# frozen_string_literal: true

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# Copyright (C) 2000 Network Applied Communication Laboratory, Inc.

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# Copyright (C) 2000 Information-technology Promotion Agency, Japan

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# Copyright (C) 2000-2003 NAKAMURA, Hiroshi <nahi@ruby-lang.org>

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require 'continuation'

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if $SAFE > 0

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STDERR.print "-r debug.rb is not available in safe mode\n"

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exit 1

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end

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require 'tracer'

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require 'pp'

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class Tracer # :nodoc:

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def Tracer.trace_func(*vars)

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Single.trace_func(*vars)

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end

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end

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SCRIPT_LINES__ = {} unless defined? SCRIPT_LINES__ # :nodoc:

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##

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# This library provides debugging functionality to Ruby.

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#

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# To add a debugger to your code, start by requiring +debug+ in your

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# program:

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#

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# def say(word)

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# require 'debug'

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# puts word

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# end

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#

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# This will cause Ruby to interrupt execution and show a prompt when the +say+

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# method is run.

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#

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# Once you're inside the prompt, you can start debugging your program.

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#

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# (rdb:1) p word

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# "hello"

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#

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# == Getting help

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#

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# You can get help at any time by pressing +h+.

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#

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# (rdb:1) h

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# Debugger help v.-0.002b

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# Commands

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# b[reak] [file:|class:]<line|method>

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# b[reak] [class.]<line|method>

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# set breakpoint to some position

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# wat[ch] <expression> set watchpoint to some expression

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# cat[ch] (<exception>|off) set catchpoint to an exception

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# b[reak] list breakpoints

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# cat[ch] show catchpoint

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# del[ete][ nnn] delete some or all breakpoints

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# disp[lay] <expression> add expression into display expression list

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# undisp[lay][ nnn] delete one particular or all display expressions

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# c[ont] run until program ends or hit breakpoint

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# s[tep][ nnn] step (into methods) one line or till line nnn

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# n[ext][ nnn] go over one line or till line nnn

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# w[here] display frames

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# f[rame] alias for where

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# l[ist][ (-|nn-mm)] list program, - lists backwards

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# nn-mm lists given lines

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# up[ nn] move to higher frame

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# down[ nn] move to lower frame

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# fin[ish] return to outer frame

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# tr[ace] (on|off) set trace mode of current thread

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# tr[ace] (on|off) all set trace mode of all threads

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# q[uit] exit from debugger

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# v[ar] g[lobal] show global variables

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# v[ar] l[ocal] show local variables

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# v[ar] i[nstance] <object> show instance variables of object

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# v[ar] c[onst] <object> show constants of object

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# m[ethod] i[nstance] <obj> show methods of object

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# m[ethod] <class|module> show instance methods of class or module

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# th[read] l[ist] list all threads

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# th[read] c[ur[rent]] show current thread

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# th[read] [sw[itch]] <nnn> switch thread context to nnn

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# th[read] stop <nnn> stop thread nnn

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# th[read] resume <nnn> resume thread nnn

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# p expression evaluate expression and print its value

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# h[elp] print this help

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# <everything else> evaluate

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#

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# == Usage

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#

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# The following is a list of common functionalities that the debugger

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# provides.

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#

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# === Navigating through your code

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#

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# In general, a debugger is used to find bugs in your program, which

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# often means pausing execution and inspecting variables at some point

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# in time.

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#

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# Let's look at an example:

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#

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# def my_method(foo)

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# require 'debug'

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# foo = get_foo if foo.nil?

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# raise if foo.nil?

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# end

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#

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# When you run this program, the debugger will kick in just before the

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# +foo+ assignment.

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#

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# (rdb:1) p foo

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# nil

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#

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# In this example, it'd be interesting to move to the next line and

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# inspect the value of +foo+ again. You can do that by pressing +n+:

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#

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# (rdb:1) n # goes to next line

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# (rdb:1) p foo

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# nil

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#

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# You now know that the original value of +foo+ was nil, and that it

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# still was nil after calling +get_foo+.

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#

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# Other useful commands for navigating through your code are:

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#

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# +c+::

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# Runs the program until it either exists or encounters another breakpoint.

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# You usually press +c+ when you are finished debugging your program and

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# want to resume its execution.

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# +s+::

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# Steps into method definition. In the previous example, +s+ would take you

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# inside the method definition of +get_foo+.

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# +r+::

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# Restart the program.

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# +q+::

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# Quit the program.

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#

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# === Inspecting variables

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#

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# You can use the debugger to easily inspect both local and global variables.

