require 'htmlbeautifier'
module Jekyll
module Tags
class ExampleBlock < Liquid::Block
include Liquid::StandardFilters
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 == ""
markup = 'html'
end
if markup.strip =~ SYNTAX
@lang = $1.downcase
@options = {}
if defined?($2) && $2 != ''
# Split along 3 possible forms -- key="", key=value, or key
$2.scan(/(?:\w+(?:=(?:(?:\w|[0-9_-])+|"[^"]*")?)?)/) do |opt|
key, value = opt.split('=')
# If a quoted list, convert to array
if value && value.include?("\"")
value.gsub!(/"/, "")
value = value.split
end
@options[key.to_sym] = value || true
end
end
@options[:linenos] = false
else
raise SyntaxError.new <<-eos
Syntax Error in tag 'example' while parsing the following markup:
#{markup}
Valid syntax: example [id=foo]
eos
end
end
def render(context)
prefix = context["highlighter_prefix"] || ""
suffix = context["highlighter_suffix"] || ""
code = super.to_s.strip
output = case context.registers[:site].highlighter
when 'rouge'
render_rouge(code)
end
# output = HtmlBeautifier.beautify(output, indent: "\t")
rendered_output = example(code) + add_code_tag(output)
prefix + rendered_output + suffix
end
def example(output)
output = output.gsub(//, "").gsub(/<\/hide>/, "")
"
"
end
def remove_example_classes(code)
# Find `bd-` classes and remove them from the highlighted code. Because of how this regex works, it will also
# remove classes that are after the `bd-` class. While this is a bug, I left it because it can be helpful too.
# To fix the bug, replace `(?=")` with `(?=("|\ ))`.
code = code.gsub(/(?!class=".)\ *?bd-.+?(?=")/, "")
# Find empty class attributes after the previous regex and remove those too.
code = code.gsub(/\ class=""/, "")
end
def render_rouge(code)
require 'rouge'
formatter = Rouge::Formatters::HTML.new(line_numbers: @options[:linenos], wrap: false)
lexer = Rouge::Lexer.find_fancy(@lang, code) || Rouge::Lexers::PlainText
code = remove_example_classes(code)
code = code.gsub(/.*?<\/hide>/, "")
code = formatter.format(lexer.lex(code))
code = code.strip.gsub /^[\t\s]*$\n/, ''
code = code.gsub /\t/, "\s\s"
code = code.gsub "javascript:void(0)", "#"
code = code.gsub "../", "./"
"
#{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)