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# frozen_string_literal: true
module Gitlab
class Highlight
TIMEOUT_BACKGROUND = 30.seconds
TIMEOUT_FOREGROUND = 1.5.seconds
def self.highlight(blob_name, blob_content, language: nil, plain: false)
new(blob_name, blob_content, language: language)
.highlight(blob_content, continue: false, plain: plain)
end
def self.too_large?(size)
size.to_i > self.file_size_limit
end
attr_reader :blob_name
def initialize(blob_name, blob_content, language: nil)
@formatter = Rouge::Formatters::HTMLGitlab
@language = language
@blob_name = blob_name
@blob_content = blob_content
end
def highlight(text, continue: false, plain: false, context: {})
@context = context
plain ||= self.class.too_large?(text.length)
highlighted_text = highlight_text(text, continue: continue, plain: plain)
highlighted_text = link_dependencies(text, highlighted_text) if blob_name
highlighted_text
end
def lexer
@lexer ||= custom_language || begin
Rouge::Lexer.guess(filename: @blob_name, source: @blob_content).new
rescue Rouge::Guesser::Ambiguous => e
e.alternatives.min_by(&:tag)
end
end
private
attr_reader :context
def self.file_size_limit
Gitlab.config.extra['maximum_text_highlight_size_kilobytes']
end
private_class_method :file_size_limit
def custom_language
return unless @language
Rouge::Lexer.find_fancy(@language)
end
def highlight_text(text, continue: true, plain: false)
if plain
highlight_plain(text)
else
highlight_rich(text, continue: continue)
end
end
def highlight_plain(text)
@formatter.format(Rouge::Lexers::PlainText.lex(text), **context).html_safe
end
def highlight_rich(text, continue: true)
tag = lexer.tag
tokens = lexer.lex(text, continue: continue)
Timeout.timeout(timeout_time) { @formatter.format(tokens, **context, tag: tag).html_safe }
rescue Timeout::Error => e
Gitlab::ErrorTracking.track_and_raise_for_dev_exception(e)
highlight_plain(text)
rescue StandardError
highlight_plain(text)
end
def timeout_time
Gitlab::Runtime.sidekiq? ? TIMEOUT_BACKGROUND : TIMEOUT_FOREGROUND
end
def link_dependencies(text, highlighted_text)
Gitlab::DependencyLinker.link(blob_name, text, highlighted_text)
end
end
end
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