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use inflector::cases::camelcase::to_camel_case;
use proc_macro2::{TokenStream, TokenTree};
use proc_macro_error::{abort, emit_error, emit_warning};
use quote::{quote_spanned, ToTokens};
use syn::fold::Fold;
use syn::spanned::Spanned;
use syn::{parse_quote, TypePath, Type, PathArguments, GenericArgument};
use syn::{FnArg, ImplItemMethod, Pat, PatIdent, ReturnType, Signature};
use crate::utils::{get_abi, get_env_arg, is_self_method};
use crate::transformation::utils::get_call_type;
use crate::transformation::{CallType, CallTypeAttribute, SafeParams};
use std::collections::HashSet;
use crate::transformation::context::StructContext;
pub struct ImportedMethodTransformer<'ctx> {
pub(crate) struct_context: &'ctx StructContext
}
impl<'ctx> Fold for ImportedMethodTransformer<'ctx> {
fn fold_impl_item_method(&mut self, node: ImplItemMethod) -> ImplItemMethod {
let abi = get_abi(&node.sig);
match (&node.vis, &abi.as_deref()) {
(_, Some("java")) => {
let constructor_attribute = node.attrs.iter().find(|a| a.path.get_ident().map(ToString::to_string).as_deref() == Some("constructor"));
let is_constructor = {
match constructor_attribute {
Some(a) => {
if !a.tokens.is_empty() {
emit_warning!(a.tokens, "#[constructor] attribute does not take parameters")
}
true
},
None => false
}
};
if !node.block.stmts.is_empty() {
emit_error!(
node.block,
"`extern \"java\"` methods must have an empty body"
)
}
let original_signature = node.sig.clone();
let self_method = is_self_method(&node.sig);
let (signature, env_arg) = get_env_arg(node.sig.clone());
let impl_item_attributes: Vec<_> = {
let discarded_known_attributes: HashSet<&str> = {
let mut h = HashSet::new();
h.insert("call_type");
if is_constructor {
h.insert("constructor");
}
h
};
node.clone().attrs
.into_iter()
.filter(|a| {
!discarded_known_attributes
.contains(&a.path.segments.to_token_stream().to_string().as_str())
})
.collect()
};
let dummy = ImplItemMethod {
sig: Signature {
abi: None,
..original_signature.clone()
},
block: parse_quote! {{
unimplemented!()
}},
attrs: impl_item_attributes.clone(),
..node.clone()
};
if is_constructor && self_method {
emit_error!(original_signature,
"cannot have self methods declared as constructors");
return dummy;
}
if env_arg.is_none() {
if !self_method {
emit_error!(
original_signature,
"imported static methods must have a parameter of type `&JNIEnv` as first parameter"
);
} else {
emit_error!(
original_signature,
"imported self methods must have a parameter of type `&JNIEnv` as second parameter"
);
}
return dummy;
}
let call_type_attribute = get_call_type(&node);
let call_type = call_type_attribute.as_ref().map(|c| &c.call_type).unwrap_or(&CallType::Safe(None));
if let Some(CallTypeAttribute { attr, ..}) = &call_type_attribute {
if let CallType::Safe(Some(params)) = call_type {
if let SafeParams { message: Some(_), .. } | SafeParams { exception_class: Some(_), .. } = params {
abort!(attr, "can't have exception message or exception class for imported methods")
}
}
}
let jni_package_path = self
.struct_context
.package
.as_ref()
.map(|p| p.to_string())
.filter(|s| !s.is_empty())
.unwrap_or_else(|| "".into())
.replace('.', "/");
let java_class_path = [jni_package_path, self.struct_context.struct_name.clone()]
.iter()
.filter(|s| !s.is_empty())
