mathml/luamml-patches-kernel.sty

\ProvidesExplPackage {luamml-patches-kernel} {2021-05-30} {0.0.1-alpha}
  {Feel free to add a description here}

\cs_new:Npn \__luamml_kernel_phantom:nnn #1#2#3 {
  \hbox_set:Nn \c_zero_int {
    $
    \m@th
    #2
    {#3}
    \luamml_flag_save:nNn {mathphant_#1} #2 {mphantom}
    \luamml_pdf_write:
    $
  }
  \luamml_annotate:nen {1} {
    nucleus = true,
    core = {[0] = 'mpadded',
      \ifh@\else
        width = 0,
      \fi
      \ifv@\else
        height = 0, depth = 0,
      \fi
      data.mathml.mathphant_#1,
    }
  } {
    \finph@nt
  }
}
\cs_generate_variant:Nn \__luamml_kernel_phantom:nnn {V}

\int_new:N \g__luamml_kernel_phantom_int
\cs_set:Npn \mathph@nt {
  \int_gincr:N \g__luamml_kernel_phantom_int
  \__luamml_kernel_phantom:Vnn \g__luamml_kernel_phantom_int
}