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# Copyright (c) 2012 - 2020, Anaconda, Inc., and Bokeh Contributors.
# All rights reserved.
#
# The full license is in the file LICENSE.txt, distributed with this software.
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''' Utility functions for helping with operations involving browsers.
'''
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# Boilerplate
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import logging # isort:skip
log = logging.getLogger(__name__)
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# Imports
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# Standard library imports
import webbrowser
from os.path import abspath
from typing import Optional, cast
# External imports
from typing_extensions import Literal, Protocol
# Bokeh imports
from ..settings import settings
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# Globals and constants
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NEW_PARAM = {'tab': 2, 'window': 1}
__all__ = (
'DummyWebBrowser',
'get_browser_controller',
'view',
)
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# General API
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class BrowserLike(Protocol):
''' Interface for browser-like objects.
'''
def open(self, url: str, new: int = 0, autoraise: bool = True) -> bool:
...
[docs]class DummyWebBrowser(object):
''' A "no-op" web-browser controller.
'''
[docs] def open(self, url: str, new: int = 0, autoraise: bool = True) -> bool:
''' Receive standard arguments and take no action. '''
return True
[docs]def get_browser_controller(browser: Optional[str] = None) -> BrowserLike:
''' Return a browser controller.
Args:
browser (str or None) : browser name, or ``None`` (default: ``None``)
If passed the string ``'none'``, a dummy web browser controller
is returned
Otherwise, use the value to select an appropriate controller using
the ``webbrowser`` standard library module. In the value is
``None`` then a system default is used.
Returns:
controller : a web browser controller
'''
browser = settings.browser(browser)
if browser is None:
controller = cast(BrowserLike, webbrowser)
elif browser == "none":
controller = DummyWebBrowser()
else:
controller = webbrowser.get(browser)
return controller
[docs]def view(location: str, browser: Optional[str] = None, new: Literal["same", "window", "tab"] = "same", autoraise: bool = True) -> None:
''' Open a browser to view the specified location.
Args:
location (str) : Location to open
If location does not begin with "http:" it is assumed
to be a file path on the local filesystem.
browser (str or None) : what browser to use (default: None)
If ``None``, use the system default browser.
new (str) : How to open the location. Valid values are:
``'same'`` - open in the current tab
``'tab'`` - open a new tab in the current window
``'window'`` - open in a new window
autoraise (bool) : Whether to automatically raise the location
in a new browser window (default: True)
Returns:
None
'''
try:
new_id = {"same": 0, "window": 1, "tab": 2}[new]
except KeyError:
raise RuntimeError("invalid 'new' value passed to view: %r, valid values are: 'same', 'window', or 'tab'" % new)
if location.startswith("http"):
url = location
else:
url = "file://" + abspath(location)
try:
controller = get_browser_controller(browser)
controller.open(url, new=new_id, autoraise=autoraise)
except Exception:
pass
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# Dev API
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# Private API
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# Code
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