1 import rdstdin, tables, sequtils, types, reader, printer, env, core
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 =
33 result = env.set(a1.str, a2.eval(env))
44 for i in countup(0, a1.list.high, 2):
45 letEnv.set(a1.list[i].str, a1.list[i+1].eval(letEnv))
47 result = a2.eval(letEnv)
50 let el = (list ast.list[1 .. ^1]).eval_ast(env)
51 result = el.list[el.list.high]
59 if cond.kind in {Nil, False}:
60 if ast.list.len > 3: result = ast.list[3].eval(env)
62 else: result = a2.eval(env)
69 result = fun(proc(a: varargs[MalType]): MalType =
70 var newEnv = initEnv(env2, a1, list(a))
74 let el = ast.eval_ast(env)
75 result = el.list[0].fun(el.list[1 .. ^1])
78 let el = ast.eval_ast(env)
79 result = el.list[0].fun(el.list[1 .. ^1])
82 result = ast.eval_ast(env)
84 proc print(exp: MalType): string = exp.pr_str
86 var repl_env = initEnv()
91 # core.nim: defined using nim
92 proc rep(str: string): string =
93 str.read.eval(repl_env).print
95 # core.mal: defined using mal itself
96 discard rep "(def! not (fn* (a) (if a false true)))"
100 let line = readLineFromStdin("user> ")
103 echo getCurrentExceptionMsg()
104 echo getCurrentException().getStackTrace()