// 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 {
	var err error

	for fn != nil && err == nil {
		fn, err = fn()
	}

	return err
}