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|
use std::error::Error;
use quote::{format_ident, quote, ToTokens};
use syn::parse::{Parse, ParseStream};
use syn::Generics;
use syn::{parse_str, ExprMethodCall, FnArg, ItemImpl, Type};
use crate::dependency::Dependency;
use crate::util::item_impl::find_impl_method_by_name_mut;
use crate::util::syn_path::syn_path_to_string;
const DI_CONTAINER_VAR_NAME: &str = "di_container";
const DEPENDENCY_HISTORY_VAR_NAME: &str = "dependency_history";
pub struct InjectableImpl
{
pub dependencies: Vec<Dependency>,
pub self_type: Type,
pub generics: Generics,
pub original_impl: ItemImpl,
}
impl Parse for InjectableImpl
{
fn parse(input: ParseStream) -> syn::Result<Self>
{
let mut impl_parsed_input = input.parse::<ItemImpl>()?;
let dependencies = Self::build_dependencies(&mut impl_parsed_input)
.map_err(|err| input.error(err))?;
Ok(Self {
dependencies,
self_type: impl_parsed_input.self_ty.as_ref().clone(),
generics: impl_parsed_input.generics.clone(),
original_impl: impl_parsed_input,
})
}
}
impl InjectableImpl
{
pub fn expand(&self, no_doc_hidden: bool) -> proc_macro2::TokenStream
{
let Self {
dependencies,
self_type,
generics,
original_impl,
} = self;
let di_container_var = format_ident!("{}", DI_CONTAINER_VAR_NAME);
let dependency_history_var = format_ident!("{}", DEPENDENCY_HISTORY_VAR_NAME);
let get_dep_method_calls = Self::create_get_dep_method_calls(dependencies);
let maybe_doc_hidden = if no_doc_hidden {
quote! {}
} else {
quote! {
#[doc(hidden)]
}
};
let maybe_prevent_circular_deps = if cfg!(feature = "prevent-circular") {
quote! {
if #dependency_history_var.contains(&self_type_name) {
#dependency_history_var.push(self_type_name);
let dependency_trace =
syrette::dependency_trace::create_dependency_trace(
#dependency_history_var.as_slice(),
self_type_name
);
return Err(InjectableError::DetectedCircular {dependency_trace });
}
#dependency_history_var.push(self_type_name);
}
} else {
quote! {}
};
quote! {
#original_impl
#maybe_doc_hidden
impl #generics syrette::interfaces::injectable::Injectable for #self_type {
fn resolve(
#di_container_var: &syrette::DIContainer,
mut #dependency_history_var: Vec<&'static str>,
) -> Result<
syrette::ptr::TransientPtr<Self>,
syrette::errors::injectable::InjectableError>
{
use std::any::type_name;
use syrette::errors::injectable::InjectableError;
let self_type_name = type_name::<#self_type>();
#maybe_prevent_circular_deps
return Ok(syrette::ptr::TransientPtr::new(Self::new(
#(#get_dep_method_calls),*
)));
}
}
}
}
fn create_get_dep_method_calls(
dependencies: &[Dependency],
) -> Vec<proc_macro2::TokenStream>
{
dependencies
.iter()
.filter_map(|dependency| {
let dep_interface_str = match &dependency.interface {
Type::TraitObject(interface_trait) => {
Some(interface_trait.to_token_stream().to_string())
}
Type::Path(path_interface) => {
Some(syn_path_to_string(&path_interface.path))
}
&_ => None,
}?;
let method_call = parse_str::<ExprMethodCall>(
format!(
"{}.get_bound::<{}>({}.clone(), {})",
DI_CONTAINER_VAR_NAME,
dep_interface_str,
DEPENDENCY_HISTORY_VAR_NAME,
dependency.name.as_ref().map_or_else(
|| "None".to_string(),
|name| format!("Some(\"{}\")", name.value())
)
)
.as_str(),
)
.ok()?;
Some((method_call, dependency))
})
.map(|(method_call, dep_type)| {
let ptr_name = dep_type.ptr.to_string();
let to_ptr =
format_ident!("{}", ptr_name.replace("Ptr", "").to_lowercase());
quote! {
#method_call.map_err(|err| InjectableError::ResolveFailed {
reason: Box::new(err),
affected: self_type_name
})?.#to_ptr().unwrap()
}
})
.collect()
}
fn build_dependencies(
item_impl: &mut ItemImpl,
) -> Result<Vec<Dependency>, Box<dyn Error>>
{
let new_method_impl_item = find_impl_method_by_name_mut(item_impl, "new")
.map_or_else(|| Err("Missing a 'new' method"), Ok)?;
let new_method_args = &mut new_method_impl_item.sig.inputs;
let dependencies: Result<Vec<_>, _> =
new_method_args.iter().map(Dependency::build).collect();
for arg in new_method_args {
let typed_arg = if let FnArg::Typed(typed_arg) = arg {
typed_arg
} else {
continue;
};
let attrs_to_remove: Vec<_> = typed_arg
.attrs
.iter()
.enumerate()
.filter_map(|(index, attr)| {
if syn_path_to_string(&attr.path).as_str() == "syrette::named" {
return Some(index);
}
if attr.path.get_ident()?.to_string().as_str() == "named" {
return Some(index);
}
None
})
.collect();
for attr_index in attrs_to_remove {
typed_arg.attrs.remove(attr_index);
}
}
dependencies
}
}
|
