module Hoe::Racc

def activate_racc_deps
  dependency "racc", "~> 1.5", :development
  dependency "oedipus_lex", "~> 2.6", :development
end

def define_racc_tasks
  y_files      = self.spec.files.grep(/\.y$/)
  yy_files     = self.spec.files.grep(/\.yy$/)
  rex_files    = self.spec.files.grep(/\.rex$/)
  yy_re = Regexp.union yy_files.map { |s| s.delete_suffix ".yy" }
  parser_files =
    y_files.map { |f| f.sub(/\.y$/, ".rb") } +
    spec.files.grep(/(#{yy_re})\d+\.rb$/) -
    yy_files
  lexer_files  = rex_files.map  { |f| f.sub(/\.rex$/, ".rex.rb") }
  self.clean_globs += parser_files
  self.clean_globs += lexer_files
  rule ".rb" => ".y" do |t|
    begin
      sh "racc #{racc_flags} -o #{t.name} #{t.source}"
    rescue
      abort "need racc, sudo gem install racc"
    end
  end
  # HACK: taken from oedipus_lex's .rake file to bypass isolate bootstrap
  rule ".rex.rb" => proc { |path| path.sub(/\.rb$/, "") } do |t|
    require "oedipus_lex"
    warn "Generating #{t.name} from #{t.source} from #{OedipusLex::VERSION}"
    oedipus = OedipusLex.new oedipus_options
    oedipus.parse_file t.source
    File.open t.name, "w" do |f|
      f.write oedipus.generate
    end
  end
  task :isolate # stub task
  multitask :parser # make them multithreaded!
  multitask :lexer
  desc "build the parser" unless parser_files.empty?
  task :parser => :isolate
  desc "build the lexer" unless lexer_files.empty?
  task :lexer  => :isolate
  task :parser => parser_files
  task :lexer  => lexer_files
  racc_tasks.each do |t|
    task t => [:parser, :lexer]
  end
end # define_racc_tasks

def initialize_racc
  self.racc_tasks = [:multi, :test, :check_manifest]
  # -v = verbose
  # -l = no-line-convert (they don't ever line up anyhow)
  self.racc_flags ||= +"-v -l"
  self.oedipus_options ||= {
                            :do_parse => false,
                           }
end