From e472b0347f84f39edf4655d39f8b5484870d0a76 Mon Sep 17 00:00:00 2001
From: Alex Saveau <saveau.alexandre@gmail.com>
Date: Thu, 11 May 2023 05:56:17 -0700
Subject: Alternate between right/left alignment in equations (#936)

---
 src/geom/align.rs | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'src')

diff --git a/src/geom/align.rs b/src/geom/align.rs
index 239a6e70..69f32bee 100644
--- a/src/geom/align.rs
+++ b/src/geom/align.rs
@@ -183,3 +183,22 @@ impl Fold for GenAlign {
         self
     }
 }
+
+#[derive(Copy, Clone, Eq, PartialEq, Debug)]
+pub enum LeftRightAlternator {
+    Left,
+    Right,
+}
+
+impl Iterator for LeftRightAlternator {
+    type Item = LeftRightAlternator;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let r = Some(*self);
+        match self {
+            Self::Left => *self = Self::Right,
+            Self::Right => *self = Self::Left,
+        }
+        r
+    }
+}
-- 
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