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# We've seen how to inspect local variables before:

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#

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# (rdb:1) p my_arg

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# 42

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#

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# You can also pretty print the result of variables or expressions:

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#

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# (rdb:1) pp %w{a very long long array containing many words}

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# ["a",

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# "very",

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# "long",

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# ...

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# ]

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#

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# You can list all local variables with +v l+:

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#

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# (rdb:1) v l

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# foo => "hello"

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#

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# Similarly, you can show all global variables with +v g+:

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#

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# (rdb:1) v g

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# all global variables

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#

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# Finally, you can omit +p+ if you simply want to evaluate a variable or

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# expression

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#

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# (rdb:1) 5**2

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# 25

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#

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# === Going beyond basics

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#

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# Ruby Debug provides more advanced functionalities like switching

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# between threads, setting breakpoints and watch expressions, and more.

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# The full list of commands is available at any time by pressing +h+.

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#

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# == Staying out of trouble

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#

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# Make sure you remove every instance of +require 'debug'+ before

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# shipping your code. Failing to do so may result in your program

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# hanging unpredictably.

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#

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# Debug is not available in safe mode.

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class DEBUGGER__

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MUTEX = Thread::Mutex.new # :nodoc:

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class Context # :nodoc:

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DEBUG_LAST_CMD = []

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begin

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require 'readline'

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def readline(prompt, hist)

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Readline::readline(prompt, hist)

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end

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rescue LoadError

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def readline(prompt, hist)

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STDOUT.print prompt

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STDOUT.flush

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line = STDIN.gets

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exit unless line

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line.chomp!

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line

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end

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USE_READLINE = false

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end

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def initialize

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if Thread.current == Thread.main

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@stop_next = 1

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else

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@stop_next = 0

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end

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@last_file = nil

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@file = nil

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@line = nil

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@no_step = nil

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@frames = []

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@finish_pos = 0

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@trace = false

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@catch = "StandardError"

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@suspend_next = false

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end

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def stop_next(n=1)

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@stop_next = n

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end

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def set_suspend

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@suspend_next = true

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end

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def clear_suspend

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@suspend_next = false

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end

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def suspend_all

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DEBUGGER__.suspend

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end

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def resume_all

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DEBUGGER__.resume

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end

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def check_suspend

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while MUTEX.synchronize {

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if @suspend_next

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DEBUGGER__.waiting.push Thread.current

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@suspend_next = false

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true

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end

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}

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end

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end

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def trace?

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@trace

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end

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def set_trace(arg)

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@trace = arg

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end

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def stdout

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DEBUGGER__.stdout

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end

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def break_points

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DEBUGGER__.break_points

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end

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def display

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DEBUGGER__.display

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end

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def context(th)

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DEBUGGER__.context(th)

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end

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def set_trace_all(arg)

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DEBUGGER__.set_trace(arg)

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end

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def set_last_thread(th)

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DEBUGGER__.set_last_thread(th)

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end

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def debug_eval(str, binding)

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begin

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eval(str, binding)

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rescue StandardError, ScriptError => e

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at = eval("caller(1)", binding)

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stdout.printf "%s:%s\n", at.shift, e.to_s.sub(/\(eval\):1:(in `.*?':)?/, '')

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for i in at

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stdout.printf "\tfrom %s\n", i

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end

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throw :debug_error

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end

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end

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def debug_silent_eval(str, binding)

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begin

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eval(str, binding)

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rescue StandardError, ScriptError

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nil

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end

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end

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def var_list(ary, binding)

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ary.sort!

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for v in ary

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stdout.printf " %s => %s\n", v, eval(v.to_s, binding).inspect

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end

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end

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def debug_variable_info(input, binding)

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case input

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when /^\s*g(?:lobal)?\s*$/

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var_list(global_variables, binding)

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when /^\s*l(?:ocal)?\s*$/

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var_list(eval("local_variables", binding), binding)

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when /^\s*i(?:nstance)?\s+/

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obj = debug_eval($', binding)

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var_list(obj.instance_variables, obj.instance_eval{binding()})

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when /^\s*c(?:onst(?:ant)?)?\s+/

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obj = debug_eval($', binding)

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unless obj.kind_of? Module

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stdout.print "Should be Class/Module: ", $', "\n"

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else

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var_list(obj.constants, obj.module_eval{binding()})

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end

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end

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end

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def debug_method_info(input, binding)

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case input

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when /^i(:?nstance)?\s+/

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obj = debug_eval($', binding)

