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+/* vim: set sw=4 sts=4 et foldmethod=syntax : */
+
+/*
+ * Copyright (c) 2005, 2006 Ciaran McCreesh <ciaranm@ciaranm.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_PORTAGE_DEP_LEXER_HH
+#define PALUDIS_GUARD_PALUDIS_PORTAGE_DEP_LEXER_HH 1
+
+#include <paludis/util/exception.hh>
+#include <paludis/util/instantiation_policy.hh>
+#include <paludis/util/private_implementation_pattern.hh>
+#include <string>
+
+#include <libwrapiter/libwrapiter_forward_iterator.hh>
+
+/** \file
+ * Declarations for the PortageDepLexer class.
+ *
+ * \ingroup grpdeplexer
+ */
+
+namespace paludis
+{
+ /**
+ * A DepStringError descendent is thrown if an invalid depend string is
+ * encountered.
+ *
+ * \ingroup grpdeplexer
+ * \ingroup grpexceptions
+ */
+ class DepStringError : public Exception
+ {
+ protected:
+ /**
+ * Constructor.
+ */
+ DepStringError(const std::string & dep_string,
+ const std::string & message) throw ();
+ };
+
+ /**
+ * A DepStringLexError is thrown if a lex-level error is encountered when
+ * parsing a dependency string.
+ *
+ * \ingroup grpdeplexer
+ * \ingroup grpexceptions
+ */
+ class DepStringLexError : public DepStringError
+ {
+ public:
+ /**
+ * Constructor.
+ */
+ DepStringLexError(const std::string & dep_string,
+ const std::string & message) throw ();
+ };
+
+ /**
+ * Lexemes used by PortageDepLexer.
+ *
+ * \see PortageDepLexer
+ *
+ * \ingroup grpdeplexer
+ */
+ enum PortageDepLexerLexeme
+ {
+ dpl_whitespace, ///< whitespace
+ dpl_text, ///< a package or item name
+ dpl_use_flag, ///< a use flag
+ dpl_double_bar, ///< a double bar ('any' marker)
+ dpl_open_paren, ///< open paren
+ dpl_close_paren ///< close paren
+ };
+
+ /**
+ * Converts a dependency string into a sequence of tokens, which are
+ * then handled by DepParser.
+ *
+ * \see DepParser
+ *
+ * \ingroup grpdeplexer
+ */
+ class PortageDepLexer :
+ private InstantiationPolicy<PortageDepLexer, instantiation_method::NonCopyableTag>,
+ private PrivateImplementationPattern<PortageDepLexer>
+ {
+ public:
+ ///\name Iterate over our items
+ ///\{
+
+ typedef libwrapiter::ForwardIterator<PortageDepLexer,
+ const std::pair<PortageDepLexerLexeme, std::string> > Iterator;
+
+ Iterator begin() const;
+
+ Iterator end() const;
+
+ ///\}
+
+ ///\name Basic operations
+ ///\{
+
+ PortageDepLexer(const std::string &);
+ ~PortageDepLexer();
+
+ ///\}
+ };
+}
+
+#endif