uses Hashtbl.replace instead of Hashtbl.add so that:

1) extra-entities.xml could be used to override undesired bindings
2) only used mapping are kept in memory at run-time

diff --git a/helm/ocaml/utf8_macros/make_table.ml b/helm/ocaml/utf8_macros/make_table.ml
index cca1d13c44bb8480b4df9cfdc4bed93c06b4d729..377fea64a243a61e52cd2984f03153ce23d4aa38 100644 (file)
--- a/helm/ocaml/utf8_macros/make_table.ml
+++ b/helm/ocaml/utf8_macros/make_table.ml
@@ -37,6 +37,8 @@ let xml_tables = [
   `Entities, "data/entities-table.xml";
   `Dictionary, "data/dictionary-tex.xml";
   `Entities, "data/extra-entities.xml";
+  (** extra-entities.xml should be the last one since it is used to override
+   * previous mappings. Add there overrides as needed. *)
 ]
 
 let iter_gen record_tag name_field value_field f fname =
@@ -62,8 +64,8 @@ let parse_from_xml () =
   let (macro2utf8, utf82macro) = (Hashtbl.create 2000, Hashtbl.create 2000) in
   let add_macro macro utf8 =
     debug_print (sprintf "Adding macro %s = '%s'" macro utf8);
-    Hashtbl.add macro2utf8 macro utf8;
-    Hashtbl.add utf82macro utf8 macro
+    Hashtbl.replace macro2utf8 macro utf8;
+    Hashtbl.replace utf82macro utf8 macro
   in
   let fill_table () =
     List.iter
@@ -84,12 +86,12 @@ let main () =
   let macro2utf8, utf82macro = parse_from_xml () in
   Hashtbl.iter
     (fun macro utf8 ->
-      fprintf oc "let _ = Hashtbl.add macro2utf8 \"%s\" \"%s\"\n"
+      fprintf oc "let _ = Hashtbl.replace macro2utf8 \"%s\" \"%s\"\n"
         macro (String.escaped utf8))
     macro2utf8;
   Hashtbl.iter
     (fun utf8 macro ->
-      fprintf oc "let _ = Hashtbl.add utf82macro \"%s\" \"%s\"\n"
+      fprintf oc "let _ = Hashtbl.replace utf82macro \"%s\" \"%s\"\n"
         (String.escaped utf8) macro)
     utf82macro;
   close_out oc