Class: IRB::Context

Inherits:
Object show all
Defined in:
lib/irb/context.rb,
lib/irb/ext/tracer.rb,
lib/irb/ext/history.rb,
lib/irb/ext/change-ws.rb,
lib/irb/ext/use-loader.rb,
lib/irb/ext/workspaces.rb,
lib/irb/ext/save-history.rb

Overview

:nodoc:

Constant Summary collapse

NOPRINTING_IVARS =

:nodoc:

["@last_value"]
NO_INSPECTING_IVARS =

:nodoc:

["@irb", "@io"]
IDNAME_IVARS =

:nodoc:

["@prompt_mode"]

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(irb, workspace = nil, input_method = nil) ⇒ Context

Creates a new IRB context.

The optional input_method argument:

nil

uses stdin or Reline or Readline

String

uses a File

other

uses this as InputMethod



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# File 'lib/irb/context.rb', line 28

def initialize(irb, workspace = nil, input_method = nil)
  @irb = irb
  if workspace
    @workspace = workspace
  else
    @workspace = WorkSpace.new
  end
  @thread = Thread.current

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

  if IRB.conf.has_key?(:USE_SINGLELINE)
    @use_singleline = IRB.conf[:USE_SINGLELINE]
  elsif IRB.conf.has_key?(:USE_READLINE) # backward compatibility
    @use_singleline = IRB.conf[:USE_READLINE]
  else
    @use_singleline = nil
  end
  if IRB.conf.has_key?(:USE_MULTILINE)
    @use_multiline = IRB.conf[:USE_MULTILINE]
  elsif IRB.conf.has_key?(:USE_RELINE) # backward compatibility
    warn <<~MSG.strip
      USE_RELINE is deprecated, please use USE_MULTILINE instead.
    MSG
    @use_multiline = IRB.conf[:USE_RELINE]
  elsif IRB.conf.has_key?(:USE_REIDLINE)
    warn <<~MSG.strip
      USE_REIDLINE is deprecated, please use USE_MULTILINE instead.
    MSG
    @use_multiline = IRB.conf[:USE_REIDLINE]
  else
    @use_multiline = nil
  end
  @use_autocomplete = IRB.conf[:USE_AUTOCOMPLETE]
  @verbose = IRB.conf[:VERBOSE]
  @io = nil

  self.inspect_mode = IRB.conf[:INSPECT_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?(IRB::JobManager)
    @irb_name = IRB.conf[:IRB_NAME]
  else
    @irb_name = IRB.conf[:IRB_NAME]+"#"+IRB.JobManager.n_jobs.to_s
  end
  @irb_path = "(" + @irb_name + ")"

  case input_method
  when nil
    @io = nil
    case use_multiline?
    when nil
      if STDIN.tty? && IRB.conf[:PROMPT_MODE] != :INF_RUBY && !use_singleline?
        # Both of multiline mode and singleline mode aren't specified.
        @io = RelineInputMethod.new
      else
        @io = nil
      end
    when false
      @io = nil
    when true
      @io = RelineInputMethod.new
    end
    unless @io
      case use_singleline?
      when nil
        if (defined?(ReadlineInputMethod) && STDIN.tty? &&
            IRB.conf[:PROMPT_MODE] != :INF_RUBY)
          @io = ReadlineInputMethod.new
        else
          @io = nil
        end
      when false
        @io = nil
      when true
        if defined?(ReadlineInputMethod)
          @io = ReadlineInputMethod.new
        else
          @io = nil
        end
      else
        @io = nil
      end
    end
    @io = StdioInputMethod.new unless @io

  when '-'
    @io = FileInputMethod.new($stdin)
    @irb_name = '-'
    @irb_path = '-'
  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]

  @extra_doc_dirs = IRB.conf[:EXTRA_DOC_DIRS]

  @echo = IRB.conf[:ECHO]
  if @echo.nil?
    @echo = true
  end

  @echo_on_assignment = IRB.conf[:ECHO_ON_ASSIGNMENT]
  if @echo_on_assignment.nil?
    @echo_on_assignment = :truncate
  end

  @newline_before_multiline_output = IRB.conf[:NEWLINE_BEFORE_MULTILINE_OUTPUT]
  if @newline_before_multiline_output.nil?
    @newline_before_multiline_output = true
  end

  @command_aliases = IRB.conf[:COMMAND_ALIASES]
end

Instance Attribute Details

#ap_name ⇒ Object

A copy of the default IRB.conf[:AP_NAME]



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# File 'lib/irb/context.rb', line 180

def ap_name
  @ap_name
end

#auto_indent_mode ⇒ Object

Can be either the default IRB.conf[:AUTO_INDENT], or the mode set by #prompt_mode=

To disable auto-indentation in irb:

IRB.conf[:AUTO_INDENT] = false

or

irb_context.auto_indent_mode = false

or

IRB.CurrentContext.auto_indent_mode = false

See IRB@Configuration for more information.



