def test_lookahead(self):
x = t.Lookahead(t.Exactly("x"))
self.assertEqual(writeBytecode(x),
[t.Choice(7),
t.Choice(4),
t.Match('x'),
t.Commit(1),
t.Fail(),
t.Commit(1),
t.Fail()])
def generate_Lookahead(self, out, expr, debugname=None):
L1 = out.emit(t.Choice())
L2 = out.emit(t.Choice())
self._generateNode(out, expr)
L3 = out.emit(t.Commit(), label=L2)
out.emit(t.Fail(), label=L3)
out.patchNext(L1)
def test_not(self):
x = t.Not(t.Exactly("x"))
self.assertEqual(writeBytecode(x),
[t.Choice(4),
t.Match('x'),
t.Commit(1),
t.Fail()])
def generate_Not(self, out, expr, debugname=None):
L1 = out.emit(t.Choice())
self._generateNode(out, expr)
L2 = out.emit(t.Commit())
out.emit(t.Fail(), label=L1)
out.patchNext(L2)