class TextEditor:
def __init__(self):
self.file_lines = [EMPTY_LINE]
self.current_line_index = FIRST_LINE_INDEX
self.router = Router(self)
self.end = False
def start(self):
print(WELCOME_TEXT_MESSAGE)
while not self.end:
command = input()
self.router.get_route(command)
@staticmethod
def help():
for command in ALL_POSSIBLE_COMMANDS:
print(command)
def new_file(self):
self.file_lines = [EMPTY_LINE]
def load_file(self):
file_name = input()
try:
file = open(
os.path.dirname(__file__) + PATH_TO_FILE % file_name,
READ_FILE)
self.file_lines = file.read().split(NEW_LINE)
file.close()
except FileNotFoundError:
print(FILE_ERROR_MESSAGE)
def save_file(self):
file_name = input()
file = open(
os.path.dirname(__file__) + PATH_TO_FILE % file_name, WRITE_FILE)
file.write(NEW_LINE.join(self.file_lines))
file.close()
def move_up(self):
if not self.is_first_line():
self.decrement_line_index()
self.print_current_line()
def move_down(self):
if not self.is_last_line():
self.increment_line_index()
self.print_current_line()
def page_up(self):
start_index = self.current_line_index - PAGE_UP_DOWN_RANGE if self.current_line_index > PAGE_UP_DOWN_RANGE else 0
for i in range(start_index, self.current_line_index):
self.current_line_index = i
self.print_current_line()
def page_down(self):
end_index = self.current_line_index + PAGE_UP_DOWN_RANGE \
if self.get_count_lines_before_end() > PAGE_UP_DOWN_RANGE else len(self.file_lines)
while self.current_line_index != end_index:
self.move_down()
def head(self):
self.current_line_index = FIRST_LINE_INDEX
self.print_current_line()
def tail(self):
self.current_line_index = self.get_last_line_index()
self.print_current_line()
def insert_before(self):
self.decrement_line_index() if not self.is_first_line() else None
self.insert_empty_line()
self.print_current_line()
def insert_after(self):
self.increment_line_index()
self.insert_empty_line()
self.print_current_line()
def delete(self):
self.remove_current_line(
) if not self.is_first_line() else self.set_current_line(EMPTY_LINE)
def replace(self):
self.set_current_line(input())
def show(self):
start_index = self.current_line_index - SHOW_UP_DOWN_RANGE \
if self.current_line_index > SHOW_UP_DOWN_RANGE else FIRST_LINE_INDEX
end_index = self.current_line_index + SHOW_UP_DOWN_RANGE + 1 \
if self.get_count_lines_before_end() > SHOW_UP_DOWN_RANGE else len(self.file_lines)
[
self.print_line(i)
for i in range(start_index, self.current_line_index)
]
self.print_current_line()
[
self.print_line(i)
for i in range(self.current_line_index + 1, end_index)
]
def exit(self):
print(EXIT_TEXT_MESSAGE)
self.end = True
def get_count_lines_before_end(self):
return self.get_last_line_index() - self.current_line_index
def is_first_line(self):
return self.current_line_index == FIRST_LINE_INDEX
def is_last_line(self):
return self.current_line_index == self.get_last_line_index()
def insert_empty_line(self):
self.file_lines.insert(self.current_line_index, EMPTY_LINE)
def get_last_line_index(self):
return len(self.file_lines) - 1
def increment_line_index(self):
self.current_line_index += 1
def decrement_line_index(self):
self.current_line_index -= 1
def print_current_line(self):
print(PRINT_LINE_FORMAT % (self.current_line_index + 1,
self.file_lines[self.current_line_index]))
def print_line(self, index):
print(PRINT_LINE_FORMAT % (index + 1, self.file_lines[index]))
def set_current_line(self, value):
self.file_lines[self.current_line_index] = value
def remove_current_line(self):
if self.is_last_line():
self.current_line_index -= 1
self.file_lines.pop(self.current_line_index + 1)
