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Current File : /opt/alt/ruby26/lib64/ruby/2.6.0/irb.rb
# frozen_string_literal: false
#
#   irb.rb - irb main module
#       $Release Version: 0.9.6 $
#       $Revision: 66356 $
#       by Keiju ISHITSUKA(keiju@ruby-lang.org)
#
# --
#
#
#
require "e2mmap"

require "irb/init"
require "irb/context"
require "irb/extend-command"

require "irb/ruby-lex"
require "irb/input-method"
require "irb/locale"

require "irb/version"

# IRB stands for "interactive Ruby" and is a tool to interactively execute Ruby
# expressions read from the standard input.
#
# The +irb+ command from your shell will start the interpreter.
#
# == Usage
#
# Use of irb is easy if you know Ruby.
#
# When executing irb, prompts are displayed as follows. Then, enter the Ruby
# expression. An input is executed when it is syntactically complete.
#
#     $ irb
#     irb(main):001:0> 1+2
#     #=> 3
#     irb(main):002:0> class Foo
#     irb(main):003:1>  def foo
#     irb(main):004:2>    print 1
#     irb(main):005:2>  end
#     irb(main):006:1> end
#     #=> nil
#
# The Readline extension module can be used with irb. Use of Readline is
# default if it's installed.
#
# == Command line options
#
#   Usage:  irb.rb [options] [programfile] [arguments]
#     -f                Suppress read of ~/.irbrc
#     -d                Set $DEBUG to true (same as `ruby -d')
#     -r load-module    Same as `ruby -r'
#     -I path           Specify $LOAD_PATH directory
#     -U                Same as `ruby -U`
#     -E enc            Same as `ruby -E`
#     -w                Same as `ruby -w`
#     -W[level=2]       Same as `ruby -W`
#     --inspect         Use `inspect' for output (default except for bc mode)
#     --noinspect       Don't use inspect for output
#     --readline        Use Readline extension module
#     --noreadline      Don't use Readline extension module
#     --prompt prompt-mode
#     --prompt-mode prompt-mode
#                       Switch prompt mode. Pre-defined prompt modes are
#                       `default', `simple', `xmp' and `inf-ruby'
#     --inf-ruby-mode   Use prompt appropriate for inf-ruby-mode on emacs.
#                       Suppresses --readline.
#     --simple-prompt   Simple prompt mode
#     --noprompt        No prompt mode
#     --tracer          Display trace for each execution of commands.
#     --back-trace-limit n
#                       Display backtrace top n and tail n. The default
#                       value is 16.
#     --irb_debug n     Set internal debug level to n (not for popular use)
#     -v, --version     Print the version of irb
#
# == Configuration
#
# IRB reads from <code>~/.irbrc</code> when it's invoked.
#
# If <code>~/.irbrc</code> doesn't exist, +irb+ will try to read in the following order:
#
# * +.irbrc+
# * +irb.rc+
# * +_irbrc+
# * <code>$irbrc</code>
#
# The following are alternatives to the command line options. To use them type
# as follows in an +irb+ session:
#
#     IRB.conf[:IRB_NAME]="irb"
#     IRB.conf[:INSPECT_MODE]=nil
#     IRB.conf[:IRB_RC] = nil
#     IRB.conf[:BACK_TRACE_LIMIT]=16
#     IRB.conf[:USE_LOADER] = false
#     IRB.conf[:USE_READLINE] = nil
#     IRB.conf[:USE_TRACER] = false
#     IRB.conf[:IGNORE_SIGINT] = true
#     IRB.conf[:IGNORE_EOF] = false
#     IRB.conf[:PROMPT_MODE] = :DEFAULT
#     IRB.conf[:PROMPT] = {...