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display_manager.py
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display_manager.py
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# -*- encoding: utf-8 -*-
r"""
Display Manager
This is the heart of the rich output system, the display manager
arbitrates between
* Backend capabilities: what can be displayed
* Backend preferences: what gives good quality on the backend
* Sage capabilities: every Sage object can only generate certain
representations, and
* User preferences: typeset vs. plain text vs. ascii art, etc.
The display manager is a singleton class, Sage always has exactly one
instance of it. Use :func:`get_display_manager` to obtain it.
EXAMPLES::
sage: from sage.repl.rich_output import get_display_manager
sage: dm = get_display_manager(); dm
The Sage display manager using the doctest backend
"""
#*****************************************************************************
# Copyright (C) 2015 Volker Braun <vbraun.name@gmail.com>
#
# Distributed under the terms of the GNU General Public License (GPL)
# as published by the Free Software Foundation; either version 2 of
# the License, or (at your option) any later version.
# http://www.gnu.org/licenses/
#*****************************************************************************
import warnings
from sage.structure.sage_object import SageObject
from sage.repl.rich_output.output_basic import (
OutputPlainText, OutputAsciiArt, OutputUnicodeArt, OutputLatex,
)
from sage.repl.rich_output.preferences import DisplayPreferences
class DisplayException(Exception):
"""
Base exception for all rich output-related exceptions.
EXAMPLES::
sage: from sage.repl.rich_output.display_manager import DisplayException
sage: raise DisplayException('foo')
Traceback (most recent call last):
...
DisplayException: foo
"""
pass
class OutputTypeException(DisplayException):
"""
Wrong Output container.
The output containers are the subclasses of
:class:`~sage.repl.rich_output.output_basic.OutputBase` that
contain the entire output. The display backends must create output
containers of a suitable type depending on the displayed Python
object. This exception indicates that there is a mistake in the
backend and it returned the wrong type of output container.
EXAMPLES::
sage: from sage.repl.rich_output.display_manager import OutputTypeException
sage: raise OutputTypeException('foo')
Traceback (most recent call last):
...
OutputTypeException: foo
"""
pass
class RichReprWarning(UserWarning):
"""
Warning that is throws if a call to ``_rich_repr_`` fails.
If an object implements ``_rich_repr_`` then it must return a
value, possibly ``None`` to indicate that no rich output can be
generated. But it may not raise an exception as it is very
confusing for the user if the displayhook fails.
EXAMPLES::
sage: from sage.repl.rich_output.display_manager import RichReprWarning
sage: raise RichReprWarning('foo')
Traceback (most recent call last):
...
RichReprWarning: foo
"""
pass
class restricted_output(object):
def __init__(self, display_manager, output_classes):
"""
Context manager to temporarily restrict the accepted output types
In the context, the output is restricted to the output
container types listed in ``output_classes``. Additionally,
display preferences are changed not not show graphics.
INPUT:
- ``display_manager`` -- the display manager.
- ``output_classes`` -- iterable of output container types.
