Class: Gollum::Filter::Code

Inherits:
Gollum::Filter show all
Defined in:
lib/gollum-lib/filter/code.rb

Overview

Code

Render a block of code using the Rouge syntax-highlighter.

Instance Method Summary collapse

Methods inherited from Gollum::Filter

#initialize

Methods included from Helpers

#trim_leading_slash

Constructor Details

This class inherits a constructor from Gollum::Filter

Instance Method Details

#extract(data) ⇒ Object 



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# File 'lib/gollum-lib/filter/code.rb', line 7

def extract(data)
  return data if @markup.format == :txt
  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
    next '' if m_start.length != m_end.length

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

    @map[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 = @markup.check_cache(:code, id)
    @map[id] = cached   ?
      { :output => cached } :
      { :lang => lang, :code => $3, :indent => $1 }
    "#{$1}#{id}" # print the SHA1 ID with the proper indentation
  end

  data
end

#process(data) ⇒ Object

Process all code from the codemap and replace the placeholders with the final HTML.

data - The String data (with placeholders). encoding - Encoding Constant or String.

Returns the marked up String data.



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# File 'lib/gollum-lib/filter/code.rb', line 58

def process(data)
  return data if data.nil? || data.size.zero? || @map.size.zero?

  blocks = []

  @map.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 = @markup.encoding || 'utf-8'
    begin
      if Rouge::Lexer.find(lang).nil?
        lexer = Rouge::Lexers::PlainText.new
        formatter = Rouge::Formatters::HTML.new(:wrap => false)
        hl_code = formatter.format(lexer.lex(code))
        hl_code = "<pre class='highlight'><span class='err'>#{CGI.escapeHTML(hl_code)}</span></pre>"
      else
        hl_code = Rouge.highlight(code, lang, 'html')  
      end
    rescue
      hl_code = code
    end
    highlighted << hl_code
  end

  @map.each do |id, spec|
    body = spec[:output] || begin
      if (body = highlighted.shift.to_s).size > 0
        @markup.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