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 814
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 856
def before(len)
  @rule.ptrs[@index - len] or ptr_bug!
end
eql?(ot) click to toggle source
# File lib/racc/grammar.rb, line 840
def eql?(ot)
  @hash == ot.hash
end
Also aliased as: ==
head?() click to toggle source
# File lib/racc/grammar.rb, line 846
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 850
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 833
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 862
def ptr_bug!
  raise "racc: fatal: pointer not exist: self: #{to_s}"
end