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"""Generate Lib/keyword.py from the Grammar and Tokens files using pgen"""
import argparse
from .pgen import ParserGenerator
TEMPLATE = r'''
"""Keywords (from "Grammar/Grammar")
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:
python3 -m Parser.pgen.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 EBNF format"
)
parser.add_argument(
"tokens", type=str, 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()
p = ParserGenerator(args.grammar, args.tokens)
grammar = p.make_grammar()
with args.keyword_file as thefile:
all_keywords = sorted(list(grammar.keywords) + EXTRA_KEYWORDS)
keywords = ",\n ".join(map(repr, all_keywords))
thefile.write(TEMPLATE.format(keywords=keywords))
if __name__ == "__main__":
main()
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