Documentation/sphinx/translations.py

   1 # SPDX-License-Identifier: GPL-2.0
   2 #
   3 # Copyright © 2023, Oracle and/or its affiliates.
   4 # Author: Vegard Nossum <vegard.nossum@oracle.com>
   5 #
   6 # Add translation links to the top of the document.
   7 #
   8
   9 import os
  10
  11 from docutils import nodes
  12 from docutils.transforms import Transform
  13
  14 import sphinx
  15 from sphinx import addnodes
  16 from sphinx.errors import NoUri
  17
  18 all_languages = {
  19     # English is always first
  20     None: 'English',
  21
  22     # Keep the rest sorted alphabetically
  23     'zh_CN': 'Chinese (Simplified)',
  24     'zh_TW': 'Chinese (Traditional)',
  25     'it_IT': 'Italian',
  26     'ja_JP': 'Japanese',
  27     'ko_KR': 'Korean',
  28     'sp_SP': 'Spanish',
  29 }
  30
  31 class LanguagesNode(nodes.Element):
  32     pass
  33
  34 class TranslationsTransform(Transform):
  35     default_priority = 900
  36
  37     def apply(self):
  38         app = self.document.settings.env.app
  39         docname = self.document.settings.env.docname
  40
  41         this_lang_code = None
  42         components = docname.split(os.sep)
  43         if components[0] == 'translations' and len(components) > 2:
  44             this_lang_code = components[1]
  45
  46             # normalize docname to be the untranslated one
  47             docname = os.path.join(*components[2:])
  48
  49         new_nodes = LanguagesNode()
  50         new_nodes['current_language'] = all_languages[this_lang_code]
  51
  52         for lang_code, lang_name in all_languages.items():
  53             if lang_code == this_lang_code:
  54                 continue
  55
  56             if lang_code is None:
  57                 target_name = docname
  58             else:
  59                 target_name = os.path.join('translations', lang_code, docname)
  60
  61             pxref = addnodes.pending_xref('', refdomain='std',
  62                 reftype='doc', reftarget='/' + target_name, modname=None,
  63                 classname=None, refexplicit=True)
  64             pxref += nodes.Text(lang_name)
  65             new_nodes += pxref
  66
  67         self.document.insert(0, new_nodes)
  68
  69 def process_languages(app, doctree, docname):
  70     for node in doctree.traverse(LanguagesNode):
  71         if app.builder.format not in ['html']:
  72             node.parent.remove(node)
  73             continue
  74
  75         languages = []
  76
  77         # Iterate over the child nodes; any resolved links will have
  78         # the type 'nodes.reference', while unresolved links will be
  79         # type 'nodes.Text'.
  80         languages = list(filter(lambda xref:
  81             isinstance(xref, nodes.reference), node.children))
  82
  83         html_content = app.builder.templates.render('translations.html',
  84             context={
  85                 'current_language': node['current_language'],
  86                 'languages': languages,
  87             })
  88
  89         node.replace_self(nodes.raw('', html_content, format='html'))
  90
  91 def setup(app):
  92     app.add_node(LanguagesNode)
  93     app.add_transform(TranslationsTransform)
  94     app.connect('doctree-resolved', process_languages)
  95
  96     return {
  97         'parallel_read_safe': True,
  98         'parallel_write_safe': True,
  99     }