This file is indexed.

/usr/lib/ruby/1.8/irb/context.rb is in libruby1.8 1.8.7.352-2ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
#
#   irb/context.rb - irb context
#   	$Release Version: 0.9.5$
#   	$Revision: 11708 $
#   	$Date: 2007-02-13 08:01:19 +0900 (Tue, 13 Feb 2007) $
#   	by Keiju ISHITSUKA(keiju@ruby-lang.org)
#
# --
#
#   
#
require "irb/workspace"

module IRB
  class Context
    #
    # Arguments:
    #   input_method: nil -- stdin or readline
    #		      String -- File
    #		      other -- using this as InputMethod
    #
    def initialize(irb, workspace = nil, input_method = nil, output_method = nil)
      @irb = irb
      if workspace
	@workspace = workspace
      else
	@workspace = WorkSpace.new
      end
      @thread = Thread.current if defined? Thread
#      @irb_level = 0

      # copy of default configuration
      @ap_name = IRB.conf[:AP_NAME]
      @rc = IRB.conf[:RC]
      @load_modules = IRB.conf[:LOAD_MODULES]

      @use_readline = IRB.conf[:USE_READLINE]
      @inspect_mode = IRB.conf[:INSPECT_MODE]

      self.math_mode = IRB.conf[:MATH_MODE] if IRB.conf[:MATH_MODE]
      self.use_tracer = IRB.conf[:USE_TRACER] if IRB.conf[:USE_TRACER]
      self.use_loader = IRB.conf[:USE_LOADER] if IRB.conf[:USE_LOADER]
      self.eval_history = IRB.conf[:EVAL_HISTORY] if IRB.conf[:EVAL_HISTORY]

      @ignore_sigint = IRB.conf[:IGNORE_SIGINT]
      @ignore_eof = IRB.conf[:IGNORE_EOF]

      @back_trace_limit = IRB.conf[:BACK_TRACE_LIMIT]
      
      self.prompt_mode = IRB.conf[:PROMPT_MODE]

      if IRB.conf[:SINGLE_IRB] or !defined?(JobManager)
	@irb_name = IRB.conf[:IRB_NAME]
      else
	@irb_name = "irb#"+IRB.JobManager.n_jobs.to_s
      end
      @irb_path = "(" + @irb_name + ")"

      case input_method
      when nil
	case use_readline?
	when nil
	  if (defined?(ReadlineInputMethod) && STDIN.tty? &&
	      IRB.conf[:PROMPT_MODE] != :INF_RUBY)
	    @io = ReadlineInputMethod.new
	  else
	    @io = StdioInputMethod.new
	  end
	when false
	  @io = StdioInputMethod.new
	when true
	  if defined?(ReadlineInputMethod)
	    @io = ReadlineInputMethod.new
	  else
	    @io = StdioInputMethod.new
	  end
	end

      when String
	@io = FileInputMethod.new(input_method)
	@irb_name = File.basename(input_method)
	@irb_path = input_method
      else
	@io = input_method
      end
      self.save_history = IRB.conf[:SAVE_HISTORY] if IRB.conf[:SAVE_HISTORY]

      if output_method
	@output_method = output_method
      else
	@output_method = StdioOutputMethod.new
      end

      @verbose = IRB.conf[:VERBOSE] 
      @echo = IRB.conf[:ECHO]
      if @echo.nil?
	@echo = true
      end
      @debug_level = IRB.conf[:DEBUG_LEVEL]
    end

    def main
      @workspace.main
    end

    attr_reader :workspace_home
    attr_accessor :workspace
    attr_reader :thread
    attr_accessor :io
    
    attr_accessor :irb
    attr_accessor :ap_name
    attr_accessor :rc
    attr_accessor :load_modules
    attr_accessor :irb_name
    attr_accessor :irb_path

