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diff --git a/src/log_data_helper.hh b/src/log_data_helper.hh
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+/**
+ * Copyright (c) 2013, 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 log_data_helper.hh
+ */
+
+#ifndef log_data_helper_hh
+#define log_data_helper_hh
+
+#include <map>
+#include <memory>
+#include <string>
+
+#include <sqlite3.h>
+
+#include "base/lnav_log.hh"
+#include "column_namer.hh"
+#include "data_parser.hh"
+#include "logfile_sub_source.hh"
+#include "sql_util.hh"
+#include "xml_util.hh"
+#include "yajlpp/json_ptr.hh"
+
+class log_data_helper {
+public:
+    explicit log_data_helper(logfile_sub_source& lss) : ldh_log_source(lss) {}
+
+    void clear();
+
+    bool parse_line(vis_line_t line, bool allow_middle = false)
+    {
+        return this->parse_line(this->ldh_log_source.at(line), allow_middle);
+    }
+
+    bool parse_line(content_line_t line, bool allow_middle = false);
+
+    int get_line_bounds(size_t& line_index_out,
+                        size_t& line_end_index_out) const;
+
+    int get_value_line(const logline_value& lv) const
+    {
+        return std::count(
+            this->ldh_line_values.lvv_sbr.get_data(),
+            this->ldh_line_values.lvv_sbr.get_data() + lv.lv_origin.lr_start,
+            '\n');
+    }
+
+    std::string format_json_getter(const intern_string_t field, int index);
+
+    logfile_sub_source& ldh_log_source;
+    content_line_t ldh_source_line;
+    std::shared_ptr<logfile> ldh_file;
+    int ldh_y_offset{0};
+    logfile::iterator ldh_line;
+    content_line_t ldh_line_index;
+    std::unique_ptr<data_scanner> ldh_scanner;
+    std::unique_ptr<data_parser> ldh_parser;
+    std::unique_ptr<column_namer> ldh_namer;
+    string_attrs_t ldh_line_attrs;
+    logline_value_vector ldh_line_values;
+    std::map<const intern_string_t, json_ptr_walk::walk_list_t> ldh_json_pairs;
+    std::map<std::pair<const intern_string_t, std::string>, std::string>
+        ldh_xml_pairs;
+    std::string ldh_msg_format;
+};
+
+#endif