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EDIT :: utils.rb

# frozen_string_literal: false
#
# Copyright (C) 2001, 2002, 2003 by Michael Neumann (mneumann@ntecs.de)
#
# $Id: utils.rb 53141 2015-12-16 05:07:31Z naruse $
#
module XMLRPC # :nodoc:

# This module enables a user-class to be marshalled
  # by XML-RPC for Ruby into a Hash, with one additional
  # key/value pair <code>___class___ => ClassName</code>
  #
  module Marshallable
  end

# Defines ParserWriterChooseMixin, which makes it possible to choose a
  # different XMLWriter and/or XMLParser then the default one.
  #
  # The Mixin is used in client.rb (class XMLRPC::Client)
  # and server.rb (class XMLRPC::BasicServer)
  module ParserWriterChooseMixin

# Sets the XMLWriter to use for generating XML output.
    #
    # Should be an instance of a class from module XMLRPC::XMLWriter.
    #
    # If this method is not called, then XMLRPC::Config::DEFAULT_WRITER is used.
    def set_writer(writer)
      @create = Create.new(writer)
      self
    end

# Sets the XMLParser to use for parsing XML documents.
    #
    # Should be an instance of a class from module XMLRPC::XMLParser.
    #
    # If this method is not called, then XMLRPC::Config::DEFAULT_PARSER is used.
    def set_parser(parser)
      @parser = parser
      self
    end

private

def create
      # if set_writer was not already called then call it now
      if @create.nil? then
        set_writer(Config::DEFAULT_WRITER.new)
      end
      @create
    end

def parser
      # if set_parser was not already called then call it now
      if @parser.nil? then
        set_parser(Config::DEFAULT_PARSER.new)
      end
      @parser
    end

end # module ParserWriterChooseMixin

module Service

# Base class for XMLRPC::Service::Interface definitions, used
  # by XMLRPC::BasicServer#add_handler
  class BasicInterface
    attr_reader :prefix, :methods

def initialize(prefix)
      @prefix = prefix
      @methods = []
    end

def add_method(sig, help=nil, meth_name=nil)
      mname = nil
      sig = [sig] if sig.kind_of? String

sig = sig.collect do |s|
        name, si = parse_sig(s)
        raise "Wrong signatures!" if mname != nil and name != mname
        mname = name
        si
      end

@methods << [mname, meth_name || mname, sig, help]
    end

private

def parse_sig(sig)
      # sig is a String
      if sig =~ /^\s*(\w+)\s+([^(]+)($([^)]*)$)?\s*$/
        params = [$1]
        name   = $2.strip
        $4.split(",").each {|i| params << i.strip} if $4 != nil
        return name, params
      else
        raise "Syntax error in signature"
      end
    end

end # class BasicInterface

#
  # Class which wraps a XMLRPC::Service::Interface definition, used
  # by XMLRPC::BasicServer#add_handler
  #
  class Interface < BasicInterface
    def initialize(prefix, &p)
      raise "No interface specified" if p.nil?
      super(prefix)
      instance_eval(&p)
    end

def get_methods(obj, delim=".")
      prefix = @prefix + delim
      @methods.collect { |name, meth, sig, help|
        [prefix + name.to_s, obj.method(meth).to_proc, sig, help]
      }
    end

private

def meth(*a)
      add_method(*a)
    end

end # class Interface

class PublicInstanceMethodsInterface < BasicInterface
    def initialize(prefix)
      super(prefix)
    end

def get_methods(obj, delim=".")
      prefix = @prefix + delim
      obj.class.public_instance_methods(false).collect { |name|
        [prefix + name.to_s, obj.method(name).to_proc, nil, nil]
      }
    end
  end

end # module Service

#
  # Short-form to create a XMLRPC::Service::Interface
  #
  def self.interface(prefix, &p)
    Service::Interface.new(prefix, &p)
  end

# Short-cut for creating a XMLRPC::Service::PublicInstanceMethodsInterface
  def self.iPIMethods(prefix)
    Service::PublicInstanceMethodsInterface.new(prefix)
  end

module ParseContentType
    def parse_content_type(str)
      a, *b = str.split(";")
      return a.strip.downcase, *b
    end
  end

end # module XMLRPC

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EDIT :: utils.rb