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, 194 insertions, 0 deletions

diff --git a/libs/pbd/enumwriter.cc b/libs/pbd/enumwriter.cc
new file mode 100644
index 0000000000..c42cc3a5c2
--- /dev/null
+++ b/libs/pbd/enumwriter.cc
@@ -0,0 +1,194 @@
+/* 
+    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 <pbd/enumwriter.h>
+#include <pbd/error.h>
+#include <pbd/compose.h>
+
+using namespace std;
+using namespace PBD;
+
+#include "i18n.h"
+
+EnumWriter* EnumWriter::_instance = 0;
+
+EnumWriter::EnumWriter ()
+{
+	if (_instance == 0) {
+		_instance = this;
+	}
+}
+
+EnumWriter::~EnumWriter ()
+{
+}
+
+void
+EnumWriter::register_distinct (string type, vector<int> v, vector<string> s)
+{
+	pair<string,EnumRegistration> newpair;
+	pair<Registry::iterator,bool> result;
+
+	newpair.first = type;
+	newpair.second = EnumRegistration (v, s, false);
+	
+	result = registry.insert (newpair);
+
+	if (!result.second) {
+		warning << string_compose (_("enum type \"%1\" already registered with the enum writer"), type) << endmsg;
+	}
+}
+
+void
+EnumWriter::register_bits (string type, vector<int> v, vector<string> s)
+{
+	pair<string,EnumRegistration> newpair;
+	pair<Registry::iterator,bool> result;
+
+	newpair.first = type;
+	newpair.second = EnumRegistration (v, s, true);
+	
+	result = registry.insert (newpair);
+
+	if (!result.second) {
+		warning << _("enum type \"%1\" already registered with the enum writer") << endmsg;
+	}
+}
+
+string
+EnumWriter::write (string type, int value)
+{
+	Registry::iterator x = registry.find (type);
+
+	if (x == registry.end()) {
+		error << string_compose (_("EnumWriter: unknown enumeration type \"%1\""), type) << endmsg;
+		throw unknown_enumeration();
+	}
+
+	if (x->second.bitwise) {
+		return write_bits (x->second, value);
+	} else {
+		return write_distinct (x->second, value);
+	}
+}
+
+int
+EnumWriter::read (string type, string value)
+{
+	Registry::iterator x = registry.find (type);
+
+	if (x == registry.end()) {
+		error << string_compose (_("EnumWriter: unknown enumeration type \"%1\""), type) << endmsg;
+		throw unknown_enumeration();
+	}
+
+	if (x->second.bitwise) {
+		return read_bits (x->second, value);
+	} else {
+		return read_distinct (x->second, value);
+	}
+}	
+
+string
+EnumWriter::write_bits (EnumRegistration& er, int value)
+{
+	vector<int>::iterator i;
+	vector<string>::iterator s;
+	string result;
+
+	for (i = er.values.begin(), s = er.names.begin(); i != er.values.end(); ++i, ++s) {
+		if (value & (*i)) {
+			if (!result.empty()) {
+				result += ',';
+			} 
+			result += (*s);
+		}
+	}
+
+	return result;
+}
+
+string
+EnumWriter::write_distinct (EnumRegistration& er, int value)
+{
+	vector<int>::iterator i;
+	vector<string>::iterator s;
+
+	for (i = er.values.begin(), s = er.names.begin(); i != er.values.end(); ++i, ++s) {
+		if (value == (*i)) {
+			return (*s);
+		}
+	}
+
+	return string();
+}
+
+int
+EnumWriter::read_bits (EnumRegistration& er, string str)
+{
+	vector<int>::iterator i;
+	vector<string>::iterator s;
+	int result = 0;
+	bool found = false;
+	string::size_type comma;
+
+	do {
+		
+		comma = str.find_first_of (',');
+		string segment = str.substr (0, comma);
+
+		for (i = er.values.begin(), s = er.names.begin(); i != er.values.end(); ++i, ++s) {
+			if (segment == (*s)) {
+				result |= (*i);
+				found = true;
+			}
+		}
+
+		if (comma == string::npos) {
+			break;
+		}
+
+		str = str.substr (comma+1);
+
+	} while (true);
+
+	if (!found) {
+		throw unknown_enumeration();
+	}
+
+	return result;
+}
+
+int
+EnumWriter::read_distinct (EnumRegistration& er, string str)
+{
+	vector<int>::iterator i;
+	vector<string>::iterator s;
+
+	for (i = er.values.begin(), s = er.names.begin(); i != er.values.end(); ++i, ++s) {
+		if (str == (*s)) {
+			return (*i);
+		}
+	}
+
+	throw unknown_enumeration();
+}
+
+