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"""Top-level display functions for displaying object in different formats."""
# Copyright (c) IPython Development Team.
# Distributed under the terms of the Modified BSD License.
from binascii import b2a_base64, hexlify
import html
import json
import mimetypes
import os
import struct
import warnings
from copy import deepcopy
from os.path import splitext
from pathlib import Path, PurePath
from typing import Optional
from IPython.testing.skipdoctest import skip_doctest
from . import display_functions
__all__ = [
"display_pretty",
"display_html",
"display_markdown",
"display_svg",
"display_png",
"display_jpeg",
"display_webp",
"display_latex",
"display_json",
"display_javascript",
"display_pdf",
"DisplayObject",
"TextDisplayObject",
"Pretty",
"HTML",
"Markdown",
"Math",
"Latex",
"SVG",
"ProgressBar",
"JSON",
"GeoJSON",
"Javascript",
"Image",
"Video",
]
#-----------------------------------------------------------------------------
# utility functions
#-----------------------------------------------------------------------------
def _safe_exists(path):
"""Check path, but don't let exceptions raise"""
try:
return os.path.exists(path)
except Exception:
return False
def _display_mimetype(mimetype, objs, raw=False, metadata=None):
"""internal implementation of all display_foo methods
Parameters
----------
mimetype : str
The mimetype to be published (e.g. 'image/png')
*objs : object
The Python objects to display, or if raw=True raw text data to
display.
raw : bool
Are the data objects raw data or Python objects that need to be
formatted before display? [default: False]
metadata : dict (optional)
Metadata to be associated with the specific mimetype output.
"""
if metadata:
metadata = {mimetype: metadata}
if raw:
# turn list of pngdata into list of { 'image/png': pngdata }
objs = [ {mimetype: obj} for obj in objs ]
display_functions.display(*objs, raw=raw, metadata=metadata, include=[mimetype])
#-----------------------------------------------------------------------------
# Main functions
#-----------------------------------------------------------------------------
def display_pretty(*objs, **kwargs):
"""Display the pretty (default) representation of an object.
Parameters
----------
*objs : object
The Python objects to display, or if raw=True raw text data to
display.
raw : bool
Are the data objects raw data or Python objects that need to be
formatted before display? [default: False]
metadata : dict (optional)
Metadata to be associated with the specific mimetype output.
"""
_display_mimetype('text/plain', objs, **kwargs)
def display_html(*objs, **kwargs):
"""Display the HTML representation of an object.
Note: If raw=False and the object does not have a HTML
representation, no HTML will be shown.
Parameters
----------
*objs : object
The Python objects to display, or if raw=True raw HTML data to
display.
raw : bool
Are the data objects raw data or Python objects that need to be
formatted before display? [default: False]
metadata : dict (optional)
Metadata to be associated with the specific mimetype output.
"""
_display_mimetype('text/html', objs, **kwargs)
def display_markdown(*objs, **kwargs):
"""Displays the Markdown representation of an object.
Parameters
----------
*objs : object
The Python objects to display, or if raw=True raw markdown data to
display.
raw : bool
Are the data objects raw data or Python objects that need to be
formatted before display? [default: False]
metadata : dict (optional)
Metadata to be associated with the specific mimetype output.
"""
_display_mimetype('text/markdown', objs, **kwargs)
def display_svg(*objs, **kwargs):
"""Display the SVG representation of an object.
Parameters
----------
*objs : object
The Python objects to display, or if raw=True raw svg data to
display.
raw : bool
Are the data objects raw data or Python objects that need to be
formatted before display? [default: False]
metadata : dict (optional)
Metadata to be associated with the specific mimetype output.
"""
_display_mimetype('image/svg+xml', objs, **kwargs)
def display_png(*objs, **kwargs):
"""Display the PNG representation of an object.
Parameters
----------
*objs : object
The Python objects to display, or if raw=True raw png data to
display.
raw : bool
Are the data objects raw data or Python objects that need to be
formatted before display? [default: False]
metadata : dict (optional)
Metadata to be associated with the specific mimetype output.
"""
_display_mimetype('image/png', objs, **kwargs)
def display_jpeg(*objs, **kwargs):
"""Display the JPEG representation of an object.
