1 files changed, 78 insertions, 0 deletions
diff --git a/bzipper_macros/src/impls/deserialise_struct.rs b/bzipper_macros/src/impls/deserialise_struct.rs
new file mode 100644
index 0000000..414a313
--- /dev/null
+++ b/bzipper_macros/src/impls/deserialise_struct.rs
@@ -0,0 +1,78 @@
+// Copyright 2024 Gabriel Bjørnager Jensen.
+//
+// This file is part of bzipper.
+//
+// bzipper is free software: you can redistribute
+// it and/or modify it under the terms of the GNU
+// Lesser General Public License as published by
+// the Free Software Foundation, either version 3
+// of the License, or (at your option) any later
+// version.
+//
+// bzipper is distributed in the hope that it will
+// be useful, but WITHOUT ANY WARRANTY; without
+// even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Less-
+// er General Public License along with bzipper. If
+// not, see <https://www.gnu.org/licenses/>.
+
+use proc_macro2::TokenStream;
+use quote::quote;
+use syn::{DataStruct, Fields, Token};
+use syn::punctuated::Punctuated;
+
+#[must_use]
+pub fn deserialise_struct(data: &DataStruct) -> TokenStream {
+	if let Fields::Named(..) = data.fields {
+		let mut chain_commands = Punctuated::<TokenStream, Token![,]>::new();
+
+		for field in &data.fields {
+			let name = field.ident.as_ref().unwrap();
+			let ty   = &field.ty;
+
+			chain_commands.push(quote! { #name: stream.take::<#ty>()? });
+		}
+
+		quote! {
+			fn deserialise(data: &[u8]) -> ::bzipper::Result<Self> {
+				::core::debug_assert_eq!(data.len(), <Self as ::bzipper::Serialise>::SERIALISED_SIZE);
+
+				let stream = ::bzipper::Dstream::new(data);
+
+				Ok(Self { #chain_commands })
+			}
+		}
+	} else if let Fields::Unnamed(..) = data.fields {
+		let mut chain_commands = Punctuated::<TokenStream, Token![,]>::new();
+
+		for field in &data.fields {
+			let ty = &field.ty;
+
+			chain_commands.push(quote! { stream.take::<#ty>()? });
+		}
+
+		quote! {
+			fn deserialise(data: &[u8]) -> ::bzipper::Result<Self> {
+				::core::debug_assert_eq!(data.len(), <Self as ::bzipper::Serialise>::SERIALISED_SIZE);
+
+				let stream = ::bzipper::Dstream::new(data);
+
+				Ok(Self(#chain_commands))
+			}
+		}
+	} else {
+		// Fields::Unit
+
+		quote! {
+			#[inline(always)]
+			fn deserialise(data: &[u8]) -> ::bzipper::Result<Self> {
+				::core::debug_assert_eq!(data.len(), <Self as ::bzipper::Serialise>::SERIALISED_SIZE);
+
+				Ok(Self)
+			}
+		}
+	}
+}