49 lines
799 B
Plaintext
49 lines
799 B
Plaintext
local type InputStream = record
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str: string
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offset: number
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refill: function(): string
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end
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local istream_mt = {__index = InputStream}
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function InputStream:_manageBuffer()
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if self.offset > #self.str then
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self.str = self.refill()
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self.offset = 1
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end
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end
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-- constructors
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function InputStream:new(): InputStream
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return setmetatable(
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{
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string = "",
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offset = 1
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} as InputStream,
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istream_mt)
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end
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-- setters/getters
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function InputStream:setRefill(func: function(): string)
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self.refill = func
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end
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--
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function InputStream:readCurrentCharacter(): string
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self:_manageBuffer()
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return self.str:sub(self.offset, 1)
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end
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function InputStream:advanceOffset(): string
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self.offset = self.offset + 1
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self:_manageBuffer()
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return self.str:sub(self.offset, 1)
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end
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return InputStream
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