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path: root/actionpack/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb
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<% names = traces.keys %>
<% error_index = local_assigns[:error_index] || 0 %>

<p><code>Rails.root: <%= defined?(Rails) && Rails.respond_to?(:root) ? Rails.root : "unset" %></code></p>

<div id="traces-<%= error_index %>">
  <% names.each do |name| %>
    <%
      show = "show('#{name.gsub(/\s/, '-')}-#{error_index}');"
      hide = (names - [name]).collect {|hide_name| "hide('#{hide_name.gsub(/\s/, '-')}-#{error_index}');"}
    %>
    <a href="#" onclick="<%= hide.join %><%= show %>; return false;"><%= name %></a> <%= '|' unless names.last == name %>
  <% end %>

  <% traces.each do |name, trace| %>
    <div id="<%= "#{name.gsub(/\s/, '-')}-#{error_index}" %>" style="display: <%= (name == trace_to_show) ? 'block' : 'none' %>;">
      <code style="font-size: 11px;">
        <% trace.each do |frame| %>
          <a class="trace-frames trace-frames-<%= error_index %>" data-exception-object-id="<%= frame[:exception_object_id] %>" data-frame-id="<%= frame[:id] %>" href="#">
            <%= frame[:trace] %>
          </a>
          <br>
        <% end %>
      </code>
    </div>
  <% end %>

  <script type="text/javascript">
    (function() {
      var traceFrames = document.getElementsByClassName('trace-frames-<%= error_index %>');
      var selectedFrame, currentSource = document.getElementById('frame-source-<%= error_index %>-0');

      // Add click listeners for all stack frames
      for (var i = 0; i < traceFrames.length; i++) {
        traceFrames[i].addEventListener('click', function(e) {
          e.preventDefault();
          var target = e.target;
          var frame_id = target.dataset.frameId;

          if (selectedFrame) {
            selectedFrame.className = selectedFrame.className.replace("selected", "");
          }

          target.className += " selected";
          selectedFrame = target;

          // Change the extracted source code
          changeSourceExtract(frame_id);
        });

        function changeSourceExtract(frame_id) {
          var el = document.getElementById('frame-source-<%= error_index %>-' + frame_id);
          if (currentSource && el) {
            currentSource.className += " hidden";
            el.className = el.className.replace(" hidden", "");
            currentSource = el;
          }
        }
      }
    })();
  </script>
</div>