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# File 'lib/irb/context.rb', line 239

def auto_indent_mode
  @auto_indent_mode
end

#back_trace_limit ⇒ Object

The limit of backtrace lines displayed as top n and tail n.

The default value is 16.

Can also be set using the --back-trace-limit command line option.

See IRB@Command+line+options for more command line options.



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# File 'lib/irb/context.rb', line 332

def back_trace_limit
  @back_trace_limit
end

#command_aliases ⇒ Object

User-defined IRB command aliases



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# File 'lib/irb/context.rb', line 335

def command_aliases
  @command_aliases
end

#echo ⇒ Object Also known as: echo?

Whether to echo the return value to output or not.

Uses IRB.conf[:ECHO] if available, or defaults to true.

puts "hello"
# hello
#=> nil
IRB.CurrentContext.echo = false
puts "omg"
# omg



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# File 'lib/irb/context.rb', line 270

def echo
  @echo
end

#echo_on_assignment ⇒ Object Also known as: echo_on_assignment?

Whether to echo for assignment expressions.

If set to false, the value of assignment will not be shown.

If set to true, the value of assignment will be shown.

If set to :truncate, the value of assignment will be shown and truncated.

It defaults to :truncate.

a = "omg"
#=> omg

a = "omg" * 10
#=> omgomgomgomgomgomgomg...

IRB.CurrentContext.echo_on_assignment = false
a = "omg"

IRB.CurrentContext.echo_on_assignment = true
a = "omg" * 10
#=> omgomgomgomgomgomgomgomgomgomg

To set the behaviour of showing on assignment in irb:

IRB.conf[:ECHO_ON_ASSIGNMENT] = :truncate or true or false

or

irb_context.echo_on_assignment = :truncate or true or false

or

IRB.CurrentContext.echo_on_assignment = :truncate or true or false



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# File 'lib/irb/context.rb', line 305

def echo_on_assignment
  @echo_on_assignment
end

#eval_history ⇒ Object

The command result history limit. This method is not available until #eval_history= was called with non-nil value (directly or via setting IRB.conf[:EVAL_HISTORY] in .irbrc).



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# File 'lib/irb/ext/history.rb', line 37

def eval_history
  @eval_history
end

#extra_doc_dirs ⇒ Object

Specify the installation locations of the ri file to be displayed in the document dialog.



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# File 'lib/irb/context.rb', line 259

def extra_doc_dirs
  @extra_doc_dirs
end

#ignore_eof ⇒ Object Also known as: ignore_eof?

Whether ^D (control-d) will be ignored or not.

If set to false, ^D will quit irb.



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# File 'lib/irb/context.rb', line 256

def ignore_eof
  @ignore_eof
end

#ignore_sigint ⇒ Object Also known as: ignore_sigint?

Whether ^C (control-c) will be ignored or not.

If set to false, ^C will quit irb.

If set to true,

  • during input: cancel input then return to top level.

  • during execute: abandon current execution.



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# File 'lib/irb/context.rb', line 252

def ignore_sigint
  @ignore_sigint
end

#inspect_mode ⇒ Object

A copy of the default IRB.conf[:INSPECT_MODE]



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# File 'lib/irb/context.rb', line 205

def inspect_mode
  @inspect_mode
end

#io ⇒ Object

The current input method.

Can be either StdioInputMethod, ReadlineInputMethod, RelineInputMethod, FileInputMethod or other specified when the context is created. See ::new for more # information on input_method.



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# File 'lib/irb/context.rb', line 175

def io
  @io
end

#irb ⇒ Object

Current irb session.



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# File 'lib/irb/context.rb', line 178

def irb
  @irb
end

#irb_name ⇒ Object

Can be either name from IRB.conf[:IRB_NAME], or the number of the current job set by JobManager, such as irb#2



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# File 'lib/irb/context.rb', line 187

def irb_name
  @irb_name
end

#irb_path ⇒ Object

Can be either the #irb_name surrounded by parenthesis, or the input_method passed to Context.new



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# File 'lib/irb/context.rb', line 190

def irb_path
  @irb_path
end

#last_value ⇒ Object (readonly)

The return value of the last statement evaluated.



