add glyph name <-> codepoint resolver

2 files changed, 78 insertions, 0 deletions

diff --git a/luaotfload-auxiliary.lua b/luaotfload-auxiliary.lua
index a5f22dd..f7886be 100644
--- a/luaotfload-auxiliary.lua
+++ b/luaotfload-auxiliary.lua
@@ -174,6 +174,44 @@ end
 
 aux.do_if_glyph_else = do_if_glyph_else
 
+--- this one is approximately “name_to_slot” from the microtype
+--- package
+
+--- string -> (int | false)
+local codepoint_of_name = function (glyphname)
+  local fontdata = identifiers[font.current()]
+  if fontdata then
+    local unicode = fontdata.resources.unicodes[glyphname]
+    if unicode and type(unicode) == "number" then
+      return unicode
+    else
+      return unicode[1] --- again, does that even happen?
+    end
+  end
+  return false
+end
+
+aux.codepoint_of_name = codepoint_of_name
+
+--- inverse of above
+
+local indices
+
+--- int -> (string | false)
+local name_of_codepoint = function (codepoint)
+  if not indices then --- this will load the glyph list
+    local unicodes = fonts.encodings.agl.unicodes
+    indices = table.swapped(unicodes)
+  end
+  local glyphname = indices[codepoint]
+  if glyphname then
+    return glyphname
+  end
+  return false
+end
+
+aux.name_of_codepoint = name_of_codepoint
+
 -----------------------------------------------------------------------
 ---                 features / scripts / languages
 -----------------------------------------------------------------------
diff --git a/tests/pln-aux-4.tex b/tests/pln-aux-4.tex
new file mode 100644
index 0000000..b025561
--- /dev/null
+++ b/tests/pln-aux-4.tex
@@ -0,0 +1,40 @@
+\input luaotfload.sty
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% unicode character mappings
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\font\ptserifregular = file:PTF55F.ttf \ptserifregular
+
+%% here we map the function luaotfload.aux.name_of_codepoint
+%% on a short text, printing a list of letters, their codepoints
+%% and names (as specified in the Adobe Glyph List).
+
+\directlua{
+  local aux = luaotfload.aux
+  local cbk = function (str)
+    if string.match(str, "^EOF") then
+      luatexbase.remove_from_callback("process_input_buffer", "weird")
+      return [[the end!]]
+    end
+    local res = { }
+    for chr in string.utfcharacters(str) do
+      local val = unicode.utf8.byte(chr)
+      local line = chr .. " <> " .. tostring(val)
+      line = line .. " <> " .. (aux.name_of_codepoint(val) or "")
+      res[\string#res+1] = line
+    end
+    return table.concat(res, [[\endgraf]])
+  end
+
+  luatexbase.add_to_callback("process_input_buffer", cbk, "weird")
+}
+
+Я узнал что у меня
+Есть огромная семья
+И тропинка и лесок
+В поле каждый колосок
+
+EOF
+
+\bye