implementation + compile as independent module

src/websock/EndpointUtil.cpp

@@ -0,0 +1,38 @@
+/* file EndpointUtil.cpp
+ *
+ * author: Roland Conybeare, Sep 2022
+ */
+
+#include "EndpointUtil.hpp"
+
+namespace xo {
+    namespace web {
+        std::string
+        EndpointUtil::stem(std::string const & pattern)
+        {
+            std::size_t p = 0;
+            do {
+                p = pattern.find_first_of("$", p);
+
+                if ((p != std::string::npos) && (pattern[p+1] == '{')) {
+                    /* fixed stem is chars [0 .. p-1],  i.e. 1st p characters */
+                    break;
+                }
+
+                if (p != std::string::npos) {
+                    /* skip to next '$' */
+                    ++p;
+                }
+            } while (p != std::string::npos);
+
+            if (p == std::string::npos) {
+                /* pattern has no variable components */
+                return pattern;
+            } else {
+                return pattern.substr(0, p);
+            }
+        } /*stem*/
+    } /*namespace web*/
+} /*namespace xo*/
+
+/* end EndpointUtil.cpp */