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# File 'lib/irb/context.rb', line 386

def last_value
  @last_value
end

#load_modules ⇒ Object

A copy of the default IRB.conf[:LOAD_MODULES]



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# File 'lib/irb/context.rb', line 184

def load_modules
  @load_modules
end

#newline_before_multiline_output ⇒ Object Also known as: newline_before_multiline_output?

Whether a newline is put before multiline output.

Uses IRB.conf[:NEWLINE_BEFORE_MULTILINE_OUTPUT] if available, or defaults to true.

"abc\ndef"
#=>
abc
def
IRB.CurrentContext.newline_before_multiline_output = false
"abc\ndef"
#=> abc
def



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# File 'lib/irb/context.rb', line 319

def newline_before_multiline_output
  @newline_before_multiline_output
end

#prompt_c ⇒ Object

IRB prompt for continuated statement. (e.g. immediately after an if)

See IRB@Customizing+the+IRB+Prompt for more information.



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# File 'lib/irb/context.rb', line 220

def prompt_c
  @prompt_c
end

#prompt_i ⇒ Object

Standard IRB prompt.

See IRB@Customizing+the+IRB+Prompt for more information.



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# File 'lib/irb/context.rb', line 212

def prompt_i
  @prompt_i
end

#prompt_mode ⇒ Object

A copy of the default IRB.conf[:PROMPT_MODE]



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# File 'lib/irb/context.rb', line 208

def prompt_mode
  @prompt_mode
end

#prompt_n ⇒ Object

See IRB@Customizing+the+IRB+Prompt for more information.



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# File 'lib/irb/context.rb', line 222

def prompt_n
  @prompt_n
end

#prompt_s ⇒ Object

IRB prompt for continuated strings.

See IRB@Customizing+the+IRB+Prompt for more information.



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# File 'lib/irb/context.rb', line 216

def prompt_s
  @prompt_s
end

#rc ⇒ Object Also known as: rc?

A copy of the default IRB.conf[:RC]



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# File 'lib/irb/context.rb', line 182

def rc
  @rc
end

#return_format ⇒ Object

The format of the return statement, set by #prompt_mode= using the :RETURN of the mode passed to set the current #prompt_mode.



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# File 'lib/irb/context.rb', line 242

def return_format
  @return_format
end

#thread ⇒ Object (readonly)

The current thread in this context.



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# File 'lib/irb/context.rb', line 169

def thread
  @thread
end

#use_autocomplete ⇒ Object (readonly) Also known as: use_autocomplete?

Whether colorization is enabled or not.

A copy of the default IRB.conf[:USE_AUTOCOMPLETE]



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# File 'lib/irb/context.rb', line 203

def use_autocomplete
  @use_autocomplete
end

#use_multiline ⇒ Object (readonly) Also known as: use_multiline?, use_reline, use_reline?

Whether multiline editor mode is enabled or not.

A copy of the default IRB.conf[:USE_MULTILINE]



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# File 'lib/irb/context.rb', line 195

def use_multiline
  @use_multiline
end

#use_singleline ⇒ Object (readonly) Also known as: use_singleline?, use_readline, use_readline?

Whether singleline editor mode is enabled or not.

A copy of the default IRB.conf[:USE_SINGLELINE]



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# File 'lib/irb/context.rb', line 199

def use_singleline
  @use_singleline
end

#use_tracer ⇒ Object Also known as: use_tracer?

Whether Tracer is used when evaluating statements in this context.

See lib/tracer.rb for more information.



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# File 'lib/irb/ext/tracer.rb', line 43

def use_tracer
  @use_tracer
end

#verbose ⇒ Object

Whether verbose messages are displayed or not.

A copy of the default IRB.conf[:VERBOSE]



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# File 'lib/irb/context.rb', line 323

def verbose
  @verbose
end

#workspace ⇒ Object

WorkSpace in the current context.



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# File 'lib/irb/context.rb', line 167

def workspace
  @workspace
end

#workspace_home ⇒ Object (readonly)

The toplevel workspace, see #home_workspace



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# File 'lib/irb/context.rb', line 165

def workspace_home
  @workspace_home
end

Instance Method Details

#__exit__ ⇒ Object 



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# File 'lib/irb/context.rb', line 509

alias __exit__ exit

#__inspect__ ⇒ Object 



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# File 'lib/irb/context.rb', line 521

alias __inspect__ inspect

#_set_last_value ⇒ Object

Sets the return value from the last statement evaluated in this context to #last_value. See #set_last_value



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# File 'lib/irb/ext/history.rb', line 20

def set_last_value(value)
  @last_value = value
  @workspace.local_variable_set :_, value
end

#change_workspace(*_main) ⇒ Object

Changes the current workspace to given object or binding.

