283 lines
11 KiB
Python
283 lines
11 KiB
Python
#!/usr/bin/env python3
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# -*- Coding: UTF-8 -*-
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# ---------------------------------------------------------------------------
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# Open Asset Import Library (ASSIMP)
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# ---------------------------------------------------------------------------
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#
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# Copyright (c) 2006-2018, ASSIMP Development Team
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#
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# All rights reserved.
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#
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# Redistribution and use of this software in source and binary forms,
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# with or without modification, are permitted provided that the following
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# conditions are met:
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#
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# * Redistributions of source code must retain the above
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# copyright notice, this list of conditions and the
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# following disclaimer.
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#
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# * Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the
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# following disclaimer in the documentation and/or other
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# materials provided with the distribution.
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#
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# * Neither the name of the ASSIMP team, nor the names of its
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# contributors may be used to endorse or promote products
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# derived from this software without specific prior
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# written permission of the ASSIMP Development Team.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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# ---------------------------------------------------------------------------
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"""Generate the C++ glue code needed to map EXPRESS to C++"""
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import sys, os, re
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if sys.version_info < (3, 0):
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print("must use python 3.0 or greater")
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sys.exit(-2)
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input_template_h = 'IFCReaderGen.h.template'
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input_template_cpp = 'IFCReaderGen.cpp.template'
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output_file_h = os.path.join('..','..','code','IFCReaderGen.h')
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output_file_cpp = os.path.join('..','..','code','IFCReaderGen.cpp')
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template_entity_predef = '\tstruct {entity};\n'
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template_entity_predef_ni = '\ttypedef NotImplemented {entity}; // (not currently used by Assimp)\n'
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template_entity = r"""
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// C++ wrapper for {entity}
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struct {entity} : {parent} ObjectHelper<{entity},{argcnt}> {{ {entity}() : Object("{entity}") {{}}
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{fields}
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}};"""
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template_entity_ni = ''
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template_type = r"""
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// C++ wrapper type for {type}
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typedef {real_type} {type};"""
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template_stub_decl = '\tDECL_CONV_STUB({type});\n'
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template_schema = '\t\tSchemaEntry("{normalized_name}",&STEP::ObjectHelper<{type},{argcnt}>::Construct )\n'
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template_schema_type = '\t\tSchemaEntry("{normalized_name}",NULL )\n'
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template_converter = r"""
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// -----------------------------------------------------------------------------------------------------------
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template <> size_t GenericFill<{type}>(const DB& db, const LIST& params, {type}* in)
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{{
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{contents}
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}}"""
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template_converter_prologue_a = '\tsize_t base = GenericFill(db,params,static_cast<{parent}*>(in));\n'
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template_converter_prologue_b = '\tsize_t base = 0;\n'
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template_converter_check_argcnt = '\tif (params.GetSize() < {max_arg}) {{ throw STEP::TypeError("expected {max_arg} arguments to {name}"); }}'
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template_converter_code_per_field = r""" do {{ // convert the '{fieldname}' argument
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boost::shared_ptr<const DataType> arg = params[base++];{handle_unset}{convert}
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}} while(0);
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"""
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template_allow_optional = r"""
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if (dynamic_cast<const UNSET*>(&*arg)) break;"""
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template_allow_derived = r"""
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if (dynamic_cast<const ISDERIVED*>(&*arg)) {{ in->ObjectHelper<Assimp::IFC::{type},{argcnt}>::aux_is_derived[{argnum}]=true; break; }}"""
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template_convert_single = r"""
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try {{ GenericConvert( in->{name}, arg, db ); break; }}
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catch (const TypeError& t) {{ throw TypeError(t.what() + std::string(" - expected argument {argnum} to {classname} to be a `{full_type}`")); }}"""
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template_converter_omitted = '// this data structure is not used yet, so there is no code generated to fill its members\n'
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template_converter_epilogue = '\treturn base;'
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import ExpressReader
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def get_list_bounds(collection_spec):
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start,end = [(int(n) if n!='?' else 0) for n in re.findall(r'(\d+|\?)',collection_spec)]
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return start,end
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def get_cpp_type(field,schema):
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isobjref = field.type in schema.entities
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base = field.type
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if isobjref:
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base = 'Lazy< '+(base if base in schema.whitelist else 'NotImplemented')+' >'
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if field.collection:
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start,end = get_list_bounds(field.collection)
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base = 'ListOf< {0}, {1}, {2} >'.format(base,start,end)
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if not isobjref:
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base += '::Out'
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if field.optional:
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base = 'Maybe< '+base+' >'
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return base
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def generate_fields(entity,schema):
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fields = []
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for e in entity.members:
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fields.append('\t\t{type} {name};'.format(type=get_cpp_type(e,schema),name=e.name))
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return '\n'.join(fields)
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def handle_unset_args(field,entity,schema,argnum):
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n = ''
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# if someone derives from this class, check for derived fields.
