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import pydevd_constants #@UnusedImport -- defines False and True if not there.
IS_PY3K = pydevd_constants.IS_PY3K
class IORedirector:
'''This class works to redirect the write function to many streams
'''
def __init__(self, *args):
self._redirectTo = args
def write(self, s):
for r in self._redirectTo:
try:
r.write(s)
except:
pass
def isatty(self):
return False
def flush(self):
for r in self._redirectTo:
r.flush()
def __getattr__(self, name):
for r in self._redirectTo:
if hasattr(r, name):
return r.__getattribute__(name)
raise AttributeError(name)
class IOBuf:
'''This class works as a replacement for stdio and stderr.
It is a buffer and when its contents are requested, it will erase what
it has so far so that the next return will not return the same contents again.
'''
def __init__(self):
self.buflist = []
import os
self.encoding = os.environ.get('PYTHONIOENCODING', 'utf-8')
def getvalue(self):
b = self.buflist
self.buflist = [] #clear it
return ''.join(b)
def write(self, s):
if not IS_PY3K:
if isinstance(s, unicode):
s = s.encode(self.encoding)
self.buflist.append(s)
def isatty(self):
return False
def flush(self):
pass
class _RedirectionsHolder:
_stack_stdout = []
_stack_stderr = []
def StartRedirect(keep_original_redirection=False, std='stdout'):
'''
@param std: 'stdout', 'stderr', or 'both'
'''
import sys
buf = IOBuf()
if std == 'both':
config_stds = ['stdout', 'stderr']
else:
config_stds = [std]
for std in config_stds:
original = getattr(sys, std)
stack = getattr(_RedirectionsHolder, '_stack_%s' % std)
stack.append(original)
if keep_original_redirection:
setattr(sys, std, IORedirector(buf, getattr(sys, std)))
else:
setattr(sys, std, buf)
return buf
def EndRedirect(std='stdout'):
import sys
if std == 'both':
config_stds = ['stdout', 'stderr']
else:
config_stds = [std]
for std in config_stds:
stack = getattr(_RedirectionsHolder, '_stack_%s' % std)
setattr(sys, std, stack.pop())
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