py_gen/templates/_unpack.py

:: # Copyright 2013, Big Switch Networks, Inc.
:: #
:: # LoxiGen is licensed under the Eclipse Public License, version 1.0 (EPL), with
:: # the following special exception:
:: #
:: # LOXI Exception
:: #
:: # As a special exception to the terms of the EPL, you may distribute libraries
:: # generated by LoxiGen (LoxiGen Libraries) under the terms of your choice, provided
:: # that copyright and licensing notices generated by LoxiGen are not altered or removed
:: # from the LoxiGen Libraries and the notice provided below is (i) included in
:: # the LoxiGen Libraries, if distributed in source code form and (ii) included in any
:: # documentation for the LoxiGen Libraries, if distributed in binary form.
:: #
:: # Notice: "Copyright 2013, Big Switch Networks, Inc. This library was generated by the LoxiGen Compiler."
:: #
:: # You may not use this file except in compliance with the EPL or LOXI Exception. You may obtain
:: # a copy of the EPL at:
:: #
:: # http://www.eclipse.org/legal/epl-v10.html
:: #
:: # Unless required by applicable law or agreed to in writing, software
:: # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
:: # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
:: # EPL for the specific language governing permissions and limitations
:: # under the EPL.
::
:: # TODO coalesce format strings
:: from py_gen.codegen import Member, LengthMember, TypeMember, PadMember
:: for m in ofclass.members:
::     if type(m) == PadMember:
::         continue
::     #endif
::     unpack_expr = m.oftype.gen_unpack_expr('buf', m.offset)
::     if type(m) == LengthMember:
        _length = ${unpack_expr}
        assert(_length == len(buf))
:: if ofclass.is_fixed_length:
        if _length != ${ofclass.min_length}: raise loxi.ProtocolError("${ofclass.pyname} length is %d, should be ${ofclass.min_length}" % _length)
:: else:
        if _length < ${ofclass.min_length}: raise loxi.ProtocolError("${ofclass.pyname} length is %d, should be at least ${ofclass.min_length}" % _length)
:: #endif
::     elif type(m) == TypeMember:
        ${m.name} = ${unpack_expr}
        assert(${m.name} == ${m.value})
::     else:
        obj.${m.name} = ${unpack_expr}
::     #endif
:: #endfor