def _extract_context(self, tree):
'''
Extract content of <script>...</script> from the problem.xml file, and exec it in the
context of this problem. Provides ability to randomize problems, and also set
variables for problem answer checking.
Problem XML goes to Python execution context. Runs everything in script tags.
'''
context = {}
context['seed'] = self.seed
all_code = ''
python_path = []
for script in tree.findall('.//script'):
stype = script.get('type')
if stype:
if 'javascript' in stype:
continue # skip javascript
if 'perl' in stype:
continue # skip perl
# TODO: evaluate only python
for d in self._extract_system_path(script):
if d not in python_path and os.path.exists(d):
python_path.append(d)
XMLESC = {"'": "'", """: '"'}
code = unescape(script.text, XMLESC)
all_code += code
if all_code:
try:
safe_exec.safe_exec(
all_code,
context,
random_seed=self.seed,
python_path=python_path,
cache=self.system.cache,
slug=self.problem_id,
)
except Exception as err:
log.exception("Error while execing script code: " + all_code)
msg = "Error while executing script code: %s" % str(
err).replace('<', '<')
raise responsetypes.LoncapaProblemError(msg)
# Store code source in context, along with the Python path needed to
# run it correctly.
context['script_code'] = all_code
context['python_path'] = python_path
return context
def _extract_context(self, tree):
'''
Extract content of <script>...</script> from the problem.xml file, and exec it in the
context of this problem. Provides ability to randomize problems, and also set
variables for problem answer checking.
Problem XML goes to Python execution context. Runs everything in script tags.
'''
context = {}
context['seed'] = self.seed
all_code = ''
python_path = []
for script in tree.findall('.//script'):
stype = script.get('type')
if stype:
if 'javascript' in stype:
continue # skip javascript
if 'perl' in stype:
continue # skip perl
# TODO: evaluate only python
for d in self._extract_system_path(script):
if d not in python_path and os.path.exists(d):
python_path.append(d)
XMLESC = {"'": "'", """: '"'}
code = unescape(script.text, XMLESC)
all_code += code
if all_code:
try:
safe_exec.safe_exec(
all_code,
context,
random_seed=self.seed,
python_path=python_path,
cache=self.system.cache,
slug=self.problem_id,
)
except Exception as err:
log.exception("Error while execing script code: " + all_code)
msg = "Error while executing script code: %s" % str(
err).replace('<', '<')
raise responsetypes.LoncapaProblemError(msg)
# Store code source in context, along with the Python path needed to
# run it correctly.
context['script_code'] = all_code
context['python_path'] = python_path
return context
def run_script(self, environment):
safe_exec(self._script, environment)