    attr_reader :use_readline
    attr_reader :inspect_mode

    attr_reader :prompt_mode
    attr_accessor :prompt_i
    attr_accessor :prompt_s
    attr_accessor :prompt_c
    attr_accessor :prompt_n
    attr_accessor :auto_indent_mode
    attr_accessor :return_format

    attr_accessor :ignore_sigint
    attr_accessor :ignore_eof
    attr_accessor :echo
    attr_accessor :verbose
    attr_reader :debug_level

    attr_accessor :back_trace_limit

    alias use_readline? use_readline
    alias rc? rc
    alias ignore_sigint? ignore_sigint
    alias ignore_eof? ignore_eof
    alias echo? echo

    def verbose?
      if @verbose.nil?
	if defined?(ReadlineInputMethod) && @io.kind_of?(ReadlineInputMethod) 
	  false
	elsif !STDIN.tty? or @io.kind_of?(FileInputMethod)
	  true
	else
	  false
	end
      end
    end

    def prompting?
      verbose? || (STDIN.tty? && @io.kind_of?(StdioInputMethod) ||
		(defined?(ReadlineInputMethod) && @io.kind_of?(ReadlineInputMethod)))
    end

    attr_reader :last_value

    def set_last_value(value)
      @last_value = value
      @workspace.evaluate self, "_ = IRB.CurrentContext.last_value"
    end

    attr_reader :irb_name

    def prompt_mode=(mode)
      @prompt_mode = mode
      pconf = IRB.conf[:PROMPT][mode]
      @prompt_i = pconf[:PROMPT_I]
      @prompt_s = pconf[:PROMPT_S]
      @prompt_c = pconf[:PROMPT_C]
      @prompt_n = pconf[:PROMPT_N]
      @return_format = pconf[:RETURN]
      if ai = pconf.include?(:AUTO_INDENT)
	@auto_indent_mode = ai
      else
	@auto_indent_mode = IRB.conf[:AUTO_INDENT]
      end
    end
    
    def inspect?
      @inspect_mode.nil? or @inspect_mode
    end

    def file_input?
      @io.class == FileInputMethod
    end

    def inspect_mode=(opt)
      if opt
	@inspect_mode = opt
      else
	@inspect_mode = !@inspect_mode
      end
      print "Switch to#{unless @inspect_mode; ' non';end} inspect mode.\n" if verbose?
      @inspect_mode
    end

    def use_readline=(opt)
      @use_readline = opt
      print "use readline module\n" if @use_readline
    end

    def debug_level=(value)
      @debug_level = value
      RubyLex.debug_level = value
      SLex.debug_level = value
    end

    def debug?
      @debug_level > 0
    end

    def evaluate(line, line_no)
      @line_no = line_no
      set_last_value(@workspace.evaluate(self, line, irb_path, line_no))
#      @workspace.evaluate("_ = IRB.conf[:MAIN_CONTEXT]._")
#      @_ = @workspace.evaluate(line, irb_path, line_no)
    end

    alias __exit__ exit
    def exit(ret = 0)
      IRB.irb_exit(@irb, ret)
    end

    NOPRINTING_IVARS = ["@last_value"]
    NO_INSPECTING_IVARS = ["@irb", "@io"]
    IDNAME_IVARS = ["@prompt_mode"]

    alias __inspect__ inspect
    def inspect
      array = []
      for ivar in instance_variables.sort{|e1, e2| e1 <=> e2}
	name = ivar.sub(/^@(.*)$/){$1}
	val = instance_eval(ivar)
	case ivar
	when *NOPRINTING_IVARS
	  array.push format("conf.%s=%s", name, "...")
	when *NO_INSPECTING_IVARS
	  array.push format("conf.%s=%s", name, val.to_s)
	when *IDNAME_IVARS
	  array.push format("conf.%s=:%s", name, val.id2name)
	else
	  array.push format("conf.%s=%s", name, val.inspect)
	end
      end
      array.join("\n")
    end
    alias __to_s__ to_s
    alias to_s inspect
  end
end