344 lines
11 KiB
Python
344 lines
11 KiB
Python
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# -*- coding: utf-8 -*-
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"""
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pygments.lexers
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~~~~~~~~~~~~~~~
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Pygments lexers.
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:copyright: Copyright 2006-2019 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.lexers._mapping import LEXERS
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from pygments.modeline import get_filetype_from_buffer
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from pygments.plugin import find_plugin_lexers
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from pygments.util import ClassNotFound, guess_decode
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COMPAT = {
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'Python3Lexer': 'PythonLexer',
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'Python3TracebackLexer': 'PythonTracebackLexer',
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}
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__all__ = ['get_lexer_by_name', 'get_lexer_for_filename', 'find_lexer_class',
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'guess_lexer', 'load_lexer_from_file'] + list(LEXERS) + list(COMPAT)
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_lexer_cache = {}
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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_lexers(module_name):
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"""Load a lexer (and all others in the module too)."""
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mod = __import__(module_name, None, None, ['__all__'])
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for lexer_name in mod.__all__:
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cls = getattr(mod, lexer_name)
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_lexer_cache[cls.name] = cls
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def get_all_lexers():
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"""Return a generator of tuples in the form ``(name, aliases,
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filenames, mimetypes)`` of all know lexers.
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"""
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for item in LEXERS.values():
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yield item[1:]
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for lexer in find_plugin_lexers():
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yield lexer.name, lexer.aliases, lexer.filenames, lexer.mimetypes
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def find_lexer_class(name):
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"""Lookup a lexer class by name.
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Return None if not found.
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"""
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if name in _lexer_cache:
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return _lexer_cache[name]
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# lookup builtin lexers
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for module_name, lname, aliases, _, _ in LEXERS.values():
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if name == lname:
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_load_lexers(module_name)
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return _lexer_cache[name]
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# continue with lexers from setuptools entrypoints
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for cls in find_plugin_lexers():
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if cls.name == name:
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return cls
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def find_lexer_class_by_name(_alias):
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"""Lookup a lexer class by alias.
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Like `get_lexer_by_name`, but does not instantiate the class.
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.. versionadded:: 2.2
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"""
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if not _alias:
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raise ClassNotFound('no lexer for alias %r found' % _alias)
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# lookup builtin lexers
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for module_name, name, aliases, _, _ in LEXERS.values():
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if _alias.lower() in aliases:
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if name not in _lexer_cache:
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_load_lexers(module_name)
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return _lexer_cache[name]
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# continue with lexers from setuptools entrypoints
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for cls in find_plugin_lexers():
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if _alias.lower() in cls.aliases:
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return cls
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raise ClassNotFound('no lexer for alias %r found' % _alias)
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def get_lexer_by_name(_alias, **options):
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"""Get a lexer by an alias.
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Raises ClassNotFound if not found.
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"""
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if not _alias:
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raise ClassNotFound('no lexer for alias %r found' % _alias)
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# lookup builtin lexers
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for module_name, name, aliases, _, _ in LEXERS.values():
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if _alias.lower() in aliases:
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if name not in _lexer_cache:
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_load_lexers(module_name)
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return _lexer_cache[name](**options)
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# continue with lexers from setuptools entrypoints
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for cls in find_plugin_lexers():
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if _alias.lower() in cls.aliases:
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return cls(**options)
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raise ClassNotFound('no lexer for alias %r found' % _alias)
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def load_lexer_from_file(filename, lexername="CustomLexer", **options):
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"""Load a lexer 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 Lexer class. By default, it expects the
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Lexer to be name CustomLexer; you can specify your own class name
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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 Lexer.
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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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with open(filename, 'rb') as f:
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exec(f.read(), custom_namespace)
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# Retrieve the class `lexername` from that namespace
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if lexername not in custom_namespace:
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raise ClassNotFound('no valid %s class found in %s' %
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(lexername, filename))
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lexer_class = custom_namespace[lexername]
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# And finally instantiate it with the options
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return lexer_class(**options)
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except IOError as err:
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raise ClassNotFound('cannot read %s: %s' % (filename, err))
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except ClassNotFound:
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raise
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except Exception as err:
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raise ClassNotFound('error when loading custom lexer: %s' % err)
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def find_lexer_class_for_filename(_fn, code=None):
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"""Get a lexer for a filename.
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If multiple lexers match the filename pattern, use ``analyse_text()`` to
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figure out which one is more appropriate.
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Returns None if not found.
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"""
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matches = []
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fn = basename(_fn)
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for modname, name, _, filenames, _ in LEXERS.values():
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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 _lexer_cache:
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_load_lexers(modname)
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matches.append((_lexer_cache[name], filename))
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for cls in find_plugin_lexers():
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for filename in cls.filenames:
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if _fn_matches(fn, filename):
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matches.append((cls, filename))
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if isinstance(code, bytes):
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# decode it, since all analyse_text functions expect unicode
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code = guess_decode(code)
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def get_rating(info):
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cls, filename = info
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# explicit patterns get a bonus
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bonus = '*' not in filename and 0.5 or 0
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# The class _always_ defines analyse_text because it's included in
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# the Lexer class. The default implementation returns None which
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# gets turned into 0.0. Run scripts/detect_missing_analyse_text.py
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# to find lexers which need it overridden.
