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# -*- coding: utf-8 -*-
"""
pygments.lexers
~~~~~~~~~~~~~~~
Pygments lexers.
:copyright: Copyright 2006-2012 by the Pygments team, see AUTHORS.
:license: BSD, see LICENSE for details.
"""
import sys
import types
import fnmatch
from os.path import basename
from pygments.lexers._mapping import LEXERS
from pygments.plugin import find_plugin_lexers
from pygments.util import ClassNotFound, bytes
__all__ = ['get_lexer_by_name', 'get_lexer_for_filename', 'find_lexer_class',
'guess_lexer'] + LEXERS.keys()
_lexer_cache = {}
def _load_lexers(module_name):
"""
Load a lexer (and all others in the module too).
"""
mod = __import__(module_name, None, None, ['__all__'])
for lexer_name in mod.__all__:
cls = getattr(mod, lexer_name)
_lexer_cache[cls.name] = cls
def get_all_lexers():
"""
Return a generator of tuples in the form ``(name, aliases,
filenames, mimetypes)`` of all know lexers.
"""
for item in LEXERS.itervalues():
yield item[1:]
for lexer in find_plugin_lexers():
yield lexer.name, lexer.aliases, lexer.filenames, lexer.mimetypes
def find_lexer_class(name):
"""
Lookup a lexer class by name. Return None if not found.
"""
if name in _lexer_cache:
return _lexer_cache[name]
# lookup builtin lexers
for module_name, lname, aliases, _, _ in LEXERS.itervalues():
if name == lname:
_load_lexers(module_name)
return _lexer_cache[name]
# continue with lexers from setuptools entrypoints
for cls in find_plugin_lexers():
if cls.name == name:
return cls
def get_lexer_by_name(_alias, **options):
"""
Get a lexer by an alias.
"""
# lookup builtin lexers
for module_name, name, aliases, _, _ in LEXERS.itervalues():
if _alias in aliases:
if name not in _lexer_cache:
_load_lexers(module_name)
return _lexer_cache[name](**options)
# continue with lexers from setuptools entrypoints
for cls in find_plugin_lexers():
if _alias in cls.aliases:
return cls(**options)
raise ClassNotFound('no lexer for alias %r found' % _alias)
def get_lexer_for_filename(_fn, code=None, **options):
"""
Get a lexer for a filename. If multiple lexers match the filename
pattern, use ``analyze_text()`` to figure out which one is more
appropriate.
"""
matches = []
fn = basename(_fn)
for modname, name, _, filenames, _ in LEXERS.itervalues():
for filename in filenames:
if fnmatch.fnmatch(fn, filename):
if name not in _lexer_cache:
_load_lexers(modname)
matches.append((_lexer_cache[name], filename))
for cls in find_plugin_lexers():
for filename in cls.filenames:
if fnmatch.fnmatch(fn, filename):
matches.append((cls, filename))
if sys.version_info > (3,) and isinstance(code, bytes):
# decode it, since all analyse_text functions expect unicode
code = code.decode('latin1')
def get_rating(info):
cls, filename = info
# explicit patterns get a bonus
bonus = '*' not in filename and 0.5 or 0
# The class _always_ defines analyse_text because it's included in
# the Lexer class. The default implementation returns None which
# gets turned into 0.0. Run scripts/detect_missing_analyse_text.py
# to find lexers which need it overridden.
if code:
return cls.analyse_text(code) + bonus
return bonus
if matches:
matches.sort(key=get_rating)
#print "Possible lexers, after sort:", matches
return matches[-1][0](**options)
raise ClassNotFound('no lexer for filename %r found' % _fn)
def get_lexer_for_mimetype(_mime, **options):
"""
Get a lexer for a mimetype.
"""
for modname, name, _, _, mimetypes in LEXERS.itervalues():
if _mime in mimetypes:
if name not in _lexer_cache:
_load_lexers(modname)
return _lexer_cache[name](**options)
for cls in find_plugin_lexers():
if _mime in cls.mimetypes:
return cls(**options)
raise ClassNotFound('no lexer for mimetype %r found' % _mime)
def _iter_lexerclasses():
"""
Return an iterator over all lexer classes.
"""
for key in sorted(LEXERS):
module_name, name = LEXERS[key][:2]
if name not in _lexer_cache:
_load_lexers(module_name)
yield _lexer_cache[name]
for lexer in find_plugin_lexers():
yield lexer
def guess_lexer_for_filename(_fn, _text, **options):
"""
Lookup all lexers that handle those filenames primary (``filenames``)
or secondary (``alias_filenames``). Then run a text analysis for those
lexers and choose the best result.
usage::
>>> from pygments.lexers import guess_lexer_for_filename
>>> guess_lexer_for_filename('hello.html', '<%= @foo %>')
>>> guess_lexer_for_filename('hello.html', '
{{ title|e }}
')
>>> guess_lexer_for_filename('style.css', 'a { color: }')
"""
fn = basename(_fn)
primary = None
matching_lexers = set()
for lexer in _iter_lexerclasses():
for filename in lexer.filenames:
if fnmatch.fnmatch(fn, filename):
matching_lexers.add(lexer)
primary = lexer
for filename in lexer.alias_filenames:
if fnmatch.fnmatch(fn, filename):
matching_lexers.add(lexer)
if not matching_lexers:
raise ClassNotFound('no lexer for filename %r found' % fn)
if len(matching_lexers) == 1:
return matching_lexers.pop()(**options)
result = []
for lexer in matching_lexers:
rv = lexer.analyse_text(_text)
if rv == 1.0:
return lexer(**options)
result.append((rv, lexer))
result.sort()
if not result[-1][0] and primary is not None:
return primary(**options)
return result[-1][1](**options)
def guess_lexer(_text, **options):
"""
Guess a lexer by strong distinctions in the text (eg, shebang).
"""
best_lexer = [0.0, None]
for lexer in _iter_lexerclasses():
rv = lexer.analyse_text(_text)
if rv == 1.0:
return lexer(**options)
if rv > best_lexer[0]:
best_lexer[:] = (rv, lexer)
if not best_lexer[0] or best_lexer[1] is None:
raise ClassNotFound('no lexer matching the text found')
return best_lexer[1](**options)
class _automodule(types.ModuleType):
"""Automatically import lexers."""
def __getattr__(self, name):
info = LEXERS.get(name)
if info:
_load_lexers(info[0])
cls = _lexer_cache[info[1]]
setattr(self, name, cls)
return cls
raise AttributeError(name)
oldmod = sys.modules['pygments.lexers']
newmod = _automodule('pygments.lexers')
newmod.__dict__.update(oldmod.__dict__)
sys.modules['pygments.lexers'] = newmod
del newmod.newmod, newmod.oldmod, newmod.sys, newmod.types
