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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="<quoted list>"
#
# <quoted list> 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="<quoted list>", 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 <lang> [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
rendered_output = example(code) + add_code_tag(output)
prefix + rendered_output + suffix
end
def example(output)
"<div class=\"bd-example\"" + (@options[:id] ? " data-example-id=\"#{@options[:id]}\"" : "") + ">\n#{output}\n</div>"
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))
"<div class=\"highlight\"><pre>#{code}</pre></div>"
end
def add_code_tag(code)
# Add nested <code> tags to code blocks
code = code.sub(/<pre>\n*/,'<pre><code class="language-' + @lang.to_s.gsub("+", "-") + '" data-lang="' + @lang.to_s + '">')
code = code.sub(/\n*<\/pre>/,"</code></pre>")
code.strip
end
end
end
end
Liquid::Template.register_tag('example', Jekyll::Tags::ExampleBlock)
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