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require 'fileutils'
require 'rdoc/ri'

class RDoc::RI::Writer

  def self.class_desc_path(dir, class_desc)
    File.join(dir, "cdesc-" + class_desc.name + ".yaml")
  end

  ##
  # Convert a name from internal form (containing punctuation) to an external
  # form (where punctuation is replaced by %xx)

  def self.internal_to_external(name)
    if ''.respond_to? :ord then
      name.gsub(/\W/) { "%%%02x" % $&[0].ord }
    else
      name.gsub(/\W/) { "%%%02x" % $&[0] }
    end
  end

  ##
  # And the reverse operation

  def self.external_to_internal(name)
    name.gsub(/%([0-9a-f]{2,2})/) { $1.to_i(16).chr }
  end

  def initialize(base_dir)
    @base_dir = base_dir
  end

  def remove_class(class_desc)
    FileUtils.rm_rf(path_to_dir(class_desc.full_name))
  end

  def add_class(class_desc)
    dir = path_to_dir(class_desc.full_name)
    FileUtils.mkdir_p(dir)
    class_file_name = self.class.class_desc_path(dir, class_desc)
    File.open(class_file_name, "w") do |f|
      f.write(class_desc.serialize)
    end
  end

  def add_method(class_desc, method_desc)
    dir = path_to_dir(class_desc.full_name)
    file_name = self.class.internal_to_external(method_desc.name)
    meth_file_name = File.join(dir, file_name)
    if method_desc.is_singleton
      meth_file_name += "-c.yaml"
    else
      meth_file_name += "-i.yaml"
    end

    File.open(meth_file_name, "w") do |f|
      f.write(method_desc.serialize)
    end
  end

  private

  def path_to_dir(class_name)
    File.join(@base_dir, *class_name.split('::'))
  end

end