class HTML::Pipeline::SyntaxHighlightFilter
HTML Filter that syntax highlights code blocks wrapped in <pre lang=“…”>.
Public Class Methods
new(*args)
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Calls superclass method
HTML::Pipeline::Filter.new
# File lib/html/pipeline/syntax_highlight_filter.rb, line 8 def initialize(*args) super(*args) @formatter = Rouge::Formatters::HTML.new end
Public Instance Methods
call()
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# File lib/html/pipeline/syntax_highlight_filter.rb, line 13 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, lang) next if html.nil? node.inner_html = html klass = node['class'] scope = context[:scope] || "highlight-#{lang}" klass = [klass, scope].compact.join ' ' node['class'] = klass end doc end
highlight_with_timeout_handling(text, lang)
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# File lib/html/pipeline/syntax_highlight_filter.rb, line 33 def highlight_with_timeout_handling(text, lang) Rouge.highlight(text, lang, @formatter) rescue Timeout::Error => _ nil end
lexer_for(lang)
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# File lib/html/pipeline/syntax_highlight_filter.rb, line 39 def lexer_for(lang) Rouge::Lexer.find(lang) end