mirror of
https://github.com/kanaka/mal.git
synced 2024-09-20 10:07:45 +03:00
62 lines
1.5 KiB
Python
62 lines
1.5 KiB
Python
import sys, traceback
|
|
import mal_readline
|
|
import mal_types as types
|
|
import reader, printer
|
|
|
|
# read
|
|
def READ(str):
|
|
return reader.read_str(str)
|
|
|
|
# eval
|
|
def eval_ast(ast, env):
|
|
if types._symbol_Q(ast):
|
|
try:
|
|
return env[ast]
|
|
except:
|
|
raise Exception("'" + ast + "' not found")
|
|
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" % ast)
|
|
if not types._list_Q(ast):
|
|
return eval_ast(ast, env)
|
|
|
|
# apply list
|
|
el = eval_ast(ast, env)
|
|
f = el[0]
|
|
return f(*el[1:])
|
|
|
|
def PRINT(exp):
|
|
return printer._pr_str(exp)
|
|
|
|
# repl
|
|
repl_env = {}
|
|
def REP(str):
|
|
return PRINT(EVAL(READ(str), repl_env))
|
|
|
|
repl_env['+'] = lambda a,b: a+b
|
|
repl_env['-'] = lambda a,b: a-b
|
|
repl_env['*'] = lambda a,b: a*b
|
|
repl_env['/'] = lambda a,b: int(a/b)
|
|
|
|
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())))
|