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#!/usr/bin/python3
class Action:
# type ∈ ['insert', 'remove', 'solve', 'solve_all', 'next', 'stop', 'test', 'hint']
# time: absolute elapsed time since the attempt started, in ms
# offset: position of the first inserted/removed character
# text: inserted/removed text or query
# total, passed: number of test cases
def __init__(self, type, time, offset=0, text='', total=0, passed=0):
self.type = type
self.time = time
if type == 'insert' or type == 'remove':
self.offset = offset
self.length = len(text)
self.text = text
elif type == 'solve' or type == 'solve_all':
self.query = text
elif type == 'test':
self.total = total
self.passed = passed
def __str__(self):
s = 't = ' + str(self.time/1000.0) + ' ' + self.type
if self.type in ('insert', 'remove'):
s += ' "' + self.text.replace('\n', '\\n').replace('\t', '\\t') + '" at ' + str(self.offset)
elif self.type in ('solve', 'solve_all'):
s += ' "' + self.query + '"'
elif self.type == 'test':
s += ' {0} / {1}'.format(self.passed, self.total)
return s
# apply this action to text
def apply(self, text):
if self.type == 'insert':
return text[:self.offset] + self.text + text[self.offset:]
elif self.type == 'remove':
return text[:self.offset] + text[self.offset+self.length:]
else:
return text
# reverse the application of this action
def unapply(self, text):
if self.type == 'insert':
return text[:self.offset] + text[self.offset+self.length:]
elif self.type == 'remove':
return text[:self.offset] + self.text + text[self.offset:]
else:
return text
_packet_action_map = {
'ins': lambda packet, time, code: Action('insert', time, offset=packet['off'], text=packet['txt']),
'rm': lambda packet, time, code: Action('remove', time, offset=packet['off'], text=packet['txt']),
'tst': lambda packet, time, code: Action('test', time, total=packet['tot'], passed=packet['pas']),
'hnt': lambda packet, time, code: Action('hint', time),
'slva': lambda packet, time, code: Action('solve_all', time, text=packet['qry']),
'prolog_query': lambda packet, time, code: Action('prolog_query', time, text=packet['qry']),
'prolog_next': lambda packet, time, code: Action('next', time),
'prolog_end': lambda packet, time, code: Action('stop', time),
}
# parse log from database into a list of actions, cleaning up some fluff.
# ignore non-text actions (queries and tests)
def parse(data):
if data == None:
return [], []
actions = []
incorrect = set()
time = 0
code = ''
for packet in data:
try:
time += packet['dt']
action = _packet_action_map[packet['typ']](packet, time, code)
except:
# ignore any errors while decoding a packet
continue
# skip normalization if this is the first action
if actions == []:
actions.append(action)
code = action.apply(code)
continue
# add to list of actions; modify previously added action if necessary
prev = actions[-1]
# remove superfluous REMOVE action when newline is inserted (due to editor auto-indent)
if prev.type == 'remove' and action.type == 'insert' and \
action.time == prev.time and \
action.offset == prev.offset and action.length > prev.length and \
action.text[action.length-prev.length:] == prev.text:
# discard last REMOVE action
code = prev.unapply(code)
actions.pop()
# replace current action with something better
length = action.length - prev.length
new = Action('insert', prev.time, offset = prev.offset, text = action.text[:length])
actions.append(new)
code = new.apply(code)
# remove superfluous INSERT action when newline is removed (due to editor auto-indent)
elif prev.type == 'remove' and action.type == 'insert' and \
action.time == prev.time and \
action.offset == prev.offset and action.length < prev.length and \
prev.text[prev.length-action.length:] == action.text:
# discard last INSERT action
code = prev.unapply(code)
actions.pop()
# replace current action with something better
length = prev.length - action.length
