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- import sys
- from argparse import ArgumentParser, FileType
- from lark import Lark
-
- base_argparser = ArgumentParser(add_help=False, epilog='Look at the Lark documentation for more info on the options')
-
-
- flags = [
- ('d', 'debug'),
- 'keep_all_tokens',
- 'regex',
- 'propagate_positions',
- 'maybe_placeholders',
- 'use_bytes'
- ]
-
- options = ['start', 'lexer']
-
- base_argparser.add_argument('-s', '--start', action='append', default=[])
- base_argparser.add_argument('-l', '--lexer', default='contextual', choices=('standard', 'contextual'))
- k = {'encoding':'utf-8'} if sys.version_info > (3, 4) else {}
- base_argparser.add_argument('-o', '--out', type=FileType('w', **k), default=sys.stdout, help='the output file (default=stdout)')
- base_argparser.add_argument('grammar_file', type=FileType('r', **k), help='A valid .lark file')
-
- for f in flags:
- if isinstance(f, tuple):
- options.append(f[1])
- base_argparser.add_argument('-' + f[0], '--' + f[1], action='store_true')
- else:
- options.append(f)
- base_argparser.add_argument('--' + f, action='store_true')
-
- def build_lalr(namespace):
- if len(namespace.start) == 0:
- namespace.start.append('start')
- kwargs = {n: getattr(namespace, n) for n in options}
- return Lark(namespace.grammar_file, parser='lalr', **kwargs), namespace.out
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