class IRB::WorkSpace

Attributes

binding[R]

The Binding of this workspace

main[R]

The top-level workspace of this context, also available as IRB.conf[:__MAIN__]

Public Class Methods

new(*main) click to toggle source

Creates a new workspace.

set self to main if specified, otherwise inherit main from TOPLEVEL_BINDING.

# File lib/irb/workspace.rb, line 17
    def initialize(*main)
      if main[0].kind_of?(Binding)
        @binding = main.shift
      elsif IRB.conf[:SINGLE_IRB]
        @binding = TOPLEVEL_BINDING
      else
        case IRB.conf[:CONTEXT_MODE]
        when 0  # binding in proc on TOPLEVEL_BINDING
          @binding = eval("proc{binding}.call",
                          TOPLEVEL_BINDING,
                          __FILE__,
                          __LINE__)
        when 1  # binding in loaded file
          require "tempfile"
          f = Tempfile.open("irb-binding")
          f.print <<EOF
      $binding = binding
EOF
          f.close
          load f.path
          @binding = $binding

        when 2  # binding in loaded file(thread use)
          unless defined? BINDING_QUEUE
            IRB.const_set(:BINDING_QUEUE, Thread::SizedQueue.new(1))
            Thread.abort_on_exception = true
            Thread.start do
              eval "require \"irb/ws-for-case-2\"", TOPLEVEL_BINDING, __FILE__, __LINE__
            end
            Thread.pass
          end
          @binding = BINDING_QUEUE.pop

        when 3  # binding in function on TOPLEVEL_BINDING(default)
          @binding = eval("def irb_binding; private; binding; end; irb_binding",
                          TOPLEVEL_BINDING,
                          __FILE__,
                          __LINE__ - 3)
        end
      end
      if main.empty?
        @main = eval("self", @binding)
      else
        @main = main[0]
        IRB.conf[:__MAIN__] = @main
        case @main
        when Module
          @binding = eval("IRB.conf[:__MAIN__].module_eval('binding', __FILE__, __LINE__)", @binding, __FILE__, __LINE__)
        else
          begin
            @binding = eval("IRB.conf[:__MAIN__].instance_eval('binding', __FILE__, __LINE__)", @binding, __FILE__, __LINE__)
          rescue TypeError
            IRB.fail CantChangeBinding, @main.inspect
          end
        end
      end
      eval("_=nil", @binding)
    end

Public Instance Methods

__evaluate__(context, statements, file = nil, line = nil)

Alias for: evaluate

code_around_binding() click to toggle source

# File lib/irb/workspace.rb, line 109
def code_around_binding
  file, pos = @binding.eval('[__FILE__, __LINE__]')

  unless defined?(::SCRIPT_LINES__[file]) && lines = ::SCRIPT_LINES__[file]
    begin
      lines = File.readlines(file)
    rescue SystemCallError
      return
    end
  end
  pos -= 1

  start_pos = [pos - 5, 0].max
  end_pos   = [pos + 5, lines.size - 1].min

  fmt = " %2s %#{end_pos.to_s.length}d: %s"
  body = (start_pos..end_pos).map do |current_pos|
    sprintf(fmt, pos == current_pos ? '=>' : '', current_pos + 1, lines[current_pos])
  end.join("")
  "\nFrom: #{file} @ line #{pos + 1} :\n\n#{body}\n"
end

evaluate(context, statements, file = nil, line = nil) click to toggle source

Evaluate the context of this workspace and use the Tracer library to output the exact lines of code are being executed in chronological order.

See lib/tracer.rb for more information.

# File lib/irb/ext/tracer.rb, line 55
def evaluate(context, statements, file = nil, line = nil)
  if context.use_tracer? && file != nil && line != nil
    Tracer.on
    begin
      __evaluate__(context, statements, file, line)
    ensure
      Tracer.off
    end
  else
    __evaluate__(context, statements, file || __FILE__, line || __LINE__)
  end
end

Also aliased as: __evaluate__

filter_backtrace(bt) click to toggle source

error message manipulator

# File lib/irb/workspace.rb, line 88
def filter_backtrace(bt)
  case IRB.conf[:CONTEXT_MODE]
  when 0
    return nil if bt =~ /\(irb_local_binding\)/
  when 1
    if(bt =~ %r!/tmp/irb-binding! or
        bt =~ %r!irb/.*\.rb! or
        bt =~ /irb\.rb/)
      return nil
    end
  when 2
    return nil if bt =~ /irb\/.*\.rb/
    return nil if bt =~ /irb\.rb/
  when 3
    return nil if bt =~ /irb\/.*\.rb/
    return nil if bt =~ /irb\.rb/
    bt = bt.sub(/:\s*in `irb_binding'/, '')
  end
  bt
end