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First solution in Clear category for Text Editor by mortonfox
class TextMemento:
def __init__(self, text, font):
self.text = text
self.font = font
class Text:
def __init__(self):
self.text = ''
self.font = None
def set_font(self, font):
self.font = font
def write(self, text):
self.text += text
def show(self):
return self.text if self.font is None else '[%s]%s[%s]' % (self.font, self.text, self.font)
def createMemento(self):
return TextMemento(self.text, self.font)
def restore(self, memento):
self.text = memento.text
self.font = memento.font
class SavedText:
def __init__(self):
self.versions = []
def save_text(self, text):
self.versions.append(text.createMemento())
def get_version(self, number):
return self.versions[number]
if __name__ == '__main__':
#These "asserts" using only for self-checking and not necessary for auto-testing
text = Text()
saver = SavedText()
text.write("At the very beginning ")
saver.save_text(text)
text.set_font("Arial")
saver.save_text(text)
text.write("there was nothing.")
assert text.show() == "[Arial]At the very beginning there was nothing.[Arial]"
text.restore(saver.get_version(0))
assert text.show() == "At the very beginning "
print("Coding complete? Let's try tests!")
Aug. 7, 2018