eval else_expr env) | |
81 | | T.List { T.value = [T.Symbol { T.value = "if" }; test; then_expr] } -> | |
82 | if Types.to_bool (eval test env) then (eval then_expr env) else T.Nil | |
83 | | T.List { T.value = [T.Symbol { T.value = "fn*" }; T.Vector { T.value = arg_names }; expr] } | |
84 | | T.List { T.value = [T.Symbol { T.value = "fn*" }; T.List { T.value = arg_names }; expr] } -> | |
85 | Types.fn | |
86 | (function args -> | |
87 | let sub_env = Env.make (Some env) in | |
88 | let rec bind_args a b = | |
89 | (match a, b with | |
90 | | [T.Symbol { T.value = "&" }; name], args -> Env.set sub_env name (Types.list args); | |
91 | | (name :: names), (arg :: args) -> | |
92 | Env.set sub_env name arg; | |
93 | bind_args names args; | |
94 | | [], [] -> () | |
95 | | _ -> raise (Invalid_argument "Bad param count in fn call")) | |
96 | in bind_args arg_names args; | |
97 | eval expr sub_env) | |
98 | | T.List { T.value = [T.Symbol { T.value = "quote" }; ast] } -> ast | |
99 | | T.List { T.value = [T.Symbol { T.value = "quasiquote" }; ast] } -> | |
100 | eval (quasiquote ast) env | |
101 | | T.List { T.value = [T.Symbol { T.value = "macroexpand" }; ast] } -> | |
102 | macroexpand ast env | |
103 | | T.List { T.value = [T.Symbol { T.value = "try*" }; scary ; | |
104 | T.List { T.value = [T.Symbol { T.value = "catch*" }; | |
105 | local ; handler]}]} -> | |
106 | (try (eval scary env) | |
107 | with exn -> | |
108 | let value = match exn with | |
109 | | Types.MalExn value -> value | |
110 | | Invalid_argument msg -> T.String msg | |
111 | | _ -> (T.String "OCaml exception") in | |
112 | let sub_env = Env.make (Some env) in | |
113 | Env.set sub_env local value; | |
114 | eval handler sub_env) | |
115 | | T.List _ as ast -> | |
116 | (match eval_ast ast env with | |
117 | | T.List { T.value = ((T.Fn { T.value = f }) :: args) } -> f args | |
118 | | _ -> raise (Invalid_argument "Cannot invoke non-function")) | |
119 | | ast -> eval_ast ast env | |
120 | ||
121 | let read str = Reader.read_str str | |
122 | let print exp = Printer.pr_str exp true | |
123 | let rep str env = print (eval (read str) env) | |
124 | ||
125 | let rec main = | |
126 | try | |
127 | Core.init Core.ns; | |
128 | Env.set repl_env (Types.symbol "*ARGV*") | |
129 | (Types.list (if Array.length Sys.argv > 1 | |
130 | then (List.map (fun x -> T.String x) (List.tl (List.tl (Array.to_list Sys.argv)))) | |
131 | else [])); | |
132 | Env.set repl_env (Types.symbol "eval") | |
133 | (Types.fn (function [ast] -> eval ast repl_env | _ -> T.Nil)); | |
134 | ||
135 | ignore (rep "(def! *host-language* \"ocaml\")" repl_env); | |
136 | ignore (rep "(def! load-file (fn* (f) (eval (read-string (str \"(do \" (slurp f) \")\")))))" repl_env); | |
137 | ignore (rep "(def! not (fn* (a) (if a false true)))" repl_env); | |
138 | ignore (rep "(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)))))))" repl_env); | |
48572759 DM |
139 | ignore (rep "(def! *gensym-counter* (atom 0))" repl_env); |
140 | ignore (rep "(def! gensym (fn* [] (symbol (str \"G__\" (swap! *gensym-counter* (fn* [x] (+ 1 x)))))))" repl_env); | |
141 | ignore (rep "(defmacro! or (fn* (& xs) (if (empty? xs) nil (if (= 1 (count xs)) (first xs) (let* (condvar (gensym)) `(let* (~condvar ~(first xs)) (if ~condvar ~condvar (or ~@(rest xs)))))))))" repl_env); | |
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142 | |
143 | if Array.length Sys.argv > 1 then | |
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144 | try |
145 | ignore (rep ("(load-file \"" ^ Sys.argv.(1) ^ "\")") repl_env); | |
146 | with | |
147 | | Types.MalExn exc -> | |
148 | output_string stderr ("Exception: " ^ (print exc) ^ "\n"); | |
149 | flush stderr | |
1ac37587 C |
150 | else begin |
151 | ignore (rep "(println (str \"Mal [\" *host-language* \"]\"))" repl_env); | |
152 | while true do | |
153 | print_string "user> "; | |
154 | let line = read_line () in | |
155 | try | |
156 | print_endline (rep line repl_env); | |
157 | with End_of_file -> () | |
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158 | | Types.MalExn exc -> |
159 | output_string stderr ("Exception: " ^ (print exc) ^ "\n"); | |
160 | flush stderr | |
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161 | | Invalid_argument x -> |
162 | output_string stderr ("Invalid_argument exception: " ^ x ^ "\n"); | |
163 | flush stderr | |
164 | | _ -> | |
165 | output_string stderr ("Erroringness!\n"); | |
166 | flush stderr | |
167 | done | |
168 | end | |
fd3adc52 | 169 | with End_of_file -> () |