[FIX] tab-item label error

[Praecordi]

I'm not used to submitting pull requests so please excuse me if I've made any mistakes.

For my project, I had created a custom role which changed the color of specific words. Using such words in tab labels was not possible. I noticed in the code that the regions which did not allow this were missing arguments in nodes.rubric and sd_tab_label, both of which are nodes.TextElement.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5ad542b) 89.97% compared to head (37a3104) 89.97%.

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@@           Coverage Diff           @@
##             main     #135   +/-   ##
=======================================
  Coverage   89.97%   89.97%           
=======================================
  Files          11       11           
  Lines         948      948           
=======================================
  Hits          853      853           
  Misses         95       95           

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[chrisjsewell]

Heya thanks for the PR, so your change relates to https://github.com/live-clones/docutils/blob/6de53a0de5415174d58e775110d89e13dd76fc83/docutils/docutils/nodes.py#L1129:

class Element:
    def __init__(self, rawsource='', text='', *children, **attributes):
        if text != '':
            textnode = Text(text)
            Element.__init__(self, rawsource, textnode, *children,
                             **attributes)
        else:
            Element.__init__(self, rawsource, *children, **attributes)

By adding the extra "", I don't see what this will change, since in both cases text == ""?

Do you have a "minimally reproducible example" of the problem?
i.e. it would be ideal to be able to write (an initially failing) test for this issue, then add code that makes the test parse.

[Praecordi]

Not necessarily. When we call tab_label = nodes.rubric(self.arguments[0], *textnodes, classes=["sd-tab-label"] + self.options.get("class-label", [])) (without the extra ""), it uses the first element of textnodes since the arbitrary argument is processed first, and then its first element is set as the positional argument text. Explicitly putting "" sets the text = "" by virtue of its position.

def test(rawsource = '', text = '', *children, **attributes):
    print("text", text)
    print(children)

lst = ["hello.1", "hello.2", "hello.3"]

test("", *lst)
'''
Outputs
text hello.1
('hello.2', 'hello.3')
'''
test("", "", *lst)
"""
Outputs
text 
('hello.1', 'hello.2', 'hello.3')
"""

Please let me know if this explanation is enough, or if you would still like me to provide minimally reproducible example of the initial issue.

[Praecordi]

Due to a lack of reply, I thought I may as well provide an example. This is a snippet of rst which I use

.. role:: custom-role
.. default-role:: custom-role

Minimally Reproducible Example for Tab Error
--------------------------------------------

This snippet is placed in _static directory titled "custom-role.css" and the line :code:`html_css_files = ["custom-role.css"]` in the conf.py

.. code:: css

    .custom-role {
        color: red;
        font-style: italic;
    }

.. tab-set::
    
    .. tab-item:: :custom-role:`Tab 1`
    
        This tab is supposed to be colored red and italicized, similar to :custom-role:`this`.
        
    .. tab-item:: Tab 2
    
        This is not

To make the custom-role more noticeable I add a css snippet in the configuration file by the name of custom-role.css. I have the snippet in the rst above.

This is an image of the output before the fix:

And this an image after:

Let me know if this is okay for the test.

[Praecordi]

@chrisjsewell What do you think?