109 lines
3.2 KiB
Rust
109 lines
3.2 KiB
Rust
use error::*;
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use lua::*;
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#[derive(Debug, Default, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
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pub struct LNil;
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#[derive(Debug, Default, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
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pub struct LCons<H, T>(pub H, pub T);
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impl<'lua> ToLuaMulti<'lua> for () {
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fn to_lua_multi(self, _: &'lua Lua) -> LuaResult<LuaMultiValue> {
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Ok(LuaMultiValue::new())
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}
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}
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impl<'lua> FromLuaMulti<'lua> for () {
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fn from_lua_multi(_: LuaMultiValue, _: &'lua Lua) -> LuaResult<Self> {
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Ok(())
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}
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}
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impl<'lua, T: ToLua<'lua>> ToLuaMulti<'lua> for T {
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fn to_lua_multi(self, lua: &'lua Lua) -> LuaResult<LuaMultiValue<'lua>> {
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let mut v = LuaMultiValue::new();
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v.push_back(self.to_lua(lua)?);
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Ok(v)
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}
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}
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impl<'lua, T: FromLua<'lua>> FromLuaMulti<'lua> for T {
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fn from_lua_multi(mut values: LuaMultiValue<'lua>, lua: &'lua Lua) -> LuaResult<Self> {
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Ok(T::from_lua(values.pop_front().unwrap_or(LuaNil), lua)?)
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}
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}
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impl<'lua> ToLuaMulti<'lua> for LuaMultiValue<'lua> {
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fn to_lua_multi(self, _: &'lua Lua) -> LuaResult<LuaMultiValue<'lua>> {
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Ok(self)
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}
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}
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impl<'lua> FromLuaMulti<'lua> for LuaMultiValue<'lua> {
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fn from_lua_multi(values: LuaMultiValue<'lua>, _: &'lua Lua) -> LuaResult<Self> {
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Ok(values)
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}
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}
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pub struct LuaVariadic<T>(pub Vec<T>);
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impl<'lua, T: ToLua<'lua>> ToLuaMulti<'lua> for LuaVariadic<T> {
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fn to_lua_multi(self, lua: &'lua Lua) -> LuaResult<LuaMultiValue<'lua>> {
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self.0.into_iter().map(|e| e.to_lua(lua)).collect()
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}
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}
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impl<'lua, T: FromLua<'lua>> FromLuaMulti<'lua> for LuaVariadic<T> {
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fn from_lua_multi(values: LuaMultiValue<'lua>, lua: &'lua Lua) -> LuaResult<Self> {
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values
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.into_iter()
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.map(|e| T::from_lua(e, lua))
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.collect::<LuaResult<Vec<T>>>()
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.map(LuaVariadic)
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}
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}
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impl<'lua> ToLuaMulti<'lua> for LNil {
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fn to_lua_multi(self, _: &'lua Lua) -> LuaResult<LuaMultiValue<'lua>> {
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Ok(LuaMultiValue::new())
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}
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}
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impl<'lua> FromLuaMulti<'lua> for LNil {
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fn from_lua_multi(_: LuaMultiValue<'lua>, _: &'lua Lua) -> LuaResult<Self> {
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Ok(LNil)
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}
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}
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impl<'lua, T: ToLuaMulti<'lua>> ToLuaMulti<'lua> for LCons<T, LNil> {
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fn to_lua_multi(self, lua: &'lua Lua) -> LuaResult<LuaMultiValue<'lua>> {
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self.0.to_lua_multi(lua)
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}
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}
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impl<'lua, T: FromLuaMulti<'lua>> FromLuaMulti<'lua> for LCons<T, LNil> {
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fn from_lua_multi(values: LuaMultiValue<'lua>, lua: &'lua Lua) -> LuaResult<Self> {
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Ok(LCons(T::from_lua_multi(values, lua)?, LNil))
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}
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}
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impl<'lua, H: ToLua<'lua>, A, B> ToLuaMulti<'lua> for LCons<H, LCons<A, B>>
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where LCons<A, B>: ToLuaMulti<'lua>
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{
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fn to_lua_multi(self, lua: &'lua Lua) -> LuaResult<LuaMultiValue<'lua>> {
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let mut results = self.1.to_lua_multi(lua)?;
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results.push_front(self.0.to_lua(lua)?);
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Ok(results)
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}
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}
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impl<'lua, H: FromLua<'lua>, A, B> FromLuaMulti<'lua> for LCons<H, LCons<A, B>>
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where LCons<A, B>: FromLuaMulti<'lua>
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{
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fn from_lua_multi(mut values: LuaMultiValue<'lua>, lua: &'lua Lua) -> LuaResult<Self> {
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let val = H::from_lua(values.pop_front().unwrap_or(LuaNil), lua)?;
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let res = LCons::<A, B>::from_lua_multi(values, lua)?;
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Ok(LCons(val, res))
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}
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}
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