text: import sys
  import decimal
  from unittest import TestCase
  
  import simplejson.decoder
  
  class TestScanString(TestCase):
      def test_py_scanstring(self):
          self._test_scanstring(simplejson.decoder.py_scanstring)
  
      def test_c_scanstring(self):
          if not simplejson.decoder.c_scanstring:
              return
          self._test_scanstring(simplejson.decoder.c_scanstring)
  
      def _test_scanstring(self, scanstring):
          self.assertEquals(
              scanstring('"z\\ud834\\udd20x"', 1, None, True),
              (u'z\U0001d120x', 16))
  
          if sys.maxunicode == 65535:
              self.assertEquals(
                  scanstring(u'"z\U0001d120x"', 1, None, True),
                  (u'z\U0001d120x', 6))
          else:
              self.assertEquals(
                  scanstring(u'"z\U0001d120x"', 1, None, True),
                  (u'z\U0001d120x', 5))
  
          self.assertEquals(
              scanstring('"\\u007b"', 1, None, True),
              (u'{', 8))
  
          self.assertEquals(
              scanstring('"A JSON payload should be an object or array, not a string."', 1, None, True),
              (u'A JSON payload should be an object or array, not a string.', 60))
          
          self.assertEquals(
              scanstring('["Unclosed array"', 2, None, True),
              (u'Unclosed array', 17))
          
          self.assertEquals(
              scanstring('["extra comma",]', 2, None, True),
              (u'extra comma', 14))
          
          self.assertEquals(
              scanstring('["double extra comma",,]', 2, None, True),
              (u'double extra comma', 21))
          
          self.assertEquals(
              scanstring('["Comma after the close"],', 2, None, True),
              (u'Comma after the close', 24))
          
          self.assertEquals(
              scanstring('["Extra close"]]', 2, None, True),
              (u'Extra close', 14))
          
          self.assertEquals(
              scanstring('{"Extra comma": true,}', 2, None, True),
              (u'Extra comma', 14))
          
          self.assertEquals(
              scanstring('{"Extra value after close": true} "misplaced quoted value"', 2, None, True),
              (u'Extra value after close', 26))
          
          self.assertEquals(
              scanstring('{"Illegal expression": 1 + 2}', 2, None, True),
              (u'Illegal expression', 21))
          
          self.assertEquals(
              scanstring('{"Illegal invocation": alert()}', 2, None, True),
              (u'Illegal invocation', 21))
          
          self.assertEquals(
              scanstring('{"Numbers cannot have leading zeroes": 013}', 2, None, True),
              (u'Numbers cannot have leading zeroes', 37))
          
          self.assertEquals(
              scanstring('{"Numbers cannot be hex": 0x14}', 2, None, True),
              (u'Numbers cannot be hex', 24))
          
          self.assertEquals(
              scanstring('[[[[[[[[[[[[[[[[[[[["Too deep"]]]]]]]]]]]]]]]]]]]]', 21, None, True),
              (u'Too deep', 30))
          
          self.assertEquals(
              scanstring('{"Missing colon" null}', 2, None, True),
              (u'Missing colon', 16))
          
          self.assertEquals(
              scanstring('{"Double colon":: null}', 2, None, True),
              (u'Double colon', 15))
          
          self.assertEquals(
              scanstring('{"Comma instead of colon", null}', 2, None, True),
              (u'Comma instead of colon', 25))
          
          self.assertEquals(
              scanstring('["Colon instead of comma": false]', 2, None, True),
              (u'Colon instead of comma', 25))
          
          self.assertEquals(
              scanstring('["Bad value", truth]', 2, None, True),
              (u'Bad value', 12))
  