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Class: Racc::ActionTable

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

Overview

The table of LALR actions. Actions are either of Shift, Reduce, Accept and Error.

Class Method Summary

Instance Attribute Summary

Instance Method Summary

Constructor Details

.new(rt, st) ⇒ ActionTable

[ GitHub ] 

  


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



def initialize(rt, st)
  @grammar = rt
  @statetable = st

  @reduce = []
  @shift = []
  @accept = nil
  @error = nil
end


  







Instance Attribute Details



  

    #accept   (readonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/state.rb', line 878



attr_reader :accept


  








  

    #error   (readonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/state.rb', line 879



attr_reader :error


  







Instance Method Details



  

    #each_reduce(&block)  
  

  [ GitHub ]


  

  


# File 'lib/racc/state.rb', line 855



def each_reduce(&block)
  @reduce.each(&block)
end


  








  

    #each_shift(&block)  
  

  [ GitHub ]


  

  


# File 'lib/racc/state.rb', line 874



def each_shift(&block)
  @shift.each(&block)
end


  








  

    #init  
  

  [ GitHub ]


  

  


# File 'lib/racc/state.rb', line 827



def init
  @grammar.each do |rule|
    @reduce.push Reduce.new(rule)
  end
  @statetable.each do |state|
    @shift.push Shift.new(state)
  end
  @accept = Accept.new
  @error = Error.new
end


  








  

    #reduce(i)  
  

  [ GitHub ]


  

  


# File 'lib/racc/state.rb', line 842



def reduce(i)
  case i
  when Rule    then i = i.ident
  when Integer then ;
  else
    raise "racc: fatal: wrong class #{i.class} for reduce"
  end

  r = @reduce[i] or raise "racc: fatal: reduce action #{i.inspect} not exist"
  r.incref
  r
end


  








  

    #reduce_n  
  

  [ GitHub ]


  

  


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



def reduce_n
  @reduce.size
end


  








  

    #shift(i)  
  

  [ GitHub ]


  

  


# File 'lib/racc/state.rb', line 863



def shift(i)
  case i
  when State   then i = i.ident
  when Integer then ;
  else
    raise "racc: fatal: wrong class #{i.class} for shift"
  end

  @shift[i] or raise "racc: fatal: shift action #{i} does not exist"
end


  








  

    #shift_n  
  

  [ GitHub ]


  

  


# File 'lib/racc/state.rb', line 859



def shift_n
  @shift.size
end