bootpeg – the bootstrapping PEG parser¶
bootpeg is a PEG parser for creating parsers from grammars – including itself. By default, it supports a modified EBNF with actions akin to PEP 617.
>>> # recreate the bootpeg parser from itself
>>> from bootpeg import import_parser, actions
>>> from bootpeg.grammars import bpeg
>>> parse_bpeg = bpeg.parse
>>> for _ in range(5):
... parse_bpeg = import_parser(
... bpeg.__name__, dialect=parse_bpeg, actions=actions
... )
>>> print(bpeg.unparse(parse_bpeg))
Unlike most other Python PEG parsers,
bootpeg is built for one job and one job only:
Define how to transform input into a runtime representation.
There is
no fancy operator overloading,
no custom AST formats,
no clever PEG extensions,
no whitespace special casing,
no nothing.
bootpeg supports left-recursive PEG parsing with actions.
That’s it.