string list joining, and a test case for that and splitting.

simgear/misc/strutils.cxx

@@ -278,6 +278,19 @@ namespace simgear {
         return v1parts.size() - v2parts.size();
     }
     
+    string join(const string_list& l, const string& joinWith)
+    {
+        string result;
+        unsigned int count = l.size();
+        for (unsigned int i=0; i < count; ++i) {
+            result += l[i];
+            if (i < (count - 1)) {
+                result += joinWith;
+            }
+        }
+        
+        return result;
+    }
     
     } // end namespace strutils
     

simgear/misc/strutils.hxx

@@ -33,6 +33,7 @@
 #include <vector>
 #include <cstdlib>
 
+typedef std::vector < std::string > string_list;
 
 namespace simgear {
   namespace strutils {
@@ -93,11 +94,17 @@ namespace simgear {
 	 * resulting in at most maxsplit+1 words.
 	 * @return Array of words.
 	 */
-	std::vector<std::string>
+	string_list
 	split( const std::string& s,
 	       const char* sep = 0,
 	       int maxsplit = 0 );
 
+       /**
+        * create a single string by joining the elements of a list with
+        * another string.
+        */
+       std::string join(const string_list& l, const std::string& joinWith = "");
+
 	/**
 	 * Test if a string starts with a string 
 	 *

simgear/misc/strutils_test.cxx

@@ -63,6 +63,20 @@ int main (int ac, char ** av)
 // since we compare numerically, leasing zeros shouldn't matter
     VERIFY(compare_versions("0.06.7", "0.6.07") == 0);
     
+    string_list la = split("zero one two three four five");
+    COMPARE(la[2], "two");
+    COMPARE(la[5], "five");
+    COMPARE(la.size(), 6);
+    
+    string_list lb = split("alpha:beta:gamma:delta", ":", 2);
+    COMPARE(lb.size(), 3);
+    COMPARE(lb[0], "alpha");
+    COMPARE(lb[1], "beta");
+    COMPARE(lb[2], "gamma:delta");
+    
+    std::string j = join(la, "&");
+    COMPARE(j, "zero&one&two&three&four&five");
+    
     cout << "all tests passed successfully!" << endl;
     return 0;
 }