class Racc::LocationPointer - racc-1.4.12 Documentation

# class Racc::LocationPointer

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.

### Attributes

dereference[R]
hash[R]
ident[R]
index[R]
reduce[R]
reduce?[R]
rule[R]
symbol[R]

### Public Class Methods

new(rule, i, sym) click to toggle source

    # File lib/racc/grammar.rb, line 811
    def initialize(rule, i, sym)
      @rule   = rule
      @index  = i
      @symbol = sym
      @ident  = @rule.hash + i
      @reduce = sym.nil?
    end

### Public Instance Methods

==(ot)
Alias for: eql?
before(len) click to toggle source

    # File lib/racc/grammar.rb, line 853
    def before(len)
      @rule.ptrs[@index - len] or ptr_bug!
    end

eql?(ot) click to toggle source

    # File lib/racc/grammar.rb, line 837
    def eql?(ot)
      @hash == ot.hash
    end

Also aliased as: ==
head?() click to toggle source

    # File lib/racc/grammar.rb, line 843
    def head?
      @index == 0
    end

increment()
Alias for: next
inspect()
Alias for: to_s
next() click to toggle source

    # File lib/racc/grammar.rb, line 847
    def next
      @rule.ptrs[@index + 1] or ptr_bug!
    end

Also aliased as: increment
to_s() click to toggle source

    # File lib/racc/grammar.rb, line 830
    def to_s
      sprintf('(%d,%d %s)',
              @rule.ident, @index, (reduce?() ? '#' : @symbol.to_s))
    end

Also aliased as: inspect

### Private Instance Methods

ptr_bug!() click to toggle source

    # File lib/racc/grammar.rb, line 859
    def ptr_bug!
      raise "racc: fatal: pointer not exist: self: #{to_s}"
    end