from & to ts of a ref anno is derived from referenced annotation

speach/elan.py

@@ -52,6 +52,7 @@ def ts(self):
 
     @property
     def sec(self):
+        """ Get TimeSlot value in seconds instead of milliseconds """
         return self.value / 1000 if self.value is not None else None
 
     def __lt__(self, other):
@@ -84,6 +85,9 @@ def __sub__(self, other):
     def __hash__(self):
         return id(self)
 
+    def __repr__(self):
+        return f"TimeSlot(value={repr(self.value)})"
+
     def __str__(self):
         val = self.ts
         return val if val else self.ID
@@ -166,6 +170,14 @@ def __init__(self, ID, ref_id, previous, value, xml_node=None, **kwargs):
     def ref(self):
         return self.__ref
 
+    @property
+    def from_ts(self):
+        return self.__ref.from_ts if self.__ref is not None else None
+
+    @property
+    def to_ts(self):
+        return self.__ref.to_ts if self.__ref is not None else None
+
     def resolve(self, elan_doc):
         _ref_ann = elan_doc.annotation(self.__ref_id)
         if _ref_ann is None:

test/test_elan.py

@@ -126,6 +126,15 @@ def test_write_elan(self):
         eaf = read_eaf()
         self.assertTrue(eaf.to_xml_bin())
 
+    def test_ref_ann(self):
+        eaf = read_eaf()
+        ann = eaf['Person1 (Language)'][0]
+        self.assertIsNotNone(ann.ref)
+        self.assertEqual(ann.from_ts, 1040)
+        self.assertEqual(ann.to_ts, 2330)
+        self.assertEqual(ann.from_ts.sec, 1.04)
+        self.assertEqual(ann.to_ts.sec, 2.33)
+
 
 # -------------------------------------------------------------------------------
 # MAIN