Parameters
----------
*objs : object
The Python objects to display, or if raw=True raw JPEG data to
display.
raw : bool
Are the data objects raw data or Python objects that need to be
formatted before display? [default: False]
metadata : dict (optional)
Metadata to be associated with the specific mimetype output.
"""
_display_mimetype('image/jpeg', objs, **kwargs)
def display_webp(*objs, **kwargs):
"""Display the WEBP representation of an object.
Parameters
----------
*objs : object
The Python objects to display, or if raw=True raw JPEG data to
display.
raw : bool
Are the data objects raw data or Python objects that need to be
formatted before display? [default: False]
metadata : dict (optional)
Metadata to be associated with the specific mimetype output.
"""
_display_mimetype("image/webp", objs, **kwargs)
def display_latex(*objs, **kwargs):
"""Display the LaTeX representation of an object.
Parameters
----------
*objs : object
The Python objects to display, or if raw=True raw latex data to
display.
raw : bool
Are the data objects raw data or Python objects that need to be
formatted before display? [default: False]
metadata : dict (optional)
Metadata to be associated with the specific mimetype output.
"""
_display_mimetype('text/latex', objs, **kwargs)
def display_json(*objs, **kwargs):
"""Display the JSON representation of an object.
Note that not many frontends support displaying JSON.
Parameters
----------
*objs : object
The Python objects to display, or if raw=True raw json data to
display.
raw : bool
Are the data objects raw data or Python objects that need to be
formatted before display? [default: False]
metadata : dict (optional)
Metadata to be associated with the specific mimetype output.
"""
_display_mimetype('application/json', objs, **kwargs)
def display_javascript(*objs, **kwargs):
"""Display the Javascript representation of an object.
Parameters
----------
*objs : object
The Python objects to display, or if raw=True raw javascript data to
display.
raw : bool
Are the data objects raw data or Python objects that need to be
formatted before display? [default: False]
metadata : dict (optional)
Metadata to be associated with the specific mimetype output.
"""
_display_mimetype('application/javascript', objs, **kwargs)
def display_pdf(*objs, **kwargs):
"""Display the PDF representation of an object.
Parameters
----------
*objs : object
The Python objects to display, or if raw=True raw javascript data to
display.
raw : bool
Are the data objects raw data or Python objects that need to be
formatted before display? [default: False]
metadata : dict (optional)
Metadata to be associated with the specific mimetype output.
"""
_display_mimetype('application/pdf', objs, **kwargs)
#-----------------------------------------------------------------------------
# Smart classes
#-----------------------------------------------------------------------------
class DisplayObject:
"""An object that wraps data to be displayed."""
_read_flags = 'r'
_show_mem_addr = False
metadata = None
def __init__(self, data=None, url=None, filename=None, metadata=None):
"""Create a display object given raw data.
When this object is returned by an expression or passed to the
display function, it will result in the data being displayed
in the frontend. The MIME type of the data should match the
subclasses used, so the Png subclass should be used for 'image/png'
data. If the data is a URL, the data will first be downloaded
and then displayed.
Parameters
----------
data : unicode, str or bytes
The raw data or a URL or file to load the data from
url : unicode
A URL to download the data from.
filename : unicode
Path to a local file to load the data from.
metadata : dict
Dict of metadata associated to be the object when displayed
"""
if isinstance(data, (Path, PurePath)):
data = str(data)
if data is not None and isinstance(data, str):
if data.startswith('http') and url is None:
url = data
filename = None
data = None
elif _safe_exists(data) and filename is None:
url = None
filename = data
data = None
self.url = url
self.filename = filename
# because of @data.setter methods in
# subclasses ensure url and filename are set
# before assigning to self.data
self.data = data
if metadata is not None:
self.metadata = metadata
elif self.metadata is None:
self.metadata = {}
self.reload()
self._check_data()
def __repr__(self):
if not self._show_mem_addr:
cls = self.__class__
r = "<%s.%s object>" % (cls.__module__, cls.__name__)
else:
r = super(DisplayObject, self).__repr__()
return r
def _check_data(self):
"""Override in subclasses if there's something to check."""
