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import sys
import traceback
class PythonExecutionContext(object):
"""
A class representing an independent execution context.
It can store global symbols for the scripts executed herein, and
has functions to run and evaluate python code.
"""
def __init__(self):
self._exec_dict = {}
def __setitem__(self,name,value):
"""
Set a symbol into the execution context dictionary.
"""
self._exec_dict[name] = value
def __getitem__(self,name):
"""
Get a symbol from the execution context dictionary.
"""
return self._exec_dict[name]
def __contains__(self,name):
"""
See if the execution context holds some symbol.
"""
return name in self._exec_dict
def RunFromFile(self,filename):
"""
Run a script into this execution context directly from a file.
"""
def printerr(error):
print " * "+filename+": "+error
f = open(filename,"r")
self.RunUserCode(f.read(),printerr)
f.close()
def RunUserCode(self, script, printfunc,mode="single"):
"""
Run some text (python code) into this execution context.
"""
assigned_object = None # if we make a print we also return the printed eval
# Try and run the user entered line(s)
try:
if script.startswith("print"):
try:
assigned_object = eval(script[5:].strip(),self._exec_dict)
except:
traceback.print_exc()
exec(script,self._exec_dict)
except: # Prints the REAL exception.
error = '%s: %s' % (sys.exc_type.__name__, sys.exc_value)
for errorLine in error.split('\n'):
printfunc(errorLine+"\n") # new line to type into
#traceback.print_exc()
return assigned_object
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