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+// Copyright 2014 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/scanner.hpp
+/// Utilities to scan through list of tests in a test suite.
+
+#if !defined(ENGINE_SCANNER_HPP)
+#define ENGINE_SCANNER_HPP
+
+#include "engine/scanner_fwd.hpp"
+
+#include <memory>
+#include <set>
+
+#include "engine/filters_fwd.hpp"
+#include "model/test_program_fwd.hpp"
+#include "utils/optional_fwd.hpp"
+
+namespace engine {
+
+
+/// Scans a list of test programs, yielding one test case at a time.
+///
+/// This class contains the state necessary to process a collection of test
+/// programs (possibly as provided by the Kyuafile) and to extract an arbitrary
+/// (test program, test_case) pair out of them one at a time.
+///
+/// The scanning algorithm guarantees that test programs are initialized
+/// dynamically, should they need to load their list of test cases from disk.
+///
+/// The order of the extraction is not guaranteed.
+class scanner {
+ struct impl;
+ /// Pointer to the internal implementation data.
+ std::shared_ptr< impl > _pimpl;
+
+public:
+ scanner(const model::test_programs_vector&, const std::set< test_filter >&);
+ ~scanner(void);
+
+ bool done(void);
+ utils::optional< scan_result > yield(void);
+
+ std::set< test_filter > unused_filters(void) const;
+};
+
+
+} // namespace engine
+
+
+#endif // !defined(ENGINE_SCANNER_HPP)