No more syntex for serde_derive

serde_codegen/src/bound.rs

@@ -1,9 +1,6 @@
 use std::collections::HashSet;
 
-use aster::AstBuilder;
-
-use syntax::ast;
-use syntax::visit;
+use syn::{self, aster, visit};
 
 use internals::ast::Item;
 use internals::attr;
@@ -11,10 +8,10 @@ use internals::attr;
 // Remove the default from every type parameter because in the generated impls
 // they look like associated types: "error: associated type bindings are not
 // allowed here".
-pub fn without_defaults(generics: &ast::Generics) -> ast::Generics {
-    ast::Generics {
+pub fn without_defaults(generics: &syn::Generics) -> syn::Generics {
+    syn::Generics {
         ty_params: generics.ty_params.iter().map(|ty_param| {
-            ast::TyParam {
+            syn::TyParam {
                 default: None,
                 .. ty_param.clone()
             }}).collect(),
@@ -23,24 +20,22 @@ pub fn without_defaults(generics: &ast::Generics) -> ast::Generics {
 }
 
 pub fn with_where_predicates(
-    builder: &AstBuilder,
-    generics: &ast::Generics,
-    predicates: &[ast::WherePredicate],
-) -> ast::Generics {
-    builder.from_generics(generics.clone())
+    generics: &syn::Generics,
+    predicates: &[syn::WherePredicate],
+) -> syn::Generics {
+    aster::from_generics(generics.clone())
         .with_predicates(predicates.to_vec())
         .build()
 }
 
 pub fn with_where_predicates_from_fields<F>(
-    builder: &AstBuilder,
     item: &Item,
-    generics: &ast::Generics,
+    generics: &syn::Generics,
     from_field: F,
-) -> ast::Generics
-    where F: Fn(&attr::Field) -> Option<&[ast::WherePredicate]>,
+) -> syn::Generics
+    where F: Fn(&attr::Field) -> Option<&[syn::WherePredicate]>,
 {
-    builder.from_generics(generics.clone())
+    aster::from_generics(generics.clone())
         .with_predicates(
             item.body.all_fields()
                 .flat_map(|field| from_field(&field.attrs))
@@ -60,34 +55,33 @@ pub fn with_where_predicates_from_fields<F>(
 //         c: C,
 //     }
 pub fn with_bound<F>(
-    builder: &AstBuilder,
     item: &Item,
-    generics: &ast::Generics,
+    generics: &syn::Generics,
     filter: F,
-    bound: &ast::Path,
-) -> ast::Generics
+    bound: &syn::Path,
+) -> syn::Generics
     where F: Fn(&attr::Field) -> bool,
 {
     struct FindTyParams {
         // Set of all generic type parameters on the current struct (A, B, C in
         // the example). Initialized up front.
-        all_ty_params: HashSet<ast::Name>,
+        all_ty_params: HashSet<syn::Ident>,
         // Set of generic type parameters used in fields for which filter
         // returns true (A and B in the example). Filled in as the visitor sees
         // them.
-        relevant_ty_params: HashSet<ast::Name>,
+        relevant_ty_params: HashSet<syn::Ident>,
     }
     impl visit::Visitor for FindTyParams {
-        fn visit_path(&mut self, path: &ast::Path, _id: ast::NodeId) {
+        fn visit_path(&mut self, path: &syn::Path) {
             if let Some(seg) = path.segments.last() {
-                if seg.identifier.name.as_str() == "PhantomData" {
+                if seg.ident == "PhantomData" {
                     // Hardcoded exception, because PhantomData<T> implements
                     // Serialize and Deserialize whether or not T implements it.
                     return;
                 }
             }
             if !path.global && path.segments.len() == 1 {
-                let id = path.segments[0].identifier.name;
+                let id = path.segments[0].ident.clone();
                 if self.all_ty_params.contains(&id) {
                     self.relevant_ty_params.insert(id);
                 }
@@ -97,7 +91,7 @@ pub fn with_bound<F>(
     }
 
     let all_ty_params: HashSet<_> = generics.ty_params.iter()
-        .map(|ty_param| ty_param.ident.name)
+        .map(|ty_param| ty_param.ident.clone())
         .collect();
 
     let relevant_tys = item.body.all_fields()
@@ -112,14 +106,14 @@ pub fn with_bound<F>(
         visit::walk_ty(&mut visitor, ty);
     }
 
-    builder.from_generics(generics.clone())
+    aster::from_generics(generics.clone())
         .with_predicates(
             generics.ty_params.iter()
-                .map(|ty_param| ty_param.ident.name)
+                .map(|ty_param| ty_param.ident.clone())
                 .filter(|id| visitor.relevant_ty_params.contains(id))
-                .map(|id| builder.where_predicate()
+                .map(|id| aster::where_predicate()
                     // the type parameter that is being bounded e.g. T
-                    .bound().build(builder.ty().id(id))
+                    .bound().build(aster::ty().id(id))
                     // the bound e.g. Serialize
                     .bound().trait_(bound.clone()).build()
                     .build()))

serde_codegen/src/lib.rs

@@ -2,11 +2,8 @@
 #![cfg_attr(feature = "clippy", feature(plugin))]
 #![cfg_attr(feature = "clippy", allow(too_many_arguments))]
 #![cfg_attr(feature = "clippy", allow(used_underscore_binding))]
-#![cfg_attr(not(feature = "with-syntex"), feature(rustc_private, plugin))]
-#![cfg_attr(not(feature = "with-syntex"), plugin(quasi_macros))]
+#![cfg_attr(feature = "with-libsyntax", feature(rustc_private, plugin))]
 