EXAMPLES::
sage: from sage.repl.rich_output.display_manager import (
....: get_display_manager, restricted_output)
sage: dm = get_display_manager()
sage: restricted_output(dm, [dm.types.OutputPlainText])
<sage.repl.rich_output.display_manager.restricted_output object at 0x...>
"""
self._display_manager = display_manager
self._output_classes = frozenset(output_classes)
def __enter__(self):
"""
Enter the restricted output context
EXAMPLES::
sage: from sage.repl.rich_output.display_manager import (
....: get_display_manager, restricted_output)
sage: dm = get_display_manager()
sage: len(dm.supported_output()) > 1
True
sage: with restricted_output(dm, [dm.types.OutputPlainText]):
....: dm.supported_output()
frozenset({<class 'sage.repl.rich_output.output_basic.OutputPlainText'>})
sage: dm.preferences.supplemental_plot
'never'
sage: dm.preferences.supplemental_plot = 'always'
sage: with restricted_output(dm, [dm.types.OutputPlainText]):
....: dm.preferences
Display preferences:
* graphics = disable
* supplemental_plot = never
* text is not specified
sage: dm.preferences.supplemental_plot = 'never'
"""
dm = self._display_manager
self._original = dm._supported_output
dm._supported_output = self._output_classes
self._original_prefs = DisplayPreferences(dm.preferences)
dm.preferences.graphics = 'disable'
dm.preferences.supplemental_plot = 'never'
def __exit__(self, exception_type, value, traceback):
"""
Exit the restricted output context
EXAMPLES::
sage: from sage.repl.rich_output.display_manager import (
....: get_display_manager, restricted_output)
sage: dm = get_display_manager()
sage: with restricted_output(dm, [dm.types.OutputPlainText]):
....: assert len(dm.supported_output()) == 1
sage: assert len(dm.supported_output()) > 1
"""
dm = self._display_manager
dm._supported_output = self._original
dm.preferences.graphics = self._original_prefs.graphics
dm.preferences.supplemental_plot = self._original_prefs.supplemental_plot
class DisplayManager(SageObject):
_instance = None
def __init__(self):
"""
The Display Manager
Used to decide what kind of rich output is best.
EXAMPLES::
sage: from sage.repl.rich_output import get_display_manager
sage: get_display_manager()
The Sage display manager using the doctest backend
"""
assert DisplayManager._instance is None
DisplayManager._instance = self
from sage.repl.rich_output.backend_base import BackendSimple
self.switch_backend(BackendSimple())
@classmethod
def get_instance(cls):
"""
Get the singleton instance.
This class method is equivalent to
:func:`get_display_manager`.
OUTPUT:
The display manager singleton.
EXAMPLES::
sage: from sage.repl.rich_output.display_manager import DisplayManager
sage: DisplayManager.get_instance()
The Sage display manager using the doctest backend
"""
if cls._instance is not None:
return cls._instance
else:
return cls()
def _repr_(self):
"""
Return a string representation.
OUTPUT:
String.
EXAMPLES::
sage: from sage.repl.rich_output import get_display_manager
sage: get_display_manager()
The Sage display manager using the doctest backend
"""
s = 'The Sage display manager using the {0} backend'.format(self._backend)
return s
@property
def types(self):
"""
Catalog of all output container types.
Note that every output type must be registered in
:mod:`sage.repl.rich_output.output_catalog`.
OUTPUT:
Returns the :mod:`sage.repl.rich_output.output_catalog`
module.
EXAMPLES::
sage: from sage.repl.rich_output import get_display_manager
sage: dm = get_display_manager()
sage: dm.types.OutputPlainText
<class 'sage.repl.rich_output.output_basic.OutputPlainText'>
"""
import sage.repl.rich_output.output_catalog
return sage.repl.rich_output.output_catalog
def switch_backend(self, backend, **kwds):
"""
Switch to a new backend
INPUT:
- ``backend`` -- instance of
:class:`~sage.repl.rich_output.backend_base.BackendBase`.
- ``kwds`` -- optional keyword arguments that are passed on to
the
:meth:`~sage.repl.rich_output.backend_base.BackendBase.install`
method.
OUTPUT:
The previous backend.
EXAMPLES::
sage: from sage.repl.rich_output.backend_base import BackendSimple
sage: simple = BackendSimple()
sage: from sage.repl.rich_output import get_display_manager
sage: dm = get_display_manager(); dm
The Sage display manager using the doctest backend
sage: previous = dm.switch_backend(simple)
sage: dm
The Sage display manager using the simple backend
Restore the doctest backend::
sage: dm.switch_backend(previous) is simple
True
"""
from sage.repl.rich_output.backend_base import BackendBase
if not isinstance(backend, BackendBase):
raise ValueError('backend must be instance of BackendBase class')
supported = backend.supported_output()
if not any(issubclass(out, OutputPlainText) for out in supported):
raise ValueError('every backend must support plain text')
try:
self._backend.uninstall()
except AttributeError:
pass # first time we switch
# clear caches
self._output_promotions = dict()
self._supported_output = frozenset(
map(self._demote_output_class, backend.supported_output()))
# install new backend
try:
old_backend = self._backend
except AttributeError:
old_backend = None
self._backend = backend
self._backend.install(**kwds)
self._preferences = DisplayPreferences(self._backend.default_preferences())
return old_backend
@property
def preferences(self):
"""
Return the preferences.
