Class: Mapi::RTF::Tokenizer

Inherits:
Object
  • Object
show all
Defined in:
lib/mapi/rtf.rb

Class Method Summary collapse

Class Method Details

.process(io) ⇒ Object 



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# File 'lib/mapi/rtf.rb', line 23

def self.process io
  while true do
    case c = io.getc
    when ?{; yield :open_group
    when ?}; yield :close_group
    when ?\\
      case c = io.getc
      when ?{, ?}, ?\\; yield :text, c.chr
      when ?'; yield :text, [io.read(2)].pack('H*')
      when ?a..?z, ?A..?Z
        # read control word
        str = c.chr
        str << c while c = io.read(1) and c =~ /[a-zA-Z]/
        neg = 1
        neg = -1 and c = io.read(1) if c == '-'
        num = if c =~ /[0-9]/
          num = c
          num << c while c = io.read(1) and c =~ /[0-9]/
          num.to_i * neg
        end
        raise "invalid rtf stream" if neg == -1 and !num # ???? \blahblah- some text
        io.seek(-1, IO::SEEK_CUR) if c != ' '
        yield :control_word, str, num
      when nil
        raise "invalid rtf stream" # \EOF
      else
        # other kind of control symbol
        yield :control_symbol, c.chr
      end
    when nil
      return
    when ?\r, ?\n
      # ignore
    else yield :text, c.chr
    end
  end
end