refactor: openpitrix module

Signed-off-by: hongming <talonwan@yunify.com>

vendor/openpitrix.io/openpitrix/pkg/util/stringutil/string.go

@@ -0,0 +1,68 @@
+// Copyright 2018 The OpenPitrix Authors. All rights reserved.
+// Use of this source code is governed by a Apache license
+// that can be found in the LICENSE file.
+
+package stringutil
+
+import (
+	"unicode/utf8"
+
+	"github.com/asaskevich/govalidator"
+)
+
+// Creates an slice of slice values not included in the other given slice.
+func Diff(base, exclude []string) (result []string) {
+	excludeMap := make(map[string]bool)
+	for _, s := range exclude {
+		excludeMap[s] = true
+	}
+	for _, s := range base {
+		if !excludeMap[s] {
+			result = append(result, s)
+		}
+	}
+	return result
+}
+
+func Unique(ss []string) (result []string) {
+	smap := make(map[string]bool)
+	for _, s := range ss {
+		smap[s] = true
+	}
+	for s := range smap {
+		result = append(result, s)
+	}
+	return result
+}
+
+func CamelCaseToUnderscore(str string) string {
+	return govalidator.CamelCaseToUnderscore(str)
+}
+
+func UnderscoreToCamelCase(str string) string {
+	return govalidator.UnderscoreToCamelCase(str)
+}
+
+func FindString(array []string, str string) int {
+	for index, s := range array {
+		if str == s {
+			return index
+		}
+	}
+	return -1
+}
+
+func StringIn(str string, array []string) bool {
+	return FindString(array, str) > -1
+}
+
+func Reverse(s string) string {
+	size := len(s)
+	buf := make([]byte, size)
+	for start := 0; start < size; {
+		r, n := utf8.DecodeRuneInString(s[start:])
+		start += n
+		utf8.EncodeRune(buf[size-start:], r)
+	}
+	return string(buf)
+}