# frozen_string_literal: false

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#

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# frame.rb -

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# $Release Version: 0.9$

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# $Revision$

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# by Keiju ISHITSUKA(Nihon Rational Software Co.,Ltd)

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#

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# --

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#

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#

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#

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module IRB

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class Frame

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class FrameOverflow < StandardError

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def initialize

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super("frame overflow")

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end

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end

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class FrameUnderflow < StandardError

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def initialize

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super("frame underflow")

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end

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end

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# Default number of stack frames

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INIT_STACK_TIMES = 3

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# Default number of frames offset

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CALL_STACK_OFFSET = 3

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# Creates a new stack frame

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def initialize

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@frames = [TOPLEVEL_BINDING] * INIT_STACK_TIMES

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end

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# Used by Kernel#set_trace_func to register each event in the call stack

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def trace_func(event, file, line, id, binding)

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case event

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when 'call', 'class'

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@frames.push binding

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when 'return', 'end'

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@frames.pop

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end

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end

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# Returns the +n+ number of frames on the call stack from the last frame

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# initialized.

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#

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# Raises FrameUnderflow if there are no frames in the given stack range.

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def top(n = 0)

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bind = @frames[-(n + CALL_STACK_OFFSET)]

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fail FrameUnderflow unless bind

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bind

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end

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# Returns the +n+ number of frames on the call stack from the first frame

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# initialized.

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#

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# Raises FrameOverflow if there are no frames in the given stack range.

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def bottom(n = 0)

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bind = @frames[n]

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fail FrameOverflow unless bind

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bind

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end

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# Convenience method for Frame#bottom

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def Frame.bottom(n = 0)

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@backtrace.bottom(n)

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end

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# Convenience method for Frame#top

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def Frame.top(n = 0)

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@backtrace.top(n)

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end

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# Returns the binding context of the caller from the last frame initialized

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def Frame.sender

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eval "self", @backtrace.top

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end

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@backtrace = Frame.new

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set_trace_func proc{|event, file, line, id, binding, klass|

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@backtrace.trace_func(event, file, line, id, binding)

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}

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end

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end

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