def create_table(self, narr, nrec):
table = LuaTable(narr, nrec)
self.stack.push(table)
class LuaState:
def __init__(self):
self.stack = LuaStack(self)
self.registry = LuaTable(0, 0)
self.registry.put(Consts.LUA_RIDX_GLOBALS, LuaTable(0, 0))
self.push_lua_stack(LuaStack(Consts.LUA_MIN_STACK))
def get_top(self):
return self.stack.top()
def abs_index(self, idx):
return self.stack.abs_index(idx)
def check_stack(self, n):
return self.stack.check(n)
def pop(self, n):
for i in range(n):
self.stack.pop()
def copy(self, src, dst):
self.stack.set(dst, self.stack.get(src))
def push_value(self, idx):
self.stack.push(self.stack.get(idx))
def replace(self, idx):
self.stack.set(idx, self.stack.pop())
def insert(self, idx):
self.rotate(idx, 1)
def remove(self, idx):
self.rotate(idx, -1)
self.pop(1)
def rotate(self, idx, n):
t = self.stack.top() - 1
p = self.stack.abs_index(idx) - 1
m = t - n if n >= 0 else p - n - 1
self.stack.reverse(p, m)
self.stack.reverse(m + 1, t)
self.stack.reverse(p, t)
def set_top(self, idx):
new_top = self.stack.abs_index(idx)
assert (new_top >= 0)
n = self.stack.top() - new_top
if n > 0:
for i in range(n):
self.stack.pop()
elif n < 0:
for i in range(-n):
self.stack.push(None)
@staticmethod
def type_name(tp):
if tp == LuaType.NONE:
return 'no value'
elif tp == LuaType.NIL:
return 'nil'
elif tp == LuaType.BOOLEAN:
return 'boolean'
elif tp == LuaType.NUMBER:
return 'number'
elif tp == LuaType.STRING:
return 'string'
elif tp == LuaType.TABLE:
return 'table'
elif tp == LuaType.FUNCTION:
return 'function'
elif tp == LuaType.THREAD:
return 'thread'
elif tp == LuaType.USER_DATA:
return 'userdata'
def type(self, idx):
if self.stack.is_valid(idx):
return LuaValue.type_of(self.stack.get(idx))
return LuaType.NONE
def is_none(self, idx):
return self.type(idx) == LuaType.NONE
def is_nil(self, idx):
return self.type(idx) == LuaType.NIL
def is_none_or_nil(self, idx):
return self.is_none(idx) or self.is_nil(idx)
def is_boolean(self, idx):
return self.type(idx) == LuaType.BOOLEAN
def is_integer(self, idx):
return isinstance(self.stack.get(idx), int)
def is_number(self, idx):
return self.to_number(idx) is not None
def is_string(self, idx):
tp = self.type(idx)
return tp == LuaType.STRING or tp == LuaType.NUMBER
def is_table(self, idx):
return self.type(idx) == LuaType.TABLE
def is_thread(self, idx):
return self.type(idx) == LuaType.THREAD
def is_function(self, idx):
return self.type(idx) == LuaType.FUNCTION
def to_boolean(self, idx):
return LuaValue.to_boolean(self.stack.get(idx))
def to_integer(self, idx):
i = self.to_integerx(idx)
return 0 if i is None else i
def to_integerx(self, idx):
val = self.stack.get(idx)
return val if isinstance(val, int) else None
def to_number(self, idx):
val = self.stack.get(idx)
if isinstance(val, float):
return val
elif isinstance(val, int):
return float(val)
return 0
def to_string(self, idx):
val = self.stack.get(idx)
if isinstance(val, str):
return val
elif isinstance(val, int) or isinstance(val, float):
s = str(val)
self.stack.set(idx, s)
return s
return ''
def push_nil(self):
self.stack.push(None)
def push_boolean(self, b):
self.stack.push(b)
def push_integer(self, n):
self.stack.push(n)
def push_number(self, n):
self.stack.push(n)
def push_string(self, s):
self.stack.push(s)
def print_stack(self):
top = self.stack.top()
for i in range(1, top + 1):
t = self.type(i)
if t == LuaType.BOOLEAN:
print('[%s]' % ('true' if self.to_boolean(i) else 'false'),
end='')
elif t == LuaType.NUMBER:
if self.is_integer(i):
print('[%d]' % self.to_integer(i), end='')
else:
print('[%g]' % self.to_number(i), end='')
elif t == LuaType.STRING:
print('["%s"]' % self.to_string(i), end='')
else:
print('[%s]' % LuaState.type_name(t), end='')
print()
def arith(self, op):
b = self.stack.pop()
a = self.stack.pop() if (op != ArithOp.UNM
and op != ArithOp.BNOT) else b
result = Arithmetic.arith(a, op, b)
assert (result is not None)
self.stack.push(result)
def len(self, idx):
val = self.stack.get(idx)
assert (val is not None)
if isinstance(val, str) or isinstance(val, LuaTable):
self.stack.push(len(val))
else:
raise Exception('length error')
def concat(self, n):
if n == 0:
self.stack.push('')
elif n >= 2:
for i in range(1, n):
assert (self.is_string(-1) and self.is_string(-2))
s2 = self.to_string(-1)
s1 = self.to_string(-2)
self.stack.pop()
self.stack.pop()
self.stack.push(s1 + s2)
def compare(self, idx1, op, idx2):
if not self.stack.is_valid(idx1) or not self.stack.is_valid(idx2):
return False
a = self.stack.get(idx1)
b = self.stack.get(idx2)
if op == CmpOp.EQ:
return Compare.eq(a, b)
elif op == CmpOp.LT:
return Compare.lt(a, b)
elif op == CmpOp.LE:
return Compare.le(a, b)
# vm
def get_pc(self):
return self.stack.pc
def add_pc(self, n):
self.stack.pc += n
def fetch(self):
code = self.stack.closure.proto.get_code()[self.stack.pc]
self.stack.pc += 1
return code
def get_const(self, idx):
self.stack.push(self.stack.closure.proto.get_constants()[idx])
def get_rk(self, rk):
if rk > 0xff: # constant
self.get_const(rk & 0xff)
else: # register
self.push_value(rk + 1)
# table
def create_table(self, narr, nrec):
table = LuaTable(narr, nrec)
self.stack.push(table)
@staticmethod
def get_table_val(t, k):
if isinstance(t, LuaTable):
return t.get(k)
raise Exception('not a table')
def get_table(self, idx):
t = self.stack.get(idx)
k = self.stack.pop()
v = LuaState.get_table_val(t, k)
self.stack.push(v)
return LuaValue.type_of(v)
def get_i(self, idx, i):
t = self.stack.get(idx)
v = LuaState.get_table_val(t, i)
self.stack.push(v)
return LuaValue.type_of(v)
def set_table(self, idx):
t = self.stack.get(idx)
v = self.stack.pop()
k = self.stack.pop()
LuaState.set_table_kv(t, k, v)
@staticmethod
def set_table_kv(t, k, v):
if isinstance(t, LuaTable):
t.put(k, v)
return
raise Exception('not a table')
def set_field(self, idx, k):
t = self.stack.get(idx)
v = self.stack.pop()
LuaState.set_table_kv(t, k, v)
def set_i(self, idx, i):
t = self.stack.get(idx)
v = self.stack.pop()
LuaState.set_table_kv(t, i, v)
def load(self, chunk):
bc = BinaryChunk(chunk)
proto = bc.undump()
closure = Closure(proto, None)
self.stack.push(closure)
return ThreadStatus.OK
def call(self, nargs, nresults):
val = self.stack.get(-(nargs + 1))
if isinstance(val, Closure):
if val.proto:
self.call_lua_closure(nargs, nresults, val)
else:
self.call_py_closure(nargs, nresults, val)
else:
raise Exception('not function')
def call_lua_closure(self, nargs, nresults, c):
nregs = c.proto.get_max_stack_size()
nparams = c.proto.get_num_params()
is_vararg = c.proto.get_is_vararg()
# create new lua stack
new_stack = LuaStack(self)
new_stack.closure = c
# pass args, pop func
func_and_args = self.stack.popn(nargs + 1)
new_stack.pushn(func_and_args[1:], nparams)
if nargs > nparams and is_vararg:
new_stack.varargs = func_and_args[nparams + 1:]
# run closure
self.push_lua_stack(new_stack)
self.set_top(nregs)
self.run_lua_closure()
self.pop_lua_stack()
# return results
if nresults != 0:
results = new_stack.popn(new_stack.top() - nregs)
