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)

Source

# File lib/racc/grammar.rb, line 891
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)

Source

# File lib/racc/grammar.rb, line 933
def before(len)
  @rule.ptrs[@index - len] or ptr_bug!
end

eql? (ot)

Source

# File lib/racc/grammar.rb, line 917
def eql?(ot)
  @hash == ot.hash
end

Also aliased as: ==

head? ()

Source

# File lib/racc/grammar.rb, line 923
def head?
  @index == 0
end

increment ()

Alias for: next

inspect ()

Alias for: to_s

next ()

Source

# File lib/racc/grammar.rb, line 927
def next
  @rule.ptrs[@index + 1] or ptr_bug!
end

Also aliased as: increment

to_s ()

Source

# File lib/racc/grammar.rb, line 910
def to_s
  sprintf('(%d,%d %s)',
          @rule.ident, @index, (reduce?() ? '#' : @symbol.to_s))
end

Also aliased as: inspect

Private Instance Methods

ptr_bug! ()

Source

# File lib/racc/grammar.rb, line 939
def ptr_bug!
  raise "racc: fatal: pointer not exist: self: #{to_s}"
end