mirror of
https://github.com/pezkuwichain/serde.git
synced 2026-04-27 14:37:55 +00:00
Split serde_macros into multiple files
This commit is contained in:
Erick Tryzelaar
@@ -0,0 +1,900 @@
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use syntax::ast::{
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Ident,
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MetaItem,
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MetaItem_,
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Item,
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Expr,
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MutMutable,
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StructDef,
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EnumDef,
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};
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use syntax::ast;
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use syntax::codemap::{Span, respan};
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use syntax::ext::base::{ExtCtxt, ItemDecorator};
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use syntax::ext::build::AstBuilder;
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use syntax::ext::deriving::generic::{
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MethodDef,
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Named,
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StaticFields,
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StaticStruct,
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StaticEnum,
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Substructure,
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TraitDef,
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Unnamed,
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combine_substructure,
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};
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use syntax::ext::deriving::generic::ty::{
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Borrowed,
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LifetimeBounds,
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Ty,
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Path,
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};
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use syntax::parse::token;
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use syntax::ptr::P;
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use aster;
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use field::field_alias;
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pub fn expand_derive_deserialize(
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cx: &mut ExtCtxt,
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sp: Span,
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mitem: &MetaItem,
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item: &Item,
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push: &mut FnMut(P<ast::Item>)
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) {
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let inline = cx.meta_word(sp, token::InternedString::new("inline"));
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let attrs = vec!(cx.attribute(sp, inline));
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let trait_def = TraitDef {
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span: sp,
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attributes: Vec::new(),
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path: Path::new(vec!["serde", "de", "Deserialize"]),
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additional_bounds: Vec::new(),
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generics: LifetimeBounds::empty(),
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associated_types: vec![],
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methods: vec!(
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MethodDef {
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name: "deserialize",
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generics: LifetimeBounds {
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lifetimes: Vec::new(),
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bounds: vec![
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("__D", vec![Path::new(vec!["serde", "de", "Deserializer"])]),
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],
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},
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explicit_self: None,
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args: vec![
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Ty::Ptr(
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Box::new(Ty::Literal(Path::new_local("__D"))),
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Borrowed(None, MutMutable)
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),
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],
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ret_ty: Ty::Literal(
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Path::new_(
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vec!["std", "result", "Result"],
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None,
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vec![
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Box::new(Ty::Self_),
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Box::new(Ty::Literal(Path::new_(vec!["__D", "Error"],
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None,
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vec![],
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false))),
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],
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true
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)
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),
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attributes: attrs,
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combine_substructure: combine_substructure(Box::new(|a, b, c| {
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deserialize_substructure(a, b, c, item)
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})),
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})
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};
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trait_def.expand(cx, mitem, item, |item| push(item))
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}
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fn deserialize_substructure(
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cx: &ExtCtxt,
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span: Span,
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substr: &Substructure,
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item: &Item,
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) -> P<Expr> {
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let builder = aster::AstBuilder::new().span(span);
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let state = substr.nonself_args[0].clone();
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let generics = match item.node {
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ast::ItemStruct(_, ref generics) => generics,
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ast::ItemEnum(_, ref generics) => generics,
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_ => cx.bug("expected ItemStruct or ItemEnum in derive(Deserialize)")
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};
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let trait_generics = builder.from_generics(generics.clone())
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.add_ty_param_bound(
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builder.path().global().ids(&["serde", "de", "Deserialize"]).build()
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)
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.build();
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let type_generics = builder.from_generics(trait_generics.clone())
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.strip_bounds()
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.build();
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let visitor_ty = builder.ty().path()