-extern crate aster;
-extern crate quasi;
 extern crate serde_codegen_internals as internals;
 
 #[cfg(feature = "with-syntex")]
@@ -16,24 +13,25 @@ extern crate syntex;
 #[macro_use]
 extern crate syntex_syntax as syntax;
 
-#[cfg(not(feature = "with-syntex"))]
+#[cfg(feature = "with-libsyntax")]
 #[macro_use]
 extern crate syntax;
 
-#[cfg(not(feature = "with-syntex"))]
+#[cfg(feature = "with-libsyntax")]
 extern crate rustc_plugin;
 
+extern crate syn;
+#[macro_use]
+extern crate quote;
+
 #[cfg(feature = "with-syntex")]
 use std::path::Path;
 
-#[cfg(not(feature = "with-syntex"))]
+#[cfg(feature = "with-libsyntax")]
 use syntax::feature_gate::AttributeType;
 
-#[cfg(feature = "with-syntex")]
-include!(concat!(env!("OUT_DIR"), "/lib.rs"));
-
-#[cfg(not(feature = "with-syntex"))]
-include!("lib.rs.in");
+mod bound;
+mod ser;
 
 #[cfg(feature = "with-syntex")]
 fn syntex_registry() -> syntex::Registry {
@@ -68,7 +66,7 @@ fn syntex_registry() -> syntex::Registry {
     reg.add_attr("feature(custom_derive)");
     reg.add_attr("feature(custom_attribute)");
 
-    reg.add_decorator("derive_Serialize", ser::expand_derive_serialize);
+    reg.add_decorator("derive_Serialize", expand_derive_serialize);
     reg.add_decorator("derive_Deserialize", de::expand_derive_deserialize);
 
     reg.add_post_expansion_pass(strip_attributes);
@@ -102,17 +100,168 @@ pub fn expand<S, D>(src: S, dst: D) -> Result<(), syntex::Error>
     syntex::with_extra_stack(expand_thread)
 }
 
-#[cfg(not(feature = "with-syntex"))]
+#[cfg(feature = "with-libsyntax")]
 pub fn register(reg: &mut rustc_plugin::Registry) {
     reg.register_syntax_extension(
         syntax::parse::token::intern("derive_Serialize"),
         syntax::ext::base::MultiDecorator(
-            Box::new(ser::expand_derive_serialize)));
+            Box::new(expand_derive_serialize)));
 
-    reg.register_syntax_extension(
+    /*reg.register_syntax_extension(
         syntax::parse::token::intern("derive_Deserialize"),
         syntax::ext::base::MultiDecorator(
-            Box::new(de::expand_derive_deserialize)));
+            Box::new(de::expand_derive_deserialize)));*/
 
