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Skip wrapping if function returns Dynamicc.

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This commit is contained in:
Stephen Chung 2020-10-15 13:28:22 +08:00
parent 707ece7e80
commit 3c9250b0bf
6 changed files with 119 additions and 65 deletions
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98
codegen/src/function.rs
View File

@ -16,7 +16,6 @@ use quote::{quote, quote_spanned};
use syn::{parse::Parse, parse::ParseStream, parse::Parser, spanned::Spanned};
use crate::attrs::{ExportInfo, ExportScope, ExportedParams};
use crate::rhai_module::flatten_type_groups;
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum Index {
@ -48,10 +47,10 @@ impl FnSpecialAccess {
match self {
FnSpecialAccess::None => None,
FnSpecialAccess::Property(Property::Get(ref g)) => {
Some((format!("get${}", g.to_string()), g.to_string(), g.span()))
Some((format!("{}{}", FN_GET, g), g.to_string(), g.span()))
}
FnSpecialAccess::Property(Property::Set(ref s)) => {
Some((format!("set${}", s.to_string()), s.to_string(), s.span()))
Some((format!("{}{}", FN_SET, s), s.to_string(), s.span()))
}
FnSpecialAccess::Index(Index::Get) => Some((
FN_IDX_GET.to_string(),
@ -67,6 +66,14 @@ impl FnSpecialAccess {
}
}
pub(crate) fn flatten_type_groups(ty: &syn::Type) -> &syn::Type {
match ty {
syn::Type::Group(syn::TypeGroup { ref elem, .. })
| syn::Type::Paren(syn::TypeParen { ref elem, .. }) => flatten_type_groups(elem.as_ref()),
_ => ty,
}
}
#[derive(Debug, Default)]
pub(crate) struct ExportedFnParams {
pub name: Option<Vec<String>>,
@ -76,6 +83,8 @@ pub(crate) struct ExportedFnParams {
pub special: FnSpecialAccess,
}
pub const FN_GET: &str = "get$";
pub const FN_SET: &str = "set$";
pub const FN_IDX_GET: &str = "index$get$";
pub const FN_IDX_SET: &str = "index$set$";
@ -130,36 +139,24 @@ impl ExportedParams for ExportedFnParams {
"use attribute 'index_set' instead",
))
}
("name", Some(s)) if s.value().starts_with("get$") => {
("name", Some(s)) if s.value().starts_with(FN_GET) => {
return Err(syn::Error::new(
item_span,
format!(
"use attribute 'getter = \"{}\"' instead",
&s.value()["get$".len()..]
&s.value()[FN_GET.len()..]
),
))
}
("name", Some(s)) if s.value().starts_with("set$") => {
("name", Some(s)) if s.value().starts_with(FN_SET) => {
return Err(syn::Error::new(
item_span,
format!(
"use attribute 'setter = \"{}\"' instead",
&s.value()["set$".len()..]
&s.value()[FN_SET.len()..]
),
))
}
("name", Some(s)) if s.value().contains('$') => {
return Err(syn::Error::new(
s.span(),
"Rhai function names may not contain dollar sign",
))
}
("name", Some(s)) if s.value().contains('.') => {
return Err(syn::Error::new(
s.span(),
"Rhai function names may not contain dot",
))
}
("name", Some(s)) => name.push(s.value()),
("set", Some(s)) => {
special = match special {
@ -225,6 +222,7 @@ pub(crate) struct ExportedFn {
entire_span: proc_macro2::Span,
signature: syn::Signature,
is_public: bool,
return_dynamic: bool,
mut_receiver: bool,
params: ExportedFnParams,
}
@ -235,6 +233,10 @@ impl Parse for ExportedFn {
let entire_span = fn_all.span();
let str_type_path = syn::parse2::<syn::Path>(quote! { str }).unwrap();
let dynamic_type_path1 = syn::parse2::<syn::Path>(quote! { Dynamic }).unwrap();
let dynamic_type_path2 = syn::parse2::<syn::Path>(quote! { rhai::Dynamic }).unwrap();
let mut return_dynamic = false;
// #[cfg] attributes are not allowed on functions due to what is generated for them
crate::attrs::deny_cfg_attr(&fn_all.attrs)?;
@ -250,11 +252,11 @@ impl Parse for ExportedFn {
}) => true,
syn::FnArg::Typed(syn::PatType { ref ty, .. }) => {
match flatten_type_groups(ty.as_ref()) {
&syn::Type::Reference(syn::TypeReference {
syn::Type::Reference(syn::TypeReference {
mutability: Some(_),
..
}) => true,
&syn::Type::Reference(syn::TypeReference {
syn::Type::Reference(syn::TypeReference {
mutability: None,
ref elem,
..
@ -285,18 +287,18 @@ impl Parse for ExportedFn {