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.segment("__Visitor").with_generics(trait_generics.clone()).build()
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.build();
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// Build `__Visitor<A, B, ...>(PhantomData<A>, PhantomData<B>, ...)`
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let (visitor_item, visitor_expr) = deserialize_visitor(
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&builder,
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&trait_generics
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);
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let value_ty = builder.ty().path()
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.segment(substr.type_ident).with_generics(trait_generics.clone()).build()
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.build();
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match *substr.fields {
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StaticStruct(ref struct_def, ref fields) => {
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deserialize_struct(
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cx,
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span,
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&builder,
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substr.type_ident,
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substr.type_ident,
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builder.path().id(substr.type_ident).build(),
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fields,
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state,
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struct_def,
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&trait_generics,
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visitor_item,
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visitor_ty,
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visitor_expr,
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value_ty,
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)
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}
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StaticEnum(ref enum_def, ref fields) => {
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deserialize_enum(
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cx,
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&builder,
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substr.type_ident,
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&fields,
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state,
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enum_def,
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&trait_generics,
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&type_generics,
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value_ty,
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)
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}
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_ => cx.bug("expected StaticEnum or StaticStruct in derive(Deserialize)")
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}
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}
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// Build `__Visitor<A, B, ...>(PhantomData<A>, PhantomData<B>, ...)`
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fn deserialize_visitor(
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builder: &aster::AstBuilder,
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trait_generics: &ast::Generics,
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) -> (P<ast::Item>, P<ast::Expr>) {
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if trait_generics.ty_params.is_empty() {
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(
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builder.item().tuple_struct("__Visitor")
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.build(),
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builder.expr().id("__Visitor"),
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)
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} else {
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(
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builder.item().tuple_struct("__Visitor")
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.generics().with(trait_generics.clone()).build()
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.with_tys(
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trait_generics.ty_params.iter().map(|ty_param| {
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builder.ty().phantom_data().id(ty_param.ident)
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})
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)
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.build(),
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builder.expr().call().id("__Visitor")
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.with_args(
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trait_generics.ty_params.iter().map(|_| {
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builder.expr().phantom_data()
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})
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)
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.build(),
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)
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}
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}
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fn deserialize_struct(
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cx: &ExtCtxt,
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span: Span,
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builder: &aster::AstBuilder,
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type_ident: Ident,
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struct_ident: Ident,
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struct_path: ast::Path,
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fields: &StaticFields,
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state: P<ast::Expr>,
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struct_def: &StructDef,
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trait_generics: &ast::Generics,
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visitor_item: P<ast::Item>,
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visitor_ty: P<ast::Ty>,
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visitor_expr: P<ast::Expr>,
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value_ty: P<ast::Ty>,
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) -> P<ast::Expr> {
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match *fields {
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Unnamed(ref fields) => {
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if fields.is_empty() {
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deserialize_struct_empty_fields(
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cx,
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builder,
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type_ident,
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struct_ident,
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struct_path,
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state)
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} else {
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deserialize_struct_unnamed_fields(
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cx,
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builder,
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struct_ident,
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struct_path,
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&fields,
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state,
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trait_generics,
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visitor_item,
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visitor_ty,
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visitor_expr,
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value_ty,
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)
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}
