Function code_product_lib::expand_products

pub fn expand_products(input: TokenStream, mode: ScopeMode) -> TokenStream

Expands a product syntax into a TokenStream.

Examples

Complete expansion

let input = quote! {
    impl Foo for @((This)(That)) { }
};

let output = expand_products(input, ScopeMode::Expand);
assert_eq!(
    output.to_string(),
    "impl Foo for This { } \
     impl Foo for That { }");

Sub-expand

let input = quote! {
    let toplevel = thing ;
    @{ impl Foo for @((This)(That)) { } }
    @{ impl Bar for @((This)(That)) { } }
};

let output = expand_products(input, ScopeMode::SubExpand);
assert_eq!(
    output.to_string(),
    "let toplevel = thing ; \
     impl Foo for This { } \
     impl Foo for That { } \
     impl Bar for This { } \
     impl Bar for That { }"
);

Auto-brace-semi

let input = quote! {
    impl Foo for @((This)(That)) { }
    impl Bar for @((This)(That)) { }
};

let output = expand_products(input, ScopeMode::AutoBraceSemi);
assert_eq!(
    output.to_string(),
    "impl Foo for This { } \
     impl Foo for That { } \
     impl Bar for This { } \
     impl Bar for That { }"
);