Class: IRB::Context

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

Overview

:nodoc:

Constant Summary collapse

ASSIGN_OPERATORS_REGEXP = 
Regexp.union(%w[= += -= *= /= %= **= &= |= &&= ||= ^= <<= >>=])
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 24

def initialize(irb, workspace = nil, input_method = nil)
  @irb = irb
  @workspace_stack = []
  if workspace
    @workspace_stack << workspace
  else
    @workspace_stack << 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]
  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]

  @irb_name = IRB.conf[:IRB_NAME]

  unless IRB.conf[:SINGLE_IRB] or !defined?(IRB::JobManager)
    @irb_name = @irb_name + "#" + IRB.JobManager.n_jobs.to_s
  end

  self.irb_path = "(" + @irb_name + ")"

  case input_method
  when nil
    @io = nil
    case use_multiline?
    when nil
      if term_interactive? && IRB.conf[:PROMPT_MODE] != :INF_RUBY && !use_singleline?
        # Both of multiline mode and singleline mode aren't specified.
        @io = RelineInputMethod.new(build_completor)
      else
        @io = nil
      end
    when false
      @io = nil
    when true
      @io = RelineInputMethod.new(build_completor)
    end
    unless @io
      case use_singleline?
      when nil
        if (defined?(ReadlineInputMethod) && term_interactive? &&
            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 = '-'
    self.irb_path = '-'
  when String
    @io = FileInputMethod.new(input_method)
    @irb_name = File.basename(input_method)
    self.irb_path = input_method
  else
    @io = input_method
  end
  @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].dup
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 258

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 346

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.



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# File 'lib/irb/context.rb', line 437

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 440

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 377

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 412

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/eval_history.rb', line 31

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 366

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 363

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 359

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 301

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 253

def io
  @io
end

#irb ⇒ Object

Current irb session.



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

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 265

def irb_name
  @irb_name
end

#irb_path ⇒ Object

Can be one of the following:

  • the #irb_name surrounded by parenthesis

  • the input_method passed to Context.new

  • the file path of the current IRB context in a binding.irb session



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# File 'lib/irb/context.rb', line 271

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 491

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 262

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 426

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 Custom Prompts for more information.



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# File 'lib/irb/context.rb', line 316

def prompt_c
  @prompt_c
end

#prompt_i ⇒ Object

Standard IRB prompt.

See Custom Prompts for more information.



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# File 'lib/irb/context.rb', line 308

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 304

def prompt_mode
  @prompt_mode
end

#prompt_s ⇒ Object

IRB prompt for continuated strings.

See Custom Prompts for more information.



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# File 'lib/irb/context.rb', line 312

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 260

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 349

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 247

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 299

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 291

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 295

def use_singleline
  @use_singleline
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 430

def verbose
  @verbose
end

#with_debugger ⇒ Object

Returns the value of attribute with_debugger.



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# File 'lib/irb/context.rb', line 442

def with_debugger
  @with_debugger
end

#workspace_home ⇒ Object (readonly)

The toplevel workspace, see #home_workspace



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# File 'lib/irb/context.rb', line 245

def workspace_home
  @workspace_home
end

Instance Method Details

#__inspect__ ⇒ Object 



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# File 'lib/irb/context.rb', line 675

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/eval_history.rb', line 14

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 26

def change_workspace(*_main)
  if _main.empty?
    replace_workspace(home_workspace)
    return main
  end

  workspace = WorkSpace.new(_main[0])
  replace_workspace(workspace)
  workspace.load_helper_methods_to_main
end

#colorize_input(input, complete:) ⇒ Object 



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# File 'lib/irb/context.rb', line 652

def colorize_input(input, complete:)
  if IRB.conf[:USE_COLORIZE] && IRB::Color.colorable?
    lvars = local_variables || []
    if parse_command(input)
      name, sep, arg = input.split(/(\s+)/, 2)
      arg = IRB::Color.colorize_code(arg, complete: complete, local_variables: lvars)
      "#{IRB::Color.colorize(name, [:BOLD])}\e[m#{sep}#{arg}"
    else
      IRB::Color.colorize_code(input, complete: complete, local_variables: lvars)
    end
  else
    Reline::Unicode.escape_for_print(input)
  end
end

#evaluate(statement, line_no) ⇒ Object

:nodoc:



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# File 'lib/irb/context.rb', line 583

def evaluate(statement, line_no) # :nodoc:
  @line_no = line_no

  case statement
  when Statement::EmptyInput
    return
  when Statement::Expression
    result = evaluate_expression(statement.code, line_no)
    set_last_value(result)
  when Statement::Command
    statement.command_class.execute(self, statement.arg)
  end

  nil
end

#evaluate_expression(code, line_no) ⇒ Object

:nodoc:



