Multiple extensions that extends a translator ?

[Yves Chevallier]

I am writing an extension that uses `listings` instead of `SphinxVerbatim`. This extension extends the current translator:

def setup(app):
 app.set_translator('latex', MyLaTeXTranslator)

 return {
 'version': '0.1',
 'parallel_read_safe': True,
 'parallel_write_safe': True,
 }

Then I want to write another extension that adds a colored frame around the code

from sphinx.writers.latex import LaTeXTranslator

class Translator(LaTeXTranslator):
 def visit_literal_block(self, node):
 return ''.join([
 'foo',
 super().visit_literal_block(node),
 'bar'
 ])

def setup(app):
 app.set_translator('latex', Translator)

 return {
 'version': '0.1',
 'parallel_read_safe': True,
 'parallel_write_safe': True,
 }

Unfortunately this lead to an error: 

sphinx.errors.ExtensionError: Translator for 'latex' already exists


Extension error:
Translator for 'latex' already exists

What is the proper way to do this?

[Komiya Takeshi]

Hi,

Unfortunately, we can't use two translators at the same time. Only one
translator can be registered to the specific builder. So it would be
better to integrate these translators to a single one.

As a workaround, you can override the method of the default
LaTeXTranslator via assigning method::

from sphinx.writers.latex import LaTeXTranslator

original_visit_literal_block = LaTeXTranslator.visit_literal_block

def my_visit_literal_block(self, node):
...

LaTeXTranslator.visit_literal_block = my_visit_literal_block

Thanks,
Takeshi KOMIYA

2020年8月7日(金) 21:12 Yves Chevallier <cana...@gmail.com>:

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[Daniel Scott]

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