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