126 lines
3.8 KiB
Rust
126 lines
3.8 KiB
Rust
use std::cell::RefCell;
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use std::os::raw::{c_int, c_void};
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use std::sync::{Arc, Mutex};
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use std::{fmt, mem, ptr};
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#[cfg(feature = "async")]
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use futures_core::future::LocalBoxFuture;
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use crate::error::Result;
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use crate::ffi;
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use crate::hook::Debug;
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use crate::lua::Lua;
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use crate::util::{assert_stack, StackGuard};
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use crate::value::MultiValue;
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/// Type of Lua integer numbers.
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pub type Integer = ffi::lua_Integer;
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/// Type of Lua floating point numbers.
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pub type Number = ffi::lua_Number;
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/// A "light" userdata value. Equivalent to an unmanaged raw pointer.
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#[derive(Debug, Copy, Clone, Eq, PartialEq)]
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pub struct LightUserData(pub *mut c_void);
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pub(crate) type Callback<'lua, 'a> =
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Box<dyn Fn(&'lua Lua, MultiValue<'lua>) -> Result<MultiValue<'lua>> + 'a>;
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#[cfg(feature = "async")]
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pub(crate) type AsyncCallback<'lua, 'a> =
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Box<dyn Fn(&'lua Lua, MultiValue<'lua>) -> LocalBoxFuture<'lua, Result<MultiValue<'lua>>> + 'a>;
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pub(crate) type HookCallback = Arc<RefCell<dyn FnMut(&Lua, Debug) -> Result<()>>>;
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#[cfg(feature = "send")]
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pub trait MaybeSend: Send {}
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#[cfg(feature = "send")]
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impl<T: Send> MaybeSend for T {}
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#[cfg(not(feature = "send"))]
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pub trait MaybeSend {}
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#[cfg(not(feature = "send"))]
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impl<T> MaybeSend for T {}
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/// An auto generated key into the Lua registry.
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///
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/// This is a handle to a value stored inside the Lua registry. It is not automatically
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/// garbage collected on Drop, but it can be removed with [`Lua::remove_registry_value`],
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/// and instances not manually removed can be garbage collected with [`Lua::expire_registry_values`].
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///
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/// Be warned, If you place this into Lua via a `UserData` type or a rust callback, it is *very
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/// easy* to accidentally cause reference cycles that the Lua garbage collector cannot resolve.
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/// Instead of placing a `RegistryKey` into a `UserData` type, prefer instead to use
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/// [`UserData::set_user_value`] / [`UserData::get_user_value`].
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///
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/// [`Lua::remove_registry_value`]: struct.Lua.html#method.remove_registry_value
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/// [`Lua::expire_registry_values`]: struct.Lua.html#method.expire_registry_values
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/// [`UserData::set_user_value`]: struct.UserData.html#method.set_user_value
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/// [`UserData::get_user_value`]: struct.UserData.html#method.get_user_value
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pub struct RegistryKey {
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pub(crate) registry_id: c_int,
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pub(crate) unref_list: Arc<Mutex<Option<Vec<c_int>>>>,
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}
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impl fmt::Debug for RegistryKey {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "RegistryKey({})", self.registry_id)
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}
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}
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impl Drop for RegistryKey {
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fn drop(&mut self) {
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let mut unref_list = mlua_expect!(self.unref_list.lock(), "unref list poisoned");
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if let Some(list) = unref_list.as_mut() {
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list.push(self.registry_id);
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}
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}
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}
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impl RegistryKey {
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// Destroys the RegistryKey without adding to the drop list
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pub(crate) fn take(self) -> c_int {
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let registry_id = self.registry_id;
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unsafe {
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ptr::read(&self.unref_list);
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mem::forget(self);
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}
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registry_id
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}
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}
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pub(crate) struct LuaRef<'lua> {
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pub(crate) lua: &'lua Lua,
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pub(crate) index: c_int,
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}
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impl<'lua> fmt::Debug for LuaRef<'lua> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "Ref({})", self.index)
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}
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}
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impl<'lua> Clone for LuaRef<'lua> {
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fn clone(&self) -> Self {
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self.lua.clone_ref(self)
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}
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}
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impl<'lua> Drop for LuaRef<'lua> {
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fn drop(&mut self) {
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self.lua.drop_ref(self)
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}
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}
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impl<'lua> PartialEq for LuaRef<'lua> {
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fn eq(&self, other: &Self) -> bool {
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let lua = self.lua;
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unsafe {
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let _sg = StackGuard::new(lua.state);
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assert_stack(lua.state, 2);
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lua.push_ref(&self);
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lua.push_ref(&other);
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ffi::lua_rawequal(lua.state, -1, -2) == 1
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}
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}
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}
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