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Copy pathConstructedDataTypes.py
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139 lines (127 loc) · 5.68 KB
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# Copyright (c) 2011, Thomas Paviot (tpaviot@gmail.com)
# All rights reserved.
# This file is part of the StepClassLibrary (SCL).
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# Neither the name of the <ORGANIZATION> nor the names of its contributors may
# be used to endorse or promote products derived from this software without
# specific prior written permission.
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.
# IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
import sys
import BaseType
class EnumerationId(object):
"""
EXPRESS definition:
===================
An enumeration data type has as its domain an ordered set of names. The names represent
values of the enumeration data type. These names are designated by enumeration_ids and are
referred to as enumeration items.
"""
pass
class ENUMERATION(object):
"""
EXPRESS definition:
===================
An ENUMERATION data type has as its domain an ordered set of names. The names represent
values of the enumeration data type.
Python implementation:
======================
An enumeration is initialized from strings defining the types.
For instance, some EXPRESS definition:
TYPE ahead_or_behind = ENUMERATION OF
(ahead,
behind);
END_TYPE; -- ahead_or_behind
is implemented in python with the line:
>>> ahead_of_behind = ENUMERATION('ahead','behind', the_current_scope)
>>> ahead_or_behind.ahead
>>> ahead_of_behind.behind
And, if and only if ahead and/or behind are not in scope (e.g. they are not entity names,
and/or many enums define the same enumeration identifier):
>>> ahead
>>> behind
"""
def __init__(self,*kargs,**args):
# first defining the scope
if args.has_key('scope'):
self._scope = args['scope']
else:
self._scope = None
# store passed enum identifiers
self._enum_id_names = list(kargs)
self._enum_ids = []
# we create enums id from names, and create attributes
# for instance, from the identifier name 'ahead',
# we create an attribute ahead with which is a new
# instance of EnumerationId
for enum_id_name in self._enum_id_names:
setattr(self,enum_id_name,EnumerationId())
# we store this new attributes to the enum_ids list, which
# will be accessed by the type checker with the get_enum_ids method
self._enum_ids.append(self.__getattribute__(enum_id_name))
#
# Then we check if the enums names can be added to the current scope:
# if the name is already in the scope, then another enums id or select
# has the same name -> we do nothing, enums will be called
# with ahead_of_behind.ahead or ahead_or_behind.behind.
# otherwise, they can be called as only ahead or behind
# Note: since ENUMERATIONS are defined *before* entities, if an entity
# has the same name as an enum id, it will replace it in the current scope.
#
for enum_id_name in self._enum_id_names:
if not vars(self._scope).has_key(enum_id_name):
vars(self._scope)[enum_id_name] = self.__getattribute__(enum_id_name)
def get_enum_ids(self):
return self._enum_ids
class SELECT(object):
""" A select data type has as its domain the union of the domains of the named data types in
its select list. The select data type is a generalization of each of the named data types in its
select list.
"""
def __init__(self,*kargs,**args):
# first defining the scope
if args.has_key('scope'):
self._scope = args['scope']
else:
self._scope = None
# create the types from the list of arguments
self._base_types = []
for types in list(kargs):
new_type = BaseType.Type(types,self._scope)
self._base_types.append(new_type)
def get_allowed_types(self):
_auth_types = []
for types in self._base_types:
_auth_types.append(types.get_type())
return _auth_types
def get_allowed_basic_types(self):
''' if a select contains some subselect, goes down through the different
sublayers untill there is no more '''
b = []
_auth_types = self.get_allowed_types()
for _auth_type in _auth_types:
if isinstance(_auth_type,SELECT) or isinstance(_auth_type,ENUMERATION):
h = _auth_type.get_allowed_types()
b.extend(h)
else:
b = _auth_types
return b