feat: init the repo

src/pattern/cdleveningstar.rs

@@ -0,0 +1,51 @@
+use numpy::{IntoPyArray, PyArray1, PyReadonlyArray1};
+use pyo3::prelude::*;
+
+use super::common::*;
+
+#[pyfunction]
+pub fn cdleveningstar<'py>(
+    py: Python<'py>,
+    open: PyReadonlyArray1<'py, f64>,
+    high: PyReadonlyArray1<'py, f64>,
+    low: PyReadonlyArray1<'py, f64>,
+    close: PyReadonlyArray1<'py, f64>,
+) -> PyResult<Bound<'py, PyArray1<i32>>> {
+    let opens = open.as_slice()?;
+    let highs = high.as_slice()?;
+    let lows = low.as_slice()?;
+    let closes = close.as_slice()?;
+    let n = opens.len();
+    super::common::validate_ohlc_length(n, highs.len(), lows.len(), closes.len())?;
+    let mut result = vec![0i32; n];
+    for i in 2..n {
+        let (o1, h1, l1, c1) = (opens[i - 2], highs[i - 2], lows[i - 2], closes[i - 2]);
+        let (o2, _h2, _l2, c2) = (opens[i - 1], highs[i - 1], lows[i - 1], closes[i - 1]);
+        let (o3, h3, l3, c3) = (opens[i], highs[i], lows[i], closes[i]);
+
+        let body1 = body_size(o1, c1);
+        let body2 = body_size(o2, c2);
+        let body3 = body_size(o3, c3);
+        let range1 = candle_range(h1, l1);
+        let range3 = candle_range(h3, l3);
+
+        // Evening star conditions:
+        // 1. First candle is a large bullish candle
+        // 2. Second candle is a star (small body) gapping above first
+        // 3. Third candle is a large bearish candle
+        let large_body1 = range1 > 0.0 && body1 >= range1 * 0.6;
+        let small_body2 = range1 > 0.0 && body2 < body1 * 0.3;
+        let large_body3 = range3 > 0.0 && body3 >= range3 * 0.6;
+
+        if is_bullish(o1, c1)
+            && large_body1
+            && small_body2
+            && is_bearish(o3, c3)
+            && large_body3
+            && c3 < (o1 + c1) / 2.0
+        {
+            result[i] = -100;
+        }
+    }
+    Ok(result.into_pyarray(py))
+}