pass
def _data_and_metadata(self):
"""shortcut for returning metadata with shape information, if defined"""
if self.metadata:
return self.data, deepcopy(self.metadata)
else:
return self.data
def reload(self):
"""Reload the raw data from file or URL."""
if self.filename is not None:
encoding = None if "b" in self._read_flags else "utf-8"
with open(self.filename, self._read_flags, encoding=encoding) as f:
self.data = f.read()
elif self.url is not None:
# Deferred import
from urllib.request import urlopen
response = urlopen(self.url)
data = response.read()
# extract encoding from header, if there is one:
encoding = None
if 'content-type' in response.headers:
for sub in response.headers['content-type'].split(';'):
sub = sub.strip()
if sub.startswith('charset'):
encoding = sub.split('=')[-1].strip()
break
if 'content-encoding' in response.headers:
# TODO: do deflate?
if 'gzip' in response.headers['content-encoding']:
import gzip
from io import BytesIO
# assume utf-8 if encoding is not specified
with gzip.open(
BytesIO(data), "rt", encoding=encoding or "utf-8"
) as fp:
encoding = None
data = fp.read()
# decode data, if an encoding was specified
# We only touch self.data once since
# subclasses such as SVG have @data.setter methods
# that transform self.data into ... well svg.
if encoding:
self.data = data.decode(encoding, 'replace')
else:
self.data = data
class TextDisplayObject(DisplayObject):
"""Create a text display object given raw data.
Parameters
----------
data : str or unicode
The raw data or a URL or file to load the data from.
url : unicode
A URL to download the data from.
filename : unicode
Path to a local file to load the data from.
metadata : dict
Dict of metadata associated to be the object when displayed
"""
def _check_data(self):
if self.data is not None and not isinstance(self.data, str):
raise TypeError("%s expects text, not %r" % (self.__class__.__name__, self.data))
class Pretty(TextDisplayObject):
def _repr_pretty_(self, pp, cycle):
return pp.text(self.data)
class HTML(TextDisplayObject):
def __init__(self, data=None, url=None, filename=None, metadata=None):
def warn():
if not data:
return False
#
# Avoid calling lower() on the entire data, because it could be a
# long string and we're only interested in its beginning and end.
#
prefix = data[:10].lower()
suffix = data[-10:].lower()
return prefix.startswith("<iframe ") and suffix.endswith("</iframe>")
if warn():
warnings.warn("Consider using IPython.display.IFrame instead")
super(HTML, self).__init__(data=data, url=url, filename=filename, metadata=metadata)
def _repr_html_(self):
return self._data_and_metadata()
def __html__(self):
"""
This method exists to inform other HTML-using modules (e.g. Markupsafe,
htmltag, etc) that this object is HTML and does not need things like
special characters (<>&) escaped.
"""
return self._repr_html_()
class Markdown(TextDisplayObject):
def _repr_markdown_(self):
return self._data_and_metadata()
class Math(TextDisplayObject):
def _repr_latex_(self):
s = r"$\displaystyle %s$" % self.data.strip('$')
if self.metadata:
return s, deepcopy(self.metadata)
else:
return s
class Latex(TextDisplayObject):
def _repr_latex_(self):
return self._data_and_metadata()
class SVG(DisplayObject):
"""Embed an SVG into the display.
Note if you just want to view a svg image via a URL use `:class:Image` with
a url=URL keyword argument.
"""
_read_flags = 'rb'
# wrap data in a property, which extracts the <svg> tag, discarding
# document headers
_data: Optional[str] = None
@property
def data(self):
return self._data
@data.setter
def data(self, svg):
if svg is None:
self._data = None
return
# parse into dom object
from xml.dom import minidom
x = minidom.parseString(svg)
# get svg tag (should be 1)
found_svg = x.getElementsByTagName('svg')
if found_svg:
svg = found_svg[0].toxml()
else:
