Class: Flamegraph::Renderer

Inherits:
Object
  • Object
show all
Defined in:
lib/flamegraph/renderer.rb

Instance Method Summary collapse

Constructor Details

#initialize(stacks) ⇒ Renderer

Returns a new instance of Renderer.



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# File 'lib/flamegraph/renderer.rb', line 5

def initialize(stacks)
  @stacks = stacks
end

Instance Method Details

#graph_data ⇒ Object 



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# File 'lib/flamegraph/renderer.rb', line 24

def graph_data
  table = []
  prev = []

  # a 2d array makes collapsing easy
  @stacks.each_with_index do |stack, pos|

    next unless stack

    col = []

    stack.reverse.map{|r| r.to_s}.each_with_index do |frame, i|

      if !prev[i].nil?
        last_col = prev[i]
        if last_col[0] == frame
          last_col[1] += 1
          col << nil
          next
        end
      end

      prev[i] = [frame, 1]
      col << prev[i]
    end
    prev = prev[0..col.length-1].to_a
    table << col
  end

  data = []

  # a 1d array makes rendering easy
  table.each_with_index do |col, col_num|
    col.each_with_index do |row, row_num|
      next unless row && row.length == 2
      data << {
        :x => col_num + 1,
        :y => row_num + 1,
        :width => row[1],
        :frame => row[0]
      }
    end
  end

  data
end

#graph_html(embed_resources) ⇒ Object 



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# File 'lib/flamegraph/renderer.rb', line 9

def graph_html(embed_resources)
  body = read('flamegraph.html')
  body.sub! "/**INCLUDES**/",
    if embed_resources
      embed("jquery.min.js","d3.min.js","lodash.min.js")
    else
      '<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.17/d3.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/1.3.1/lodash.min.js"></script>'
    end

  body.sub!("/**DATA**/", ::JSON.generate(graph_data));
  body
end