From: Chris Pine <newsgroups@...>
Date: 2004-02-12T23:25:07+09:00
Subject: capturing warnings

Hello,

Here's a method which executes the code in the string `code', giving it the
input from the array of strings `input' as it asks for it.  The output is
captured, and so are any errors.

However, it doesn't capture warnings.  Anyone know how to do that?  NOTE:  I
only want to capture warning generated by the code in `code', not in the
rest of my program.



  def executeCode (code, input)
    #  Wrap code to catch errors and to stop SystemExit.
    code = <<-END_CODE
      begin
        #{code}
      rescue SystemExit
      rescue Exception => error
        puts error.inspect
      end
    END_CODE

    strIO = StringIO.new

    if !input.empty?
      input = input.join("\n")+"\n"
      input = StringIO.new(input, "r")
      class << strIO; self; end.module_eval do
        ['gets', 'getc', 'read'].each do |meth|
          define_method(meth) do |*params|
            inStr = input.method(meth).call(*params)
            puts @@INPUT+inStr.chomp+(@@INPUT.reverse)  #  Echo input.
            inStr
          end
        end
      end
    end

    #  Pass these methods to strIO:
    kernelMethods = ['puts', 'putc', 'gets']

    #  Swap out Kernel methods...
    kernelMethods.each do |meth|
      Kernel.module_eval "alias __temp__tutorial__#{meth}__ #{meth}"
      Kernel.module_eval do
        define_method(meth) do |*params|
          strIO.method(meth).call(*params)
        end
      end
    end

    begin
      strIO.instance_eval code
    rescue Exception => error  #  Catch parse errors.
      return error.inspect
    end

    #  ...and swap them back in.
    kernelMethods.each do |meth|
      Kernel.module_eval "alias #{meth} __temp__tutorial__#{meth}__"
    end

    strIO.string
  end



Any help would be much appreciated,

Chris