init commit

keyword/keyword.go

@@ -0,0 +1,40 @@
+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)
+}