aboutsummaryrefslogtreecommitdiff
path: root/syrette_macros/src/injectable_impl.rs
diff options
context:
space:
mode:
Diffstat (limited to 'syrette_macros/src/injectable_impl.rs')
-rw-r--r--syrette_macros/src/injectable_impl.rs245
1 files changed, 0 insertions, 245 deletions
diff --git a/syrette_macros/src/injectable_impl.rs b/syrette_macros/src/injectable_impl.rs
deleted file mode 100644
index 3000253..0000000
--- a/syrette_macros/src/injectable_impl.rs
+++ /dev/null
@@ -1,245 +0,0 @@
-use quote::{quote, ToTokens};
-use syn::parse::{Parse, ParseStream};
-use syn::{
- parse_str, punctuated::Punctuated, token::Comma, ExprMethodCall, FnArg,
- GenericArgument, Ident, ImplItem, ImplItemMethod, ItemImpl, Path, PathArguments,
- Type, TypePath,
-};
-
-const DI_CONTAINER_VAR_NAME: &str = "di_container";
-
-pub struct InjectableImpl
-{
- pub dependency_types: Vec<Type>,
- pub self_type: Type,
- pub original_impl: ItemImpl,
-}
-
-impl Parse for InjectableImpl
-{
- fn parse(input: ParseStream) -> syn::Result<Self>
- {
- match input.parse::<ItemImpl>() {
- Ok(impl_parsed_input) => {
- match Self::_get_dependency_types(&impl_parsed_input) {
- Ok(dependency_types) => Ok(Self {
- dependency_types,
- self_type: impl_parsed_input.self_ty.as_ref().clone(),
- original_impl: impl_parsed_input,
- }),
- Err(error_msg) => Err(input.error(error_msg)),
- }
- }
- Err(_) => Err(input.error("Expected an impl")),
- }
- }
-}
-
-impl InjectableImpl
-{
- pub fn expand(&self) -> proc_macro2::TokenStream
- {
- let original_impl = &self.original_impl;
- let self_type = &self.self_type;
-
- let di_container_var: Ident = parse_str(DI_CONTAINER_VAR_NAME).unwrap();
-
- let get_dependencies = Self::_create_get_dependencies(&self.dependency_types);
-
- quote! {
- #original_impl
-
- impl syrette::interfaces::injectable::Injectable for #self_type {
- fn resolve(
- #di_container_var: &syrette::DIContainer
- ) -> error_stack::Result<
- syrette::ptr::InterfacePtr<Self>,
- syrette::errors::injectable::ResolveError>
- {
- use error_stack::ResultExt;
-
- return Ok(syrette::ptr::InterfacePtr::new(Self::new(
- #(#get_dependencies
- .change_context(syrette::errors::injectable::ResolveError)
- .attach_printable(
- format!(
- "Unable to resolve a dependency of {}",
- std::any::type_name::<#self_type>()
- )
- )?
