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Class: Racc::SymbolTable

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Instance Chain:
self, Enumerable
Inherits: Object
Defined in: lib/racc/grammar.rb

Class Method Summary

Instance Attribute Summary

Instance Method Summary

Constructor Details

.new ⇒ SymbolTable

[ GitHub ] 

  


# File 'lib/racc/grammar.rb', line 950



def initialize
  @symbols = []   # :: [Racc::Sym]
  @cache   = {}   # :: {(String|Symbol) => Racc::Sym}
  @dummy  = intern(:$start, true)
  @anchor = intern(false, true)     # Symbol ID = 0
  @error  = intern(:error, false)   # Symbol ID = 1
end


  







Instance Attribute Details



  

    #anchor   (readonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 959



attr_reader :anchor


  








  

    #dummy   (readonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 958



attr_reader :dummy


  








  

    #error   (readonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 960



attr_reader :error


  








  

    #nt_base   (readonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 983



attr_reader :nt_base


  








  

    #symbols   (readonly)
    Also known as: #to_a
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 975



attr_reader :symbols


  








  

    #to_a   (readonly)
  



  

    

Alias for #symbols.


  



  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 976



alias to_a symbols


  







Instance Method Details



  

    #[](id)  
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 962



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


  








  

    #check_terminals   (private)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 1027



def check_terminals
  return unless @symbols.any? {|s| s.should_terminal? }
  @anchor.should_terminal
  @error.should_terminal
  each_terminal do |t|
    t.should_terminal if t.string_symbol?
  end
  each do |s|
    s.should_terminal if s.assoc
  end
  terminals().reject {|t| t.should_terminal? }.each do |t|
    raise CompileError, "terminal #{t} not declared as terminal"
  end
  nonterminals().select {|n| n.should_terminal? }.each do |n|
    raise CompileError, "symbol #{n} declared as terminal but is not terminal"
  end
end


  








  

    #delete(sym)  
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 978



def delete(sym)
  @symbols.delete sym
  @cache.delete sym.value
end


  








  

    #each(&block)  
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 989



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


  








  

    #each_nonterminal(&block)  
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 1005



def each_nonterminal(&block)
  @nterms.each(&block)
end


  








  

    #each_terminal(&block)  
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 997



def each_terminal(&block)
  @terms.each(&block)
end


  








  

    #fix  
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 1009



def fix
  terms, nterms = @symbols.partition {|s| s.terminal? }
  @symbols = terms + nterms
  @terms = terms
  @nterms = nterms
  @nt_base = terms.size
  fix_ident
  check_terminals
end


  








  

    #fix_ident   (private)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 1021



def fix_ident
  @symbols.each_with_index do |t, i|
    t.ident = i
  end
end


  








  

    #intern(val, dummy = false)  
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 966



def intern(val, dummy = false)
  @cache[val] ||=
      begin
        sym = Sym.new(val, dummy)
        @symbols.push sym
        sym
      end
end


  








  

    #nonterminals  
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 1001



def nonterminals
  @symbols[@nt_base, @symbols.size - @nt_base]
end


  








  

    #nt_max  
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 985



def nt_max
  @symbols.size
end


  








  

    #terminals(&block)  
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 993



def terminals(&block)
  @symbols[0, @nt_base]
end