.map(|s| s.to_owned())
.collect::<Vec<_>>()
.join("/");
let java_method_name = to_camel_case(&signature.ident.to_string());
let input_types_conversions = signature
.inputs
.iter()
.filter_map(|i| match i {
FnArg::Typed(t) => match &*t.pat {
Pat::Ident(PatIdent { ident, .. }) if ident == "self" => None,
_ => Some((&t.ty, t.ty.span()))
},
FnArg::Receiver(_) => None,
})
.map(|(t, span)| {
if let CallType::Safe(_) = call_type {
quote_spanned! { span => <#t as ::robusta_jni::convert::TryIntoJavaValue>::SIG_TYPE, }
} else {
quote_spanned! { span => <#t as ::robusta_jni::convert::IntoJavaValue>::SIG_TYPE, }
}
})
.fold(TokenStream::new(), |t, mut tok| {
t.to_tokens(&mut tok);
tok
});
let output_type_span = {
match &signature.output {
ReturnType::Default => signature.output.span(),
ReturnType::Type(_arrow, ref ty) => ty.span()
}
};
let output_conversion = match signature.output {
ReturnType::Default => quote_spanned!(signature.output.span() => ),
ReturnType::Type(_arrow, ref ty) => {
if is_constructor {
quote_spanned! { output_type_span => "V" }
} else {
match call_type {
CallType::Safe(_) => {
let inner_result_ty = match &**ty {
Type::Path(TypePath { path, .. }) => {
path.segments.last().map(|s| match &s.arguments {
PathArguments::AngleBracketed(a) => {
match &a.args.first().expect("return type must be `::robusta_jni::jni::errors::Result` when using \"java\" ABI with an implicit or \"safe\" `call_type`") {
GenericArgument::Type(t) => t,
_ => abort!(a, "first generic argument in return type must be a type")
}
},
PathArguments::None => {
let user_attribute_message = call_type_attribute.as_ref().map(|_| "because of this attribute");
abort!(s, "return type must be `::robusta_jni::jni::errors::Result` when using \"java\" ABI with an implicit or \"safe\" `call_type`";
help = "replace `{}` with `Result<{}>`", s.ident, s.ident;
help =? call_type_attribute.as_ref().map(|c| c.attr.span()).unwrap() => user_attribute_message)
},
_ => abort!(s, "return type must be `::robusta_jni::jni::errors::Result` when using \"java\" ABI with an implicit or \"safe\" `call_type`")
})
},
_ => abort!(ty, "return type must be `::robusta_jni::jni::errors::Result` when using \"java\" ABI with an implicit or \"safe\" `call_type`")
}.unwrap();
quote_spanned! { output_type_span => <#inner_result_ty as ::robusta_jni::convert::TryIntoJavaValue>::SIG_TYPE }
}
CallType::Unchecked(_) => {
if let Type::Path(TypePath { path, .. }) = ty.as_ref() {
if let Some(r) = path.segments.last().filter(|i| i.ident == "Result") {
if let PathArguments::AngleBracketed(_) = r.arguments {
let call_type_span = call_type_attribute.as_ref().map(|c| c.attr.span());
let call_type_hint = call_type_span.map(|_| "maybe you meant `#[call_type(safe)]`?");
emit_warning!(ty, "using a `Result` type in a `#[call_type(unchecked)]` method";
hint =? call_type_span.unwrap() => call_type_hint)
}
}
}
quote_spanned! { output_type_span => <#ty as ::robusta_jni::convert::IntoJavaValue>::SIG_TYPE }
}
}
}
}
};
let java_signature =
quote_spanned! { signature.span() => ["(", #input_types_conversions ")", #output_conversion].join("") };
let input_conversions = signature.inputs.iter().fold(TokenStream::new(), |mut tok, input| {
match input {
FnArg::Receiver(_) => { tok }
FnArg::Typed(t) => {
let ty = &t.ty;
let pat: TokenStream = {
let pat = &t.pat;
