Class: HighlightBlock

Inherits:
Liquid::Block
  • Object
show all
Includes:
Liquid::StandardFilters
Defined in:
lib/scribo/liquid/tags/highlight_tag.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 three forms: name, name=value, or name=“<quoted list>”

<quoted list> is a space-separated list of numbers

/^([a-zA-Z0-9.+#_-]+)((\s+\w+(=(\w+|"([0-9]+\s)*[0-9]+"))?)*)$/.freeze
LEADING_OR_TRAILING_LINE_TERMINATORS = 
/\A(\n|\r)+|(\n|\r)+\z/.freeze

Instance Method Summary collapse

Constructor Details

#initialize(tag_name, markup, tokens) ⇒ HighlightBlock

Returns a new instance of HighlightBlock.



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# File 'lib/scribo/liquid/tags/highlight_tag.rb', line 13

def initialize(tag_name, markup, tokens)
  super
  if markup.strip =~ SYNTAX
    @lang = Regexp.last_match(1).downcase
    @highlight_options = parse_options(Regexp.last_match(2))
  else
    raise SyntaxError, <<~MSG
      Syntax Error in tag 'highlight' while parsing the following markup:

      #{markup}

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

Instance Method Details

#render(context) ⇒ Object 



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# File 'lib/scribo/liquid/tags/highlight_tag.rb', line 31

def render(context)
  prefix = context['highlighter_prefix'] || ''
  suffix = context['highlighter_suffix'] || ''
  code = super.to_s.gsub(LEADING_OR_TRAILING_LINE_TERMINATORS, '')

  output =
    case context.registers[:site]&.highlighter
    when 'rouge'
      render_rouge(code)
    when 'pygments'
      render_pygments(code, context)
    else
      render_codehighlighter(code)
    end

  rendered_output = add_code_tag(output)
  prefix + rendered_output + suffix
end