Class: Reloadlive::Render

Inherits:
Object
  • Object
show all
Includes:
Rack::Utils
Defined in:
lib/reloadlive/render.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(filename, data) ⇒ Render

Returns a new instance of Render.



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# File 'lib/reloadlive/render.rb', line 14

def initialize filename, data
  @filename = filename
  @data = data
  @codemap = {}
  @title = filename
end

Instance Attribute Details

#data ⇒ Object

Returns the value of attribute data.



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# File 'lib/reloadlive/render.rb', line 12

def data
  @data
end

#filename ⇒ Object

Returns the value of attribute filename.



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# File 'lib/reloadlive/render.rb', line 12

def filename
  @filename
end

#title ⇒ Object

Returns the value of attribute title.



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# File 'lib/reloadlive/render.rb', line 12

def title
  @title
end

Instance Method Details

#check_cache(type, id) ⇒ Object 



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# File 'lib/reloadlive/render.rb', line 144

def check_cache(type, id)
end

#extract_code(data) ⇒ Object 



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# File 'lib/reloadlive/render.rb', line 49

def extract_code(data)
  data.gsub!(/^([ \t]*)(~~~+) ?([^\r\n]+)?\r?\n(.+?)\r?\n\1(~~~+)[ \t\r]*$/m) do
    m_indent = $1
    m_start  = $2 # ~~~
    m_lang   = $3
    m_code   = $4
    m_end    = $5 # ~~~

    # start and finish tilde fence must be the same length
    return '' if m_start.length != m_end.length

    lang   = m_lang ? m_lang.strip : nil
    id     = Digest::SHA1.hexdigest("#{lang}.#{m_code}")
    cached = check_cache(:code, id)

    # extract lang from { .ruby } or { #stuff .ruby .indent }
    # see http://johnmacfarlane.net/pandoc/README.html#delimited-code-blocks

    if lang
        lang = lang.match(/\.([^}\s]+)/)
        lang = lang[1] unless lang.nil?
    end

    @codemap[id] = cached   ?
      { :output => cached } :
      { :lang => lang, :code => m_code, :indent => m_indent }

    "#{m_indent}#{id}" # print the SHA1 ID with the proper indentation
  end

  data.gsub!(/^([ \t]*)``` ?([^\r\n]+)?\r?\n(.+?)\r?\n\1```[ \t]*\r?$/m) do
    lang   = $2 ? $2.strip : nil
    id     = Digest::SHA1.hexdigest("#{lang}.#{$3}")
    cached = check_cache(:code, id)
    @codemap[id] = cached   ?
      { :output => cached } :
      { :lang => lang, :code => $3, :indent => $1 }
    "#{$1}#{id}" # print the SHA1 ID with the proper indentation
  end
  data
end

#extract_yaml(data) ⇒ Object 



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# File 'lib/reloadlive/render.rb', line 39

def extract_yaml(data)
  if data =~ /\A(---\s*\n.*?\n?)^(---\s*$\n?)/m
    @title = YAML.load($1)['title']
    data = $'
  end
  data
rescue => e
  puts "YAML Exception reading #{@filename}: #{e.message}"
end

#formatted_data(encoding = nil) ⇒ Object 



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# File 'lib/reloadlive/render.rb', line 21

def formatted_data encoding=nil
  data = @data.dup
  data = extract_yaml data
  data = extract_code data
  begin
    data = GitHub::Markup.render(@filename, data)
  rescue => e
    puts "Exception rendering #{@filename}: #{e.message}"
  end
  data = process_code(data, encoding)
  if data == @data
    p_lexer = Pygments::Lexer.find_by_extname(File.extname(@filename))
    lexer = p_lexer ? p_lexer.aliases.first : nil
    data = Pygments.highlight(data, :lexer => lexer, :options => {:encoding => encoding.to_s, :startinline => true})
  end
  data
end

#process_code(data, encoding = nil) ⇒ Object 



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# File 'lib/reloadlive/render.rb', line 91

def process_code(data, encoding = nil)
  return data if data.nil? || data.size.zero? || @codemap.size.zero?

  blocks    = []
  @codemap.each do |id, spec|
    next if spec[:output] # cached

    code = spec[:code]

    remove_leading_space(code, /^#{spec[:indent]}/m)
    remove_leading_space(code, /^(  |\t)/m)

    blocks << [spec[:lang], code]
  end

  highlighted = []
  blocks.each do |lang, code|
    encoding ||= 'utf-8'
    begin
      # must set startinline to true for php to be highlighted without <?
      # http://pygments.org/docs/lexers/
      hl_code = Pygments.highlight(code, :lexer => lang, :options => {:encoding => encoding.to_s, :startinline => true})
    rescue
      hl_code = code
    end
    highlighted << hl_code
  end

  @codemap.each do |id, spec|
    body = spec[:output] || begin
      if (body = highlighted.shift.to_s).size > 0
        update_cache(:code, id, body)
        body
      else
        "<pre><code>#{CGI.escapeHTML(spec[:code])}</code></pre>"
      end
    end
    data.gsub!(id) do
      body
    end
  end

  data
end

#remove_leading_space(code, regex) ⇒ Object 



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# File 'lib/reloadlive/render.rb', line 136

def remove_leading_space(code, regex)
  if code.lines.all? { |line| line =~ /\A\r?\n\Z/ || line =~ regex }
    code.gsub!(regex) do
      ''
    end
  end
end

#update_cache(type, id, data) ⇒ Object 



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# File 'lib/reloadlive/render.rb', line 147

def update_cache(type, id, data)
end