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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
'''
pytagomacs – An Emacs like key–value editor library for Python
Copyright © 2013, 2014 Mattias Andrée (maandree@member.fsf.org)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
'''
class Edit():
'''
A line edit
'''
def __init__(self, deleted, inserted, y, old_x, new_x):
'''
Constructor
@param deleted:str? The text deleted by the edit
@param inserted:str? The text inserted by the edit
@param y:int The index of the line the edit was made one
@param old_x:int The position on the line before the edit was made
@param new_x:int The position on the line after the edit was made
'''
self.deleted, self.inserted = deleted, inserted
self.y, self.old_x, self.new_x = y, old_x, new_x
def reverse(self):
'''
Create a clone of the object but create a mirror object
@return :Edit The object's opposite
'''
return Edit(self.inserted, self.deleted, self.y, self.new_x, self.new_y)
class Editring():
'''
Editing ring class
'''
def __init__(self, limit = 100):
'''
Constructor
@param limit:int The maximum size of the ring
'''
self.editring, self.editmax, self.editptr, self.editdir = [], limit, 0, -1
def is_empty(self):
'''
Checks if the editing is empty
@return :bool Whether the editring is empty
'''
return len(self.editring) == 0
def change_direction(self):
'''
Swap between undoing and redoing
'''
self.editdir = -(self.editdir)
def push(self, edit):
'''
Insert a new edit to the editring
@param edit:Edit The edit to insert
'''
self.editdir = -1
self.editring[:] = self.editring[:self.editptr] + [edit] + self.editring[self.editptr:]
if len(self.editring) > self.editmax:
i = (self.editptr + self.editmax // 2) % self.editmax
self.editring[:] = self.editring[:i] + self.editring[i + 1:]
def pop(self):
'''
Get the next undo or redo
@return :(Edit, bool)? The edit to preform (not reverse) and whether it is a undo
'''
if is_empty():
return None
if self.editptr < 0:
self.editptr = min(1, len(self.editring))
self.editdir = 1
elif self.editptr == len(self.editring):
self.editptr = max(1, len(self.editring) - 2)
self.editdir = -1
edit = self.editring[self.editptr]
self.editptr += self.editdir
return (edit, True) if self.editdir < 0 else (edit.reverse(), False)
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