OUTPUT:
The display preferences as instance of
:class:`~sage.repl.rich_output.preferences.DisplayPreferences`.
EXAMPLES::
sage: from sage.repl.rich_output import get_display_manager
sage: dm = get_display_manager()
sage: dm.preferences
Display preferences:
* graphics is not specified
* supplemental_plot = never
* text is not specified
"""
return self._preferences
def is_in_terminal(self):
"""
Test whether the UI is meant to run in a terminal
When this method returns ``True``, you can assume that it is
possible to use ``raw_input`` or launch external programs that
take over the input.
Otherwise, you should assume that the backend runs remotely or
in a pty controlled by another program. Then you should not
launch external programs with a (text or graphical) UI.
This is used to enable/disable interpreter consoles.
OUTPUT:
Boolean.
"""
return self._backend.is_in_terminal()
def check_backend_class(self, backend_class):
"""
Check that the current backend is an instance of
``backend_class``.
This is, for example, used by the Sage IPython display
formatter to ensure that the IPython backend is in use.
INPUT:
- ``backend_class`` -- type of a backend class.
OUTPUT:
This method returns nothing. A ``RuntimeError`` is raised if
``backend_class`` is not the type of the current backend.
EXAMPLES::
sage: from sage.repl.rich_output.backend_base import BackendSimple
sage: from sage.repl.rich_output import get_display_manager
sage: dm = get_display_manager()
sage: dm.check_backend_class(BackendSimple)
Traceback (most recent call last):
...
RuntimeError: check failed: current backend is invalid
"""
if not isinstance(self._backend, backend_class):
raise RuntimeError('check failed: current backend is invalid')
def _demote_output_class(self, output_class):
"""
Helper for :meth:`switch_backend`.
INPUT:
- ``output_class`` -- a possibly derived class from one of the
output container classes in :meth:`types`.
OUTPUT:
The underlying container class that it was derived from.
EXAMPLES::
sage: from sage.repl.rich_output import get_display_manager
sage: dm = get_display_manager()
sage: dm._demote_output_class(dm.types.OutputPlainText)
<class 'sage.repl.rich_output.output_basic.OutputPlainText'>
"""
from sage.repl.rich_output.output_basic import OutputBase
if not issubclass(output_class, OutputBase):
raise OutputTypeException(
'invalid output container type: {0} is not subclass of OutputBase'
.format(output_class))
result = None
for type_name in dir(self.types):
if type_name.startswith('_'):
continue
tp = getattr(self.types, type_name)
if not issubclass(tp, OutputBase):
continue
if issubclass(output_class, tp):
if result is not None:
raise OutputTypeException(
'{0} inherits from multiple output classes'
.format(output_class))
else:
self._output_promotions[tp] = output_class
result = tp
if result is None:
raise OutputTypeException(
'{0} does not inherit from any known output class'
.format(output_class))
return result
def _promote_output(self, output):
"""
Promote output container to a backend-specific subclass
INPUT:
- ``output`` -- instance of a subclass of
:class:`~sage.repl.rich_output.output_basic.OutputBase`. Backend-agnostic
output container.
OUTPUT:
If the backend returned a subclass of the type of ``output``:
promote the class to the subclass and return it. Otherwise,
the unchanged output is returned.
