From 0141e8e8c7f3e295d57990fdce6019e2d777aed0 Mon Sep 17 00:00:00 2001
From: Greg Brown <gmb60@cam.ac.uk>
Date: Wed, 18 Nov 2020 13:31:27 +0000
Subject: Convert concrete to abstract syntax tree

---
 src/ast/mod.rs | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 src/ast/mod.rs

(limited to 'src/ast/mod.rs')

diff --git a/src/ast/mod.rs b/src/ast/mod.rs
new file mode 100644
index 0000000..1fa7d23
--- /dev/null
+++ b/src/ast/mod.rs
@@ -0,0 +1,15 @@
+pub mod convert;
+
+type Ident = String;
+
+#[derive(Clone, Debug, Eq, PartialEq)]
+pub enum Term {
+    Epsilon,
+    Bottom,
+    Literal(String),
+    Cat(Box<Term>, Box<Term>),
+    Alt(Box<Term>, Box<Term>),
+    Fix(Box<Term>), // Uses de Bruijn indices
+    Variable(usize),
+    Call(Ident, Vec<Term>),
+}
-- 
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