I noticed a lot of complexity in Sphinx due to the fact the nodes cannot be
altered during the EnvironmentCollector phase. However I don't understand
why it works that way.
For example, here below I would like to *tag* each `nodes.title` with an
attribute, but as this is not the same instance, the added information is
lost somewhere.
Does anybody know what is the properway of passing information form the
EnvironmentCollector to the Builder, and then to the Writer?
```python
from docutils import nodes
from sphinx.writers.latex import LaTeXTranslator
from sphinx import addnodes
from sphinx.environment.collectors import EnvironmentCollector
def depart_title(self, node):
if not node['foobar']:
raise ValueError('Why?')
class TitleCollector(EnvironmentCollector):
def get_updated_docs(self, app, env):
def traverse_all(app, env, docname):
doctree = env.get_doctree(docname)
for toc in doctree.traverse(addnodes.toctree):
for _, subdocname in toc['entries']:
traverse_all(app, env, subdocname)
for node in doctree.traverse(nodes.title):
node['foobar'] = 42
traverse_all(app, env, env.config.master_doc)
return []
def clear_doc(self, app, env, docname):
pass
def process_doc(self, app, doctree):
pass
def merge_other(self, app, env, docnames, other):
pass
def setup(app):
app.add_env_collector(TitleCollector)
LaTeXTranslator.depart_title = depart_title
return {
'version': '0.1',
'parallel_read_safe': True,
'parallel_write_safe': True,
}
```
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