# fallback on the input, trust the user
# but this is probably an error.
pass
if isinstance(svg, bytes):
self._data = svg.decode(errors="replace")
else:
self._data = svg
def _repr_svg_(self):
return self._data_and_metadata()
class ProgressBar(DisplayObject):
"""Progressbar supports displaying a progressbar like element
"""
def __init__(self, total):
"""Creates a new progressbar
Parameters
----------
total : int
maximum size of the progressbar
"""
self.total = total
self._progress = 0
self.html_width = '60ex'
self.text_width = 60
self._display_id = hexlify(os.urandom(8)).decode('ascii')
def __repr__(self):
fraction = self.progress / self.total
filled = '=' * int(fraction * self.text_width)
rest = ' ' * (self.text_width - len(filled))
return '[{}{}] {}/{}'.format(
filled, rest,
self.progress, self.total,
)
def _repr_html_(self):
return "<progress style='width:{}' max='{}' value='{}'></progress>".format(
self.html_width, self.total, self.progress)
def display(self):
display_functions.display(self, display_id=self._display_id)
def update(self):
display_functions.display(self, display_id=self._display_id, update=True)
@property
def progress(self):
return self._progress
@progress.setter
def progress(self, value):
self._progress = value
self.update()
def __iter__(self):
self.display()
self._progress = -1 # First iteration is 0
return self
def __next__(self):
"""Returns current value and increments display by one."""
self.progress += 1
if self.progress < self.total:
return self.progress
else:
raise StopIteration()
class JSON(DisplayObject):
"""JSON expects a JSON-able dict or list
not an already-serialized JSON string.
Scalar types (None, number, string) are not allowed, only dict or list containers.
"""
# wrap data in a property, which warns about passing already-serialized JSON
_data = None
def __init__(self, data=None, url=None, filename=None, expanded=False, metadata=None, root='root', **kwargs):
"""Create a JSON display object given raw data.
Parameters
----------
data : dict or list
JSON data to display. Not an already-serialized JSON string.
Scalar types (None, number, string) are not allowed, only dict
or list containers.
url : unicode
A URL to download the data from.
filename : unicode
Path to a local file to load the data from.
expanded : boolean
Metadata to control whether a JSON display component is expanded.
metadata : dict
Specify extra metadata to attach to the json display object.
root : str
The name of the root element of the JSON tree
"""
self.metadata = {
'expanded': expanded,
'root': root,
}
if metadata:
self.metadata.update(metadata)
if kwargs:
self.metadata.update(kwargs)
super(JSON, self).__init__(data=data, url=url, filename=filename)
def _check_data(self):
if self.data is not None and not isinstance(self.data, (dict, list)):
raise TypeError("%s expects JSONable dict or list, not %r" % (self.__class__.__name__, self.data))
@property
def data(self):
return self._data
@data.setter
def data(self, data):
if isinstance(data, (Path, PurePath)):
data = str(data)
if isinstance(data, str):
if self.filename is None and self.url is None:
warnings.warn("JSON expects JSONable dict or list, not JSON strings")
data = json.loads(data)
self._data = data
def _data_and_metadata(self):
return self.data, self.metadata
def _repr_json_(self):
return self._data_and_metadata()
_css_t = """var link = document.createElement("link");
link.rel = "stylesheet";
link.type = "text/css";
link.href = "%s";
document.head.appendChild(link);
"""
_lib_t1 = """new Promise(function(resolve, reject) {
var script = document.createElement("script");
script.onload = resolve;
script.onerror = reject;
script.src = "%s";
document.head.appendChild(script);
}).then(() => {
"""
_lib_t2 = """
});"""
class GeoJSON(JSON):
"""GeoJSON expects JSON-able dict
not an already-serialized JSON string.
Scalar types (None, number, string) are not allowed, only dict containers.
"""
def __init__(self, *args, **kwargs):
"""Create a GeoJSON display object given raw data.
Parameters
----------
data : dict or list
VegaLite data. Not an already-serialized JSON string.
Scalar types (None, number, string) are not allowed, only dict
or list containers.
url_template : string
Leaflet TileLayer URL template: http://leafletjs.com/reference.html#url-template
layer_options : dict
Leaflet TileLayer options: http://leafletjs.com/reference.html#tilelayer-options
url : unicode
A URL to download the data from.
filename : unicode
Path to a local file to load the data from.
metadata : dict
Specify extra metadata to attach to the json display object.
Examples
--------
The following will display an interactive map of Mars with a point of
interest on frontend that do support GeoJSON display.
