diff options
Diffstat (limited to 'macros/src/injectable/dependency.rs')
| -rw-r--r-- | macros/src/injectable/dependency.rs | 337 |
1 files changed, 303 insertions, 34 deletions
diff --git a/macros/src/injectable/dependency.rs b/macros/src/injectable/dependency.rs index 2c5e0fd..314a369 100644 --- a/macros/src/injectable/dependency.rs +++ b/macros/src/injectable/dependency.rs @@ -1,56 +1,77 @@ -use std::error::Error; - use proc_macro2::Ident; use syn::{parse2, FnArg, GenericArgument, LitStr, PathArguments, Type}; use crate::injectable::named_attr_input::NamedAttrInput; use crate::util::syn_path::syn_path_to_string; +/// Interface for a representation of a dependency of a injectable type. +/// +/// Found as a argument in the 'new' method of the type. +#[cfg_attr(test, mockall::automock)] +pub trait IDependency: Sized +{ + /// Build a new `Dependency` from a argument in a 'new' method. + fn build(new_method_arg: &FnArg) -> Result<Self, DependencyError>; + + /// Returns the interface type. + fn get_interface(&self) -> &Type; + + /// Returns the pointer type identity. + fn get_ptr(&self) -> &Ident; + + /// Returns optional name of the dependency. + fn get_name(&self) -> &Option<LitStr>; +} + +/// Representation of a dependency of a injectable type. +/// +/// Found as a argument in the 'new' method of the type. +#[derive(Debug, PartialEq, Eq)] pub struct Dependency { - pub interface: Type, - pub ptr: Ident, - pub name: Option<LitStr>, + interface: Type, + ptr: Ident, + name: Option<LitStr>, } -impl Dependency +impl IDependency for Dependency { - pub fn build(new_method_arg: &FnArg) -> Result<Self, Box<dyn Error>> + fn build(new_method_arg: &FnArg) -> Result<Self, DependencyError> { let typed_new_method_arg = match new_method_arg { FnArg::Typed(typed_arg) => Ok(typed_arg), - FnArg::Receiver(_) => Err("Unexpected self argument in 'new' method"), + FnArg::Receiver(_) => Err(DependencyError::UnexpectedSelfArgument), }?; - let ptr_type_path = match typed_new_method_arg.ty.as_ref() { + let dependency_type_path = match typed_new_method_arg.ty.as_ref() { Type::Path(arg_type_path) => Ok(arg_type_path), Type::Reference(ref_type_path) => match ref_type_path.elem.as_ref() { Type::Path(arg_type_path) => Ok(arg_type_path), - &_ => Err("Unexpected reference to non-path type"), + &_ => Err(DependencyError::TypeNotPath), }, - &_ => Err("Expected a path or a reference type"), + &_ => Err(DependencyError::TypeNotPath), }?; - let ptr_path_segment = ptr_type_path.path.segments.last().map_or_else( - || Err("Expected pointer type path to have a last segment"), - Ok, - )?; + let ptr_path_segment = dependency_type_path + .path + .segments + .last() + .map_or_else(|| Err(DependencyError::PtrTypePathEmpty), Ok)?; - let ptr = ptr_path_segment.ident.clone(); + let ptr_ident = ptr_path_segment.ident.clone(); - let ptr_path_generic_args = &match &ptr_path_segment.arguments { + let ptr_generic_args = &match &ptr_path_segment.arguments { PathArguments::AngleBracketed(generic_args) => Ok(generic_args), - &_ => Err("Expected pointer type to have a generic type argument"), + &_ => Err(DependencyError::PtrTypeNoGenerics), }? .args; - let interface = if let Some(GenericArgument::Type(interface)) = - ptr_path_generic_args.first() - { - Ok(interface.clone()) - } else { - Err("Expected pointer type to have a generic type argument") - }?; + let interface = + if let Some(GenericArgument::Type(interface)) = ptr_generic_args.first() { + Ok(interface.clone()) + } else { + Err(DependencyError::PtrTypeNoGenerics) + }?; let arg_attrs = &typed_new_method_arg.attrs; @@ -63,19 +84,267 @@ impl Dependency let opt_named_attr_tokens = opt_named_attr.map(|attr| &attr.tokens); - let opt_named_attr_input = - if let Some(named_attr_tokens) = opt_named_attr_tokens { - Some(parse2::<NamedAttrInput>(named_attr_tokens.clone()).map_err( - |err| format!