DISABLE FDs (REMOVE ME).

[jackhill/mal.git] / python / step4_if_fn_do.py

import sys, traceback
import mal_readline
import mal_types as types
import reader, printer
from env import Env
import core

# read
def READ(str):
    return reader.read_str(str)

# eval
def eval_ast(ast, env):
    if types._symbol_Q(ast):
        return env.get(ast)
    elif types._list_Q(ast):
        return types._list(*map(lambda a: EVAL(a, env), ast))
    elif types._vector_Q(ast):
        return types._vector(*map(lambda a: EVAL(a, env), ast))
    elif types._hash_map_Q(ast):
        keyvals = []
        for k in ast.keys():
            keyvals.append(EVAL(k, env))
            keyvals.append(EVAL(ast[k], env))
        return types._hash_map(*keyvals)
    else:
        return ast  # primitive value, return unchanged

def EVAL(ast, env):
        #print("EVAL %s" % printer._pr_str(ast))
        if not types._list_Q(ast):
            return eval_ast(ast, env)

        # apply list
        if len(ast) == 0: return ast
        a0 = ast[0]

        if "def!" == a0:
            a1, a2 = ast[1], ast[2]
            res = EVAL(a2, env)
            return env.set(a1, res)
        elif "let*" == a0:
            a1, a2 = ast[1], ast[2]
            let_env = Env(env)
            for i in range(0, len(a1), 2):
                let_env.set(a1[i], EVAL(a1[i+1], let_env))
            return EVAL(a2, let_env)
        elif "do" == a0:
            el = eval_ast(ast[1:], env)
            return el[-1]
        elif "if" == a0:
            a1, a2 = ast[1], ast[2]
            cond = EVAL(a1, env)
            if cond is None or cond is False:
                if len(ast) > 3: return EVAL(ast[3], env)
                else:            return None
            else:
                return EVAL(a2, env)
        elif "fn*" == a0:
            a1, a2 = ast[1], ast[2]
            return types._function(EVAL, Env, a2, env, a1)
        else:
            el = eval_ast(ast, env)
            f = el[0]
            return f(*el[1:])

# print
def PRINT(exp):
    return printer._pr_str(exp)

# repl
repl_env = Env()
def REP(str):
    return PRINT(EVAL(READ(str), repl_env))

# core.py: defined using python
for k, v in core.ns.items(): repl_env.set(types._symbol(k), v)

# core.mal: defined using the language itself
REP("(def! not (fn* (a) (if a false true)))")

# repl loop
while True:
    try:
        line = mal_readline.readline("user> ")
        if line == None: break
        if line == "": continue
        print(REP(line))
    except reader.Blank: continue
    except Exception as e:
        print("".join(traceback.format_exception(*sys.exc_info())))