     reg.register_attribute("serde".to_owned(), AttributeType::Normal);
 }
+
+#[cfg(any(feature = "with-syntex", feature = "with-libsyntax"))]
+use syntax::ast::MetaItem;
+#[cfg(any(feature = "with-syntex", feature = "with-libsyntax"))]
+use syntax::codemap::Span;
+#[cfg(any(feature = "with-syntex", feature = "with-libsyntax"))]
+use syntax::ext::base::{Annotatable, ExtCtxt};
+
+#[cfg(any(feature = "with-syntex", feature = "with-libsyntax"))]
+fn expand_derive_serialize(
+    cx: &mut ExtCtxt,
+    _span: Span,
+    meta_item: &MetaItem,
+    annotatable: &Annotatable,
+    push: &mut FnMut(Annotatable)
+) {
+    let item = match *annotatable {
+        Annotatable::Item(ref item) => item,
+        _ => {
+            cx.span_err(
+                meta_item.span,
+                "`#[derive(Serialize)]` may only be applied to structs and enums");
+            return;
+        }
+    };
+
+    use syntax::print::pprust;
+    let s = pprust::item_to_string(item);
+
+    let syn_item = syn::parse_item(&s).unwrap();
+    let expanded = ser::expand_derive_serialize(&syn_item).to_string();
+
+    use syntax::parse;
+    let name = "Serialize".to_string();
+    let cfg = Vec::new();
+    let sess = parse::ParseSess::new();
+    let impl_item = parse::parse_item_from_source_str(name, expanded, cfg, &sess);
+    push(Annotatable::Item(impl_item.unwrap().unwrap()));
+}
+
+#[cfg(feature = "with-syn")]
+pub fn expand_single_item(item: &str) -> String {
+    let syn_item = syn::parse_item(item).unwrap();
+    let (ser, de, syn_item) = strip_serde_derives(syn_item);
+    let expanded_ser = if ser {
+        Some(ser::expand_derive_serialize(&syn_item))
+    } else {
+        None
+    };
+    let expanded_de = if de {
+        unimplemented!()
+    } else {
+        None::<quote::Tokens>
+    };
+    let syn_item = strip_serde_attrs(syn_item);
+    return quote!(#expanded_ser #expanded_de #syn_item).to_string();
+
+    fn strip_serde_derives(item: syn::Item) -> (bool, bool, syn::Item) {
+        let mut ser = false;
+        let mut de = false;
+        let item = syn::Item {
+            attrs: item.attrs.into_iter().flat_map(|attr| {
+                if attr.is_sugared_doc {
+                    return Some(attr);
+                }
+                let (name, nested) = match attr.value {
+                    syn::MetaItem::List(name, nested) => (name, nested),
+                    _ => return Some(attr)
+                };
+                if name != "derive" {
+                    return Some(syn::Attribute {
+                        value: syn::MetaItem::List(name, nested),
+                        is_sugared_doc: false,
+                    });
+                }
+                let rest: Vec<_> = nested.into_iter().filter(|nested| {
+                    match *nested {
+                        syn::MetaItem::Word(ref word) if word == "Serialize" => {
+                            ser = true;
+                            false
+                        }
+                        syn::MetaItem::Word(ref word) if word == "Deserialize" => {
+                            de = true;
+                            false
+                        }
+                        _ => true,
+                    }
+                }).collect();
+                if rest.is_empty() {
+                    None
+                } else {
+                    Some(syn::Attribute {
+                        value: syn::MetaItem::List(name, rest),
+                        is_sugared_doc: false,
+                    })
+                }
+            }).collect(),
+            ..item
+        };
+        (ser, de, item)
+    }
+
+    fn strip_serde_attrs(item: syn::Item) -> syn::Item {
+        syn::Item {
+            attrs: strip_serde_from_attrs(item.attrs),
+            body: match item.body {
+                syn::Body::Enum(variants) => syn::Body::Enum(
+                    variants.into_iter().map(|variant| {
+                        syn::Variant {
+                            ident: variant.ident,
+                            attrs: strip_serde_from_attrs(variant.attrs),
+                            data: strip_serde_from_variant_data(variant.data),
+                        }
+                    }).collect()
+                ),
+                syn::Body::Struct(variant_data) => syn::Body::Struct(
+                    strip_serde_from_variant_data(variant_data)
+                ),
+            },
+            ..item
+        }
+    }
+
+    fn strip_serde_from_variant_data(data: syn::VariantData) -> syn::VariantData {
+        match data {
+            syn::VariantData::Struct(fields) => syn::VariantData::Struct(
+                fields.into_iter().map(strip_serde_from_field).collect()
+            ),
+            syn::VariantData::Tuple(fields) => syn::VariantData::Tuple(
+                fields.into_iter().map(strip_serde_from_field).collect()
+            ),
+            syn::VariantData::Unit => syn::VariantData::Unit,
+        }
+    }
+
+    fn strip_serde_from_field(field: syn::Field) -> syn::Field {
+        syn::Field {
+            attrs: strip_serde_from_attrs(field.attrs),
+            ..field
+        }
+    }
+
+    fn strip_serde_from_attrs(attrs: Vec<syn::Attribute>) -> Vec<syn::Attribute> {
+        attrs.into_iter().filter(|attr| {
+            match attr.value {
+                syn::MetaItem::List(ref ident, _) => ident != "serde",
+                _ => true,
+            }
+        }).collect()
+    }
+}

serde_codegen/src/lib.rs.in

@@ -1,4 +0,0 @@
-mod bound;
-mod de;
-mod ser;
-mod span;

serde_codegen/src/ser.rs

@@ -1,103 +1,60 @@
-use aster;
-
-use syntax::ast::{self, Ident, MetaItem};
-use syntax::codemap::Span;
-use syntax::ext::base::{Annotatable, ExtCtxt};
-use syntax::ptr::P;
-use syntax::tokenstream::TokenTree;
+use syn::{self, aster};
+use quote::Tokens;
 
 use bound;
-use span;
 use internals::ast::{Body, Field, Item, Style, Variant};
-use internals::{attr, Error};
+use internals::{self, attr};
 
-pub fn expand_derive_serialize(
-    cx: &mut ExtCtxt,
-    span: Span,
-    meta_item: &MetaItem,
-    annotatable: &Annotatable,
-    push: &mut FnMut(Annotatable)
-) {
-    let item = match *annotatable {
-        Annotatable::Item(ref item) => item,
-        _ => {
-            cx.span_err(
-                meta_item.span,
-                "`#[derive(Serialize)]` may only be applied to structs and enums");
-            return;
-        }
-    };
+pub fn expand_derive_serialize(item: &syn::Item) -> Tokens {
+    let item = Item::from_ast(&internals::Ctxt::new(), item);
 
-    let item = match Item::from_ast(cx, item) {
-        Ok(item) => item,
-        Err(Error::UnexpectedItemKind) => {
-            cx.span_err(item.span,
-                "`#[derive(Serialize)]` may only be applied to structs and enums");
-            return;
-        }
-    };
+    let impl_generics = build_impl_generics(&item);
 
-    let builder = aster::AstBuilder::new().span(span);
-
-    let impl_item = serialize_item(cx, &builder, &item);
-    push(span::record_expansion(cx, impl_item, "Serialize"))
-}
-
-fn serialize_item(
-    cx: &ExtCtxt,
-    builder: &aster::AstBuilder,
-    item: &Item,
-) -> P<ast::Item> {
-    let impl_generics = build_impl_generics(builder, &item);
-
-    let ty = builder.ty().path()
-        .segment(item.ident).with_generics(impl_generics.clone()).build()
+    let ty = aster::ty().path()
+        .segment(item.ident.clone()).with_generics(impl_generics.clone()).build()
         .build();
 
-    let body = serialize_body(cx,
-                              builder,
-                              &item,
+    let body = serialize_body(&item,
                               &impl_generics,
                               ty.clone());
 
     let where_clause = &impl_generics.where_clause;
 
-    let dummy_const = builder.id(format!("_IMPL_SERIALIZE_FOR_{}", item.ident));
+    let dummy_const = aster::id(format!("_IMPL_SERIALIZE_FOR_{}", item.ident));
 
