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Rustfmt malloc_size_of & derive

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This commit is contained in:
Pyfisch 2018-09-05 10:32:44 +02:00
parent 41a2010ee7
commit 5ba4df0441
2 changed files with 161 additions and 107 deletions
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59
components/malloc_size_of_derive/lib.rs
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@ -11,25 +11,36 @@
//! A crate for deriving the MallocSizeOf trait.
extern crate quote;
#[macro_use] extern crate syn;
#[macro_use] extern crate synstructure;
#[macro_use]
extern crate syn;
#[macro_use]
extern crate synstructure;
#[cfg(not(test))]
decl_derive!([MallocSizeOf, attributes(ignore_malloc_size_of)] => malloc_size_of_derive);
fn malloc_size_of_derive(s: synstructure::Structure) -> quote::Tokens {
let match_body = s.each(|binding| {
let ignore = binding.ast().attrs.iter().any(|attr| match attr.interpret_meta().unwrap() {
syn::Meta::Word(ref ident) |
syn::Meta::List(syn::MetaList { ref ident, .. }) if ident == "ignore_malloc_size_of" => {
panic!("#[ignore_malloc_size_of] should have an explanation, \
e.g. #[ignore_malloc_size_of = \"because reasons\"]");
}
syn::Meta::NameValue(syn::MetaNameValue { ref ident, .. }) if ident == "ignore_malloc_size_of" => {
true
}
_ => false,
});
let ignore = binding
.ast()
.attrs
.iter()
.any(|attr| match attr.interpret_meta().unwrap() {
syn::Meta::Word(ref ident) | syn::Meta::List(syn::MetaList { ref ident, .. })
if ident == "ignore_malloc_size_of" =>
{
panic!(
"#[ignore_malloc_size_of] should have an explanation, \
e.g. #[ignore_malloc_size_of = \"because reasons\"]"
);
}
syn::Meta::NameValue(syn::MetaNameValue { ref ident, .. })
if ident == "ignore_malloc_size_of" =>
{
true
},
_ => false,
});
if ignore {
None
} else if let syn::Type::Array(..) = binding.ast().ty {
@ -51,7 +62,9 @@ fn malloc_size_of_derive(s: synstructure::Structure) -> quote::Tokens {
let mut where_clause = where_clause.unwrap_or(&parse_quote!(where)).clone();
for param in ast.generics.type_params() {
let ident = param.ident;
where_clause.predicates.push(parse_quote!(#ident: ::malloc_size_of::MallocSizeOf));
where_clause
.predicates
.push(parse_quote!(#ident: ::malloc_size_of::MallocSizeOf));
}
let tokens = quote! {
@ -73,18 +86,23 @@ fn malloc_size_of_derive(s: synstructure::Structure) -> quote::Tokens {
#[test]
fn test_struct() {
let source =
syn::parse_str("struct Foo<T> { bar: Bar, baz: T, #[ignore_malloc_size_of = \"\"] z: Arc<T> }").unwrap();
let source = syn::parse_str(
"struct Foo<T> { bar: Bar, baz: T, #[ignore_malloc_size_of = \"\"] z: Arc<T> }",
).unwrap();
let source = synstructure::Structure::new(&source);
let expanded = malloc_size_of_derive(source).to_string();
let mut no_space = expanded.replace(" ", "");
macro_rules! match_count {
($e: expr, $count: expr) => {
assert_eq!(no_space.matches(&$e.replace(" ", "")).count(), $count,
"counting occurences of {:?} in {:?} (whitespace-insensitive)",
$e, expanded)
}
assert_eq!(
no_space.matches(&$e.replace(" ", "")).count(),
$count,
"counting occurences of {:?} in {:?} (whitespace-insensitive)",
$e,
expanded
)
};
}
match_count!("struct", 0);
match_count!("ignore_malloc_size_of", 0);
@ -104,4 +122,3 @@ fn test_no_reason() {
let input = syn::parse_str("struct A { #[ignore_malloc_size_of] b: C }").unwrap();
malloc_size_of_derive(synstructure::Structure::new(&input));
}