1 files changed, 22 insertions, 0 deletions
diff --git a/src/attributes/rankdir.rs b/src/attributes/rankdir.rs
new file mode 100644
index 0000000..58fdeff
--- /dev/null
+++ b/src/attributes/rankdir.rs
@@ -0,0 +1,22 @@
+use crate::dot::DotString;
+use std::borrow::Cow;
+
+/// Corresponding to directed graphs drawn from top to bottom, from left to right,
+/// from bottom to top, and from right to left, respectively.
+pub enum RankDir {
+    TopBottom,
+    LeftRight,
+    BottomTop,
+    RightLeft,
+}
+
+impl<'a> DotString<'a> for RankDir {
+    fn dot_string(&self) -> Cow<'a, str> {
+        match self {
+            RankDir::TopBottom => "TB".into(),
+            RankDir::LeftRight => "LR".into(),
+            RankDir::BottomTop => "BT".into(),
+            RankDir::RightLeft => "RL".into(),
+        }
+    }
+}