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