EXAMPLES::
sage: from sage.repl.rich_output import get_display_manager
sage: dm = get_display_manager()
sage: out = dm._promote_output(dm.types.OutputPlainText('test'))
sage: type(out)
<class 'sage.repl.rich_output.output_basic.OutputPlainText'>
"""
try:
specialized_class = self._output_promotions[type(output)]
except KeyError:
return output
output.__class__ = specialized_class
return output
def _preferred_text_formatter(self, obj, plain_text=None, **kwds):
"""
Return the preferred textual representation
INPUT:
- ``obj`` -- anything. The objects to format.
- ``plain_text`` -- ``None`` (default) or string. The plain
text representation. If specified, this will be used for
plain text output.
OUTPUT:
One of
:class:`~sage.repl.rich_output.output_basic.OutputPlainText`,
:class:`~sage.repl.rich_output.output_basic.OutputAsciiArt`,
or
:class:`~sage.repl.rich_output.output_basic.OutputLatex`
containing the preferred textual representation of ``obj``
supported by the backend.
EXAMPLES::
sage: from sage.repl.rich_output import get_display_manager
sage: dm = get_display_manager()
sage: dm.preferences.text is None
True
sage: dm._preferred_text_formatter([1/42])
OutputPlainText container
sage: dm.preferences.text = 'plain'
sage: dm._preferred_text_formatter([1/42])
OutputPlainText container
sage: dm.preferences.text = 'ascii_art'
sage: dm._preferred_text_formatter([1/42])
OutputAsciiArt container
sage: dm.preferences.text = 'unicode_art'
sage: dm._preferred_text_formatter([1/42])
OutputUnicodeArt container
sage: dm.preferences.text = 'latex'
sage: dm._preferred_text_formatter([1/42])
\newcommand{\Bold}[1]{\mathbf{#1}}\verb|OutputLatex|\phantom{\verb!x!}\verb|container|
sage: del dm.preferences.text # reset to default
"""
want = self.preferences.text
supported = self._backend.supported_output()
if want == 'ascii_art' and OutputAsciiArt in supported:
out = self._backend.ascii_art_formatter(obj, **kwds)
if type(out) is not OutputAsciiArt:
raise OutputTypeException('backend returned wrong output type, require AsciiArt')
return out
if want == 'unicode_art' and OutputUnicodeArt in supported:
out = self._backend.unicode_art_formatter(obj, **kwds)
if type(out) is not OutputUnicodeArt:
raise OutputTypeException('backend returned wrong output type, require UnicodeArt')
return out
if want == 'latex' and OutputLatex in supported:
out = self._backend.latex_formatter(obj, **kwds)
if type(out) is not OutputLatex:
raise OutputTypeException('backend returned wrong output type, require Latex')
return out
if plain_text is not None:
if type(plain_text) is not OutputPlainText:
raise OutputTypeException('backend returned wrong output type, require PlainText')
return plain_text
out = self._backend.plain_text_formatter(obj, **kwds)
if type(out) is not OutputPlainText:
raise OutputTypeException('backend returned wrong output type, require PlainText')
return out
def _call_rich_repr(self, obj, rich_repr_kwds):
"""
Call the ``_rich_repr_`` method
This method calls ``obj._rich_repr_``. If this raises an
exception, it is caught and a suitable warning is displayed.
INPUT:
- ``obj`` -- anything.
- ``rich_repr_kwds`` -- dictionary. Optional keyword arguments
that are passed through to ``obj._rich_repr_``.
OUTPUT:
Whatever ``_rich_repr_`` returned. If it raises an exception,
then a :class:`DisplayFormatterWarning`` is displayed and
``None`` is returned.