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}
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Named(ref fields) => {
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deserialize_struct_named_fields(
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cx,
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span,
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builder,
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struct_ident,
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struct_path,
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&fields,
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state,
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struct_def,
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trait_generics,
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visitor_item,
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visitor_ty,
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visitor_expr,
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value_ty,
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)
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}
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}
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}
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fn deserialize_struct_empty_fields(
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cx: &ExtCtxt,
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builder: &aster::AstBuilder,
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type_ident: Ident,
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struct_ident: Ident,
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struct_path: ast::Path,
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state: P<ast::Expr>,
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) -> P<ast::Expr> {
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let struct_name = builder.expr().str(struct_ident);
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let result = builder.expr().build_path(struct_path);
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quote_expr!(cx, {
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struct __Visitor;
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impl ::serde::de::Visitor for __Visitor {
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type Value = $type_ident;
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#[inline]
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fn visit_unit<E>(&mut self) -> Result<$type_ident, E>
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where E: ::serde::de::Error,
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{
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Ok($result)
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}
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#[inline]
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fn visit_named_unit<
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E: ::serde::de::Error,
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>(&mut self, name: &str) -> Result<$type_ident, E> {
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if name == $struct_name {
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self.visit_unit()
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} else {
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Err(::serde::de::Error::syntax_error())
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}
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}
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#[inline]
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fn visit_seq<V>(&mut self, mut visitor: V) -> Result<$type_ident, V::Error>
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where V: ::serde::de::SeqVisitor,
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{
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try!(visitor.end());
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self.visit_unit()
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}
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}
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$state.visit(__Visitor)
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})
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}
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fn deserialize_struct_unnamed_fields(
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cx: &ExtCtxt,
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builder: &aster::AstBuilder,
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struct_ident: Ident,
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struct_path: ast::Path,
|
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fields: &[Span],
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state: P<ast::Expr>,
|
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trait_generics: &ast::Generics,
|
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visitor_item: P<ast::Item>,
|
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visitor_ty: P<ast::Ty>,
|
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visitor_expr: P<ast::Expr>,
|
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value_ty: P<ast::Ty>,
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) -> P<ast::Expr> {
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let where_clause = &trait_generics.where_clause;
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let field_names: Vec<ast::Ident> = (0 .. fields.len())
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.map(|i| builder.id(&format!("__field{}", i)))
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.collect();
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|
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let visit_seq_expr = declare_visit_seq(
|
||||
cx,
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builder,
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||||
struct_path,
|
||||
&field_names,
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||||
);
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|
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let struct_name = builder.expr().str(struct_ident);
|
||||
|
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quote_expr!(cx, {
|
||||
$visitor_item
|
||||
|
||||
impl $trait_generics ::serde::de::Visitor for $visitor_ty $where_clause {
|
||||
type Value = $value_ty;
|
||||
|
||||
fn visit_seq<__V>(&mut self, mut visitor: __V) -> Result<$value_ty, __V::Error>
|
||||
where __V: ::serde::de::SeqVisitor,
|
||||
{
|
||||
$visit_seq_expr
|
||||
}
|
||||
|
||||
fn visit_named_seq<__V>(&mut self,
|
||||
name: &str,
|
||||
visitor: __V) -> Result<$value_ty, __V::Error>
|
||||
where __V: ::serde::de::SeqVisitor,
|
||||
{
|
||||
if name == $struct_name {
|
||||
self.visit_seq(visitor)
|
||||
} else {
|
||||
Err(::serde::de::Error::syntax_error())
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
$state.visit($visitor_expr)
|
||||
})
|
||||
}
|
||||
|
||||
fn declare_visit_seq(
|
||||
cx: &ExtCtxt,
|
||||
builder: &aster::AstBuilder,
|
||||
struct_path: ast::Path,
|
||||
field_names: &[Ident],
|
||||
) -> P<ast::Expr> {
|
||||
let let_values: Vec<P<ast::Stmt>> = field_names.iter()
|
||||
.map(|name| {
|
||||
quote_stmt!(cx,
|
||||
let $name = match try!(visitor.visit()) {
|
||||
Some(value) => value,
|
||||
None => {
|
||||
return Err(::serde::de::Error::end_of_stream_error());
|
||||
}
|
||||
};
|
||||
)
|
||||
})
|
||||
.collect();
|
||||
|
||||
let result = builder.expr().call()
|
||||
.build_path(struct_path)
|
||||
.with_args(field_names.iter().map(|name| builder.expr().id(*name)))
|
||||
.build();
|
||||
|
||||
quote_expr!(cx, {
|
||||
$let_values
|
||||
|
||||
try!(visitor.end());
|
||||
|
||||
Ok($result)
|
||||
})
|
||||
}
|
||||
|
||||
fn deserialize_struct_named_fields(
|
||||
cx: &ExtCtxt,
|
||||
span: Span,
|
||||
builder: &aster::AstBuilder,
|
||||
struct_ident: Ident,
|
||||
struct_path: ast::Path,
|
||||
fields: &[(Ident, Span)],
|
||||
state: P<ast::Expr>,
|
||||
struct_def: &StructDef,
|
||||
trait_generics: &ast::Generics,
|
||||
visitor_item: P<ast::Item>,
|
||||
visitor_ty: P<ast::Ty>,
|
||||
visitor_expr: P<ast::Expr>,
|
||||
value_ty: P<ast::Ty>,
|
||||
) -> P<ast::Expr> {
|
||||
let where_clause = &trait_generics.where_clause;
|
||||
|
||||
// Create the field names for the fields.