-    quote_item!(cx,
+    quote! {
         #[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
-        const $dummy_const: () = {
+        const #dummy_const: () = {
             extern crate serde as _serde;
             #[automatically_derived]
-            impl $impl_generics _serde::ser::Serialize for $ty $where_clause {
+            impl #impl_generics _serde::ser::Serialize for #ty #where_clause {
                 fn serialize<__S>(&self, _serializer: &mut __S) -> ::std::result::Result<(), __S::Error>
                     where __S: _serde::ser::Serializer
-                $body
+                {
+                    #body
+                }
             }
         };
-    ).unwrap()
+    }
 }
 
 // All the generics in the input, plus a bound `T: Serialize` for each generic
 // field type that will be serialized by us.
-fn build_impl_generics(
-    builder: &aster::AstBuilder,
-    item: &Item,
-) -> ast::Generics {
+fn build_impl_generics(item: &Item) -> syn::Generics {
     let generics = bound::without_defaults(item.generics);
 
     let generics = bound::with_where_predicates_from_fields(
-        builder, item, &generics,
+        item, &generics,
         |attrs| attrs.ser_bound());
 
     match item.attrs.ser_bound() {
         Some(predicates) => {
-            bound::with_where_predicates(builder, &generics, predicates)
+            bound::with_where_predicates(&generics, predicates)
         }
         None => {
-            bound::with_bound(builder, item, &generics,
+            bound::with_bound(item, &generics,
                 needs_serialize_bound,
-                &builder.path().ids(&["_serde", "ser", "Serialize"]).build())
+                &aster::path().ids(&["_serde", "ser", "Serialize"]).build())
         }
     }
 }
@@ -113,18 +70,14 @@ fn needs_serialize_bound(attrs: &attr::Field) -> bool {
 }
 
 fn serialize_body(
-    cx: &ExtCtxt,
-    builder: &aster::AstBuilder,
     item: &Item,
-    impl_generics: &ast::Generics,
-    ty: P<ast::Ty>,
-) -> P<ast::Block> {
+    impl_generics: &syn::Generics,
+    ty: syn::Ty,
+) -> Tokens {
     match item.body {
         Body::Enum(ref variants) => {
             serialize_item_enum(
-                cx,
-                builder,
-                item.ident,
+                &item.ident,
                 impl_generics,
                 ty,
                 variants,
@@ -132,12 +85,10 @@ fn serialize_body(
         }
         Body::Struct(Style::Struct, ref fields) => {
             if fields.iter().any(|field| field.ident.is_none()) {
-                cx.span_bug(item.span, "struct has unnamed fields")
+                panic!("struct has unnamed fields");
             }
 
             serialize_struct(
-                cx,
-                builder,
                 impl_generics,
                 ty,
                 fields,
@@ -145,12 +96,10 @@ fn serialize_body(
         }
         Body::Struct(Style::Tuple, ref fields) => {
             if fields.iter().any(|field| field.ident.is_some()) {
-                cx.span_bug(item.span, "tuple struct has named fields")
+                panic!("tuple struct has named fields");
             }
 
             serialize_tuple_struct(
-                cx,
-                builder,
                 impl_generics,
                 ty,
                 fields,
@@ -158,8 +107,6 @@ fn serialize_body(
         }
         Body::Struct(Style::Newtype, ref fields) => {
             serialize_newtype_struct(
-                cx,
-                builder,
                 impl_generics,
                 ty,
                 &fields[0],
@@ -167,136 +114,116 @@ fn serialize_body(
         }
         Body::Struct(Style::Unit, _) => {
             serialize_unit_struct(
-                cx,
-                builder,
                 &item.attrs)
         }
     }
 }
 
-fn serialize_unit_struct(
-    cx: &ExtCtxt,
-    builder: &aster::AstBuilder,
-    item_attrs: &attr::Item,
-) -> P<ast::Block> {
-    let type_name = name_expr(builder, item_attrs.name());
+fn serialize_unit_struct(item_attrs: &attr::Item) -> Tokens {
+    let type_name = item_attrs.name().serialize_name();
 
-    quote_block!(cx, {
-        _serializer.serialize_unit_struct($type_name)
-    }).unwrap()
+    quote! {
+        _serializer.serialize_unit_struct(#type_name)
+    }
 }
 
 fn serialize_newtype_struct(
-    cx: &ExtCtxt,
-    builder: &aster::AstBuilder,
-    impl_generics: &ast::Generics,
-    item_ty: P<ast::Ty>,
+    impl_generics: &syn::Generics,
+    item_ty: syn::Ty,
     field: &Field,
     item_attrs: &attr::Item,
-) -> P<ast::Block> {
-    let type_name = name_expr(builder, item_attrs.name());
+) -> Tokens {
+    let type_name = item_attrs.name().serialize_name();
 
-    let mut field_expr = quote_expr!(cx, &self.0);
+    let mut field_expr = quote!(&self.0);
     if let Some(path) = field.attrs.serialize_with() {
-        field_expr = wrap_serialize_with(cx, builder,
+        field_expr = wrap_serialize_with(
             &item_ty, impl_generics, &field.ty, path, field_expr);
     }
 