self.stack.check(len(results))
self.stack.pushn(results, nresults)
def run_lua_closure(self):
while True:
pc = self.get_pc() + 1
inst = Instruction(self.fetch())
inst.execute(self)
print('[%02d] %-12s ' % (pc, inst.op_name()), end='')
self.print_stack()
if inst.op_code() == OpCode.RETURN:
break
def push_lua_stack(self, s):
s.caller = self.stack
self.stack = s
def pop_lua_stack(self):
s = self.stack
self.stack = s.caller
s.caller = None
def register_count(self):
return self.stack.closure.proto.get_max_stack_size()
def load_vararg(self, n):
if n < 0:
n = len(self.stack.varargs)
self.stack.check(n)
self.stack.pushn(self.stack.varargs, n)
def load_proto(self, idx):
proto = self.stack.closure.proto.get_protos()[idx]
c = Closure(proto)
self.stack.push(c)
def push_py_function(self, func):
py_closure = Closure(None, func)
self.stack.push(py_closure)
def is_py_function(self, idx):
val = self.stack.get(idx)
return val and isinstance(val, Closure) and val.py_func is not None
def to_py_function(self, idx):
val = self.stack.get(idx)
if val and isinstance(val, Closure) and val.py_func is not None:
return val.py_func
return None
def call_py_closure(self, nargs, nresults, c):
new_stack = LuaStack(self)
new_stack.closure = c
args = self.stack.popn(nargs)
new_stack.pushn(args, nargs)
self.stack.pop()
self.push_lua_stack(new_stack)
r = c.py_func(self)
self.pop_lua_stack()
if nresults != 0:
results = new_stack.popn(r)
self.stack.check(len(results))
self.stack.pushn(results, nresults)
def push_global_table(self):
g = self.registry.get(Consts.LUA_RIDX_GLOBALS)
self.stack.push(g)
def get_global(self, name):
t = self.registry.get(Consts.LUA_RIDX_GLOBALS)
return LuaState.get_table_val(t, name)
def set_global(self, name):
t = self.registry.get(Consts.LUA_RIDX_GLOBALS)
v = self.stack.pop()
LuaState.set_table_kv(t, name, v)
def register(self, name, func):
self.push_py_function(func)
self.set_global(name)
def __init__(self):
self.stack = LuaStack(self)
self.registry = LuaTable(0, 0)
self.registry.put(Consts.LUA_RIDX_GLOBALS, LuaTable(0, 0))
self.push_lua_stack(LuaStack(Consts.LUA_MIN_STACK))
class LuaState:
def __init__(self):
self.stack = LuaStack(self)
self.registry = LuaTable(0, 0)
self.registry.put(Consts.LUA_RIDX_GLOBALS, LuaTable(0, 0))
self.push_lua_stack(LuaStack(Consts.LUA_MIN_STACK))
self.time = 0
def get_top(self):
return self.stack.top()
def abs_index(self, idx):
return self.stack.abs_index(idx)
def check_stack(self, n):
return self.stack.check(n)
def pop(self, n):
for i in range(n):
self.stack.pop()
def copy(self, src, dst):
self.stack.set(dst, self.stack.get(src))
def push_value(self, idx):
self.stack.push(self.stack.get(idx))
def replace(self, idx):
self.stack.set(idx, self.stack.pop())
def insert(self, idx):
self.rotate(idx, 1)
def remove(self, idx):
self.rotate(idx, -1)
self.pop(1)
def rotate(self, idx, n):
t = self.stack.top() - 1
p = self.stack.abs_index(idx) - 1
m = t - n if n >= 0 else p - n - 1
self.stack.reverse(p, m)
self.stack.reverse(m + 1, t)
self.stack.reverse(p, t)
def set_top(self, idx):
new_top = self.stack.abs_index(idx)
assert (new_top >= 0)
n = self.stack.top() - new_top
if n > 0:
for i in range(n):
self.stack.pop()
elif n < 0:
for i in range(-n):
self.stack.push(None)
@staticmethod
def type_name(tp):
if tp == LuaType.NONE:
return 'no value'
elif tp == LuaType.NIL:
return 'nil'
elif tp == LuaType.BOOLEAN:
return 'boolean'
elif tp == LuaType.NUMBER:
return 'number'
elif tp == LuaType.STRING:
return 'string'
elif tp == LuaType.TABLE:
return 'table'
elif tp == LuaType.FUNCTION:
return 'function'
elif tp == LuaType.THREAD:
return 'thread'
elif tp == LuaType.USER_DATA:
return 'userdata'
def type(self, idx):
if self.stack.is_valid(idx):
return LuaValue.type_of(self.stack.get(idx))
return LuaType.NONE
def is_none(self, idx):
return self.type(idx) == LuaType.NONE
def is_nil(self, idx):
return self.type(idx) == LuaType.NIL
def is_none_or_nil(self, idx):
return self.is_none(idx) or self.is_nil(idx)
def is_boolean(self, idx):
return self.type(idx) == LuaType.BOOLEAN
def is_integer(self, idx):
return isinstance(self.stack.get(idx), int)
def is_number(self, idx):
return self.to_number(idx) is not None
def is_string(self, idx):
tp = self.type(idx)
return tp == LuaType.STRING or tp == LuaType.NUMBER
def is_table(self, idx):
return self.type(idx) == LuaType.TABLE
def is_thread(self, idx):
return self.type(idx) == LuaType.THREAD
def is_function(self, idx):
return self.type(idx) == LuaType.FUNCTION
def to_boolean(self, idx):
return LuaValue.to_boolean(self.stack.get(idx))
def to_integer(self, idx):
i = self.to_integerx(idx)
return 0 if i is None else i
def to_integerx(self, idx):
val = self.stack.get(idx)
return val if isinstance(val, int) else None
def to_number(self, idx):
val = self.stack.get(idx)
if isinstance(val, float):
return val
elif isinstance(val, int):
return float(val)
return 0
def to_string(self, idx):
val = self.stack.get(idx)
if isinstance(val, str):
return val
elif isinstance(val, int) or isinstance(val, float):
s = str(val)
self.stack.set(idx, s)
return s
return ''
def push_nil(self):
self.stack.push(None)
def push_boolean(self, b):
self.stack.push(b)
def push_integer(self, n):
self.stack.push(n)
def push_number(self, n):
self.stack.push(n)
def push_string(self, s):
self.stack.push(s)
def print_stack(self):
top = self.stack.top()
for i in range(1, top + 1):
t = self.type(i)
if t == LuaType.BOOLEAN:
print('[%s]' % ('true' if self.to_boolean(i) else 'false'),
end='')
elif t == LuaType.NUMBER:
if self.is_integer(i):
print('[%d]' % self.to_integer(i), end='')
else:
print('[%g]' % self.to_number(i), end='')
elif t == LuaType.STRING:
print('["%s"]' % self.to_string(i), end='')
else:
print('[%s]' % LuaState.type_name(t), end='')
print()
def arith(self, op):
b = self.stack.pop()
a = self.stack.pop() if (op != ArithOp.UNM
and op != ArithOp.BNOT) else b
result = Arithmetic.arith(a, op, b)
if result is None:
name = Arithmetic.operators[op].metamethod
metamethod = self.get_metamethod(a, b, name)
result = self.call_metamethod(a, metamethod,
b) if metamethod else None
assert (result is not None)
self.stack.push(result)
def len(self, idx):
val = self.stack.get(idx)
assert (val is not None)
if isinstance(val, str):
self.stack.push(len(val))
return
metamethod = self.get_metamethod(val, val, '__len')
if metamethod is not None:
self.stack.push(self.call_metamethod(val, metamethod, val))
return
if isinstance(val, LuaTable):
self.stack.push(len(val))
return
raise Exception('length error')
def concat(self, n):
if n == 0:
self.stack.push('')
elif n >= 2:
for i in range(1, n):
if self.is_string(-1) and self.is_string(-2):
s2 = self.to_string(-1)
s1 = self.to_string(-2)
self.stack.pop()
self.stack.pop()
self.stack.push(s1 + s2)
continue
b = self.stack.pop()
a = self.stack.pop()
mm = self.get_metamethod(a, b, '__concat')
if mm:
self.stack.push(self.call_metamethod(a, mm, b))
continue
raise Exception('concatenation error!')
