start using global, 100% generic enum to/from string object

git-svn-id: svn://localhost/ardour2/trunk@1246 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 74 insertions, 0 deletions

diff --git a/libs/pbd/pbd/enumwriter.h b/libs/pbd/pbd/enumwriter.h
new file mode 100644
index 0000000000..356a0a1acc
--- /dev/null
+++ b/libs/pbd/pbd/enumwriter.h
@@ -0,0 +1,74 @@
+/* 
+    Copyright (C) 2006 Paul Davis
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+    $Id$
+*/
+
+#include <map>
+#include <string>
+#include <vector>
+#include <exception>
+
+
+namespace PBD {
+
+class unknown_enumeration : public std::exception {
+  public:
+	virtual const char *what() const throw() { return "unknown enumerator in PBD::EnumWriter"; }
+};
+
+class EnumWriter {
+  public:
+	EnumWriter ();
+	~EnumWriter ();
+
+	static EnumWriter& instance() { return *_instance; }
+
+	void register_distinct (std::string type, std::vector<int>, std::vector<std::string>);
+	void register_bits     (std::string type, std::vector<int>, std::vector<std::string>);
+
+	std::string write (std::string type, int value);
+	int         read  (std::string type, std::string value);
+
+  private:
+	struct EnumRegistration {
+	    std::vector<int> values;
+	    std::vector<std::string> names;
+	    bool bitwise;
+
+	    EnumRegistration() {}
+	    EnumRegistration (std::vector<int>& v, std::vector<std::string>& s, bool b) 
+		    : values (v), names (s), bitwise (b) {}
+	};
+
+	typedef std::map<std::string, EnumRegistration> Registry;
+	Registry registry;
+
+	std::string write_bits (EnumRegistration&, int value);
+	std::string write_distinct (EnumRegistration&, int value);
+
+	int read_bits (EnumRegistration&, std::string value);
+	int read_distinct (EnumRegistration&, std::string value);
+
+	static EnumWriter* _instance;
+};
+
+}
+
+#define enum_2_string(e) (PBD::EnumWriter::instance().write (typeid(e).name(), e))
+#define string_2_enum(str,e) (PBD::EnumWriter::instance().read (typeid(e).name(), (str)))
+