>>> from IPython.display import GeoJSON
>>> GeoJSON(data={
... "type": "Feature",
... "geometry": {
... "type": "Point",
... "coordinates": [-81.327, 296.038]
... }
... },
... url_template="http://s3-eu-west-1.amazonaws.com/whereonmars.cartodb.net/{basemap_id}/{z}/{x}/{y}.png",
... layer_options={
... "basemap_id": "celestia_mars-shaded-16k_global",
... "attribution" : "Celestia/praesepe",
... "minZoom" : 0,
... "maxZoom" : 18,
... })
<IPython.core.display.GeoJSON object>
In the terminal IPython, you will only see the text representation of
the GeoJSON object.
"""
super(GeoJSON, self).__init__(*args, **kwargs)
def _ipython_display_(self):
bundle = {
'application/geo+json': self.data,
'text/plain': '<IPython.display.GeoJSON object>'
}
metadata = {
'application/geo+json': self.metadata
}
display_functions.display(bundle, metadata=metadata, raw=True)
class Javascript(TextDisplayObject):
def __init__(self, data=None, url=None, filename=None, lib=None, css=None):
"""Create a Javascript display object given raw data.
When this object is returned by an expression or passed to the
display function, it will result in the data being displayed
in the frontend. If the data is a URL, the data will first be
downloaded and then displayed.
In the Notebook, the containing element will be available as `element`,
and jQuery will be available. Content appended to `element` will be
visible in the output area.
Parameters
----------
data : unicode, str or bytes
The Javascript source code or a URL to download it from.
url : unicode
A URL to download the data from.
filename : unicode
Path to a local file to load the data from.
lib : list or str
A sequence of Javascript library URLs to load asynchronously before
running the source code. The full URLs of the libraries should
be given. A single Javascript library URL can also be given as a
string.
css : list or str
A sequence of css files to load before running the source code.
The full URLs of the css files should be given. A single css URL
can also be given as a string.
"""
if isinstance(lib, str):
lib = [lib]
elif lib is None:
lib = []
if isinstance(css, str):
css = [css]
elif css is None:
css = []
if not isinstance(lib, (list,tuple)):
raise TypeError('expected sequence, got: %r' % lib)
if not isinstance(css, (list,tuple)):
raise TypeError('expected sequence, got: %r' % css)
self.lib = lib
self.css = css
super(Javascript, self).__init__(data=data, url=url, filename=filename)
def _repr_javascript_(self):
r = ''
for c in self.css:
r += _css_t % c
for l in self.lib:
r += _lib_t1 % l
r += self.data
r += _lib_t2*len(self.lib)
return r
# constants for identifying png/jpeg/gif/webp data
_PNG = b"\x89PNG\r\n\x1a\n"
_JPEG = b"\xff\xd8"
_GIF1 = b"GIF87a"
_GIF2 = b"GIF89a"
_WEBP = b"WEBP"
def _pngxy(data):
"""read the (width, height) from a PNG header"""
ihdr = data.index(b'IHDR')
# next 8 bytes are width/height
return struct.unpack('>ii', data[ihdr+4:ihdr+12])
def _jpegxy(data):
"""read the (width, height) from a JPEG header"""
# adapted from http://www.64lines.com/jpeg-width-height
idx = 4
while True:
block_size = struct.unpack('>H', data[idx:idx+2])[0]
idx = idx + block_size
if data[idx:idx+2] == b'\xFF\xC0':
# found Start of Frame
iSOF = idx
break
else:
# read another block
idx += 2
h, w = struct.unpack('>HH', data[iSOF+5:iSOF+9])
return w, h
def _gifxy(data):
"""read the (width, height) from a GIF header"""
return struct.unpack('<HH', data[6:10])
def _webpxy(data):
"""read the (width, height) from a WEBP header"""
if data[12:16] == b"VP8 ":
width, height = struct.unpack("<HH", data[24:30])
width = width & 0x3FFF
height = height & 0x3FFF
return (width, height)
elif data[12:16] == b"VP8L":
size_info = struct.unpack("<I", data[21:25])[0]
width = 1 + ((size_info & 0x3F) << 8) | (size_info >> 24)
height = 1 + (
(((size_info >> 8) & 0xF) << 10)
| (((size_info >> 14) & 0x3FC) << 2)
| ((size_info >> 22) & 0x3)
)
return (width, height)
else:
raise ValueError("Not a valid WEBP header")
class Image(DisplayObject):
_read_flags = "rb"
_FMT_JPEG = "jpeg"
_FMT_PNG = "png"
_FMT_GIF = "gif"
_FMT_WEBP = "webp"
_ACCEPTABLE_EMBEDDINGS = [_FMT_JPEG, _FMT_PNG, _FMT_GIF, _FMT_WEBP]
_MIMETYPES = {
_FMT_PNG: "image/png",
_FMT_JPEG: "image/jpeg",
_FMT_GIF: "image/gif",
_FMT_WEBP: "image/webp",
}
def __init__(
self,
data=None,
url=None,
filename=None,
format=None,
embed=None,
width=None,
height=None,
retina=False,
unconfined=False,
metadata=None,
alt=None,
):
"""Create a PNG/JPEG/GIF/WEBP image object given raw data.
