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# Copyright (C) 2010-2012 Rocky Bernstein <rockyb@rubyforge.net>
require 'rubygems'
require_relative 'virtual'
class Trepan
class CmdProcessor < VirtualCmdProcessor
def debug_eval(str, max_fake_filename=15)
begin
debug_eval_with_exception(str, max_fake_filename)
rescue SyntaxError, StandardError, ScriptError => e
exception_dump(e, @settings[:stack_trace_on_error], $!.backtrace)
nil
end
end
def debug_eval_with_exception(str, max_fake_filename=15)
# FIXME: Do we need to set trace_off?
RubyVM::Frame.get.trace_off = true
filename, b = get_binding_and_filename(str, max_fake_filename)
RubyVM::Frame.get.trace_off = false
eval(str, b, filename)
end
def debug_eval_no_errmsg(str, max_fake_filename=15)
begin
debug_eval_with_exception(str, max_fake_filename)
rescue SyntaxError, StandardError, ScriptError => e
nil
end
end
def eval_code(str, max_fake_filename)
obj = debug_eval(str, max_fake_filename)
# idx = @user_variables
# @user_variables += 1
# str = "$d#{idx}"
# Rubinius::Globals[str.to_sym] = obj
# msg "#{str} = #{obj.inspect}"
msg "#{obj.inspect}"
obj
end
def exception_dump(e, stack_trace, backtrace)
str = "#{e.class} Exception:\n\t#{e.message}"
if stack_trace
str += "\n" + backtrace.map{|l| "\t#{l}"}.join("\n") rescue nil
end
msg str
# throw :debug_error
end
def fake_eval_filename(str, maxlen = 15)
fake_filename =
if maxlen < str.size
# FIXME: Guard against \" in positions 13..15?
str.inspect[0..maxlen-1] + '"...'
else
str.inspect
end
"(eval #{fake_filename})"
end
def get_binding_and_filename(str, maxlen)
b =
begin
@frame.binding
rescue
binding
end
filename = fake_eval_filename(str, maxlen)
return [filename, b]
end
end
end
if __FILE__ == $0
# Demo it.
cmdp = Trepan::CmdProcessor.new([])
puts cmdp.fake_eval_filename('x = 1; y = 2')
puts cmdp.fake_eval_filename('x = 1; y = 2', 7)
def cmdp.errmsg(msg)
puts "** #{msg}"
end
def cmdp.msg(msg)
puts "** #{msg}"
end
begin
1/0
rescue Exception => exc
cmdp.exception_dump(exc, true, $!.backtrace)
puts '=' * 40
end
x = 10
require 'thread_frame'
cmdp.instance_variable_set('@frame', RubyVM::Frame.current)
cmdp.instance_variable_set('@settings', {:stack_trace_on_error => true})
def cmdp.msg(mess) ; puts mess end
puts cmdp.debug_eval('x = "#{x}"')
puts '=' * 40
puts cmdp.debug_eval('x+')
puts cmdp.debug_eval_no_errmsg('y+')
puts '=' * 40
puts cmdp.debug_eval('y = 1; x+', 4)
puts '=' * 40
end