Class: Epos::TextParser

Inherits:
Object
  • Object
show all
Defined in:
lib/epos/text-parser.rb

Instance Method Summary collapse

Instance Method Details

#parse(text) ⇒ Object 



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# File 'lib/epos/text-parser.rb', line 20

def parse(text)
  @result   = []
  @format   = [{}]
  @fragment = ""
  @cmd      = ""

  s    = :reading_fragment
  code = ""

  text.each_char do |c|

    case s

    when :reading_fragment
      case c 
      when "\\"
        s = :escape_started
      when "{"
        self.flush
        @format << @format.last.clone
      when "}"
        self.flush
        @format.pop if @format.length > 1 # Entry "bum-bum" is broken.
      else
        @fragment << c
      end

    when :escape_started
      case c
      when "\\"
        @fragment << c
        s = :reading_fragment
      when "{"
        @fragment << c
        s = :reading_fragment
      when "'"
        code = ""
        s = :reading_code
      else
        @cmd = c
        s = :reading_command
      end

    when :reading_command
      case c
      when " "
        self.command
        s = :reading_fragment
      when "\\"
        self.command
        s = :escape_started
      when /[a-z0-9]/
        @cmd << c
      when "{"
        self.command
        self.flush
        @format << @format.last.clone
        s = :reading_fragment
      when "}"
        self.command
        self.flush
        @format.pop
        s = :reading_fragment
      else
        self.command
        @fragment << c
        s = :reading_fragment
      end

    when :reading_code
      code << c
      if code.length == 2
        @fragment << [code.to_i(16)].pack("U")
        s = :reading_fragment
      end
    end
  end

  self.command if s == :reading_command
  self.flush

  return @result

end