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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 891



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 903



alias dereference symbol


  








  

    #hash   (readonly)
  



  

    

Alias for #ident.


  



  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 906



alias hash ident


  








  

    #head?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 923



def head?
  @index == 0
end


  








  

    #ident   (readonly)
    Also known as: #hash
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 905



attr_reader :ident


  








  

    #index   (readonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 900



attr_reader :index


  








  

    #reduce?   (readonly)
  



  

    

Alias for #reduce.


  



  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 908



alias reduce? reduce


  








  

    #rule   (readonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 899



attr_reader :rule


  








  

    #symbol   (readonly)
    Also known as: #dereference
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 901



attr_reader :symbol


  







Instance Method Details



  

    #==(ot)  
  



  

    

Alias for #eql?.


  



  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 921



alias == eql?


  








  

    #before(len)  
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 933



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


  








  

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



  

    
  





  


  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 917



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


  








  

    #increment  
  



  

    

Alias for #next.


  



  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 931



alias increment next


  








  

    #inspect  
  



  

    

Alias for #to_s.


  



  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 915



alias inspect to_s


  








  

    #next  
    Also known as: #increment
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 927



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


  








  

    #ptr_bug!   (private)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 939



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 907



attr_reader :reduce


  








  

    #to_s  
    Also known as: #inspect
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 910



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