operator== for Directives, skips reparse if equal

source/core/StarDirectives.cpp

@@ -62,6 +62,32 @@ Directives::Directives(const char* directives) {
   parse(directives);
 }
 
+Directives& Directives::operator=(String const& directives) {
+  if (shared && shared->string == directives)
+    return *this;
+
+  parse(String(directives));
+  return *this;
+}
+
+Directives& Directives::operator=(String&& directives) {
+  if (shared && shared->string == directives) {
+    directives.clear();
+    return *this;
+  }
+
+  parse(move(directives));
+  return *this;
+}
+
+Directives& Directives::operator=(const char* directives) {
+  if (shared && shared->string.utf8().compare(directives) == 0)
+    return *this;
+
+  parse(directives);
+  return *this;
+}
+
 void Directives::loadOperations() const {
   if (!shared)
     return;

source/core/StarDirectives.hpp

@@ -45,6 +45,10 @@ public:
   Directives(String&& directives);
   Directives(const char* directives);
 
+  Directives& operator=(String const& s);
+  Directives& operator=(String&& s);
+  Directives& operator=(const char* s);
+
   void loadOperations() const;
   void parse(String&& directives);
   String string() const;