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import unittest
from ast import parse
from tatsu.exceptions import FailedParse
from tatsu.ngcodegen import codegen
from tatsu.tool import compile
from tatsu.util import trim
class JoinTests(unittest.TestCase):
def test_positive_join(self):
grammar = """
start = ','%{'x' 'y'}+ ;
"""
grammar2 = """
start = (','%{'x'}+|{}) ;
"""
grammar3 = """
start = [','%{'x'}+] ;
"""
model = compile(grammar, 'test')
codegen(model)
ast = model.parse('x y, x y', nameguard=False)
self.assertEqual([['x', 'y'], ',', ['x', 'y']], ast)
ast = model.parse('x y x y', nameguard=False)
self.assertEqual([['x', 'y']], ast)
try:
ast = model.parse('y x', nameguard=False)
self.fail('closure not positive')
except FailedParse:
pass
model = compile(grammar2, 'test')
ast = model.parse('y x', nameguard=False)
self.assertEqual([], ast)
ast = model.parse('x', nameguard=False)
self.assertEqual(['x'], ast)
ast = model.parse('x,x', nameguard=False)
self.assertEqual(['x', ',', 'x'], ast)
model = compile(grammar3, 'test')
ast = model.parse('y x', nameguard=False)
self.assertEqual(None, ast)
def test_normal_join(self):
grammar = """
start = ','%{'x' 'y'} 'z' ;
"""
model = compile(grammar, 'test')
codegen(model)
ast = model.parse('x y, x y z', nameguard=False)
self.assertEqual(([['x', 'y'], ',', ['x', 'y']], 'z'), ast)
ast = model.parse('x y z', nameguard=False)
self.assertEqual(([['x', 'y']], 'z'), ast)
ast = model.parse('z', nameguard=False)
self.assertEqual(([], 'z'), ast)
def test_group_join(self):
grammar = """
start = ('a' 'b')%{'x'}+ ;
"""
model = compile(grammar, 'test')
c = codegen(model)
parse(c)
ast = model.parse('x a b x', nameguard=False)
self.assertEqual(['x', ['a', 'b'], 'x'], ast)
def test_positive_gather(self):
grammar = """
start = ','.{'x' 'y'}+ ;
"""
grammar2 = """
start = (','.{'x'}+|{}) ;
"""
grammar3 = """
start = [','.{'x'}+] ;
"""
model = compile(grammar, 'test')
codegen(model)
ast = model.parse('x y, x y', nameguard=False)
self.assertEqual([['x', 'y'], ['x', 'y']], ast)
ast = model.parse('x y x y', nameguard=False)
self.assertEqual([['x', 'y']], ast)
try:
ast = model.parse('y x', nameguard=False)
self.fail('closure not positive')
except FailedParse:
pass
model = compile(grammar2, 'test')
ast = model.parse('y x', nameguard=False)
self.assertEqual([], ast)
ast = model.parse('x', nameguard=False)
self.assertEqual(['x'], ast)
ast = model.parse('x,x', nameguard=False)
self.assertEqual(['x', 'x'], ast)
model = compile(grammar3, 'test')
ast = model.parse('y x', nameguard=False)
self.assertEqual(None, ast)
def test_normal_gather(self):
grammar = """
start = ','.{'x' 'y'} 'z' ;
"""
model = compile(grammar, 'test')
codegen(model)
ast = model.parse('x y, x y z', nameguard=False)
self.assertEqual(([['x', 'y'], ['x', 'y']], 'z'), ast)
ast = model.parse('x y z', nameguard=False)
self.assertEqual(([['x', 'y']], 'z'), ast)
ast = model.parse('z', nameguard=False)
self.assertEqual(([], 'z'), ast)
def test_group_gather(self):
grammar = """
start = ('a' 'b').{'x'}+ ;
"""
model = compile(grammar, 'test')
c = codegen(model)
parse(c)
ast = model.parse('x a b x', nameguard=False)
self.assertEqual(['x', 'x'], ast)
def test_left_join(self):
grammar = r"""
start
=
(op)<{number}+ $
;
op
=
'+' | '-'
;
number
=
/\d+/
;
"""
text = '1 + 2 - 3 + 4'
model = compile(grammar, 'test')
self.assertEqual(trim(grammar).strip(), str(model).strip())
codegen(model)
ast = model.parse(text)
self.assertEqual(('+', ('-', ('+', '1', '2'), '3'), '4'), ast)
def test_right_join(self):
grammar = r"""
start
=
(op)>{number}+ $
;
op
=
'+' | '-'
;
number
=
/\d+/
;
"""
text = '1 + 2 - 3 + 4'
model = compile(grammar, 'test')
self.assertEqual(trim(grammar).strip(), str(model).strip())
codegen(model)
ast = model.parse(text)
self.assertEqual(('+', '1', ('-', '2', ('+', '3', '4'))), ast)
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