EXAMPLES::
sage: class Foo(SageObject):
....: def _rich_repr_(self, display_manager, **kwds):
....: raise ValueError('reason')
sage: from sage.repl.rich_output import get_display_manager
sage: dm = get_display_manager()
sage: dm._call_rich_repr(Foo(), {})
doctest:...: RichReprWarning: Exception in _rich_repr_ while displaying object: reason
"""
if rich_repr_kwds:
# do not ignore errors from invalid options
return obj._rich_repr_(self, **rich_repr_kwds)
try:
return obj._rich_repr_(self)
except NotImplementedError as e:
# don't warn on NotImplementedErrors
return None
except Exception as e:
warnings.warn(
'Exception in _rich_repr_ while displaying object: {0}'.format(e),
RichReprWarning,
)
def _rich_output_formatter(self, obj, rich_repr_kwds):
"""
Generate appropriate rich output containers.
INPUT:
- ``obj`` -- anything.
- ``rich_repr_kwds`` -- dictionary. Optional keyword arguments
that are passed through to ``obj._rich_repr_``.
OUTPUT:
A pair of rich output containers. The first is plain text,
that is, an instance of
:class:`~sage.repl.rich_output.output_basic.OutputPlainText`. The
second is the best rich output available, subject to the
constraints of the backend.
EXAMPLES::
sage: from sage.repl.rich_output import get_display_manager
sage: dm = get_display_manager()
sage: dm._rich_output_formatter(1/2, dict())
(OutputPlainText container, OutputPlainText container)
"""
rich_output = None
plain_text = None
has_rich_repr = isinstance(obj, SageObject) and hasattr(obj, '_rich_repr_')
if has_rich_repr:
rich_output = self._call_rich_repr(obj, rich_repr_kwds)
if isinstance(rich_output, OutputPlainText):
plain_text = rich_output
elif has_rich_repr:
with restricted_output(self, [OutputPlainText]):
plain_text = self._call_rich_repr(obj, rich_repr_kwds)
if plain_text is None:
plain_text = self._backend.plain_text_formatter(obj, **rich_repr_kwds)
if rich_output is None:
rich_output = self._preferred_text_formatter(
obj, plain_text=plain_text, **rich_repr_kwds)
# promote output container types to backend-specific containers
plain_text = self._promote_output(plain_text)
rich_output = self._promote_output(rich_output)
# check that the output container types are valid for the backend
supported = self._backend.supported_output()
if not (type(plain_text) in supported):
raise OutputTypeException(
'text output container not supported: {0}'.format(type(plain_text)))
if not (type(rich_output) in supported):
raise OutputTypeException(
'output container not supported: {0}'.format(type(rich_output)))
return plain_text, rich_output
def graphics_from_save(self, save_function, save_kwds,
file_extension, output_container,
figsize=None, dpi=None):
r"""
Helper to construct graphics.
This method can be used to simplify the implementation of a
``_rich_repr_`` method of a graphics object if there is
already a function to save graphics to a file.
INPUT:
- ``save_function`` -- callable that can save graphics to a file
and accepts options like
:meth:`sage.plot.graphics.Graphics.save`.
- ``save_kwds`` -- dictionary. Keyword arguments that are
passed to the save function.
- ``file_extension`` -- string starting with ``'.'``. The file
extension of the graphics file.
- ``output_container`` -- subclass of
:class:`sage.repl.rich_output.output_basic.OutputBase`. The
output container to use. Must be one of the types in
:meth:`supported_output`.
- ``figsize`` -- pair of integers (optional). The desired graphics
size in pixels. Suggested, but need not be respected by the
output.
- ``dpi`` -- integer (optional). The desired resolution in dots
per inch. Suggested, but need not be respected by the output.
OUTPUT:
Return an instance of ``output_container``.
