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42a7dacb91
Instead of using Python's inheritance mechanism to define enum nodes, the new mechanism requires adding enum_node = True to the class' body. Inheritance can now be used to make the enum node derive from any subclass of ASTNode instead ASTNode itself.
53 lines
1.1 KiB
Python
53 lines
1.1 KiB
Python
"""
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Test that the "is_ghost" AST node predicate works in the Python API.
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"""
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from __future__ import absolute_import, division, print_function
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from langkit.dsl import ASTNode, Field, T
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from langkit.parsers import Grammar, List, Or
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from lexer_example import Token
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from utils import build_and_run
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class FooNode(ASTNode):
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pass
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class Enum(FooNode):
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enum_node = True
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alternatives = ['null', 'example', 'default']
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class PlusQualifier(FooNode):
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enum_node = True
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qualifier = True
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class Param(FooNode):
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name = Field(type=T.Name)
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mode = Field(type=T.Enum)
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has_plus = Field(type=T.PlusQualifier)
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class Name (FooNode):
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token_node = True
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foo_grammar = Grammar('main_rule')
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foo_grammar.add_rules(
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main_rule=List(Param(foo_grammar.name,
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foo_grammar.mode,
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foo_grammar.plus)),
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name=Name(Token.Identifier),
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mode=Or(
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Enum.alt_null('null'),
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Enum.alt_example('example'),
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Enum.alt_default(),
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),
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plus=PlusQualifier('+'),
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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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