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Class: Racc::Sym

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

Overview

Stands terminal and nonterminal symbols.

Class Method Summary

Instance Attribute Summary

Instance Method Summary

Constructor Details

.new(value, dummyp) ⇒ Sym

[ GitHub ] 

  


# File 'lib/racc/grammar.rb', line 969



def initialize(value, dummyp)
  @ident = nil
  @value = value
  @dummyp = dummyp

  @term  = nil
  @nterm = nil
  @should_terminal = false
  @precedence = nil
  case value
  when Symbol
    @to_s = value.to_s
    @serialized = value.inspect
    @string = false
  when String
    @to_s = value.inspect
    @serialized = value.dump
    @string = true
  when false
    @to_s = '$end'
    @serialized = 'false'
    @string = false
  when ErrorSymbolValue
    @to_s = 'error'
    @serialized = 'Object.new'
    @string = false
  else
    raise ArgumentError, "unknown symbol value: #{value.class}"
  end

  @heads    = []
  @locate   = []
  @snull    = nil
  @null     = nil
  @expand   = nil
  @useless  = nil
end


  







Class Method Details



  

    .once_writer(nm)  
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 1008



def once_writer(nm)
  nm = nm.id2name
  module_eval(<<-EOS)
    def #{nm}=(v)
      raise 'racc: fatal: @#{nm} != nil' unless @#{nm}.nil?
      @#{nm} = v
    end
  EOS
end


  







Instance Attribute Details



  

    #assoc   (rw)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 1063



attr_accessor :assoc


  








  

    #dummy?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 1026



def dummy?
  @dummyp
end


  








  

    #expand   (readonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 1100



attr_reader :expand


  








  

    #hash   (readonly)
  



  

    

Alias for #ident.


  



  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 1022



alias hash ident


  








  

    #heads   (readonly)
  



  

    

cache


  



  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 1083



attr_reader :heads


  








  

    #ident   (readonly)
    Also known as: #hash
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 1020



attr_reader :ident


  








  

    #locate   (readonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 1084



attr_reader :locate


  








  

    #nonterminal?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 1034



def nonterminal?
  @nterm
end


  








  

    #null=(n)   (writeonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 1096



def null=(n)
  @null = n
end


  








  

    #nullable?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 1092



def nullable?
  @null
end


  








  

    #precedence   (rw)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 1062



attr_accessor :precedence


  








  

    #self_null?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 1086



def self_null?
  @snull
end


  








  

    #serialized=(value)   (writeonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 1060



attr_writer :serialized


  








  

    #should_terminal   (readonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 1044



def should_terminal
  @should_terminal = true
end


  








  

    #should_terminal?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 1048



def should_terminal?
  @should_terminal
end


  








  

    #string_symbol?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 1052



def string_symbol?
  @string
end


  








  

    #term=(t)   (writeonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 1038



def term=(t)
  raise 'racc: fatal: term= called twice' unless @term.nil?
  @term = t
  @nterm = !t
end


  








  

    #terminal?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 1030



def terminal?
  @term
end


  








  

    #useless=(f)   (rw)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 1107



def useless=(f)
  @useless = f
end


  








  

    #useless?  ⇒ Boolean  (rw)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 1103



def useless?
  @useless
end


  








  

    #value   (readonly)
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 1024



attr_reader :value


  







Instance Method Details



  

    #inspect  
  



  

    

Alias for #to_s.


  



  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 1069



alias inspect to_s


  








  

    #rule  
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 1075



def rule
  Rule.new(nil, [self], UserAction.empty)
end


  








  

    #serialize  
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 1056



def serialize
  @serialized
end


  








  

    #to_s  
    Also known as: #inspect
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 1065



def to_s
  @to_s.dup
end


  








  

    #|(x)  
  

  [ GitHub ]


  

  


# File 'lib/racc/grammar.rb', line 1071



def |(x)
  rule() | x.rule
end