Class: SgfTokenizer

Inherits:
Racc::Parser
  • Object
show all
Defined in:
lib/sgf_tools/tokenizer.rb

Defined Under Namespace

Classes: ScanError

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#filename ⇒ Object (readonly)

Returns the value of attribute filename.



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# File 'lib/sgf_tools/tokenizer.rb', line 22

def filename
  @filename
end

#lineno ⇒ Object (readonly)

Returns the value of attribute lineno.



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# File 'lib/sgf_tools/tokenizer.rb', line 21

def lineno
  @lineno
end

Instance Method Details

#action(&block) ⇒ Object 



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# File 'lib/sgf_tools/tokenizer.rb', line 26

def action &block
  yield
end

#load_file(filename) ⇒ Object 



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# File 'lib/sgf_tools/tokenizer.rb', line 35

def load_file( filename )
  @filename = filename
  open(filename, "r") do |f|
    scan_evaluate  f.read
  end
end

#next_token ⇒ Object 



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# File 'lib/sgf_tools/tokenizer.rb', line 47

def next_token
  @rex_tokens.shift
end

#scan_evaluate(str) ⇒ Object 



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# File 'lib/sgf_tools/tokenizer.rb', line 51

def scan_evaluate( str )
  scan_setup
  @rex_tokens = []
  @lineno  =  1
  ss = StringScanner.new(str)
  state = nil
  until ss.eos?
    text = ss.peek(1)
    @lineno  +=  1  if text == "\n"
    case state
    when nil
      case
      when (text = ss.scan(/[A-Z]+/))
         @rex_tokens.push action { [:prop_ident, text] }

      when (text = ss.scan(/\[[^\]]*\]/))
         @rex_tokens.push action { [:prop_value, text[1..-2]] }

      when (text = ss.scan(/\s+/))
        ;

      when (text = ss.scan(/./))
         @rex_tokens.push action { [text, text] }

      else
        text = ss.string[ss.pos .. -1]
        raise  ScanError, "can not match: '" + text + "'"
      end  # if

    else
      raise  ScanError, "undefined state: '" + state.to_s + "'"
    end  # case state
  end  # until ss
end

#scan_file(filename) ⇒ Object 



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# File 'lib/sgf_tools/tokenizer.rb', line 42

def scan_file( filename )
  load_file  filename
  do_parse
end

#scan_setup ⇒ Object 



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# File 'lib/sgf_tools/tokenizer.rb', line 24

def scan_setup ; end

#scan_str(str) ⇒ Object 



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# File 'lib/sgf_tools/tokenizer.rb', line 30

def scan_str( str )
  scan_evaluate  str
  do_parse
end