|
||||
let field_names: Vec<ast::Ident> = (0 .. fields.len())
|
||||
.map(|i| token::str_to_ident(&format!("__field{}", i)))
|
||||
.collect();
|
||||
|
||||
let field_devisitor = declare_map_field_devisitor(
|
||||
cx,
|
||||
span,
|
||||
builder,
|
||||
&field_names,
|
||||
fields,
|
||||
struct_def,
|
||||
);
|
||||
|
||||
let visit_map_expr = declare_visit_map(
|
||||
cx,
|
||||
builder,
|
||||
struct_path,
|
||||
&field_names,
|
||||
fields,
|
||||
struct_def
|
||||
);
|
||||
|
||||
let struct_name = builder.expr().str(struct_ident);
|
||||
|
||||
quote_expr!(cx, {
|
||||
$field_devisitor
|
||||
|
||||
$visitor_item
|
||||
|
||||
impl $trait_generics ::serde::de::Visitor for $visitor_ty $where_clause {
|
||||
type Value = $value_ty;
|
||||
|
||||
#[inline]
|
||||
fn visit_map<__V>(&mut self, mut visitor: __V) -> Result<$value_ty, __V::Error>
|
||||
where __V: ::serde::de::MapVisitor,
|
||||
{
|
||||
$visit_map_expr
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn visit_named_map<__V>(&mut self,
|
||||
name: &str,
|
||||
visitor: __V) -> Result<$value_ty, __V::Error>
|
||||
where __V: ::serde::de::MapVisitor,
|
||||
{
|
||||
if name == $struct_name {
|
||||
self.visit_map(visitor)
|
||||
} else {
|
||||
Err(::serde::de::Error::syntax_error())
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
$state.visit($visitor_expr)
|
||||
})
|
||||
}
|
||||
|
||||
fn declare_map_field_devisitor(
|
||||
cx: &ExtCtxt,
|
||||
span: Span,
|
||||
_builder: &aster::AstBuilder,
|
||||
field_names: &[ast::Ident],
|
||||
fields: &[(Ident, Span)],
|
||||
struct_def: &StructDef,
|
||||
) -> Vec<P<ast::Item>> {
|
||||
// Create the field names for the fields.
|
||||
let field_variants: Vec<P<ast::Variant>> = field_names.iter()
|
||||
.map(|field| {
|
||||
P(respan(
|
||||
span,
|
||||
ast::Variant_ {
|
||||
name: *field,
|
||||
attrs: Vec::new(),
|
||||
kind: ast::TupleVariantKind(Vec::new()),
|
||||
id: ast::DUMMY_NODE_ID,
|
||||
disr_expr: None,
|
||||
vis: ast::Inherited,
|
||||
}))
|
||||
})
|
||||
.collect();
|
||||
|
||||
let field_enum = cx.item_enum(
|
||||
span,
|
||||
token::str_to_ident("__Field"),
|
||||
ast::EnumDef { variants: field_variants });
|
||||
|
||||
// Get aliases
|
||||
let aliases: Vec<Option<&ast::Lit>> = struct_def.fields.iter()
|
||||
.map(field_alias)
|
||||
.collect();
|
||||
|
||||
// Match arms to extract a field from a string
|
||||
let field_arms: Vec<ast::Arm> = fields.iter()
|
||||
.zip(field_names.iter())
|
||||
.zip(aliases.iter())
|
||||
.map(|((&(name, span), field), alias_lit)| {
|
||||
let s = match alias_lit {
|
||||
&None => cx.expr_str(span, token::get_ident(name)) ,
|
||||
&Some(lit) =>{
|
||||
let lit = (*lit).clone();
|
||||
cx.expr_lit(lit.span, lit.node)
|
||||
},
|
||||
};
|
||||
quote_arm!(cx, $s => Ok(__Field::$field),)})
|
||||
.collect();
|
||||
|
||||
vec![
|
||||
quote_item!(cx,
|
||||
#[allow(non_camel_case_types)]
|
||||
$field_enum
|
||||
).unwrap(),
|
||||
|
||||
quote_item!(cx,
|
||||
struct __FieldVisitor;
|
||||
).unwrap(),
|
||||
|
||||
quote_item!(cx,
|
||||
impl ::serde::de::Visitor for __FieldVisitor {
|
||||
type Value = __Field;
|
||||
|
||||
fn visit_str<E>(&mut self, value: &str) -> Result<__Field, E>
|
||||
where E: ::serde::de::Error,