-    quote_block!(cx, {
-        _serializer.serialize_newtype_struct($type_name, $field_expr)
-    }).unwrap()
+    quote! {
+        _serializer.serialize_newtype_struct(#type_name, #field_expr)
+    }
 }
 
 fn serialize_tuple_struct(
-    cx: &ExtCtxt,
-    builder: &aster::AstBuilder,
-    impl_generics: &ast::Generics,
-    ty: P<ast::Ty>,
+    impl_generics: &syn::Generics,
+    ty: syn::Ty,
     fields: &[Field],
     item_attrs: &attr::Item,
-) -> P<ast::Block> {
+) -> Tokens {
     let serialize_stmts = serialize_tuple_struct_visitor(
-        cx,
-        builder,
         ty.clone(),
         fields,
         impl_generics,
         false,
-        cx.ident_of("serialize_tuple_struct_elt"),
+        aster::id("serialize_tuple_struct_elt"),
     );
 
-    let type_name = name_expr(builder, item_attrs.name());
+    let type_name = item_attrs.name().serialize_name();
     let len = serialize_stmts.len();
-    let let_mut = mut_if(cx, len > 0);
+    let let_mut = mut_if(len > 0);
 
-    quote_block!(cx, {
-        let $let_mut state = try!(_serializer.serialize_tuple_struct($type_name, $len));
-        $serialize_stmts
+    quote! {
+        let #let_mut state = try!(_serializer.serialize_tuple_struct(#type_name, #len));
+        #(serialize_stmts)*
         _serializer.serialize_tuple_struct_end(state)
-    }).unwrap()
+    }
 }
 
 fn serialize_struct(
-    cx: &ExtCtxt,
-    builder: &aster::AstBuilder,
-    impl_generics: &ast::Generics,
-    ty: P<ast::Ty>,
+    impl_generics: &syn::Generics,
+    ty: syn::Ty,
     fields: &[Field],
     item_attrs: &attr::Item,
-) -> P<ast::Block> {
+) -> Tokens {
     let serialize_fields = serialize_struct_visitor(
-        cx,
-        builder,
         ty.clone(),
         fields,
         impl_generics,
         false,
-        cx.ident_of("serialize_struct_elt"),
+        aster::id("serialize_struct_elt"),
     );
 
-    let type_name = name_expr(builder, item_attrs.name());
+    let type_name = item_attrs.name().serialize_name();
 
     let mut serialized_fields = fields.iter()
         .filter(|&field| !field.attrs.skip_serializing())
         .peekable();
 
-    let let_mut = mut_if(cx, serialized_fields.peek().is_some());
+    let let_mut = mut_if(serialized_fields.peek().is_some());
 
     let len = serialized_fields
         .map(|field| {
-            let ident = field.ident.expect("struct has unnamed fields");
-            let field_expr = quote_expr!(cx, &self.$ident);
+            let ident = field.ident.clone().expect("struct has unnamed fields");
+            let field_expr = quote!(&self.#ident);
 
             match field.attrs.skip_serializing_if() {
-                Some(path) => quote_expr!(cx, if $path($field_expr) { 0 } else { 1 }),
-                None => quote_expr!(cx, 1),
+                Some(path) => quote!(if #path(#field_expr) { 0 } else { 1 }),
+                None => quote!(1),
             }
          })
-        .fold(quote_expr!(cx, 0), |sum, expr| quote_expr!(cx, $sum + $expr));
+        .fold(quote!(0), |sum, expr| quote!(#sum + #expr));
 
-    quote_block!(cx, {
-        let $let_mut state = try!(_serializer.serialize_struct($type_name, $len));
-        $serialize_fields
+    quote! {
+        let #let_mut state = try!(_serializer.serialize_struct(#type_name, #len));
+        #(serialize_fields)*
         _serializer.serialize_struct_end(state)
-    }).unwrap()
+    }
 }
 
 fn serialize_item_enum(
-    cx: &ExtCtxt,
-    builder: &aster::AstBuilder,
-    type_ident: Ident,
-    impl_generics: &ast::Generics,
-    ty: P<ast::Ty>,
+    type_ident: &syn::Ident,
+    impl_generics: &syn::Generics,
+    ty: syn::Ty,
     variants: &[Variant],
     item_attrs: &attr::Item,
-) -> P<ast::Block> {
+) -> Tokens {
     let arms: Vec<_> =
         variants.iter()
             .enumerate()
             .map(|(variant_index, variant)| {
                 serialize_variant(
-                    cx,
-                    builder,
                     type_ident,
                     impl_generics,
                     ty.clone(),
@@ -307,44 +234,40 @@ fn serialize_item_enum(
             })
             .collect();
 
-    quote_block!(cx, {
+    quote! {
         match *self {
-            $arms
+            #(arms)*
         }
-    }).unwrap()
+    }
 }
 
 fn serialize_variant(
-    cx: &ExtCtxt,
-    builder: &aster::AstBuilder,
-    type_ident: Ident,
-    generics: &ast::Generics,
-    ty: P<ast::Ty>,
+    type_ident: &syn::Ident,
+    generics: &syn::Generics,
+    ty: syn::Ty,
     variant: &Variant,
     variant_index: usize,
     item_attrs: &attr::Item,
-) -> ast::Arm {
-    let type_name = name_expr(builder, item_attrs.name());
+) -> Tokens {
+    let type_name = item_attrs.name().serialize_name();
 