_ => panic!("internal error: receiver argument outside of first position!?"),
};
let is_ok = match flatten_type_groups(ty.as_ref()) {
&syn::Type::Reference(syn::TypeReference {
syn::Type::Reference(syn::TypeReference {
mutability: Some(_),
..
}) => false,
&syn::Type::Reference(syn::TypeReference {
syn::Type::Reference(syn::TypeReference {
mutability: None,
ref elem,
..
}) => {
matches!(flatten_type_groups(elem.as_ref()), &syn::Type::Path(ref p) if p.path == str_type_path)
}
&syn::Type::Verbatim(_) => false,
syn::Type::Verbatim(_) => false,
_ => true,
};
if !is_ok {
@ -308,21 +310,26 @@ impl Parse for ExportedFn {
}
}
// No returning references or pointers.
// Check return type.
if let syn::ReturnType::Type(_, ref rtype) = fn_all.sig.output {
match rtype.as_ref() {
&syn::Type::Ptr(_) => {
match flatten_type_groups(rtype.as_ref()) {
syn::Type::Ptr(_) => {
return Err(syn::Error::new(
fn_all.sig.output.span(),
"cannot return a pointer to Rhai",
"Rhai functions cannot return pointers",
))
}
&syn::Type::Reference(_) => {
syn::Type::Reference(_) => {
return Err(syn::Error::new(
fn_all.sig.output.span(),
"cannot return a reference to Rhai",
"Rhai functions cannot return references",
))
}
syn::Type::Path(p)
if p.path == dynamic_type_path1 || p.path == dynamic_type_path2 =>
{
return_dynamic = true
}
_ => {}
}
}
@ -330,6 +337,7 @@ impl Parse for ExportedFn {
entire_span,
signature: fn_all.sig,
is_public,
return_dynamic,
mut_receiver,
params: ExportedFnParams::default(),
})
@ -419,7 +427,7 @@ impl ExportedFn {
pub(crate) fn return_type(&self) -> Option<&syn::Type> {
if let syn::ReturnType::Type(_, ref rtype) = self.signature.output {
Some(rtype)
Some(flatten_type_groups(rtype))
} else {
None
}
@ -437,7 +445,7 @@ impl ExportedFn {
{
return Err(syn::Error::new(
self.signature.span(),
"return_raw functions must return Result<T>",
"return_raw functions must return Result<T, Box<EvalAltResult>>",
));
}
@ -467,7 +475,7 @@ impl ExportedFn {
FnSpecialAccess::Property(Property::Set(_)) if self.return_type().is_some() => {
return Err(syn::Error::new(
self.signature.span(),
"property setter must return no value",
"property setter cannot return any value",
))
}
// 4a. Index getters must take the subject and the accessed "index" as arguments.
@ -495,7 +503,7 @@ impl ExportedFn {
FnSpecialAccess::Index(Index::Set) if self.return_type().is_some() => {
return Err(syn::Error::new(
self.signature.span(),
"index setter must return no value",
"index setter cannot return a value",
))
}
_ => {}
@ -532,7 +540,7 @@ impl ExportedFn {
dynamic_signature.ident =
syn::Ident::new("dynamic_result_fn", proc_macro2::Span::call_site());
dynamic_signature.output = syn::parse2::<syn::ReturnType>(quote! {
-> Result<Dynamic, EvalBox>
-> Result<Dynamic, Box<EvalAltResult>>
})
.unwrap();
let arguments: Vec<syn::Ident> = dynamic_signature
@ -555,18 +563,22 @@ impl ExportedFn {
.return_type()
.map(|r| r.span())
.unwrap_or_else(|| proc_macro2::Span::call_site());
if !self.params.return_raw {
if self.params.return_raw {
quote_spanned! { return_span=>
type EvalBox = Box<EvalAltResult>;
pub #dynamic_signature {
Ok(Dynamic::from(super::#name(#(#arguments),*)))
super::#name(#(#arguments),*)
}
}
} else if self.return_dynamic {
quote_spanned! { return_span=>
pub #dynamic_signature {
Ok(super::#name(#(#arguments),*))
}
}
} else {
quote_spanned! { return_span=>
type EvalBox = Box<EvalAltResult>;
pub #dynamic_signature {
super::#name(#(#arguments),*)
Ok(Dynamic::from(super::#name(#(#arguments),*)))
}
}
}
@ -734,9 +746,15 @@ impl ExportedFn {
.map(|r| r.span())
.unwrap_or_else(|| proc_macro2::Span::call_site());
let return_expr = if !self.params.return_raw {
if self.return_dynamic {
quote_spanned! { return_span=>
Ok(#sig_name(#(#unpack_exprs),*))
}
} else {
quote_spanned! { return_span=>
Ok(Dynamic::from(#sig_name(#(#unpack_exprs),*)))
}
}
} else {
quote_spanned! { return_span=>
#sig_name(#(#unpack_exprs),*)

