Sha256: 27e914ddf7e5f3c6470795eee0c12ab52800f07705867258ca223c6adb13eaab
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Size: 1.47 KB
Versions: 8
Compression:
Stored size: 1.47 KB
Contents
# frozen_string_literal: true
HTML::Pipeline.require_dependency('rouge', 'SyntaxHighlightFilter')
module HTML
class Pipeline
# 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.
class SyntaxHighlightFilter < Filter
def initialize(*args)
super(*args)
@formatter = Rouge::Formatters::HTML.new
end
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
def highlight_with_timeout_handling(text, lexer)
Rouge.highlight(text, lexer, @formatter)
rescue Timeout::Error => _
nil
end
def lexer_for(lang)
Rouge::Lexer.find(lang)
end
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems