Class: IRB::Irb

Inherits:
Object show all
Defined in:
lib/irb.rb,
lib/irb/ext/multi-irb.rb

Constant Summary collapse

PROMPT_MAIN_TRUNCATE_LENGTH =

Note: instance and index assignment expressions could also be written like: “foo.bar=(1)” and “foo.[]=(1, bar)”, when expressed that way, the former be parsed as :assign and echo will be suppressed, but the latter is parsed as a :method_add_arg and the output won’t be suppressed

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PROMPT_MAIN_TRUNCATE_OMISSION = 
'...'
CONTROL_CHARACTERS_PATTERN = 
"\x00-\x1F"

Class Attribute Summary collapse

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(workspace = nil, input_method = nil, from_binding: false) ⇒ Irb

Creates a new irb session



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# File 'lib/irb.rb', line 98

def initialize(workspace = nil, input_method = nil, from_binding: false)
  @from_binding = from_binding
  @prompt_part_cache = nil
  @context = Context.new(self, workspace, input_method)
  @context.workspace.load_helper_methods_to_main
  @signal_status = :IN_IRB
  @scanner = RubyLex.new
  @line_no = 1
end

Class Attribute Details

.run_nesting_depth ⇒ Object

TODO: When refactoring to v2.0, find a better way to manage and track nesting sessions.



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# File 'lib/irb.rb', line 87

def run_nesting_depth
  @run_nesting_depth
end

Instance Attribute Details

#context ⇒ Object (readonly)

Returns the current context of this irb session



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# File 'lib/irb.rb', line 91

def context
  @context
end

#from_binding ⇒ Object (readonly)

Returns the value of attribute from_binding.



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# File 'lib/irb.rb', line 95

def from_binding
  @from_binding
end

#scanner ⇒ Object

The lexer used by this irb session



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# File 'lib/irb.rb', line 93

def scanner
  @scanner
end

Instance Method Details

#command?(code) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/irb.rb', line 313

def command?(code)
  parse_input(code).is_a?(Statement::Command)
end

#configure_io ⇒ Object 



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# File 'lib/irb.rb', line 317

def configure_io
  if @context.io.respond_to?(:check_termination)
    @context.io.check_termination do |code|
      if Reline::IOGate.in_pasting?
        rest = @scanner.check_termination_in_prev_line(code, local_variables: @context.local_variables)
        if rest
          Reline.delete_text
          rest.bytes.reverse_each do |c|
            Reline.ungetc(c)
          end
          true
        else
          false
        end
      else
        next true if command?(code)

        _tokens, _opens, terminated = @scanner.check_code_state(code, local_variables: @context.local_variables)
        terminated
      end
    end
  end
  if @context.io.respond_to?(:dynamic_prompt)
    @context.io.dynamic_prompt do |lines|
      code = lines.map{ |l| l + "\n" }.join
      tokens = RubyLex.ripper_lex_without_warning(code, local_variables: @context.local_variables)
      parse_lex_result = Prism.parse_lex(code, scopes: [@context.local_variables])
      line_results = IRB::NestingParser.parse_by_line(parse_lex_result)
      tokens_until_line = []
      line_results.map.with_index do |(_prev_opens, next_opens, _min_depth), line_num_offset|
        tokens_until_line << tokens.shift while !tokens.empty? && tokens.first.pos[0] <= line_num_offset + 1
        continue = @scanner.should_continue?(tokens_until_line)
        generate_prompt(next_opens, continue, line_num_offset)
      end
    end
  end

  if @context.io.respond_to?(:auto_indent) and @context.auto_indent_mode
    @context.io.auto_indent do |lines, line_index, byte_pointer, is_newline|
      next nil if lines == [nil] # Workaround for exit IRB with CTRL+d
      next nil if !is_newline && lines[line_index]&.byteslice(0, byte_pointer)&.match?(/\A\s*\z/)

      code = lines[0..line_index].map { |l| "#{l}\n" }.join
      parse_lex_result = Prism.parse_lex(code, scopes: [@context.local_variables])
      @scanner.process_indent_level(parse_lex_result, lines, line_index, is_newline)
    end
  end
end