}
#     IRB.conf[:DEBUG_LEVEL]=0
#
# === Auto indentation
#
# To enable auto-indent mode in irb, add the following to your +.irbrc+:
#
#     IRB.conf[:AUTO_INDENT] = true
#
# === Autocompletion
#
# To enable autocompletion for irb, add the following to your +.irbrc+:
#
#     require 'irb/completion'
#
# === History
#
# By default, irb disables history and will not store any commands you used.
#
# If you want to enable history, add the following to your +.irbrc+:
#
#     IRB.conf[:SAVE_HISTORY] = 1000
#
# This will now store the last 1000 commands in <code>~/.irb_history</code>.
#
# See IRB::Context#save_history= for more information.
#
# == Customizing the IRB Prompt
#
# In order to customize the prompt, you can change the following Hash:
#
#     IRB.conf[:PROMPT]
#
# This example can be used in your +.irbrc+
#
#     IRB.conf[:PROMPT][:MY_PROMPT] = { # name of prompt mode
#       :AUTO_INDENT => true,           # enables auto-indent mode
#       :PROMPT_I =>  ">> ",		# simple prompt
#       :PROMPT_S => nil,		# prompt for continuated strings
#       :PROMPT_C => nil,		# prompt for continuated statement
#       :RETURN => "    ==>%s\n"	# format to return value
#     }
#
#     IRB.conf[:PROMPT_MODE] = :MY_PROMPT
#
# Or, invoke irb with the above prompt mode by:
#
#     irb --prompt my-prompt
#
# Constants +PROMPT_I+, +PROMPT_S+ and +PROMPT_C+ specify the format. In the
# prompt specification, some special strings are available:
#
#     %N    # command name which is running
#     %m    # to_s of main object (self)
#     %M    # inspect of main object (self)
#     %l    # type of string(", ', /, ]), `]' is inner %w[...]
#     %NNi  # indent level. NN is digits and means as same as printf("%NNd").
#           # It can be omitted
#     %NNn  # line number.
#     %%    # %
#
# For instance, the default prompt mode is defined as follows:
#
#     IRB.conf[:PROMPT_MODE][:DEFAULT] = {
#       :PROMPT_I => "%N(%m):%03n:%i> ",
#       :PROMPT_S => "%N(%m):%03n:%i%l ",
#       :PROMPT_C => "%N(%m):%03n:%i* ",
#       :RETURN => "%s\n" # used to printf
#     }
#
# irb comes with a number of available modes:
#
#   # :NULL:
#   #   :PROMPT_I:
#   #   :PROMPT_N:
#   #   :PROMPT_S:
#   #   :PROMPT_C:
#   #   :RETURN: |
#   #     %s
#   # :DEFAULT:
#   #   :PROMPT_I: ! '%N(%m):%03n:%i> '
#   #   :PROMPT_N: ! '%N(%m):%03n:%i> '
#   #   :PROMPT_S: ! '%N(%m):%03n:%i%l '
#   #   :PROMPT_C: ! '%N(%m):%03n:%i* '
#   #   :RETURN: |
#   #     => %s
#   # :CLASSIC:
#   #   :PROMPT_I: ! '%N(%m):%03n:%i> '
#   #   :PROMPT_N: ! '%N(%m):%03n:%i> '
#   #   :PROMPT_S: ! '%N(%m):%03n:%i%l '
#   #   :PROMPT_C: ! '%N(%m):%03n:%i* '
#   #   :RETURN: |
#   #     %s
#   # :SIMPLE:
#   #   :PROMPT_I: ! '>> '
#   #   :PROMPT_N: ! '>> '
#   #   :PROMPT_S:
#   #   :PROMPT_C: ! '?> '
#   #   :RETURN: |
#   #     => %s
#   # :INF_RUBY:
#   #   :PROMPT_I: ! '%N(%m):%03n:%i> '
#   #   :PROMPT_N:
#   #   :PROMPT_S:
#   #   :PROMPT_C:
#   #   :RETURN: |
#   #     %s
#   #   :AUTO_INDENT: true
#   # :XMP:
#   #   :PROMPT_I:
#   #   :PROMPT_N:
#   #   :PROMPT_S:
#   #   :PROMPT_C:
#   #   :RETURN: |2
#   #         ==>%s
#
# == Restrictions
#
# Because irb evaluates input immediately after it is syntactically complete,
# the results may be slightly different than directly using Ruby.
#
# == IRB Sessions
#
# IRB has a special feature, that allows you to manage many sessions at once.
#
# You can create new sessions with Irb.irb, and get a list of current sessions
# with the +jobs+ command in the prompt.
