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"""

This pre-processor parses a single file containing a list of

MP_REGISTER_ROOT_POINTER(variable declaration) items.

These are used to generate a header with the required entries for

"struct _mp_state_vm_t" in py/mpstate.h

"""

import argparse

import io

import re

PATTERN = re.compile(r"MP_REGISTER_ROOT_POINTER\((.*?)\);")

def find_root_pointer_registrations(filename):

"""Find any MP_REGISTER_ROOT_POINTER definitions in the provided file.

:param str filename: path to file to check

:return: List[variable_declaration]

"""

with io.open(filename, encoding="utf-8") as c_file_obj:

return set(re.findall(PATTERN, c_file_obj.read()))

def generate_root_pointer_header(root_pointers):

"""Generate header with root pointer entries.

:param List[variable_declaration] root_pointers: root pointer declarations

:return: None

"""

# Print header file for all external modules.

print("// Automatically generated by make_root_pointers.py.")

print()

for item in root_pointers:

print(item, end=";")

print()

def main():

parser = argparse.ArgumentParser()

parser.add_argument("file", nargs=1, help="file with MP_REGISTER_ROOT_POINTER definitions")

args = parser.parse_args()

root_pointers = find_root_pointer_registrations(args.file[0])

generate_root_pointer_header(sorted(root_pointers))

if __name__ == "__main__":

main()

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