feat(nlp-service): date range extraction with direction detection

nlp-service/test_extractor.py

@@ -182,3 +182,72 @@ def test_role_receiver_to_english(nlp_en):
     doc = _make_doc_with_ents(nlp_en, "letters to Marie", [(11, 16, "PER")])
     per_spans = list(doc.ents)
     assert detect_person_role(doc, per_spans, "en") == "receiver"
+
+
+# ── Date parsing ─────────────────────────────────────────────────────────────
+
+def test_date_vor_1920(nlp_de):
+    from extractor import extract_dates
+    # "Briefe vor 1920" — "1920" at chars 11..15
+    doc = _make_doc_with_ents(nlp_de, "Briefe vor 1920", [(11, 15, "DATE")])
+    date_from, date_to = extract_dates(doc, "de")
+    assert date_from is None
+    assert date_to == "1920-12-31"
+
+
+def test_date_nach_1900(nlp_de):
+    from extractor import extract_dates
+    # "Briefe nach 1900" — "1900" at chars 12..16
+    doc = _make_doc_with_ents(nlp_de, "Briefe nach 1900", [(12, 16, "DATE")])
+    date_from, date_to = extract_dates(doc, "de")
+    assert date_from == "1900-01-01"
+    assert date_to is None
+
+
+def test_date_zwischen_1900_und_1920(nlp_de):
+    from extractor import extract_dates
+    # "zwischen 1900 und 1920"
+    # "1900" = chars 9..13, "1920" = chars 18..22
+    doc = _make_doc_with_ents(nlp_de, "zwischen 1900 und 1920", [
+        (9, 13, "DATE"),
+        (18, 22, "DATE"),
+    ])
+    date_from, date_to = extract_dates(doc, "de")
+    assert date_from == "1900-01-01"
+    assert date_to == "1920-12-31"
+
+
+def test_date_bare_year_makes_range(nlp_de):
+    from extractor import extract_dates
+    # "Briefe 1920" — no direction token → year-range
+    # "1920" = chars 7..11
+    doc = _make_doc_with_ents(nlp_de, "Briefe 1920", [(7, 11, "DATE")])
+    date_from, date_to = extract_dates(doc, "de")
+    assert date_from == "1920-01-01"
+    assert date_to == "1920-12-31"
+
+
+def test_date_no_date_entity(nlp_de):
+    from extractor import extract_dates
+    doc = _make_doc_with_ents(nlp_de, "Briefe von Opa", [])
+    date_from, date_to = extract_dates(doc, "de")
+    assert date_from is None
+    assert date_to is None
+
+
+def test_date_before_english(nlp_en):
+    from extractor import extract_dates
+    # "letters before 1920" — "1920" at chars 15..19
+    doc = _make_doc_with_ents(nlp_en, "letters before 1920", [(15, 19, "DATE")])
+    date_from, date_to = extract_dates(doc, "en")
+    assert date_from is None
+    assert date_to == "1920-12-31"
+
+
+def test_date_after_english(nlp_en):
+    from extractor import extract_dates
+    # "letters after 1900" — "1900" at chars 14..18
+    doc = _make_doc_with_ents(nlp_en, "letters after 1900", [(14, 18, "DATE")])
+    date_from, date_to = extract_dates(doc, "en")
+    assert date_from == "1900-01-01"
+    assert date_to is None