Difficulty treating some numeric tags as string

[chris-gilbert-2]

Description

I have an input structure where some numeric values are to be treated as strings. Rather than calling toString in multiple places in my code, I hoped to use the parsing options, but looking at the codebase I think it is not currently possible using either numberOptions or tagValueProcessor.

### Input ```xml 132330 191458 1500 ```

Code

  const options = {
   tagValueProcessor: (tagName: string, tagValue: unknown) =>
      tagName === "id" ? `${tagValue}` : tagValue,
  };
  const parsed =  new XMLParser(options).parse(input);

Output

{
  '?xml': '',
  root: {
    id: 132330,
    nested: { 
      id: 191458, 
      count: 1500 
    } 
  }
}

expected data

{
  '?xml': '',
  root: {
    id: '132330',
    nested: { 
      id: '191458', 
      count: 1500 
    } 
  }
}

I see why there is no conversion - the input type is string and so is the output type, so when the tagValueProcessor is applied, parsing is not skipped.

I can't use the skipLike property of numberParseOptions because strnum only receives the value without the tag name for context. I can't safely use a regex to differentiate IDs from other numbers.

I can't use the parseTagValue option because that is a universal setting that can't be applied to specific tags.

I think the simplest (backward compatible) approach that would work for me, would be another option like parseTagValue, but which takes a function with the same inputs as tagValueProcessor or isArray, and returns boolean, so that enabling parsing can be finer grained.

Would you like to work on this issue?

• [x] Yes
• [ ] No

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