#
# === Commands
#
# JobManager provides commands to handle the current sessions:
#
#   jobs    # List of current sessions
#   fg      # Switches to the session of the given number
#   kill    # Kills the session with the given number
#
# The +exit+ command, or ::irb_exit, will quit the current session and call any
# exit hooks with IRB.irb_at_exit.
#
# A few commands for loading files within the session are also available:
#
# +source+::
#   Loads a given file in the current session and displays the source lines,
#   see IrbLoader#source_file
# +irb_load+::
#   Loads the given file similarly to Kernel#load, see IrbLoader#irb_load
# +irb_require+::
#   Loads the given file similarly to Kernel#require
#
# === Configuration
#
# The command line options, or IRB.conf, specify the default behavior of
# Irb.irb.
#
# On the other hand, each conf in IRB@Command+line+options is used to
# individually configure IRB.irb.
#
# If a proc is set for IRB.conf[:IRB_RC], its will be invoked after execution
# of that proc with the context of the current session as its argument. Each
# session can be configured using this mechanism.
#
# === Session variables
#
# There are a few variables in every Irb session that can come in handy:
#
# <code>_</code>::
#   The value command executed, as a local variable
# <code>__</code>::
#   The history of evaluated commands
# <code>__[line_no]</code>::
#   Returns the evaluation value at the given line number, +line_no+.
#   If +line_no+ is a negative, the return value +line_no+ many lines before
#   the most recent return value.
#
# === Example using IRB Sessions
#
#   # invoke a new session
#   irb(main):001:0> irb
#   # list open sessions
#   irb.1(main):001:0> jobs
#     #0->irb on main (#<Thread:0x400fb7e4> : stop)
#     #1->irb#1 on main (#<Thread:0x40125d64> : running)
#
#   # change the active session
#   irb.1(main):002:0> fg 0
#   # define class Foo in top-level session
#   irb(main):002:0> class Foo;end
#   # invoke a new session with the context of Foo
#   irb(main):003:0> irb Foo
#   # define Foo#foo
#   irb.2(Foo):001:0> def foo
#   irb.2(Foo):002:1>   print 1
#   irb.2(Foo):003:1> end
#
#   # change the active session
#   irb.2(Foo):004:0> fg 0
#   # list open sessions
#   irb(main):004:0> jobs
#     #0->irb on main (#<Thread:0x400fb7e4> : running)
#     #1->irb#1 on main (#<Thread:0x40125d64> : stop)
#     #2->irb#2 on Foo (#<Thread:0x4011d54c> : stop)
#   # check if Foo#foo is available
#   irb(main):005:0> Foo.instance_methods #=> [:foo, ...]
#
#   # change the active sesssion
#   irb(main):006:0> fg 2
#   # define Foo#bar in the context of Foo
#   irb.2(Foo):005:0> def bar
#   irb.2(Foo):006:1>  print "bar"
#   irb.2(Foo):007:1> end
#   irb.2(Foo):010:0>  Foo.instance_methods #=> [:bar, :foo, ...]
#
#   # change the active session
#   irb.2(Foo):011:0> fg 0
#   irb(main):007:0> f = Foo.new  #=> #<Foo:0x4010af3c>
#   # invoke a new session with the context of f (instance of Foo)
#   irb(main):008:0> irb f
#   # list open sessions
#   irb.3(<Foo:0x4010af3c>):001:0> jobs
#     #0->irb on main (#<Thread:0x400fb7e4> : stop)
#     #1->irb#1 on main (#<Thread:0x40125d64> : stop)
#     #2->irb#2 on Foo (#<Thread:0x4011d54c> : stop)
#     #3->irb#3 on #<Foo:0x4010af3c> (#<Thread:0x4010a1e0> : running)
#   # evaluate f.foo
#   irb.3(<Foo:0x4010af3c>):002:0> foo #=> 1 => nil
#   # evaluate f.bar
#   irb.3(<Foo:0x4010af3c>):003:0> bar #=> bar => nil
#   # kill jobs 1, 2, and 3
#   irb.3(<Foo:0x4010af3c>):004:0> kill 1, 2, 3
#   # list open sessions, should only include main session
#   irb(main):009:0> jobs
#     #0->irb on main (#<Thread:0x400fb7e4> : running)
#   # quit irb
#   irb(main):010:0> exit
module IRB

