examples/lua-scripting/scripts/test.lua

@@ -77,11 +77,9 @@ end
 end ]]
 
 function on_update()
-    -- Although WorldTransform isn't used, I only want to
+    -- Get entities without WorldTransform
-    -- modify entities with that component.
+    local view = View.new(Transform, Not(Has(WorldTransform)), Res(DeltaTime))
-    local view = View.new(Transform, Has(WorldTransform), Res(DeltaTime))
     local res = world:view_query(view)
-
     ---@param transform Transform
     ---@param dt DeltaTime
     for entity, transform, dt in res:iter() do

lyra-scripting/scripts/lua/ecs.lua

@@ -24,4 +24,13 @@ end
 ---@return HasQuery
 function Has(val)
     return HasQuery.new(val)
+end
+
+---Create a `NotQuery` filter that will allow results if 
+---
+---@see NotQuery
+---@param val function|table|userdata
+---@return NotQuery
+function Not(val)
+    return NotQuery.new(val)
 end

lyra-scripting/src/lua/ecs/query/mod.rs

@@ -7,14 +7,20 @@ pub use changed::*;
 mod has;
 pub use has::*;
 
+mod not;
+pub use not::*;
+
 use lyra_ecs::Entity;
 
-use crate::{lua::{LuaComponent, FN_NAME_INTERNAL_ECS_QUERY_RESULT}, ScriptEntity, ScriptWorldPtr};
+use crate::{
+    lua::{LuaComponent, FN_NAME_INTERNAL_ECS_QUERY_RESULT},
+    ScriptEntity, ScriptWorldPtr,
+};
 
 #[derive(Clone)]
 enum QueryInner {
     Component(LuaComponent),
-    Function(mlua::Function)
+    Function(mlua::Function),
 }
 
 #[derive(Clone)]
@@ -30,18 +36,42 @@ impl LuaQuery {
     }
 
     /// Get the result of the query
-    /// 
+    ///
     /// > WARNING: ensure that the world pointer is not locked. If its locked when you call this,
     /// you WILL cause a deadlock.
-    pub fn get_query_result(&self, world: ScriptWorldPtr, entity: Entity) -> mlua::Result<mlua::Value> {
+    pub fn get_query_result(
+        &self,
+        world: ScriptWorldPtr,
+        entity: Entity,
+    ) -> mlua::Result<mlua::Value> {
         let lua_en = ScriptEntity(entity);
         match &self.0 {
-            QueryInner::Component(comp) => comp.call_method(FN_NAME_INTERNAL_ECS_QUERY_RESULT, (world, lua_en)),
+            QueryInner::Component(comp) => {
+                comp.call_method(FN_NAME_INTERNAL_ECS_QUERY_RESULT, (world, lua_en))
+            }
             QueryInner::Function(function) => function.call((world, lua_en)),
         }
     }
 }
 
+impl mlua::FromLua for LuaQuery {
+    fn from_lua(value: mlua::Value, lua: &mlua::Lua) -> mlua::Result<Self> {
+        let tyname = value.type_name();
+
+        if let Some(f) = value.as_function() {
+            Ok(Self(QueryInner::Function(f.clone())))
+        } else if let Ok(c) = LuaComponent::from_lua(value, lua) {
+            Ok(Self(QueryInner::Component(c)))
+        } else {
+            Err(mlua::Error::FromLuaConversionError {
+                from: tyname,
+                to: "Query".into(),
+                message: Some("expected query function, table, or user data".into()),
+            })
+        }
+    }
+}
+
 #[derive(Debug, Clone)]
 pub enum LuaQueryResult {
     None,
@@ -59,20 +89,20 @@ impl mlua::IntoLua for LuaQueryResult {
         match self {
             LuaQueryResult::None => {
                 t.set("result", "none")?;
-            },
+            }
             LuaQueryResult::AlwaysNone => {
                 t.set("result", "always_none")?;
-            },
+            }
             LuaQueryResult::FilterPass => {
                 t.set("result", "filter_pass")?;
-            },
+            }
             LuaQueryResult::FilterDeny => {
                 t.set("result", "filter_deny")?;
-            },
+            }
             LuaQueryResult::Some(value) => {
                 t.set("result", "some")?;
                 t.set("val", value)?;
-            },
+            }
         }
 
         t.into_lua(lua)
@@ -93,17 +123,22 @@ fn malformed_table_error_query_result(ty: &'static str, missing_field: &str) ->
     mlua::Error::FromLuaConversionError {
         from: ty,
         to: "QueryResult".into(),
-        message: Some(format!("malformed table, cannot convert, failed to get field '{}'", missing_field)),
+        message: Some(format!(
+            "malformed table, cannot convert, failed to get field '{}'",
+            missing_field
+        )),
     }
 }
 
 impl mlua::FromLua for LuaQueryResult {
     fn from_lua(value: mlua::Value, _: &mlua::Lua) -> mlua::Result<Self> {
         let ty = value.type_name();
-        let table = value.as_table()
+        let table = value
+            .as_table()
             .ok_or(from_lua_error_query_result(ty, "expected Table"))?;
 
