Labeled alignments

luamml-amsmath.lua

@@ -4,8 +4,8 @@ local save_result = require'luamml-tex'.save_result
 
 local properties = node.get_properties_table()
 
-local funcid = luatexbase.new_luafunction'luamml_amsmath_add_box_to_row:'
-token.set_lua('luamml_amsmath_add_box_to_row:', funcid, 'protected')
+local funcid = luatexbase.new_luafunction'__luamml_amsmath_add_box_to_row:'
+token.set_lua('__luamml_amsmath_add_box_to_row:', funcid, 'protected')
 lua.get_functions_table()[funcid] = function()
   -- TODO: Error handling etc
   -- local box = token.scan_int()
@@ -36,8 +36,8 @@ lua.get_functions_table()[funcid] = function()
   table.insert(mml_row, mml)
 end
 
-local funcid = luatexbase.new_luafunction'luamml_amsmath_finalize_row:'
-token.set_lua('luamml_amsmath_finalize_row:', funcid, 'protected')
+funcid = luatexbase.new_luafunction'__luamml_amsmath_finalize_row:'
+token.set_lua('__luamml_amsmath_finalize_row:', funcid, 'protected')
 lua.get_functions_table()[funcid] = function()
   -- TODO: Error handling etc
   local row_temp = tex.nest[tex.nest.ptr-1]
@@ -59,8 +59,8 @@ lua.get_functions_table()[funcid] = function()
   table.insert(mml_table, mml_row)
 end
 
-local funcid = luatexbase.new_luafunction'luamml_amsmath_finalize_table:'
-token.set_lua('luamml_amsmath_finalize_table:', funcid)
+funcid = luatexbase.new_luafunction'__luamml_amsmath_finalize_table:'
+token.set_lua('__luamml_amsmath_finalize_table:', funcid)
 lua.get_functions_table()[funcid] = function()
   -- TODO: Error handling etc
   local props = properties[tex.lists.align_head]
@@ -70,19 +70,51 @@ lua.get_functions_table()[funcid] = function()
   if not mml_table then return end
   local columns = node.count(node.id'align_record', tex.lists.align_head)//2
   mml_table.columnalign = string.rep('right left', columns, ' ')
-  mml_table.columnspacing = string.rep('0', columns, ' 0.8em ') -- FIXME: 0.3em is a hack needed since MathML doesn't add spacing for our empty mrow
+  local spacing = {}
+  for n in node.traverse_id(node.id'glue', tex.lists.align_head) do
+    spacing[#spacing+1] = n.width == 0 and '0' or '.8em'
+  end
+  mml_table.columnspacing = table.concat(spacing, ' ', 2, #spacing-2)
   save_result(mml_table, 0)
 end
 
-funcid = luatexbase.new_luafunction'luamml_last_math_alignmark:'
-token.set_lua('luamml_last_math_alignmark:', funcid, 'protected')
+local last_tag
+
+funcid = luatexbase.new_luafunction'__luamml_amsmath_save_tag:'
+token.set_lua('__luamml_amsmath_save_tag:', funcid, 'protected')
 lua.get_functions_table()[funcid] = function()
-  local n = tex.nest.top.tail
-  n = n.nucleus or n
-  local props = properties[n]
-  if not props then
-    props = {}
-    properties[n] = props
+  local nest = tex.nest.top
+  local chars = {}
+  for n, id, sub in node.traverse(nest.head.next) do
+    if id == node.id'glyph' then
+      if sub >= 0x100 then
+        texio.write_nl'WARNING: Already shaped glyph detected in tag. This might lead to wrong output.'
+      end
+      chars[#chars+1] = n.char
+    elseif id == node.id'glue' then
+      chars[#chars+1] = 0x20
+    elseif id == node.id'kern' then
+    else
+      print(n)
+      texio.write_nl'WARNING: Unsupported node in tag dropped'
+    end
   end
-  props.mathml_table = {[0] = 'malignmark'}
+  last_tag = utf8.char(table.unpack(chars))
+end
+
+funcid = luatexbase.new_luafunction'__luamml_amsmath_set_tag:'
+token.set_lua('__luamml_amsmath_set_tag:', funcid, 'protected')
+lua.get_functions_table()[funcid] = function()
+  if not last_tag then
+    texio.write_nl'WARNING: Tag extraction failed'
+    return
+  end
+  local row_temp = tex.nest[tex.nest.ptr-1]
+  local props = properties[row_temp]
+  if not props then return end
+  if not props.mathml_row then return end
+  mml_row = props.mathml_row
+  mml_row[0] = 'mlabeledtr'
+  table.insert(mml_row, 1, {[0] = 'mtd', {[0] = 'mtext', last_tag}})
+  last_tag = nil
 end

luamml-patches-amsmath.sty

@@ -17,14 +17,14 @@
         \ifmeasuring@
           \luamml_flag_ignore:
         \else
-        \luamml_flag_save:
+          \luamml_flag_save:
         \fi
       $
     }
     \ifmeasuring@
       \savefieldlength@
     \else
-      \luamml_amsmath_add_box_to_row:
+      \__luamml_amsmath_add_box_to_row:
     \fi
     \set@field
     \tabskip\z@skip
@@ -48,7 +48,7 @@
     \ifmeasuring@
       \savefieldlength@
     \else
-      \luamml_amsmath_add_box_to_row:
+      \__luamml_amsmath_add_box_to_row:
     \fi
     \set@field
     \hfil
@@ -66,7 +66,6 @@
   \add@amps \maxfields@
   \omit
   \kern -\alignsep@
-  \luamml_amsmath_finalize_row:
   \iftag@
     \setboxz@h { 
       \@lign
@@ -74,7 +73,9 @@
       { \make@display@tag }
     }
     \place@tag
+    \__luamml_amsmath_set_tag:
   \fi
+  \__luamml_amsmath_finalize_row:
   \ifst@rred
   \else
     \global \@eqnswtrue
@@ -83,10 +84,19 @@
   \cr
 }
 
+\cs_set:Npn \maketag@@@ #1 {
+  \hbox {
+    \m@th
+    \normalfont
+    #1
+    \__luamml_amsmath_save_tag:
+  }
+}
+
 \cs_set:Npn \endalign {
   \math@cr
   \black@ \totwidth@
-  \luamml_amsmath_finalize_table:
+  \__luamml_amsmath_finalize_table:
   \egroup
   \ifingather@
     \restorealignstate@