If the optional argument is omitted, the workspace will be #home_workspace which is inherited from TOPLEVEL_BINDING or the main object, IRB.conf[:MAIN_CONTEXT] when irb was initialized.

See IRB::WorkSpace.new for more information.



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# File 'lib/irb/ext/change-ws.rb', line 32

def change_workspace(*_main)
  if _main.empty?
    @workspace = home_workspace
    return main
  end

  @workspace = WorkSpace.new(_main[0])

  if !(class<<main;ancestors;end).include?(ExtendCommandBundle)
    main.extend ExtendCommandBundle
  end
end

#evaluate(line, line_no, exception: nil) ⇒ Object

:nodoc:



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# File 'lib/irb/context.rb', line 481

def evaluate(line, line_no, exception: nil) # :nodoc:
  @line_no = line_no
  if exception
    line_no -= 1
    line = "begin ::Kernel.raise _; rescue _.class\n#{line}\n""end"
    @workspace.local_variable_set(:_, exception)
  end

  # Transform a non-identifier alias (@, $) or keywords (next, break)
  command, args = line.split(/\s/, 2)
  if original = command_aliases[command.to_sym]
    line = line.gsub(/\A#{Regexp.escape(command)}/, original.to_s)
    command = original
  end

  # Hook command-specific transformation
  command_class = ExtendCommandBundle.load_command(command)
  if command_class&.respond_to?(:transform_args)
    line = "#{command} #{command_class.transform_args(args)}"
  end

  set_last_value(@workspace.evaluate(self, line, irb_path, line_no))
end

#exit(ret = 0) ⇒ Object

Exits the current session, see IRB.irb_exit



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# File 'lib/irb/context.rb', line 511

def exit(ret = 0)
  IRB.irb_exit(@irb, ret)
rescue UncaughtThrowError
  super
end

#file_input? ⇒ Boolean

Whether #io uses a File for the input_method passed when creating the current context, see ::new

Returns:

  • (Boolean) 


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# File 'lib/irb/context.rb', line 421

def file_input?
  @io.class == FileInputMethod
end

#history_file ⇒ Object

A copy of the default IRB.conf[:HISTORY_FILE]



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# File 'lib/irb/ext/save-history.rb', line 48

def history_file
  IRB.conf[:HISTORY_FILE]
end

#history_file=(hist) ⇒ Object

Set IRB.conf[:HISTORY_FILE] to the given hist.



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# File 'lib/irb/ext/save-history.rb', line 53

def history_file=(hist)
  IRB.conf[:HISTORY_FILE] = hist
end

#home_workspace ⇒ Object

Inherited from TOPLEVEL_BINDING.



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# File 'lib/irb/ext/change-ws.rb', line 17

def home_workspace
  if defined? @home_workspace
    @home_workspace
  else
    @home_workspace = @workspace
  end
end

#init_save_history ⇒ Object

:nodoc:



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# File 'lib/irb/ext/save-history.rb', line 17

def init_save_history# :nodoc:
  unless (class<<@io;self;end).include?(HistorySavingAbility)
    @io.extend(HistorySavingAbility)
  end
end

#inspect ⇒ Object Also known as: to_s

:nodoc:



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# File 'lib/irb/context.rb', line 522

def inspect # :nodoc:
  array = []
  for ivar in instance_variables.sort{|e1, e2| e1 <=> e2}
    ivar = ivar.to_s
    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

#inspect? ⇒ Boolean

Whether #inspect_mode is set or not, see #inspect_mode= for more detail.

Returns:

  • (Boolean) 


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# File 'lib/irb/context.rb', line 415

def inspect?
  @inspect_mode.nil? or @inspect_mode
end

#inspect_last_value ⇒ Object

:nodoc:



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# File 'lib/irb/context.rb', line 505

def inspect_last_value # :nodoc:
  @inspect_method.inspect_value(@last_value)
end

#irb_level ⇒ Object

Size of the current WorkSpace stack



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# File 'lib/irb/ext/workspaces.rb', line 17

def irb_level
  workspace_stack.size
end

#local_variables ⇒ Object

:nodoc:



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# File 'lib/irb/context.rb', line 544

def local_variables # :nodoc:
  workspace.binding.local_variables
end

#main ⇒ Object

The top-level workspace, see WorkSpace#main



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# File 'lib/irb/context.rb', line 160

def main
  @workspace.main
end

#pop_workspace ⇒ Object

Removes the last element from the current #workspaces stack and returns it, or nil if the current workspace stack is empty.

