# Source code for ebooklib.plugins.sourcecode

    # This file is part of EbookLib.
    # Copyright (c) 2013 Aleksandar Erkalovic <aerkalov@gmail.com>
    #
    # EbookLib is free software: you can redistribute it and/or modify
    # it under the terms of the GNU Affero General Public License as published by
    # the Free Software Foundation, either version 3 of the License, or
    # (at your option) any later version.
    #
    # EbookLib is distributed in the hope that it will be useful,
    # but WITHOUT ANY WARRANTY; without even the implied warranty of
    # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    # GNU Affero General Public License for more details.
    #
    # You should have received a copy of the GNU Affero General Public License
    # along with EbookLib.  If not, see <http://www.gnu.org/licenses/>.

    from ebooklib.plugins.base import BasePlugin
    from ebooklib.utils import parse_html_string

    class SourceHighlighter(BasePlugin):
        def __init__(self):
            pass

        def html_before_write(self, book, chapter):
            from lxml import etree, html

            from pygments import highlight
            from pygments.formatters import HtmlFormatter

            from ebooklib import epub

            try:
                tree = parse_html_string(chapter.content)
            except:
                return

            root = tree.getroottree()

            had_source = False

            if len(root.find('body')) != 0:
                body = tree.find('body')
                # check for embeded source
                for source in body.xpath('//pre[contains(@class,"source-")]'):
                    css_class = source.get('class')

                    source_text = (source.text or '') + ''.join([html.tostring(child) for child in source.iterchildren()])

                    if 'source-python' in css_class:
                        from pygments.lexers import PythonLexer

    #                    _text =  highlight(source_text, PythonLexer(), HtmlFormatter(linenos="inline"))
                        _text =  highlight(source_text, PythonLexer(), HtmlFormatter())

                    if 'source-css' in css_class:
                        from pygments.lexers import CssLexer

                        _text =  highlight(source_text, CssLexer(), HtmlFormatter())

                    _parent = source.getparent()
                    _parent.replace(source, etree.XML(_text))

                    had_source = True

            if had_source:
                chapter.add_link(href="style/code.css", rel="stylesheet", type="text/css")
                chapter.content = etree.tostring(tree, pretty_print=True, encoding='utf-8')