Module: BindingOfCaller

Defined in:
lib/ext/boc.rb

Constant Summary collapse

VERSION = 
"0.1.3"

Class Method Summary collapse

Class Method Details

.binding_of_caller ⇒ Object

module_function



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# File 'lib/ext/boc.rb', line 30

def self.binding_of_caller
   cont = nil
   event_count = 0
   tracer = lambda do |event, file, line, id, binding, classname|
      event_count += 1
      if event_count == 4
         case event
         when "return", "line", "end"
            yield binding
            set_trace_func(nil)
         else
            error_msg = "\n" <<
            "Invalid use of binding_of_caller. One of the following:\n" <<
            "  (1) statements exist after the binding_of_caller block;\n" <<
            "  (2) the method using binding_of_caller appears inside\n" <<
            "      a method call;\n" <<
            "  (3) the method using binding_of_caller is called from the\n" << 
            "      last line of a block or global scope.\n" <<
            "See the documentation for binding_of_caller.\n"
            cont.call(nil, lambda { raise(ScriptError, error_msg) })
         end
      end
   end

   cont, error = callcc { |cc| cc }
   if cont
      set_trace_func(tracer)
   else
      error.call 
   end
end