Class: SafeEval

Inherits:
Object show all
Defined in:
lib/safe_eval.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(safe = 3, collect = true) ⇒ SafeEval

Returns a new instance of SafeEval.



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# File 'lib/safe_eval.rb', line 14

def initialize(safe=3, collect=true)
  @safe = safe
  @collect = collect
end

Instance Attribute Details

#collect ⇒ Object

Returns the value of attribute collect.



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# File 'lib/safe_eval.rb', line 11

def collect
  @collect
end

#output ⇒ Object (readonly)

Returns the value of attribute output.



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# File 'lib/safe_eval.rb', line 12

def output
  @output
end

#safe ⇒ Object

Returns the value of attribute safe.



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# File 'lib/safe_eval.rb', line 11

def safe
  @safe
end

Instance Method Details

#run(code_str = '', binding = nil, filename = '(SafeEval)', lineno = 1) ⇒ Object 



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# File 'lib/safe_eval.rb', line 19

def run(code_str='', binding=nil, filename='(SafeEval)', lineno=1)
  binding = yield if block_given?
  lineno -= 1
  @output = nil
  @output = [] if @collect
  result = nil
  code_str.strip!
  return result if code_str.empty?
  rd_result, wr_result = IO.pipe
  open('|-') do |io|
    if io.nil? then # son
      status = 0
      rd_result.close
      set_environment
      begin
        code = "$SAFE = #@safe\n#{code_str}"
        result = eval(code, binding, filename, lineno)
        status = 0 # needed if the user change the status
      rescue Exception => exception
        status = 1
        result = exception
      ensure
        Marshal.dump(result, wr_result)
        wr_result.close
        exit!(status)
      end
    else # father
      wr_result.close
      io.each_line { |l| @output << l.chomp } if @collect
      result = Marshal.load(rd_result)
      rd_result.close
      Process.waitpid(io.pid)
    end
  end
  raise result if $?.exitstatus == 1
  @output = nil unless @collect
  return result
end