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len = 0

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for v in obj.methods.sort

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len += v.size + 1

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if len > 70

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len = v.size + 1

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stdout.print "\n"

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end

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stdout.print v, " "

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end

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stdout.print "\n"

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else

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obj = debug_eval(input, binding)

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unless obj.kind_of? Module

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stdout.print "Should be Class/Module: ", input, "\n"

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else

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len = 0

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for v in obj.instance_methods(false).sort

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len += v.size + 1

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if len > 70

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len = v.size + 1

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stdout.print "\n"

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end

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stdout.print v, " "

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end

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stdout.print "\n"

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end

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end

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end

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def thnum

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num = DEBUGGER__.instance_eval{@thread_list[Thread.current]}

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unless num

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DEBUGGER__.make_thread_list

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num = DEBUGGER__.instance_eval{@thread_list[Thread.current]}

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end

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num

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end

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def debug_command(file, line, id, binding)

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MUTEX.lock

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unless defined?($debugger_restart) and $debugger_restart

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callcc{|c| $debugger_restart = c}

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end

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set_last_thread(Thread.current)

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frame_pos = 0

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binding_file = file

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binding_line = line

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previous_line = nil

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if ENV['EMACS']

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stdout.printf "\032\032%s:%d:\n", binding_file, binding_line

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else

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stdout.printf "%s:%d:%s", binding_file, binding_line,

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line_at(binding_file, binding_line)

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end

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@frames[0] = [binding, file, line, id]

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display_expressions(binding)

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prompt = true

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while prompt and input = readline("(rdb:%d) "%thnum(), true)

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catch(:debug_error) do

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if input == ""

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next unless DEBUG_LAST_CMD[0]

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input = DEBUG_LAST_CMD[0]

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stdout.print input, "\n"

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else

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DEBUG_LAST_CMD[0] = input

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end

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case input

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when /^\s*tr(?:ace)?(?:\s+(on|off))?(?:\s+(all))?$/

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if defined?( $2 )

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if $1 == 'on'

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set_trace_all true

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else

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set_trace_all false

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end

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elsif defined?( $1 )

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if $1 == 'on'

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set_trace true

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else

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set_trace false

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end

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end

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if trace?

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stdout.print "Trace on.\n"

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else

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stdout.print "Trace off.\n"

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end

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when /^\s*b(?:reak)?\s+(?:(.+):)?([^.:]+)$/

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pos = $2

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if $1

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klass = debug_silent_eval($1, binding)

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file = $1

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end

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if pos =~ /^\d+$/

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pname = pos

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pos = pos.to_i

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else

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pname = pos = pos.intern.id2name

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end

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break_points.push [true, 0, klass || file, pos]

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stdout.printf "Set breakpoint %d at %s:%s\n", break_points.size, klass || file, pname

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when /^\s*b(?:reak)?\s+(.+)[#.]([^.:]+)$/

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pos = $2.intern.id2name

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klass = debug_eval($1, binding)

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break_points.push [true, 0, klass, pos]

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stdout.printf "Set breakpoint %d at %s.%s\n", break_points.size, klass, pos

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when /^\s*wat(?:ch)?\s+(.+)$/

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exp = $1

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break_points.push [true, 1, exp]

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stdout.printf "Set watchpoint %d:%s\n", break_points.size, exp

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when /^\s*b(?:reak)?$/

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if break_points.find{|b| b[1] == 0}

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n = 1

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stdout.print "Breakpoints:\n"

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break_points.each do |b|

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if b[0] and b[1] == 0

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stdout.printf " %d %s:%s\n", n, b[2], b[3]

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end

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n += 1

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end

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end

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if break_points.find{|b| b[1] == 1}

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n = 1

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stdout.print "\n"

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stdout.print "Watchpoints:\n"

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for b in break_points

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if b[0] and b[1] == 1

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stdout.printf " %d %s\n", n, b[2]

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end

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n += 1

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end

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end

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if break_points.size == 0

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stdout.print "No breakpoints\n"

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else

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stdout.print "\n"

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end

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when /^\s*del(?:ete)?(?:\s+(\d+))?$/

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pos = $1

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unless pos

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input = readline("Clear all breakpoints? (y/n) ", false)

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if input == "y"

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for b in break_points

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b[0] = false

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end

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end

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else

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pos = pos.to_i

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if break_points[pos-1]

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break_points[pos-1][0] = false

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else

[497] Fix | Delete

stdout.printf "Breakpoint %d is not defined\n", pos

[498] Fix | Delete

end

[499] Fix | Delete