83 lines
2.5 KiB
Python
83 lines
2.5 KiB
Python
# -*- coding: utf8 -*-
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import sys
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from jinja2 import nodes
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from jinja2.ext import Extension, Markup
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from pygments import highlight
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from pygments.lexers import get_lexer_by_name, guess_lexer
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from pygments.formatters import HtmlFormatter
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from pygments.util import ClassNotFound
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from i2p2www.lexers import DataSpecLexer
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class HighlightExtension(Extension):
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"""Highlight code blocks using Pygments
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Example::
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{% highlight 'python' %}
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from fridge import Beer
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pint_glass = Beer()
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pint_glass.drink()
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{% endhighlight %}
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"""
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tags = set(['highlight'])
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def parse(self, parser):
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lineno = parser.stream.next().lineno
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# extract the language if available
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# Any additional parameters are passed to HtmlFormatter
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lang = None
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parameters = []
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while parser.stream.current.type != 'block_end':
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if lang or parameters:
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parser.stream.expect('comma')
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name = parser.stream.expect('name')
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if name.value in parameters or (name.value == 'lang' and lang):
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parser.fail('parameter %r defined twice.' %
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name.value, name.lineno,
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exc=TemplateAssertionError)
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if parser.stream.current.type == 'assign':
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next(parser.stream)
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if name.value == 'lang':
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lang = parser.parse_expression()
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else:
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parameters.append(nodes.Pair(nodes.Const(name.value), parser.parse_expression()))
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if lang == None:
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lang = nodes.Const(None)
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parameters = nodes.Dict(parameters)
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# body of the block
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body = parser.parse_statements(['name:endhighlight'], drop_needle=True)
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return nodes.CallBlock(self.call_method('_highlight', [lang, parameters]),
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[], [], body).set_lineno(lineno)
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def _highlight(self, lang, parameters, caller=None):
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# highlight code using Pygments
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body = caller()
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try:
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if lang is None:
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lexer = guess_lexer(body)
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else:
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lexer = get_lexer_by_name(lang, stripall=False)
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except ClassNotFound as e:
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if lang == 'dataspec':
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lexer = DataSpecLexer(stripall=False)
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else:
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print(e)
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sys.exit(1)
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formatter = HtmlFormatter(**parameters)
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code = highlight(Markup(body).unescape(), lexer, formatter)
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return code
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