From ad340b52a0a4e86edd5b54b01d74aac731a6a812 Mon Sep 17 00:00:00 2001
From: Stijn Buys <ingar@osirion.org>
Date: Mon, 4 Feb 2008 18:44:17 +0000
Subject: basic cvar implementation

---
 src/core/Makefile.am |  4 +--
 src/core/cvar.cc     | 92 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/core/cvar.h      | 63 +++++++++++++++++++++++++++++++++++
 3 files changed, 157 insertions(+), 2 deletions(-)
 create mode 100644 src/core/cvar.cc
 create mode 100644 src/core/cvar.h

diff --git a/src/core/Makefile.am b/src/core/Makefile.am
index 27477dc..8afa759 100644
--- a/src/core/Makefile.am
+++ b/src/core/Makefile.am
@@ -1,13 +1,13 @@
 METASOURCES = AUTO
 INCLUDES = -I$(top_srcdir)/src
 
-libcore_la_SOURCES = applicationinterface.cc commandbuffer.cc func.cc \
+libcore_la_SOURCES = applicationinterface.cc commandbuffer.cc cvar.cc func.cc \
 	gameinterface.cc
 libcore_la_LDFLAGS = -avoid-version -no-undefined
 libcore_la_LIBADD = $(top_builddir)/src/math/libmath.la \
 	$(top_builddir)/src/sys/libsys.la $(top_builddir)/src/filesystem/libfilesystem.la
 
 noinst_LTLIBRARIES = libcore.la
-noinst_HEADERS = applicationinterface.h commandbuffer.h core.h func.h \
+noinst_HEADERS = applicationinterface.h commandbuffer.h core.h cvar.h func.h \
 	gameinterface.h
 
diff --git a/src/core/cvar.cc b/src/core/cvar.cc
new file mode 100644
index 0000000..ef3f06c
--- /dev/null
+++ b/src/core/cvar.cc
@@ -0,0 +1,92 @@
+/*
+   core/cvar.cc
+   This file is part of the Osirion project and is distributed under 
+   the terms of the GNU General Public License version 2 
+*/
+
+#include "cvar.h"
+#include <map>
+
+namespace core {
+
+Cvar_t::Cvar_t(const char *cvarname, unsigned int cvarflags)
+{
+	cvar_name.assign(cvarname);
+	cvar_flags = cvarflags;
+}
+
+Cvar_t::Cvar_t(const std::string &cvarname, unsigned int cvarflags)
+{
+	cvar_name = cvarname;
+	cvar_flags = cvarflags;
+}
+
+Cvar_t & Cvar_t::operator=(const std::string &cvarvalue)
+{
+	cvar_value = cvarvalue;
+	return (*this);
+}
+
+Cvar_t & Cvar_t::operator=(const char *cvarvalue)
+{
+	cvar_value.assign(cvarvalue);
+	return (*this);
+}
+
+Cvar_t & Cvar_t::operator=(int cvarvalue)
+{
+	std::stringstream s;
+	s << cvarvalue;
+	s >> cvar_value;
+	return (*this);
+}
+
+namespace cvar 
+{
+
+std::map<std::string, Cvar> registry;
+
+Cvar set(const char *cvarname, const char *value)
+{
+	Cvar c = registry[std::string(cvarname)];
+	if (!c) {
+		// not found, create a new variable and assign value
+		c = new Cvar_t(cvarname);
+		registry[std::string(cvarname)] = c;
+		(*c) = value;
+	}
+	return c;
+}
+
+void unset(const char *cvarname)
+{
+	Cvar c = registry[std::string(cvarname)];
+	if (c) {
+		registry.erase(std::string(cvarname));
+		delete c;
+	}
+}
+
+void unset(const std::string &cvarname)
+{
+	Cvar c = registry[cvarname];
+	if (c) {
+		registry.erase(cvarname);
+		delete c;
+	}
+}
+
+Cvar find(const std::string &cvarname)
+{
+	return registry[cvarname];
+}
+
+Cvar find(const char *cvarname)
+{
+	return registry[std::string(cvarname)];
+}
+	
+} // namespace cvar
+
+} // namespace core
+
diff --git a/src/core/cvar.h b/src/core/cvar.h
new file mode 100644
index 0000000..f407395
--- /dev/null
+++ b/src/core/cvar.h
@@ -0,0 +1,63 @@
+/*
+   core/cvar.h
+   This file is part of the Osirion project and is distributed under 
+   the terms of the GNU General Public License version 2 
+*/
+
+#ifndef __INCLUDED_CORE_CVAR_H__
+#define __INCLUDED_CORE_CVAR_H__
+
+#include <sstream>
+
+namespace core {
+
+/** new cvars have to be added through the cvar::set functions
+ *  and not created directly.
+ */
+class Cvar_t {
+public:
+	Cvar_t(const char *cvarname, unsigned int cvarflags = 0);
+	Cvar_t(const std::string &cvarname, unsigned int cvarflags = 0);
+
+	inline const std::string &name() const { return cvar_name; }
+	inline const std::string &value() const {return cvar_value; }
+
+	Cvar_t &operator=(const char *cvarvalue);
+	Cvar_t &operator=(const std::string &cvarvalue);
+	Cvar_t &operator=(int cvarvalue);
+
+private:
+	std::string cvar_name;
+	std::string cvar_value;
+	unsigned int cvar_flags;
+};
+
+typedef Cvar_t *Cvar;
+
+/// the cvar registry
+namespace cvar 
+{
+
+/// create a new cvar containing a string value
+Cvar set(const char *cvarname, const char *value);
+
+/// create a new cvar containing an integer value
+Cvar set(const char *cvarname, int value);
+
+/// delete a cvar
+void unset(const char *cvarname);
+
+// delete a cvar
+void unset(const std::string &cvarname);
+
+/// search for a named cvar, returns 0 if not found
+Cvar find(const std::string &cvarname);
+/// search for a named cvar, returns 0 if not found
+Cvar find(const char *cvarname);
+
+} // namespace cvar
+
+} // namespace core
+
+#endif // __INCLUDED_CORE_CVAR_H__
+
-- 
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