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|
import unittest
from tatsu.tool import compile
from tatsu.util import trim
class PrettyTests(unittest.TestCase):
def test_pretty(self):
grammar = r"""
start = lisp ;
lisp = sexp | list | symbol;
sexp::SExp = '(' cons:lisp '.' ~ cdr:lisp ')' ;
list::List = '(' elements:{sexp}* ')' ;
symbol::Symbol = value:/[^\s().]+/ ;
"""
pretty = trim(
r"""
start
=
lisp
;
lisp
=
sexp | list | symbol
;
sexp::SExp
=
'(' cons:lisp '.' ~ cdr:lisp ')'
;
list::List
=
'(' elements:{sexp} ')'
;
symbol::Symbol
=
value:/[^\s().]+/
;
""",
)
pretty_lean = trim(
r"""
start
=
lisp
;
lisp
=
sexp | list | symbol
;
sexp
=
'(' lisp '.' ~ lisp ')'
;
list
=
'(' {sexp} ')'
;
symbol
=
/[^\s().]+/
;
""",
)
model = compile(grammar=grammar)
self.assertEqual(pretty, model.pretty())
self.assertEqual(str(model), model.pretty())
self.assertEqual(pretty_lean, model.pretty_lean())
def test_slashed_pattern(self):
grammar = """
start
=
?"[a-z]+/[0-9]+" $
;
"""
model = compile(grammar=grammar)
ast = model.parse('abc/123')
self.assertEqual('abc/123', ast)
print(model.pretty())
self.assertEqual(trim(grammar), model.pretty())
|
