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module Jekyll
module Tags
class HighlightBlock < 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]+\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=\w|\w)+/) 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] = "inline" if @options.key?(:linenos) and @options[:linenos] == true
else
raise SyntaxError.new <<-eos
Syntax Error in tag 'highlight' while parsing the following markup:
#{markup}
Valid syntax: highlight <lang> [linenos]
eos
end
end
def render(context)
prefix = context["highlighter_prefix"] || ""
suffix = context["highlighter_suffix"] || ""
code = super.to_s.gsub(/\A(\n|\r)+|(\n|\r)+\z/, '')
is_safe = !!context.registers[:site].safe
output =
case context.registers[:site].highlighter
when 'pygments'
render_pygments(code, is_safe)
when 'rouge'
render_rouge(code)
else
render_codehighlighter(code)
end
rendered_output = add_code_tag(output)
prefix + rendered_output + suffix
end
def sanitized_opts(opts, is_safe)
if is_safe
Hash[[
[:startinline, opts.fetch(:startinline, nil)],
[:hl_linenos, opts.fetch(:hl_linenos, nil)],
[:linenos, opts.fetch(:linenos, nil)],
[:encoding, opts.fetch(:encoding, 'utf-8')],
[:cssclass, opts.fetch(:cssclass, nil)]
].reject {|f| f.last.nil? }]
else
opts
end
end
def render_pygments(code, is_safe)
Jekyll::External.require_with_graceful_fail('pygments')
highlighted_code = Pygments.highlight(
code,
:lexer => @lang,
:options => sanitized_opts(@options, is_safe)
)
if highlighted_code.nil?
Jekyll.logger.error "There was an error highlighting your code:"
puts
Jekyll.logger.error code
puts
Jekyll.logger.error "While attempting to convert the above code, Pygments.rb" +
" returned an unacceptable value."
Jekyll.logger.error "This is usually a timeout problem solved by running `jekyll build` again."
raise ArgumentError.new("Pygments.rb returned an unacceptable value when attempting to highlight some code.")
end
highlighted_code.sub('<div class="highlight"><pre>', '').sub('</pre></div>', '')
end
def render_rouge(code)
Jekyll::External.require_with_graceful_fail('rouge')
formatter = Rouge::Formatters::HTML.new(line_numbers: @options[:linenos], wrap: false)
lexer = Rouge::Lexer.find_fancy(@lang, code) || Rouge::Lexers::PlainText
formatter.format(lexer.lex(code))
end
def render_codehighlighter(code)
h(code).strip
end
def add_code_tag(code)
code_attributes = [
"class=\"language-#{@lang.to_s.gsub('+', '-')}\"",
"data-lang=\"#{@lang.to_s}\""
].join(" ")
"<figure class=\"highlight\"><pre><code #{code_attributes}>#{code.chomp}</code></pre></figure>"
end
end
end
end
Liquid::Template.register_tag('highlight', Jekyll::Tags::HighlightBlock)
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