assimp/scripts/StepImporter/CppGenerator.py

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#!/usr/bin/env python3
# -*- Coding: UTF-8 -*-
# ---------------------------------------------------------------------------
# Open Asset Import Library (ASSIMP)
# ---------------------------------------------------------------------------
#
# Copyright (c) 2006-2018, ASSIMP Development Team
#
# All rights reserved.
#
# Redistribution and use of this software 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 ASSIMP team, nor the names of its
# contributors may be used to endorse or promote products
# derived from this software without specific prior
# written permission of the ASSIMP Development Team.
#
# 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
# OWNER 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.
# ---------------------------------------------------------------------------
"""Generate the C++ glue code needed to map EXPRESS to C++"""
import sys, os, re
if sys.version_info < (3, 0):
print("must use python 3.0 or greater")
sys.exit(-2)
use_ifc_template = False
input_step_template_h = 'StepReaderGen.h.template'
input_step_template_cpp = 'StepReaderGen.cpp.template'
input_ifc_template_h = 'IFCReaderGen.h.template'
input_ifc_template_cpp = 'IFCReaderGen.cpp.template'
cpp_keywords = "class"
output_file_h = ""
output_file_cpp = ""
if (use_ifc_template ):
input_template_h = input_ifc_template_h
input_template_cpp = input_ifc_template_cpp
output_file_h = os.path.join('..','..','code','IFCReaderGen.h')
output_file_cpp = os.path.join('..','..','code','IFCReaderGen.cpp')
else:
input_template_h = input_step_template_h
input_template_cpp = input_step_template_cpp
output_file_h = os.path.join('..','..','code/Importer/StepFile','StepReaderGen.h')
output_file_cpp = os.path.join('..','..','code/Importer/StepFile','StepReaderGen.cpp')
template_entity_predef = '\tstruct {entity};\n'
template_entity_predef_ni = '\ttypedef NotImplemented {entity}; // (not currently used by Assimp)\n'
template_entity = r"""
// C++ wrapper for {entity}
struct {entity} : {parent} ObjectHelper<{entity},{argcnt}> {{ {entity}() : Object("{entity}") {{}}
{fields}
}};"""
template_entity_ni = ''
template_type = r"""
// C++ wrapper type for {type}
typedef {real_type} {type};"""
template_stub_decl = '\tDECL_CONV_STUB({type});\n'
template_schema = '\t\tSchemaEntry("{normalized_name}",&STEP::ObjectHelper<{type},{argcnt}>::Construct )\n'
template_schema_type = '\t\tSchemaEntry("{normalized_name}",NULL )\n'
template_converter = r"""
// -----------------------------------------------------------------------------------------------------------
template <> size_t GenericFill<{type}>(const DB& db, const LIST& params, {type}* in)
{{
{contents}
}}"""
template_converter_prologue_a = '\tsize_t base = GenericFill(db,params,static_cast<{parent}*>(in));\n'
template_converter_prologue_b = '\tsize_t base = 0;\n'
template_converter_check_argcnt = '\tif (params.GetSize() < {max_arg}) {{ throw STEP::TypeError("expected {max_arg} arguments to {name}"); }}'
template_converter_code_per_field = r""" do {{ // convert the '{fieldname}' argument
boost::shared_ptr<const DataType> arg = params[base++];{handle_unset}{convert}
}} while(0);
"""
template_allow_optional = r"""
if (dynamic_cast<const UNSET*>(&*arg)) break;"""
template_allow_derived = r"""
if (dynamic_cast<const ISDERIVED*>(&*arg)) {{ in->ObjectHelper<Assimp::IFC::{type},{argcnt}>::aux_is_derived[{argnum}]=true; break; }}"""
template_convert_single = r"""
try {{ GenericConvert( in->{name}, arg, db ); break; }}
catch (const TypeError& t) {{ throw TypeError(t.what() + std::string(" - expected argument {argnum} to {classname} to be a `{full_type}`")); }}"""
template_converter_omitted = '// this data structure is not used yet, so there is no code generated to fill its members\n'
template_converter_epilogue = '\treturn base;'
import ExpressReader
def get_list_bounds(collection_spec):
start,end = [(int(n) if n!='?' else 0) for n in re.findall(r'(\d+|\?)',collection_spec)]
return start,end
def get_cpp_type(field,schema):
isobjref = field.type in schema.entities
base = field.type
if isobjref:
base = 'Lazy< '+(base if base in schema.whitelist else 'NotImplemented')+' >'
if field.collection:
start,end = get_list_bounds(field.collection)
base = 'ListOf< {0}, {1}, {2} >'.format(base,start,end)
if not isobjref:
base += '::Out'
if field.optional:
base = 'Maybe< '+base+' >'
return base
def generate_fields(entity,schema):
fields = []
for e in entity.members:
fields.append('\t\t{type} {name};'.format(type=get_cpp_type(e,schema),name=e.name))
return '\n'.join(fields)
def handle_unset_args(field,entity,schema,argnum):
n = ''
