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Module:Yesno

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--[[
{{Helper module|name=Yesno
|fname1=(arg)
|ftype1=Any value
|fuse1=Reads arg for yes/no and returns the appropriate boolean or nil
|fname2=(arg1,arg2)
|ftype2=Any value, Any value
|fuse2=Reads arg1 for yes/no and returns the appropriate boolean; returns arg2 if arg1 was not an applicable value
}}
--]]
-- <pre>
-- Used to evaluate args to booleans where applicable
--
-- Based on <https://en.wikipedia.org/wiki/Module:Yesno>
-- see page history there for contributors
--
 
return function( arg, default )
    arg = type( arg ) == 'string' and mw.ustring.lower( arg ) or arg
 
    if arg == nil then
        return nil
    end
 
    if
        arg == 'yes' or
        arg == 'y' or
        arg == 'true' or
        tonumber( arg ) ==  1
    then
        return true
    end
 
    if
        arg == 'no' or
        arg == 'n' or
        arg == 'false' or
        arg == '' or
        tonumber( arg ) == 0
    then
        return false
    end
 
    return default
end

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