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# encoding: utf-8
"""IO capturing utilities."""
# Copyright (c) IPython Development Team.
# Distributed under the terms of the Modified BSD License.
from __future__ import print_function, absolute_import
import sys
from IPython.utils.py3compat import PY3
if PY3:
from io import StringIO
else:
from StringIO import StringIO
#-----------------------------------------------------------------------------
# Classes and functions
#-----------------------------------------------------------------------------
class RichOutput(object):
def __init__(self, data=None, metadata=None, transient=None, update=False):
self.data = data or {}
self.metadata = metadata or {}
self.transient = transient or {}
self.update = update
def display(self):
from IPython.display import publish_display_data
publish_display_data(data=self.data, metadata=self.metadata,
transient=self.transient, update=self.update)
def _repr_mime_(self, mime):
if mime not in self.data:
return
data = self.data[mime]
if mime in self.metadata:
return data, self.metadata[mime]
else:
return data
def _repr_html_(self):
return self._repr_mime_("text/html")
def _repr_latex_(self):
return self._repr_mime_("text/latex")
def _repr_json_(self):
return self._repr_mime_("application/json")
def _repr_javascript_(self):
return self._repr_mime_("application/javascript")
def _repr_png_(self):
return self._repr_mime_("image/png")
def _repr_jpeg_(self):
return self._repr_mime_("image/jpeg")
def _repr_svg_(self):
return self._repr_mime_("image/svg+xml")
class CapturedIO(object):
"""Simple object for containing captured stdout/err and rich display StringIO objects
Each instance `c` has three attributes:
- ``c.stdout`` : standard output as a string
- ``c.stderr`` : standard error as a string
- ``c.outputs``: a list of rich display outputs
Additionally, there's a ``c.show()`` method which will print all of the
above in the same order, and can be invoked simply via ``c()``.
"""
def __init__(self, stdout, stderr, outputs=None):
self._stdout = stdout
self._stderr = stderr
if outputs is None:
outputs = []
self._outputs = outputs
def __str__(self):
return self.stdout
@property
def stdout(self):
"Captured standard output"
if not self._stdout:
return ''
return self._stdout.getvalue()
@property
def stderr(self):
"Captured standard error"
if not self._stderr:
return ''
return self._stderr.getvalue()
@property
def outputs(self):
"""A list of the captured rich display outputs, if any.
If you have a CapturedIO object ``c``, these can be displayed in IPython
using::
from IPython.display import display
for o in c.outputs:
display(o)
"""
return [ RichOutput(**kargs) for kargs in self._outputs ]
def show(self):
"""write my output to sys.stdout/err as appropriate"""
sys.stdout.write(self.stdout)
sys.stderr.write(self.stderr)
sys.stdout.flush()
sys.stderr.flush()
for kargs in self._outputs:
RichOutput(**kargs).display()
__call__ = show
class capture_output(object):
"""context manager for capturing stdout/err"""
stdout = True
stderr = True
display = True
def __init__(self, stdout=True, stderr=True, display=True):
self.stdout = stdout
self.stderr = stderr
self.display = display
self.shell = None
def __enter__(self):
from IPython.core.getipython import get_ipython
from IPython.core.displaypub import CapturingDisplayPublisher
from IPython.core.displayhook import CapturingDisplayHook
self.sys_stdout = sys.stdout
self.sys_stderr = sys.stderr
if self.display:
self.shell = get_ipython()
if self.shell is None:
self.save_display_pub = None
self.display = False
stdout = stderr = outputs = None
if self.stdout:
stdout = sys.stdout = StringIO()
if self.stderr:
stderr = sys.stderr = StringIO()
if self.display:
self.save_display_pub = self.shell.display_pub
self.shell.display_pub = CapturingDisplayPublisher()
outputs = self.shell.display_pub.outputs
self.save_display_hook = sys.displayhook
sys.displayhook = CapturingDisplayHook(shell=self.shell,
outputs=outputs)
return CapturedIO(stdout, stderr, outputs)
def __exit__(self, exc_type, exc_value, traceback):
sys.stdout = self.sys_stdout
sys.stderr = self.sys_stderr
if self.display and self.shell:
self.shell.display_pub = self.save_display_pub
sys.displayhook = self.save_display_hook
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