planned dehyphenation of lambdadelta eventually took place!

[helm.git] / helm / www / lambdadelta / bin / xhtbl / pass1.ml

diff --git a/helm/www/lambdadelta/bin/xhtbl/pass1.ml b/helm/www/lambdadelta/bin/xhtbl/pass1.ml
new file mode 100644 (file)
index 0000000..1c53e7d
--- /dev/null
+++ b/helm/www/lambdadelta/bin/xhtbl/pass1.ml
@@ -0,0 +1,86 @@
+module L = List
+
+module T = Table
+module F = Fold
+
+type status = {
+   ts: T.size; (* current dimensions *)
+   tc: T.css;  (* current class *)
+}
+
+let empty = {
+   ts = T.no_size; tc = [];
+}
+
+let init b ts =
+   if b then
+      {ts with T.ri = max_int; T.ci = 0}
+   else
+      {ts with T.ri = 0; T.ci = max_int}
+
+let combine b ts1 ts2 =
+   if b then    
+      {ts1 with 
+         T.rf = max ts1.T.rf ts2.T.rf; T.ri = min ts1.T.ri ts2.T.ri; 
+        T.cf = ts1.T.cf + ts2.T.cf; T.ci = ts1.T.ci + ts2.T.ci;
+      }
+   else
+      {ts1 with
+         T.cf = max ts1.T.cf ts2.T.cf; T.ci = min ts1.T.ci ts2.T.ci;
+        T.rf = ts1.T.rf + ts2.T.rf; T.ri = ts1.T.ri + ts2.T.ri; 
+      }
+
+let deinit ts = {ts with
+   T.ri = if ts.T.ri = max_int then 0 else ts.T.ri;
+   T.ci = if ts.T.ci = max_int then 0 else ts.T.ci;
+}
+
+(****************************************************************************)
+
+let open_table st t =
+   t.T.tc <- t.T.tc @ st.tc;
+   {st with tc = t.T.tc}
+
+let close_table st t =
+   t.T.ts <- st.ts; st
+
+let map_key st k = 
+   let ts = match k, st.ts.T.p with
+      | T.Text _     , _          ->
+         {st.ts with T.rf = 1; T.cf = 1; T.ri = 0; T.ci = 0}
+      | T.Glue None  , _          ->
+         {st.ts with T.rf = 0; T.cf = 0; T.ri = 1; T.ci = 1}
+      | T.Glue Some g, Some false ->
+         {st.ts with T.rf = g; T.cf = 0; T.ri = 0; T.ci = 1}
+      | T.Glue Some g, Some true  ->
+         {st.ts with T.rf = 0; T.cf = g; T.ri = 1; T.ci = 0}
+      | T.Glue Some g, None       ->
+         {st.ts with T.rf = g; T.cf = g; T.ri = 0; T.ci = 0}
+   in
+   {st with ts = ts}
+
+let open_line b st =
+   let ts = init b st.ts in
+   let ts = {ts with T.rf = 0; T.cf = 0} in
+   {st with ts = ts}
+
+let open_entry b st =
+   let ts = {st.ts with T.p = Some b} in
+   {st with ts = ts}
+
+let close_entry b st sst =
+   {st with ts = combine b st.ts sst.ts}
+
+let close_line b st =
+   {st with ts = deinit st.ts}
+
+let cb = {
+   F.open_table = open_table; F.close_table = close_table;   
+   F.open_line = open_line; F.close_line = close_line;
+   F.open_entry = open_entry; F.close_entry = close_entry;
+   F.map_key = map_key;
+}
+
+let process t =
+   let st = F.fold_table cb empty t in
+   st.ts