def test_it_sets_default_position(self):
default = Position(0, 1, 1)
self.assertEqual(default, Cursor().position)
def test_it_decrements_cursor_to_prev_char_position(self):
start, dest = Position(1, 3, 5), Position(1 - 1, 3, 5 - 1)
cursor = Cursor(start)
cursor.step_prev_char()
self.assertEqual(dest, cursor.position)
def test_it_decrements_line(self):
pos = Position(1, 3, 5)
cursor = Cursor(pos)
cursor.step_next_line()
cursor.step_prev_line()
self.assertEqual(pos, cursor.position)
def test_it_increments_line(self):
start, dest = Position(1, 3, 5), Position(1, 3 + 1, 0)
cursor = Cursor(start)
cursor.step_next_line()
self.assertEqual(dest, cursor.position)
def test_it_increments_cursor_to_next_char_position(self):
start, dest = Position(1, 3, 5), Position(1 + 1, 3, 5 + 1)
cursor = Cursor(start)
cursor.step_next_char()
self.assertEqual(dest, cursor.position)
def test_it_sets_position_to_provided_position(self):
pos = Position(1, 3, 5)
self.assertEqual(pos, Cursor(pos).position)
def test_it_validates_context(self):
stream = parsing.Stream()
stream._contexts.insert(0, Position(42, 0, 0))
stream.validate_context()
self.assertEqual(0, stream.index)
def test_it_restore_context(self):
stream = parsing.Stream()
pos = Position(42, 0, 0)
stream._contexts.insert(0, pos)
stream.restore_context()
self.assertEqual(pos.index, stream.index)