154 lines
5.0 KiB
Python
154 lines
5.0 KiB
Python
# -*- coding: utf-8 -*-
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"""
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pygments.formatters
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~~~~~~~~~~~~~~~~~~~
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Pygments formatters.
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:copyright: Copyright 2006-2017 by the Pygments team, see AUTHORS.
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:license: BSD, see LICENSE for details.
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"""
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import re
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import sys
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import types
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import fnmatch
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from os.path import basename
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from pygments.formatters._mapping import FORMATTERS
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from pygments.plugin import find_plugin_formatters
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from pygments.util import ClassNotFound, itervalues
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__all__ = ['get_formatter_by_name', 'get_formatter_for_filename',
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'get_all_formatters', 'load_formatter_from_file'] + list(FORMATTERS)
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_formatter_cache = {} # classes by name
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_pattern_cache = {}
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def _fn_matches(fn, glob):
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"""Return whether the supplied file name fn matches pattern filename."""
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if glob not in _pattern_cache:
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pattern = _pattern_cache[glob] = re.compile(fnmatch.translate(glob))
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return pattern.match(fn)
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return _pattern_cache[glob].match(fn)
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def _load_formatters(module_name):
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"""Load a formatter (and all others in the module too)."""
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mod = __import__(module_name, None, None, ['__all__'])
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for formatter_name in mod.__all__:
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cls = getattr(mod, formatter_name)
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_formatter_cache[cls.name] = cls
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def get_all_formatters():
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"""Return a generator for all formatter classes."""
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# NB: this returns formatter classes, not info like get_all_lexers().
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for info in itervalues(FORMATTERS):
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if info[1] not in _formatter_cache:
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_load_formatters(info[0])
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yield _formatter_cache[info[1]]
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for _, formatter in find_plugin_formatters():
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yield formatter
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def find_formatter_class(alias):
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"""Lookup a formatter by alias.
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Returns None if not found.
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"""
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for module_name, name, aliases, _, _ in itervalues(FORMATTERS):
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if alias in aliases:
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if name not in _formatter_cache:
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_load_formatters(module_name)
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return _formatter_cache[name]
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for _, cls in find_plugin_formatters():
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if alias in cls.aliases:
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return cls
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def get_formatter_by_name(_alias, **options):
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"""Lookup and instantiate a formatter by alias.
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Raises ClassNotFound if not found.
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"""
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cls = find_formatter_class(_alias)
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if cls is None:
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raise ClassNotFound("no formatter found for name %r" % _alias)
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return cls(**options)
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def load_formatter_from_file(filename, formattername="CustomFormatter",
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**options):
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"""Load a formatter from a file.
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This method expects a file located relative to the current working
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directory, which contains a class named CustomFormatter. By default,
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it expects the Formatter to be named CustomFormatter; you can specify
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your own class name as the second argument to this function.
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Users should be very careful with the input, because this method
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is equivalent to running eval on the input file.
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Raises ClassNotFound if there are any problems importing the Formatter.
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.. versionadded:: 2.2
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"""
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try:
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# This empty dict will contain the namespace for the exec'd file
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custom_namespace = {}
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exec(open(filename, 'rb').read(), custom_namespace)
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# Retrieve the class `formattername` from that namespace
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if formattername not in custom_namespace:
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raise ClassNotFound('no valid %s class found in %s' %
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(formattername, filename))
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formatter_class = custom_namespace[formattername]
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# And finally instantiate it with the options
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return formatter_class(**options)
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except IOError as err:
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raise ClassNotFound('cannot read %s' % filename)
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except ClassNotFound as err:
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raise
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except Exception as err:
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raise ClassNotFound('error when loading custom formatter: %s' % err)
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def get_formatter_for_filename(fn, **options):
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"""Lookup and instantiate a formatter by filename pattern.
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Raises ClassNotFound if not found.
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"""
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fn = basename(fn)
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for modname, name, _, filenames, _ in itervalues(FORMATTERS):
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for filename in filenames:
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if _fn_matches(fn, filename):
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if name not in _formatter_cache:
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_load_formatters(modname)
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return _formatter_cache[name](**options)
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for cls in find_plugin_formatters():
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for filename in cls.filenames:
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if _fn_matches(fn, filename):
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return cls(**options)
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raise ClassNotFound("no formatter found for file name %r" % fn)
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class _automodule(types.ModuleType):
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"""Automatically import formatters."""
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def __getattr__(self, name):
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info = FORMATTERS.get(name)
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if info:
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_load_formatters(info[0])
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cls = _formatter_cache[info[1]]
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setattr(self, name, cls)
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return cls
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raise AttributeError(name)
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oldmod = sys.modules[__name__]
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newmod = _automodule(__name__)
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newmod.__dict__.update(oldmod.__dict__)
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sys.modules[__name__] = newmod
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del newmod.newmod, newmod.oldmod, newmod.sys, newmod.types
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