("Invalid input for 'named' attribute. {}", err), - )?) - } else { - None - }; + let opt_named_attr_input = if let Some(named_attr_tokens) = opt_named_attr_tokens + { + Some( + parse2::<NamedAttrInput>(named_attr_tokens.clone()) + .map_err(DependencyError::ParseNamedAttrInputFailed)?, + ) + } else { + None + }; Ok(Self { interface, - ptr, + ptr: ptr_ident, name: opt_named_attr_input.map(|named_attr_input| named_attr_input.name), }) } + + fn get_interface(&self) -> &Type + { + &self.interface + } + + fn get_ptr(&self) -> &Ident + { + &self.ptr + } + + fn get_name(&self) -> &Option<LitStr> + { + &self.name + } +} + +#[derive(Debug, thiserror::Error)] +pub enum DependencyError +{ + #[error("Unexpected 'self' argument in 'new' method")] + UnexpectedSelfArgument, + + #[error("Argument type must either be a path or a path reference")] + TypeNotPath, + + #[error("Expected pointer type path to not be empty")] + PtrTypePathEmpty, + + #[error("Expected pointer type to take generic arguments")] + PtrTypeNoGenerics, + + #[error("Failed to parse the input to a 'named' attribute")] + ParseNamedAttrInputFailed(#[source] syn::Error), +} + +#[cfg(test)] +mod tests +{ + use std::error::Error; + + use proc_macro::TokenStream; + use proc_macro2::Span; + use quote::{format_ident, quote}; + use syn::punctuated::Punctuated; + use syn::token::{And, Bang, Bracket, Colon, Paren, Pound, SelfValue}; + use syn::{ + AttrStyle, + Attribute, + Pat, + PatType, + PathSegment, + Receiver, + TypeNever, + TypeReference, + TypeTuple, + }; + + use super::*; + use crate::test_utils; + + #[test] + fn can_build_dependency() -> Result<(), Box<dyn Error>> + { + assert_eq!( + Dependency::build(&FnArg::Typed(PatType { + attrs: vec![], + pat: Box::new(Pat::Verbatim(TokenStream::default().into())), + colon_token: Colon::default(), + ty: Box::new(test_utils::create_type(test_utils::create_path(&[ + test_utils::create_path_segment( + format_ident!("TransientPtr"), + &[test_utils::create_type(test_utils::create_path(&[ + test_utils::create_path_segment(format_ident!("Foo"), &[]) + ]))] + ), + ]))) + }))?, + Dependency { + interface: test_utils::create_type(test_utils::create_path(&[ + PathSegment::from(format_ident!("Foo")) + ])), + ptr: format_ident!("TransientPtr"), + name: None + } + ); + + assert_eq!( + Dependency::build(&FnArg::Typed(PatType { + attrs: vec![], + pat: Box::new(Pat::Verbatim(TokenStream::default().into())), + colon_token: Colon::default(), + ty: Box::new(test_utils::create_type(test_utils::create_path(&[ + test_utils::create_path_segment(format_ident!("syrette"), &[]), + test_utils::create_path_segment(format_ident!("ptr"), &[]), + test_utils::create_path_segment( + format_ident!("SingletonPtr"), + &[test_utils::create_type(test_utils::create_path(&[ + test_utils::create_path_segment(format_ident!("Bar"), &[]) + ]))] + ), + ]))) + }))?, + Dependency { + interface: test_utils::create_type(test_utils::create_path(&[ + PathSegment::from(format_ident!("Bar")) + ])), + ptr: format_ident!("SingletonPtr"), + name: None + } + ); + + Ok(()) + } + + #[test] + fn can_build_dependency_with_name() -> Result<(), Box<dyn Error>> + { + assert_eq!