Class: Vertigo::Token

Inherits:
Object
  • Object
show all
Defined in:
lib/vertigo/token.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(tab) ⇒ Token

Returns a new instance of Token.



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# File 'lib/vertigo/token.rb', line 5

def initialize tab
  @kind,@val,@pos=*tab
end

Instance Attribute Details

#kind ⇒ Object

Returns the value of attribute kind.



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# File 'lib/vertigo/token.rb', line 4

def kind
  @kind
end

#pos ⇒ Object

Returns the value of attribute pos.



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# File 'lib/vertigo/token.rb', line 4

def pos
  @pos
end

#val ⇒ Object

Returns the value of attribute val.



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# File 'lib/vertigo/token.rb', line 4

def val
  @val
end

Class Method Details

.create(kind, str) ⇒ Object 



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# File 'lib/vertigo/token.rb', line 47

def self.create kind,str
  Token.new [kind,str,[0,0]]
end

Instance Method Details

#accept(visitor, args = nil) ⇒ Object 



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# File 'lib/vertigo/token.rb', line 43

def accept visitor,args=nil
  visitor.visitToken(self)
end

#clone ⇒ Object 



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# File 'lib/vertigo/token.rb', line 59

def clone
  Token.new([@kind,@val,@pos])
end

#is_a?(kind) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/vertigo/token.rb', line 9

def is_a? kind
  case kind
  when Symbol
    return @kind==kind
  when Array
    for sym in kind
      return true if @kind==sym
    end
    return false
  else
    raise "wrong type during lookahead"
  end
end

#is_not_a?(kind) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/vertigo/token.rb', line 28

def is_not_a? kind
  case kind
  when Symbol
    return @kind!=kind
  when Array
    ret=true
    for sym in kind
      ret=false if @kind==sym
    end
    return ret
  else
    raise "wrong type during lookahead"
  end
end

#line ⇒ Object 



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# File 'lib/vertigo/token.rb', line 63

def line
  pos.first
end

#not_a?(kind) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/vertigo/token.rb', line 23

def not_a? kind
  result=self.is_a? kind
  !result
end

#str ⇒ Object

def inspect

"(#{@kind.to_s.ljust(15,' ')},'#{@val}',#{@pos})"

end



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# File 'lib/vertigo/token.rb', line 55

def str
  val
end