def link(code):
code = as_code(code)
free = free_vars(code)
to_bind = sorted(var for var in free if var[1].startswith('lib.'))
for var in to_bind:
code = bind(code, var)
return code
def context_pop(context, *terms):
if context.stack is not None:
arg, stack = context.stack
return arg, Context(stack, context.bound)
else:
avoid = frozenset()
for term in terms:
avoid |= free_vars(term)
arg = fresh(avoid)
bound = arg, context.bound
return arg, Context(context.stack, bound)
def _compile(self):
assert not hasattr(self, '_code')
var = NVAR('_{}'.format(self.__name__))
self._code = var
code = _compile(self, actual_fun=self._fun)
rec_code = try_abstract(var, code)
if rec_code is not None:
code = rec(rec_code)
free = free_vars(code)
if free:
raise SyntaxError('Unbound variables: {}'.format(
' '.join(v[1] for v in free)))
self._code = code
def test_free_vars(code, free):
assert free_vars(code) == frozenset(free)
def test_free_vars_runs(code):
free_vars(code)