# if someone derives from this class, check for derived fields.
if any(entity.name==e.parent for e in schema.entities.values()):
n += template_allow_derived.format(type=entity.name,argcnt=len(entity.members),argnum=argnum)
if not field.optional:
return n+''
return n+template_allow_optional.format()
def get_single_conversion(field,schema,argnum=0,classname='?'):
typen = field.type
name = field.name
if field.collection:
typen = 'LIST'
return template_convert_single.format(type=typen,name=name,argnum=argnum,classname=classname,full_type=field.fullspec)
def count_args_up(entity,schema):
return len(entity.members) + (count_args_up(schema.entities[entity.parent],schema) if entity.parent else 0)
def resolve_base_type(base,schema):
if base in ('INTEGER','REAL','STRING','ENUMERATION','BOOLEAN','NUMBER', 'SELECT','LOGICAL'):
return base
if base in schema.types:
return resolve_base_type(schema.types[base].equals,schema)
print(base)
return None
def gen_type_struct(typen,schema):
base = resolve_base_type(typen.equals,schema)
if not base:
return ''
if typen.aggregate:
start,end = get_list_bounds(typen.aggregate)
base = 'ListOf< {0}, {1}, {2} >'.format(base,start,end)
return template_type.format(type=typen.name,real_type=base)
def gen_converter(entity,schema):
max_arg = count_args_up(entity,schema)
arg_idx = arg_idx_ofs = max_arg - len(entity.members)
code = template_converter_prologue_a.format(parent=entity.parent) if entity.parent else template_converter_prologue_b
if entity.name in schema.blacklist_partial:
return code+template_converter_omitted+template_converter_epilogue;
if max_arg > 0:
code +=template_converter_check_argcnt.format(max_arg=max_arg,name=entity.name)
for field in entity.members:
code += template_converter_code_per_field.format(fieldname=field.name,
handle_unset=handle_unset_args(field,entity,schema,arg_idx-arg_idx_ofs),
convert=get_single_conversion(field,schema,arg_idx,entity.name))
arg_idx += 1
return code+template_converter_epilogue
def get_base_classes(e,schema):
def addit(e,out):
if e.parent:
out.append(e.parent)
addit(schema.entities[e.parent],out)
res = []
addit(e,res)
return list(reversed(res))
def get_derived(e,schema):
def get_deriv(e,out): # bit slow, but doesn't matter here
s = [ee for ee in schema.entities.values() if ee.parent == e.name]
for sel in s:
out.append(sel.name)
get_deriv(sel,out)
res = []
get_deriv(e,res)
return res
def get_hierarchy(e,schema):
return get_derived(e.schema)+[e.name]+get_base_classes(e,schema)
def sort_entity_list(schema):
deps = []
entities = schema.entities
for e in entities.values():
deps += get_base_classes(e,schema)+[e.name]
checked = []
for e in deps:
if e not in checked:
checked.append(e)
return [entities[e] for e in checked]
def work(filename):
schema = ExpressReader.read(filename,silent=True)
entities, stub_decls, schema_table, converters, typedefs, predefs = '','',[],'','',''
entitylist = 'ifc_entitylist.txt'
if not use_ifc_template:
entitylist = 'step_entitylist.txt'
whitelist = []
2018-09-28 15:06:03 +00:00
with open(entitylist, 'rt') as inp:
whitelist = [n.strip() for n in inp.read().split('\n') if n[:1]!='#' and n.strip()]
schema.whitelist = set()
schema.blacklist_partial = set()
for ename in whitelist:
try:
e = schema.entities[ename]
except KeyError:
# type, not entity
continue
for base in [e.name]+get_base_classes(e,schema):
schema.whitelist.add(base)
for base in get_derived(e,schema):
schema.blacklist_partial.add(base)
schema.blacklist_partial -= schema.whitelist
schema.whitelist |= schema.blacklist_partial
# Generate list with reserved keywords from c++
cpp_types = cpp_keywords.split(',')
# uncomment this to disable automatic code reduction based on whitelisting all used entities
# (blacklisted entities are those who are in the whitelist and may be instanced, but will
# only be accessed through a pointer to a base-class.
#schema.whitelist = set(schema.entities.keys())
#schema.blacklist_partial = set()
for ntype in schema.types.values():
typedefs += gen_type_struct(ntype,schema)
schema_table.append(template_schema_type.format(normalized_name=ntype.name.lower()))
sorted_entities = sort_entity_list(schema)
for entity in sorted_entities:
parent = entity.parent+',' if entity.parent else ''
if ( entity.name in cpp_types ):
entity.name = entity.name + "_t"
print( "renaming " + entity.name)
if entity.name in schema.whitelist:
converters += template_converter.format(type=entity.name,contents=gen_converter(entity,schema))
schema_table.append(template_schema.format(type=entity.name,normalized_name=entity.name.lower(),argcnt=len(entity.members)))
entities += template_entity.format(entity=entity.name,argcnt=len(entity.members),parent=parent,fields=generate_fields(entity,schema))
predefs += template_entity_predef.format(entity=entity.name)
stub_decls += template_stub_decl.format(type=entity.name)
else:
entities += template_entity_ni.format(entity=entity.name)
predefs += template_entity_predef_ni.format(entity=entity.name)
schema_table.append(template_schema.format(type="NotImplemented",normalized_name=entity.name.lower(),argcnt=0))
schema_table = ','.join(schema_table)
with open(input_template_h,'rt') as inp:
with open(output_file_h,'wt') as outp:
# can't use format() here since the C++ code templates contain single, unescaped curly brackets
outp.write(inp.read().replace('{predefs}',predefs).replace('{types}',typedefs).replace('{entities}',entities).replace('{converter-decl}',stub_decls))
with open(input_template_cpp,'rt') as inp:
with open(output_file_cpp,'wt') as outp:
outp.write(inp.read().replace('{schema-static-table}',schema_table).replace('{converter-impl}',converters))
if __name__ == "__main__":
sys.exit(work(sys.argv[1] if len(sys.argv)>1 else 'schema.exp'))