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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,147 @@ | ||
| use std::borrow::Cow; | ||
|
|
||
| use proc_macro2::TokenStream; | ||
| use quote::quote; | ||
| use syn::{parse_quote, Expr, FnArg, Ident, Stmt, Type}; | ||
|
|
||
| use crate::{ | ||
| refident::{MaybeIdent, MaybeType}, | ||
| resolver::Resolver, | ||
| utils::IsLiteralExpression, | ||
| }; | ||
|
|
||
| pub(crate) fn resolve_aruments<'a>( | ||
| args: impl Iterator<Item = &'a FnArg>, | ||
| resolver: &impl Resolver, | ||
| generic_types: &[Ident], | ||
| ) -> TokenStream { | ||
| let define_vars = args.map(|arg| ArgumentResolver::new(resolver, generic_types).resolve(arg)); | ||
| quote! { | ||
| #(#define_vars)* | ||
| } | ||
| } | ||
|
|
||
| struct ArgumentResolver<'resolver, 'idents, 'f, R> | ||
| where | ||
| R: Resolver + 'resolver, | ||
| { | ||
| resolver: &'resolver R, | ||
| generic_types_names: &'idents [Ident], | ||
| magic_conversion: &'f dyn Fn(Cow<Expr>, &Type) -> Expr, | ||
| } | ||
|
|
||
| impl<'resolver, 'idents, 'f, R> ArgumentResolver<'resolver, 'idents, 'f, R> | ||
| where | ||
| R: Resolver + 'resolver, | ||
| { | ||
| fn new(resolver: &'resolver R, generic_types_names: &'idents [Ident]) -> Self { | ||
| Self { | ||
| resolver, | ||
| generic_types_names, | ||
| magic_conversion: &handling_magic_conversion_code, | ||
| } | ||
| } | ||
|
|
||
| fn resolve(&self, arg: &FnArg) -> Option<Stmt> { | ||
| let ident = arg.maybe_ident()?; | ||
| let arg_type = arg.maybe_type()?; | ||
| let fixture_name = self.fixture_name(ident); | ||
|
|
||
| let mut fixture = self | ||
| .resolver | ||
| .resolve(&fixture_name) | ||
| .map(|e| e.clone()) | ||
| .unwrap_or_else(|| default_fixture_resolve(&fixture_name)); | ||
|
|
||
| if fixture.is_literal() && self.type_can_be_get_from_literal_str(arg_type) { | ||
| fixture = Cow::Owned((self.magic_conversion)(fixture, arg_type)); | ||
| } | ||
| Some(parse_quote! { | ||
| let #ident = #fixture; | ||
| }) | ||
| } | ||
|
|
||
| fn fixture_name<'a>(&self, ident: &'a Ident) -> Cow<'a, Ident> { | ||
| let id_str = ident.to_string(); | ||
| if id_str.starts_with("_") && !id_str.starts_with("__") { | ||
| Cow::Owned(Ident::new(&id_str[1..], ident.span())) | ||
| } else { | ||
| Cow::Borrowed(ident) | ||
| } | ||
| } | ||
|
|
||
| fn type_can_be_get_from_literal_str(&self, t: &Type) -> bool { | ||
| // Check valid type to apply magic conversion | ||
| match t { | ||
| Type::ImplTrait(_) | ||
| | Type::TraitObject(_) | ||
| | Type::Infer(_) | ||
| | Type::Group(_) | ||
| | Type::Macro(_) | ||
| | Type::Never(_) | ||
| | Type::Paren(_) | ||
| | Type::Verbatim(_) | ||
| | Type::Slice(_) => return false, | ||
| _ => {} | ||
| } | ||
| match t.maybe_ident() { | ||
| Some(id) => !self.generic_types_names.contains(id), | ||
| None => true, | ||
| } | ||
| } | ||
| } | ||
|
|
||
| fn default_fixture_resolve(ident: &Ident) -> Cow<Expr> { | ||
| Cow::Owned(parse_quote! { #ident::default() }) | ||
| } | ||
|
|
||
| fn handling_magic_conversion_code(fixture: Cow<Expr>, arg_type: &Type) -> Expr { | ||
| parse_quote! { | ||
| { | ||
| struct __Wrap<T>(std::marker::PhantomData<T>); | ||
|
|
||
| trait __ViaParseDebug<'a, T> { | ||
| fn magic_conversion(&self, input: &'a str) -> T; | ||
| } | ||
|
|
||
| impl<'a, T> __ViaParseDebug<'a, T> for &&__Wrap<T> | ||
| where | ||
| T: std::str::FromStr, | ||
| T::Err: std::fmt::Debug, | ||
| { | ||
| fn magic_conversion(&self, input: &'a str) -> T { | ||
| T::from_str(input).unwrap() | ||
| } | ||
| } | ||
|
|
||
| trait __ViaParse<'a, T> { | ||
| fn magic_conversion(&self, input: &'a str) -> T; | ||
| } | ||
|
|
||
| impl<'a, T> __ViaParse<'a, T> for &__Wrap<T> | ||
| where | ||
| T: std::str::FromStr, | ||
| { | ||
| fn magic_conversion(&self, input: &'a str) -> T { | ||
| match T::from_str(input) { | ||
| Ok(v) => v, | ||
| Err(_) => { | ||
| panic!("Cannot parse '{}' to get {}", input, std::stringify!(#arg_type)); | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| trait __ViaIdent<'a, T> { | ||
| fn magic_conversion(&self, input: &'a str) -> T; | ||
| } | ||
|
|
||
| impl<'a> __ViaIdent<'a, &'a str> for &&__Wrap<&'a str> { | ||
| fn magic_conversion(&self, input: &'a str) -> &'a str { | ||
| input | ||
| } | ||
| } | ||
| (&&&__Wrap::<#arg_type>(std::marker::PhantomData)).magic_conversion(#fixture) | ||
| } | ||
| } | ||
| } |
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