50 lines
978 B
Lua
50 lines
978 B
Lua
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-- basic.lua
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local basic = {}
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package.loaded[...] = basic
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function basic.index(table, item)
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for k, v in pairs(table) do
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if v == item then return k end
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end
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end
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function basic.map(table, func)
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local t = {}
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for k, v in pairs(table) do
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t[k] = func(v)
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end
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return t
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end
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function basic.matchstr(str, pat)
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local t = {}
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for i in str:gmatch(pat) do
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t[#t + 1] = i
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end
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return t
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end
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function basic.utf8chars(str, ...)
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local chars = {}
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for pos, code in utf8.codes(str) do
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chars[#chars + 1] = utf8.char(code)
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end
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return chars
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end
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function basic.utf8sub(str, first, ...)
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local last = ...
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if last == nil or last > utf8.len(str) then
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last = utf8.len(str)
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elseif last < 0 then
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last = utf8.len(str) + 1 + last
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end
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local fstoff = utf8.offset(str, first)
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local lstoff = utf8.offset(str, last + 1)
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if fstoff == nil then fstoff = 1 end
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if lstoff ~= nil then lstoff = lstoff - 1 end
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return string.sub(str, fstoff, lstoff)
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end
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