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Versions: 11
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Stored size: 1.76 KB
Contents
# frozen_string_literal: true
HTMLPipeline.require_dependency("rouge", "SyntaxHighlightFilter")
class HTMLPipeline
class NodeFilter
# 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 < NodeFilter
def initialize(context: {}, result: {})
super(context: context, result: result)
# TODO: test the optionality of this
@formatter = context[:formatter] || Rouge::Formatters::HTML.new
end
SELECTOR = Selma::Selector.new(match_element: "pre", match_text_within: "pre")
def selector
SELECTOR
end
def handle_element(element)
default = context[:highlight]&.to_s
@lang = element["lang"] || default
scope = context.fetch(:scope, "highlight")
element["class"] = "#{scope} #{scope}-#{@lang}" if include_lang?
end
def handle_text_chunk(text)
return if @lang.nil?
return if (lexer = lexer_for(@lang)).nil?
content = text.to_s
text.replace(highlight_with_timeout_handling(content, lexer), as: :html)
end
def highlight_with_timeout_handling(text, lexer)
Rouge.highlight(text, lexer, @formatter)
rescue Timeout::Error => _e
text
end
def lexer_for(lang)
Rouge::Lexer.find(lang)
end
def include_lang?
!@lang.nil? && !@lang.empty?
end
end
end
end
Version data entries
11 entries across 11 versions & 1 rubygems