Support \smash and cleanup

luamml-patches-kernel.sty

@@ -1,14 +1,34 @@
 \ProvidesExplPackage {luamml-patches-kernel} {2024-08-14} {0.1.0}
   {Feel free to add a description here}
 
-\cs_new:Npn \__luamml_kernel_phantom:nnn #1#2#3 {
+\cs_set:Npn \mathsm@sh #1 #2 {
+  \setbox \z@ \hbox {
+    $
+    \m@th #1 {
+      #2
+    }
+    \luamml_flag_save:nNn {mathsmash} #1 {mpadded}
+    \luamml_pdf_write:
+    $
+  }
+  \luamml_annotate:nen {2} {
+    nucleus = true,
+    core = consume_label('mathsmash', function(padded)
+      padded.height, padded.depth = 0, 0~
+    end),
+  } {
+    {}
+    \finsm@sh
+  }
+}
+
+\cs_set:Npn \mathph@nt #1 #2 {
   \setbox \z@ = \hbox {
     $
     \m@th
-    #2
-    {#3}
-    \luamml_flag_save:nNn {mathphant_#1} #2 {mphantom}
-    \luamml_pdf_write:
+    #1
+    {#2}
+    \luamml_flag_save:nNn {mathphant} #1 {mphantom}
     $
   }
   \luamml_annotate:nen {1} {
@@ -20,19 +40,12 @@
       \ifv@\else
         height = 0, depth = 0,
       \fi
-      data.mathml.mathphant_#1,
+      consume_label'mathphant',
     }
   } {
     \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
-}
 
 \@ifpackageloaded {unicode-math} {} {
   \cs_new:Npn \__luamml_kernel_define_character:Nnn #1#2#3 {

luamml-tex-annotate.lua

@@ -6,6 +6,15 @@ local mark_environment = {
   data = {
   },
 }
+do
+  local _ENV = mark_environment
+  function consume_label(label, fn)
+    local mathml = data.mathml[label]
+    data.mathml[label] = nil
+    if fn then fn(mathml) end
+    return mathml
+  end
+end
 
 local function annotate()
   local annotation, err = load( 'return {'