hy/site/pygments_extension.py

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2013-03-10 17:59:16 +01:00
# Copyright (c) 2011 Larry Myers <larry@larrymyers.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.
from jinja2 import nodes
from jinja2.ext import Extension
from pygments import highlight
from pygments.formatters import HtmlFormatter
from pygments.lexers import guess_lexer, get_lexer_by_name
class PygmentsExtension(Extension):
"""
A Pygments extension for use with the Jinja2 template language.
Setup:
import PygmentsExtension
from jinja2 import Environment
jinja2_env = Environment(extensions=[PygmentsExtension])
Usage:
{% code 'javascript' %}
function foo() { console.log('bar'); }
{% endcode %}
"""
tags = set(['code'])
def __init__(self, environment):
super(PygmentsExtension, self).__init__(environment)
# add the defaults to the environment
environment.extend(
pygments=self
)
def parse(self, parser):
lineno = parser.stream.next().lineno
args = []
lang_type = parser.parse_expression()
if lang_type is not None:
args.append(lang_type)
body = parser.parse_statements(['name:endcode'], drop_needle=True)
return nodes.CallBlock(self.call_method('_pygmentize', args),
[], [], body).set_lineno(lineno)
def _pygmentize(self, lang_type, caller):
lexer = None
formatter = HtmlFormatter()
content = caller()
if lang_type is None:
lexer = guess_lexer(content)
else:
lexer = get_lexer_by_name(lang_type)
return highlight(content, lexer, formatter)