Module:LibraryUtil

local libraryUtil = {}

function libraryUtil.checkType( name, argIdx, arg, expectType, nilOk ) if arg == nil and nilOk then return end if type( arg ) ~= expectType then local msg = string.format( "bad argument #%d to '%s' (%s expected, got %s)",			argIdx, name, expectType, type( arg )		) error( msg, 3 ) end end

function libraryUtil.checkTypeMulti( name, argIdx, arg, expectTypes ) local argType = type( arg ) for _, expectType in ipairs( expectTypes ) do		if argType == expectType then return end end local n = #expectTypes local typeList if n > 1 then typeList = table.concat( expectTypes, ', ', 1, n - 1 ) .. ' or ' .. expectTypes[n] else typeList = expectTypes[1] end local msg = string.format( "bad argument #%d to '%s' (%s expected, got %s)",		argIdx,		name,		typeList,		type( arg )	) error( msg, 3 ) end

function libraryUtil.checkTypeForIndex( index, value, expectType ) if type( value ) ~= expectType then local msg = string.format( "value for index '%s' must be %s, %s given",			index, expectType, type( value )		) error( msg, 3 ) end end

function libraryUtil.checkTypeForNamedArg( name, argName, arg, expectType, nilOk ) if arg == nil and nilOk then return end if type( arg ) ~= expectType then local msg = string.format( "bad named argument %s to '%s' (%s expected, got %s)",			argName, name, expectType, type( arg )		) error( msg, 3 ) end end

function libraryUtil.makeCheckSelfFunction( libraryName, varName, selfObj, selfObjDesc ) return function ( self, method ) if self ~= selfObj then error( string.format( "%s: invalid %s. Did you call %s with a dot instead of a colon, i.e. " .. "%s.%s instead of %s:%s?", libraryName, selfObjDesc, method, varName, method, varName, method ), 3 )		end end end

return libraryUtil