let mut p: TokenTree = parse_quote! { #pat };
p.set_span(ty.span());
p.into()
};
let conversion: TokenStream = if let CallType::Safe(_) = call_type {
quote_spanned! { ty.span() => ::std::convert::Into::into(<#ty as ::robusta_jni::convert::TryIntoJavaValue>::try_into(#pat, &env)?), }
} else {
quote_spanned! { ty.span() => ::std::convert::Into::into(<#ty as ::robusta_jni::convert::IntoJavaValue>::into(#pat, &env)), }
};
conversion.to_tokens(&mut tok);
tok
}
}
});
let return_expr = match call_type {
CallType::Safe(_) => {
if is_constructor {
quote_spanned! { output_type_span =>
res.and_then(|v| ::robusta_jni::convert::TryFromJavaValue::try_from(v, &env))
}
} else {
quote_spanned! { output_type_span =>
res.and_then(|v| ::std::convert::TryInto::try_into(::robusta_jni::convert::JValueWrapper::from(v)))
.and_then(|v| ::robusta_jni::convert::TryFromJavaValue::try_from(v, &env))
}
}
}
CallType::Unchecked(_) => {
if is_constructor {
quote_spanned! { output_type_span =>
::robusta_jni::convert::FromJavaValue::from(res, &env)
}
} else {
quote_spanned! { output_type_span =>
::std::convert::TryInto::try_into(::robusta_jni::convert::JValueWrapper::from(res))
.map(|v| ::robusta_jni::convert::FromJavaValue::from(v, &env))
.unwrap()
}
}
}
};
let env_ident = match env_arg.unwrap() {
FnArg::Typed(t) => {
match *t.pat {
Pat::Ident(PatIdent { ident, .. }) => ident,
_ => panic!("non-ident pat in FnArg")
}
},
_ => panic!("Bug -- please report to library author. Expected env parameter, found receiver")
};
ImplItemMethod {
sig: Signature {
abi: None,
..original_signature
},
block: if self_method {
let self_span = node.sig.inputs.iter().next().unwrap().span();
match call_type {
CallType::Safe(_) => {
parse_quote_spanned! { self_span => {
let env: &'_ ::robusta_jni::jni::JNIEnv<'_> = #env_ident;
let res = env.call_method(::robusta_jni::convert::JavaValue::autobox(::robusta_jni::convert::TryIntoJavaValue::try_into(self, &env)?, &env), #java_method_name, #java_signature, &[#input_conversions]);
#return_expr
}}
}
CallType::Unchecked(_) => {
parse_quote_spanned! { self_span => {
let env: &'_ ::robusta_jni::jni::JNIEnv<'_> = #env_ident;
let res = env.call_method(::robusta_jni::convert::JavaValue::autobox(::robusta_jni::convert::IntoJavaValue::into(self, &env), &env), #java_method_name, #java_signature, &[#input_conversions]).unwrap();
#return_expr
}}
}
}
} else {
match call_type {
CallType::Safe(_) => {
if is_constructor {
parse_quote! {{
let env: &'_ ::robusta_jni::jni::JNIEnv<'_> = #env_ident;
let res = env.new_object(#java_class_path, #java_signature, &[#input_conversions]);
#return_expr
}}
} else {
parse_quote! {{
let env: &'_ ::robusta_jni::jni::JNIEnv<'_> = #env_ident;
let res = env.call_static_method(#java_class_path, #java_method_name, #java_signature, &[#input_conversions]);
#return_expr
}}
}
},
CallType::Unchecked(_) => {
if is_constructor {
parse_quote! {{
let env: &'_ ::robusta_jni::jni::JNIEnv<'_> = #env_ident;
let res = env.new_object(#java_class_path, #java_signature, &[#input_conversions]).unwrap();
#return_expr
}}
} else {
parse_quote! {{
let env: &'_ ::robusta_jni::jni::JNIEnv<'_> = #env_ident;
let res = env.call_static_method(#java_class_path, #java_method_name, #java_signature, &[#input_conversions]).unwrap();
#return_expr
}}
}
}
}
},
attrs: impl_item_attributes,
..node
}
}
_ => node,
}
}
}
