Class: PDoc::Generators::Html::SyntaxHighlighter

Inherits:
Object
  • Object
show all
Defined in:
lib/pdoc/generators/html/syntax_highlighter.rb

Constant Summary collapse

CODE_BLOCK_REGEXP = 
/(?:\n\n|\A)(?:\s{4,}lang(?:uage)?:\s*(\w+)\s*\n)?((?:\s{4}.*\n*)+)(^\s{0,3}\S|\z)?/

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(h = nil) ⇒ SyntaxHighlighter

Returns a new instance of SyntaxHighlighter.



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# File 'lib/pdoc/generators/html/syntax_highlighter.rb', line 9

def initialize(h = nil)
  @highlighter = h.nil? ? :none : h.to_sym
end

Instance Attribute Details

#highlighter ⇒ Object (readonly)

Returns the value of attribute highlighter.



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# File 'lib/pdoc/generators/html/syntax_highlighter.rb', line 7

def highlighter
  @highlighter
end

Instance Method Details

#highlight_block(code, language) ⇒ Object 



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# File 'lib/pdoc/generators/html/syntax_highlighter.rb', line 21

def highlight_block(code, language)
  language = :javascript if language.nil?
  case highlighter.to_sym
    when :none
      require 'cgi'
      code = CGI.escapeHTML(code)
      "<pre><code class=\"#{language}\">#{code}</code></pre>"
    when :coderay
      require 'coderay'
      CodeRay.scan(code, language).div
    when :pygments
      require 'albino'
      Albino.new(code, language).colorize
  else
    raise "Requested unsupported syntax highlighter: #{highlighter}"
  end
end

#parse(input) ⇒ Object 



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# File 'lib/pdoc/generators/html/syntax_highlighter.rb', line 13

def parse(input)
  input.gsub(CODE_BLOCK_REGEXP) do |block|
    language, codeblock, remainder = $1, $2, $3
    codeblock = codeblock.gsub(/^\s{4}/, '').rstrip
    "\n\n#{highlight_block(codeblock, language)}\n#{remainder}"
  end
end