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+// Copyright 2011 The Kyua Authors.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+//   notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright
+//   notice, this list of conditions and the following disclaimer in the
+//   documentation and/or other materials provided with the distribution.
+// * Neither the name of Google Inc. nor the names of its contributors
+//   may be used to endorse or promote products derived from this software
+//   without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+/// \file engine/filters.hpp
+/// Representation and manipulation of filters for test cases.
+///
+/// All the filter classes in this module are supposed to be purely functional:
+/// they are mere filters that decide whether they match or not the input data
+/// fed to them.  User-interface filter manipulation must go somewhere else.
+
+#if !defined(ENGINE_FILTERS_HPP)
+#define ENGINE_FILTERS_HPP
+
+#include "engine/filters_fwd.hpp"
+
+#include <ostream>
+#include <string>
+#include <set>
+#include <utility>
+
+#include "utils/fs/path.hpp"
+#include "utils/optional.ipp"
+
+
+namespace engine {
+
+
+/// Filter for test cases.
+///
+/// A filter is one of: the name of a directory containing test cases, the name
+/// of a test program, or the name of a test program plus the name of a test
+/// case.
+class test_filter {
+public:
+    /// The name of the test program or subdirectory to match.
+    utils::fs::path test_program;
+
+    /// The name of the test case to match; if empty, represents any test case.
+    std::string test_case;
+
+    test_filter(const utils::fs::path&, const std::string&);
+    static test_filter parse(const std::string&);
+
+    std::string str(void) const;
+
+    bool contains(const test_filter&) const;
+    bool matches_test_program(const utils::fs::path&) const;
+    bool matches_test_case(const utils::fs::path&, const std::string&) const;
+
+    bool operator<(const test_filter&) const;
+    bool operator==(const test_filter&) const;
+    bool operator!=(const test_filter&) const;
+};
+
+
+std::ostream& operator<<(std::ostream&, const test_filter&);
+
+
+/// Collection of user-provided filters to select test cases.
+///
+/// An empty collection of filters is considered to match any test case.
+///
+/// In general, the filters maintained by this class should be disjoint.  If
+/// they are not, some filters may never have a chance to do a match, which is
+/// most likely the fault of the user.  To check for non-disjoint filters before
+/// constructing this object, use check_disjoint_filters.
+class test_filters {
+    /// The user-provided filters.
+    std::set< test_filter > _filters;
+
+public:
+    explicit test_filters(const std::set< test_filter >&);
+
+    /// Return type of match_test_case.  Indicates whether the filters have
+    /// matched a particular test case and, if they have, which filter did the
+    /// match (if any).
+    typedef std::pair< bool, utils::optional< test_filter > > match;
+
+    bool match_test_program(const utils::fs::path&) const;
+    match match_test_case(const utils::fs::path&, const std::string&) const;
+
+    std::set< test_filter > difference(const std::set< test_filter >&) const;
+};
+
+
+void check_disjoint_filters(const std::set< test_filter >&);
+
+
+/// Tracks state of the filters that have matched tests during execution.
+class filters_state {
+    /// The user-provided filters.
+    test_filters _filters;
+
+    /// Collection of filters that have matched test cases so far.
+    std::set< test_filter > _used_filters;
+
+public:
+    explicit filters_state(const std::set< test_filter >&);
+
+    bool match_test_program(const utils::fs::path&) const;
+    bool match_test_case(const utils::fs::path&, const std::string&);
+
+    std::set< test_filter > unused(void) const;
+};
+
+
+}  // namespace engine
+
+#endif  // !defined(ENGINE_FILTERS_HPP)