mirror of
https://github.com/AdaCore/langkit.git
synced 2026-02-12 12:28:12 -08:00
35 lines
735 B
Python
35 lines
735 B
Python
from __future__ import absolute_import, division, print_function
|
|
|
|
from langkit.dsl import ASTNode, has_abstract_list
|
|
from langkit.parsers import Grammar, List, Or, Pick
|
|
|
|
from lexer_example import Token
|
|
from utils import build_and_run
|
|
|
|
|
|
@has_abstract_list
|
|
class FooNode(ASTNode):
|
|
pass
|
|
|
|
|
|
class Sequence(FooNode.list):
|
|
pass
|
|
|
|
|
|
class Atom(FooNode):
|
|
token_node = True
|
|
|
|
|
|
foo_grammar = Grammar('main_rule')
|
|
foo_grammar.add_rules(
|
|
main_rule=foo_grammar.element,
|
|
element=Or(foo_grammar.sequence, foo_grammar.atom),
|
|
sequence=Pick('(', List(foo_grammar.element, list_cls=Sequence,
|
|
empty_valid=True), ')'),
|
|
atom=Atom(Token.Identifier),
|
|
)
|
|
|
|
build_and_run(foo_grammar, 'main.py')
|
|
|
|
print('Done')
|