123456789_123456789_123456789_123456789_123456789_

Class: Racc::LocationPointer

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

Overview

A set of rule and position in it’s RHS. Note that the number of pointers is more than rule’s RHS array, because pointer points right edge of the final symbol when reducing.

Class Method Summary

Instance Attribute Summary

Instance Method Summary

Constructor Details

.new(rule, i, sym) ⇒ LocationPointer

[ GitHub ] 

  


# File 'lib/racc/grammar.rb', line 809



def initialize(rule, i, sym)
  @rule   = rule
  @index  = i
  @symbol = sym
  @ident  = @rule.hash + i
  @reduce = sym.nil?
end


  







Instance Attribute Details



  

    #dereference   (readonly)
  



  

    

Alias for #symbol.


  



  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 821



alias dereference symbol


  








  

    #hash   (readonly)
  



  

    

Alias for #ident.


  



  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 824



alias hash ident


  








  

    #head?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 841



def head?
  @index == 0
end


  








  

    #ident   (readonly)
    Also known as: #hash
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 823



attr_reader :ident


  








  

    #index   (readonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 818



attr_reader :index


  








  

    #reduce?   (readonly)
  



  

    

Alias for #reduce.


  



  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 826



alias reduce? reduce


  








  

    #rule   (readonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 817



attr_reader :rule


  








  

    #symbol   (readonly)
    Also known as: #dereference
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 819



attr_reader :symbol


  







Instance Method Details



  

    #==(ot)  
  



  

    

Alias for #eql?.


  



  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 839



alias == eql?


  








  

    #before(len)  
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 851



def before(len)
  @rule.ptrs[@index - len] or ptr_bug!
end


  








  

    #eql?(ot)  ⇒ Boolean 
    Also known as: #==
  



  

    
  





  


  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 835



def eql?(ot)
  @hash == ot.hash
end


  








  

    #increment  
  



  

    

Alias for #next.


  



  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 849



alias increment next


  








  

    #inspect  
  



  

    

Alias for #to_s.


  



  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 833



alias inspect to_s


  








  

    #next  
    Also known as: #increment
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 845



def next
  @rule.ptrs[@index + 1] or ptr_bug!
end


  








  

    #ptr_bug!   (private)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 857



def ptr_bug!
  raise "racc: fatal: pointer not exist: self: #{to_s}"
end


  








  

    #reduce   (readonly)
    Also known as: #reduce?
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 825



attr_reader :reduce


  








  

    #to_s  
    Also known as: #inspect
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 828



def to_s
  sprintf('(%d,%d %s)',
          @rule.ident, @index, (reduce?() ? '#' : @symbol.to_s))
end