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"""Generate Lib/keyword.py from the Grammar and Tokens files using pgen"""
import argparse
from .build import build_parser, generate_token_definitions
from .c_generator import CParserGenerator
TEMPLATE = r'''
"""Keywords (from "Grammar/python.gram")
This file is automatically generated; please don't muck it up!
To update the symbols in this file, 'cd' to the top directory of
the python source tree and run:
PYTHONPATH=Tools/peg_generator python3 -m pegen.keywordgen \
Grammar/Grammar \
Grammar/Tokens \
Lib/keyword.py
Alternatively, you can run 'make regen-keyword'.
"""
__all__ = ["iskeyword", "kwlist"]
kwlist = [
{keywords}
]
iskeyword = frozenset(kwlist).__contains__
'''.lstrip()
EXTRA_KEYWORDS = ["async", "await"]
def main():
parser = argparse.ArgumentParser(
description="Generate the Lib/keywords.py file from the grammar."
)
parser.add_argument(
"grammar", type=str, help="The file with the grammar definition in PEG format"
)
parser.add_argument(
"tokens_file", type=argparse.FileType("r"), help="The file with the token definitions"
)
parser.add_argument(
"keyword_file",
type=argparse.FileType("w"),
help="The path to write the keyword definitions",
)
args = parser.parse_args()
grammar, _, _ = build_parser(args.grammar)
with args.tokens_file as tok_file:
all_tokens, exact_tok, non_exact_tok = generate_token_definitions(tok_file)
gen: ParserGenerator = CParserGenerator(
grammar, all_tokens, exact_tok, non_exact_tok, file=None
)
gen.collect_todo()
with args.keyword_file as thefile:
all_keywords = sorted(list(gen.callmakervisitor.keyword_cache.keys()) + EXTRA_KEYWORDS)
keywords = ",\n ".join(map(repr, all_keywords))
thefile.write(TEMPLATE.format(keywords=keywords))
if __name__ == "__main__":
main()
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