rules

type Context struct {
	Text string

	// accumulator of relative values
	Duration time.Duration

	// Aboslute values
	Year, Month, Weekday, Day, Hour, Minute, Second *int

	Location *time.Location
}

type F struct {
	RegExp  *regexp.Regexp
	Applier func(*Match, *Context, *Options, time.Time) (bool, error)
}

type Match struct {
	Left, Right int
	Text        string
	Captures    []string
	Order       float64
	Applier     func(*Match, *Context, *Options, time.Time) (bool, error)
}

type MatchByIndex []*Match

type MatchByOrder []*Match

type Options struct {
	Afternoon, Evening, Morning, Noon int

	Distance int

	MatchByOrder bool
}

type Rule interface {
	Find(string) *Match
}

type Strategy int

type TimePrecision = time.Duration