Class: Tags::HighlightBlock

Inherits:
Liquid::Block
  • Object
show all
Includes:
Liquid::StandardFilters
Defined in:
lib/blastwolf/pygments.rb

Constant Summary collapse

SYNTAX =

The regular expression syntax checker. Start with the language specifier. Follow that by zero or more space separated options that take one of two forms:

  1. name

  2. name=value

/^([a-zA-Z0-9.+#-]+)((\s+\w+(=\w+)?)*)$/

Instance Method Summary collapse

Constructor Details

#initialize(tag_name, markup, tokens) ⇒ HighlightBlock

Returns a new instance of HighlightBlock.



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# File 'lib/blastwolf/pygments.rb', line 16

def initialize(tag_name, markup, tokens)
  super
  if markup.strip =~ SYNTAX
    @lang = $1
    @options = {}
    if defined?($2) && $2 != ''
      $2.split.each do |opt|
        key, value = opt.split('=')
        if value.nil?
          if key == 'linenos'
            value = 'inline'
          else
            value = true
          end
        end
        @options[key] = value
      end
    end
  else
    raise SyntaxError.new <<-eos
Syntax Error in tag 'highlight' while parsing the following markup:

#{markup}

Valid syntax: highlight <lang> [linenos]
eos
  end
end

Instance Method Details

#add_code_tags(code, lang) ⇒ Object 



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# File 'lib/blastwolf/pygments.rb', line 77

def add_code_tags(code, lang)
  # Add nested <code> tags to code blocks
  code = code.sub(/<pre>/,'<pre><code class="' + lang + '">')
  code = code.sub(/<\/pre>/,"</code></pre>")
end

#render(context) ⇒ Object 



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# File 'lib/blastwolf/pygments.rb', line 45

def render(context)
  if true
    render_pygments(context, super)
  else
    render_codehighlighter(context, super)
  end
end

#render_codehighlighter(context, code) ⇒ Object 



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# File 'lib/blastwolf/pygments.rb', line 68

def render_codehighlighter(context, code)
  #The div is required because RDiscount blows ass
  <<-HTML
<div>
  <pre><code class='#{@lang}'>#{h(code).strip}</code></pre>
</div>
  HTML
end

#render_pygments(context, code) ⇒ Object 



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# File 'lib/blastwolf/pygments.rb', line 53

def render_pygments(context, code)
  require 'pygments'

  @options[:encoding] = 'utf-8'

  output = add_code_tags(
    Pygments.highlight(code, :lexer => @lang, :options => @options),
    @lang
  )

  output = context["pygments_prefix"] + output if context["pygments_prefix"]
  output = output + context["pygments_suffix"] if context["pygments_suffix"]
  output
end