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use ffi;
use libc;
use AsLua;
use AsMutLua;
use LuaContext;
use LuaRead;
use Push;
use PushGuard;
use std::marker::PhantomData;
use std::fmt::Debug;
use std::mem;
use std::ptr;
macro_rules! impl_function {
($name:ident, $($p:ident),*) => (
pub fn $name<Z, R $(, $p)*>(f: Z) -> Function<Z, ($($p,)*), R> where Z: FnMut($($p),*) -> R {
Function {
function: f,
marker: PhantomData,
}
}
)
}
impl_function!(function0,);
impl_function!(function1, A);
impl_function!(function2, A, B);
impl_function!(function3, A, B, C);
impl_function!(function4, A, B, C, D);
impl_function!(function5, A, B, C, D, E);
impl_function!(function6, A, B, C, D, E, F);
impl_function!(function7, A, B, C, D, E, F, G);
impl_function!(function8, A, B, C, D, E, F, G, H);
impl_function!(function9, A, B, C, D, E, F, G, H, I);
impl_function!(function10, A, B, C, D, E, F, G, H, I, J);
pub struct Function<F, P, R> {
function: F,
marker: PhantomData<(P, R)>,
}
pub trait FunctionExt<P> {
type Output;
fn call_mut(&mut self, params: P) -> Self::Output;
}
macro_rules! impl_function_ext {
() => (
impl<Z, R> FunctionExt<()> for Function<Z, (), R> where Z: FnMut() -> R {
type Output = R;
#[allow(non_snake_case)]
fn call_mut(&mut self, _: ()) -> Self::Output {
(self.function)()
}
}
impl<L, Z, R> Push<L> for Function<Z, (), R>
where L: AsMutLua,
Z: FnMut() -> R,
R: for<'a> Push<&'a mut InsideCallback> + 'static
{
fn push_to_lua(self, mut lua: L) -> PushGuard<L> {
unsafe {
let lua_data = ffi::lua_newuserdata(lua.as_mut_lua().0,
mem::size_of::<Z>() as libc::size_t);
let lua_data: *mut Z = mem::transmute(lua_data);
ptr::write(lua_data, self.function);
let wrapper: extern fn(*mut ffi::lua_State) -> libc::c_int = wrapper::<Self, _, R>;
ffi::lua_pushcclosure(lua.as_mut_lua().0, wrapper, 1);
PushGuard { lua: lua, size: 1 }
}
}
}
);
($($p:ident),+) => (
impl<Z, R $(,$p)*> FunctionExt<($($p,)*)> for Function<Z, ($($p,)*), R> where Z: FnMut($($p),*) -> R {
type Output = R;
#[allow(non_snake_case)]
fn call_mut(&mut self, params: ($($p,)*)) -> Self::Output {
let ($($p,)*) = params;
(self.function)($($p),*)
}
}
impl<L, Z, R $(,$p: 'static)+> Push<L> for Function<Z, ($($p,)*), R>
where L: AsMutLua,
Z: FnMut($($p),*) -> R,
($($p,)*): for<'p> LuaRead<&'p mut InsideCallback>,
R: for<'a> Push<&'a mut InsideCallback> + 'static
{
fn push_to_lua(self, mut lua: L) -> PushGuard<L> {
unsafe {
let lua_data = ffi::lua_newuserdata(lua.as_mut_lua().0,
mem::size_of::<Z>() as libc::size_t);
let lua_data: *mut Z = mem::transmute(lua_data);
ptr::write(lua_data, self.function);
let wrapper: extern fn(*mut ffi::lua_State) -> libc::c_int = wrapper::<Self, _, R>;
ffi::lua_pushcclosure(lua.as_mut_lua().0, wrapper, 1);
PushGuard { lua: lua, size: 1 }
}
}
}
)
}
impl_function_ext!();
impl_function_ext!(A);
impl_function_ext!(A, B);
impl_function_ext!(A, B, C);
impl_function_ext!(A, B, C, D);
impl_function_ext!(A, B, C, D, E);
impl_function_ext!(A, B, C, D, E, F);
impl_function_ext!(A, B, C, D, E, F, G);
impl_function_ext!(A, B, C, D, E, F, G, H);
impl_function_ext!(A, B, C, D, E, F, G, H, I);
impl_function_ext!(A, B, C, D, E, F, G, H, I, J);
pub struct InsideCallback {
lua: LuaContext,
}
unsafe impl<'a> AsLua for &'a InsideCallback {
fn as_lua(&self) -> LuaContext {
self.lua
}
}
unsafe impl<'a> AsLua for &'a mut InsideCallback {
fn as_lua(&self) -> LuaContext {
self.lua
}
}
unsafe impl<'a> AsMutLua for &'a mut InsideCallback {
fn as_mut_lua(&mut self) -> LuaContext {
self.lua
}
}
impl<'a, T, E> Push<&'a mut InsideCallback> for Result<T, E>
where T: Push<&'a mut InsideCallback> +
for<'b> Push<&'b mut &'a mut InsideCallback>,
E: Debug
{
fn push_to_lua(self, mut lua: &'a mut InsideCallback) -> PushGuard<&'a mut InsideCallback> {
match self {
Ok(val) => val.push_to_lua(lua),
Err(val) => {
let msg = format!("{:?}", val);
msg.push_to_lua(&mut lua).forget();
unsafe { ffi::lua_error(lua.as_mut_lua().0); }
unreachable!();
}
}
}
}
extern fn wrapper<T, P, R>(lua: *mut ffi::lua_State) -> libc::c_int
where T: FunctionExt<P, Output=R>,
P: for<'p> LuaRead<&'p mut InsideCallback> + 'static,
R: for<'p> Push<&'p mut InsideCallback>
{
let data_raw = unsafe { ffi::lua_touserdata(lua, ffi::lua_upvalueindex(1)) };
let data: &mut T = unsafe { mem::transmute(data_raw) };
let mut tmp_lua = InsideCallback { lua: LuaContext(lua) };
let arguments_count = unsafe { ffi::lua_gettop(lua) } as i32;
let args = match LuaRead::lua_read_at_position(&mut tmp_lua, -arguments_count as libc::c_int) {
Err(_) => {
let err_msg = format!("wrong parameter types for callback function");
err_msg.push_to_lua(&mut tmp_lua).forget();
unsafe { ffi::lua_error(lua); }
unreachable!()
},
Ok(a) => a
};
let ret_value = data.call_mut(args);
let nb = ret_value.push_to_lua(&mut tmp_lua).forget();
nb as libc::c_int
}