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authorJari Vetoniemi <jari.vetoniemi@indooratlas.com>2020-03-16 18:49:26 +0900
committerJari Vetoniemi <jari.vetoniemi@indooratlas.com>2020-03-30 00:39:06 +0900
commitfcbf63e62c627deae76c1b8cb8c0876c536ed811 (patch)
tree64cb17de3f41a2b6fef2368028fbd00349946994 /jni/ruby/lib/irb/frame.rb
Fresh start
Diffstat (limited to 'jni/ruby/lib/irb/frame.rb')
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diff --git a/jni/ruby/lib/irb/frame.rb b/jni/ruby/lib/irb/frame.rb
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+#
+# 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