|
||||
{
|
||||
match value {
|
||||
$field_arms
|
||||
_ => Err(::serde::de::Error::syntax_error()),
|
||||
}
|
||||
}
|
||||
}
|
||||
).unwrap(),
|
||||
|
||||
quote_item!(cx,
|
||||
impl ::serde::de::Deserialize for __Field {
|
||||
#[inline]
|
||||
fn deserialize<S>(state: &mut S) -> Result<__Field, S::Error>
|
||||
where S: ::serde::de::Deserializer,
|
||||
{
|
||||
state.visit(__FieldVisitor)
|
||||
}
|
||||
}
|
||||
).unwrap(),
|
||||
]
|
||||
}
|
||||
|
||||
|
||||
fn default_value(field: &ast::StructField) -> bool {
|
||||
field.node.attrs.iter()
|
||||
.any(|sa|
|
||||
if let MetaItem_::MetaList(ref n, ref vals) = sa.node.value.node {
|
||||
if n == &"serde" {
|
||||
vals.iter()
|
||||
.map(|mi|
|
||||
if let MetaItem_::MetaWord(ref n) = mi.node {
|
||||
n == &"default"
|
||||
} else {
|
||||
false
|
||||
})
|
||||
.any(|x| x)
|
||||
} else {
|
||||
false
|
||||
}
|
||||
}
|
||||
else {
|
||||
false
|
||||
})
|
||||
}
|
||||
|
||||
fn declare_visit_map(
|
||||
cx: &ExtCtxt,
|
||||
builder: &aster::AstBuilder,
|
||||
struct_path: ast::Path,
|
||||
field_names: &[Ident],
|
||||
fields: &[(Ident, Span)],
|
||||
struct_def: &StructDef,
|
||||
) -> P<ast::Expr> {
|
||||
// Declare each field.
|
||||
let let_values: Vec<P<ast::Stmt>> = field_names.iter()
|
||||
.zip(struct_def.fields.iter())
|
||||
.map(|(field, sf)| {
|
||||
if default_value(sf) {
|
||||
quote_stmt!(
|
||||
cx,
|
||||
let mut $field = Some(::std::default::Default::default());)
|
||||
} else {
|
||||
quote_stmt!(cx, let mut $field = None;)
|
||||
}
|
||||
})
|
||||
.collect();
|
||||
|
||||
// Match arms to extract a value for a field.
|
||||
let value_arms: Vec<ast::Arm> = field_names.iter()
|
||||
.map(|field| {
|
||||
quote_arm!(cx, __Field::$field => {
|
||||
$field = Some(try!(visitor.visit_value()));
|
||||
})
|
||||
})
|
||||
.collect();
|
||||
|
||||
let extract_values: Vec<P<ast::Stmt>> = fields.iter()
|
||||
.zip(field_names.iter())
|
||||
.map(|(&(name, span), field)| {
|
||||
let name_str = cx.expr_str(span, token::get_ident(name));
|
||||
quote_stmt!(cx,
|
||||
let $field = match $field {
|
||||
Some($field) => $field,
|
||||
None => try!(visitor.missing_field($name_str)),
|
||||
};
|
||||
)
|
||||
})
|
||||
.collect();
|
||||
|
||||
let result = builder.expr().struct_path(struct_path)
|
||||
.with_id_exprs(
|
||||
fields.iter()
|
||||
.zip(field_names.iter())
|
||||
.map(|(&(name, _), field)| {
|
||||
(name, builder.expr().id(field))
|
||||
})
|
||||
)
|
||||
.build();
|
||||
|
||||
quote_expr!(cx, {
|
||||
$let_values
|
||||
|
||||
while let Some(key) = try!(visitor.visit_key()) {
|
||||
match key {
|
||||
$value_arms
|
||||
}
|
||||
}
|
||||
|
||||
$extract_values
|
||||
Ok($result)
|
||||
})
|
||||
}
|
||||
|
||||
fn deserialize_enum(
|
||||
cx: &ExtCtxt,
|
||||
builder: &aster::AstBuilder,
|
||||
type_ident: Ident,
|
||||
fields: &[(Ident, Span, StaticFields)],
|
||||
state: P<ast::Expr>,
|
||||
enum_def: &EnumDef,
|
||||
trait_generics: &ast::Generics,
|
||||
type_generics: &ast::Generics,
|
||||
value_ty: P<ast::Ty>,
|
||||
) -> P<ast::Expr> {
|
||||
let where_clause = &trait_generics.where_clause;
|
||||
|
||||
let (visitor_struct, visitor_expr) = deserialize_visitor(
|
||||
builder,
