Class: Scriptorium::SyntaxHighlighter

Inherits:
Object
  • Object
show all
Defined in:
lib/scriptorium/syntax_highlighter.rb

Constant Summary collapse

DEFAULT_THEME =

Default theme - can be customized

{
  'keyword' => 'color: #07a; font-weight: bold;',
  'string' => 'color: #690;',
  'comment' => 'color: #708090; font-style: italic;',
  'function' => 'color: #dd4a68;',
  'number' => 'color: #905;',
  'symbol' => 'color: #905;',
  'operator' => 'color: #9a6e3a;',
  'class-name' => 'color: #dd4a68;',
  'regex' => 'color: #e90;',
  'variable' => 'color: #e90;',
  'interpolation' => 'color: #690;',  # same as string
  'error' => 'color: #d73a49; font-weight: bold;',
  'whitespace' => 'color: transparent;',
  'other' => 'color: #24292e;'
}

Instance Method Summary collapse

Constructor Details

#initialize(theme = nil) ⇒ SyntaxHighlighter

Returns a new instance of SyntaxHighlighter.



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# File 'lib/scriptorium/syntax_highlighter.rb', line 23

def initialize(theme = nil)
  @theme = theme || DEFAULT_THEME
  @formatter = Rouge::Formatters::HTML.new
end

Instance Method Details

#generate_css ⇒ Object

Generate CSS for the theme



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# File 'lib/scriptorium/syntax_highlighter.rb', line 59

def generate_css
  css = []
  css << "/* Syntax highlighting styles */"
  css << "pre {"
  css << "  background: #f5f5f5;"
  css << "  padding: 15px;"
  css << "  border-radius: 5px;"
  css << "  overflow-x: auto;"
  css << "}"
  css << ""
  css << "pre code {"
  css << "  font-family: 'Consolas', 'Monaco', 'Andale Mono', monospace;"
  css << "  font-size: 14px;"
  css << "}"
  css << ""
  css << "/* Override Bootstrap height constraints for syntax highlighting */"
  css << "pre code[class*=\"language-\"] {"
  css << "  height: auto !important;"
  css << "  max-height: none !important;"
  css << "  min-height: auto !important;"
  css << "  overflow: visible !important;"
  css << "}"
  css << ""
  css << "pre:has(code[class*=\"language-\"]) {"
  css << "  height: auto !important;"
  css << "  max-height: none !important;"
  css << "  min-height: auto !important;"
  css << "  overflow: visible !important;"
  css << "}"
  
  @theme.each do |token, style|
    css << ".token.#{token} { #{style} }"
  end
  
  css.join("\n")
end

#highlight(code, language = nil) ⇒ Object

Highlight code with language detection



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# File 'lib/scriptorium/syntax_highlighter.rb', line 29

def highlight(code, language = nil)
  return escape_html(code) if language.nil? || language.empty?
  
  language = language.downcase.strip
  
  # Map common language names to Rouge lexers
  lexer_name = map_language(language)
  return escape_html(code) unless lexer_name
  
  begin
    lexer = Rouge::Lexer.find(lexer_name)
    puts "DEBUG: Found lexer: #{lexer.class}"
    highlighted = @formatter.format(lexer.lex(code))
    puts "DEBUG: Rouge output length: #{highlighted.length}"
    puts "DEBUG: Raw Rouge output (first 500 chars): #{highlighted[0..500]}"
    puts "DEBUG: HTML contains <div>: #{highlighted.include?('<div')}"
    puts "DEBUG: HTML contains <br>: #{highlighted.include?('<br')}"
    puts "DEBUG: HTML contains \\n: #{highlighted.include?("\n")}"
    
    # Massage the output to use our CSS classes
    massage_output(highlighted, language)
  rescue => e
    # Fallback to escaped HTML if highlighting fails
    puts "DEBUG: Rouge highlighting failed for #{language}: #{e.message}"
    puts "DEBUG: Backtrace: #{e.backtrace.first(3).join(', ')}"
    escape_html(code)
  end
end