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# File 'lib/irb/context.rb', line 603

def evaluate_expression(code, line_no) # :nodoc:
  result = nil
  if IRB.conf[:MEASURE] && IRB.conf[:MEASURE_CALLBACKS].empty?
    IRB.set_measure_callback
  end

  if IRB.conf[:MEASURE] && !IRB.conf[:MEASURE_CALLBACKS].empty?
    last_proc = proc do
      result = workspace.evaluate(code, @eval_path, line_no)
    end
    IRB.conf[:MEASURE_CALLBACKS].inject(last_proc) do |chain, item|
      _name, callback, arg = item
      proc do
        callback.(self, code, line_no, arg) do
          chain.call
        end
      end
    end.call
  else
    result = workspace.evaluate(code, @eval_path, line_no)
  end
  result
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 525

def file_input?
  @io.class == FileInputMethod
end

#from_binding? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/irb/context.rb', line 599

def from_binding?
  @irb.from_binding
end

#history_file ⇒ Object

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



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# File 'lib/irb/context.rb', line 219

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/context.rb', line 224

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 11

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

#inspect ⇒ Object Also known as: to_s

:nodoc:



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# File 'lib/irb/context.rb', line 676

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 519

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

#inspect_last_value ⇒ Object

:nodoc:



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# File 'lib/irb/context.rb', line 667

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

#local_variables ⇒ Object

:nodoc:



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# File 'lib/irb/context.rb', line 698

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 240

def main
  workspace.main
end

#parse_command(code) ⇒ Object 



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# File 'lib/irb/context.rb', line 627

def parse_command(code)
  command_name, arg = code.strip.split(/\s+/, 2)
  return unless code.lines.size == 1 && command_name

  arg ||= ''
  command = command_name.to_sym
  # Command aliases are always command. example: $, @
  if (alias_name = command_aliases[command])
    return [alias_name, arg]
  end

  # Assignment-like expression is not a command
  return if arg.start_with?(ASSIGN_OPERATORS_REGEXP) && !arg.start_with?(/==|=~/)

  # Local variable have precedence over command
  return if local_variables.include?(command)

  # Check visibility
  public_method = !!Kernel.instance_method(:public_method).bind_call(main, command) rescue false
  private_method = !public_method && !!Kernel.instance_method(:method).bind_call(main, command) rescue false
  if Command.execute_as_command?(command, public_method: public_method, private_method: private_method)
    [command, arg]
  end
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 32

def pop_workspace
  @workspace_stack.pop if @workspace_stack.size > 1
end

#prompt_n ⇒ Object

TODO: Remove this when developing v2.0



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

def prompt_n
  warn "IRB::Context#prompt_n is deprecated and will be removed in the next major release."
  ""
end

#prompt_n=(_) ⇒ Object

TODO: Remove this when developing v2.0



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# File 'lib/irb/context.rb', line 325

def prompt_n=(_)
  warn "IRB::Context#prompt_n= is deprecated and will be removed in the next major release."
  ""
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 486

def prompting?
  verbose? || @io.prompting?
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 14

def push_workspace(*_main)
  if _main.empty?
    if @workspace_stack.size > 1
      # swap the top two workspaces
      previous_workspace, current_workspace = @workspace_stack.pop(2)
      @workspace_stack.push current_workspace, previous_workspace
    end
  else
    new_workspace = WorkSpace.new(workspace.binding, _main[0])
    @workspace_stack.push new_workspace
    new_workspace.load_helper_methods_to_main
  end
end

#replace_workspace(workspace) ⇒ Object

Replace the current workspace with the given workspace.



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# File 'lib/irb/context.rb', line 234

def replace_workspace(workspace)
  @workspace_stack.pop
  @workspace_stack.push(workspace)
end

#save_history ⇒ Object 



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# File 'lib/irb/context.rb', line 214

def save_history
  IRB.conf[:SAVE_HISTORY]
end

#save_history=(val) ⇒ Object 



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# File 'lib/irb/context.rb', line 210

def save_history=(val)
  IRB.conf[:SAVE_HISTORY] = val
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 495

def set_last_value(value)
  @last_value = value
  workspace.local_variable_set :_, value
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 37

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 47

def use_loader=(val)
  self.class.remove_method(__method__)
  require_relative "ext/use-loader"
  __send__(__method__, val)
end

#use_tracer=(val) ⇒ Object 



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

def use_tracer=(val)
  require_relative "ext/tracer" if val
  IRB.conf[:USE_TRACER] = val
end

#verbose? ⇒ Boolean

Returns whether messages are displayed or not.

Returns:

  • (Boolean) 


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# File 'lib/irb/context.rb', line 467

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

#workspace ⇒ Object

Workspace in the current context.



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# File 'lib/irb/context.rb', line 229

def workspace
  @workspace_stack.last
end