1 import rdstdin, tables, sequtils, types, reader, printer, env
3 proc read(str: string): MalType = str.read_str
5 proc eval(ast: MalType, env: var Env): MalType
7 proc eval_ast(ast: MalType, env: var Env): MalType =
10 result = env.get(ast.str)
12 result = list ast.list.mapIt(MalType, it.eval(env))
14 result = vector ast.list.mapIt(MalType, it.eval(env))
17 for k, v in ast.hash_map.pairs:
18 result.hash_map[k] = v.eval(env)
22 proc eval(ast: MalType, env: var Env): MalType =
32 result = env.set(a1.str, a2.eval(env))
38 for i in countup(0, a1.list.high, 2):
39 letEnv.set(a1.list[i].str, a1.list[i+1].eval(letEnv))
41 result = a2.eval(letEnv)
43 let el = ast.eval_ast(env)
44 result = el.list[0].fun(el.list[1 .. ^1])
46 result = ast.eval_ast(env)
48 proc print(exp: MalType): string = exp.pr_str
50 template wrapNumberFun(op: expr): expr =
51 fun proc(xs: varargs[MalType]): MalType = number op(xs[0].number, xs[1].number)
53 var repl_env = initEnv()
55 repl_env.set("+", wrapNumberFun(`+`))
56 repl_env.set("-", wrapNumberFun(`-`))
57 repl_env.set("*", wrapNumberFun(`*`))
58 repl_env.set("/", wrapNumberFun(`div`))
59 #repl_env.set("/", wrapNumberFun(proc(x,y: int): int = int(x.float / y.float)))
61 proc rep(str: string): string =
62 str.read.eval(repl_env).print
66 let line = readLineFromStdin("user> ")
69 echo getCurrentExceptionMsg()
70 echo getCurrentException().getStackTrace()