Also, see #push_workspace.



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# File 'lib/irb/ext/workspaces.rb', line 58

def pop_workspace
  if workspaces.empty?
    print "workspace stack empty\n"
    return
  end
  @workspace = workspaces.pop
end

#prompting? ⇒ Boolean

Whether #verbose? is true, and input_method is either StdioInputMethod or RelineInputMethod or ReadlineInputMethod, see #io for more information.

Returns:

  • (Boolean) 


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# File 'lib/irb/context.rb', line 379

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

#push_workspace(*_main) ⇒ Object

Creates a new workspace with the given object or binding, and appends it onto the current #workspaces stack.

See IRB::Context#change_workspace and IRB::WorkSpace.new for more information.



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# File 'lib/irb/ext/workspaces.rb', line 35

def push_workspace(*_main)
  if _main.empty?
    if workspaces.empty?
      print "No other workspace\n"
      return nil
    end
    ws = workspaces.pop
    workspaces.push @workspace
    @workspace = ws
    return workspaces
  end

  workspaces.push @workspace
  @workspace = WorkSpace.new(@workspace.binding, _main[0])
  if !(class<<main;ancestors;end).include?(ExtendCommandBundle)
    main.extend ExtendCommandBundle
  end
end

#save_history ⇒ Object

A copy of the default IRB.conf[:SAVE_HISTORY]



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# File 'lib/irb/ext/save-history.rb', line 24

def save_history
  IRB.conf[:SAVE_HISTORY]
end

#save_history=(val) ⇒ Object

Sets IRB.conf[:SAVE_HISTORY] to the given val and calls #init_save_history with this context.

Will store the number of val entries of history in the #history_file

Add the following to your .irbrc to change the number of history entries stored to 1000:

IRB.conf[:SAVE_HISTORY] = 1000



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# File 'lib/irb/ext/save-history.rb', line 38

def save_history=(val)
  IRB.conf[:SAVE_HISTORY] = val
  if val
    main_context = IRB.conf[:MAIN_CONTEXT]
    main_context = self unless main_context
    main_context.init_save_history
  end
end

#set_last_value(value) ⇒ Object

Sets the return value from the last statement evaluated in this context to #last_value.



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# File 'lib/irb/context.rb', line 390

def set_last_value(value)
  @last_value = value
  @workspace.local_variable_set :_, value
end

#symbol_alias?(command) ⇒ Boolean

Return true if it’s aliased from the argument and it’s not an identifier.

Returns:

  • (Boolean) 


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# File 'lib/irb/context.rb', line 549

def symbol_alias?(command)
  return nil if command.match?(/\A\w+\z/)
  command_aliases.key?(command.to_sym)
end

#transform_args?(command) ⇒ Boolean

Return true if the command supports transforming args

Returns:

  • (Boolean) 


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# File 'lib/irb/context.rb', line 555

def transform_args?(command)
  command = command_aliases.fetch(command.to_sym, command)
  ExtendCommandBundle.load_command(command)&.respond_to?(:transform_args)
end

#use_loader ⇒ Object Also known as: use_loader?

Returns whether irb‘s own file reader method is used by load/require or not.

This mode is globally affected (irb-wide).



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# File 'lib/irb/ext/use-loader.rb', line 43

def use_loader
  IRB.conf[:USE_LOADER]
end

#use_loader=(opt) ⇒ Object

Sets IRB.conf[:USE_LOADER]

See #use_loader for more information.



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# File 'lib/irb/ext/use-loader.rb', line 53

def use_loader=(opt)

  if IRB.conf[:USE_LOADER] != opt
    IRB.conf[:USE_LOADER] = opt
    if opt
      if !$".include?("irb/cmd/load")
      end
      (class<<@workspace.main;self;end).instance_eval {
        alias_method :load, :irb_load
        alias_method :require, :irb_require
      }
    else
      (class<<@workspace.main;self;end).instance_eval {
        alias_method :load, :__original__load__IRB_use_loader__
        alias_method :require, :__original__require__IRB_use_loader__
      }
    end
  end
  print "Switch to load/require#{unless use_loader; ' non';end} trace mode.\n" if verbose?
  opt
end

#verbose? ⇒ Boolean

Returns whether messages are displayed or not.

Returns:

  • (Boolean) 


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# File 'lib/irb/context.rb', line 360

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

#workspaces ⇒ Object

WorkSpaces in the current stack



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# File 'lib/irb/ext/workspaces.rb', line 22

def workspaces
  if defined? @workspaces
    @workspaces
  else
    @workspaces = []
  end
end