def makeReplacement(self, currentDocumentOrig):
currentDocument = copy.deepcopy(currentDocumentOrig)
modifiedDocumentText = currentDocument.documentTrailingSpacesWords
modifiedDocumentWordReplacementsDict = currentDocument.wordReplacementsDict
modifiedDocumentAvailableReplacements = currentDocument.availableReplacements
replacementsCount = math.floor(
self.replacements *
len(currentDocument.documentTrailingSpacesWords))
# Skipping for the mutant
# if len(modifiedDocumentWordReplacementsDict) > self.replacementsLimit * len(modifiedDocumentText):
# return currentDocumentOrig
i = 0
while i < replacementsCount:
# If the available replacements dictionary is empty then stop the process for this mutant
# and return the parent
try:
randomPosition = random.choice(
modifiedDocumentAvailableReplacements)
except:
return currentDocumentOrig
# To make sure that a word chose once is never chosen again
try:
(randomWord,
posTag) = currentDocumentOrig.documentTrailingSpacesWords[
randomPosition]
except Exception as e:
modifiedDocumentAvailableReplacements.remove(randomPosition)
continue
if posTag not in self.allowedPOStags:
modifiedDocumentAvailableReplacements.remove(randomPosition)
continue
if randomWord[-1] == ' ':
tempRandomWord = randomWord[:-1]
try:
replacement = random.choice(
self.neighboursDictionary[tempRandomWord])
except:
modifiedDocumentAvailableReplacements.remove(
randomPosition)
continue
replacementPOSTag = getPOStag(replacement)
replacement = replacement + ' '
else:
tempRandomWord = randomWord
try:
replacement = random.choice(
self.neighboursDictionary[tempRandomWord])
except:
modifiedDocumentAvailableReplacements.remove(
randomPosition)
continue
replacementPOSTag = getPOStag(replacement)
modifiedDocumentText[randomPosition] = (replacement,
replacementPOSTag)
try:
modifiedDocumentWordReplacementsDict[randomPosition].append(
(randomWord, replacement))
# print(modifiedDocumentWordReplacementsDict[randomPosition])
except KeyError:
modifiedDocumentWordReplacementsDict[randomPosition] = [
(randomWord, replacement)
]
i += 1
updatedText = ''
for i in range(len(modifiedDocumentText)):
(reqWord, _) = modifiedDocumentText[i]
updatedText += reqWord
modifiedDocument = Document(updatedText)
modifiedDocument.wordReplacementsDict.update(
modifiedDocumentWordReplacementsDict)
modifiedDocument.availableReplacements = modifiedDocumentAvailableReplacements
return modifiedDocument
