23
23
This module provides functions for tutorial and worksheet computations.
26
from storm.locals import And, Asc, Desc, Store
26
from storm.locals import And, Asc, Desc
29
27
import ivle.database
30
from ivle.database import ExerciseAttempt, ExerciseSave, Worksheet, \
31
WorksheetExercise, Exercise
28
from ivle.database import ExerciseAttempt, ExerciseSave, Worksheet
33
30
__all__ = ['get_exercise_status', 'get_exercise_stored_text',
34
31
'get_exercise_attempts', 'get_exercise_attempt',
37
def get_exercise_status(store, user, worksheet_exercise, as_of=None):
34
def get_exercise_status(store, user, worksheet_exercise):
38
35
"""Given a storm.store, User and Exercise, returns information about
39
36
the user's performance on that problem.
40
@param store: A storm.store
42
@param worksheet_exercise: An Exercise.
43
@param as_of: Optional datetime. If supplied, gets the status as of as_of.
44
37
Returns a tuple of:
45
38
- A boolean, whether they have successfully passed this exercise.
46
39
- An int, the number of attempts they have made up to and
168
159
saved.date = date
169
160
saved.text = text
171
def calculate_score(store, user, worksheet, as_of=None):
162
def calculate_score(store, user, worksheet):
173
164
Given a storm.store, User, Exercise and Worksheet, calculates a score for
174
165
the user on the given worksheet.
175
@param store: A storm.store
177
@param worksheet: A Worksheet.
178
@param as_of: Optional datetime. If supplied, gets the score as of as_of.
179
166
Returns a 4-tuple of ints, consisting of:
180
167
(No. mandatory exercises completed,
181
168
Total no. mandatory exercises,
203
190
if done: mand_done += 1
205
192
return mand_done, mand_total, opt_done, opt_total
207
def calculate_mark(mand_done, mand_total):
208
"""Calculate a subject mark, given the result of all worksheets.
209
@param mand_done: The total number of mandatory exercises completed by
210
some student, across all worksheets.
211
@param mand_total: The total number of mandatory exercises across all
212
worksheets in the offering.
213
@return: (percent, mark, mark_total)
214
percent: The percentage of exercises the student has completed, as an
215
integer between 0 and 100 inclusive.
216
mark: The mark the student has received, based on the percentage.
217
mark_total: The total number of marks available (currently hard-coded
220
# We want to display a students mark out of 5. However, they are
221
# allowed to skip 1 in 5 questions and still get 'full marks'.
222
# Hence we divide by 16, essentially making 16 percent worth
223
# 1 star, and 80 or above worth 5.
225
percent_int = (100 * mand_done) // mand_total
227
# Avoid Div0, just give everyone 0 marks if there are none available
229
# percent / 16, rounded down, with a maximum mark of 5
231
mark = min(percent_int // 16, max_mark)
232
return (percent_int, mark, max_mark)
234
def update_exerciselist(worksheet):
235
"""Runs through the worksheetstream, generating the appropriate
236
WorksheetExercises, and de-activating the old ones."""
238
# Turns the worksheet into an xml stream, and then finds all the
239
# exercise nodes in the stream.
240
worksheetdata = genshi.XML(worksheet.get_xml())
241
for kind, data, pos in worksheetdata:
242
if kind is genshi.core.START:
243
# Data is a tuple of tag name and a list of name->value tuples
244
if data[0] == 'exercise':
250
if attr[0] == 'optional':
251
optional = attr[1] == 'true'
253
exercises.append((src, optional))
255
# Set all current worksheet_exercises to be inactive
256
db_worksheet_exercises = Store.of(worksheet).find(WorksheetExercise,
257
WorksheetExercise.worksheet_id == worksheet.id)
258
for worksheet_exercise in db_worksheet_exercises:
259
worksheet_exercise.active = False
261
for exerciseid, optional in exercises:
262
worksheet_exercise = Store.of(worksheet).find(WorksheetExercise,
263
WorksheetExercise.worksheet_id == worksheet.id,
264
Exercise.id == WorksheetExercise.exercise_id,
265
Exercise.id == exerciseid).one()
266
if worksheet_exercise is None:
267
exercise = Store.of(worksheet).find(Exercise,
268
Exercise.id == exerciseid
272
worksheet_exercise = WorksheetExercise()
273
worksheet_exercise.worksheet_id = worksheet.id
274
worksheet_exercise.exercise_id = exercise.id
275
Store.of(worksheet).add(worksheet_exercise)
276
worksheet_exercise.active = True
277
worksheet_exercise.seq_no = ex_num
278
worksheet_exercise.optional = optional