unpairedTags matching requires paired tag sibling to work

[nibk]

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• Have you included sample input, output, error, and expected output?
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Description

unpairedTags option doesn't work if not followed immediately by a paired tag, its parent consumes the next sibling.

Input

<root>
  <a>
    <unpaired>
  </a>
  <b>whatever</b>
</root>

Code

As per the API example:

const xmlDataStr = `
<root>
	<a>
		<unpaired>
	</a>
	<b>whatever</b>
</root>
`;

const options = {
  unpairedTags: ["unpaired"]
};
const parser = new XMLParser(options);
const output = parser.parse(xmlDataStr);

Output

{
        "root": {
                "a": {
                        "unpaired": "",
                        "b": "whatever"
                }
        }
}

Correct structure can be generated by changing input to:

<root>
  <a>
    <unpaired><pair>foo</pair>
  </a>
  <b>whatever</b>
</root>

which triggers correct parsing, eg:

{
        "root": {
                "a": {
                        "unpaired": "",
                        "pair": "foo"
                },
                "b": "whatever"
        }
}

expected data

{
        "root": {
                "a": {
                        "unpaired": "",
                },
                "b": "whatever"
        }
}

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[amitguptagwl]

This issue is fixed in v4.2.2,
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