class HTML::Pipeline::SyntaxHighlightFilter
HTML
Filter
that syntax highlights text inside code blocks.
Context options:
:highlight => String represents the language to pick lexer. Defaults to empty string. :scope => String represents the class attribute adds to pre element after. Defaults to "highlight highlight-css" if highlights a css code block.
This filter does not write any additional information to the context hash.
Public Class Methods
new(*args)
click to toggle source
Calls superclass method
HTML::Pipeline::Filter::new
# File lib/html/pipeline/syntax_highlight_filter.rb, line 17 def initialize(*args) super(*args) @formatter = Rouge::Formatters::HTML.new end
Public Instance Methods
call()
click to toggle source
# File lib/html/pipeline/syntax_highlight_filter.rb, line 22 def call doc.search('pre').each do |node| default = context[:highlight] && context[:highlight].to_s next unless lang = node['lang'] || default next unless lexer = lexer_for(lang) text = node.inner_text html = highlight_with_timeout_handling(text, lexer) next if html.nil? node.inner_html = html scope = context.fetch(:scope) { 'highlight' } node['class'] = "#{scope} #{scope}-#{lang}" end doc end
highlight_with_timeout_handling(text, lexer)
click to toggle source
# File lib/html/pipeline/syntax_highlight_filter.rb, line 39 def highlight_with_timeout_handling(text, lexer) Rouge.highlight(text, lexer, @formatter) rescue Timeout::Error => _ nil end
lexer_for(lang)
click to toggle source
# File lib/html/pipeline/syntax_highlight_filter.rb, line 45 def lexer_for(lang) Rouge::Lexer.find(lang) end