1 files changed, 14 insertions, 0 deletions
diff --git a/dhall/src/grammar_util.rs b/dhall/src/grammar_util.rs
new file mode 100644
index 0000000..c546a13
--- /dev/null
+++ b/dhall/src/grammar_util.rs
@@ -0,0 +1,14 @@
+use crate::core::{Expr, X};
+use crate::lexer::Builtin;
+
+pub type ParsedExpr<'i> = Expr<'i, X, X>; // FIXME Parse paths and replace the second X with Path
+pub type BoxExpr<'i> = Box<ParsedExpr<'i>>;
+pub type ExprOpFn<'i> = fn(BoxExpr<'i>, BoxExpr<'i>) -> ParsedExpr<'i>;
+pub type ExprListFn<'i> = fn(BoxExpr<'i>, Vec<ParsedExpr<'i>>) -> ParsedExpr<'i>;
+
+pub fn builtin_expr<'i, S, A>(b: Builtin) -> Expr<'i, S, A> {
+    match b {
+        Builtin::Type(t)  => Expr::BuiltinType(t),
+        Builtin::Value(v) => Expr::BuiltinValue(v),
+    }
+}