  # An exception raised by IRB.irb_abort
  class Abort < Exception;end

  @CONF = {}


  # Displays current configuration.
  #
  # Modifying the configuration is achieved by sending a message to IRB.conf.
  #
  # See IRB@Configuration for more information.
  def IRB.conf
    @CONF
  end

  # Returns the current version of IRB, including release version and last
  # updated date.
  def IRB.version
    if v = @CONF[:VERSION] then return v end

    @CONF[:VERSION] = format("irb %s (%s)", @RELEASE_VERSION, @LAST_UPDATE_DATE)
  end

  # The current IRB::Context of the session, see IRB.conf
  #
  #   irb
  #   irb(main):001:0> IRB.CurrentContext.irb_name = "foo"
  #   foo(main):002:0> IRB.conf[:MAIN_CONTEXT].irb_name #=> "foo"
  def IRB.CurrentContext
    IRB.conf[:MAIN_CONTEXT]
  end

  # Initializes IRB and creates a new Irb.irb object at the +TOPLEVEL_BINDING+
  def IRB.start(ap_path = nil)
    STDOUT.sync = true
    $0 = File::basename(ap_path, ".rb") if ap_path

    IRB.setup(ap_path)

    if @CONF[:SCRIPT]
      irb = Irb.new(nil, @CONF[:SCRIPT])
    else
      irb = Irb.new
    end
    irb.run(@CONF)
  end

  # Calls each event hook of IRB.conf[:AT_EXIT] when the current session quits.
  def IRB.irb_at_exit
    @CONF[:AT_EXIT].each{|hook| hook.call}
  end

  # Quits irb
  def IRB.irb_exit(irb, ret)
    throw :IRB_EXIT, ret
  end

  # Aborts then interrupts irb.
  #
  # Will raise an Abort exception, or the given +exception+.
  def IRB.irb_abort(irb, exception = Abort)
    if defined? Thread
      irb.context.thread.raise exception, "abort then interrupt!"
    else
      raise exception, "abort then interrupt!"
    end
  end

  class Irb
    # Creates a new irb session
    def initialize(workspace = nil, input_method = nil, output_method = nil)
      @context = Context.new(self, workspace, input_method, output_method)
      @context.main.extend ExtendCommandBundle
      @signal_status = :IN_IRB

      @scanner = RubyLex.new
      @scanner.exception_on_syntax_error = false
    end

    def run(conf = IRB.conf)
      conf[:IRB_RC].call(context) if conf[:IRB_RC]
      conf[:MAIN_CONTEXT] = context

      trap("SIGINT") do
        signal_handle
      end

      begin
        catch(:IRB_EXIT) do
          eval_input
        end
      ensure
        conf[:AT_EXIT].each{|hook| hook.call}
      end
    end

    # Returns the current context of this irb session
    attr_reader :context
    # The lexer used by this irb session
    attr_accessor :scanner

    # Evaluates input for this session.
    def eval_input
      exc = nil

      @scanner.set_prompt do
        |ltype, indent, continue, line_no|
        if ltype
          f = @context.prompt_s
        elsif continue
          f = @context.prompt_c
        elsif indent > 0
          f = @context.prompt_n
        else
          f = @context.prompt_i
        end
        f = "" unless f
        if @context.prompting?
          @context.io.prompt = p = prompt(f, ltype, indent, line_no)
        else
          @context.io.prompt = p = ""
        end
        if @context.auto_indent_mode
          unless ltype
            ind = prompt(@context.prompt_i, ltype, indent, line_no)[/.*\z/].size +
              indent * 2 - p.size
            ind += 2 if continue
            @context.io.prompt = p + " " * ind if ind > 0
          end
        end
      end

      @scanner.set_input(@context.io) do
        signal_status(:IN_INPUT) do
          if l = @context.io.gets
            print l if @context.verbose?
          else
            if @context.ignore_eof? and @context.io.readable_after_eof?
              l = "\n"
              if @context.verbose?
                printf "Use \"exit\" to leave %s\n", @context.ap_name
              end
            else
              print "\n"
            end
          end
          l
        end
      end

