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//!
//! Macro helpers around derive macro and structure [`syn ::DeriveInput`].
//!
/// Define a private namespace for all its items.
mod private
{
use crate :: *;
use syn ::punctuated ::Punctuated;
///
/// Extracts the named fields from a struct defined in a `syn ::DeriveInput`.
///
/// This function specifically handles `syn ::DeriveInput` that represent structs
/// with named fields. It will return an error if the provided AST does not conform to these expectations.
///
/// # Example
///
/// ```rust, ignore
/// let ast = match syn ::parse :: < syn ::DeriveInput >( input )
/// {
/// Ok( syntax_tree ) => syntax_tree,
/// Err( err ) => return Err( err ),
/// };
/// let fields = derive.named_fields( &ast );
/// ```
/// # Errors
/// qqq: doc
pub fn named_fields(ast: &syn ::DeriveInput) -> crate ::Result< &Punctuated<syn ::Field, syn ::token ::Comma >>
{
let fields = match ast.data
{
syn ::Data ::Struct(ref data_struct) => match data_struct.fields
{
syn ::Fields ::Named(ref fields_named) => &fields_named.named,
_ =>
{
return Err(syn_err!(
ast,
"Unknown format of data, expected syn ::Fields ::Named( ref fields_named )\n {}",
qt! { #ast }
))
}
},
_ =>
{
return Err(syn_err!(
ast,
"Unknown format of data, expected syn ::Data ::Struct( ref data_struct )\n {}",
qt! { #ast }
))
}
};
Ok(fields)
}
}
#[ doc( inline ) ]
#[ allow( unused_imports ) ]
pub use own :: *;
/// Own namespace of the module.
#[ allow( unused_imports ) ]
pub mod own
{
use super :: *;
#[ doc( inline ) ]
pub use orphan :: *;
#[ doc( inline ) ]
pub use private :: { named_fields };
}
/// Parented namespace of the module.
#[ allow( unused_imports ) ]
pub mod orphan
{
use super :: *;
#[ doc( inline ) ]
pub use exposed :: *;
}
/// Exposed namespace of the module.
#[ allow( unused_imports ) ]
pub mod exposed
{
use super :: *;
pub use super ::super ::derive;
#[ doc( inline ) ]
pub use prelude :: *;
#[ doc( inline ) ]
pub use private :: { };
}
/// Prelude to use essentials: `use my_module ::prelude :: *`.
#[ allow( unused_imports ) ]
pub mod prelude
{
use super :: *;
#[ doc( inline ) ]
pub use private :: { };
}