When this object is returned by an input cell or passed to the
display function, it will result in the image being displayed
in the frontend.
Parameters
----------
data : unicode, str or bytes
The raw image data or a URL or filename to load the data from.
This always results in embedded image data.
url : unicode
A URL to download the data from. If you specify `url=`,
the image data will not be embedded unless you also specify `embed=True`.
filename : unicode
Path to a local file to load the data from.
Images from a file are always embedded.
format : unicode
The format of the image data (png/jpeg/jpg/gif/webp). If a filename or URL is given
for format will be inferred from the filename extension.
embed : bool
Should the image data be embedded using a data URI (True) or be
loaded using an <img> tag. Set this to True if you want the image
to be viewable later with no internet connection in the notebook.
Default is `True`, unless the keyword argument `url` is set, then
default value is `False`.
Note that QtConsole is not able to display images if `embed` is set to `False`
width : int
Width in pixels to which to constrain the image in html
height : int
Height in pixels to which to constrain the image in html
retina : bool
Automatically set the width and height to half of the measured
width and height.
This only works for embedded images because it reads the width/height
from image data.
For non-embedded images, you can just set the desired display width
and height directly.
unconfined : bool
Set unconfined=True to disable max-width confinement of the image.
metadata : dict
Specify extra metadata to attach to the image.
alt : unicode
Alternative text for the image, for use by screen readers.
Examples
--------
embedded image data, works in qtconsole and notebook
when passed positionally, the first arg can be any of raw image data,
a URL, or a filename from which to load image data.
The result is always embedding image data for inline images.
>>> Image('https://www.google.fr/images/srpr/logo3w.png') # doctest: +SKIP
<IPython.core.display.Image object>
>>> Image('/path/to/image.jpg')
<IPython.core.display.Image object>
>>> Image(b'RAW_PNG_DATA...')
<IPython.core.display.Image object>
Specifying Image(url=...) does not embed the image data,
it only generates ``<img>`` tag with a link to the source.
This will not work in the qtconsole or offline.
>>> Image(url='https://www.google.fr/images/srpr/logo3w.png')
<IPython.core.display.Image object>
"""
if isinstance(data, (Path, PurePath)):
data = str(data)
if filename is not None:
ext = self._find_ext(filename)
elif url is not None:
ext = self._find_ext(url)
elif data is None:
raise ValueError("No image data found. Expecting filename, url, or data.")
elif isinstance(data, str) and (
data.startswith('http') or _safe_exists(data)
):
ext = self._find_ext(data)
else:
ext = None
if format is None:
if ext is not None:
if ext == u'jpg' or ext == u'jpeg':
format = self._FMT_JPEG
elif ext == u'png':
format = self._FMT_PNG
elif ext == u'gif':
format = self._FMT_GIF
elif ext == "webp":
format = self._FMT_WEBP
else:
format = ext.lower()
elif isinstance(data, bytes):
# infer image type from image data header,
# only if format has not been specified.
if data[:2] == _JPEG:
format = self._FMT_JPEG
elif data[:8] == _PNG:
format = self._FMT_PNG
elif data[8:12] == _WEBP:
format = self._FMT_WEBP