      @scanner.each_top_level_statement do |line, line_no|
        signal_status(:IN_EVAL) do
          begin
            line.untaint
            @context.evaluate(line, line_no, exception: exc)
            output_value if @context.echo?
          rescue Interrupt => exc
          rescue SystemExit, SignalException
            raise
          rescue Exception => exc
          else
            exc = nil
            next
          end
          handle_exception(exc)
        end
      end
    end

    def handle_exception(exc)
      if exc.backtrace && exc.backtrace[0] =~ /irb(2)?(\/.*|-.*|\.rb)?:/ && exc.class.to_s !~ /^IRB/ &&
         !(SyntaxError === exc)
        irb_bug = true
      else
        irb_bug = false
      end

      if STDOUT.tty?
        attr = ATTR_TTY
        print "#{attr[1]}Traceback#{attr[]} (most recent call last):\n"
      else
        attr = ATTR_PLAIN
      end
      messages = []
      lasts = []
      levels = 0
      if exc.backtrace
        count = 0
        exc.backtrace.each do |m|
          m = @context.workspace.filter_backtrace(m) or next unless irb_bug
          count += 1
          if attr == ATTR_TTY
            m = sprintf("%9d: from %s", count, m)
          else
            m = "\tfrom #{m}"
          end
          if messages.size < @context.back_trace_limit
            messages.push(m)
          elsif lasts.size < @context.back_trace_limit
            lasts.push(m).shift
            levels += 1
          end
        end
      end
      if attr == ATTR_TTY
        unless lasts.empty?
          puts lasts.reverse
          printf "... %d levels...\n", levels if levels > 0
        end
        puts messages.reverse
      end
      m = exc.to_s.split(/\n/)
      print "#{attr[1]}#{exc.class} (#{attr[4]}#{m.shift}#{attr[0, 1]})#{attr[]}\n"
      puts m.map {|s| "#{attr[1]}#{s}#{attr[]}\n"}
      if attr == ATTR_PLAIN
        puts messages
        unless lasts.empty?
          puts lasts
          printf "... %d levels...\n", levels if levels > 0
        end
      end
      print "Maybe IRB bug!\n" if irb_bug
    end

    # Evaluates the given block using the given +path+ as the Context#irb_path
    # and +name+ as the Context#irb_name.
    #
    # Used by the irb command +source+, see IRB@IRB+Sessions for more
    # information.
    def suspend_name(path = nil, name = nil)
      @context.irb_path, back_path = path, @context.irb_path if path
      @context.irb_name, back_name = name, @context.irb_name if name
      begin
        yield back_path, back_name
      ensure
        @context.irb_path = back_path if path
        @context.irb_name = back_name if name
      end
    end

    # Evaluates the given block using the given +workspace+ as the
    # Context#workspace.
    #
    # Used by the irb command +irb_load+, see IRB@IRB+Sessions for more
    # information.
    def suspend_workspace(workspace)
      @context.workspace, back_workspace = workspace, @context.workspace
      begin
        yield back_workspace
      ensure
        @context.workspace = back_workspace
      end
    end

    # Evaluates the given block using the given +input_method+ as the
    # Context#io.
    #
    # Used by the irb commands +source+ and +irb_load+, see IRB@IRB+Sessions
    # for more information.
    def suspend_input_method(input_method)
      back_io = @context.io
      @context.instance_eval{@io = input_method}
      begin
        yield back_io
      ensure
        @context.instance_eval{@io = back_io}
      end
    end

    # Evaluates the given block using the given +context+ as the Context.
    def suspend_context(context)
      @context, back_context = context, @context
      begin
        yield back_context
      ensure
        @context = back_context
      end
    end

    # Handler for the signal SIGINT, see Kernel#trap for more information.
    def signal_handle
      unless @context.ignore_sigint?
        print "\nabort!\n" if @context.verbose?
        exit
      end

      case @signal_status
      when :IN_INPUT
        print "^C\n"
        raise RubyLex::TerminateLineInput
      when :IN_EVAL
        IRB.irb_abort(self)
      when :IN_LOAD
        IRB.irb_abort(self, LoadAbort)
      when :IN_IRB
        # ignore
      else
        # ignore other cases as well
      end
    end

    # Evaluates the given block using the given +status+.
    def signal_status(status)
      return yield if @signal_status == :IN_LOAD

      signal_status_back = @signal_status
      @signal_status = status
      begin
        yield
      ensure
        @signal_status = signal_status_back
      end
    end

    def prompt(prompt, ltype, indent, line_no) # :nodoc:
      p = prompt.dup
      p.gsub!(/%([0-9]+)?([a-zA-Z])/) do
        case $2
        when "N"
          @context.irb_name
        when "m"
          @context.main.to_s
        when "M"
          @context.main.inspect
        when "l"
          ltype
        when "i"
          if $1
            format("%" + $1 + "d", indent)
          else
            indent.to_s
          end
        when "n"
          if $1
            format("%" + $1 + "d", line_no)
          else
            line_no.to_s
          end
        when "%"
          "%"
        end
      end
      p
    end

    def output_value # :nodoc:
      printf @context.return_format, @context.inspect_last_value
    end

