feat: TA-Lib candlestick patterns — crows & three-line (part 1 of 9) (#130)

* feat: add Two Crows candlestick pattern (CDL2CROWS)

* feat: add Upside Gap Two Crows candlestick pattern (CDLUPSIDEGAP2CROWS)

* feat: add Identical Three Crows candlestick pattern (CDLIDENTICAL3CROWS)

* feat: add Three Line Strike candlestick pattern (CDL3LINESTRIKE)

* feat: add Three Stars in the South candlestick pattern (CDL3STARSINSOUTH)

bindings/python/python/wickra/__init__.py

@@ -240,6 +240,11 @@ from ._wickra import (
     SpinningTop,
     ThreeInside,
     ThreeOutside,
+    TwoCrows,
+    UpsideGapTwoCrows,
+    IdenticalThreeCrows,
+    ThreeLineStrike,
+    ThreeStarsInSouth,
     # Microstructure: order book
     OrderBookImbalanceTop1,
     OrderBookImbalanceTopN,
@@ -507,6 +512,11 @@ __all__ = [
     "SpinningTop",
     "ThreeInside",
     "ThreeOutside",
+    "TwoCrows",
+    "UpsideGapTwoCrows",
+    "IdenticalThreeCrows",
+    "ThreeLineStrike",
+    "ThreeStarsInSouth",
     # Microstructure: order book
     "OrderBookImbalanceTop1",
     "OrderBookImbalanceTopN",

bindings/python/src/lib.rs

@@ -11615,6 +11615,23 @@ candle_pattern_no_param!(PyTweezer, wc::Tweezer, "Tweezer");
 candle_pattern_no_param!(PySpinningTop, wc::SpinningTop, "SpinningTop");
 candle_pattern_no_param!(PyThreeInside, wc::ThreeInside, "ThreeInside");
 candle_pattern_no_param!(PyThreeOutside, wc::ThreeOutside, "ThreeOutside");
+candle_pattern_no_param!(PyTwoCrows, wc::TwoCrows, "TwoCrows");
+candle_pattern_no_param!(
+    PyUpsideGapTwoCrows,
+    wc::UpsideGapTwoCrows,
+    "UpsideGapTwoCrows"
+);
+candle_pattern_no_param!(
+    PyIdenticalThreeCrows,
+    wc::IdenticalThreeCrows,
+    "IdenticalThreeCrows"
+);
+candle_pattern_no_param!(PyThreeLineStrike, wc::ThreeLineStrike, "ThreeLineStrike");
+candle_pattern_no_param!(
+    PyThreeStarsInSouth,
+    wc::ThreeStarsInSouth,
+    "ThreeStarsInSouth"
+);
 
 // ============================== Microstructure: Order Book ==============================
 //
@@ -14112,6 +14129,11 @@ fn _wickra(_py: Python<'_>, m: &Bound<'_, PyModule>) -> PyResult<()> {
     m.add_class::<PySpinningTop>()?;
     m.add_class::<PyThreeInside>()?;
     m.add_class::<PyThreeOutside>()?;
+    m.add_class::<PyTwoCrows>()?;
+    m.add_class::<PyUpsideGapTwoCrows>()?;
+    m.add_class::<PyIdenticalThreeCrows>()?;
+    m.add_class::<PyThreeLineStrike>()?;
+    m.add_class::<PyThreeStarsInSouth>()?;
     // Microstructure: order book.
     m.add_class::<PyOrderBookImbalanceTop1>()?;
     m.add_class::<PyOrderBookImbalanceTopN>()?;

bindings/python/tests/test_new_indicators.py

@@ -523,6 +523,26 @@ CANDLE_SCALAR = {
         lambda: ta.ThreeOutside(),
         lambda ind, h, l, c, v: ind.batch(c, h, l, c),
     ),
+    "TwoCrows": (
+        lambda: ta.TwoCrows(),
+        lambda ind, h, l, c, v: ind.batch(c, h, l, c),
+    ),
+    "UpsideGapTwoCrows": (
+        lambda: ta.UpsideGapTwoCrows(),
+        lambda ind, h, l, c, v: ind.batch(c, h, l, c),
+    ),
+    "IdenticalThreeCrows": (
+        lambda: ta.IdenticalThreeCrows(),
+        lambda ind, h, l, c, v: ind.batch(c, h, l, c),
+    ),
+    "ThreeLineStrike": (
+        lambda: ta.ThreeLineStrike(),
+        lambda ind, h, l, c, v: ind.batch(c, h, l, c),
+    ),
+    "ThreeStarsInSouth": (
+        lambda: ta.ThreeStarsInSouth(),
+        lambda ind, h, l, c, v: ind.batch(c, h, l, c),
+    ),
 }
 
 
@@ -1851,6 +1871,42 @@ def test_three_outside_reference():
     assert t.update((11.5, 13.0, 11.4, 12.5, 1.0, 2)) == pytest.approx(1.0)
 
 
+def test_two_crows_reference():
+    t = ta.TwoCrows()
+    assert t.update((10.0, 12.2, 9.9, 12.0, 1.0, 0)) == pytest.approx(0.0)
+    assert t.update((14.0, 14.2, 12.9, 13.0, 1.0, 1)) == pytest.approx(0.0)
+    assert t.update((13.5, 13.6, 10.9, 11.0, 1.0, 2)) == pytest.approx(-1.0)
+
+
+def test_upside_gap_two_crows_reference():
+    t = ta.UpsideGapTwoCrows()
+    assert t.update((10.0, 12.2, 9.9, 12.0, 1.0, 0)) == pytest.approx(0.0)
+    assert t.update((14.0, 14.2, 12.9, 13.0, 1.0, 1)) == pytest.approx(0.0)
+    assert t.update((15.0, 15.2, 12.4, 12.5, 1.0, 2)) == pytest.approx(-1.0)
+
+
+def test_identical_three_crows_reference():
+    t = ta.IdenticalThreeCrows()
+    assert t.update((13.0, 13.1, 11.9, 12.0, 1.0, 0)) == pytest.approx(0.0)
+    assert t.update((12.0, 12.1, 10.9, 11.0, 1.0, 1)) == pytest.approx(0.0)
+    assert t.update((11.0, 11.1, 9.9, 10.0, 1.0, 2)) == pytest.approx(-1.0)
+
+
+def test_three_line_strike_reference():
+    t = ta.ThreeLineStrike()
+    assert t.update((10.0, 11.1, 9.9, 11.0, 1.0, 0)) == pytest.approx(0.0)
+    assert t.update((10.5, 12.1, 10.4, 12.0, 1.0, 1)) == pytest.approx(0.0)
+    assert t.update((11.5, 13.1, 11.4, 13.0, 1.0, 2)) == pytest.approx(0.0)
+    assert t.update((13.5, 13.6, 9.4, 9.5, 1.0, 3)) == pytest.approx(1.0)
+
+
+def test_three_stars_in_south_reference():
+    t = ta.ThreeStarsInSouth()
+    assert t.update((20.0, 20.1, 8.0, 15.0, 1.0, 0)) == pytest.approx(0.0)
+    assert t.update((18.0, 18.1, 12.0, 16.0, 1.0, 1)) == pytest.approx(0.0)
+    assert t.update((15.0, 15.0, 14.0, 14.0, 1.0, 2)) == pytest.approx(1.0)
+
+
 # --- Lifecycle ------------------------------------------------------------