def assoc(args):
src_hm, key_vals = args[0], args.rest()
new_dct = src_hm.dct.copy()
for i in range(0,len(key_vals),2):
k = key_vals[i]
if not isinstance(k, MalStr):
throw_str("assoc called with non-string/non-keyword key")
new_dct[k.value] = key_vals[i+1]
return MalHashMap(new_dct)
def dissoc(args):
src_hm, keys = args[0], args.rest()
new_dct = src_hm.dct.copy()
for k in keys.values:
if not isinstance(k, MalStr):
throw_str("dissoc called with non-string/non-keyword key")
if k.value in new_dct:
del new_dct[k.value]
return MalHashMap(new_dct)
def eval_ast(ast, env):
if types._symbol_Q(ast):
assert isinstance(ast, MalSym)
return env.get(ast)
elif types._list_Q(ast):
res = []
for a in ast.values:
res.append(EVAL(a, env))
return MalList(res)
elif types._vector_Q(ast):
res = []
for a in ast.values:
res.append(EVAL(a, env))
return MalVector(res)
elif types._hash_map_Q(ast):
new_dct = {}
for k in ast.dct.keys():
new_dct[k] = EVAL(ast.dct[k], env)
return MalHashMap(new_dct)
else:
return ast # primitive value, return unchanged
def EVAL(ast, env):
while True:
#print("EVAL %s" % printer._pr_str(ast))
if types._symbol_Q(ast):
assert isinstance(ast, MalSym)
return env.get(ast)
elif types._vector_Q(ast):
res = []
for a in ast.values:
res.append(EVAL(a, env))
return MalVector(res)
elif types._hash_map_Q(ast):
new_dct = {}
for k in ast.dct.keys():
new_dct[k] = EVAL(ast.dct[k], env)
return MalHashMap(new_dct)
elif not types._list_Q(ast):
return ast # primitive value, return unchanged
else:
# apply list
if len(ast) == 0: return ast
a0 = ast[0]
if isinstance(a0, MalSym):
a0sym = a0.value
else:
a0sym = u"__<*fn*>__"
if u"def!" == a0sym:
a1, a2 = ast[1], ast[2]
res = EVAL(a2, env)
return env.set(a1, res)
elif u"let*" == a0sym:
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))
ast = a2
env = let_env # Continue loop (TCO)
elif u"quote" == a0sym:
return ast[1]
elif u"quasiquote" == a0sym:
ast = quasiquote(ast[1]) # Continue loop (TCO)
elif u"defmacro!" == a0sym:
func = EVAL(ast[2], env)
func.ismacro = True
return env.set(ast[1], func)
elif u"try*" == a0sym:
if len(ast) < 3:
return EVAL(ast[1], env)
a1, a2 = ast[1], ast[2]
a20 = a2[0]
if isinstance(a20, MalSym):
if a20.value == u"catch*":
try:
return EVAL(a1, env)
except types.MalException as exc:
exc = exc.object
catch_env = Env(env, _list(a2[1]), _list(exc))
return EVAL(a2[2], catch_env)
except Exception as exc:
exc = MalStr(unicode("%s" % exc))
catch_env = Env(env, _list(a2[1]), _list(exc))
return EVAL(a2[2], catch_env)
return EVAL(a1, env)
elif u"do" == a0sym:
if len(ast) == 0:
return nil
for i in range(1, len(ast) - 1):
EVAL(ast[i], env)
ast = ast[-1] # Continue loop (TCO)
elif u"if" == a0sym:
a1, a2 = ast[1], ast[2]
cond = EVAL(a1, env)
if cond is nil or cond is false:
if len(ast) > 3: ast = ast[3] # Continue loop (TCO)
else: return nil
else:
ast = a2 # Continue loop (TCO)
elif u"fn*" == a0sym:
a1, a2 = ast[1], ast[2]
return MalFunc(None, a2, env, a1, EVAL)
else:
f = EVAL(a0, env)
args = ast.rest()
if f.ismacro:
ast = f.apply(ast.rest()) # Continue loop (TCO)
else:
res = []
for a in args.values:
res.append(EVAL(a, env))
el = MalList(res)
if isinstance(f, MalFunc):
if f.ast:
ast = f.ast
env = f.gen_env(el) # Continue loop (TCO)
else:
return f.apply(el)
else:
raise Exception("%s is not callable" % f)