9
codegen/src/rhai_module.rs
View File

@ -3,6 +3,7 @@ use std::collections::HashMap;
use quote::{quote, ToTokens};
use crate::attrs::ExportScope;
use crate::function::flatten_type_groups;
use crate::function::{ExportedFn, FnSpecialAccess};
use crate::module::Module;
@ -174,14 +175,6 @@ pub(crate) fn generate_body(
}
}
pub(crate) fn flatten_type_groups(ty: &syn::Type) -> &syn::Type {
match ty {
syn::Type::Group(syn::TypeGroup { ref elem, .. })
| syn::Type::Paren(syn::TypeParen { ref elem, .. }) => flatten_type_groups(elem.as_ref()),
_ => ty,
}
}
pub(crate) fn check_rename_collisions(fns: &Vec<ExportedFn>) -> Result<(), syn::Error> {
fn make_key(name: impl ToString, itemfn: &ExportedFn) -> String {
itemfn

67
codegen/src/test/function.rs
View File

@ -88,7 +88,10 @@ mod function_tests {
};
let err = syn::parse2::<ExportedFn>(input_tokens).unwrap_err();
assert_eq!(format!("{}", err), "cannot return a reference to Rhai");
assert_eq!(
format!("{}", err),
"Rhai functions cannot return references"
);
}
#[test]
@ -98,7 +101,7 @@ mod function_tests {
};
let err = syn::parse2::<ExportedFn>(input_tokens).unwrap_err();
assert_eq!(format!("{}", err), "cannot return a pointer to Rhai");
assert_eq!(format!("{}", err), "Rhai functions cannot return pointers");
}
#[test]
@ -295,8 +298,7 @@ mod generate_tests {
pub fn token_input_types() -> Box<[TypeId]> {
Token().input_types()
}
type EvalBox = Box<EvalAltResult>;
pub fn dynamic_result_fn() -> Result<Dynamic, EvalBox> {
pub fn dynamic_result_fn() -> Result<Dynamic, Box<EvalAltResult> > {
Ok(Dynamic::from(super::do_nothing()))
}
}
@ -340,8 +342,7 @@ mod generate_tests {
pub fn token_input_types() -> Box<[TypeId]> {
Token().input_types()
}
type EvalBox = Box<EvalAltResult>;
pub fn dynamic_result_fn(x: usize) -> Result<Dynamic, EvalBox> {
pub fn dynamic_result_fn(x: usize) -> Result<Dynamic, Box<EvalAltResult> > {
Ok(Dynamic::from(super::do_something(x)))
}
}
@ -351,6 +352,51 @@ mod generate_tests {
assert_streams_eq(item_fn.generate(), expected_tokens);
}
#[test]
fn return_dynamic() {
let input_tokens: TokenStream = quote! {
pub fn return_dynamic() -> (((rhai::Dynamic))) {
().into()
}
};
let expected_tokens = quote! {
#[allow(unused)]
pub mod rhai_fn_return_dynamic {
use super::*;
struct Token();
impl PluginFunction for Token {
fn call(&self,
args: &mut [&mut Dynamic]
) -> Result<Dynamic, Box<EvalAltResult>> {
debug_assert_eq!(args.len(), 0usize,
"wrong arg count: {} != {}", args.len(), 0usize);
Ok(return_dynamic())
