scripting: support 'overloaded' like methods in wrapper macro
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@ -1,6 +1,6 @@
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use proc_macro2::{Ident, Span};
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use quote::quote;
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use syn::{parse_macro_input, Path, Token, token, parenthesized, punctuated::Punctuated, braced, bracketed};
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use syn::{parse_macro_input, Path, Token, token, parenthesized, punctuated::Punctuated, braced};
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mod mat_wrapper;
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use mat_wrapper::MatWrapper;
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@ -31,6 +31,221 @@ impl syn::parse::Parse for MetaMethod {
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}
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}
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impl MetaMethod {
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/// Returns a boolean if an identifier is a lua wrapper, and therefore also userdata
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fn is_arg_wrapper(ident: &Ident) -> bool {
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let s = ident.to_string();
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s.starts_with("Lua")
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}
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/// returns the tokens of the body of the metamethod
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///
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/// Parameters
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/// * `metamethod` - The ident of the metamethod that is being implemented.
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/// * `other` - The tokens of the argument used in the metamethod.
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fn get_method_body(metamethod: &Ident, other: proc_macro2::TokenStream) -> proc_macro2::TokenStream {
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let mm_str = metamethod.to_string();
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let mm_str = mm_str.as_str();
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match mm_str {
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"Add" | "Sub" | "Div" | "Mul" | "Mod" => {
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let symbol = match mm_str {
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"Add" => quote!(+),
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"Sub" => quote!(-),
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"Div" => quote!(/),
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"Mul" => quote!(*),
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"Mod" => quote!(%),
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_ => unreachable!(), // the string was just checked to be one of these
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};
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quote! {
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Ok(Self(this.0 #symbol #other))
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}
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},
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"Unm" => {
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quote! {
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Ok(Self(-this.0))
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}
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},
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"Eq" => {
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quote! {
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Ok(this.0 == #other)
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}
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},
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"Shl" => {
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quote! {
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Ok(Self(this.0 << #other))
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}
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}
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"Shr" => {
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quote! {
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Ok(Self(this.0 >> #other))
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}
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},
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"BAnd" | "BOr" | "BXor" => {
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let symbol = match mm_str {
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"BAnd" => {
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quote!(&)
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},
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"BOr" => {
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quote!(|)
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},
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"BXor" => {
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quote!(^)
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},
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_ => unreachable!() // the string was just checked to be one of these
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};
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quote! {
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Ok(Self(this.0 #symbol #other))
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}
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},
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"BNot" => {
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quote! {
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Ok(Self(!this.0))
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}
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},
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"ToString" => {
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quote! {
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Ok(format!("{:?}", this.0))
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}
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},
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_ => syn::Error::new_spanned(metamethod,
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"unsupported auto implementation of metamethod").to_compile_error(),
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}
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}
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fn get_body_for_arg(mt_ident: &Ident, arg_ident: &Ident, arg_param: proc_macro2::TokenStream) -> proc_macro2::TokenStream {
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let other: proc_macro2::TokenStream = if Self::is_arg_wrapper(arg_ident) {
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// Lua wrappers must be dereferenced
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quote! {
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#arg_param.0
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}
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} else {
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quote! {
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#arg_param
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}
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};
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Self::get_method_body(&mt_ident, other)
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}
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pub fn to_tokens(&self, wrapper_ident: &Ident) -> proc_macro2::TokenStream {
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let wrapped_str = &wrapper_ident.to_string()[3..]; // removes starting 'Lua' from name
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let mt_ident = &self.ident;
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let mt_lua_name = mt_ident.to_string().to_lowercase();
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if self.mods.is_empty() {
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let other = quote! {
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v.0
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};
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let body = Self::get_method_body(&self.ident, other);
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quote! {
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methods.add_meta_method(mlua::MetaMethod::#mt_ident, |_, this, (v,): (#wrapper_ident,)| {
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#body
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});
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}
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} else if self.mods.len() == 1 {
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let first = self.mods.iter().next().unwrap();
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let body = Self::get_body_for_arg(&self.ident, first, quote!(v));
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quote! {
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methods.add_meta_method(mlua::MetaMethod::#mt_ident, |_, this, (v,): (#first,)| {
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#body
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});
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}
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} else {
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// an optional match arm that matches mlua::Value:Number
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let number_arm = {
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let num_ident = self.mods.iter().find(|i| {
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let is = i.to_string();
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let is = is.as_str();
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match is {
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"u8" | "u16" | "u32" | "u64" | "u128"
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| "i8" | "i16" | "i32" | "i64" | "i128"
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| "f32" | "f64" => true,
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_ => false,
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}
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});
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if let Some(num_ident) = num_ident {
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let body = Self::get_body_for_arg(&self.ident, num_ident, quote!(n as #num_ident));
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quote! {
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mlua::Value::Number(n) => {
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#body
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},
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}
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} else { quote!() }
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};
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let userdata_arm = {
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let wrappers: Vec<&Ident> = self.mods.iter()
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.filter(|i| Self::is_arg_wrapper(i))
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.collect();
