add keys()

src/lib/ebus/stringhelper.cpp

@@ -521,4 +521,15 @@ void StringReplacers::reduce(bool compress) {
   } while (reduced);
 }
 
+vector<string> StringReplacers::keys() const {
+  vector<string> ret;
+  for (auto& it : m_constants) {
+    ret.push_back(it.first);
+  }
+  for (auto& it : m_replacers) {
+    ret.push_back(it.first);
+  }
+  return ret;
+}
+
 }  // namespace ebusd

src/lib/ebus/stringhelper.h

@@ -263,6 +263,12 @@ class StringReplacers {
    */
   void reduce(bool compress = false);
 
+  /**
+   * Get all set keys.
+   * @return the set keys.
+   */
+  vector<string> keys() const;
+
  private:
   /** constant values from the integration file. */
   map<string, string> m_constants;