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if any(entity.name==e.parent for e in schema.entities.values()):
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n += template_allow_derived.format(type=entity.name,argcnt=len(entity.members),argnum=argnum)
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if not field.optional:
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return n+''
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return n+template_allow_optional.format()
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def get_single_conversion(field,schema,argnum=0,classname='?'):
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typen = field.type
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name = field.name
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if field.collection:
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typen = 'LIST'
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return template_convert_single.format(type=typen,name=name,argnum=argnum,classname=classname,full_type=field.fullspec)
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def count_args_up(entity,schema):
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return len(entity.members) + (count_args_up(schema.entities[entity.parent],schema) if entity.parent else 0)
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def resolve_base_type(base,schema):
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if base in ('INTEGER','REAL','STRING','ENUMERATION','BOOLEAN','NUMBER', 'SELECT','LOGICAL'):
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return base
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if base in schema.types:
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return resolve_base_type(schema.types[base].equals,schema)
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print(base)
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return None
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def gen_type_struct(typen,schema):
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base = resolve_base_type(typen.equals,schema)
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if not base:
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return ''
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if typen.aggregate:
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start,end = get_list_bounds(typen.aggregate)
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base = 'ListOf< {0}, {1}, {2} >'.format(base,start,end)
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return template_type.format(type=typen.name,real_type=base)
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def gen_converter(entity,schema):
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max_arg = count_args_up(entity,schema)
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arg_idx = arg_idx_ofs = max_arg - len(entity.members)
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code = template_converter_prologue_a.format(parent=entity.parent) if entity.parent else template_converter_prologue_b
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if entity.name in schema.blacklist_partial:
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return code+template_converter_omitted+template_converter_epilogue;
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if max_arg > 0:
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code +=template_converter_check_argcnt.format(max_arg=max_arg,name=entity.name)
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for field in entity.members:
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code += template_converter_code_per_field.format(fieldname=field.name,
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handle_unset=handle_unset_args(field,entity,schema,arg_idx-arg_idx_ofs),
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convert=get_single_conversion(field,schema,arg_idx,entity.name))
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arg_idx += 1
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return code+template_converter_epilogue
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def get_base_classes(e,schema):
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def addit(e,out):
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if e.parent:
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out.append(e.parent)
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addit(schema.entities[e.parent],out)
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res = []
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addit(e,res)
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return list(reversed(res))
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def get_derived(e,schema):
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def get_deriv(e,out): # bit slow, but doesn't matter here
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s = [ee for ee in schema.entities.values() if ee.parent == e.name]
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for sel in s:
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out.append(sel.name)
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get_deriv(sel,out)
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res = []
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get_deriv(e,res)
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return res
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def get_hierarchy(e,schema):
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return get_derived(e.schema)+[e.name]+get_base_classes(e,schema)
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def sort_entity_list(schema):
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deps = []
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entities = schema.entities
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for e in entities.values():
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deps += get_base_classes(e,schema)+[e.name]
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checked = []
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for e in deps:
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if e not in checked:
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checked.append(e)
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return [entities[e] for e in checked]
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def work(filename):
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schema = ExpressReader.read(filename,silent=True)
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entities, stub_decls, schema_table, converters, typedefs, predefs = '','',[],'','',''
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whitelist = []
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with open('entitylist.txt', 'rt') as inp:
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whitelist = [n.strip() for n in inp.read().split('\n') if n[:1]!='#' and n.strip()]
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schema.whitelist = set()
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schema.blacklist_partial = set()
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for ename in whitelist:
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try:
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e = schema.entities[ename]
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except KeyError:
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# type, not entity
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continue
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for base in [e.name]+get_base_classes(e,schema):
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schema.whitelist.add(base)
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for base in get_derived(e,schema):
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schema.blacklist_partial.add(base)
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schema.blacklist_partial -= schema.whitelist
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schema.whitelist |= schema.blacklist_partial
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# uncomment this to disable automatic code reduction based on whitelisting all used entities
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# (blacklisted entities are those who are in the whitelist and may be instanced, but will
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# only be accessed through a pointer to a base-class.
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#schema.whitelist = set(schema.entities.keys())
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#schema.blacklist_partial = set()
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for ntype in schema.types.values():
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typedefs += gen_type_struct(ntype,schema)
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schema_table.append(template_schema_type.format(normalized_name=ntype.name.lower()))
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sorted_entities = sort_entity_list(schema)
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for entity in sorted_entities:
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parent = entity.parent+',' if entity.parent else ''
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if entity.name in schema.whitelist:
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converters += template_converter.format(type=entity.name,contents=gen_converter(entity,schema))
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schema_table.append(template_schema.format(type=entity.name,normalized_name=entity.name.lower(),argcnt=len(entity.members)))
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entities += template_entity.format(entity=entity.name,argcnt=len(entity.members),parent=parent,fields=generate_fields(entity,schema))
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predefs += template_entity_predef.format(entity=entity.name)
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stub_decls += template_stub_decl.format(type=entity.name)
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else:
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entities += template_entity_ni.format(entity=entity.name)
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predefs += template_entity_predef_ni.format(entity=entity.name)
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schema_table.append(template_schema.format(type="NotImplemented",normalized_name=entity.name.lower(),argcnt=0))
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schema_table = ','.join(schema_table)
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with open(input_template_h,'rt') as inp:
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with open(output_file_h,'wt') as outp:
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# can't use format() here since the C++ code templates contain single, unescaped curly brackets
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outp.write(inp.read().replace('{predefs}',predefs).replace('{types}',typedefs).replace('{entities}',entities).replace('{converter-decl}',stub_decls))
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with open(input_template_cpp,'rt') as inp:
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with open(output_file_cpp,'wt') as outp:
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outp.write(inp.read().replace('{schema-static-table}',schema_table).replace('{converter-impl}',converters))
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if __name__ == "__main__":
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sys.exit(work(sys.argv[1] if len(sys.argv)>1 else 'schema.exp'))
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