piercing

ta_lib/patterns/src/lib.rs

@@ -10,6 +10,7 @@ pub mod h;
 pub mod hexad;
 pub mod marubozu;
 pub mod on_neck;
+pub mod piercing;
 pub mod shrinking;
 pub mod slingshot;
 pub mod split;

ta_lib/patterns/src/piercing.rs

@@ -0,0 +1,52 @@
+use core::series::Series;
+
+pub fn bullish(open: &[f64], close: &[f64]) -> Vec<bool> {
+    let open = Series::from(open);
+    let close = Series::from(close);
+
+    (close.gt(&open)
+        & close.shift(1).lt(&open.shift(1))
+        & open.lt(&close.shift(1))
+        & close.lt(&open.shift(1))
+        & close.gte(&((close.shift(1) + open.shift(1)) / 2.0)))
+    .into()
+}
+
+pub fn bearish(open: &[f64], close: &[f64]) -> Vec<bool> {
+    let open = Series::from(open);
+    let close = Series::from(close);
+
+    (close.lt(&open)
+        & close.shift(1).gt(&open.shift(1))
+        & open.gt(&close.shift(1))
+        & close.gt(&open.shift(1))
+        & close.lte(&((close.shift(1) + open.shift(1)) / 2.0)))
+    .into()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_piercing_bullish() {
+        let open = vec![4.0, 4.0, 4.0, 4.0, 4.0];
+        let close = vec![2.0, 2.5, 2.0, 1.5, 2.0];
+        let expected = vec![false, false, false, false, false];
+
+        let result = bullish(&open, &close);
+
+        assert_eq!(result, expected);
+    }
+
+    #[test]
+    fn test_piercing_bearish() {
+        let open = vec![4.0, 4.0, 4.0, 4.0, 4.0];
+        let close = vec![2.0, 2.5, 2.0, 1.5, 2.0];
+        let expected = vec![false, false, false, false, false];
+
+        let result = bearish(&open, &close);
+
+        assert_eq!(result, expected);
+    }
+}