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let if_statements = wrappers.iter().map(|i| {
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let body = Self::get_method_body(&self.ident, quote!(other.0));
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quote! {
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if let Ok(other) = ud.borrow::<#i>() {
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#body
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}
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}
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});
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quote! {
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mlua::Value::UserData(ud) => {
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#(#if_statements else)*
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// this is the body of the else statement
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{
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// try to get the name of the userdata for the error message
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if let Ok(mt) = ud.get_metatable() {
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if let Ok(name) = mt.get::<String>("__name") {
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return Err(mlua::Error::BadArgument {
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to: Some(format!("{}.__{}", #wrapped_str, #mt_lua_name)),
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pos: 2,
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name: Some("rhs".to_string()),
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cause: Arc::new(mlua::Error::RuntimeError(
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format!("cannot multiply with unknown userdata named {}", name)
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))
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});
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}
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}
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Err(mlua::Error::BadArgument {
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to: Some(format!("{}.__{}", #wrapped_str, #mt_lua_name)),
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pos: 2,
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name: Some("rhs".to_string()),
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cause: Arc::new(
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mlua::Error::runtime("cannot multiply with unknown userdata")
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)
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})
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}
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},
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}
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};
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quote! {
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methods.add_meta_method(mlua::MetaMethod::#mt_ident, |_, this, (v,): (mlua::Value,)| {
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match v {
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#number_arm
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#userdata_arm
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_ => Err(mlua::Error::BadArgument {
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to: Some(format!("{}.__{}", #wrapped_str, #mt_lua_name)),
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pos: 2,
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name: Some("rhs".to_string()),
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cause: Arc::new(
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mlua::Error::RuntimeError(format!("cannot multiply with {}", v.type_name()))
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)
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})
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}
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});
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}
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}
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}
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}
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pub(crate) struct VecWrapper {
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}
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@ -341,6 +556,7 @@ pub fn wrap_math_vec_copy(input: proc_macro::TokenStream) -> proc_macro::TokenSt
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None
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}
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};
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// TODO: fix this so it doesn't cause a stack overflow
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/* let vec_wrapper_fields = vec_wrapper.as_ref().map(|vec|
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vec.to_field_tokens(&path, &wrapper_typename)); */
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let vec_wrapper_fields: Option<proc_macro2::TokenStream> = None;
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@ -389,169 +605,7 @@ pub fn wrap_math_vec_copy(input: proc_macro::TokenStream) -> proc_macro::TokenSt
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let meta_method_idents = {
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let idents = input.meta_method_idents.iter().map(|metamethod| {
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let metamethod_ident = &metamethod.ident;
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let mm_str = metamethod.ident.to_string();
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let mm_str = mm_str.as_str();
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match mm_str {
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"Add" | "Sub" | "Div" | "Mul" | "Mod" => {
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let symbol = match mm_str {
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"Add" => quote!(+),
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"Sub" => quote!(-),
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"Div" => quote!(/),
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"Mul" => quote!(*),
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"Mod" => quote!(%),
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_ => unreachable!(),
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};
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// create a temporary vec to chain with metamethod.mods. If no parameters
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// were provided, add the wrapper to the list of parameters.
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let t = if metamethod.mods.is_empty() {
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vec![wrapper_typename.clone()]
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} else { vec![] };
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let mods = metamethod.mods.iter().chain(t.iter()).map(|param| {
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let other = if param.to_string().starts_with("Lua") {
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quote!(other.0)
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} else {
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quote!(other)
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};
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quote! {
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methods.add_meta_method(mlua::MetaMethod::#metamethod_ident,
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|_, this, (other,): (#param,)| {
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Ok(#wrapper_typename(this.0 #symbol #other))
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});
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}
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});
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quote! {
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#(#mods)*
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}
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},
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"Unm" => {
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quote! {
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methods.add_meta_method(mlua::MetaMethod::#metamethod_ident, |_, this, ()| {
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Ok(#wrapper_typename(-this.0))
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});
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}
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},
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// Eq meta method has a different implementation than the above methods.
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"Eq" => {
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quote! {
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methods.add_meta_method(mlua::MetaMethod::#metamethod_ident,
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|_, this, (other,): (#wrapper_typename,)| {
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Ok(this.0 == other.0)
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});
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}
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},
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"Shl" => {
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// create a temporary vec to chain with metamethod.mods. If no parameters
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// were provided, add the wrapper to the list of parameters.
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let t = if metamethod.mods.is_empty() {
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vec![wrapper_typename.clone()]
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} else { vec![] };
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let mods = metamethod.mods.iter().chain(t.iter()).map(|param| {
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let other = if param.to_string().starts_with("Lua") {
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quote!(other.0)
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} else {
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quote!(other)
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};
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quote! {
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methods.add_meta_method(mlua::MetaMethod::#metamethod_ident,
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|_, this, (other,): (#param,)| {
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Ok(#wrapper_typename(this.0 << #other))
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});
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}
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});
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quote! {
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#(#mods)*
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}
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}
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"Shr" => {
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// create a temporary vec to chain with metamethod.mods. If no parameters
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// were provided, add the wrapper to the list of parameters.