new = Action('remove', prev.time, offset = prev.offset, text = prev.text[:length])
actions.append(new)
code = new.apply(code)
# discard INSERT/REMOVE pairs (typos)
elif prev.type == 'insert' and action.type == 'remove' and \
action.time - prev.time < 10000 and \
action.offset == prev.offset and action.text == prev.text:
# discard last and current actions
code = prev.unapply(code)
actions.pop()
# discard REMOVE/INSERT pairs (deleted char then typed back)
elif prev.type == 'remove' and action.type == 'insert' and \
action.offset == prev.offset and action.text == prev.text:
# discard last and current actions
code = prev.unapply(code)
actions.pop()
# otherwise, simply append the current action
else:
actions.append(action)
code = action.apply(code)
return actions
# expand any multi-char actions (does not do anything for the 99%)
def expand(actions):
i = 0
while i < len(actions):
if actions[i].type == 'insert' and len(actions[i].text) > 1:
a = actions.pop(i)
for offset in range(len(a.text)):
actions.insert(i+offset, Action('insert', a.time, a.offset+offset, a.text[offset]))
i += len(a.text)
elif actions[i].type == 'remove' and len(actions[i].text) > 1:
a = actions.pop(i)
for offset in range(len(a.text)):
actions.insert(i, Action('remove', a.time, a.offset+offset, a.text[offset]))
i += len(a.text)
else:
i += 1
# each action in parse() result corresponds to single insertion/deletion.
# this function merges related adjacent actions
def compress(actions):
# first make each edit change exactly one character, for easier handling
expand(actions)
i = 0
while i < len(actions)-1:
a = actions[i]
b = actions[i+1]
# merge adjacent INSERT actions
# +a +b → +ab
if a.type == 'insert' and b.type == 'insert' and \
b.offset == a.offset + a.length: #and b.time - a.time < 10000:
a.text += b.text
a.length += b.length
del actions[i+1]
# merge adjacent REMOVE actions (two cases: backspace & delete)
# -b -a → -ab
elif a.type == 'remove' and b.type == 'remove' and \
b.offset == a.offset - b.length: #and b.time - a.time < 10000:
a.text = b.text + a.text
a.offset = b.offset
a.length += b.length
del actions[i+1]
# -a -b → -ab
elif a.type == 'remove' and b.type == 'remove' and \
b.offset == a.offset and b.time - a.time < 10000:
a.text += b.text
a.length += b.length
del actions[i+1]
# merge adjacent INSERT/REMOVE actions
# +ab -b → +a
elif a.type == 'insert' and b.type == 'remove' and \
b.offset >= a.offset and b.offset < a.offset + a.length and \
b.length == a.offset + a.length - b.offset and b.time - a.time < 10000:
del_start = b.offset - a.offset
del_end = del_start + b.length
a.text = a.text[:del_start] + a.text[del_end:]
a.length -= b.length
del actions[i+1]
else:
i += 1
# some sample code
if __name__ == '__main__':
import sys, os.path
sys.path.append(os.path.dirname(os.path.realpath(__file__)) + '/..') # the parent directory is the app directory
from db.models import Problem, Solution
# print all problem ids
print('problems:')
for problem in Problem.list():
print(' {}\t{}'.format(problem.id, problem.identifier))
print()
pid = input('enter problem id: ')
# print all attempt ids for the selected problem
print('users solving problem ' + str(pid) + ':')
attempts = Solution.filter(problem_id=pid)
print(', '.join([str(attempt.codeq_user_id) for attempt in attempts]))
print()
uid = input('enter user id: ')
attempt = Solution.get(problem_id=pid, codeq_user_id=uid)
try:
actions = parse(attempt.trace)
print('read ' + str(len(actions)) + ' actions from log')
compress(actions)
print('after compression: ' + str(len(actions)) + ' actions')
print()
print('code versions for this attempt:')
code = ''
for action in actions:
code = action.apply(code)
print(action)
print(code.strip())
print()
except Exception as ex:
sys.stderr.write('Error parsing action log: ' + str(ex))
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