module Asciidoctor::SyntaxHighlighter::PygmentsAdapter::Styles

def base_style style
  library_available? ? @@base_style_cache[style || DEFAULT_STYLE] : nil
end

def read_stylesheet style
  library_available? ? @@stylesheet_cache[style || DEFAULT_STYLE] || '/* Failed to load Pygments CSS. */' : '/* Pygments CSS disabled because Pygments is not available. */'
end

def style_available? style
  (((@@available_styles ||= ::Pygments.styles.to_set).include? style) rescue nil) && style
end

def stylesheet_basename style
  %(pygments-#{style || DEFAULT_STYLE}.css)
end