From 22b6d218bdb6a5aafc0efd4fb80a67d2c796d0e7 Mon Sep 17 00:00:00 2001
From: SeanOMik <seanomik@gmail.com>
Date: Mon, 19 Feb 2024 23:12:02 -0500
Subject: [PATCH] Implement FromLuaVec for bool, add AnyUserdata::is for
 checking userdata type

---
 src/userdata/any.rs | 19 +++++++++++++++++++
 src/value.rs        | 29 ++++++++++++++++++++++++++++-
 2 files changed, 47 insertions(+), 1 deletion(-)

diff --git a/src/userdata/any.rs b/src/userdata/any.rs
index 52efeec..ce37102 100755
--- a/src/userdata/any.rs
+++ b/src/userdata/any.rs
@@ -90,6 +90,25 @@ impl<'a> AnyUserdata<'a> {
         }
     }
 
+    /// Returns a boolean indiciating if this Userdata is of type `T`.
+    pub fn is<T: Userdata + 'static>(&self) -> crate::Result<bool> {
+        unsafe {
+            let _g = StackGuard::new(self.state);
+            let s = self.state.state_ptr();
+
+            self.lref.push_to_lua_stack(self.state)?;
+            
+            if lua::lua_getmetatable(s, -1) == 0 {
+                return Err(crate::Error::MissingMetatable);
+            }
+
+            self.state.get_userdata_metatable::<T>()
+                .push_to_lua_stack(self.state)?;
+
+            Ok(lua::lua_rawequal(s, -2, -1) == 1)
+        }
+    }
+
     /// Returns the name of the userdata by accessing the metatable
     pub fn name(&self) -> crate::Result<String> {
         unsafe {
diff --git a/src/value.rs b/src/value.rs
index 0b87801..8d943ff 100755
--- a/src/value.rs
+++ b/src/value.rs
@@ -378,6 +378,18 @@ impl<'a> ValueVec<'a> {
             Ok(ValueVec(vec))
         }
     }
+
+    /// Returns none if there aren't enough values in self to fulfil T
+    pub fn try_into_vals<T: FromLuaVec<'a>>(self, lua: &'a State) -> crate::Result<Option<T>> {
+        if let Some(v) = T::value_num() {
+            if v > self.len() {
+                return Ok(None);
+            }
+        }
+
+        T::from_lua_value_vec(lua, self)
+            .map(|t| Some(t))
+    }
 }
 
 impl<'a> From<Value<'a>> for ValueVec<'a> {
@@ -481,6 +493,7 @@ impl_from_lua_vec_for_from_lua!(u32);
 impl_from_lua_vec_for_from_lua!(f64);
 impl_from_lua_vec_for_from_lua!(f32);
 impl_from_lua_vec_for_from_lua!(String);
+impl_from_lua_vec_for_from_lua!(bool);
 
 impl_from_lua_vec_for_from_lua!(Table, 'a);
 impl_from_lua_vec_for_from_lua!(Value, 'a);
@@ -630,7 +643,7 @@ macro_rules! impl_from_lua_vec_tuple {
                 if values.len() != 1 {
                     return Err(crate::Error::IncorrectArgCount {
                         arg_expected: 1,
-                        arg_count: $count,
+                        arg_count: values.len() as i32,
                     });
                 }
 
@@ -677,6 +690,20 @@ impl<'a, T: AsLua<'a>, const N: usize> AsLua<'a> for [T; N] {
     }
 }
 
+impl<'a, T: FromLua<'a>, const N: usize> FromLua<'a> for [T; N] {
+    fn from_lua(lua: &'a State, val: Value<'a>) -> crate::Result<Self> {
+        let tyname = val.type_name();
+
+        if let Some(table) = val.as_table() {
+            //table.get(key)
+        } else {
+            // Error::type_mismatch("array/table", &tyname)
+        }
+
+        todo!() // TODO
+    }
+}
+
 // TODO: Find out a way to implement this
 /* impl<'a, T: FromLua> FromLuaVec<'a> for T {
     fn from_lua_value_vec(state: &'a State, values: ValueVec<'a>) -> crate::Result<Self> {