class Racc::ActionTable

The table of LALR actions. Actions are either of Shift, Reduce, Accept and Error.

Attributes

accept[R]

error[R]

Public Class Methods

new(rt, st) click to toggle source

# File lib/racc/state.rb, line 813
def initialize(rt, st)
  @grammar = rt
  @statetable = st

  @reduce = []
  @shift = []
  @accept = nil
  @error = nil
end

Public Instance Methods

each_reduce(&block) click to toggle source

# File lib/racc/state.rb, line 851
def each_reduce(&block)
  @reduce.each(&block)
end

each_shift(&block) click to toggle source

# File lib/racc/state.rb, line 870
def each_shift(&block)
  @shift.each(&block)
end

init() click to toggle source

# File lib/racc/state.rb, line 823
def init
  @grammar.each do |rule|
    @reduce.push Reduce.new(rule)
  end
  @statetable.each do |state|
    @shift.push Shift.new(state)
  end
  @accept = Accept.new
  @error = Error.new
end

reduce(i) click to toggle source

# File lib/racc/state.rb, line 838
def reduce(i)
  case i
  when Rule    then i = i.ident
  when Integer then ;
  else
    raise "racc: fatal: wrong class #{i.class} for reduce"
  end

  r = @reduce[i] or raise "racc: fatal: reduce action #{i.inspect} not exist"
  r.incref
  r
end

reduce_n() click to toggle source

# File lib/racc/state.rb, line 834
def reduce_n
  @reduce.size
end

shift(i) click to toggle source

# File lib/racc/state.rb, line 859
def shift(i)
  case i
  when State   then i = i.ident
  when Integer then ;
  else
    raise "racc: fatal: wrong class #{i.class} for shift"
  end

  @shift[i] or raise "racc: fatal: shift action #{i} does not exist"
end

shift_n() click to toggle source

# File lib/racc/state.rb, line 855
def shift_n
  @shift.size
end