#convert_invalid_byte_sequence(str, enc) ⇒ Object 



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# File 'lib/irb.rb', line 366

def convert_invalid_byte_sequence(str, enc)
  str.force_encoding(enc)
  str.scrub { |c|
    c.bytes.map{ |b| "\\x#{b.to_s(16).upcase}" }.join
  }
end

#debug_break ⇒ Object

A hook point for debug command’s breakpoint after :IRB_EXIT as well as its clean-up



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# File 'lib/irb.rb', line 110

def debug_break
  # it means the debug integration has been activated
  if defined?(DEBUGGER__) && DEBUGGER__.respond_to?(:capture_frames_without_irb)
    # after leaving this initial breakpoint, revert the capture_frames patch
    DEBUGGER__.singleton_class.send(:alias_method, :capture_frames, :capture_frames_without_irb)
    # and remove the redundant method
    DEBUGGER__.singleton_class.send(:undef_method, :capture_frames_without_irb)
  end
end

#debug_readline(binding) ⇒ Object 



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# File 'lib/irb.rb', line 120

def debug_readline(binding)
  workspace = IRB::WorkSpace.new(binding)
  context.replace_workspace(workspace)
  context.workspace.load_helper_methods_to_main
  @line_no += 1

  # When users run:
  # 1.  Debugging commands, like `step 2`
  # 2.  Any input that's not irb-command, like `foo = 123`
  #
  #
  # Irb#eval_input will simply return the input, and we need to pass it to the
  # debugger.
  input = nil
  forced_exit = catch(:IRB_EXIT) do
    if History.save_history? && context.io.support_history_saving?
      # Previous IRB session's history has been saved when `Irb#run` is exited We need
      # to make sure the saved history is not saved again by resetting the counter
      context.io.reset_history_counter

      begin
        input = eval_input
      ensure
        context.io.save_history
      end
    else
      input = eval_input
    end
    false
  end

  Kernel.exit if forced_exit

  if input&.include?("\n")
    @line_no += input.count("\n") - 1
  end

  input
end

#each_top_level_statement ⇒ Object 



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# File 'lib/irb.rb', line 292

def each_top_level_statement
  loop do
    code = readmultiline
    break unless code
    yield parse_input(code), @line_no
    @line_no += code.count("\n")
  rescue RubyLex::TerminateLineInput
  end
end

#encode_with_invalid_byte_sequence(str, enc) ⇒ Object 



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# File 'lib/irb.rb', line 373

def encode_with_invalid_byte_sequence(str, enc)
  conv = Encoding::Converter.new(str.encoding, enc)
  dst = String.new
  begin
    ret = conv.primitive_convert(str, dst)
    case ret
    when :invalid_byte_sequence
      conv.insert_output(conv.primitive_errinfo[3].dump[1..-2])
      redo
    when :undefined_conversion
      c = conv.primitive_errinfo[3].dup.force_encoding(conv.primitive_errinfo[1])
      conv.insert_output(c.dump[1..-2])
      redo
    when :incomplete_input
      conv.insert_output(conv.primitive_errinfo[3].dump[1..-2])
    when :finished
    end
    break
  end while nil
  dst
end

#eval_input ⇒ Object

Evaluates input for this session.



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

def eval_input
  configure_io

  each_top_level_statement do |statement, line_no|
    signal_status(:IN_EVAL) do
      begin
        # If the integration with debugger is activated, we return certain input if it
        # should be dealt with by debugger
        if @context.with_debugger && statement.should_be_handled_by_debugger?
          return statement.code
        end

        @context.evaluate(statement, line_no)

        if @context.echo? && !statement.suppresses_echo?
          if statement.is_assignment?
            if @context.echo_on_assignment?
              output_value(@context.echo_on_assignment? == :truncate)
            end
          else
            output_value
          end
        end
      rescue SystemExit, SignalException
        raise
      rescue Interrupt, Exception => exc
        handle_exception(exc)
        @context.workspace.local_variable_set(:_, exc)
      end
    end
  end
end

