cpython/Parser/pgen/__main__.py

import argparse

from .pgen import ParserGenerator


def main():
    parser = argparse.ArgumentParser(description="Parser generator main program.")
    parser.add_argument(
        "grammar", type=str, help="The file with the grammar definition in EBNF format"
    )
    parser.add_argument(
        "tokens", type=str, help="The file with the token definitions"
    )
    parser.add_argument(
        "graminit_h",
        type=argparse.FileType('w'),
        help="The path to write the grammar's non-terminals as #defines",
    )
    parser.add_argument(
        "graminit_c",
        type=argparse.FileType('w'),
        help="The path to write the grammar as initialized data",
    )

    parser.add_argument("--verbose", "-v", action="count")
    args = parser.parse_args()

    p = ParserGenerator(args.grammar, args.tokens, verbose=args.verbose)
    grammar = p.make_grammar()
    grammar.produce_graminit_h(args.graminit_h.write)
    grammar.produce_graminit_c(args.graminit_c.write)


if __name__ == "__main__":
    main()