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40 lines
876 B
Python
40 lines
876 B
Python
from __future__ import absolute_import, division, print_function
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import os.path
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from langkit.diagnostics import Diagnostics
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from langkit.dsl import ASTNode, Field, Token as TokenType
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from langkit.parsers import Grammar, List, Or, Pick, Tok
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from lexer_example import Token
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from utils import build_and_run
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Diagnostics.set_lang_source_dir(os.path.abspath(__file__))
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class FooNode(ASTNode):
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pass
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class Sequence(FooNode.list):
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pass
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class Atom(FooNode):
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tok = Field(type=TokenType)
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foo_grammar = Grammar('main_rule')
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foo_grammar.add_rules(
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main_rule=foo_grammar.element,
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element=Or(foo_grammar.sequence, foo_grammar.atom),
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sequence=Pick('(', List(foo_grammar.element, list_cls=Sequence,
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empty_valid=True), ')'),
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atom=Atom(Tok(Token.Identifier, keep=True)),
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)
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build_and_run(foo_grammar, 'main.py')
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print('Done')
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