#handle_exception(exc) ⇒ Object 



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# File 'lib/irb.rb', line 395

def handle_exception(exc)
  if exc.backtrace[0] =~ /\/irb(2)?(\/.*|-.*|\.rb)?:/ && exc.class.to_s !~ /^IRB/ &&
     !(SyntaxError === exc) && !(EncodingError === exc)
    # The backtrace of invalid encoding hash (ex. {"\xAE": 1}) raises EncodingError without lineno.
    irb_bug = true
  else
    irb_bug = false
    # To support backtrace filtering while utilizing Exception#full_message, we need to clone
    # the exception to avoid modifying the original exception's backtrace.
    exc = exc.clone
    filtered_backtrace = exc.backtrace.map { |l| @context.workspace.filter_backtrace(l) }.compact
    backtrace_filter = IRB.conf[:BACKTRACE_FILTER]

    if backtrace_filter
      if backtrace_filter.respond_to?(:call)
        filtered_backtrace = backtrace_filter.call(filtered_backtrace)
      else
        warn "IRB.conf[:BACKTRACE_FILTER] #{backtrace_filter} should respond to `call` method"
      end
    end

    exc.set_backtrace(filtered_backtrace)
  end

  highlight = Color.colorable?

  order =
    if RUBY_VERSION < '3.0.0'
      STDOUT.tty? ? :bottom : :top
    else # '3.0.0' <= RUBY_VERSION
      :top
    end

  message = exc.full_message(order: order, highlight: highlight)
  message = convert_invalid_byte_sequence(message, exc.message.encoding)
  message = encode_with_invalid_byte_sequence(message, IRB.conf[:LC_MESSAGES].encoding) unless message.encoding.to_s.casecmp?(IRB.conf[:LC_MESSAGES].encoding.to_s)
  message = message.gsub(/((?:^\t.+$\n)+)/) { |m|
    case order
    when :top
      lines = m.split("\n")
    when :bottom
      lines = m.split("\n").reverse
    end
    unless irb_bug
      if lines.size > @context.back_trace_limit
        omit = lines.size - @context.back_trace_limit
        lines = lines[0..(@context.back_trace_limit - 1)]
        lines << "\t... %d levels..." % omit
      end
    end
    lines = lines.reverse if order == :bottom
    lines.map{ |l| l + "\n" }.join
  }
  # The "<top (required)>" in "(irb)" may be the top level of IRB so imitate the main object.
  message = message.gsub(/\(irb\):(?<num>\d+):in (?<open_quote>[`'])<(?<frame>top \(required\))>'/) { "(irb):#{$~[:num]}:in #{$~[:open_quote]}<main>'" }
  puts message

  if irb_bug
    puts "This may be an issue with IRB. If you believe this is an unexpected behavior, please report it to https://github.com/ruby/irb/issues"
  end
rescue Exception => handler_exc
  begin
    puts exc.inspect
    puts "backtraces are hidden because #{handler_exc} was raised when processing them"
  rescue Exception
    puts 'Uninspectable exception occurred'
  end
end

#inspect ⇒ Object

Outputs the local variables to this current session, including #signal_status and #context, using IRB::Locale.



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# File 'lib/irb.rb', line 575

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

#output_value(omit = false) ⇒ Object

:nodoc:



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# File 'lib/irb.rb', line 540

def output_value(omit = false) # :nodoc:
  unless @context.return_format.include?('%')
    puts @context.return_format
    return
  end

  winheight, winwidth = @context.io.winsize
  if omit
    content, overflow = Pager.take_first_page(winwidth, 1) do |out|
      @context.inspect_last_value(out)
    end
    if overflow
      content = "\n#{content}" if @context.newline_before_multiline_output?
      content = "#{content}..."
      content = "#{content}\e[0m" if Color.colorable?
    end
    puts format(@context.return_format, content.chomp)
  elsif Pager.should_page? && @context.inspector_support_stream_output?
    formatter_proc = ->(content, multipage) do
      content = content.chomp
      content = "\n#{content}" if @context.newline_before_multiline_output? && (multipage || content.include?("\n"))
      format(@context.return_format, content)
    end
    Pager.page_with_preview(winwidth, winheight, formatter_proc) do |out|
      @context.inspect_last_value(out)
    end
  else
    content = @context.inspect_last_value.chomp
    content = "\n#{content}" if @context.newline_before_multiline_output? && content.include?("\n")
    Pager.page_content(format(@context.return_format, content), retain_content: true)
  end
end