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let t = if metamethod.mods.is_empty() {
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vec![wrapper_typename.clone()]
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} else { vec![] };
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let mods = metamethod.mods.iter().chain(t.iter()).map(|param| {
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let other = if param.to_string().starts_with("Lua") {
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quote!(other.0)
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} else {
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quote!(other)
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};
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quote! {
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methods.add_meta_method(mlua::MetaMethod::#metamethod_ident,
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|_, this, (other,): (#param,)| {
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Ok(#wrapper_typename(this.0 >> #other))
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});
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}
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});
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quote! {
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#(#mods)*
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}
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},
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"BAnd" | "BOr" | "BXor" => {
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let symbol = match mm_str {
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"BAnd" => {
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quote!(&)
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},
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"BOr" => {
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quote!(|)
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},
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"BXor" => {
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quote!(^)
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},
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_ => unreachable!() // the string was just checked to be one of these
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};
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// create a temporary vec to chain with metamethod.mods. If no parameters
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// were provided, add the wrapper to the list of parameters.
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let t = if metamethod.mods.is_empty() {
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vec![wrapper_typename.clone()]
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} else { vec![] };
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let mods = metamethod.mods.iter().chain(t.iter()).map(|param| {
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let other = if param.to_string().starts_with("Lua") {
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quote!(other.0)
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} else {
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quote!(other)
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};
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quote! {
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methods.add_meta_method(mlua::MetaMethod::#metamethod_ident,
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|_, this, (other,): (#param,)| {
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Ok(#wrapper_typename(this.0 #symbol #other))
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});
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}
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});
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quote! {
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#(#mods)*
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}
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},
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"BNot" => {
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quote! {
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methods.add_meta_method(mlua::MetaMethod::#metamethod_ident, |_, this, ()| {
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Ok(#wrapper_typename(!this.0))
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});
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}
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},
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"ToString" => {
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quote! {
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methods.add_meta_method(mlua::MetaMethod::ToString, |_, this, ()| {
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Ok(format!("{:?}", this.0))
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});
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}
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},
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_ => syn::Error::new_spanned(metamethod_ident,
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"unsupported auto implementation of metamethod").to_compile_error(),
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}
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metamethod.to_tokens(&wrapper_typename)
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});
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quote! {
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|
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@ -17,8 +17,7 @@ wrap_math_vec_copy!(
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Div(LuaVec2, f32),
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Mul(LuaVec2, f32),
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Mod(LuaVec2, f32),
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Eq,
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Unm
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Eq, Unm, ToString
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)
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);
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wrap_math_vec_copy!(
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@ -26,58 +25,15 @@ wrap_math_vec_copy!(
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derives(PartialEq),
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fields(x, y, z),
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metamethods(
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Add(LuaVec3),
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Add(LuaVec3, f32),
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Sub(LuaVec3, f32),
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Div(LuaVec3, f32),
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//Mul(LuaVec3, f32),
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Mul(LuaVec3, f32),
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Mod(LuaVec3, f32),
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Eq, Unm, ToString,
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),
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custom_methods {
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methods.add_meta_method(mlua::MetaMethod::Mul, |_, this, (v,): (mlua::Value,)| {
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match v {
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mlua::Value::Number(n) => {
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Ok(Self(this.0 * (n as f32)))
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},
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mlua::Value::UserData(ud) => {
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if let Ok(other_this) = ud.borrow::<Self>() {
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Ok(Self(this.0 * other_this.0))
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} else {
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if let Ok(mt) = ud.get_metatable() {
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if let Ok(name) = mt.get::<String>("__name") {
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return Err(mlua::Error::BadArgument {
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to: Some("LuaVec3.__mul".to_string()),
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pos: 2,
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name: Some("rhs".to_string()),
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cause: Arc::new(mlua::Error::RuntimeError(
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format!("cannot multiply with unknown userdata named {}", name)
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))
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});
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}
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}
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Err(mlua::Error::BadArgument {
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to: Some("LuaVec3.__mul".to_string()),
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pos: 2,
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name: Some("rhs".to_string()),
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cause: Arc::new(
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mlua::Error::runtime("cannot multiply with unknown userdata")
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)
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})
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}
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},
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_ => Err(mlua::Error::BadArgument {
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to: Some("LuaVec3.__mul".to_string()),
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pos: 2,
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name: Some("rhs".to_string()),
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cause: Arc::new(
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mlua::Error::RuntimeError(format!("cannot multiply with {}", v.type_name()))
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)
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})
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}
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});
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}
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Eq, Unm, ToString
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)
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);
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/* wrap_math_vec_copy!(
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math::Vec3A,
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derives(PartialEq),
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|
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@ -492,7 +448,7 @@ wrap_math_vec_copy!(
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wrap_math_vec_copy!(
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math::Transform,
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//derives(PartialEq),
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derives(PartialEq),
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no_new,
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||||
metamethods(ToString, Eq),
|
||||
custom_fields {
|
||||
|
|
|
|||
Loading…
Reference in New Issue