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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 814



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 826



alias dereference symbol


  








  

    #hash   (readonly)
  



  

    

Alias for #ident.


  



  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 829



alias hash ident


  








  

    #head?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 846



def head?
  @index == 0
end


  








  

    #ident   (readonly)
    Also known as: #hash
  

  [ GitHub ]


  

  


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



attr_reader :ident


  








  

    #index   (readonly)
  

  [ GitHub ]


  

  


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



attr_reader :index


  








  

    #reduce?   (readonly)
  



  

    

Alias for #reduce.


  



  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 831



alias reduce? reduce


  








  

    #rule   (readonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 822



attr_reader :rule


  








  

    #symbol   (readonly)
    Also known as: #dereference
  

  [ GitHub ]


  

  


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



attr_reader :symbol


  







Instance Method Details



  

    #==(ot)  
  



  

    

Alias for #eql?.


  



  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 844



alias == eql?


  








  

    #before(len)  
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 856



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


  








  

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



  

    
  





  


  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 840



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


  








  

    #increment  
  



  

    

Alias for #next.


  



  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 854



alias increment next


  








  

    #inspect  
  



  

    

Alias for #to_s.


  



  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 838



alias inspect to_s


  








  

    #next  
    Also known as: #increment
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 850



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


  








  

    #ptr_bug!   (private)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 862



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 830



attr_reader :reduce


  








  

    #to_s  
    Also known as: #inspect
  

  [ GitHub ]


  

  


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



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