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diff --git a/src/formats/logfmt/logfmt.parser.hh b/src/formats/logfmt/logfmt.parser.hh
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+++ b/src/formats/logfmt/logfmt.parser.hh
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+/**
+ * Copyright (c) 2021, Timothy Stack
+ *
+ * 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 Timothy Stack 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 REGENTS 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 REGENTS 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 logfmt.parser.hh
+ */
+
+#ifndef lnav_logfmt_parser_hh
+#define lnav_logfmt_parser_hh
+
+#include "base/intern_string.hh"
+#include "base/result.h"
+#include "mapbox/variant.hpp"
+
+namespace logfmt {
+
+class parser {
+public:
+    explicit parser(string_fragment sf);
+
+    struct end_of_input {};
+    struct error {
+        int e_offset;
+        const std::string e_msg;
+    };
+    struct unquoted_value {
+        string_fragment uv_value;
+    };
+    struct quoted_value {
+        string_fragment qv_value;
+    };
+    struct bool_value {
+        bool bv_value{false};
+        string_fragment bv_str_value;
+    };
+    struct int_value {
+        int64_t iv_value{0};
+        string_fragment iv_str_value;
+    };
+    struct float_value {
+        double fv_value{0};
+        string_fragment fv_str_value;
+    };
+    using value_type = mapbox::util::variant<
+        bool_value,
+        int_value,
+        float_value,
+        unquoted_value,
+        quoted_value
+    >;
+
+    using kvpair = std::pair<string_fragment, value_type>;
+
+    using step_result = mapbox::util::variant<
+        end_of_input,
+        kvpair,
+        error
+    >;
+
+    step_result step();
+private:
+    string_fragment p_next_input;
+};
+
+}
+
+#endif