class Editor:
__text: str
undo_stack: UndoStack
def __init__(self, text: str):
self.__text = text
self.undo_stack = UndoStack()
def get_text(self):
return self.__text
def select(self, start: int, end: int):
if start > end or end >= len(self.__text):
raise InvalidTextPositionError(
"Требуемая позиция в тексте недоступна")
return Selection(start, end)
def find(self, what: str, after_pos: int = -1):
return self.__text.find(what, after_pos + 1)
def insert(self, selection: Selection, what: str):
insert = InsertCommand(selection, what)
self.__text = insert.do(self.__text)
self.undo_stack.push(insert)
def make_bold(self, selection: Selection):
bold = MakeBoldCommand(selection)
self.__text = bold.do(self.__text)
self.undo_stack.push(bold)
def make_italic(self, selection: Selection):
italic = MakeItalicCommand(selection)
self.__text = italic.do(self.__text)
self.undo_stack.push(italic)
def make_underline(self, selection: Selection):
underline = MakeUnderlineCommand(selection)
self.__text = underline.do(self.__text)
self.undo_stack.push(underline)
def undo(self):
cmd = self.undo_stack.pop()
if cmd is not None:
self.__text = cmd.undo(self.__text)