-    let variant_ident = variant.ident;
-    let variant_name = name_expr(builder, variant.attrs.name());
+    let variant_ident = variant.ident.clone();
+    let variant_name = variant.attrs.name().serialize_name();
 
     match variant.style {
         Style::Unit => {
-            quote_arm!(cx,
-                $type_ident::$variant_ident =>
+            quote! {
+                #type_ident::#variant_ident =>
                     _serde::ser::Serializer::serialize_unit_variant(
                         _serializer,
-                        $type_name,
-                        $variant_index,
-                        $variant_name,
+                        #type_name,
+                        #variant_index,
+                        #variant_name,
                     ),
-            )
+            }
         },
         Style::Newtype => {
             let block = serialize_newtype_variant(
-                cx,
-                builder,
                 type_name,
                 variant_index,
                 variant_name,
@@ -353,26 +276,21 @@ fn serialize_variant(
                 &variant.fields[0],
             );
 
-            quote_arm!(cx,
-                $type_ident::$variant_ident(ref __simple_value) => $block
-            )
+            quote! {
+                #type_ident::#variant_ident(ref __simple_value) => #block,
+            }
         },
         Style::Tuple => {
-            let field_names: Vec<ast::Ident> = (0 .. variant.fields.len())
-                .map(|i| builder.id(format!("__field{}", i)))
+            let field_names: Vec<Tokens> = (0 .. variant.fields.len())
+                .map(|i| {
+                    let id = aster::id(format!("__field{}", i));
+                    quote!(ref #id)
+                })
                 .collect();
 
-            let pat = builder.pat().enum_()
-                .id(type_ident).id(variant_ident).build()
-                .with_pats(
-                    field_names.iter()
-                        .map(|field| builder.pat().ref_id(field))
-                )
-                .build();
+            let pat = quote!(#type_ident::#variant_ident(#(field_names),*));
 
             let block = serialize_tuple_variant(
-                cx,
-                builder,
                 type_name,
                 variant_index,
                 variant_name,
@@ -381,28 +299,21 @@ fn serialize_variant(
                 &variant.fields,
             );
 
-            quote_arm!(cx,
-                $pat => $block
-            )
+            quote! {
+                #pat => { #block }
+            }
         }
         Style::Struct => {
-            let mut pat = builder.pat().struct_().id(type_ident).id(variant_ident).build();
-            for field in &variant.fields {
-                let name = match field.ident {
-                    Some(name) => name,
-                    None => cx.span_bug(field.span, "struct variant has unnamed fields"),
+            let fields = variant.fields.iter().map(|field| {
+                let id = match field.ident {
+                    Some(ref name) => name.clone(),
+                    None => panic!("struct variant has unnamed fields"),
                 };
-                pat = pat.with_field_pat(ast::FieldPat {
-                    ident: name,
-                    pat: builder.pat().ref_id(name),
-                    is_shorthand: true,
-                });
-            }
-            let pat = pat.build();
+                quote!(ref #id)
+            });
+            let pat = quote!(#type_ident::#variant_ident { #(fields),* });
 
             let block = serialize_struct_variant(
-                cx,
-                builder,
                 variant_index,
                 variant_name,
                 generics,
@@ -411,250 +322,228 @@ fn serialize_variant(
                 item_attrs,
             );
 
-            quote_arm!(cx,
-                $pat => $block
-            )
+            quote! {
+                #pat => { #block }
+            }
         }
     }
 }
 
 fn serialize_newtype_variant(
-    cx: &ExtCtxt,
-    builder: &aster::AstBuilder,
-    type_name: P<ast::Expr>,
+    type_name: String,
     variant_index: usize,
-    variant_name: P<ast::Expr>,
-    item_ty: P<ast::Ty>,
-    generics: &ast::Generics,
+    variant_name: String,
+    item_ty: syn::Ty,
+    generics: &syn::Generics,
     field: &Field,
-) -> P<ast::Block> {
-    let mut field_expr = quote_expr!(cx, __simple_value);
+) -> Tokens {
+    let mut field_expr = quote!(__simple_value);
     if let Some(path) = field.attrs.serialize_with() {
-        field_expr = wrap_serialize_with(cx, builder,
+        field_expr = wrap_serialize_with(
             &item_ty, generics, &field.ty, path, field_expr);
     }
 
-    quote_block!(cx, {
+    quote! {
         _serde::ser::Serializer::serialize_newtype_variant(
             _serializer,
-            $type_name,
-            $variant_index,
-            $variant_name,
-            $field_expr,
+            #type_name,
+            #variant_index,
+            #variant_name,
+            #field_expr,
         )
-    }).unwrap()
+    }
 }
 
 fn serialize_tuple_variant(
-    cx: &ExtCtxt,
-    builder: &aster::AstBuilder,
-    type_name: P<ast::Expr>,
+    type_name: String,
     variant_index: usize,
-    variant_name: P<ast::Expr>,
-    generics: &ast::Generics,
-    structure_ty: P<ast::Ty>,
+    variant_name: String,
+    generics: &syn::Generics,
+    structure_ty: syn::Ty,
     fields: &[Field],
-) -> P<ast::Block> {
+) -> Tokens {
     let serialize_stmts = serialize_tuple_struct_visitor(
-        cx,
-        builder,
         structure_ty,
         fields,
         generics,
         true,
-        cx.ident_of("serialize_tuple_variant_elt"),
+        aster::id("serialize_tuple_variant_elt"),
     );
 
     let len = serialize_stmts.len();
-    let let_mut = mut_if(cx, len > 0);
+    let let_mut = mut_if(len > 0);
 