( + Dependency::build(&FnArg::Typed(PatType { + attrs: vec![Attribute { + pound_token: Pound::default(), + style: AttrStyle::Outer, + bracket_token: Bracket::default(), + path: test_utils::create_path(&[test_utils::create_path_segment( + format_ident!("named"), + &[] + )]), + tokens: quote! { ("cool") } + }], + pat: Box::new(Pat::Verbatim(TokenStream::default().into())), + colon_token: Colon::default(), + ty: Box::new(test_utils::create_type(test_utils::create_path(&[ + test_utils::create_path_segment( + format_ident!("TransientPtr"), + &[test_utils::create_type(test_utils::create_path(&[ + test_utils::create_path_segment(format_ident!("Foo"), &[]) + ]))] + ), + ]))) + }))?, + Dependency { + interface: test_utils::create_type(test_utils::create_path(&[ + PathSegment::from(format_ident!("Foo")) + ])), + ptr: format_ident!("TransientPtr"), + name: Some(LitStr::new("cool", Span::call_site())) + } + ); + + assert_eq!( + Dependency::build(&FnArg::Typed(PatType { + attrs: vec![Attribute { + pound_token: Pound::default(), + style: AttrStyle::Outer, + bracket_token: Bracket::default(), + path: test_utils::create_path(&[test_utils::create_path_segment( + format_ident!("named"), + &[] + )]), + tokens: quote! { ("awesome") } + }], + pat: Box::new(Pat::Verbatim(TokenStream::default().into())), + colon_token: Colon::default(), + ty: Box::new(test_utils::create_type(test_utils::create_path(&[ + test_utils::create_path_segment(format_ident!("syrette"), &[]), + test_utils::create_path_segment(format_ident!("ptr"), &[]), + test_utils::create_path_segment( + format_ident!("FactoryPtr"), + &[test_utils::create_type(test_utils::create_path(&[ + test_utils::create_path_segment(format_ident!("Bar"), &[]) + ]))] + ), + ]))) + }))?, + Dependency { + interface: test_utils::create_type(test_utils::create_path(&[ + PathSegment::from(format_ident!("Bar")) + ])), + ptr: format_ident!("FactoryPtr"), + name: Some(LitStr::new("awesome", Span::call_site())) + } + ); + + Ok(()) + } + + #[test] + fn cannot_build_dependency_with_receiver_arg() + { + assert!(Dependency::build(&FnArg::Receiver(Receiver { + attrs: vec![], + reference: None, + mutability: None, + self_token: SelfValue::default() + })) + .is_err()); + } + + #[test] + fn cannot_build_dependency_with_type_not_path() + { + assert!(Dependency::build(&FnArg::Typed(PatType { + attrs: vec![], + pat: Box::new(Pat::Verbatim(TokenStream::default().into())), + colon_token: Colon::default(), + ty: Box::new(Type::Tuple(TypeTuple { + paren_token: Paren::default(), + elems: Punctuated::from_iter(vec![test_utils::create_type( + test_utils::create_path(&[test_utils::create_path_segment( + format_ident!("EvilType"), + &[] + )]) + )]) + })) + })) + .is_err()); + + assert!(Dependency::build(&FnArg::Typed(PatType { + attrs: vec![], + pat: Box::new(Pat::Verbatim(TokenStream::default().into())), + colon_token: Colon::default(), + ty: Box::new(Type::Reference(TypeReference { + and_token: And::default(), + lifetime: None, + mutability: None, + elem: Box::new(Type::Never(TypeNever { + bang_token: Bang::default() + })) + })) + })) + .is_err()); + } + + #[test] + fn cannot_build_dependency_without_generics_args() + { + assert!(Dependency::build(&FnArg::Typed(PatType { + attrs: vec![], + pat: Box::new(Pat::Verbatim(TokenStream::default().into())), + colon_token: Colon::default(), + ty: Box::new(test_utils::create_type(test_utils::create_path(&[ + test_utils::create_path_segment(format_ident!("TransientPtr"), &[]), + ]))) + })) + .is_err()); + } } |