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# Copyright (c) 2017-2026 Juancarlo Añez (apalala@gmail.com)
# SPDX-License-Identifier: BSD-4-Clause
from __future__ import annotations
import json # noqa: F401
from typing import Any
import pytest
import tatsu
from tatsu import grammars
from tatsu.objectmodel import Node
def test_node_kwargs() -> None:
class Atom(Node):
def __init__(self, **kwargs):
super().__init__(**kwargs)
arguments: Any = None
symbol: Any = None
atom = Atom(symbol='foo')
assert type(atom).__name__ == 'Atom'
assert atom.ast is None
assert atom.symbol == 'foo'
atom = Atom(symbol='foo', ast={})
assert atom.ast == {}
assert atom.symbol is not None
assert atom.symbol == 'foo'
atom = Atom(ast=42, symbol='foo')
assert atom.ast == 42
assert atom.symbol is not None
assert atom.symbol == 'foo'
atom = Atom(ast={'bar': 1}, symbol='foo')
assert atom.ast == {'bar': 1}
with pytest.raises(TypeError, match=r'Overriding method children'):
atom = Atom(children=[])
assert atom
def test_children():
grammar = r"""
@@grammar::Calc
start
=
expression $
;
expression
=
| add:addition
| sub:subtraction
| term:term
;
addition::Add
=
left:term op:'+' ~ right:expression
;
subtraction::Subtract
=
left:term op:'-' ~ right:expression
;
term
=
| mul:multiplication
| div:division
| factor:factor
;
multiplication::Multiply
=
left:factor op:'*' ~ right:term
;
division::Divide
=
left:factor '/' ~ right:term
;
factor
=
| subexpression
| number
;
subexpression
=
'(' ~ @:expression ')'
;
number::int
=
/\d+/
;
"""
parser = tatsu.compile(grammar, asmodel=True, trace=False)
assert parser
model = parser.parse('3 + 5 * ( 10 - 20 )')
assert model
assert model['add']
assert model['add'].children()
assert type(model['add'].children()[0]).__name__ == 'Multiply'
def test_model_repr():
node = Node()
assert repr(node) == 'Node()'
node = Node('hello')
assert repr(node) == "Node(ast='hello')"
node = Node(ast='hello')
assert repr(node) == "Node(ast='hello')"
node = Node(ast='hello', ctx='world')
assert repr(node) == "Node(ast='hello')"
with pytest.raises(ValueError, match=r'world='):
Node(ast='hello', world='world')
token = grammars.Token(ast='hello')
assert repr(token) == "Token(token='hello')"
token = grammars.Token(token='hello')
assert repr(token) == "Token(token='hello')"
grammars.Token('hello')
assert repr(token) == "Token(token='hello')"
with pytest.raises(TypeError, match=r'unexpected keyword argument'):
grammars.Token(x='x')
with pytest.raises(TypeError, match=r'name is required'):
grammars.Named()
named = grammars.Named(name='foo')
assert repr(named) == "Named(name='foo', exp=Void())"
named = grammars.Named(name='foo', ast='bar')
assert repr(named) == "Named(name='foo', exp='bar')"
named = grammars.Named(ast={'name': 'foo', 'exp': 'bar'})
assert repr(named) == "Named(name='foo', exp='bar')"
named = grammars.Named(name='foo', exp='bar')
assert repr(named) == "Named(name='foo', exp='bar')"
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