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+/* vim: set sw=4 sts=4 et foldmethod=syntax : */
+
+/*
+ * Copyright (c) 2006 Stephen Bennett <spb@gentoo.org>
+ *
+ * This file is part of the Paludis package manager. Paludis is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU General
+ * Public License version 2, as published by the Free Software Foundation.
+ *
+ * Paludis 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., 59 Temple
+ * Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef PALUDIS_GUARD_PALUDIS_DESTRINGIFY_HH
+#define PALUDIS_GUARD_PALUDIS_DESTRINGIFY_HH 1
+
+#include <paludis/util/exception.hh>
+#include <sstream>
+#include <string>
+
+/** \file
+ * Destringify functions.
+ *
+ * \ingroup grpdestringify
+ */
+
+namespace paludis
+{
+ /**
+ * Default exception type thrown by destringify when it fails.
+ *
+ * \ingroup grpdestringify
+ * \ingroup grpexceptions
+ */
+ class PALUDIS_VISIBLE DestringifyError :
+ public Exception
+ {
+ public:
+ ///\name Basic operations
+ ///\{
+
+ DestringifyError(const std::string & str) throw ();
+
+ ///\}
+ };
+
+ /**
+ * For internal use by destringify.
+ *
+ * \ingroup grpdestringify
+ */
+ namespace destringify_internals
+ {
+ /**
+ * Basic destringifier.
+ *
+ * \ingroup grpdestringify
+ */
+ template <typename Type_, typename Exception_>
+ struct Destringifier
+ {
+ /**
+ * Do the destringification.
+ */
+ static Type_ do_destringify(const std::string & s)
+ {
+ std::istringstream ss(s);
+ Type_ t;
+ ss >> t;
+ if (!ss.eof() || ss.bad())
+ throw Exception_(s);
+ return t;
+ }
+ };
+
+ /**
+ * Specialised destringify for std::string.
+ *
+ * \ingroup grpdestringify
+ */
+ template <typename Exception_>
+ struct Destringifier<std::string, Exception_>
+ {
+ /**
+ * Do the destringification.
+ */
+ static std::string do_destringify(const std::string & s)
+ {
+ return s;
+ }
+ };
+
+ /**
+ * Specialised destringify for bool.
+ *
+ * \ingroup grpdestringify
+ */
+ template <typename Exception_>
+ struct Destringifier<bool, Exception_>
+ {
+ /**
+ * Do the destringification.
+ */
+ static bool do_destringify(const std::string & s)
+ {
+ int i;
+ try
+ {
+ i = Destringifier<int, Exception_>::do_destringify(s);
+ return i > 0;
+ }
+ catch (const DestringifyError &)
+ {
+ bool b;
+ std::istringstream ss(s);
+ ss >> std::boolalpha >> b;
+ if (! ss.eof() || ss.bad())
+ throw Exception_(s);
+ return b;
+ }
+ }
+ };
+ }
+
+ /**
+ * Extract a value of some type from a string.
+ *
+ * \ingroup grpdestringify
+ */
+ template <typename Type_, typename Exception_>
+ Type_ destringify(const std::string & s)
+ {
+ if (s == "")
+ throw Exception_("");
+
+ return destringify_internals::Destringifier<Type_, Exception_>::do_destringify(s);
+ }
+
+ template <typename Type_>
+ Type_ destringify(const std::string & s)
+ {
+ return destringify<Type_, DestringifyError>(s);
+ }
+}
+
+#endif