-    quote_block!(cx, {
-        let $let_mut state = try!(_serializer.serialize_tuple_variant($type_name, $variant_index, $variant_name, $len));
-        $serialize_stmts
+    quote! {
+        let #let_mut state = try!(_serializer.serialize_tuple_variant(#type_name, #variant_index, #variant_name, #len));
+        #(serialize_stmts)*
         _serializer.serialize_tuple_variant_end(state)
-    }).unwrap()
+    }
 }
 
 fn serialize_struct_variant(
-    cx: &ExtCtxt,
-    builder: &aster::AstBuilder,
     variant_index: usize,
-    variant_name: P<ast::Expr>,
-    generics: &ast::Generics,
-    ty: P<ast::Ty>,
+    variant_name: String,
+    generics: &syn::Generics,
+    ty: syn::Ty,
     fields: &[Field],
     item_attrs: &attr::Item,
-) -> P<ast::Block> {
-
+) -> Tokens {
     let serialize_fields = serialize_struct_visitor(
-        cx,
-        builder,
         ty.clone(),
         fields,
         &generics,
         true,
-        cx.ident_of("serialize_struct_variant_elt"),
+        aster::id("serialize_struct_variant_elt"),
     );
 
-    let item_name = name_expr(builder, item_attrs.name());
+    let item_name = item_attrs.name().serialize_name();
 
     let mut serialized_fields = fields.iter()
         .filter(|&field| !field.attrs.skip_serializing())
         .peekable();
 
-    let let_mut = mut_if(cx, serialized_fields.peek().is_some());
+    let let_mut = mut_if(serialized_fields.peek().is_some());
 
     let len = serialized_fields
         .map(|field| {
-            let ident = field.ident.expect("struct has unnamed fields");
-            let field_expr = quote_expr!(cx, $ident);
+            let ident = field.ident.clone().expect("struct has unnamed fields");
 
             match field.attrs.skip_serializing_if() {
-                Some(path) => quote_expr!(cx, if $path($field_expr) { 0 } else { 1 }),
-                None => quote_expr!(cx, 1),
+                Some(path) => quote!(if #path(#ident) { 0 } else { 1 }),
+                None => quote!(1),
             }
          })
-        .fold(quote_expr!(cx, 0), |sum, expr| quote_expr!(cx, $sum + $expr));
+        .fold(quote!(0), |sum, expr| quote!(#sum + #expr));
 
-    quote_block!(cx, {
-        let $let_mut state = try!(_serializer.serialize_struct_variant(
-            $item_name,
-            $variant_index,
-            $variant_name,
-            $len,
+    quote! {
+        let #let_mut state = try!(_serializer.serialize_struct_variant(
+            #item_name,
+            #variant_index,
+            #variant_name,
+            #len,
         ));
-        $serialize_fields
+        #(serialize_fields)*
         _serializer.serialize_struct_variant_end(state)
-    }).unwrap()
+    }
 }
 
 fn serialize_tuple_struct_visitor(
-    cx: &ExtCtxt,
-    builder: &aster::AstBuilder,
-    structure_ty: P<ast::Ty>,
+    structure_ty: syn::Ty,
     fields: &[Field],
-    generics: &ast::Generics,
+    generics: &syn::Generics,
     is_enum: bool,
-    func: ast::Ident,
-) -> Vec<ast::Stmt> {
+    func: syn::Ident,
+) -> Vec<Tokens> {
     fields.iter()
         .enumerate()
         .map(|(i, field)| {
             let mut field_expr = if is_enum {
-                builder.expr().path().id(format!("__field{}", i)).build()
+                let id = aster::id(format!("__field{}", i));
+                quote!(#id)
             } else {
-                builder.expr().ref_().tup_field(i).self_()
+                quote!(&self.#i)
             };
 
             let skip = field.attrs.skip_serializing_if()
-                .map(|path| quote_expr!(cx, $path($field_expr)));
+                .map(|path| quote!(#path(#field_expr)));
 
             if let Some(path) = field.attrs.serialize_with() {
-                field_expr = wrap_serialize_with(cx, builder,
+                field_expr = wrap_serialize_with(
                     &structure_ty, generics, &field.ty, path, field_expr);
             }
 
-            let ser = quote_expr!(cx,
-                try!(_serializer.$func(&mut state, $field_expr));
-            );
+            let ser = quote! {
+                try!(_serializer.#func(&mut state, #field_expr));
+            };
 
             match skip {
-                None => quote_stmt!(cx, $ser).unwrap(),
-                Some(skip) => quote_stmt!(cx, if !$skip { $ser }).unwrap(),
+                None => ser,
+                Some(skip) => quote!(if !#skip { #ser }),
             }
         })
         .collect()
 }
 
 fn serialize_struct_visitor(
-    cx: &ExtCtxt,
-    builder: &aster::AstBuilder,
-    structure_ty: P<ast::Ty>,
+    structure_ty: syn::Ty,
     fields: &[Field],
-    generics: &ast::Generics,
+    generics: &syn::Generics,
     is_enum: bool,
-    func: ast::Ident,
-) -> Vec<ast::Stmt> {
+    func: syn::Ident,
+) -> Vec<Tokens> {
     fields.iter()
         .filter(|&field| !field.attrs.skip_serializing())
         .map(|field| {
-            let ident = field.ident.expect("struct has unnamed field");
+            let ident = field.ident.clone().expect("struct has unnamed field");
             let mut field_expr = if is_enum {
-                quote_expr!(cx, $ident)
+                quote!(#ident)
             } else {
-                quote_expr!(cx, &self.$ident)
+                quote!(&self.#ident)
             };
 
