def build_random_string_insert(self):
doc = self.doc
snapshot = doc.get_snapshot()
val = ''
if len(self.remaining_chars) < 4:
val = self.remaining_chars
else:
# pick random sample size
k = random.choice(xrange(2, 5))
# pick random letters
val = ''.join(random.sample(self.remaining_chars, k))
# pick random insertion point
offset = random.choice(xrange(len(snapshot) + 1))
# The inserted characters should appear after any existing character
# before the offset
previous_chars = snapshot[:offset]
for char in previous_chars:
self.results[char]['after'].extend(list(val))
# The inserted characters should appear before any existing character
# after the insertion
subsequent_chars = snapshot[offset:]
for char in subsequent_chars:
self.results[char]['before'].extend(list(val))
for i, char in enumerate(val):
r = self.results[char]
r['before'] = list(snapshot[:offset])
r['before'].extend(list(val[:i]))
r['after'] = list(snapshot[offset:])
r['after'].extend(list(val[i + 1:]))
self.remaining_chars = self.remaining_chars.replace(char, '')
op = Op('si', [], offset=offset, val=val)
op.cheat = previous_chars + " " + val + " " + subsequent_chars
return op
def build_random_string_delete(self):
doc = self.doc
snapshot = doc.get_snapshot()
# pick random offset
offset = 0
if len(snapshot) > 1:
offset = random.choice(xrange(len(snapshot)))
# get random size for delete range
characters_past_offset = len(snapshot[offset:])
max_val = min(5, characters_past_offset)
val = 0
# as long as there is something in the snapshot, pick a delete size
# larger than zero
if characters_past_offset != 0:
val = random.choice(xrange(max_val)) + 1
deleted_chars = snapshot[offset:offset + val]
for char in deleted_chars:
self.results[char]['deleted'] = True
op = Op('sd', [], offset=offset, val=val)
op.cheat = "delete " + deleted_chars
return op