    # Outputs the local variables to this current session, including
    # #signal_status and #context, using IRB::Locale.
    def inspect
      ary = []
      for iv in instance_variables
        case (iv = iv.to_s)
        when "@signal_status"
          ary.push format("%s=:%s", iv, @signal_status.id2name)
        when "@context"
          ary.push format("%s=%s", iv, eval(iv).__to_s__)
        else
          ary.push format("%s=%s", iv, eval(iv))
        end
      end
      format("#<%s: %s>", self.class, ary.join(", "))
    end

    ATTR_TTY = "\e[%sm"
    def ATTR_TTY.[](*a) self % a.join(";"); end
    ATTR_PLAIN = ""
    def ATTR_PLAIN.[](*) self; end
  end

  def @CONF.inspect
    IRB.version unless self[:VERSION]

    array = []
    for k, v in sort{|a1, a2| a1[0].id2name <=> a2[0].id2name}
      case k
      when :MAIN_CONTEXT, :__TMP__EHV__
        array.push format("CONF[:%s]=...myself...", k.id2name)
      when :PROMPT
        s = v.collect{
          |kk, vv|
          ss = vv.collect{|kkk, vvv| ":#{kkk.id2name}=>#{vvv.inspect}"}
          format(":%s=>{%s}", kk.id2name, ss.join(", "))
        }
        array.push format("CONF[:%s]={%s}", k.id2name, s.join(", "))
      else
        array.push format("CONF[:%s]=%s", k.id2name, v.inspect)
      end
    end
    array.join("\n")
  end
end

class Binding
  # Opens an IRB session where +binding.irb+ is called which allows for
  # interactive debugging. You can call any methods or variables available in
  # the current scope, and mutate state if you need to.
  #
  #
  # Given a Ruby file called +potato.rb+ containing the following code:
  #
  #     class Potato
  #       def initialize
  #         @cooked = false
  #         binding.irb
  #         puts "Cooked potato: #{@cooked}"
  #       end
  #     end
  #
  #     Potato.new
  #
  # Running +ruby potato.rb+ will open an IRB session where +binding.irb+ is
  # called, and you will see the following:
  #
  #     $ ruby potato.rb
  #
  #     From: potato.rb @ line 4 :
  #
  #         1: class Potato
  #         2:   def initialize
  #         3:     @cooked = false
  #      => 4:     binding.irb
  #         5:     puts "Cooked potato: #{@cooked}"
  #         6:   end
  #         7: end
  #         8:
  #         9: Potato.new
  #
  #     irb(#<Potato:0x00007feea1916670>):001:0>
  #
  # You can type any valid Ruby code and it will be evaluated in the current
  # context. This allows you to debug without having to run your code repeatedly:
  #
  #     irb(#<Potato:0x00007feea1916670>):001:0> @cooked
  #     => false
  #     irb(#<Potato:0x00007feea1916670>):002:0> self.class
  #     => Potato
  #     irb(#<Potato:0x00007feea1916670>):003:0> caller.first
  #     => ".../2.5.1/lib/ruby/2.5.0/irb/workspace.rb:85:in `eval'"
  #     irb(#<Potato:0x00007feea1916670>):004:0> @cooked = true
  #     => true
  #
  # You can exit the IRB session with the `exit` command. Note that exiting will
  # resume execution where +binding.irb+ had paused it, as you can see from the
  # output printed to standard output in this example:
  #
  #     irb(#<Potato:0x00007feea1916670>):005:0> exit
  #     Cooked potato: true
  #
  #
  # See IRB@IRB+Usage for more information.
  def irb
    IRB.setup(eval("__FILE__"), argv: [])
    workspace = IRB::WorkSpace.new(self)
    STDOUT.print(workspace.code_around_binding)
    IRB::Irb.new(workspace).run(IRB.conf)
  end
end

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