root/galaxy-central/eggs/WebError-0.8a-py2.6.egg/weberror/evalexception/evalcontext.py

リビジョン 3, 1.9 KB (コミッタ: kohda, 14 年 前)

Install Unix tools  http://hannonlab.cshl.edu/galaxy_unix_tools/galaxy.html

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