refactor(serverHandler): simplify alias into one type

Author: marjune163

src/serverHandler/alias.go

@@ -0,0 +1,49 @@
+package serverHandler
+
+import (
+	"../util"
+	"strings"
+)
+
+type alias struct {
+	url string
+	fs  string
+}
+
+func createAlias(urlPath, fsPath string) alias {
+	return alias{urlPath, fsPath}
+}
+
+func (alias alias) isMatch(rawReqPath string) bool {
+	return util.IsPathEqual(alias.url, rawReqPath)
+}
+
+func (alias alias) isSuccessorOf(rawReqPath string) bool {
+	return len(alias.url) > len(rawReqPath) && util.HasUrlPrefixDir(alias.url, rawReqPath)
+}
+
+func (alias alias) isPredecessorOf(rawReqPath string) bool {
+	return len(rawReqPath) > len(alias.url) && util.HasUrlPrefixDir(rawReqPath, alias.url)
+}
+
+func (alias alias) nextPartOf(rawReqPath string) (subName string, noMore, ok bool) {
+	if !alias.isSuccessorOf(rawReqPath) {
+		return
+	}
+
+	subName = alias.url[len(rawReqPath):]
+	if len(subName) > 0 && subName[0] == '/' {
+		subName = subName[1:]
+	}
+
+	slashIndex := strings.IndexByte(subName, '/')
+	if slashIndex > 0 {
+		subName = subName[:slashIndex]
+	} else {
+		noMore = true
+	}
+
+	ok = true
+
+	return
+}