package keyword

var intern_map map[string]*Keyword

type Keyword struct {
	ns      string
	keyword string
}

func Intern(keyword string) *Keyword {
	return Intern_ns("", keyword)
}

func Intern_ns(ns string, keyword string) *Keyword {
	combined_str := ns + "/" + keyword
	existingkeyword, ok := intern_map[combined_str]
	if ok {
		return existingkeyword
	} else {
		newkeyword := new(Keyword)
		newkeyword.ns = ns
		newkeyword.keyword = keyword
		if intern_map == nil {
			intern_map = make(map[string]*Keyword)
		}
		intern_map[combined_str] = newkeyword
		return newkeyword
	}
}

func String(this *Keyword) string {
	if this.ns == "" {
		return ":" + this.keyword
	}
	return ":" + this.ns + "/" + this.keyword
}

func (this *Keyword) String() string {
	return String(this)
}