oops

1 files changed, 38 insertions, 0 deletions

diff --git a/dhall_core/src/label.rs b/dhall_core/src/label.rs
new file mode 100644
index 0000000..3633b93
--- /dev/null
+++ b/dhall_core/src/label.rs
@@ -0,0 +1,38 @@
+use std::fmt::{self, Display};
+use std::rc::Rc;
+
+// The type for labels throughout the AST
+// It owns the data because otherwise lifetimes would make recursive imports impossible
+#[derive(Debug, Clone, PartialEq, Eq, Hash, PartialOrd, Ord)]
+pub struct Label(Rc<str>);
+
+impl From<String> for Label {
+    fn from(s: String) -> Self {
+        let s: &str = &s;
+        Label(s.into())
+    }
+}
+
+impl<'a> From<&'a str> for Label {
+    fn from(s: &'a str) -> Self {
+        Label(Rc::from(s))
+    }
+}
+
+impl From<Label> for String {
+    fn from(x: Label) -> String {
+        x.0.as_ref().to_owned()
+    }
+}
+
+impl Display for Label {
+    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+        self.0.as_ref().fmt(f)
+    }
+}
+
+impl Label {
+    pub fn from_str(s: &str) -> Label {
+        Label(s.into())
+    }
+}