Translate cpp errors

[kwabenantim]

Supports #83

[Copilot]

Pull request overview

Adds configurable C++ exception translation to cppwg-generated pybind11 modules so that user-defined exception types (including those not derived from std::exception) surface as catchable Python exceptions instead of terminating the interpreter, addressing the crash scenario described in #83.

Changes:

• Introduces an exceptions config option, resolves exception metadata from parsed C++ declarations, and generates py::register_exception_translator(...) code in each module.
• Updates header collection generation (and per-module includes when common_include_file: False) so exception class declarations are available for both parsing and compilation.
• Fixes an explicit free_functions parsing bug and adds unit tests for the parser behavior.

Reviewed changes

Copilot reviewed 22 out of 22 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/test_package_info_parser.py	Adds regression coverage for explicit free_functions parsing and CPPWG_ALL behavior.
README.md	Documents the new exceptions configuration for exception translation.
examples/shapes/wrapper/wrapper_header_collection.cppwg.hpp	Ensures the new example exception header is available via the common include header.
examples/shapes/wrapper/primitives/_pyshapes_primitives.main.cppwg.cpp	Demonstrates generated per-module exception translator registration.
examples/shapes/wrapper/package_info.yaml	Adds an exceptions entry showing message_method configuration.
examples/shapes/wrapper/math_funcs/_pyshapes_math_funcs.main.cppwg.cpp	Demonstrates translator registration and exposes a throwing function to test translation.
examples/shapes/wrapper/geometry/_pyshapes_geometry.main.cppwg.cpp	Demonstrates translator registration in another module.
examples/shapes/src/py/tests/test_functions.py	Adds an example-level test asserting translation to RuntimeError (integration-style).
examples/shapes/src/cpp/math_funcs/ThrowingFunction.hpp	Adds a non-std::exception exception type and a function that throws it.
examples/cells/tests/test_cells.py	Adds an example-level test asserting translation for a std::runtime_error-derived exception using GetMessage().
examples/cells/src/cpp/utils/SimulationException.hpp	Adds an exception type used for demonstrating translation configuration.
examples/cells/src/cpp/utils/PetscUtils.hpp	Adds a C++ entrypoint that throws the example exception.
examples/cells/src/cpp/utils/PetscUtils.cpp	Implements the throwing function and includes the new exception header.
examples/cells/dynamic/wrappers/wrapper_header_collection.cppwg.hpp	Ensures the example exception header is included for dynamic wrapper builds.
examples/cells/dynamic/wrappers/all/PetscUtils.cppwg.cpp	Exposes the throwing method to Python to exercise translation.
examples/cells/dynamic/wrappers/all/_pycells_all.main.cppwg.cpp	Demonstrates module-level translator registration when common_include_file: False.
examples/cells/dynamic/config.yaml	Adds an exceptions entry for the dynamic cells example.
cppwg/writers/module_writer.py	Generates exception-translator code and injects needed includes when not using the common include file.
cppwg/writers/header_collection_writer.py	Adds exception-class header inclusion so configured exceptions are parsed/introspectable.
cppwg/parsers/package_info_parser.py	Adds exceptions default config and fixes explicit free-function parsing bug.
cppwg/info/package_info.py	Stores exception config and resolves exception_info from parsed declarations for codegen.
cppwg/info/free_function_info.py	Improves failure mode when explicitly listed free functions can’t be found in parsed headers.

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