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#rust#proc-macro#http

git clone https://pyrossh.dev/repos/rust-embed.git
Discussions: https://groups.google.com/g/rust-embed-devs

rust macro which loads files into the rust binary at compile time during release and loads the file from the fs during dev.

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2644963e — Paolo Barbolini

6 years ago 
Update to syn 1.x
Files changed (2) hide show
  1. impl/Cargo.toml +2 -2
  2. impl/src/lib.rs +22 -17
impl/Cargo.toml CHANGED
@@ -16,8 +16,8 @@ proc-macro = true
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  [dependencies]
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  rust-embed-utils = { version = "5.0.0", path = "../utils"}
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- syn = "0.11"
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+ syn = "1"
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- quote = "0.3"
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+ quote = "1"
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  walkdir = "2.2.7"
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  [dependencies.shellexpand]
impl/src/lib.rs CHANGED
@@ -9,12 +9,11 @@ extern crate shellexpand;
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  extern crate walkdir;
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  use proc_macro::TokenStream;
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- use quote::Tokens;
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  use std::path::Path;
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- use syn::*;
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+ use syn::{export::TokenStream2, Data, DeriveInput, Fields, Lit, Meta};
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  #[cfg(all(debug_assertions, not(feature = "debug-embed")))]
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- fn generate_assets(ident: &syn::Ident, folder_path: String) -> quote::Tokens {
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+ fn generate_assets(ident: &syn::Ident, folder_path: String) -> TokenStream2 {
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  quote! {
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  impl #ident {
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  pub fn get(file_path: &str) -> Option<std::borrow::Cow<'static, [u8]>> {
@@ -56,10 +55,10 @@ fn generate_assets(ident: &syn::Ident, folder_path: String) -> quote::Tokens {
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  }
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  #[cfg(any(not(debug_assertions), feature = "debug-embed"))]
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- fn generate_assets(ident: &syn::Ident, folder_path: String) -> quote::Tokens {
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+ fn generate_assets(ident: &syn::Ident, folder_path: String) -> TokenStream2 {
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  extern crate rust_embed_utils;
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- let mut match_values = Vec::<Tokens>::new();
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+ let mut match_values = Vec::<TokenStream2>::new();
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  let mut list_values = Vec::<String>::new();
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  for rust_embed_utils::FileEntry { rel_path, full_canonical_path } in rust_embed_utils::get_files(folder_path) {
@@ -102,22 +101,29 @@ fn generate_assets(ident: &syn::Ident, folder_path: String) -> quote::Tokens {
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  }
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  }
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- fn impl_rust_embed(ast: &syn::DeriveInput) -> Tokens {
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+ fn impl_rust_embed(ast: &syn::DeriveInput) -> TokenStream2 {
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- match ast.body {
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+ match ast.data {
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- Body::Enum(_) => panic!("RustEmbed cannot be derived for enums"),
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- Body::Struct(ref data) => match data {
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+ Data::Struct(ref data) => match data.fields {
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- &VariantData::Unit => {}
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+ Fields::Unit => {}
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  _ => panic!("RustEmbed can only be derived for unit structs"),
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  },
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+ _ => panic!("RustEmbed can only be derived for unit structs"),
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  };
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+ let attribute = ast
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+ .attrs
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+ .iter()
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+ .find(|value| value.path.is_ident("folder"))
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- let attribute = ast.attrs.iter().map(|attr| &attr.value).find(|value| value.name() == "folder");
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+ .expect("#[derive(RustEmbed)] should contain one attribute like this #[folder = \"examples/public/\"]");
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+ let meta = attribute
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+ .parse_meta()
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+ .expect("#[derive(RustEmbed)] should contain one attribute like this #[folder = \"examples/public/\"]");
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- let literal_value = match attribute {
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+ let literal_value = match meta {
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- Some(&MetaItem::NameValue(_, ref literal)) => literal,
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+ Meta::NameValue(ref data) => &data.lit,
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  _ => panic!("#[derive(RustEmbed)] should contain one attribute like this #[folder = \"examples/public/\"]"),
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  };
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  let folder_path = match literal_value {
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- &Lit::Str(ref val, _) => val.clone(),
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+ Lit::Str(ref val) => val.clone().value(),
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  _ => {
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  panic!("#[derive(RustEmbed)] attribute value must be a string literal");
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  }
@@ -148,8 +154,7 @@ fn impl_rust_embed(ast: &syn::DeriveInput) -> Tokens {
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  #[proc_macro_derive(RustEmbed, attributes(folder))]
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  pub fn derive_input_object(input: TokenStream) -> TokenStream {
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- let s = input.to_string();
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- let ast = syn::parse_derive_input(&s).unwrap();
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+ let ast: DeriveInput = syn::parse(input).unwrap();
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  let gen = impl_rust_embed(&ast);
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- gen.parse().unwrap()
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+ gen.into()
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  }