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# -*- coding: utf-8 -*-
"""
sphinx.highlighting
~~~~~~~~~~~~~~~~~~~
Highlight code blocks using Pygments.
:copyright: Copyright 2007-2017 by the Sphinx team, see AUTHORS.
:license: BSD, see LICENSE for details.
"""
from six import text_type
from sphinx.util import logging
from sphinx.util.pycompat import htmlescape
from sphinx.util.texescape import tex_hl_escape_map_new
from sphinx.ext import doctest
from pygments import highlight
from pygments.lexer import Lexer # NOQA
from pygments.lexers import PythonLexer, Python3Lexer, PythonConsoleLexer, \
CLexer, TextLexer, RstLexer
from pygments.lexers import get_lexer_by_name, guess_lexer
from pygments.formatters import HtmlFormatter, LatexFormatter
from pygments.filters import ErrorToken
from pygments.styles import get_style_by_name
from pygments.util import ClassNotFound
from sphinx.pygments_styles import SphinxStyle, NoneStyle
if False:
# For type annotation
from typing import Any, Dict # NOQA
from pygments.formatter import Formatter # NOQA
logger = logging.getLogger(__name__)
lexers = dict(
none = TextLexer(stripnl=False),
python = PythonLexer(stripnl=False),
python3 = Python3Lexer(stripnl=False),
pycon = PythonConsoleLexer(stripnl=False),
pycon3 = PythonConsoleLexer(python3=True, stripnl=False),
rest = RstLexer(stripnl=False),
c = CLexer(stripnl=False),
) # type: Dict[unicode, Lexer]
for _lexer in lexers.values():
_lexer.add_filter('raiseonerror')
escape_hl_chars = {ord(u'\\'): u'\\PYGZbs{}',
ord(u'{'): u'\\PYGZob{}',
ord(u'}'): u'\\PYGZcb{}'}
# used if Pygments is available
# use textcomp quote to get a true single quote
_LATEX_ADD_STYLES = r'''
\renewcommand\PYGZsq{\textquotesingle}
'''
class PygmentsBridge(object):
# Set these attributes if you want to have different Pygments formatters
# than the default ones.
html_formatter = HtmlFormatter
latex_formatter = LatexFormatter
def __init__(self, dest='html', stylename='sphinx', trim_doctest_flags=False):
# type: (unicode, unicode, bool) -> None
self.dest = dest
if stylename is None or stylename == 'sphinx':
style = SphinxStyle
elif stylename == 'none':
style = NoneStyle
elif '.' in stylename:
module, stylename = stylename.rsplit('.', 1)
style = getattr(__import__(module, None, None, ['__name__']),
stylename)
else:
style = get_style_by_name(stylename)
self.trim_doctest_flags = trim_doctest_flags
self.formatter_args = {'style': style} # type: Dict[unicode, Any]
if dest == 'html':
self.formatter = self.html_formatter
else:
self.formatter = self.latex_formatter
self.formatter_args['commandprefix'] = 'PYG'
def get_formatter(self, **kwargs):
# type: (Any) -> Formatter
kwargs.update(self.formatter_args) # type: ignore
return self.formatter(**kwargs)
def unhighlighted(self, source):
# type: (unicode) -> unicode
if self.dest == 'html':
return '<pre>' + htmlescape(source) + '</pre>\n'
else:
# first, escape highlighting characters like Pygments does
source = source.translate(escape_hl_chars)
# then, escape all characters nonrepresentable in LaTeX
source = source.translate(tex_hl_escape_map_new)
return '\\begin{Verbatim}[commandchars=\\\\\\{\\}]\n' + \
source + '\\end{Verbatim}\n'
def highlight_block(self, source, lang, opts=None, location=None, force=False, **kwargs):
# type: (unicode, unicode, Any, Any, bool, Any) -> unicode
if not isinstance(source, text_type):
source = source.decode()
# find out which lexer to use
if lang in ('py', 'python'):
if source.startswith('>>>'):
# interactive session
lexer = lexers['pycon']
else:
lexer = lexers['python']
elif lang in ('py3', 'python3', 'default'):
if source.startswith('>>>'):
lexer = lexers['pycon3']
else:
lexer = lexers['python3']
elif lang == 'guess':
try:
lexer = guess_lexer(source)
except Exception:
lexer = lexers['none']
else:
if lang in lexers:
lexer = lexers[lang]
else:
try:
lexer = lexers[lang] = get_lexer_by_name(lang, **(opts or {}))
except ClassNotFound:
logger.warning('Pygments lexer name %r is not known', lang,
location=location)
lexer = lexers['none']
else:
lexer.add_filter('raiseonerror')
# trim doctest options if wanted
if isinstance(lexer, PythonConsoleLexer) and self.trim_doctest_flags:
source = doctest.blankline_re.sub('', source) # type: ignore
source = doctest.doctestopt_re.sub('', source) # type: ignore
# highlight via Pygments
formatter = self.get_formatter(**kwargs)
try:
hlsource = highlight(source, lexer, formatter)
except ErrorToken:
# this is most probably not the selected language,
# so let it pass unhighlighted
if lang == 'default':
pass # automatic highlighting failed.
else:
logger.warning('Could not lex literal_block as "%s". '
'Highlighting skipped.', lang,
type='misc', subtype='highlighting_failure',
location=location)
hlsource = highlight(source, lexers['none'], formatter)
if self.dest == 'html':
return hlsource
else:
if not isinstance(hlsource, text_type): # Py2 / Pygments < 1.6
hlsource = hlsource.decode()
return hlsource.translate(tex_hl_escape_map_new)
def get_stylesheet(self):
# type: () -> unicode
formatter = self.get_formatter()
if self.dest == 'html':
return formatter.get_style_defs('.highlight')
else:
return formatter.get_style_defs() + _LATEX_ADD_STYLES
|