EXAMPLES::
sage: from sage.repl.rich_output import get_display_manager
sage: dm = get_display_manager()
sage: plt = plot(sin)
sage: out = dm.graphics_from_save(plt.save, dict(), '.png', dm.types.OutputImagePng)
sage: out
OutputImagePng container
sage: out.png.get().startswith('\x89PNG')
True
sage: out.png.filename() # random
'/home/user/.sage/temp/localhost.localdomain/23903/tmp_pu5woK.png'
"""
import os
if not file_extension.startswith(os.path.extsep):
raise ValueError('file_extension must start with a period')
if output_container not in self.supported_output():
raise OutputTypeException('output_container is not supported by backend')
from sage.misc.temporary_file import tmp_filename
filename = tmp_filename(ext=file_extension)
# Call the save_function with the right arguments
kwds = dict(save_kwds)
if figsize is not None:
kwds['figsize'] = figsize
if dpi is not None:
kwds['dpi'] = dpi
save_function(filename, **kwds)
from sage.repl.rich_output.buffer import OutputBuffer
buf = OutputBuffer.from_file(filename)
return output_container(buf)
def threejs_scripts(self, online):
"""
Return Three.js script tags for the current backend.
INPUT:
- ``online`` -- Boolean determining script usage context
OUTPUT:
String containing script tags
.. NOTE::
This base method handles ``online=True`` case only, serving CDN
script tags. Location of scripts for offline usage is
backend-specific.
EXAMPLES::
sage: from sage.repl.rich_output import get_display_manager
sage: get_display_manager().threejs_scripts(online=True)
'...<script src="https://cdn.rawgit.com/mrdoob/three.js/...'
sage: get_display_manager().threejs_scripts(online=False)
Traceback (most recent call last):
...
ValueError: current backend does not support
offline threejs graphics
"""
if online:
from sage.misc.package import installed_packages
version = installed_packages()['threejs']
return """
<script src="https://cdn.rawgit.com/mrdoob/three.js/{0}/build/three.min.js"></script>
<script src="https://cdn.rawgit.com/mrdoob/three.js/{0}/examples/js/controls/OrbitControls.js"></script>
""".format(version)
try:
return self._backend.threejs_offline_scripts()
except AttributeError:
raise ValueError(
'current backend does not support offline threejs graphics')
def supported_output(self):
"""
Return the output container classes that can be used.
OUTPUT:
Frozen set of subclasses of
:class:`~sage.repl.rich_output.output_basic.OutputBase`. If
the backend defines derived container classes, this method
will always return their base classes.
EXAMPLES::
sage: from sage.repl.rich_output import get_display_manager
sage: dm = get_display_manager()
sage: dm.types.OutputPlainText in dm.supported_output()
True
sage: type(dm.supported_output())
<... 'frozenset'>
"""
return self._supported_output
def displayhook(self, obj):
"""
Implementation of the displayhook
Every backend must pass the value of the last statement of a
line / cell to this method. See also
:meth:`display_immediately` if you want do display rich output
while a program is running.
INPUT:
- ``obj`` -- anything. The object to be shown.
OUTPUT:
Returns whatever the backend's displayhook method returned.
EXAMPLES::
sage: from sage.repl.rich_output import get_display_manager
sage: dm = get_display_manager()
sage: dm.displayhook(1/2)
1/2
"""
if obj is None:
return
self._backend.set_underscore_variable(obj)
plain_text, rich_output = self._rich_output_formatter(obj, dict())
return self._backend.displayhook(plain_text, rich_output)
def display_immediately(self, obj, **rich_repr_kwds):
"""
Show output without going back to the command line prompt.
This method must be called to create rich output from an
object when we are not returning to the command line prompt,
for example during program execution. Typically, it is being
called by :meth:`sage.plot.graphics.Graphics.show`.
INPUT:
- ``obj`` -- anything. The object to be shown.
- ``rich_repr_kwds`` -- optional keyword arguments that are
passed through to ``obj._rich_repr_``.
EXAMPLES::
sage: from sage.repl.rich_output import get_display_manager
sage: dm = get_display_manager()
sage: dm.display_immediately(1/2)
1/2
"""
plain_text, rich_output = self._rich_output_formatter(obj, rich_repr_kwds)
self._backend.display_immediately(plain_text, rich_output)
get_display_manager = DisplayManager.get_instance