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#
#   frame.rb -
#   	$Release Version: 0.9$
#   	$Revision: 38515 $
#   	by Keiju ISHITSUKA(Nihon Rational Software Co.,Ltd)
#
# --
#
#
#

require "e2mmap"

module IRB
  class Frame
    extend Exception2MessageMapper
    def_exception :FrameOverflow, "frame overflow"
    def_exception :FrameUnderflow, "frame underflow"

    # Default number of stack frames
    INIT_STACK_TIMES = 3
    # Default number of frames offset
    CALL_STACK_OFFSET = 3

    # Creates a new stack frame
    def initialize
      @frames = [TOPLEVEL_BINDING] * INIT_STACK_TIMES
    end

    # Used by Kernel#set_trace_func to register each event in the call stack
    def trace_func(event, file, line, id, binding)
      case event
      when 'call', 'class'
	@frames.push binding
      when 'return', 'end'
	@frames.pop
      end
    end

    # Returns the +n+ number of frames on the call stack from the last frame
    # initialized.
    #
    # Raises FrameUnderflow if there are no frames in the given stack range.
    def top(n = 0)
      bind = @frames[-(n + CALL_STACK_OFFSET)]
      Fail FrameUnderflow unless bind
      bind
    end

    # Returns the +n+ number of frames on the call stack from the first frame
    # initialized.
    #
    # Raises FrameOverflow if there are no frames in the given stack range.
    def bottom(n = 0)
      bind = @frames[n]
      Fail FrameOverflow unless bind
      bind
    end

    # Convenience method for Frame#bottom
    def Frame.bottom(n = 0)
      @backtrace.bottom(n)
    end

    # Convenience method for Frame#top
    def Frame.top(n = 0)
      @backtrace.top(n)
    end

    # Returns the binding context of the caller from the last frame initialized
    def Frame.sender
      eval "self", @backtrace.top
    end

    @backtrace = Frame.new
    set_trace_func proc{|event, file, line, id, binding, klass|
      @backtrace.trace_func(event, file, line, id, binding)
    }
  end
end

Filemanager

DIR : / usr/ share/ ruby/ irb/
Name Type Size Permission Actions
cmd Folder 0755
ext Folder 0755
lc Folder 0755
completion.rb File 6.12 KB 0644
context.rb File 11.91 KB 0644
extend-command.rb File 9.54 KB 0644
frame.rb File 1.87 KB 0644
help.rb File 613 B 0644
init.rb File 7.07 KB 0644
input-method.rb File 4.58 KB 0644
inspector.rb File 3.9 KB 0644
locale.rb File 4.43 KB 0644
magic-file.rb File 893 B 0644
notifier.rb File 6.87 KB 0644
output-method.rb File 2.39 KB 0644
ruby-lex.rb File 22.59 KB 0644
ruby-token.rb File 7.3 KB 0644
slex.rb File 5.95 KB 0644
src_encoding.rb File 90 B 0644
version.rb File 251 B 0644
workspace.rb File 2.78 KB 0644
ws-for-case-2.rb File 195 B 0644
xmp.rb File 4.03 KB 0644