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"""
pygments.plugin
~~~~~~~~~~~~~~~
Pygments plugin interface. By default, this tries to use
``importlib.metadata``, which is in the Python standard
library since Python 3.8, or its ``importlib_metadata``
backport for earlier versions of Python. It falls back on
``pkg_resources`` if not found. Finally, if ``pkg_resources``
is not found either, no plugins are loaded at all.
lexer plugins::
[pygments.lexers]
yourlexer = yourmodule:YourLexer
formatter plugins::
[pygments.formatters]
yourformatter = yourformatter:YourFormatter
/.ext = yourformatter:YourFormatter
As you can see, you can define extensions for the formatter
with a leading slash.
syntax plugins::
[pygments.styles]
yourstyle = yourstyle:YourStyle
filter plugin::
[pygments.filter]
yourfilter = yourfilter:YourFilter
:copyright: Copyright 2006-2023 by the Pygments team, see AUTHORS.
:license: BSD, see LICENSE for details.
"""
LEXER_ENTRY_POINT = 'pygments.lexers'
FORMATTER_ENTRY_POINT = 'pygments.formatters'
STYLE_ENTRY_POINT = 'pygments.styles'
FILTER_ENTRY_POINT = 'pygments.filters'
def iter_entry_points(group_name):
try:
from importlib.metadata import entry_points
except ImportError:
try:
from importlib_metadata import entry_points
except ImportError:
try:
from pip._vendor.pkg_resources import iter_entry_points
except (ImportError, OSError):
return []
else:
return iter_entry_points(group_name)
groups = entry_points()
if hasattr(groups, 'select'):
# New interface in Python 3.10 and newer versions of the
# importlib_metadata backport.
return groups.select(group=group_name)
else:
# Older interface, deprecated in Python 3.10 and recent
# importlib_metadata, but we need it in Python 3.8 and 3.9.
return groups.get(group_name, [])
def find_plugin_lexers():
for entrypoint in iter_entry_points(LEXER_ENTRY_POINT):
yield entrypoint.load()
def find_plugin_formatters():
for entrypoint in iter_entry_points(FORMATTER_ENTRY_POINT):
yield entrypoint.name, entrypoint.load()
def find_plugin_styles():
for entrypoint in iter_entry_points(STYLE_ENTRY_POINT):
yield entrypoint.name, entrypoint.load()
def find_plugin_filters():
for entrypoint in iter_entry_points(FILTER_ENTRY_POINT):
yield entrypoint.name, entrypoint.load()