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diff --git a/engine/tap_parser.hpp b/engine/tap_parser.hpp
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+// Copyright 2015 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/tap_parser.hpp
+/// Utilities to parse TAP test program output.
+
+#if !defined(ENGINE_TAP_PARSER_HPP)
+#define ENGINE_TAP_PARSER_HPP
+
+#include "engine/tap_parser_fwd.hpp"
+
+#include <cstddef>
+#include <ostream>
+#include <string>
+
+#include "utils/fs/path_fwd.hpp"
+
+namespace engine {
+
+
+/// TAP plan representing all tests being skipped.
+extern const engine::tap_plan all_skipped_plan;
+
+
+/// TAP output representation and parser.
+class tap_summary {
+    /// Whether the test program bailed out early or not.
+    bool _bailed_out;
+
+    /// The TAP plan.  Only valid if not bailed out.
+    tap_plan _plan;
+
+    /// If not empty, the reason why all tests were skipped.
+    std::string _all_skipped_reason;
+
+    /// Total number of 'ok' tests.  Only valid if not balied out.
+    std::size_t _ok_count;
+
+    /// Total number of 'not ok' tests.  Only valid if not balied out.
+    std::size_t _not_ok_count;
+
+    tap_summary(const bool, const tap_plan&, const std::string&,
+                const std::size_t, const std::size_t);
+
+public:
+    // Yes, these three constructors indicate that we really ought to have three
+    // different classes and select between them at runtime.  But doing so would
+    // be overly complex for our really simple needs here.
+    static tap_summary new_bailed_out(void);
+    static tap_summary new_all_skipped(const std::string&);
+    static tap_summary new_results(const tap_plan&, const std::size_t,
+                                   const std::size_t);
+
+    bool bailed_out(void) const;
+    const tap_plan& plan(void) const;
+    const std::string& all_skipped_reason(void) const;
+    std::size_t ok_count(void) const;
+    std::size_t not_ok_count(void) const;
+
+    bool operator==(const tap_summary&) const;
+    bool operator!=(const tap_summary&) const;
+};
+
+
+std::ostream& operator<<(std::ostream&, const tap_summary&);
+
+
+tap_summary parse_tap_output(const utils::fs::path&);
+
+
+}  // namespace engine
+
+
+#endif  // !defined(ENGINE_TAP_PARSER_HPP)