228 lines
No EOL
11 KiB
Python
228 lines
No EOL
11 KiB
Python
# Things you can do:
|
|
# - Create/delete objects, associations, attributes
|
|
# - Change attribute values
|
|
# - ? that's it?
|
|
|
|
from uuid import UUID
|
|
from api.od import ODAPI, bind_api
|
|
from services.bottom.V0 import Bottom
|
|
from transformation import ramify
|
|
from services import od
|
|
from services.primitives.string_type import String
|
|
from services.primitives.actioncode_type import ActionCode
|
|
from services.primitives.integer_type import Integer
|
|
from util.eval import exec_then_eval, simply_exec
|
|
|
|
|
|
class TryAgainNextRound(Exception):
|
|
pass
|
|
|
|
# Rewrite is performed in-place (modifying `host_m`)
|
|
def rewrite(state, lhs_m: UUID, rhs_m: UUID, pattern_mm: UUID, lhs_match: dict, host_m: UUID, host_mm: UUID):
|
|
bottom = Bottom(state)
|
|
|
|
# Need to come up with a new, unique name when creating new element in host-model:
|
|
def first_available_name(prefix: str):
|
|
i = 0
|
|
while True:
|
|
name = prefix + str(i)
|
|
if len(bottom.read_outgoing_elements(host_m, name)) == 0:
|
|
return name # found unique name
|
|
i += 1
|
|
|
|
# function that can be called from within RHS action code
|
|
def matched_callback(pattern_name: str):
|
|
host_name = lhs_match[pattern_name]
|
|
return bottom.read_outgoing_elements(host_m, host_name)[0]
|
|
|
|
scd_metamodel_id = state.read_dict(state.read_root(), "SCD")
|
|
scd_metamodel = UUID(state.read_value(scd_metamodel_id))
|
|
|
|
class_type = od.get_scd_mm_class_node(bottom)
|
|
attr_link_type = od.get_scd_mm_attributelink_node(bottom)
|
|
assoc_type = od.get_scd_mm_assoc_node(bottom)
|
|
actioncode_type = od.get_scd_mm_actioncode_node(bottom)
|
|
modelref_type = od.get_scd_mm_modelref_node(bottom)
|
|
|
|
# To be replaced by ODAPI (below)
|
|
host_od = od.OD(host_mm, host_m, bottom.state)
|
|
rhs_od = od.OD(pattern_mm, rhs_m, bottom.state)
|
|
|
|
host_odapi = ODAPI(state, host_m, host_mm)
|
|
host_mm_odapi = ODAPI(state, host_mm, scd_metamodel)
|
|
rhs_odapi = ODAPI(state, rhs_m, pattern_mm)
|
|
rhs_mm_odapi = ODAPI(state, pattern_mm, scd_metamodel)
|
|
|
|
lhs_keys = lhs_match.keys()
|
|
rhs_keys = set(k for k in bottom.read_keys(rhs_m)
|
|
# extremely dirty - should think of a better way
|
|
if "GlobalCondition" not in k and not k.endswith("_condition") and not k.endswith(".condition"))
