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authorVincent Ambo <mail@tazj.in>2022-08-11T08·50+0300
committertazjin <tazjin@tvl.su>2022-08-25T12·07+0000
commit75a22321ce55512d5f436168a2f913cf9f8f8ee3 (patch)
treea8d262bfa633226c99435e8aeba0bffdd259247b /tvix/eval/src/value
parent4eafaae9e66c66a7765ff3854890039d7536a9b9 (diff)
feat(tvix/eval): implement list concatenation r/4479
Change-Id: Icdf715d116371a9f139bdf95266410bf967bef25
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6144
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
Diffstat (limited to 'tvix/eval/src/value')
-rw-r--r--tvix/eval/src/value/list.rs9
-rw-r--r--tvix/eval/src/value/mod.rs10
2 files changed, 19 insertions, 0 deletions
diff --git a/tvix/eval/src/value/list.rs b/tvix/eval/src/value/list.rs
index d5f7c8b2ba44..f9d85229410a 100644
--- a/tvix/eval/src/value/list.rs
+++ b/tvix/eval/src/value/list.rs
@@ -18,3 +18,12 @@ impl Display for NixList {
         f.write_str("]")
     }
 }
+
+impl NixList {
+    pub fn concat(&self, other: &Self) -> Self {
+        let mut lhs = self.clone();
+        let mut rhs = other.clone();
+        lhs.0.append(&mut rhs.0);
+        lhs
+    }
+}
diff --git a/tvix/eval/src/value/mod.rs b/tvix/eval/src/value/mod.rs
index 2a89f1c35890..0c9042dbfe25 100644
--- a/tvix/eval/src/value/mod.rs
+++ b/tvix/eval/src/value/mod.rs
@@ -81,6 +81,16 @@ impl Value {
             }),
         }
     }
+
+    pub fn as_list(self) -> EvalResult<NixList> {
+        match self {
+            Value::List(l) => Ok(l),
+            other => Err(Error::TypeError {
+                expected: "list",
+                actual: other.type_of(),
+            }),
+        }
+    }
 }
 
 impl Display for Value {