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# -*- coding: utf-8 -*-
"""
pygments.util
~~~~~~~~~~~~~
Utility functions.
:copyright: Copyright 2006-2012 by the Pygments team, see AUTHORS.
:license: BSD, see LICENSE for details.
"""
import re
import sys
import codecs
split_path_re = re.compile(r'[/\\ ]')
doctype_lookup_re = re.compile(r'''(?smx)
(<\?.*?\?>)?\s*
]*>
''')
tag_re = re.compile(r'<(.+?)(\s.*?)?>.*?(?uism)')
class ClassNotFound(ValueError):
"""
If one of the get_*_by_* functions didn't find a matching class.
"""
class OptionError(Exception):
pass
def get_choice_opt(options, optname, allowed, default=None, normcase=False):
string = options.get(optname, default)
if normcase:
string = string.lower()
if string not in allowed:
raise OptionError('Value for option %s must be one of %s' %
(optname, ', '.join(map(str, allowed))))
return string
def get_bool_opt(options, optname, default=None):
string = options.get(optname, default)
if isinstance(string, bool):
return string
elif isinstance(string, int):
return bool(string)
elif not isinstance(string, basestring):
raise OptionError('Invalid type %r for option %s; use '
'1/0, yes/no, true/false, on/off' % (
string, optname))
elif string.lower() in ('1', 'yes', 'true', 'on'):
return True
elif string.lower() in ('0', 'no', 'false', 'off'):
return False
else:
raise OptionError('Invalid value %r for option %s; use '
'1/0, yes/no, true/false, on/off' % (
string, optname))
def get_int_opt(options, optname, default=None):
string = options.get(optname, default)
try:
return int(string)
except TypeError:
raise OptionError('Invalid type %r for option %s; you '
'must give an integer value' % (
string, optname))
except ValueError:
raise OptionError('Invalid value %r for option %s; you '
'must give an integer value' % (
string, optname))
def get_list_opt(options, optname, default=None):
val = options.get(optname, default)
if isinstance(val, basestring):
return val.split()
elif isinstance(val, (list, tuple)):
return list(val)
else:
raise OptionError('Invalid type %r for option %s; you '
'must give a list value' % (
val, optname))
def docstring_headline(obj):
if not obj.__doc__:
return ''
res = []
for line in obj.__doc__.strip().splitlines():
if line.strip():
res.append(" " + line.strip())
else:
break
return ''.join(res).lstrip()
def make_analysator(f):
"""
Return a static text analysation function that
returns float values.
"""
def text_analyse(text):
try:
rv = f(text)
except Exception:
return 0.0
if not rv:
return 0.0
try:
return min(1.0, max(0.0, float(rv)))
except (ValueError, TypeError):
return 0.0
text_analyse.__doc__ = f.__doc__
return staticmethod(text_analyse)
def shebang_matches(text, regex):
"""
Check if the given regular expression matches the last part of the
shebang if one exists.
>>> from pygments.util import shebang_matches
>>> shebang_matches('#!/usr/bin/env python', r'python(2\.\d)?')
True
>>> shebang_matches('#!/usr/bin/python2.4', r'python(2\.\d)?')
True
>>> shebang_matches('#!/usr/bin/python-ruby', r'python(2\.\d)?')
False
>>> shebang_matches('#!/usr/bin/python/ruby', r'python(2\.\d)?')
False
>>> shebang_matches('#!/usr/bin/startsomethingwith python',
... r'python(2\.\d)?')
True
It also checks for common windows executable file extensions::
>>> shebang_matches('#!C:\\Python2.4\\Python.exe', r'python(2\.\d)?')
True
Parameters (``'-f'`` or ``'--foo'`` are ignored so ``'perl'`` does
the same as ``'perl -e'``)
Note that this method automatically searches the whole string (eg:
the regular expression is wrapped in ``'^$'``)
"""
index = text.find('\n')
if index >= 0:
first_line = text[:index].lower()
else:
first_line = text.lower()
if first_line.startswith('#!'):
try:
found = [x for x in split_path_re.split(first_line[2:].strip())
if x and not x.startswith('-')][-1]
except IndexError:
return False
regex = re.compile('^%s(\.(exe|cmd|bat|bin))?$' % regex, re.IGNORECASE)
if regex.search(found) is not None:
return True
return False
def doctype_matches(text, regex):
"""
Check if the doctype matches a regular expression (if present).
Note that this method only checks the first part of a DOCTYPE.
eg: 'html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"'
"""
m = doctype_lookup_re.match(text)
if m is None:
return False
doctype = m.group(2)
return re.compile(regex).match(doctype.strip()) is not None
def html_doctype_matches(text):
"""
Check if the file looks like it has a html doctype.
"""
return doctype_matches(text, r'html\s+PUBLIC\s+"-//W3C//DTD X?HTML.*')
_looks_like_xml_cache = {}
def looks_like_xml(text):
"""
Check if a doctype exists or if we have some tags.
"""
key = hash(text)
try:
return _looks_like_xml_cache[key]
except KeyError:
m = doctype_lookup_re.match(text)
if m is not None:
return True
rv = tag_re.search(text[:1000]) is not None
_looks_like_xml_cache[key] = rv
return rv
# Python narrow build compatibility
def _surrogatepair(c):
return (0xd7c0 + (c >> 10), (0xdc00 + (c & 0x3ff)))
def unirange(a, b):
"""
Returns a regular expression string to match the given non-BMP range.
"""
if b < a:
raise ValueError("Bad character range")
if a < 0x10000 or b < 0x10000:
raise ValueError("unirange is only defined for non-BMP ranges")
if sys.maxunicode > 0xffff:
# wide build
return u'[%s-%s]' % (unichr(a), unichr(b))
else:
# narrow build stores surrogates, and the 're' module handles them
# (incorrectly) as characters. Since there is still ordering among
# these characters, expand the range to one that it understands. Some
# background in http://bugs.python.org/issue3665 and
# http://bugs.python.org/issue12749
#
# Additionally, the lower constants are using unichr rather than
# literals because jython [which uses the wide path] can't load this
# file if they are literals.
ah, al = _surrogatepair(a)
bh, bl = _surrogatepair(b)
if ah == bh:
return u'(?:%s[%s-%s])' % (unichr(ah), unichr(al), unichr(bl))
else:
buf = []
buf.append(u'%s[%s-%s]' %
(unichr(ah), unichr(al),
ah == bh and unichr(bl) or unichr(0xdfff)))
if ah - bh > 1:
buf.append(u'[%s-%s][%s-%s]' %
unichr(ah+1), unichr(bh-1), unichr(0xdc00), unichr(0xdfff))
if ah != bh:
buf.append(u'%s[%s-%s]' %
(unichr(bh), unichr(0xdc00), unichr(bl)))
return u'(?:' + u'|'.join(buf) + u')'
# Python 2/3 compatibility
if sys.version_info < (3,0):
b = bytes = str
u_prefix = 'u'
import StringIO, cStringIO
BytesIO = cStringIO.StringIO
StringIO = StringIO.StringIO
uni_open = codecs.open
else:
import builtins
bytes = builtins.bytes
u_prefix = ''
def b(s):
if isinstance(s, str):
return bytes(map(ord, s))
elif isinstance(s, bytes):
return s
else:
raise TypeError("Invalid argument %r for b()" % (s,))
import io
BytesIO = io.BytesIO
StringIO = io.StringIO
uni_open = builtins.open
