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Editing: irb.rb

#
#   irb.rb - irb main module
#       $Release Version: 0.9.6 $
#       $Revision: 31641 $
#       by Keiju ISHITSUKA(keiju@ruby-lang.org)
#
# --
#
#
#
require "e2mmap"

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

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

STDOUT.sync = true

module IRB
  @RCS_ID='-$Id: irb.rb 31641 2011-05-19 00:07:25Z nobu $-'

class Abort < Exception;end

#
  @CONF = {}

def IRB.conf
    @CONF
  end

# IRB version method
  def IRB.version
    if v = @CONF[:VERSION] then return v end

require "irb/version"
    rv = @RELEASE_VERSION.sub(/\.0/, "")
    @CONF[:VERSION] = format("irb %s(%s)", rv, @LAST_UPDATE_DATE)
  end

def IRB.CurrentContext
    IRB.conf[:MAIN_CONTEXT]
  end

# initialize IRB and start TOP_LEVEL irb
  def IRB.start(ap_path = nil)
    $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

@CONF[:IRB_RC].call(irb.context) if @CONF[:IRB_RC]
    @CONF[:MAIN_CONTEXT] = irb.context

trap("SIGINT") do
      irb.signal_handle
    end

begin
      catch(:IRB_EXIT) do
        irb.eval_input
      end
    ensure
      irb_at_exit
    end
#    print "\n"
  end

def IRB.irb_at_exit
    @CONF[:AT_EXIT].each{|hook| hook.call}
  end

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

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

#
  # irb interpreter main routine
  #
  class Irb
    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
    attr_reader :context
    attr_accessor :scanner

def eval_input
      @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_atfer_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)
            output_value if @context.echo?
            exc = nil
          rescue Interrupt => exc
          rescue SystemExit, SignalException
            raise
          rescue Exception => exc
          end
          if exc
            print exc.class, ": ", exc, "\n"
            if exc.backtrace[0] =~ /irb(2)?(\/.*|-.*|\.rb)?:/ && exc.class.to_s !~ /^IRB/ &&
                !(SyntaxError === exc)
              irb_bug = true
            else
              irb_bug = false
            end

messages = []
            lasts = []
            levels = 0
            for m in exc.backtrace
              m = @context.workspace.filter_backtrace(m) unless irb_bug
              if m
                if messages.size < @context.back_trace_limit
                  messages.push "\tfrom "+m
                else
                  lasts.push "\tfrom "+m
                  if lasts.size > @context.back_trace_limit
                    lasts.shift
                    levels += 1
                  end
                end
              end
            end
            print messages.join("\n"), "\n"
            unless lasts.empty?
              printf "... %d levels...\n", levels if levels > 0
              print lasts.join("\n")
            end
            print "Maybe IRB bug!\n" if irb_bug
          end
          if $SAFE > 2
            abort "Error: irb does not work for $SAFE level higher than 2"
          end
        end
      end
    end

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

def suspend_workspace(workspace)
      @context.workspace, back_workspace = workspace, @context.workspace
      begin
        yield back_workspace
      ensure
        @context.workspace = back_workspace
      end
    end

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

def suspend_context(context)
      @context, back_context = context, @context
      begin
        yield back_context
      ensure
        @context = back_context
      end
    end

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

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)
      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
      printf @context.return_format, @context.inspect_last_value
    end

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
  end

# Singleton method
  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

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Editing: irb.rb

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