Move Rojo server into root of the repository

src/snapshot/patch.rs

@@ -0,0 +1,44 @@
+//! Defines the data structures used for describing instance patches.
+
+use std::collections::HashMap;
+
+use rbx_dom_weak::{RbxId, RbxValue};
+
+use super::InstanceSnapshot;
+
+/// A set of different kinds of patches that can be applied to an RbxTree.
+#[derive(Debug, Default, Clone, PartialEq)]
+pub struct PatchSet<'a> {
+    pub removed_instances: Vec<RbxId>,
+    pub added_instances: Vec<PatchAddInstance<'a>>,
+    pub updated_instances: Vec<PatchUpdateInstance>,
+}
+
+impl<'a> PatchSet<'a> {
+    pub fn new() -> PatchSet<'a> {
+        PatchSet {
+            removed_instances: Vec::new(),
+            added_instances: Vec::new(),
+            updated_instances: Vec::new(),
+        }
+    }
+}
+
+/// A patch containing an instance that was added to the tree.
+#[derive(Debug, Clone, PartialEq)]
+pub struct PatchAddInstance<'a> {
+    pub parent_id: RbxId,
+    pub instance: InstanceSnapshot<'a>,
+}
+
+/// A patch indicating that properties (or the name) of an instance changed.
+#[derive(Debug, Clone, PartialEq)]
+pub struct PatchUpdateInstance {
+    pub id: RbxId,
+    pub changed_name: Option<String>,
+    pub changed_class_name: Option<String>,
+
+    /// Contains all changed properties. If a property is assigned to `None`,
+    /// then that property has been removed.
+    pub changed_properties: HashMap<String, Option<RbxValue>>,
+}