feat add StrJoin

CMakeLists.txt

@@ -28,6 +28,7 @@ target_sources(
           src/network/socket_address.cc
           src/network/socket_server.cc
           src/strings/base64.cc
+          src/strings/utils.cc
           src/synchronization/event.cc
           src/synchronization/mutex.cc
           src/synchronization/sequence_checker_internal.cc

include/sled/strings/utils.h

@@ -1,10 +1,15 @@
 #ifndef SLED_STRINGS_UTILS_H
 #define SLED_STRINGS_UTILS_H
+#include <string>
+
 namespace sled {
 
 std::string ToLower(const std::string &str);
 std::string ToUpper(const std::string &str);
 std::string ToHex(const std::string &str);
+std::string StrJoin(const std::vector<std::string> &strings,
+                    const std::string &delim,
+                    bool skip_empty = false);
 
 }// namespace sled
 #endif//   SLED_STRINGS_UTILS_H

src/strings/utils.cc

@@ -0,0 +1,23 @@
+#include "sled/strings/utils.h"
+#include <sstream>
+
+namespace sled {
+
+std::string
+StrJoin(const std::vector<std::string> &strings,
+        const std::string &delim,
+        bool skip_empty)
+{
+    if (strings.empty()) { return ""; }
+
+    std::stringstream ss;
+    size_t i = 0;
+    while (skip_empty && i < strings.size() && strings[i].empty()) { ++i; }
+    if (i < strings.size()) { ss << strings[i++]; }
+    for (; i < strings.size(); ++i) {
+        if (skip_empty && strings[i].empty()) { continue; }
+        ss << delim << strings[i];
+    }
+    return ss.str();
+}
+}// namespace sled