// Package lexer provides basic helpers to implement parsers
package lexer

// StateFn is a State Function of the parser
type StateFn func() (StateFn, error)

// Run runs a state machine until the state function either
// returns nil or an error
func Run(fn StateFn) error {
	for fn != nil {
		var err error

		fn, err = fn()
		if err != nil {
			// failed
			return err
		}
	}

	// ended
	return nil
}