Class: CraftBook::NBT::Tokenizer

Inherits:
Racc::Parser
  • Object
show all
Defined in:
lib/craftbook/nbt/snbt/lexer.rb

Defined Under Namespace

Classes: ScanError, Token

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#filename ⇒ Object (readonly) 



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# File 'lib/craftbook/nbt/snbt/lexer.rb', line 16

def filename
  @filename
end

#lineno ⇒ Object (readonly) 



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# File 'lib/craftbook/nbt/snbt/lexer.rb', line 15

def lineno
  @lineno
end

#state ⇒ Object 



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# File 'lib/craftbook/nbt/snbt/lexer.rb', line 17

def state
  @state
end

Instance Method Details

#_next_token ⇒ Object 



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# File 'lib/craftbook/nbt/snbt/lexer.rb', line 56

def _next_token
  text = @ss.peek(1)
  @lineno  +=  1  if text == "\n"
  token = case @state
    when nil
  case
          when (text = @ss.scan(/\{[\s]*/))
             action { [:COMPOUND_BEGIN] }

          when (text = @ss.scan(/[\s]*\}/))
             action { [:COMPOUND_END] }

          when (text = @ss.scan(/".+?"(?=:)/))
             action { [:IDENTIFIER, text.gsub!(/\A"|"\Z/, '') ] }

          when (text = @ss.scan(/'.+?'(?=:)/))
             action { [:IDENTIFIER, text.gsub!(/\A'|'\Z/, '') ] }

          when (text = @ss.scan(/[A-Za-z0-9_-]+?(?=:)/))
             action { [:IDENTIFIER, text] }

          when (text = @ss.scan(/".*?"/))
             action { [:STRING, text.gsub!(/\A"|"\Z/, '') ] }

          when (text = @ss.scan(/'.*?'/))
             action { [:STRING, text.gsub!(/\A'|'\Z/, '') ] }

          when (text = @ss.scan(/[\s]*:[\s]*/))
             action { [:SEPARATOR, text] }

          when (text = @ss.scan(/[\s]*,[\s]*/))
             action { [:COMMA, text] }

          when (text = @ss.scan(/\[B;[\s]*?/))
             action { [:BYTE_ARRAY, text] }

          when (text = @ss.scan(/\[I;[\s]*?/))
             action { [:INT_ARRAY, text]  }

          when (text = @ss.scan(/\[L;[\s]*?/))
             action { [:LONG_ARRAY, text] }

          when (text = @ss.scan(/\[[\s]*?/))
             action { [:LIST_ARRAY, text] }

          when (text = @ss.scan(/[\s]*\]/))
             action { [:END_ARRAY, text]  }

          when (text = @ss.scan(/-?[0-9]*\.[0-9]+[Ff]/))
             action { [:FLOAT,  text.chop.to_f         ] }

          when (text = @ss.scan(/-?[0-9]*\.[0-9]+[Dd]?/))
             action { [:DOUBLE, text.tr('Dd', '').to_f ] }

          when (text = @ss.scan(/-?([0-9]+)[Bb]/))
             action { [:BYTE,   text.chop.to_i         ] }

          when (text = @ss.scan(/-?([0-9]+)[Ss]/))
             action { [:SHORT,  text.chop.to_i         ] }

          when (text = @ss.scan(/-?([0-9]+)[Ll]/))
             action { [:LONG,   text.chop.to_i         ] }

          when (text = @ss.scan(/-?([0-9]+)/))
             action { [:INT,    text.to_i              ] }

          when (text = @ss.scan(/[\s]+/))
             action { [:WHITESPACE, text] }

          when (text = @ss.scan(/[\S]+/))
             action { [:STRING, text] }

          when (text = @ss.scan(/./))
             action { [:CHAR, 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
  token
end

#action ⇒ Object 



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# File 'lib/craftbook/nbt/snbt/lexer.rb', line 25

def action
  yield
end

#load_file(filename) ⇒ Object 



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# File 'lib/craftbook/nbt/snbt/lexer.rb', line 35

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

#next_token ⇒ Object 



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# File 'lib/craftbook/nbt/snbt/lexer.rb', line 48

def next_token
  return if @ss.eos?

  # skips empty actions
  until token = _next_token or @ss.eos?; end
  token
end

#scan_file(filename) ⇒ Object 



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# File 'lib/craftbook/nbt/snbt/lexer.rb', line 42

def scan_file( filename )
  load_file(filename)
  do_parse
end

#scan_setup(str) ⇒ Object 



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# File 'lib/craftbook/nbt/snbt/lexer.rb', line 19

def scan_setup(str)
  @ss = StringScanner.new(str)
  @lineno =  1
  @state  = nil
end

#scan_str(str) ⇒ Object Also known as: scan 



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# File 'lib/craftbook/nbt/snbt/lexer.rb', line 29

def scan_str(str)
  scan_setup(str)
  do_parse
end

#tokenize(code) ⇒ Object 



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# File 'lib/craftbook/nbt/snbt/lexer.rb', line 144

def tokenize(code)
  scan_setup(code)
  if block_given?
    while token = next_token
      yield Token.new(*token)
    end
    return self
  end
  tokens = []
  while token = next_token
    tokens << Token.new(*token)
  end
  tokens
end