Unsubst

local checkType = require('libraryUtil').checkType  local p = {}  local BODY_PARAM = '$B'  local specialParams = { ['$params'] = 'parameter list', ['$aliases'] = 'parameter aliases', ['$flags'] = 'flags', ['$B'] = 'template content' }  function p.main(frame, body) -- If we are substing, this function returns a template invocation, and if -- not, it returns the template body. The template body can be specified in -- the body parameter, or in the template parameter defined in the -- BODY_PARAM variable. This function can be called from Lua or from -- #invoke.  -- Return the template body if we aren't substing. if not mw.isSubsting() then if body ~= nil then return body elseif frame.args[BODY_PARAM] ~= nil then return frame.args[BODY_PARAM] else error(string.format( "no template content specified (use parameter '%s' from #invoke)", BODY_PARAM ), 2) end end  -- Sanity check for the frame object. if type(frame) ~= 'table' or type(frame.getParent) ~= 'function' or not frame:getParent() then error( "argument #1 to 'main' must be a frame object with a parent " .. "frame available", 2 ) end  -- Find the invocation name. local mTemplateInvocation = require('Module:Template invocation') local name = mTemplateInvocation.name(frame:getParent():getTitle())  -- Combine passed args with passed defaults local args = {} if string.find( ','..(frame.args['$flags'] or '')..',', ',%s*override%s*,' ) then for k, v in pairs( frame:getParent().args ) do args[k] = v end for k, v in pairs( frame.args ) do if not specialParams[k] then if v == '__DATE__' then v = mw.getContentLanguage():formatDate( 'F Y' ) end args[k] = v end end else for k, v in pairs( frame.args ) do if not specialParams[k] then if v == '__DATE__' then v = mw.getContentLanguage():formatDate( 'F Y' ) end args[k] = v end end for k, v in pairs( frame:getParent().args ) do args[k] = v end end  -- Trim parameters, if not specified otherwise if not string.find( ','..(frame.args['$flags'] or '')..',', ',%s*keep%-whitespace%s*,' ) then for k, v in pairs( args ) do args[k] = mw.ustring.match(v, '^%s*(.*)%s*$') or '' end end  -- Pull information from parameter aliases local aliases = {} if frame.args['$aliases'] then local list = mw.text.split( frame.args['$aliases'], '%s*,%s*' ) for k, v in ipairs( list ) do local tmp = mw.text.split( v, '%s*>%s*' ) aliases[tonumber(mw.ustring.match(tmp[1], '^[1-9][0-9]*$')) or tmp[1]] = ((tonumber(mw.ustring.match(tmp[2], '^[1-9][0-9]*$'))) or tmp[2]) end end for k, v in pairs( aliases ) do if args[k] and ( not args[v] or args[v] == '' ) then args[v] = args[k] end args[k] = nil end  -- Remove empty parameters, if specified if string.find( ','..(frame.args['$flags'] or '')..',', ',%s*remove%-empty%s*,' ) then local tmp = 0 for k, v in ipairs( args ) do if v ~= '' or ( args[k+1] and args[k+1] ~= '' ) or ( args[k+2] and args[k+2] ~= '' ) then tmp = k else break end end for k, v in pairs( args ) do if v == '' then if not (type(k) == 'number' and k < tmp) then args[k] = nil end end end end  -- Order parameters if frame.args['$params'] then local params, tmp = mw.text.split( frame.args['$params'], '%s*,%s*' ), {} for k, v in ipairs(params) do v = tonumber(mw.ustring.match(v, '^[1-9][0-9]*$')) or v if args[v] then tmp[v], args[v] = args[v], nil end end for k, v in pairs(args) do tmp[k], args[k] = args[k], nil end args = tmp end  return mTemplateInvocation.invocation(name, args) end  p[''] = p.main -- For backwards compatibility  return p