|
||||
trait_generics,
|
||||
);
|
||||
|
||||
let type_name = builder.expr().str(type_ident);
|
||||
|
||||
// Match arms to extract a variant from a string
|
||||
let variant_arms: Vec<ast::Arm> = fields.iter()
|
||||
.zip(enum_def.variants.iter())
|
||||
.map(|(&(name, span, ref fields), variant)| {
|
||||
let value = deserialize_enum_variant(
|
||||
cx,
|
||||
span,
|
||||
builder,
|
||||
type_ident,
|
||||
name,
|
||||
fields,
|
||||
cx.expr_ident(span, cx.ident_of("visitor")),
|
||||
variant,
|
||||
&value_ty,
|
||||
&trait_generics,
|
||||
&type_generics,
|
||||
);
|
||||
|
||||
let s = builder.expr().str(name);
|
||||
quote_arm!(cx, $s => $value,)
|
||||
})
|
||||
.collect();
|
||||
|
||||
quote_expr!(cx, {
|
||||
$visitor_struct;
|
||||
|
||||
impl $trait_generics ::serde::de::Visitor for __Visitor $type_generics $where_clause {
|
||||
type Value = $value_ty;
|
||||
|
||||
fn visit_enum<__V>(&mut self,
|
||||
name: &str,
|
||||
variant: &str,
|
||||
visitor: __V) -> Result<$value_ty, __V::Error>
|
||||
where __V: ::serde::de::EnumVisitor,
|
||||
{
|
||||
if name == $type_name {
|
||||
self.visit_variant(variant, visitor)
|
||||
} else {
|
||||
Err(::serde::de::Error::syntax_error())
|
||||
}
|
||||
}
|
||||
|
||||
fn visit_variant<__V>(&mut self,
|
||||
name: &str,
|
||||
mut visitor: __V) -> Result<$value_ty, __V::Error>
|
||||
where __V: ::serde::de::EnumVisitor
|
||||
{
|
||||
match name {
|
||||
$variant_arms
|
||||
_ => Err(::serde::de::Error::syntax_error()),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
$state.visit_enum($visitor_expr)
|
||||
})
|
||||
}
|
||||
|
||||
fn deserialize_enum_variant(
|
||||
cx: &ExtCtxt,
|
||||
span: Span,
|
||||
builder: &aster::AstBuilder,
|
||||
type_ident: Ident,
|
||||
variant_ident: Ident,
|
||||
fields: &StaticFields,
|
||||
state: P<ast::Expr>,
|
||||
variant: &P<ast::Variant>,
|
||||
value_ty: &P<ast::Ty>,
|
||||
trait_generics: &ast::Generics,
|
||||
type_generics: &ast::Generics,
|
||||
) -> P<ast::Expr> {
|
||||
let variant_path = builder.path()
|
||||
.ids(&[type_ident, variant_ident])
|
||||
.build();
|
||||
|
||||
match *fields {
|
||||
Unnamed(ref fields) if fields.is_empty() => {
|
||||
quote_expr!(cx, {
|
||||
try!($state.visit_unit());
|
||||
Ok($variant_path)
|
||||
})
|
||||
}
|
||||
|
||||
Unnamed(ref fields) => {
|
||||
deserialize_enum_variant_seq(
|
||||
cx,
|
||||
builder,
|
||||
&*fields,
|
||||
variant_path,
|
||||
trait_generics,
|
||||
type_generics,
|
||||
state,
|
||||
value_ty,
|
||||
)
|
||||
}
|
||||
Named(ref fields) => {
|
||||
deserialize_enum_variant_map(
|
||||
cx,
|
||||
span,
|
||||
builder,
|
||||
&*fields,
|
||||
variant_path,
|
||||
trait_generics,
|
||||
type_generics,
|
||||
state,
|
||||
value_ty,
|
||||
variant,
|
||||
)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn deserialize_enum_variant_seq(
|
||||
cx: &ExtCtxt,
|
||||
builder: &aster::AstBuilder,
|
||||
fields: &[Span],
|
||||
variant_path: ast::Path,
|
||||
trait_generics: &ast::Generics,
|
||||
type_generics: &ast::Generics,
|
||||
state: P<ast::Expr>,
|
||||
value_ty: &P<ast::Ty>,
|
||||
) -> P<ast::Expr> {
|
||||
let where_clause = &trait_generics.where_clause;
|
||||
|
||||
// Create the field names for the fields.
