module Jekyll module Tags class ExampleBlock < Liquid::Block include Liquid::StandardFilters # 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="" # # is a space-separated list of numbers SYNTAX = /^([a-zA-Z0-9.+#-]+)((\s+\w+(=((\w|[0-9_-])+|"([0-9]+\s)*[0-9]+"))?)*)$/ def initialize(tag_name, markup, tokens) super if markup.strip =~ SYNTAX @lang = $1.downcase @options = {} if defined?($2) && $2 != '' # Split along 3 possible forms -- key="", key=value, or key $2.scan(/(?:\w+(?:=(?:(?:\w|[0-9_-])+|"[^"]*")?)?)/) do |opt| key, value = opt.split('=') # If a quoted list, convert to array if value && value.include?("\"") value.gsub!(/"/, "") value = value.split end @options[key.to_sym] = value || true end end @options[:linenos] = false else raise SyntaxError.new <<-eos Syntax Error in tag 'example' while parsing the following markup: #{markup} Valid syntax: example eos end end def render(context) prefix = context["highlighter_prefix"] || "" suffix = context["highlighter_suffix"] || "" code = super.to_s.strip output = case context.registers[:site].highlighter when 'rouge' render_rouge(code) end rendered_output = example(code) + add_code_tag(output) prefix + rendered_output + suffix end def example(output) "
\n#{output}\n
" end def remove_holderjs(code) code = code.gsub(/data-src="holder.js.+?"/, 'src="..."') end def remove_example_classes(code) # Find `bd-` classes and remove them from the highlighted code. Because of how this regex works, it will also # remove classes that are after the `bd-` class. While this is a bug, I left it because it can be helpful too. # To fix the bug, replace `(?=")` with `(?=("|\ ))`. code = code.gsub(/(?!class=".)\ *?bd-.+?(?=")/, "") # Find empty class attributes after the previous regex and remove those too. code = code.gsub(/\ class=""/, "") end def render_rouge(code) require 'rouge' formatter = Rouge::Formatters::HTML.new(line_numbers: @options[:linenos], wrap: false) lexer = Rouge::Lexer.find_fancy(@lang, code) || Rouge::Lexers::PlainText code = remove_holderjs(code) code = remove_example_classes(code) code = formatter.format(lexer.lex(code)) "
#{code}
" end def add_code_tag(code) # Add nested tags to code blocks code = code.sub(/
\n*/,'
')
        code = code.sub(/\n*<\/pre>/,"
") code.strip end end end end Liquid::Template.register_tag('example', Jekyll::Tags::ExampleBlock)