Adding upstream version 1:7.0.3.upstream/1%7.0.3

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 48 insertions, 0 deletions

diff --git a/rust/vendor/nom-derive-impl/src/gen.rs b/rust/vendor/nom-derive-impl/src/gen.rs
new file mode 100644
index 0000000..d3ed1aa
--- /dev/null
+++ b/rust/vendor/nom-derive-impl/src/gen.rs
@@ -0,0 +1,48 @@
+use crate::{endian::ParserEndianness, enums::is_input_fieldless_enum, meta};
+use proc_macro2::{Span, TokenStream};
+use syn::*;
+
+mod enums;
+mod fieldless_enums;
+mod generator;
+mod structs;
+
+use enums::GenEnum;
+use fieldless_enums::GenFieldlessEnum;
+pub(crate) use generator::*;
+use structs::GenStruct;
+
+pub(crate) fn gen_impl(
+    ast: &syn::DeriveInput,
+    endianness: ParserEndianness,
+) -> Result<TokenStream> {
+    // eprintln!("ast: {:#?}", ast);
+    let generator: Box<dyn Generator> = match &ast.data {
+        syn::Data::Enum(_) => {
+            // look for a selector
+            let meta = meta::parse_nom_top_level_attribute(&ast.attrs)?;
+            if meta
+                .iter()
+                .any(|m| m.is_type(meta::attr::MetaAttrType::Selector))
+            {
+                Box::new(GenEnum::from_ast(ast, endianness)?)
+            } else {
+                // no selector, try fieldless enum
+                if is_input_fieldless_enum(ast) {
+                    Box::new(GenFieldlessEnum::from_ast(ast, endianness)?)
+                } else {
+                    return Err(Error::new(
+                        ast.ident.span(),
+                        "Nom-derive: enums must have a 'selector' attribute",
+                    ));
+                }
+            }
+        }
+        syn::Data::Struct(_) => Box::new(GenStruct::from_ast(ast, endianness)?),
+        syn::Data::Union(_) => panic!("Unions not supported"),
+    };
+
+    let impl_tokens = generator.gen_impl()?;
+    // eprintln!("\n***\nglobal_impl: {}\n---\n", impl_tokens);
+    Ok(impl_tokens)
+}