294 lines
9.8 KiB
Python
294 lines
9.8 KiB
Python
import random, numpy, math, scipy, sys, StringIO, os, struct, json
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from x_module import XModule
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from capa_problem import LoncapaProblem
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from django.http import Http404
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import dateutil
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import datetime
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import content_parser
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from lxml import etree
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## TODO: Abstract out from Django
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from django.conf import settings
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from djangomako.shortcuts import render_to_response, render_to_string
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class LoncapaModule(XModule):
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''' Interface between capa_problem and x_module. Originally a hack
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meant to be refactored out, but it seems to be serving a useful
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prupose now. We can e.g .destroy and create the capa_problem on a
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reset.
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'''
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xml_tags = ["problem"]
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id_attribute = "filename"
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def get_state(self):
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state = self.lcp.get_state()
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state['attempts'] = self.attempts
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return json.dumps(state)
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def get_score(self):
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return self.lcp.get_score()
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def max_score(self):
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return len(self.lcp.questions)
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def get_html(self):
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return render_to_string('problem_ajax.html',
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{'id':self.filename,
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'ajax_url':self.ajax_url,
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})
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def get_init_js(self):
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return render_to_string('problem.js',
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{'id':self.filename,
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'ajax_url':self.ajax_url,
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})
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def get_problem_html(self, encapsulate=True):
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html = self.lcp.get_html()
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content={'name':self.name,
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'html':html}
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check_button = True
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reset_button = True
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save_button = True
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# If we're after deadline, or user has exhuasted attempts,
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# question is read-only.
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if self.closed():
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check_button = False
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reset_button = False
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save_button = False
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# User submitted a problem, and hasn't reset. We don't want
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# more submissions.
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if self.lcp.done and self.rerandomize:
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#print "!"
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check_button = False
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save_button = False
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# User hasn't submitted an answer yet -- we don't want resets
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if not self.lcp.done:
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reset_button = False
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attempts_str = ""
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if self.max_attempts != None:
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attempts_str = " ({a}/{m})".format(a=self.attempts, m=self.max_attempts)
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# Check if explanation is available, and if so, give a link
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explain=""
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if self.lcp.done and self.explain_available=='attempted':
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explain=self.explanation
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if self.closed() and self.explain_available=='closed':
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explain=self.explanation
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if len(explain) == 0:
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explain = False
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html=render_to_string('problem.html',
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{'problem' : content,
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'id' : self.filename,
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'check_button' : check_button,
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'reset_button' : reset_button,
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'save_button' : save_button,
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'answer_available' : self.answer_available(),
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'ajax_url' : self.ajax_url,
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'attempts': attempts_str,
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'explain': explain
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})
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if encapsulate:
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html = '<div id="main_{id}">'.format(id=self.item_id)+html+"</div>"
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return html
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def __init__(self, xml, item_id, ajax_url=None, track_url=None, state=None):
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XModule.__init__(self, xml, item_id, ajax_url, track_url, state)
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self.attempts = 0
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self.max_attempts = None
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self.due_date = None
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dom2 = etree.fromstring(xml)
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self.explanation=content_parser.item(dom2.xpath('/problem/@explain'), default="closed")
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self.explain_available=content_parser.item(dom2.xpath('/problem/@explain_available'))
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self.due_date=content_parser.item(dom2.xpath('/problem/@due'))
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if len(self.due_date)>0:
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self.due_date=dateutil.parser.parse(self.due_date)
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else:
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self.due_date=None
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self.max_attempts=content_parser.item(dom2.xpath('/problem/@attempts'))
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if len(self.max_attempts)>0:
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self.max_attempts=int(self.max_attempts)
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else:
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self.max_attempts=None
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self.show_answer=content_parser.item(dom2.xpath('/problem/@showanswer'))
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if self.show_answer=="":
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self.show_answer="closed"
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self.rerandomize=content_parser.item(dom2.xpath('/problem/@rerandomize'))
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if self.rerandomize=="":
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self.rerandomize=True
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elif self.rerandomize=="false":
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self.rerandomize=False
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elif self.rerandomize=="true":
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self.rerandomize=True
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else:
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raise Exception("Invalid rerandomize attribute "+self.rerandomize)
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if state!=None:
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state=json.loads(state)
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if state!=None and 'attempts' in state:
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self.attempts=state['attempts']
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self.filename=content_parser.item(dom2.xpath('/problem/@filename'))
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filename=settings.DATA_DIR+"problems/"+self.filename+".xml"
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self.name=content_parser.item(dom2.xpath('/problem/@name'))
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self.lcp=LoncapaProblem(filename, self.item_id, state)
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def handle_ajax(self, dispatch, get):
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if dispatch=='problem_get':
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response = self.get_problem(get)
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elif False: #self.due_date >
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return json.dumps({"error":"Past due date"})
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elif dispatch=='problem_check':
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response = self.check_problem(get)
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elif dispatch=='problem_reset':
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response = self.reset_problem(get)
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elif dispatch=='problem_save':
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response = self.save_problem(get)
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elif dispatch=='problem_show':
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response = self.get_answer(get)
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else:
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return "Error"
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return response
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def closed(self):
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''' Is the student still allowed to submit answers? '''
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if self.attempts == self.max_attempts:
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return True
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if self.due_date != None and datetime.datetime.utcnow() > self.due_date:
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return True
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return False
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def answer_available(self):
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''' Is the user allowed to see an answer?
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'''
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if self.show_answer == '':
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return False
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if self.show_answer == "never":
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return False
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if self.show_answer == 'attempted' and self.attempts == 0:
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return False
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if self.show_answer == 'attempted' and self.attempts > 0:
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return True
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if self.show_answer == 'answered' and self.lcp.done:
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return True
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if self.show_answer == 'answered' and not self.lcp.done:
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return False
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if self.show_answer == 'closed' and self.closed():
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return True
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if self.show_answer == 'closed' and not self.closed():
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return False
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print "aa", self.show_answer
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raise Http404
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def get_answer(self, get):
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if not self.answer_available():
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raise Http404
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else:
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return json.dumps(self.lcp.get_question_answers())
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# Figure out if we should move these to capa_problem?
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def get_problem(self, get):
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''' Same as get_problem_html -- if we want to reconfirm we
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have the right thing e.g. after several AJAX calls.'''
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return self.get_problem_html(encapsulate=False)
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def check_problem(self, get):
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''' Checks whether answers to a problem are correct, and
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returns a map of correct/incorrect answers'''
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# Too late. Cannot submit
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if self.closed():
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print "cp"
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raise Http404
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# Problem submitted. Student should reset before checking
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# again.
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if self.lcp.done and self.rerandomize:
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print "cpdr"
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raise Http404
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self.attempts = self.attempts + 1
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self.lcp.done=True
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answers=dict()
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# input_resistor_1 ==> resistor_1
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for key in get:
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answers['_'.join(key.split('_')[1:])]=get[key]
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correct_map = self.lcp.grade_answers(answers)
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success = True
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for i in correct_map:
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if correct_map[i]!='correct':
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success = False
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js=json.dumps({'correct_map' : correct_map,
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'success' : success})
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return js
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def save_problem(self, get):
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# Too late. Cannot submit
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if self.closed():
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print "sp"
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return "Problem is closed"
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# Problem submitted. Student should reset before saving
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# again.
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if self.lcp.done and self.rerandomize:
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print "spdr"
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return "Problem needs to be reset prior to save."
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answers=dict()
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for key in get:
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answers['_'.join(key.split('_')[1:])]=get[key]
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self.lcp.answers=answers
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return json.dumps({'success':True})
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def reset_problem(self, get):
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''' Changes problem state to unfinished -- removes student answers,
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and causes problem to rerender itself. '''
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if self.closed():
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return "Problem is closed"
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if not self.lcp.done:
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return "Refresh the page and make an attempt before resetting."
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self.lcp.done=False
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self.lcp.answers=dict()
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self.lcp.correct_map=dict()
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if self.rerandomize:
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self.lcp.context=dict()
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self.lcp.questions=dict() # Detailed info about questions in problem instance. TODO: Should be by id and not lid.
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self.lcp.seed=None
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filename=settings.DATA_DIR+"problems/"+self.filename+".xml"
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self.lcp=LoncapaProblem(filename, self.item_id, self.lcp.get_state())
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return json.dumps(self.get_problem_html(encapsulate=False))
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