# -*- mode: ruby; coding: us-ascii -*-
firstline, predefined = __LINE__+1, %[\
  freeze
  inspect
  intern
  object_id
  const_missing
  method_missing                                        MethodMissing
  method_added
  singleton_method_added
  method_removed
  singleton_method_removed
  method_undefined
  singleton_method_undefined
  length
  size
  gets
  succ
  each
  proc
  lambda
  send
  __send__
  __attached__
  initialize
  initialize_copy
  initialize_clone
  initialize_dup
  to_int
  to_ary
  to_str
  to_sym
  to_hash
  to_proc
  to_io
  to_a
  to_s
  to_i
  bt
  bt_locations
  call

  _                                                     UScore
  "/*NULL*/"                                            NULL
  empty?
  eql?
  respond_to?                                           Respond_to
  respond_to_missing?                                   Respond_to_missing
  <IFUNC>
  <CFUNC>
  core#set_method_alias
  core#set_variable_alias
  core#undef_method
  core#define_method
  core#define_singleton_method
  core#set_postexe
  core#hash_from_ary
  core#hash_merge_ary
  core#hash_merge_ptr
  core#hash_merge_kwd
]

class KeywordError < RuntimeError
  def self.raise(mesg, line)
    super(self, mesg, ["#{__FILE__}:#{line}", *caller])
  end
end

predefined_ids = {}
preserved_ids = []
local_ids = []
instance_ids = []
global_ids = []
const_ids = []
class_ids = []
attrset_ids = []
names = {}
predefined.split(/^/).each_with_index do |line, num|
  next if /^#/ =~ line
  line.sub!(/\s+#.*/, '')
  name, token = line.split
  next unless name
  token ||= name
  if /#/ =~ token
    token = "_#{token.gsub(/\W+/, '_')}"
  else
    token = token.sub(/\?/, 'P').sub(/\A[a-z]/) {$&.upcase}
    token.sub!(/\A\$/, "_G_")
    token.sub!(/\A@@/, "_C_")
    token.sub!(/\A@/, "_I_")
    token.gsub!(/\W+/, "")
  end
  if prev = names[name]
    KeywordError.raise("#{name} is already registered at line #{prev+firstline}", firstline+num)
  end
  if prev = predefined_ids[token]
    KeywordError.raise("#{token} is already used for #{prev} at line #{names[prev]+firstline}", firstline+num)
  end
  names[name] = num
  case name
  when /\A[A-Z]\w*\z/; const_ids
  when /\A(?!\d)\w+\z/; local_ids
  when /\A\$(?:\d+|(?!\d)\w+)\z/; global_ids
  when /\A@@(?!\d)\w+\z/; class_ids
  when /\A@(?!\d)\w+\z/; instance_ids
  when /\A((?!\d)\w+)=\z/; attrset_ids
  else preserved_ids
  end << token
  predefined_ids[token] = name
end
{
  "LOCAL" => local_ids,
  "INSTANCE" => instance_ids,
  "GLOBAL" => global_ids,
  "CONST" => const_ids,
  "CLASS" => class_ids,
  "ATTRSET" => attrset_ids,
  :preserved => preserved_ids,
  :predefined => predefined_ids,
}