Math: implement m:sPre pre-sub-superscript converter (community)

[caio-pizzol]

What

Implement the m:sPre (pre-sub-superscript) OMML → MathML converter. Places subscript and superscript to the LEFT of the base.

OMML: m:sPre → m:sPrePr + m:sub + m:sup + m:e (base)
MathML: with separator
Spec: §22.1.2.99
Difficulty: Medium

Details

MathML <mmultiscripts> structure:

<mmultiscripts>
  base
  <mprescripts/>
  pre-subscript
  pre-superscript
</mmultiscripts>

How to implement

1. Create converters/pre-sub-superscript.ts
2. Build <mmultiscripts> with base, <mprescripts/>, then sub and sup
3. Register as 'm:sPre': convertPreSubSuperscript

Test Document

Download the test file and upload it to the SuperDoc dev app to verify your implementation renders correctly:

sd-2385-prescript.docx

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Ref: SD-2385

[linear]

IT-831

[superdoc-bot]

🎉 This issue is included in @superdoc-dev/react v1.2.0-next.3

The release is available on GitHub release