source: publico/il.spdo/trunk/Paste-1.7.5.1-py2.6.egg/paste/evalexception/evalcontext.py @ 5327

Última Alteração nesse arquivo desde 5327 foi 5327, incluída por fabianosantos, 8 anos atrás

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1# (c) 2005 Ian Bicking and contributors; written for Paste (http://pythonpaste.org)
2# Licensed under the MIT license: http://www.opensource.org/licenses/mit-license.php
3from cStringIO import StringIO
4import traceback
5import threading
6import pdb
7import sys
8
9exec_lock = threading.Lock()
10
11class EvalContext(object):
12
13    """
14    Class that represents a interactive interface.  It has its own
15    namespace.  Use eval_context.exec_expr(expr) to run commands; the
16    output of those commands is returned, as are print statements.
17
18    This is essentially what doctest does, and is taken directly from
19    doctest.
20    """
21
22    def __init__(self, namespace, globs):
23        self.namespace = namespace
24        self.globs = globs
25
26    def exec_expr(self, s):
27        out = StringIO()
28        exec_lock.acquire()
29        save_stdout = sys.stdout
30        try:
31            debugger = _OutputRedirectingPdb(save_stdout)
32            debugger.reset()
33            pdb.set_trace = debugger.set_trace
34            sys.stdout = out
35            try:
36                code = compile(s, '<web>', "single", 0, 1)
37                exec code in self.namespace, self.globs
38                debugger.set_continue()
39            except KeyboardInterrupt:
40                raise
41            except:
42                traceback.print_exc(file=out)
43                debugger.set_continue()
44        finally:
45            sys.stdout = save_stdout
46            exec_lock.release()
47        return out.getvalue()
48
49# From doctest
50class _OutputRedirectingPdb(pdb.Pdb):
51    """
52    A specialized version of the python debugger that redirects stdout
53    to a given stream when interacting with the user.  Stdout is *not*
54    redirected when traced code is executed.
55    """
56    def __init__(self, out):
57        self.__out = out
58        pdb.Pdb.__init__(self)
59
60    def trace_dispatch(self, *args):
61        # Redirect stdout to the given stream.
62        save_stdout = sys.stdout
63        sys.stdout = self.__out
64        # Call Pdb's trace dispatch method.
65        try:
66            return pdb.Pdb.trace_dispatch(self, *args)
67        finally:
68            sys.stdout = save_stdout
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