reversal/tokeniser.go

@@ -16,6 +16,7 @@
 package reversal
 
 import (
+	"maps"
 	"strings"
 	"unicode/utf8"
 
@@ -644,6 +645,19 @@ func DefaultWeights() map[string]float64 {
 	}
 }
 
+// SignalWeights returns a copy of the tokeniser's configured signal weights.
+//
+// The copy keeps calibration and debugging callers from mutating the live
+// internal map by accident.
+func (t *Tokeniser) SignalWeights() map[string]float64 {
+	if t == nil || len(t.weights) == 0 {
+		return nil
+	}
+	weights := make(map[string]float64, len(t.weights))
+	maps.Copy(weights, t.weights)
+	return weights
+}
+
 func skipDeprecatedEnglishGrammarEntry(key string) bool {
 	switch core.Lower(key) {
 	case "passed", "failed", "skipped":

reversal/tokeniser_test.go

@@ -1305,6 +1305,24 @@ func TestDefaultWeights_ReturnsCopy(t *testing.T) {
 	}
 }
 
+func TestTokeniserSignalWeights_ReturnsCopy(t *testing.T) {
+	setup(t)
+	tok := NewTokeniser(WithWeights(map[string]float64{
+		"noun_determiner": 0.5,
+		"default_prior":   0.1,
+	}))
+
+	weights := tok.SignalWeights()
+	if weights["noun_determiner"] != 0.5 {
+		t.Fatalf("SignalWeights()[noun_determiner] = %v, want 0.5", weights["noun_determiner"])
+	}
+
+	weights["noun_determiner"] = 0
+	if got := tok.SignalWeights()["noun_determiner"]; got != 0.5 {
+		t.Fatalf("SignalWeights() should return a fresh copy, got %v", got)
+	}
+}
+
 func TestTokeniser_LowInformationConfidenceFloor(t *testing.T) {
 	setup(t)
 	tok := NewTokeniser()