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https://github.com/emilybache/GildedRose-Refactoring-Kata.git
synced 2026-10-14 18:15:41 +00:00
uzairarslan
b835c7e1da
Conjured items degrade twice as fast as normal ones. Matched by name prefix so any "Conjured ..." item works, not just the Mana Cake. Wrote the tests first, then the updater. Only the Mana Cake lines changed in the approved output.
108 lines
2.8 KiB
Python
Executable File
108 lines
2.8 KiB
Python
Executable File
# -*- coding: utf-8 -*-
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AGED_BRIE = "Aged Brie"
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BACKSTAGE_PASS = "Backstage passes to a TAFKAL80ETC concert"
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SULFURAS = "Sulfuras, Hand of Ragnaros"
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CONJURED_PREFIX = "Conjured"
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MIN_QUALITY = 0
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MAX_QUALITY = 50
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class GildedRose(object):
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def __init__(self, items):
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self.items = items
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def update_quality(self):
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for item in self.items:
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updater_for(item).update(item)
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class ItemUpdater:
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"""End-of-day rules for an ordinary item.
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Subclasses override only the part that differs for their category. Quality
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is assumed to start within [MIN_QUALITY, MAX_QUALITY] as the requirements
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state; it is clamped to that range after every change.
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"""
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def update(self, item):
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self._change_quality(item, self._quality_delta(item))
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item.sell_in -= 1
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def _quality_delta(self, item):
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return -2 if self._sell_by_date_passed(item) else -1
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@staticmethod
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def _sell_by_date_passed(item):
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# sell_in is the number of days left to sell, so on the day it reaches
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# 0 the item goes past its sell-by date as this update runs.
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return item.sell_in <= 0
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@staticmethod
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def _change_quality(item, delta):
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item.quality = max(MIN_QUALITY, min(MAX_QUALITY, item.quality + delta))
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class AgedBrieUpdater(ItemUpdater):
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"""Appreciates at the same rate ordinary items degrade."""
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def _quality_delta(self, item):
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return 2 if self._sell_by_date_passed(item) else 1
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class BackstagePassUpdater(ItemUpdater):
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"""Appreciates faster as the concert approaches, then becomes worthless."""
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def _quality_delta(self, item):
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if self._sell_by_date_passed(item):
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return -item.quality
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if item.sell_in <= 5:
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return 3
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if item.sell_in <= 10:
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return 2
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return 1
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class SulfurasUpdater(ItemUpdater):
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"""Legendary: never has to be sold and never changes."""
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def update(self, item):
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pass
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class ConjuredUpdater(ItemUpdater):
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"""Degrades twice as fast as an ordinary item."""
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def _quality_delta(self, item):
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return 2 * super()._quality_delta(item)
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_UPDATERS_BY_NAME = {
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AGED_BRIE: AgedBrieUpdater(),
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BACKSTAGE_PASS: BackstagePassUpdater(),
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SULFURAS: SulfurasUpdater(),
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}
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_CONJURED_UPDATER = ConjuredUpdater()
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_DEFAULT_UPDATER = ItemUpdater()
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def updater_for(item):
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"""Pick the rule set that applies to an item. Updaters are stateless."""
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if item.name in _UPDATERS_BY_NAME:
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return _UPDATERS_BY_NAME[item.name]
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if item.name.startswith(CONJURED_PREFIX):
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return _CONJURED_UPDATER
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return _DEFAULT_UPDATER
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class Item:
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def __init__(self, name, sell_in, quality):
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self.name = name
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self.sell_in = sell_in
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self.quality = quality
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def __repr__(self):
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return "%s, %s, %s" % (self.name, self.sell_in, self.quality)
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