Vendor dependencies for 0.3.0 release

vendor/gltf-json/src/extras.rs

@@ -0,0 +1,33 @@
+use gltf_derive::Validate;
+use serde_derive::{Deserialize, Serialize};
+use std::fmt;
+
+#[cfg(feature = "extras")]
+pub use serde_json::value::RawValue;
+
+/// Data type of the `extras` attribute on all glTF objects.
+#[cfg(feature = "extras")]
+pub type Extras = Option<::std::boxed::Box<RawValue>>;
+
+/// Data type of the `extras` attribute on all glTF objects.
+#[cfg(not(feature = "extras"))]
+pub type Extras = Void;
+
+/// Type representing no user-defined data.
+#[derive(Clone, Default, Serialize, Deserialize, Validate)]
+pub struct Void {
+    #[serde(default, skip_serializing)]
+    _allow_unknown_fields: (),
+}
+
+impl fmt::Debug for Void {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{{}}")
+    }
+}
+
+impl fmt::Display for Void {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{{}}")
+    }
+}