#parse_input(code) ⇒ Object 



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# File 'lib/irb.rb', line 302

def parse_input(code)
  if code.match?(/\A\n*\z/)
    return Statement::EmptyInput.new
  end

  code = code.dup.force_encoding(@context.io.encoding)
  is_assignment_expression = @scanner.assignment_expression?(code, local_variables: @context.local_variables)

  @context.parse_input(code, is_assignment_expression)
end

#read_input(prompt) ⇒ Object 



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# File 'lib/irb.rb', line 238

def read_input(prompt)
  signal_status(:IN_INPUT) do
    @context.io.prompt = prompt
    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" if @context.prompting?
      end
    end
    l
  end
end

#read_input_nomultiline(prompt) ⇒ Object 



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# File 'lib/irb.rb', line 257

def read_input_nomultiline(prompt)
  code = +''
  line_offset = 0
  loop do
    line = read_input(prompt)
    unless line
      return code.empty? ? nil : code
    end

    code << line
    return code if command?(code)

    tokens, opens, terminated = @scanner.check_code_state(code, local_variables: @context.local_variables)
    return code if terminated

    line_offset += 1
    continue = @scanner.should_continue?(tokens)
    prompt = generate_prompt(opens, continue, line_offset)
  end
end

#readmultiline ⇒ Object 



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# File 'lib/irb.rb', line 278

def readmultiline
  with_prompt_part_cached do
    prompt = generate_prompt([], false, 0)

    if @context.io.respond_to?(:check_termination)
      # multiline
      read_input(prompt)
    else
      # nomultiline
      read_input_nomultiline(prompt)
    end
  end
end

#run(conf = IRB.conf) ⇒ Object 



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

def run(conf = IRB.conf)
  # Use run_nesting_depth to determine if we're in a nested session.
  in_nested_session = Irb.run_nesting_depth > 0
  Irb.run_nesting_depth += 1

  conf[:IRB_RC].call(context) if conf[:IRB_RC]
  prev_context = conf[:MAIN_CONTEXT]
  conf[:MAIN_CONTEXT] = context

  load_history = !in_nested_session && context.io.support_history_saving?
  save_history = load_history && History.save_history?

  if load_history
    context.io.load_history
  end

  prev_trap = trap("SIGINT") do
    signal_handle
  end

  begin
    if defined?(RubyVM.keep_script_lines)
      keep_script_lines_backup = RubyVM.keep_script_lines
      RubyVM.keep_script_lines = true
    end

    forced_exit = catch(:IRB_EXIT) do
      eval_input
    end
  ensure
    Irb.run_nesting_depth -= 1

    # Do not restore to nil. It will cause IRB crash when used with threads.
    IRB.conf[:MAIN_CONTEXT] = prev_context if prev_context

    RubyVM.keep_script_lines = keep_script_lines_backup if defined?(RubyVM.keep_script_lines)
    trap("SIGINT", prev_trap)
    conf[:AT_EXIT].each{|hook| hook.call}

    context.io.save_history if save_history
    Kernel.exit if forced_exit
  end
end

#signal_handle ⇒ Object

Handler for the signal SIGINT, see Kernel#trap for more information.



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# File 'lib/irb.rb', line 506

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

#signal_status(status) ⇒ Object

Evaluates the given block using the given status.



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# File 'lib/irb.rb', line 528

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

#suspend_input_method(input_method) ⇒ Object

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.



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# File 'lib/irb.rb', line 495

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

#suspend_name(path = nil, name = nil) ⇒ Object

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.



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# File 'lib/irb.rb', line 468

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

#suspend_workspace(workspace) ⇒ Object

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.



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# File 'lib/irb.rb', line 483

def suspend_workspace(workspace)
  current_workspace = @context.workspace
  @context.replace_workspace(workspace)
  yield
ensure
  @context.replace_workspace current_workspace
end