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# Source code for sphinx.builders.devhelp

    # -*- coding: utf-8 -*-
    """
        sphinx.builders.devhelp
        ~~~~~~~~~~~~~~~~~~~~~~~

        Build HTML documentation and Devhelp_ support files.

        .. _Devhelp: http://live.gnome.org/devhelp

        :copyright: Copyright 2007-2016 by the Sphinx team, see AUTHORS.
        :license: BSD, see LICENSE for details.
    """
    from __future__ import absolute_import

    import re
    from os import path

    from docutils import nodes

    from sphinx import addnodes
    from sphinx.builders.html import StandaloneHTMLBuilder

    try:
        import xml.etree.ElementTree as etree
    except ImportError:
        try:
            import lxml.etree as etree
        except ImportError:
            try:
                import elementtree.ElementTree as etree
            except ImportError:
                import cElementTree as etree

    try:
        import gzip

        def comp_open(filename, mode='rb'):
            return gzip.open(filename + '.gz', mode)
    except ImportError:
        def comp_open(filename, mode='rb'):
            return open(filename, mode)

    class DevhelpBuilder(StandaloneHTMLBuilder):
        """
        Builder that also outputs GNOME Devhelp file.
        """
        name = 'devhelp'

        # don't copy the reST source
        copysource = False
        supported_image_types = ['image/png', 'image/gif', 'image/jpeg']

        # don't add links
        add_permalinks = False
        # don't add sidebar etc.
        embedded = True

        def init(self):
            StandaloneHTMLBuilder.init(self)
            self.out_suffix = '.html'
            self.link_suffix = '.html'

        def handle_finish(self):
            self.build_devhelp(self.outdir, self.config.devhelp_basename)

        def build_devhelp(self, outdir, outname):
            self.info('dumping devhelp index...')

            # Basic info
            root = etree.Element('book',
                                 title=self.config.html_title,
                                 name=self.config.project,
                                 link="index.html",
                                 version=self.config.version)
            tree = etree.ElementTree(root)

            # TOC
            chapters = etree.SubElement(root, 'chapters')

            tocdoc = self.env.get_and_resolve_doctree(
                self.config.master_doc, self, prune_toctrees=False)

            def write_toc(node, parent):
                if isinstance(node, addnodes.compact_paragraph) or \
                   isinstance(node, nodes.bullet_list):
                    for subnode in node:
                        write_toc(subnode, parent)
                elif isinstance(node, nodes.list_item):
                    item = etree.SubElement(parent, 'sub')
                    for subnode in node:
                        write_toc(subnode, item)
                elif isinstance(node, nodes.reference):
                    parent.attrib['link'] = node['refuri']
                    parent.attrib['name'] = node.astext()

            def istoctree(node):
                return isinstance(node, addnodes.compact_paragraph) and \
                    'toctree' in node

            for node in tocdoc.traverse(istoctree):
                write_toc(node, chapters)

            # Index
            functions = etree.SubElement(root, 'functions')
            index = self.env.create_index(self)

            def write_index(title, refs, subitems):
                if len(refs) == 0:
                    pass
                elif len(refs) == 1:
                    etree.SubElement(functions, 'function',
                                     name=title, link=refs[0][1])
                else:
                    for i, ref in enumerate(refs):
                        etree.SubElement(functions, 'function',
                                         name="[%d] %s" % (i, title),
                                         link=ref[1])

                if subitems:
                    parent_title = re.sub(r'\s*\(.*\)\s*$', '', title)
                    for subitem in subitems:
                        write_index("%s %s" % (parent_title, subitem[0]),
                                    subitem[1], [])

            for (key, group) in index:
                for title, (refs, subitems, key) in group:
                    write_index(title, refs, subitems)

            # Dump the XML file
            f = comp_open(path.join(outdir, outname + '.devhelp'), 'w')
            try:
                tree.write(f, 'utf-8')
            finally:
                f.close()