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+(** Sonority module for determining the sonority of phonetic segments.
+
+    This module provides functionality to determine the sonority of IPA
+    (International Phonetic Alphabet) segments on a scale of 1 to 9, where:
+    - 9: Low vowels (most sonorous)
+    - 8: High vowels
+    - 7: Glides/approximants
+    - 6: Liquids
+    - 5: Nasals
+    - 4: Voiced fricatives
+    - 3: Voiceless fricatives
+    - 2: Voiced stops
+    - 1: Voiceless stops (least sonorous) *)
+
+(** Decision tree for computing sonority values *)
+type bool_tree =
+  | Leaf of int  (** Terminal node with sonority value *)
+  | Node of {
+      test : Feature.segment -> bool;  (** Test function *)
+      t_branch : bool_tree;  (** Branch to follow if test is true *)
+      f_branch : bool_tree;  (** Branch to follow if test is false *)
+    }
+
+(** Main Sonority module functionality *)
+module Sonority = struct
+  (** Initialize the module by loading IPA data *)
+  let init data_dir =
+    let csv_file = Filename.concat data_dir "ipa_all.csv" in
+    Ipa_tableold.load_csv csv_file
+
+  (** Build the decision tree for sonority calculation *)
+  let build_tree () =
+    let open Feature in
+    let plusSyl = test (Syllabic, Plus) in
+    let minusHi = test (High, Minus) in
+    let minusCons = test (Consonantal, Minus) in
+    let plusSon = test (Sonorant, Plus) in
+    let minusNas = test (Nasal, Minus) in
+    let plusCont = test (Continuant, Plus) in
+    let plusVoi = test (Voiced, Plus) in
+
+    (* Build the tree bottom-up *)
+    let minusHi_branch =
+      Node
+        {
+          test = minusHi;
+          t_branch = Leaf 9;
+          (* -hi vowels = low vowels *)
+          f_branch = Leaf 8;
+          (* +hi vowels = high vowels *)
+        }
+    in
+
+    let plusVoi1_branch =
+      Node
+        {
+          test = plusVoi;
+          t_branch = Leaf 4;
+          (* +voi +cont = voiced fricatives *)
+          f_branch = Leaf 3;
+          (* -voi +cont = voiceless fricatives *)
+        }
+    in
+
+    let plusVoi2_branch =
+      Node
+        {
+          test = plusVoi;
+          t_branch = Leaf 2;
+          (* +voi -cont = voiced stops *)
+          f_branch = Leaf 1;
+          (* -voi -cont = voiceless stops *)
+        }
+    in
+
+    let plusCont_branch =
+      Node
+        {
+          test = plusCont;
+          t_branch = plusVoi1_branch;
+          (* +cont = fricatives *)
+          f_branch = plusVoi2_branch;
+          (* -cont = stops *)
+        }
+    in
+
+    let minusNas_branch =
+      Node
+        {
+          test = minusNas;
+          t_branch = Leaf 6;
+          (* -nas +son = liquids *)
+          f_branch = Leaf 5;
+          (* +nas +son = nasals *)
+        }
+    in
+
+    let plusSon_branch =
+      Node
+        {
+          test = plusSon;
+          t_branch = minusNas_branch;
+          (* +son = sonorants *)
+          f_branch = plusCont_branch;
+          (* -son = obstruents *)
+        }
+    in
+
+    let minusCons_branch =
+      Node
+        {
+          test = minusCons;
+          t_branch = Leaf 7;
+          (* -cons = glides *)
+          f_branch = plusSon_branch;
+          (* +cons = true consonants *)
+        }
+    in
+
+    Node
+      {
+        test = plusSyl;
+        t_branch = minusHi_branch;
+        (* +syl = vowels *)
+        f_branch = minusCons_branch;
+        (* -syl = non-vowels *)
+      }
+
+  (** Evaluate the decision tree for a segment *)
+  let rec eval_tree tree segment =
+    match tree with
+    | Leaf value -> value
+    | Node { test; t_branch; f_branch } ->
+        if test segment then eval_tree t_branch segment
+        else eval_tree f_branch segment
+
+  (** The main decision tree instance *)
+  let sonority_tree = lazy (build_tree ())
+
+  (** Get sonority value from feature specifications *)
+  let sonority_from_features segment =
+    eval_tree (Lazy.force sonority_tree) segment
+
+  (** Get sonority value from an IPA character *)
+  let sonority ipa =
+    match Ipa_tableold.lookup_segment ipa with
+    | Some features -> sonority_from_features features
+    | None -> failwith (Printf.sprintf "Unknown IPA segment: %s" ipa)
+end
+
+(** Public interface *)
+
+(** Initialize the sonority module with the data directory *)
+let init = Sonority.init
+
+(** Get the sonority value (1-9) for an IPA character *)
+let sonority = Sonority.sonority
+
+(** Get the sonority value from a feature specification *)
+let sonority_from_features = Sonority.sonority_from_features