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https://github.com/zero-peak/ZeroOmega.git
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35 lines
969 B
CoffeeScript
35 lines
969 B
CoffeeScript
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Revision =
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fromTime: (time) ->
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time = if time then new Date(time) else new Date()
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return time.getTime().toString(16)
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compare: (a, b) ->
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return 1 if a.length > b.length
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return -1 if a.length < b.length
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return 1 if a > b
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return -1 if a < b
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return 0
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exports.Revision = Revision
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class AttachedCache
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constructor: (opt_prop, @tag) ->
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@prop = opt_prop
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if typeof @tag == 'undefined'
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@tag = opt_prop
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@prop = '_cache'
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get: (obj, otherwise) ->
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tag = @tag(obj)
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cache = @_getCache(obj)
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if cache? and cache.tag == tag
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return cache.value
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value = if typeof otherwise == 'function' then otherwise() else otherwise
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@_setCache(obj, {tag: tag, value: value})
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return value
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_getCache: (obj) -> obj[@prop]
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_setCache: (obj, value) ->
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if not Object::hasOwnProperty.call obj, @prop
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Object.defineProperty obj, @prop, writable: true
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obj[@prop] = value
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exports.AttachedCache = AttachedCache
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