Module:Yesno

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This is a meta module.

This module is meant to be used only by other modules. It should not be invoked in wikitext.

This module was adapted from Module:Yesno on Wikipedia.
Adaptation is noted for reference and attribution only. This module may differ from the original in function or in usage. The documentation on Wikipedia may be helpful in understanding this module.

The above documentation is transcluded from Module:Yesno/doc. (edit | history)
Editors can experiment in this module's sandbox (create | mirror) and testcases (create) pages.
Subpages of this module.

local p = {}
 
function p.yesno(frame)
 
    -- defaults
    local retvals = {
        yes   = "yes",
        no    = "",
        ["¬"] = ""
    }
 
    -- Allow arguments to override defaults.
    -- 'any' tracks the presence of any arguments at all.
    local args = frame.args
    local any = false
    for k,v in pairs(args) do
        any = true
        retvals[k] = v
    end
    -- If there are no arguments, try and get them from the parent frame.
    if any == false then
        local pframe = frame:getParent()
        args = pframe.args
        for k,v in pairs(args) do
            any = true
            retvals[k] = v
        end
    end    
 
    val = args[1]
 
    -- According to the template docs, the input should be considered nil
    -- only when no params were provided. If any params at all were present,
    -- the value must be considered blank. A bit weird, if you ask me.
    if (val == nil and not any) or val == '¬' then
        return retvals['¬']
    end
 
    val = (val or ''):lower()          -- Coerce to blank if nil; make lowercase.
    val = val:match'^%s*(.*%S)' or ''  -- Trim whitespace.
 
    if val == '' then
        return retvals['blank'] ~= nil and retvals['blank'] or retvals['no']
    elseif val == 'n' or val == 'no'  or val == '0' then
        return retvals['no']
    elseif val == 'y' or val == 'yes' or val == '1' or retvals['def'] == nil then
        return retvals['yes']
    else
        return retvals['def']
    end
end
 
return p