-        let var_name: String = table.get("enum_ty")
+        let var_name: String = table
+            .get("enum_ty")
             .map_err(|_| malformed_table_error_query_result(ty, "enum_ty"))?;
         if var_name != "query_result" {
             return Err(mlua::Error::FromLuaConversionError {
@@ -113,7 +148,8 @@ impl mlua::FromLua for LuaQueryResult {
             });
         }
 
-        let result: String = table.get("result")
+        let result: String = table
+            .get("result")
             .map_err(|_| malformed_table_error_query_result(ty, "result"))?;
         let result_str = result.as_str();
 
@@ -123,17 +159,16 @@ impl mlua::FromLua for LuaQueryResult {
             "filter_pass" => Ok(Self::FilterPass),
             "filter_deny" => Ok(Self::FilterDeny),
             "value" => {
-                let val: mlua::Value = table.get("val")
+                let val: mlua::Value = table
+                    .get("val")
                     .map_err(|_| malformed_table_error_query_result(ty, "val"))?;
                 Ok(Self::Some(val))
-            },
-            _ => {
-                Err(mlua::Error::FromLuaConversionError {
-                    from: ty,
-                    to: "QueryResult".into(),
-                    message: Some(format!("unknown result type: '{}'", result_str)),
-                })
             }
+            _ => Err(mlua::Error::FromLuaConversionError {
+                from: ty,
+                to: "QueryResult".into(),
+                message: Some(format!("unknown result type: '{}'", result_str)),
+            }),
         }
     }
-}
+}

lyra-scripting/src/lua/ecs/query/not.rs

@@ -0,0 +1,47 @@
+use crate::{
+    lua::FN_NAME_INTERNAL_ECS_QUERY_RESULT,
+    ScriptEntity, ScriptWorldPtr,
+};
+
+use super::LuaQuery;
+
+#[derive(Clone)]
+pub struct LuaNotQuery(LuaQuery);
+
+impl mlua::FromLua for LuaNotQuery {
+    fn from_lua(value: mlua::Value, _: &mlua::Lua) -> mlua::Result<Self> {
+        let tyname = value.type_name();
+        value
+            .as_userdata()
+            .ok_or(mlua::Error::FromLuaConversionError {
+                from: tyname,
+                to: "NotQuery".into(),
+                message: None,
+            })
+            .and_then(|ud| ud.borrow::<Self>())
+            .map(|ud| ud.clone())
+    }
+}
+
+impl mlua::UserData for LuaNotQuery {
+    fn add_methods<M: mlua::UserDataMethods<Self>>(methods: &mut M) {
+        methods.add_function("new", |_, q: LuaQuery| {
+            Ok(Self(q))
+        });
+
+        methods.add_method(
+            FN_NAME_INTERNAL_ECS_QUERY_RESULT,
+            |_, this, (world, en): (ScriptWorldPtr, ScriptEntity)| {
+                let res = this.0.get_query_result(world, en.0)?;
+
+                if let Some(res_bool) = res.as_boolean() {
+                    Ok(!res_bool)
+                } else if res.is_nil() {
+                    Ok(true)
+                } else {
+                    Ok(false)
+                }
+            },
+        );
+    }
+}

lyra-scripting/src/lua/providers/ecs.rs

@@ -1,7 +1,7 @@
 use lyra_ecs::ResourceObject;
 use lyra_reflect::Reflect;
 
-use crate::{lua::{ecs::{query::{LuaChangedQuery, LuaHasQuery, LuaResQuery}, View}, wrappers::*, LuaContext, LuaWrapper, RegisterLuaType, FN_NAME_INTERNAL_REFLECT, FN_NAME_INTERNAL_REFLECT_TYPE}, ScriptApiProvider, ScriptBorrow, ScriptData, ScriptDynamicBundle, ScriptWorldPtr};
+use crate::{lua::{ecs::{query::{LuaChangedQuery, LuaHasQuery, LuaNotQuery, LuaResQuery}, View}, wrappers::*, LuaContext, LuaWrapper, RegisterLuaType, FN_NAME_INTERNAL_REFLECT, FN_NAME_INTERNAL_REFLECT_TYPE}, ScriptApiProvider, ScriptBorrow, ScriptData, ScriptDynamicBundle, ScriptWorldPtr};
 
 //fn register_lua_proxy::<T: 
 
@@ -48,6 +48,7 @@ impl ScriptApiProvider for LyraEcsApiProvider {
         globals.set("ResQuery", ctx.create_proxy::<LuaResQuery>()?)?;
         globals.set("ChangedQuery", ctx.create_proxy::<LuaChangedQuery>()?)?;
         globals.set("HasQuery", ctx.create_proxy::<LuaHasQuery>()?)?;
+        globals.set("NotQuery", ctx.create_proxy::<LuaNotQuery>()?)?;
 
         expose_comp_table_wrapper::<LuaCamera>(&ctx, &globals, "Camera")?;
         expose_comp_table_wrapper::<LuaFreeFlyCamera>(&ctx, &globals, "FreeFlyCamera")?;