luahatch

var (
	ErrInstructionLimit = errors.New("lua: instruction limit exceeded")
	ErrMemoryLimit      = errors.New("lua: memory limit exceeded")
	ErrTimeout          = errors.New("lua: execution timeout")
	ErrUnsafeOperation  = errors.New("lua: unsafe operation blocked")
)

var BuiltInTemplates = []LuaFilterTemplate{
	{
		Name:   "uppercase",
		Script: `return string.upper(input)`,
	},
	{
		Name:   "lowercase",
		Script: `return string.lower(input)`,
	},
	{
		Name:   "reverse",
		Script: `return string.reverse(input)`,
	},
	{
		Name:   "trim_lines",
		Script: `local lines = {} for line in input:gmatch("[^\n]+") do table.insert(lines, line:gsub("^%s*(.-)%s*$", "%1")) end return table.concat(lines, "\n")`,
	},
	{
		Name:   "remove_empty",
		Script: `local lines = {} for line in input:gmatch("[^\n]+") do if line:gsub("%s", "") ~= "" then table.insert(lines, line) end end return table.concat(lines, "\n")`,
	},
}