|
||||
let field_names: Vec<ast::Ident> = (0 .. fields.len())
|
||||
.map(|i| token::str_to_ident(&format!("__field{}", i)))
|
||||
.collect();
|
||||
|
||||
let visit_seq_expr = declare_visit_seq(
|
||||
cx,
|
||||
builder,
|
||||
variant_path,
|
||||
&field_names,
|
||||
);
|
||||
|
||||
let (visitor_struct, visitor_expr) = deserialize_visitor(
|
||||
builder,
|
||||
trait_generics,
|
||||
);
|
||||
|
||||
quote_expr!(cx, {
|
||||
$visitor_struct
|
||||
|
||||
impl $trait_generics ::serde::de::EnumSeqVisitor for __Visitor $type_generics $where_clause {
|
||||
type Value = $value_ty;
|
||||
|
||||
fn visit<
|
||||
V: ::serde::de::SeqVisitor,
|
||||
>(&mut self, mut visitor: V) -> Result<$value_ty, V::Error> {
|
||||
$visit_seq_expr
|
||||
}
|
||||
}
|
||||
|
||||
$state.visit_seq($visitor_expr)
|
||||
})
|
||||
}
|
||||
|
||||
fn deserialize_enum_variant_map(
|
||||
cx: &ExtCtxt,
|
||||
span: Span,
|
||||
builder: &aster::AstBuilder,
|
||||
fields: &[(Ident, Span)],
|
||||
variant_path: ast::Path,
|
||||
trait_generics: &ast::Generics,
|
||||
type_generics: &ast::Generics,
|
||||
state: P<ast::Expr>,
|
||||
value_ty: &P<ast::Ty>,
|
||||
variant: &P<ast::Variant>,
|
||||
) -> P<ast::Expr> {
|
||||
let where_clause = &trait_generics.where_clause;
|
||||
|
||||
// Create the field names for the fields.
|
||||
let field_names: Vec<ast::Ident> = (0 .. fields.len())
|
||||
.map(|i| token::str_to_ident(&format!("__field{}", i)))
|
||||
.collect();
|
||||
|
||||
let field_devisitor = declare_map_field_devisitor(
|
||||
cx,
|
||||
span,
|
||||
builder,
|
||||
&field_names,
|
||||
fields,
|
||||
match variant.node.kind {
|
||||
ast::VariantKind::StructVariantKind(ref sd) => &*sd,
|
||||
_ => panic!("Mismatched enum types")
|
||||
},
|
||||
);
|
||||
|
||||
let visit_map_expr = declare_visit_map(
|
||||
cx,
|
||||
builder,
|
||||
variant_path,
|
||||
&field_names,
|
||||
fields,
|
||||
match variant.node.kind {
|
||||
ast::VariantKind::StructVariantKind(ref sd) => &*sd,
|
||||
_ => panic!("Mismatched enum types")
|
||||
},
|
||||
);
|
||||
|
||||
let (visitor_struct, visitor_expr) = deserialize_visitor(
|
||||
builder,
|
||||
trait_generics
|
||||
);
|
||||
|
||||
quote_expr!(cx, {
|
||||
$visitor_struct
|
||||
$field_devisitor
|
||||
|
||||
impl $trait_generics ::serde::de::EnumMapVisitor for __Visitor $type_generics $where_clause {
|
||||
type Value = $value_ty;
|
||||
|
||||
fn visit<
|
||||
V: ::serde::de::MapVisitor,
|
||||
>(&mut self, mut visitor: V) -> Result<$value_ty, V::Error> {
|
||||
$visit_map_expr
|
||||
}
|
||||
}
|
||||
|
||||
$state.visit_map($visitor_expr)
|
||||
})
|
||||
}
|
||||
Reference in New Issue
Block a user