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25 lines
572 B
Lua
25 lines
572 B
Lua
local string_char = string.char
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local utf8 = {}
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function utf8.char(codepoint)
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if codepoint <= 0x007F then
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-- Single byte
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return string_char(codepoint)
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end
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if codepoint < 0x00A0 or codepoint > 0x10FFFF then
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-- Out of range
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return -- TODO (?) error instead
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end
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local result = ""
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local i = 0
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repeat
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local remainder = codepoint % 64
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result = string_char(128 + remainder) .. result
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codepoint = (codepoint - remainder) / 64
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i = i + 1
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until codepoint <= 2 ^ (8 - i - 2)
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return string_char(0x100 - 2 ^ (8 - i - 1) + codepoint) .. result
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end
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return utf8 |