Class: Sandrbox::Value

Inherits:
Object
  • Object
show all
Defined in:
lib/sandrbox/value.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(line, line_no) ⇒ Value

Returns a new instance of Value.



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# File 'lib/sandrbox/value.rb', line 5

def initialize(line, line_no)
  self.unbound_methods = []
  self.unbound_constants = []
  self.line = line
  self.line_no = line_no
  evaluate
end

Instance Attribute Details

#error ⇒ Object

Returns the value of attribute error.



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# File 'lib/sandrbox/value.rb', line 3

def error
  @error
end

#line ⇒ Object

Returns the value of attribute line.



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# File 'lib/sandrbox/value.rb', line 3

def line
  @line
end

#line_no ⇒ Object

Returns the value of attribute line_no.



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# File 'lib/sandrbox/value.rb', line 3

def line_no
  @line_no
end

#result ⇒ Object

Returns the value of attribute result.



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# File 'lib/sandrbox/value.rb', line 3

def result
  @result
end

#time ⇒ Object

Returns the value of attribute time.



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# File 'lib/sandrbox/value.rb', line 3

def time
  @time
end

#unbound_constants ⇒ Object

Returns the value of attribute unbound_constants.



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# File 'lib/sandrbox/value.rb', line 3

def unbound_constants
  @unbound_constants
end

#unbound_methods ⇒ Object

Returns the value of attribute unbound_methods.



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# File 'lib/sandrbox/value.rb', line 3

def unbound_methods
  @unbound_methods
end

Instance Method Details

#evaluate ⇒ Object 



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# File 'lib/sandrbox/value.rb', line 13

def evaluate
  t = Thread.new do
    $SAFE = 2
    begin
      Timeout::timeout(0.5) do
        Sandrbox.config.bad_methods.each {|meth| remove_method(meth.first, meth.last)}
        Sandrbox.config.bad_constants.each {|const| remove_constant(const)}
        self.result = eval(line, TOPLEVEL_BINDING, "sandrbox", line_no)
      end
    rescue Exception => e
      self.result = "#{e.class}: #{e.to_s}"
      self.error = true
    ensure
      restore_constants
      restore_methods
    end
  end
  
  timeout = t.join(3)
  if timeout.nil?
    self.result = "SandrboxError: execution expired" 
    self.error = true
  end

  self
end

#to_s ⇒ Object 



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# File 'lib/sandrbox/value.rb', line 40

def to_s
  self.result
end