1 files changed, 114 insertions, 0 deletions
diff --git a/src/column_namer.cc b/src/column_namer.cc
new file mode 100644
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+++ b/src/column_namer.cc
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+/**
+ * Copyright (c) 2019, 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 column_namer.cc
+ */
+
+#include <algorithm>
+
+#include "column_namer.hh"
+
+#include "base/itertools.hh"
+#include "base/lnav_log.hh"
+#include "config.h"
+#include "sql_util.hh"
+
+const char column_namer::BUILTIN_COL[] = "col";
+
+column_namer::column_namer(language lang) : cn_language(lang) {}
+
+bool
+column_namer::existing_name(const string_fragment& in_name) const
+{
+    switch (this->cn_language) {
+        case language::SQL: {
+            auto upped = toupper(in_name.to_string());
+
+            if (std::binary_search(
+                    std::begin(sql_keywords), std::end(sql_keywords), upped)) {
+                return true;
+            }
+            break;
+        }
+        case language::JSON:
+            break;
+    }
+
+    if (this->cn_builtin_names | lnav::itertools::find(in_name)) {
+        return true;
+    }
+
+    if (this->cn_names | lnav::itertools::find(in_name)) {
+        return true;
+    }
+
+    return false;
+}
+
+string_fragment
+column_namer::add_column(const string_fragment& in_name)
+{
+    string_fragment base_name;
+    string_fragment retval;
+    fmt::memory_buffer buf;
+    int num = 0;
+
+    if (in_name.empty()) {
+        base_name = string_fragment::from_const(BUILTIN_COL);
+    } else {
+        base_name = in_name;
+    }
+
+    retval = base_name;
+    auto counter_iter = this->cn_name_counters.find(retval);
+    if (counter_iter != this->cn_name_counters.end()) {
+        num = ++counter_iter->second;
+        fmt::format_to(
+            std::back_inserter(buf), FMT_STRING("{}_{}"), base_name, num);
+        retval = string_fragment::from_memory_buffer(buf);
+    }
+
+    while (this->existing_name(retval)) {
+        if (num == 0) {
+            auto counter_name = retval.to_owned(this->cn_alloc);
+            this->cn_name_counters[counter_name] = num;
+        }
+
+        log_debug(
+            "column name already exists: %.*s", retval.length(), retval.data());
+        fmt::format_to(
+            std::back_inserter(buf), FMT_STRING("{}_{}"), base_name, num);
+        retval = string_fragment::from_memory_buffer(buf);
+        num += 1;
+    }
+
+    retval = retval.to_owned(this->cn_alloc);
+    this->cn_names.emplace_back(retval);
+
+    return retval;
+}