def strong_eval_value(self, value):
if value.is_thunk():
for v in self.strong_eval_expression(value.expr, value.env):
yield v
elif value.is_integer_constant():
yield value
elif value.is_closure():
yield value
elif value.is_primitive():
for part in self.strong_eval_expression(value.args):
yield values.Primitive(value.name, vargs)
elif value.is_rigid_structure():
for vargs in self.strong_eval_values(value.args):
yield values.RigidStructure(value.constructor, vargs)
elif value.is_flex_structure():
for vargs in self.strong_eval_values(value.args):
if value.is_decided():
yield values.FlexStructure(value.symbol, vargs)
else:
for v in self.apply_many(value.symbol.representative(),
vargs):
yield from self.strong_eval_value(v)
else:
raise Exception(
'Strong evaluation not implemented for {cls}.'.format(
cls=type(value)))
def eval_variable_or_constructor(self, expr, env):
if env.is_defined(expr.name):
yield from self.eval_defined_variable_or_constructor(expr, env)
else:
yield (
values.RigidStructure(expr.name, []) if expr.name
in self._constructors else values.Primitive(expr.name, [])
if expr.name in self._primitives else exception_with(
'Name {name} is not a variable nor a constructor.'.format(
name=expr.name)))
def apply_primitive(self, value, varg):
assert value.name in self._primitives
vargs = value.args + [varg]
if len(vargs) < self._primitives[value.name].arity:
yield values.Primitive(value.name, vargs)
return
yield from (
self.primitive_sequence(*vargs) if value.name == common.OP_SEQUENCE
else self.primitive_alternative(*vargs)
if value.name == common.OP_ALTERNATIVE else self.primitive_unify(
*vargs) if value.name == common.OP_UNIFY else exception_with(
'Primitive "{name}" not implemented.'.format(
name=value.name)))
def eval_variable_or_constructor(self, expr, env):
if env.is_defined(expr.name):
value0 = env.value(expr.name)
for value in self.eval_value(value0):
env.set(expr.name, value)
yield value
env.set(expr.name, value0)
elif expr.name in self._constructors:
yield values.RigidStructure(expr.name, [])
elif expr.name in self._primitives:
yield values.Primitive(expr.name, [])
else:
raise Exception(
'Name {name} is not a variable nor a constructor.'.format(
name=expr.name))
def strong_eval_primitives(self, value):
for vargs in self.strong_eval_values(value.args):
yield values.Primitive(value.name, vargs)
