Class: IRB::Irb

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

Overview

irb interpriter main routine

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(workspace = nil, input_method = nil, output_method = nil) ⇒ Irb

Returns a new instance of Irb.



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

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

Instance Attribute Details

#context ⇒ Object (readonly)

Returns the value of attribute context



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# File 'lib/irb.rb', line 99

def context
  @context
end

#scanner ⇒ Object

Returns the value of attribute scanner



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# File 'lib/irb.rb', line 100

def scanner
  @scanner
end

Instance Method Details

#eval_input ⇒ Object 



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# File 'lib/irb.rb', line 102

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 @context.prompt_i
	  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
 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/
   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

#inspect ⇒ Object 



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

def inspect
  ary = []
  for iv in instance_variables
	case iv
	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 ⇒ Object 



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# File 'lib/irb.rb', line 300

def output_value
  if @context.inspect?
    printf @context.return_format, @context.last_value.inspect
  else
    printf @context.return_format, @context.last_value
  end
end

#prompt(prompt, ltype, indent, line_no) ⇒ Object 



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# File 'lib/irb.rb', line 269

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

#signal_handle ⇒ Object 



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# File 'lib/irb.rb', line 236

def signal_handle
  unless @context.ignore_sigint?
	print "\nabort!!\n" if @context.verbose?
	exit
  end

  case @signal_status
  when :IN_INPUT
	print "^C\n"
	IRB.JobManager.thread(self).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 



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

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_context(context) ⇒ Object 



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# File 'lib/irb.rb', line 227

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

#suspend_input_method(input_method) ⇒ Object 



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# File 'lib/irb.rb', line 217

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 



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# File 'lib/irb.rb', line 197

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 



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

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