}
fn is_method_call(&self) -> bool { false }
fn is_variadic(&self) -> bool { false }
fn clone_boxed(&self) -> Box<dyn PluginFunction> { Box::new(Token()) }
fn input_types(&self) -> Box<[TypeId]> {
new_vec![].into_boxed_slice()
}
}
pub fn token_callable() -> CallableFunction {
Token().into()
}
pub fn token_input_types() -> Box<[TypeId]> {
Token().input_types()
}
pub fn dynamic_result_fn() -> Result<Dynamic, Box<EvalAltResult> > {
Ok(super::return_dynamic())
}
}
};
let item_fn = syn::parse2::<ExportedFn>(input_tokens).unwrap();
assert_streams_eq(item_fn.generate(), expected_tokens);
}
#[test]
fn one_arg_usize_fn_impl() {
let input_tokens: TokenStream = quote! {
@ -417,8 +463,7 @@ mod generate_tests {
pub fn token_input_types() -> Box<[TypeId]> {
Token().input_types()
}
type EvalBox = Box<EvalAltResult>;
pub fn dynamic_result_fn(x: usize, y: usize) -> Result<Dynamic, EvalBox> {
pub fn dynamic_result_fn(x: usize, y: usize) -> Result<Dynamic, Box<EvalAltResult> > {
Ok(Dynamic::from(super::add_together(x, y)))
}
}
@ -464,8 +509,7 @@ mod generate_tests {
pub fn token_input_types() -> Box<[TypeId]> {
Token().input_types()
}
type EvalBox = Box<EvalAltResult>;
pub fn dynamic_result_fn(x: &mut usize, y: usize) -> Result<Dynamic, EvalBox> {
pub fn dynamic_result_fn(x: &mut usize, y: usize) -> Result<Dynamic, Box<EvalAltResult> > {
Ok(Dynamic::from(super::increment(x, y)))
}
}
@ -510,8 +554,7 @@ mod generate_tests {
pub fn token_input_types() -> Box<[TypeId]> {
Token().input_types()
}
type EvalBox = Box<EvalAltResult>;
pub fn dynamic_result_fn(message: &str) -> Result<Dynamic, EvalBox> {
pub fn dynamic_result_fn(message: &str) -> Result<Dynamic, Box<EvalAltResult> > {
Ok(Dynamic::from(super::special_print(message)))
}
}

2
codegen/ui_tests/return_mut_ref.stderr
View File

@ -1,4 +1,4 @@
error: cannot return a reference to Rhai
error: Rhai functions cannot return references
--> $DIR/return_mut_ref.rs:12:38
|
12 | pub fn test_fn(input: &mut Clonable) -> &mut bool {

2
codegen/ui_tests/return_pointer.stderr
View File

@ -1,4 +1,4 @@
error: cannot return a pointer to Rhai
error: Rhai functions cannot return pointers
--> $DIR/return_pointer.rs:12:33
|
12 | pub fn test_fn(input: Clonable) -> *const str {

2
codegen/ui_tests/return_shared_ref.stderr
View File

@ -1,4 +1,4 @@
error: cannot return a reference to Rhai
error: Rhai functions cannot return pointers
--> $DIR/return_shared_ref.rs:12:33
|
12 | pub fn test_fn(input: Clonable) -> &'static str {