1 files changed, 25 insertions, 0 deletions
diff --git a/third_party/rust/fluent-syntax/src/ast/helper.rs b/third_party/rust/fluent-syntax/src/ast/helper.rs
new file mode 100644
index 0000000000..923437d23b
--- /dev/null
+++ b/third_party/rust/fluent-syntax/src/ast/helper.rs
@@ -0,0 +1,25 @@
+#[cfg(feature = "serde")]
+use serde::{Deserialize, Serialize};
+
+use super::Comment;
+// This is a helper struct used to properly deserialize referential
+// JSON comments which are single continous String, into a vec of
+// content slices.
+#[derive(Debug, PartialEq, Clone)]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
+#[cfg_attr(feature = "serde", serde(untagged))]
+pub enum CommentDef<S> {
+    Single { content: S },
+    Multi { content: Vec<S> },
+}
+
+impl<'s, S> From<CommentDef<S>> for Comment<S> {
+    fn from(input: CommentDef<S>) -> Self {
+        match input {
+            CommentDef::Single { content } => Self {
+                content: vec![content],
+            },
+            CommentDef::Multi { content } => Self { content },
+        }
+    }
+}