def Diff(self):
#Validate if the Diff may proceed (Both JSONs must be valid)
if self.isLeftValid() == "false":
return "Left is not a valid JSON"
elif self.isRightValid() == "false":
return "Right is not a valid JSON"
diffInstance = difflib.Differ()
diffList = list(diffInstance.compare(self.decodedleft.splitlines(), self.decodedright.splitlines()))
bytesread = 0
count = 1
#Create a new Diff Result
#Set decoded values for comparison laters
diffresult = DiffResult()
diffresult.decodedleft = self.decodedleft
diffresult.decodedright = self.decodedright
#only compare offsets if contents are different and size is the same
if (self.left != self.right) and (len(self.decodedleft) == len(self.decodedright)):
#Initiate a new Offset
offset = Offset()
#Save the differences in a list of offset
for line in diffList:
#if it found a difference
if line[0] == '?':
offset.line= count - (len(diffresult.offsets) +1 )
offset.start = bytesread + line.index('^')
offset.size = line.count('^')
#add the offset in the list
diffresult.offsets.append(Offset(offset.line, offset.start, offset.size))
#sum total of bytes read to calculate the offset position
bytesread=bytesread+len(line)
#sum the number of lines read
count=count+1
print
#Unfortunately, all the attempts to serialize the list in JSON have failed..
#I will try it more in a future version
#For now, I will proceed with a not elegant way to convert it into JSON
return diffresult.__str__()
def test_DiffSameSizeDiffContents(self):
diffresult = DiffResult()
diffresult.decodedleft = validJSON
diffresult.decodedright= validJSON[:-1] + "*" #Change the last char and keep the same size
#create few offsets
offsets = list()
offset = Offset()
offsets.append(Offset(10,100,2))
offsets.append(Offset(20,400,3))
offsets.append(Offset(25,460,1))
diffresult.offsets = offsets
self.assertEqual(diffresult.__str__(), diffresult.GetEqualSizeDiffResultMsg(),"Expected diff result message for diff json contents with same size")
def test_DiffSizeMsg(self):
diffresult = DiffResult()
diffresult.decodedleft = validJSON
diffresult.decodedright= validJSON + "aaa" #adding 3 bytes
self.assertEqual(diffresult.__str__(), diffresult.GetDifferentSizeMsg(),"Expected different size message for different json sizes")
def test_EqualResultMsg(self):
diffresult = DiffResult()
diffresult.decodedleft = validJSON
diffresult.decodedright= validJSON
self.assertEqual(diffresult.__str__(), diffresult.GetEqualResultMsg(),"Expected equal result message for same json contents")