- ),*
- )));
- }
- }
- }
- }
-
- fn _create_get_dependencies(dependency_types: &[Type]) -> Vec<ExprMethodCall>
- {
- dependency_types
- .iter()
- .filter_map(|dep_type| match dep_type {
- Type::TraitObject(dep_type_trait) => Some(
- parse_str(
- format!(
- "{}.get::<{}>()",
- DI_CONTAINER_VAR_NAME,
- dep_type_trait.to_token_stream()
- )
- .as_str(),
- )
- .unwrap(),
- ),
- Type::Path(dep_type_path) => {
- let dep_type_path_str = Self::_path_to_string(&dep_type_path.path);
-
- let get_method_name = if dep_type_path_str.ends_with("Factory") {
- "get_factory"
- } else {
- "get"
- };
-
- Some(
- parse_str(
- format!(
- "{}.{}::<{}>()",
- DI_CONTAINER_VAR_NAME, get_method_name, dep_type_path_str
- )
- .as_str(),
- )
- .unwrap(),
- )
- }
- &_ => None,
- })
- .collect()
- }
-
- fn _find_method_by_name<'impl_lt>(
- item_impl: &'impl_lt ItemImpl,
- method_name: &'static str,
- ) -> Option<&'impl_lt ImplItemMethod>
- {
- let impl_items = &item_impl.items;
-
- impl_items
- .iter()
- .filter_map(|impl_item| match impl_item {
- ImplItem::Method(method_item) => Some(method_item),
- &_ => None,
- })
- .find(|method_item| method_item.sig.ident == method_name)
- }
-
- #[allow(clippy::match_wildcard_for_single_variants)]
- fn get_has_fn_args_self(fn_args: &Punctuated<FnArg, Comma>) -> bool
- {
- fn_args.iter().any(|arg| match arg {
- FnArg::Receiver(_) => true,
- &_ => false,
- })
- }
-
- fn _get_fn_arg_type_paths(fn_args: &Punctuated<FnArg, Comma>) -> Vec<&TypePath>
- {
- fn_args
- .iter()
- .filter_map(|arg| match arg {
- FnArg::Typed(typed_fn_arg) => match typed_fn_arg.ty.as_ref() {
- Type::Path(arg_type_path) => Some(arg_type_path),
- Type::Reference(ref_type_path) => match ref_type_path.elem.as_ref() {
- Type::Path(arg_type_path) => Some(arg_type_path),
- &_ => None,
- },
- &_ => None,
- },
- FnArg::Receiver(_receiver_fn_arg) => None,
- })
- .collect()
- }
-
- fn _path_to_string(path: &Path) -> String
- {
- path.segments
- .pairs()
- .fold(String::new(), |mut acc, segment_pair| {
- let segment_ident = &segment_pair.value().ident;
-
- acc.push_str(segment_ident.to_string().as_str());
-
- let opt_colon_two = segment_pair.punct();
-
- match opt_colon_two {
- Some(colon_two) => {
- acc.push_str(colon_two.to_token_stream().to_string().as_str());
- }
- None => {}
- }
-
- acc
- })
- }
-
- fn _is_type_path_ptr(type_path: &TypePath) -> bool
- {
- let arg_type_path_string = Self::_path_to_string(&type_path.path);
-
- arg_type_path_string == "InterfacePtr"
- || arg_type_path_string == "ptr::InterfacePtr"
- || arg_type_path_string == "syrrete::ptr::InterfacePtr"
- || arg_type_path_string == "FactoryPtr"
- || arg_type_path_string == "ptr::FactoryPtr"
- || arg_type_path_string == "syrrete::ptr::FactoryPtr"
- }
-
- fn _get_dependency_types(item_impl: &ItemImpl) -> Result<Vec<Type>, &'static str>
- {
- let new_method_impl_item = match Self::_find_method_by_name(item_impl, "new") {
- Some(method_item) => Ok(method_item),
- None => Err("Missing a 'new' method"),
- }?;
-
- let new_method_args = &new_method_impl_item.sig.inputs;
-
- if Self::get_has_fn_args_self(new_method_args) {
- return Err("Unexpected self argument in 'new' method");
- }
-
- let new_method_arg_type_paths = Self::_get_fn_arg_type_paths(new_method_args);
-
- if new_method_arg_type_paths
- .iter()
- .any(|arg_type_path| !Self::_is_type_path_ptr(arg_type_path))
- {
- return Err("All argument types in 'new' method must ptr types");
- }
-
- Ok(new_method_arg_type_paths
- .iter()
- .filter_map(|arg_type_path| {
- // Assume the type path has a last segment.
- let last_path_segment = arg_type_path.path.segments.last().unwrap();
-
- match &last_path_segment.arguments {
- PathArguments::AngleBracketed(angle_bracketed_generic_args) => {
- let generic_args = &angle_bracketed_generic_args.args;
-
- let opt_first_generic_arg = generic_args.first();
-
- // Assume a first generic argument exists because InterfacePtr and
- // FactoryPtr requires one
- let first_generic_arg = opt_first_generic_arg.as_ref().unwrap();
-
- match first_generic_arg {
- GenericArgument::Type(first_generic_arg_type) => {
- Some(first_generic_arg_type.clone())
- }
- &_ => None,
- }
- }
- &_ => None,
- }
- })
- .collect())
- }
-}