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Class: Racc::Rule

Relationships & Source Files
Inherits: Object
Defined in: lib/racc/grammar.rb

Class Method Summary

Instance Attribute Summary

Instance Method Summary

Constructor Details

.new(target, syms, act) ⇒ Rule

[ GitHub ] 

  


# File 'lib/racc/grammar.rb', line 603



def initialize(target, syms, act)
  @target = target
  @symbols = syms
  @action = act
  @alternatives = []

  @ident = nil
  @hash = nil
  @ptrs = nil
  @precedence = nil
  @specified_prec = nil
  @null = nil
  @useless = nil
end


  







Instance Attribute Details



  

    #accept?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 702



def accept?
  if tok = @symbols[-1]
    tok.anchor?
  else
    false
  end
end


  








  

    #action   (readonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 620



attr_reader :action


  








  

    #empty?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 694



def empty?
  @symbols.empty?
end


  








  

    #hash   (rw)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 638



attr_reader :hash


  








  

    #hash=(n)   (rw)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 641



def hash=(n)
  @hash = n
  ptrs = []
  @symbols.each_with_index do |sym, idx|
    ptrs.push LocationPointer.new(self, idx, sym)
  end
  ptrs.push LocationPointer.new(self, @symbols.size, nil)
  @ptrs = ptrs
end


  








  

    #ident   (rw)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 636



attr_accessor :ident


  








  

    #null=(n)   (writeonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 673



def null=(n)    @null = n end


  








  

    #precedence   (rw)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 651



def precedence
  @specified_prec || @precedence
end


  








  

    #precedence=(sym)   (rw)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 655



def precedence=(sym)
  @precedence ||= sym
end


  








  

    #ptrs   (readonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 639



attr_reader :ptrs


  








  

    #specified_prec   (rw)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 670



attr_accessor :specified_prec


  








  

    #symbols   (readonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 619



attr_reader :symbols


  








  

    #target   (rw)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 618



attr_accessor :target


  








  

    #useless=(u)   (writeonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 676



def useless=(u) @useless = u end


  







Instance Method Details



  

    #==(other)  
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 682



def ==(other)
  other.kind_of?(Rule) and @ident == other.ident
end


  








  

    #[](idx)  
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 686



def [](idx)
  @symbols[idx]
end


  








  

    #each(&block)  
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 710



def each(&block)
  @symbols.each(&block)
end


  








  

    #each_rule {|_self| ... } 
  



  

    
  





  
Yields:


    
  
  • 
    (_self)
  
    • 



Yield Parameters:


    
  
  • 
    _self
    (Rule)
—    
    

    the object that the method was called on
    

    
  
    • 





  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 631



def each_rule(&block)
  yield self
  @alternatives.each(&block)
end


  








  

    #inspect  
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 678



def inspect
  "#<Racc::Rule id=#{@ident} (#{@target})>"
end


  








  

    #nullable?  ⇒ Boolean 
  



  

    
  





  


  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 672



def nullable?() @null end


  








  

    #prec(sym, &block)  
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 659



def prec(sym, &block)
  @specified_prec = sym
  if block
    unless @action.empty?
      raise CompileError, 'both of rule action block and prec block given'
    end
    @action = UserAction.proc(block)
  end
  self
end


  








  

    #replace(src, dest)  
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 714



def replace(src, dest)
  @target = dest
  @symbols = @symbols.map {|s| s == src ? dest : s }
end


  








  

    #rule  
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 627



def rule
  self
end


  








  

    #size  
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 690



def size
  @symbols.size
end


  








  

    #to_s  
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 698



def to_s
  "#<rule#{@ident}>"
end


  








  

    #useless?  ⇒ Boolean  (writeonly)
  



  

    
  





  


  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 675



def useless?()  @useless end


  








  

    #|(x)  
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 622



def |(x)
  @alternatives.push x.rule
  self
end