|
|
|
|
common = lhs_keys & rhs_keys
|
|
to_delete = lhs_keys - common
|
|
to_create = rhs_keys - common
|
|
|
|
# print("to_delete:", to_delete)
|
|
# print("to_create:", to_create)
|
|
|
|
# to be grown
|
|
rhs_match = { name : lhs_match[name] for name in common }
|
|
|
|
# 1. Perform creations - in the right order!
|
|
remaining_to_create = list(to_create)
|
|
while len(remaining_to_create) > 0:
|
|
next_round = []
|
|
for rhs_name in remaining_to_create:
|
|
# Determine the type of the thing to create
|
|
rhs_obj = rhs_odapi.get(rhs_name)
|
|
rhs_type = rhs_odapi.get_type(rhs_obj)
|
|
host_type = ramify.get_original_type(bottom, rhs_type)
|
|
# for debugging:
|
|
if host_type != None:
|
|
host_type_name = host_odapi.get_name(host_type)
|
|
else:
|
|
host_type_name = ""
|
|
|
|
def get_src_tgt():
|
|
src = rhs_odapi.get_source(rhs_obj)
|
|
tgt = rhs_odapi.get_target(rhs_obj)
|
|
src_name = rhs_odapi.get_name(src)
|
|
tgt_name = rhs_odapi.get_name(tgt)
|
|
try:
|
|
host_src_name = rhs_match[src_name]
|
|
host_tgt_name = rhs_match[tgt_name]
|
|
except KeyError:
|
|
# some creations (e.g., edges) depend on other creations
|
|
raise TryAgainNextRound()
|
|
host_src = host_odapi.get(host_src_name)
|
|
host_tgt = host_odapi.get(host_tgt_name)
|
|
return (host_src_name, host_tgt_name, host_src, host_tgt)
|
|
|
|
try:
|
|
if od.is_typed_by(bottom, rhs_type, class_type):
|
|
obj_name = first_available_name(rhs_name)
|
|
host_od._create_object(obj_name, host_type)
|
|
host_odapi._ODAPI__recompute_mappings()
|
|
rhs_match[rhs_name] = obj_name
|
|
elif od.is_typed_by(bottom, rhs_type, assoc_type):
|
|
_, _, host_src, host_tgt = get_src_tgt()
|
|
link_name = first_available_name(rhs_name)
|
|
host_od._create_link(link_name, host_type, host_src, host_tgt)
|
|
host_odapi._ODAPI__recompute_mappings()
|
|
rhs_match[rhs_name] = link_name
|
|
elif od.is_typed_by(bottom, rhs_type, attr_link_type):
|
|
host_src_name, _, host_src, host_tgt = get_src_tgt()
|
|
host_attr_link = ramify.get_original_type(bottom, rhs_type)
|
|
host_attr_name = host_mm_odapi.get_slot_value(host_attr_link, "name")
|
|
link_name = f"{host_src_name}_{host_attr_name}" # must follow naming convention here
|
|
host_od._create_link(link_name, host_type, host_src, host_tgt)
|
|
host_odapi._ODAPI__recompute_mappings()
|
|
rhs_match[rhs_name] = link_name
|
|
elif rhs_type == rhs_mm_odapi.get("ActionCode"):
|
|
# If we encounter ActionCode in our RHS, we assume that the code computes the value of an attribute...
|
|
# This will be the *value* of an attribute. The attribute-link (connecting an object to the attribute) will be created as an edge later.
|
|
|
|
# Problem: attributes must follow the naming pattern '<obj_name>.<attr_name>'
|
|
# So we must know the host-object-name, and the host-attribute-name.
|
|
# However, all we have access to here is the name of the attribute in the RHS.
|
|
# We cannot even see the link to the RHS-object.
|
|
# But, assuming the RHS-attribute is also named '<RAMified_obj_name>.<RAMified_attr_name>', we can:
|
|
rhs_src_name, rhs_attr_name = rhs_name.split('.')
|
|
try:
|
|
host_src_name = rhs_match[rhs_src_name]
|
|
except KeyError:
|
|
# unmet dependency - object to which attribute belongs not created yet
|
|
raise TryAgainNextRound()
|
|
rhs_src_type = rhs_odapi.get_type(rhs_odapi.get(rhs_src_name))
|
|
rhs_src_type_name = rhs_mm_odapi.get_name(rhs_src_type)
|
|
rhs_attr_link_name = f"{rhs_src_type_name}_{rhs_attr_name}"
|
|
rhs_attr_link = rhs_mm_odapi.get(rhs_attr_link_name)
|
|
host_attr_link = ramify.get_original_type(bottom, rhs_attr_link)
|
|
host_attr_name = host_mm_odapi.get_slot_value(host_attr_link, "name")
|
|
val_name = f"{host_src_name}.{host_attr_name}"
|
|
python_expr = ActionCode(UUID(bottom.read_value(rhs_obj)), bottom.state).read()
|
|
result = exec_then_eval(python_expr, _globals={
|
|
**bind_api(host_odapi),
|
|
'matched': matched_callback,
|
|
})
|
|
host_odapi.create_primitive_value(val_name, result, is_code=False)
|
|
rhs_match[rhs_name] = val_name
|
|
else:
|
|
rhs_type_name = rhs_odapi.get_name(rhs_type)
|
|
raise Exception(f"Host type {host_type_name} of pattern element '{rhs_name}:{rhs_type_name}' is not a class, association or attribute link. Don't know what to do with it :(")
|
|
except TryAgainNextRound:
|
|
next_round.append(rhs_name)
|
|
|
|
if len(next_round) == len(remaining_to_create):
|
|
raise Exception("Creation of objects did not make any progress - there must be some kind of cyclic dependency?!")
