Sha256: 187447ce9a24dec9e8eefd67ade9e41d3fc2fe86a894f30405953297fbee8e72
Contents?: true
Size: 1.88 KB
Versions: 67
Compression:
Stored size: 1.88 KB
Contents
#
# frame.rb -
# $Release Version: 0.9$
# $Revision: 47112 $
# 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
Version data entries
67 entries across 39 versions & 3 rubygems