trying to organize files and use declarations

1 files changed, 41 insertions, 0 deletions

diff --git a/src/attributes/compass_point.rs b/src/attributes/compass_point.rs
new file mode 100644
index 0000000..3ebb250
--- /dev/null
+++ b/src/attributes/compass_point.rs
@@ -0,0 +1,41 @@
+use crate::dot::DotString;
+use std::borrow::Cow;
+
+// TODO: not sure we need this enum but should support setting nodeport either via
+// headport / tailport attributes e.g. a -> b [tailport=se]
+// or via edge declaration using the syntax node name:port_name e.g. a -> b:se
+// aka compass
+#[derive(Clone, PartialEq, Eq, Debug)]
+pub enum CompassPoint {
+    N,
+    NE,
+    E,
+    SE,
+    S,
+    SW,
+    W,
+    NW,
+    C,
+    // TODO: none might not be a good name
+    // The compass point "_" specifies that an appropriate side of the port adjacent to the exterior
+    // of the node should be used, if such exists. Otherwise, the center is used.
+    // If no compass point is used with a portname, the default value is "_".
+    None,
+}
+
+impl<'a> DotString<'a> for CompassPoint {
+    fn dot_string(&self) -> Cow<'a, str> {
+        match self {
+            CompassPoint::N => "n".into(),
+            CompassPoint::NE => "ne".into(),
+            CompassPoint::E => "e".into(),
+            CompassPoint::SE => "se".into(),
+            CompassPoint::S => "s".into(),
+            CompassPoint::SW => "sw".into(),
+            CompassPoint::W => "w".into(),
+            CompassPoint::NW => "nw".into(),
+            CompassPoint::C => "c".into(),
+            CompassPoint::None => "_".into(),
+        }
+    }
+}