Enchantments (#286)

* start implementing enchants

* store parsed registries

* more work on enchants

* implement deserializer for some entity effects

* mostly working definitions for enchants

* fix tests

* detect equipment changes

* fix errors

* update changelog

* fix some imports

* remove outdated todo

* add basic test for enchants applying attributes

* use git simdnbt

1 files changed, 33 insertions, 0 deletions

diff --git a/azalea-core/src/attribute_modifier_operation.rs b/azalea-core/src/attribute_modifier_operation.rs
new file mode 100644
index 00000000..ff92a44a
--- /dev/null
+++ b/azalea-core/src/attribute_modifier_operation.rs
@@ -0,0 +1,33 @@
+use std::str::FromStr;
+
+use azalea_buf::AzBuf;
+use serde::Serialize;
+use simdnbt::{FromNbtTag, borrow::NbtTag};
+
+#[derive(Clone, Copy, PartialEq, AzBuf, Debug, Serialize)]
+#[serde(rename_all = "snake_case")]
+pub enum AttributeModifierOperation {
+    AddValue,
+    AddMultipliedBase,
+    AddMultipliedTotal,
+}
+
+impl FromStr for AttributeModifierOperation {
+    type Err = ();
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let value: AttributeModifierOperation = match s {
+            "add_value" => Self::AddValue,
+            "add_multiplied_base" => Self::AddMultipliedBase,
+            "add_multiplied_total" => Self::AddMultipliedTotal,
+            _ => return Err(()),
+        };
+        Ok(value)
+    }
+}
+impl FromNbtTag for AttributeModifierOperation {
+    fn from_nbt_tag(tag: NbtTag) -> Option<Self> {
+        let v = tag.string()?;
+        Self::from_str(&v.to_str()).ok()
+    }
+}