Editing Module:Yesno

local p = {}

function p.yesno(frame)

    -- defaults
    local retvals = {
        yes   = "yes",
        no    = "",
        ["¬"] = ""
    }

    -- Allow arguments to override defaults. Arguments are taken from
    -- the parent frame; other arguments are ignored.
    for k,v in pairs(frame:getParent().args) do
        retvals[k] = v
    end

    val = frame:getParent().args[1]

    -- First deal with the case if val is nil, then deal with other cases.
    if val == nil then
        return retvals['¬']
    end

    val = val:lower()          -- Make lowercase.
    val = val:match'^%s*(.*%S)' or ''  -- Trim whitespace.

    -- Cases are ordered by (probable) likelihood of use. 
    if val == '' then
        return retvals['blank'] or retvals['no']
    elseif val == 'yes' then
        return retvals['yes']
    elseif val == 'no' then
        return retvals['no']
    elseif val == 'y' then
        return retvals['yes']
    elseif val == 'n' then
        return retvals['no']
    elseif val == '¬' then
        return retvals['¬']
    elseif tonumber(val) == 1 then
        return retvals['yes']
    elseif tonumber(val) == 0 then
        return retvals['no']
    else
        return retvals['def'] or retvals['yes']
    end
end

return p
@@ Line 1: / Line 1: @@
--- Function allowing for consistent treatment of boolean-like wikitext input.
+local p = {}
--- It works similarly to the template {{yesno}}.
-return function (val, default)
+function p.yesno(frame)
-	-- If your wiki uses non-ascii characters for any of "yes", "no", etc., you
-	-- should replace "val:lower()" with "mw.ustring.lower(val)" in the
+    -- defaults
-	-- following line.
+    local retvals = {
-	val = type(val) == 'string' and val:lower() or val
+        yes   = "yes",
-	if val == nil then
+        no    = "",
-		return nil
+        ["¬"] = ""
-	elseif val == true
+    }
-		or val == 'yes'
-		or val == 'y'
+    -- Allow arguments to override defaults. Arguments are taken from
-		or val == 'true'
+    -- the parent frame; other arguments are ignored.
-		or val == 't'
+    for k,v in pairs(frame:getParent().args) do
-		or val == 'on'
+        retvals[k] = v
-		or tonumber(val) == 1
+    end
-	then
-		return true
+    val = frame:getParent().args[1]
-	elseif val == false
-		or val == 'no'
+    -- First deal with the case if val is nil, then deal with other cases.
-		or val == 'n'
+    if val == nil then
-		or val == 'false'
+        return retvals['¬']
-		or val == 'f'
+    end
-		or val == 'off'
-		or tonumber(val) == 0
+    val = val:lower()          -- Make lowercase.
-	then
+    val = val:match'^%s*(.*%S)' or ''  -- Trim whitespace.
-		return false
-	else
+    -- Cases are ordered by (probable) likelihood of use.
-		return default
+    if val == '' then
-	end
+        return retvals['blank'] or retvals['no']
+    elseif val == 'yes' then
+        return retvals['yes']
+    elseif val == 'no' then
+        return retvals['no']
+    elseif val == 'y' then
+        return retvals['yes']
+    elseif val == 'n' then
+        return retvals['no']
+    elseif val == '¬' then
+        return retvals['¬']
+    elseif tonumber(val) == 1 then
+        return retvals['yes']
+    elseif tonumber(val) == 0 then
+        return retvals['no']
+    else
+        return retvals['def'] or retvals['yes']
+    end
 end
+return p