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if code:
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return cls.analyse_text(code) + bonus, cls.__name__
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return cls.priority + bonus, cls.__name__
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if matches:
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matches.sort(key=get_rating)
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# print "Possible lexers, after sort:", matches
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return matches[-1][0]
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def get_lexer_for_filename(_fn, code=None, **options):
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"""Get a lexer for a filename.
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If multiple lexers match the filename pattern, use ``analyse_text()`` to
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figure out which one is more appropriate.
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Raises ClassNotFound if not found.
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"""
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res = find_lexer_class_for_filename(_fn, code)
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if not res:
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raise ClassNotFound('no lexer for filename %r found' % _fn)
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return res(**options)
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def get_lexer_for_mimetype(_mime, **options):
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"""Get a lexer for a mimetype.
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Raises ClassNotFound if not found.
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"""
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for modname, name, _, _, mimetypes in LEXERS.values():
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if _mime in mimetypes:
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if name not in _lexer_cache:
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_load_lexers(modname)
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return _lexer_cache[name](**options)
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for cls in find_plugin_lexers():
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if _mime in cls.mimetypes:
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return cls(**options)
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raise ClassNotFound('no lexer for mimetype %r found' % _mime)
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def _iter_lexerclasses(plugins=True):
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"""Return an iterator over all lexer classes."""
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for key in sorted(LEXERS):
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module_name, name = LEXERS[key][:2]
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if name not in _lexer_cache:
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_load_lexers(module_name)
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yield _lexer_cache[name]
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if plugins:
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for lexer in find_plugin_lexers():
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yield lexer
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def guess_lexer_for_filename(_fn, _text, **options):
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"""
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Lookup all lexers that handle those filenames primary (``filenames``)
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or secondary (``alias_filenames``). Then run a text analysis for those
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lexers and choose the best result.
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usage::
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>>> from pygments.lexers import guess_lexer_for_filename
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>>> guess_lexer_for_filename('hello.html', '<%= @foo %>')
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<pygments.lexers.templates.RhtmlLexer object at 0xb7d2f32c>
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>>> guess_lexer_for_filename('hello.html', '<h1>{{ title|e }}</h1>')
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<pygments.lexers.templates.HtmlDjangoLexer object at 0xb7d2f2ac>
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>>> guess_lexer_for_filename('style.css', 'a { color: <?= $link ?> }')
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<pygments.lexers.templates.CssPhpLexer object at 0xb7ba518c>
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"""
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fn = basename(_fn)
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primary = {}
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matching_lexers = set()
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for lexer in _iter_lexerclasses():
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for filename in lexer.filenames:
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if _fn_matches(fn, filename):
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matching_lexers.add(lexer)
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primary[lexer] = True
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for filename in lexer.alias_filenames:
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if _fn_matches(fn, filename):
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matching_lexers.add(lexer)
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primary[lexer] = False
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if not matching_lexers:
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raise ClassNotFound('no lexer for filename %r found' % fn)
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if len(matching_lexers) == 1:
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return matching_lexers.pop()(**options)
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result = []
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for lexer in matching_lexers:
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rv = lexer.analyse_text(_text)
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if rv == 1.0:
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return lexer(**options)
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result.append((rv, lexer))
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def type_sort(t):
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# sort by:
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# - analyse score
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# - is primary filename pattern?
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# - priority
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# - last resort: class name
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return (t[0], primary[t[1]], t[1].priority, t[1].__name__)
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result.sort(key=type_sort)
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return result[-1][1](**options)
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def guess_lexer(_text, **options):
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"""Guess a lexer by strong distinctions in the text (eg, shebang)."""
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if not isinstance(_text, str):
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inencoding = options.get('inencoding', options.get('encoding'))
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if inencoding:
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_text = _text.decode(inencoding or 'utf8')
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else:
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_text, _ = guess_decode(_text)
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# try to get a vim modeline first
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ft = get_filetype_from_buffer(_text)
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if ft is not None:
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try:
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return get_lexer_by_name(ft, **options)
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except ClassNotFound:
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pass
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best_lexer = [0.0, None]
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for lexer in _iter_lexerclasses():
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rv = lexer.analyse_text(_text)
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if rv == 1.0:
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return lexer(**options)
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if rv > best_lexer[0]:
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best_lexer[:] = (rv, lexer)
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if not best_lexer[0] or best_lexer[1] is None:
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raise ClassNotFound('no lexer matching the text found')
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return best_lexer[1](**options)
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class _automodule(types.ModuleType):
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"""Automatically import lexers."""
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def __getattr__(self, name):
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info = LEXERS.get(name)
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if info:
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_load_lexers(info[0])
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cls = _lexer_cache[info[1]]
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setattr(self, name, cls)
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return cls
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if name in COMPAT:
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return getattr(self, COMPAT[name])
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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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