mirror of https://github.com/odrling/Aegisub
59 lines
1019 B
Lua
59 lines
1019 B
Lua
local unicode
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unicode = {
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charwidth = function(s, i)
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local b = s:byte(i or 1)
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if not b then
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return 1
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elseif b < 128 then
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return 1
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elseif b < 224 then
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return 2
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elseif b < 240 then
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return 3
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else
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return 4
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end
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end,
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chars = function(s)
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local curchar, i = 0, 1
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return function()
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if i > s:len() then
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return
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end
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local j = i
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curchar = curchar + 1
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i = i + unicode.charwidth(s, i)
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return s:sub(j, i - 1), curchar
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end
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end,
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len = function(s)
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local n = 0
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for c in unicode.chars(s) do
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n = n + 1
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end
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return n
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end,
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codepoint = function(s)
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local b = s:byte(1)
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if b < 128 then
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return b
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end
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local res, w
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if b < 224 then
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res = b - 192
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w = 2
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elseif b < 240 then
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res = b - 224
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w = 3
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else
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res = b - 240
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w = 4
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end
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for i = 2, w do
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res = res * 64 + s:byte(i) - 128
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end
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return res
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end
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}
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return unicode
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