RustPython/vm/src/frozen.rs

use crate::bytecode::FrozenModule;

pub fn core_frozen_inits() -> impl Iterator<Item = (String, FrozenModule)> {
    let iter = std::iter::empty();
    macro_rules! ext_modules {
        ($iter:ident, ($modules:expr)) => {
            let $iter = $iter.chain($modules);
        };
        ($iter:ident, $($t:tt)*) => {
            ext_modules!($iter, (py_freeze!($($t)*)))
        };
    }

    ext_modules!(
        iter,
        source = "initialized = True; print(\"Hello world!\")\n",
        module_name = "__hello__",
    );

    // Python modules that the vm calls into, but are not actually part of the stdlib. They could
    // in theory be implemented in Rust, but are easiest to do in Python for one reason or another.
    // Includes _importlib_bootstrap and _importlib_bootstrap_external
    ext_modules!(
        iter,
        (rustpython_derive::py_freeze!(
            dir = "./Lib/python_builtins",
            crate_name = "rustpython_compiler_core"
        ))
    );

    // core stdlib Python modules that the vm calls into, but are still used in Python
    // application code, e.g. copyreg
    #[cfg(not(feature = "freeze-stdlib"))]
    ext_modules!(
        iter,
        (rustpython_derive::py_freeze!(
            dir = "./Lib/core_modules",
            crate_name = "rustpython_compiler_core"
        ))
    );

    iter
}