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Update README.md about extend express usage (#4841)

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1. C++ code generation by extend express.
2. python rule code generation by extend express.
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shungeer
2024-07-01 09:20:30 +08:00
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@@ -8,11 +8,24 @@ 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 named according to the schema name in the Express file. A python 3 interpreter
with the `pyparsing` (`pip install pyparsing`) library is required. with the `pyparsing` (`pip install pyparsing`) library is required.
note:
**Keep in mind that Express is not very suitable for this kind of usage. In the end, (as far as I can tell) no tool is able to read your model, because it doesn't understand the schema as it has no notion of the core part vs the addition.**
## Command line usage for code generation ## Command line usage for code generation
The usage for C++ project.
~~~ ~~~
# python3 bootstrap.py express.bnf > express_parser.py # bootstrap.py express.bnf in ifcopenshell-python.ifcopenshell.express.
python3 express_parser.py IFC2X3_TC1.exp header implementation schema_class definitions >>> python3 bootstrap.py express.bnf > express_parser.py
>>> python3 express_parser.py IFC2X3_TC1.exp header implementation schema_class definitions
~~~
The usage for python project.
~~~
# code rule generation
# generating 'ifcopenshell.express.rules.IFC2X3_TC1' in ifcopenshell-python.ifcopenshell.express.rules.
# rule_compiler in ifcopenshell-python.ifcopenshell.express.
>>> python -m rule_compiler IFC2X3_TC1.exp
~~~ ~~~
## Programmatic usage ## Programmatic usage