merge

spike/review/reinvent/ezmded/server/id.go

@@ -0,0 +1,51 @@
+package main
+
+import (
+	"net/url"
+	"os"
+	"path"
+	"strings"
+)
+
+type ID string
+
+func NewID(s string) ID {
+	return ID(path.Clean(s)).withClean()
+}
+
+func (id ID) Push(child string) ID {
+	return ID(path.Join(id.String(), child)).withClean()
+}
+
+func (id ID) Pop() ID {
+	pid := path.Clean(ID(path.Dir(id.String())).withClean().String())
+	if strings.HasPrefix(pid, ".") {
+		return ""
+	}
+	return NewID(pid)
+}
+
+func (id ID) URLSafeString() string {
+	splits := strings.Split(string(id), "/")
+	for i := range splits {
+		splits[i] = url.PathEscape(splits[i])
+	}
+	return strings.Join(splits, "/")
+}
+
+func (id ID) String() string {
+	return string(id)
+}
+
+func (id ID) withClean() ID {
+	splits := strings.Split(id.String(), string([]rune{os.PathSeparator}))
+	for i := range splits {
+		splits[i] = strings.Trim(splits[i], string([]rune{os.PathSeparator}))
+		splits[i] = strings.Trim(splits[i], "/")
+		t, err := url.PathUnescape(splits[i])
+		if err == nil {
+			splits[i] = t
+		}
+	}
+	return ID(path.Join(splits...))
+}