78 lines
2.2 KiB
Ruby
78 lines
2.2 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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class Highlight
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TIMEOUT_BACKGROUND = 30.seconds
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TIMEOUT_FOREGROUND = 1.5.seconds
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MAXIMUM_TEXT_HIGHLIGHT_SIZE = 512.kilobytes
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def self.highlight(blob_name, blob_content, language: nil, plain: false)
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new(blob_name, blob_content, language: language)
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.highlight(blob_content, continue: false, plain: plain)
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end
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attr_reader :blob_name
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def initialize(blob_name, blob_content, language: nil)
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@formatter = Rouge::Formatters::HTMLGitlab
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@language = language
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@blob_name = blob_name
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@blob_content = blob_content
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end
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def highlight(text, continue: true, plain: false)
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plain ||= text.length > MAXIMUM_TEXT_HIGHLIGHT_SIZE
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highlighted_text = highlight_text(text, continue: continue, plain: plain)
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highlighted_text = link_dependencies(text, highlighted_text) if blob_name
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highlighted_text
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end
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def lexer
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@lexer ||= custom_language || begin
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Rouge::Lexer.guess(filename: @blob_name, source: @blob_content).new
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rescue Rouge::Guesser::Ambiguous => e
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e.alternatives.min_by(&:tag)
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end
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end
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private
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def custom_language
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return unless @language
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Rouge::Lexer.find_fancy(@language)
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end
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def highlight_text(text, continue: true, plain: false)
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if plain
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highlight_plain(text)
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else
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highlight_rich(text, continue: continue)
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end
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end
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def highlight_plain(text)
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@formatter.format(Rouge::Lexers::PlainText.lex(text)).html_safe
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end
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def highlight_rich(text, continue: true)
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tag = lexer.tag
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tokens = lexer.lex(text, continue: continue)
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Timeout.timeout(timeout_time) { @formatter.format(tokens, tag: tag).html_safe }
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rescue Timeout::Error => e
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Gitlab::ErrorTracking.track_and_raise_for_dev_exception(e)
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highlight_plain(text)
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rescue
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highlight_plain(text)
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end
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def timeout_time
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Gitlab::Runtime.sidekiq? ? TIMEOUT_BACKGROUND : TIMEOUT_FOREGROUND
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end
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def link_dependencies(text, highlighted_text)
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Gitlab::DependencyLinker.link(blob_name, text, highlighted_text)
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end
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end
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end
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