|
|
|
|
remaining_to_create = next_round
|
|
|
|
# 2. Perform updates (only on values)
|
|
for common_name in common:
|
|
host_obj_name = rhs_match[common_name]
|
|
host_obj = host_odapi.get(host_obj_name)
|
|
host_type = host_odapi.get_type(host_obj)
|
|
if od.is_typed_by(bottom, host_type, class_type):
|
|
# nothing to do
|
|
pass
|
|
elif od.is_typed_by(bottom, host_type, assoc_type):
|
|
# nothing to do
|
|
pass
|
|
elif od.is_typed_by(bottom, host_type, attr_link_type):
|
|
# nothing to do
|
|
pass
|
|
elif od.is_typed_by(bottom, host_type, modelref_type):
|
|
rhs_obj = rhs_odapi.get(common_name)
|
|
python_expr = ActionCode(UUID(bottom.read_value(rhs_obj)), bottom.state).read()
|
|
result = exec_then_eval(python_expr,
|
|
_globals={
|
|
**bind_api(host_odapi),
|
|
'matched': matched_callback,
|
|
},
|
|
_locals={'this': host_obj}) # 'this' can be used to read the previous value of the slot
|
|
host_odapi.overwrite_primitive_value(host_obj_name, result, is_code=False)
|
|
else:
|
|
msg = f"Don't know what to do with element '{common_name}' -> '{host_obj_name}:{host_type}')"
|
|
# print(msg)
|
|
raise Exception(msg)
|
|
|
|
# 3. Perform deletions
|
|
# This way, action code can read from elements that are deleted...
|
|
# Even better would be to not modify the model in-place, but use copy-on-write...
|
|
for pattern_name_to_delete in to_delete:
|
|
# For every name in `to_delete`, look up the name of the matched element in the host graph
|
|
model_el_name_to_delete = lhs_match[pattern_name_to_delete]
|
|
# print('deleting', model_el_name_to_delete)
|
|
# Look up the matched element in the host graph
|
|
el_to_delete, = bottom.read_outgoing_elements(host_m, model_el_name_to_delete)
|
|
# Delete
|
|
bottom.delete_element(el_to_delete)
|
|
|
|
# 4. Object-level actions
|
|
# Iterate over the (now complete) mapping RHS -> Host
|
|
for rhs_name, host_name in rhs_match.items():
|
|
host_obj = host_odapi.get(host_name)
|
|
rhs_obj = rhs_odapi.get(rhs_name)
|
|
rhs_type = rhs_odapi.get_type(rhs_obj)
|
|
rhs_type_of_type = rhs_mm_odapi.get_type(rhs_type)
|
|
rhs_type_of_type_name = rhs_mm_odapi.get_name(rhs_type_of_type)
|
|
if rhs_mm_odapi.cdapi.is_subtype(super_type_name="Class", sub_type_name=rhs_type_of_type_name):
|
|
# rhs_obj is an object or link (because association is subtype of class)
|
|
python_code = rhs_odapi.get_slot_value_default(rhs_obj, "condition", default="")
|
|
simply_exec(python_code,
|
|
_globals={
|
|
**bind_api(host_odapi),
|
|
'matched': matched_callback,
|
|
},
|
|
_locals={'this': host_obj})
|
|
|
|
# 5. Execute global actions
|
|
for cond_name, cond in rhs_odapi.get_all_instances("GlobalCondition"):
|
|
python_code = rhs_odapi.get_slot_value(cond, "condition")
|
|
simply_exec(python_code, _globals={
|
|
**bind_api(host_odapi),
|
|
'matched': matched_callback,
|
|
})
|
|
|
|
return rhs_match |