cxxbridge_macro/
lib.rs

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1#![allow(
2    clippy::cast_sign_loss,
3    clippy::default_trait_access,
4    clippy::derive_partial_eq_without_eq,
5    clippy::doc_markdown,
6    clippy::enum_glob_use,
7    clippy::if_same_then_else,
8    clippy::inherent_to_string,
9    clippy::into_iter_without_iter,
10    clippy::items_after_statements,
11    clippy::large_enum_variant,
12    clippy::match_bool,
13    clippy::match_same_arms,
14    clippy::module_name_repetitions,
15    clippy::needless_pass_by_value,
16    clippy::new_without_default,
17    clippy::nonminimal_bool,
18    clippy::or_fun_call,
19    clippy::redundant_else,
20    clippy::shadow_unrelated,
21    clippy::similar_names,
22    clippy::single_match,
23    clippy::single_match_else,
24    clippy::struct_field_names,
25    clippy::too_many_arguments,
26    clippy::too_many_lines,
27    clippy::toplevel_ref_arg,
28    clippy::uninlined_format_args,
29    clippy::useless_let_if_seq
30)]
31
32mod derive;
33mod expand;
34mod generics;
35mod syntax;
36mod tokens;
37mod type_id;
38
39#[cfg(feature = "experimental-enum-variants-from-header")]
40mod clang;
41#[cfg(feature = "experimental-enum-variants-from-header")]
42mod load;
43
44use crate::syntax::file::Module;
45use crate::syntax::namespace::Namespace;
46use crate::syntax::qualified::QualifiedName;
47use crate::type_id::Crate;
48use proc_macro::TokenStream;
49use syn::parse::{Parse, ParseStream, Parser, Result};
50use syn::parse_macro_input;
51
52/// `#[cxx::bridge] mod ffi { ... }`
53///
54/// Refer to the crate-level documentation for the explanation of how this macro
55/// is intended to be used.
56///
57/// The only additional thing to note here is namespace support &mdash; if the
58/// types and functions on the `extern "C++"` side of our bridge are in a
59/// namespace, specify that namespace as an argument of the cxx::bridge
60/// attribute macro.
61///
62/// ```
63/// #[cxx::bridge(namespace = "mycompany::rust")]
64/// # mod ffi {}
65/// ```
66///
67/// The types and functions from the `extern "Rust"` side of the bridge will be
68/// placed into that same namespace in the generated C++ code.
69#[proc_macro_attribute]
70pub fn bridge(args: TokenStream, input: TokenStream) -> TokenStream {
71    let _ = syntax::error::ERRORS;
72
73    let namespace = match Namespace::parse_bridge_attr_namespace.parse(args) {
74        Ok(namespace) => namespace,
75        Err(err) => return err.to_compile_error().into(),
76    };
77    let mut ffi = parse_macro_input!(input as Module);
78    ffi.namespace = namespace;
79
80    expand::bridge(ffi)
81        .unwrap_or_else(|err| err.to_compile_error())
82        .into()
83}
84
85#[doc(hidden)]
86#[proc_macro]
87pub fn type_id(input: TokenStream) -> TokenStream {
88    struct TypeId {
89        krate: Crate,
90        path: QualifiedName,
91    }
92
93    impl Parse for TypeId {
94        fn parse(input: ParseStream) -> Result<Self> {
95            let krate = input.parse().map(Crate::DollarCrate)?;
96            let path = QualifiedName::parse_quoted_or_unquoted(input)?;
97            Ok(TypeId { krate, path })
98        }
99    }
100
101    let arg = parse_macro_input!(input as TypeId);
102    type_id::expand(arg.krate, arg.path).into()
103}
cxxbridge_macro/lib.rs

cxxbridge_macro/
lib.rs
