Parse builtins correctly

1 files changed, 26 insertions, 0 deletions

diff --git a/src/grammar_util.rs b/src/grammar_util.rs
index cbd1e59..d73be94 100644
--- a/src/grammar_util.rs
+++ b/src/grammar_util.rs
@@ -1,4 +1,5 @@
 use core::Expr;
+use lexer::Builtin;
 
 pub type BoxExpr = Box<Expr<(), ()>>;
 pub type ExprOpFn = fn(BoxExpr, BoxExpr) -> Expr<(), ()>;
@@ -6,3 +7,28 @@ pub type ExprOpFn = fn(BoxExpr, BoxExpr) -> Expr<(), ()>;
 pub fn bx<T>(x: T) -> Box<T> {
     Box::new(x)
 }
+
+pub fn builtin_expr<S, A>(b: Builtin) -> Expr<S, A> {
+    match b {
+        Builtin::Natural => Expr::Natural,
+        Builtin::NaturalFold => Expr::NaturalFold,
+        Builtin::NaturalBuild => Expr::NaturalBuild,
+        Builtin::NaturalIsZero => Expr::NaturalIsZero,
+        Builtin::NaturalEven => Expr::NaturalEven,
+        Builtin::NaturalOdd => Expr::NaturalOdd,
+        Builtin::Integer => Expr::Integer,
+        Builtin::Double => Expr::Double,
+        Builtin::Text => Expr::Text,
+        Builtin::List => Expr::List,
+        Builtin::ListBuild => Expr::ListBuild,
+        Builtin::ListFold => Expr::ListFold,
+        Builtin::ListLength => Expr::ListLength,
+        Builtin::ListHead => Expr::ListHead,
+        Builtin::ListLast => Expr::ListLast,
+        Builtin::ListIndexed => Expr::ListIndexed,
+        Builtin::ListReverse => Expr::ListReverse,
+        Builtin::Optional => Expr::Optional,
+        Builtin::OptionalFold => Expr::OptionalFold,
+        Builtin::Bool => Expr::Bool,
+    }
+}