-            let key_expr = name_expr(builder, field.attrs.name());
+            let key_expr = field.attrs.name().serialize_name();
 
             let skip = field.attrs.skip_serializing_if()
-                .map(|path| quote_expr!(cx, $path($field_expr)));
+                .map(|path| quote!(#path(#field_expr)));
 
             if let Some(path) = field.attrs.serialize_with() {
-                field_expr = wrap_serialize_with(cx, builder,
+                field_expr = wrap_serialize_with(
                     &structure_ty, generics, &field.ty, path, field_expr)
             }
 
-            let ser = quote_expr!(cx,
-                try!(_serializer.$func(&mut state, $key_expr, $field_expr));
-            );
+            let ser = quote! {
+                try!(_serializer.#func(&mut state, #key_expr, #field_expr));
+            };
 
             match skip {
-                None => quote_stmt!(cx, $ser).unwrap(),
-                Some(skip) => quote_stmt!(cx, if !$skip { $ser }).unwrap(),
+                None => ser,
+                Some(skip) => quote!(if !#skip { #ser }),
             }
         })
         .collect()
 }
 
 fn wrap_serialize_with(
-    cx: &ExtCtxt,
-    builder: &aster::AstBuilder,
-    item_ty: &P<ast::Ty>,
-    generics: &ast::Generics,
-    field_ty: &P<ast::Ty>,
-    path: &ast::Path,
-    value: P<ast::Expr>,
-) -> P<ast::Expr> {
+    item_ty: &syn::Ty,
+    generics: &syn::Generics,
+    field_ty: &syn::Ty,
+    path: &syn::Path,
+    value: Tokens,
+) -> Tokens {
     let where_clause = &generics.where_clause;
 
-    let wrapper_generics = builder.from_generics(generics.clone())
+    let wrapper_generics = aster::from_generics(generics.clone())
         .add_lifetime_bound("'__a")
         .lifetime_name("'__a")
         .build();
 
-    let wrapper_ty = builder.path()
+    let wrapper_ty = aster::path()
         .segment("__SerializeWith")
             .with_generics(wrapper_generics.clone())
             .build()
         .build();
 
-    quote_expr!(cx, {
-        struct __SerializeWith $wrapper_generics $where_clause {
-            value: &'__a $field_ty,
-            phantom: ::std::marker::PhantomData<$item_ty>,
-        }
+    quote! {
+        {
+            struct __SerializeWith #wrapper_generics #where_clause {
+                value: &'__a #field_ty,
+                phantom: ::std::marker::PhantomData<#item_ty>,
+            }
 
-        impl $wrapper_generics _serde::ser::Serialize for $wrapper_ty $where_clause {
-            fn serialize<__S>(&self, __s: &mut __S) -> ::std::result::Result<(), __S::Error>
-                where __S: _serde::ser::Serializer
-            {
-                $path(self.value, __s)
+            impl #wrapper_generics _serde::ser::Serialize for #wrapper_ty #where_clause {
+                fn serialize<__S>(&self, __s: &mut __S) -> ::std::result::Result<(), __S::Error>
+                    where __S: _serde::ser::Serializer
+                {
+                    #path(self.value, __s)
+                }
+            }
+
+            __SerializeWith {
+                value: #value,
+                phantom: ::std::marker::PhantomData::<#item_ty>,
             }
         }
-
-        __SerializeWith {
-            value: $value,
-            phantom: ::std::marker::PhantomData::<$item_ty>,
-        }
-    })
-}
-
-fn name_expr(
-    builder: &aster::AstBuilder,
-    name: &attr::Name,
-) -> P<ast::Expr> {
-    builder.expr().str(name.serialize_name())
+    }
 }
 
 // Serialization of an empty struct results in code like:
@@ -663,10 +552,10 @@ fn name_expr(
 //     serializer.serialize_struct_end(state)
 //
 // where we want to omit the `mut` to avoid a warning.
-fn mut_if(cx: &ExtCtxt, is_mut: bool) -> Vec<TokenTree> {
+fn mut_if(is_mut: bool) -> Option<Tokens> {
     if is_mut {
-        quote_tokens!(cx, mut)
+        Some(quote!(mut))
     } else {
-        Vec::new()
+        None
     }
 }

serde_codegen/src/span.rs

@@ -1,43 +0,0 @@
-use syntax::ast;
-use syntax::codemap::{self, ExpnId, Span};
-use syntax::ext::base::{Annotatable, ExtCtxt};
-use syntax::fold::{self, Folder};
-use syntax::parse::token::intern;
-use syntax::ptr::P;
-
-pub fn record_expansion(
-    cx: &ExtCtxt,
-    item: P<ast::Item>,
-    derive: &str,
-) -> Annotatable {
-    let info = codemap::ExpnInfo {
-        call_site: codemap::DUMMY_SP,
-        callee: codemap::NameAndSpan {
-            format: codemap::MacroAttribute(intern(&format!("derive({})", derive))),
-            span: None,
-            allow_internal_unstable: false,
-        },
-    };
-    let expn_id = cx.codemap().record_expansion(info);
-
-    let mut respanner = Respanner { expn_id: expn_id };
-    let item = item.map(|item| respanner.fold_item_simple(item));
-    Annotatable::Item(item)
-}
-
-struct Respanner {
-    expn_id: ExpnId,
-}
-
-impl Folder for Respanner {
-    fn new_span(&mut self, span: Span) -> Span {
-        Span {
-            expn_id: self.expn_id,
-            .. span
-        }
-    }
-
-    fn fold_mac(&mut self, mac: ast::Mac) -> ast::Mac {
-        fold::noop_fold_mac(mac, self)
-    }
-}