IfcOpenShell/src/ifcopenshell-python/ifcopenshell/express

IfcOpenShell express schema parser and code generator

This folder contains Python code to generate C++ type information based on an Express schema. In particular is has only been tested using recent version of the IFC schema and will most likely fail on any other Express schema.

The code can be invoked in the following way and results in several code outputs named according to the schema name in the Express file. A python 3 interpreter with the pyparsing (pip install pyparsing) library is required.

Command line usage for code generation

# python3 bootstrap.py express.bnf > express_parser.py
python3 express_parser.py IFC2X3_TC1.exp header implementation schema_class definitions

Programmatic usage

import ifcopenshell
import ifcopenshell.express
schema = ifcopenshell.express.parse('IFC.exp')
ifcopenshell.register_schema(schema)
f = ifcopenshell.file(schema=schema.schema.name())
f.createIfcProject(ifcopenshell.guid.new())