Class: Rackr::Router::Errors::DevHtml

Inherits:
Object
  • Object
show all
Includes:
Action
Defined in:
lib/rackr/router/errors/dev_html.rb

Constant Summary

Constants included from Action

Action::RENDER

Instance Method Summary collapse

Methods included from Action

included

Instance Method Details

#backtrace(env) ⇒ Object 



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# File 'lib/rackr/router/errors/dev_html.rb', line 51

def backtrace(env)
  first, *tail = env['error'].backtrace
  traceback = String.new("<h2>Traceback <span>(innermost first)</span></h2>")
  traceback << "<p class=\"first-p\">#{first}</p><br/>"

  line_number = extract_line_number(first)
  match = first.match(%r{^(/[[\w/.-]]+)})
  file_path = (match ? match[1] : nil)
  unless file_path.nil?
    lines = File.readlines(file_path).map.with_index { |line, i| "#{i + 1}: #{line}" }
    traceback << "<pre>#{slice_around_index(lines, line_number).join('')}</pre>"
  end

  traceback << "<p>#{tail.join("<br>")}</p>"
  traceback
end

#call(env) ⇒ Object 



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# File 'lib/rackr/router/errors/dev_html.rb', line 9

def call(env)
  render(html: <<-HTML
    <!DOCTYPE html>
    <html>
    <head>
      <title>Application error</title>
      <style>
        html * { padding:0; margin:0; }
        body * { padding:10px 20px; }
        body * * { padding:0; }
        body { font:small sans-serif; }
        body>div { border-bottom:1px solid #ddd; }
        h1 { font-weight:normal; }
        h2 { margin-bottom:.8em; }
        h2 span { font-size:80%; color:#666; font-weight:normal; }
        #summary { background: #ffc; }
        #summary h2 { font-weight: normal; color: #666; }
        #backtrace { background: #eee; }
        pre {
          background: #ddd;
          padding: 1em;
          margin-bottom: 1em;
        }
        p {
          font-family: monospace;
        }
      </style>
    </head>
    <body>
      <div id="summary">
        <h1>#{env['error'].class}</h1>
        <h2>#{env['error'].message.size > 1000 ? "#{env['error'].message.slice(0, 1000)} ..." : env['error'].message}</h2>
      </div>
      <div id="backtrace">
        #{backtrace(env)}
      </div>
    </body>
    </html>
  HTML
        )
end

#extract_line_number(input) ⇒ Object 



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# File 'lib/rackr/router/errors/dev_html.rb', line 68

def extract_line_number(input)
  if (match = input.match(/:(\d+):in/))
    match[1].to_i
  end
end

#slice_around_index(array, index) ⇒ Object 



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# File 'lib/rackr/router/errors/dev_html.rb', line 74

def slice_around_index(array, index)
  return array if index.nil? || index < 1

  index -= 1
  start_index = [index - 2, 0].max
  end_index = [index + 2, array.size - 1].min

  array[start_index..end_index]
end