1 files changed, 63 insertions, 0 deletions
diff --git a/2.27.1/src/well_known_types.rs b/2.27.1/src/well_known_types.rs
new file mode 100644
index 0000000..6264947
--- /dev/null
+++ b/2.27.1/src/well_known_types.rs
@@ -0,0 +1,63 @@
+static NAMES: &'static [&'static str] = &[
+    "Any",
+    "Api",
+    "BoolValue",
+    "BytesValue",
+    "DoubleValue",
+    "Duration",
+    "Empty",
+    "Enum",
+    "EnumValue",
+    "Field",
+    // TODO: dotted names
+    "Field.Cardinality",
+    "Field.Kind",
+    "FieldMask",
+    "FloatValue",
+    "Int32Value",
+    "Int64Value",
+    "ListValue",
+    "Method",
+    "Mixin",
+    "NullValue",
+    "Option",
+    "SourceContext",
+    "StringValue",
+    "Struct",
+    "Syntax",
+    "Timestamp",
+    "Type",
+    "UInt32Value",
+    "UInt64Value",
+    "Value",
+];
+
+fn is_well_known_type(name: &str) -> bool {
+    NAMES.iter().any(|&n| n == name)
+}
+
+pub fn is_well_known_type_full(name: &str) -> Option<&str> {
+    if let Some(dot) = name.rfind('.') {
+        if &name[..dot] == ".google.protobuf" && is_well_known_type(&name[dot + 1..]) {
+            Some(&name[dot + 1..])
+        } else {
+            None
+        }
+    } else {
+        None
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn test_is_well_known_type_full() {
+        assert_eq!(
+            Some("BoolValue"),
+            is_well_known_type_full(".google.protobuf.BoolValue")
+        );
+        assert_eq!(None, is_well_known_type_full(".google.protobuf.Fgfg"));
+    }
+}