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| --
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| -- Tests basic properties of parameters.
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| --
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| local p = {}
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|
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| --
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| -- Tests if the parameter is empty, all white space, or undefined.
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| --
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|
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| function p.is_empty(arg)
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| return not string.find(arg or '', '%S')
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| end
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|
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| --
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| -- Returns the parameter if it has any content.
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| --
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|
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| function p.default_to(arg, default)
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| if string.find(arg or '', '%S') then
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| return arg
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| else
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| return default
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| end
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| end
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|
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| --
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| -- Returns a list of parameters if they have any content.
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| --
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| function p.defaults(...)
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| local ret = {}
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| for i, v in ipairs(...) do
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| if string.find(v[1] or '', '%S') then
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| table.insert(ret,v[1])
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| else
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| -- or false, because nil is removed
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| table.insert(ret,v[2] or false)
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| end
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| end
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| return unpack(ret)
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| end
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|
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| --
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| -- Tests if the parameter has content.
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| --
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|
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| function p.has_content(arg)
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| return string.find(arg or '', '%S')
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| end
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|
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| --
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| -- Uppercase the first letter.
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| --
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| function p.ucfirst(arg)
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| if not arg or arg:len() == 0 then
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| return nil
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| elseif arg:len() == 1 then
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| return arg:upper()
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| else
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| return arg:sub(1,1):upper() .. arg:sub(2)
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| end
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| end
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|
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| --
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| -- Uppercase the first letter, lowercase everything else.
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| --
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|
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| function p.ucflc(arg)
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| if not arg or arg:len() == 0 then
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| return nil
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| elseif arg:len() == 1 then
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| return arg:upper()
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| else
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| return arg:sub(1,1):upper() .. arg:sub(2):lower()
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| end
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| end
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| return p
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