def compare(self, idx1, op, idx2):
if not self.stack.is_valid(idx1) or not self.stack.is_valid(idx2):
return False
a = self.stack.get(idx1)
b = self.stack.get(idx2)
if op == CmpOp.EQ:
return Compare.eq(a, b, self)
elif op == CmpOp.LT:
return Compare.lt(a, b, self)
elif op == CmpOp.LE:
return Compare.le(a, b, self)
# vm
def get_pc(self):
return self.stack.pc
def add_pc(self, n):
self.stack.pc += n
def fetch(self):
code = self.stack.closure.proto.get_code()[self.stack.pc]
self.stack.pc += 1
return code
def get_const(self, idx):
self.stack.push(self.stack.closure.proto.get_constants()[idx])
def get_rk(self, rk):
if rk > 0xff: # constant
self.get_const(rk & 0xff)
else: # register
self.push_value(rk + 1)
# table
def create_table(self, narr, nrec):
table = LuaTable(narr, nrec)
self.stack.push(table)
def get_table_val(self, t, k, raw):
if isinstance(t, LuaTable):
v = t.get(k)
if raw or (v is not None) or (not t.has_metafield('__index')):
return v
if not raw:
mf = self.get_metafield(t, '__index')
if mf:
if isinstance(mf, LuaTable):
return self.get_table_val(mf, k, False)
elif isinstance(mf, Closure):
v = self.call_metamethod(t, mf, k)
return v
raise Exception('not a table')
def get_table(self, idx):
t = self.stack.get(idx)
k = self.stack.pop()
v = self.get_table_val(t, k, False)
self.stack.push(v)
return LuaValue.type_of(v)
def get_i(self, idx, i):
t = self.stack.get(idx)
v = self.get_table_val(t, i, False)
self.stack.push(v)
return LuaValue.type_of(v)
def set_table(self, idx):
t = self.stack.get(idx)
v = self.stack.pop()
k = self.stack.pop()
self.set_table_kv(t, k, v, False)
def set_table_kv(self, t, k, v, raw):
if isinstance(t, LuaTable):
if raw or t.get(k) or not t.has_metafield('__newindex'):
t.put(k, v)
return
if not raw:
mf = self.get_metafield(t, '__newindex')
if mf:
if isinstance(mf, LuaTable):
self.set_table_kv(mf, k, v, False)
return
if isinstance(mf, Closure):
self.stack.push(mf)
self.stack.push(t)
self.stack.push(k)
self.stack.push(v)
self.call(3, 0)
return
raise Exception('not a table')
def set_field(self, idx, k):
t = self.stack.get(idx)
v = self.stack.pop()
self.set_table_kv(t, k, v, False)
def set_i(self, idx, i):
t = self.stack.get(idx)
v = self.stack.pop()
self.set_table_kv(t, i, v, False)
def load(self, chunk):
bc = BinaryChunk(chunk)
proto = bc.undump()
closure = Closure(proto, None, 0)
self.stack.push(closure)
if len(proto.upvalues) > 0:
env = self.registry.get(Consts.LUA_RIDX_GLOBALS)
closure.upvals[0] = env
print('env: ', end='')
env.dump()
return ThreadStatus.OK
def call(self, nargs, nresults):
val = self.stack.get(-(nargs + 1))
f = val if isinstance(val, Closure) else None
if f is None:
metamethod = self.get_metafield(val, '__call')
if metamethod and isinstance(metamethod, Closure):
self.stack.push(val)
self.insert(-(nargs + 2))
nargs += 1
f = metamethod
if f:
if f.proto:
self.call_lua_closure(nargs, nresults, f)
else:
self.call_py_closure(nargs, nresults, f)
else:
raise Exception(f, 'is not a function')
def call_lua_closure(self, nargs, nresults, c):
nregs = c.proto.get_max_stack_size()
nparams = c.proto.get_num_params()
is_vararg = c.proto.get_is_vararg()
# create new lua stack
new_stack = LuaStack(self)
new_stack.closure = c
# pass args, pop func
func_and_args = self.stack.popn(nargs + 1)
new_stack.pushn(func_and_args[1:], nparams)
if nargs > nparams and is_vararg:
new_stack.varargs = func_and_args[nparams + 1:]
# run closure
self.push_lua_stack(new_stack)
self.set_top(nregs)
self.run_lua_closure()
self.pop_lua_stack()
# return results
if nresults != 0:
results = new_stack.popn(new_stack.top() - nregs)
self.stack.check(len(results))
self.stack.pushn(results, nresults)
def run_lua_closure(self):
while True:
pc = self.get_pc() + 1
inst = Instruction(self.fetch())
