Class: CodeRay::Scanners::Diff

Inherits:
Scanner
  • Object
show all
Defined in:
lib/coderay/scanners/diff.rb

Constant Summary

Constants inherited from Scanner

Scanner::DEFAULT_OPTIONS, Scanner::ScanError

Instance Method Summary collapse

Methods inherited from Scanner

#column, #each, file_extension, #initialize, #line, normify, #reset, streamable?, #streaming?, #string=, #tokenize, #tokens

Methods included from Plugin

#helper, #included, #plugin_host, #plugin_id, #register_for, #title

Constructor Details

This class inherits a constructor from CodeRay::Scanners::Scanner

Instance Method Details

#scan_tokens(tokens, options) ⇒ Object 



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# File 'lib/coderay/scanners/diff.rb', line 9

def scan_tokens tokens, options
  
  line_kind = nil
  state = :initial
  
  until eos?
    kind = match = nil
    
    if match = scan(/\n/)
      if line_kind
        tokens << [:end_line, line_kind]
        line_kind = nil
      end
      tokens << [match, :space]
      next
    end
    
    case state
    
    when :initial
      if match = scan(/--- |\+\+\+ |=+|_+/)
        tokens << [:begin_line, line_kind = :head]
        tokens << [match, :head]
        next unless match = scan(/.+/)
        kind = :plain
      elsif match = scan(/Index: |Property changes on: /)
        tokens << [:begin_line, line_kind = :head]
        tokens << [match, :head]
        next unless match = scan(/.+/)
        kind = :plain
      elsif match = scan(/Added: /)
        tokens << [:begin_line, line_kind = :head]
        tokens << [match, :head]
        next unless match = scan(/.+/)
        kind = :plain
        state = :added
      elsif match = scan(/\\ /)
        tokens << [:begin_line, line_kind = :change]
        tokens << [match, :change]
        next unless match = scan(/.+/)
        kind = :plain
      elsif scan(/(@@)((?>[^@\n]*))(@@)/)
        tokens << [:begin_line, line_kind = :change]
        tokens << [self[1], :change]
        tokens << [self[2], :plain]
        tokens << [self[3], :change]
        next unless match = scan(/.+/)
        kind = :plain
      elsif match = scan(/\+/)
        tokens << [:begin_line, line_kind = :insert]
        tokens << [match, :insert]
        next unless match = scan(/.+/)
        kind = :plain
      elsif match = scan(/-/)
        tokens << [:begin_line, line_kind = :delete]
        tokens << [match, :delete]
        next unless match = scan(/.+/)
        kind = :plain
      elsif scan(/ .*/)
        kind = :comment
      elsif scan(/.+/)
        tokens << [:begin_line, line_kind = :head]
        kind = :plain
      else
        raise_inspect 'else case rached'
      end
    
    when :added
      if match = scan(/   \+/)
        tokens << [:begin_line, line_kind = :insert]
        tokens << [match, :insert]
        next unless match = scan(/.+/)
        kind = :plain
      else
        state = :initial
        next
      end
    end
    
    match ||= matched
    if $DEBUG and not kind
      raise_inspect 'Error token %p in line %d' %
        [[match, kind], line], tokens
    end
    raise_inspect 'Empty token', tokens unless match
    
    tokens << [match, kind]
  end
  
  tokens << [:end_line, line_kind] if line_kind
  tokens
end