inst.execute(self)
print('(%3d) [%02d] %-12s ' % (self.time, pc, inst.op_name()),
end='')
self.print_stack()
self.time += 1
if inst.op_code() == OpCode.RETURN:
break
def push_lua_stack(self, s):
s.caller = self.stack
self.stack = s
def pop_lua_stack(self):
s = self.stack
self.stack = s.caller
s.caller = None
def register_count(self):
return self.stack.closure.proto.get_max_stack_size()
def load_vararg(self, n):
if n < 0:
n = len(self.stack.varargs)
self.stack.check(n)
self.stack.pushn(self.stack.varargs, n)
def load_proto(self, idx):
proto = self.stack.closure.proto.get_protos()[idx]
c = Closure(proto, None, 0)
self.stack.push(c)
for i in range(len(proto.upvalues)):
upvalue = proto.get_upvalues()[i]
idx = upvalue.get_idx()
if upvalue.get_in_stack():
if idx not in self.stack.open_upvalues:
self.stack.open_upvalues[idx] = self.stack.slots[idx]
c.upvals[i] = self.stack.open_upvalues[idx]
else:
c.upvals[i] = self.stack.closure.upvals[idx]
def push_py_function(self, func):
py_closure = Closure(None, func, 0)
self.stack.push(py_closure)
def is_py_function(self, idx):
val = self.stack.get(idx)
return val and isinstance(val, Closure) and val.py_func is not None
def to_py_function(self, idx):
val = self.stack.get(idx)
if val and isinstance(val, Closure) and val.py_func is not None:
return val.py_func
return None
def call_py_closure(self, nargs, nresults, c):
new_stack = LuaStack(self)
new_stack.closure = c
args = self.stack.popn(nargs)
new_stack.pushn(args, nargs)
self.stack.pop()
self.push_lua_stack(new_stack)
r = c.py_func(self)
self.pop_lua_stack()
if nresults != 0:
results = new_stack.popn(r)
self.stack.check(len(results))
self.stack.pushn(results, nresults)
def push_global_table(self):
g = self.registry.get(Consts.LUA_RIDX_GLOBALS)
self.stack.push(g)
def get_global(self, name):
t = self.registry.get(Consts.LUA_RIDX_GLOBALS)
return self.get_table_val(t, name, False)
def set_global(self, name):
t = self.registry.get(Consts.LUA_RIDX_GLOBALS)
v = self.stack.pop()
self.set_table_kv(t, name, v, False)
def register(self, name, func):
self.push_py_function(func)
self.set_global(name)
def push_py_closure(self, py_func, n):
closure = Closure(None, py_func, n)
for i in range(n, 0, -1):
v = self.stack.pop()
closure.upvals[i - 1] = v
self.stack.push(closure)
def close_upvalues(self, a):
for k, v in self.stack.open_upvalues:
if k >= a - 1:
v.migrate()
self.stack.open_upvalues.pop(k)
def set_metatable(self, idx):
v = self.stack.get(idx)
mt = self.stack.pop()
if mt is None:
self.set_metatable_kv(v, None)
elif isinstance(mt, LuaTable):
self.set_metatable_kv(v, mt)
else:
raise Exception('table expected!')
def set_metatable_kv(self, val, mt):
if isinstance(val, LuaTable):
val.metatable = mt
else:
key = '_MT' + LuaValue.type_of(val)
self.registry.put(key, mt)
def get_metatable(self, idx):
v = self.stack.get(idx)
mt = self.get_metatable_k(v)
if mt:
self.stack.push(mt)
return True
else:
return False
def get_metatable_k(self, val):
if isinstance(val, LuaTable):
return val.metatable
else:
key = '_MT' + str(LuaValue.type_of(val))
return self.registry.get(key)
def call_metamethod(self, a, mm, b):
self.stack.push(mm)
self.stack.push(a)
self.stack.push(b)
self.call(2, 1)
return self.stack.pop()
def get_metafield(self, val, name):
mt = self.get_metatable_k(val)
if mt is not None:
return mt.get(name)
return None
def get_metamethod(self, a, b, name):
metamethod = self.get_metafield(a, name)
if not metamethod:
metamethod = self.get_metafield(b, name)
return metamethod
def next(self, idx):
t = self.stack.get(idx)
if isinstance(t, LuaTable):
key = self.stack.pop()
nextkey = t.next_key(key)
if nextkey:
self.stack.push(nextkey)
self.stack.push(t.get(nextkey))
return True
return False
raise Exception("table expected!")