mirror of
https://github.com/pezkuwichain/serde.git
synced 2026-04-29 11:47:55 +00:00
Split serde_macros into multiple files
This commit is contained in:
Erick Tryzelaar
@@ -0,0 +1,571 @@
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use syntax::ast::{
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Ident,
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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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};
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use syntax::ast;
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use syntax::codemap::Span;
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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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EnumMatching,
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FieldInfo,
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MethodDef,
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Struct,
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Substructure,
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TraitDef,
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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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borrowed_explicit_self,
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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_serialize(
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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![],
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path: Path::new(vec!["serde", "ser", "Serialize"]),
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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: "serialize",
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generics: LifetimeBounds {
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lifetimes: Vec::new(),
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bounds: vec![
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("__S", vec![Path::new(vec!["serde", "ser", "Serializer"])]),
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]
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},
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explicit_self: borrowed_explicit_self(),
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args: vec![
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Ty::Ptr(
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Box::new(Ty::Literal(Path::new_local("__S"))),
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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::Tuple(vec![])),
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Box::new(Ty::Literal(Path::new_(vec!["__S", "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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serialize_substructure(a, b, c, item)
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})),
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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 serialize_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 serializer = substr.nonself_args[0].clone();
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match (&item.node, &*substr.fields) {
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(&ast::ItemStruct(ref struct_def, ref generics), &Struct(ref fields)) => {
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let mut named_fields = vec![];
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let mut unnamed_fields = 0;
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for field in fields {
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match field.name {
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Some(name) => { named_fields.push(name); }
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None => { unnamed_fields += 1; }
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}
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}
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match (named_fields.is_empty(), unnamed_fields == 0) {
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(true, true) => {
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serialize_unit_struct(
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cx,
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&builder,
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serializer,
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substr.type_ident,
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)
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}
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(true, false) => {
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serialize_tuple_struct(
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cx,
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&builder,
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serializer,
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substr.type_ident,
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unnamed_fields,
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generics,
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)
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}
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(false, true) => {
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serialize_struct(
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cx,
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&builder,
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serializer,
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substr.type_ident,
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&named_fields,
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struct_def,
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generics,
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)
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}
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(false, false) => {
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cx.bug("struct has named and unnamed fields")
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}
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}
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}
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(&ast::ItemEnum(_, ref generics), &EnumMatching(_idx, variant, ref fields)) => {
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serialize_enum(
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cx,
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&builder,
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serializer,
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substr.type_ident,
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variant,
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&fields,
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generics,
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)
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}
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_ => cx.bug("expected Struct or EnumMatching in derive_serialize")
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}
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}
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fn serialize_unit_struct(
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cx: &ExtCtxt,
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builder: &aster::AstBuilder,
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serializer: P<Expr>,
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type_ident: Ident
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) -> P<Expr> {
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let type_name = builder.expr().str(type_ident);
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quote_expr!(cx, $serializer.visit_named_unit($type_name))
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}
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fn serialize_tuple_struct(
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cx: &ExtCtxt,
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builder: &aster::AstBuilder,
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serializer: P<Expr>,
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type_ident: Ident,
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fields: usize,
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generics: &ast::Generics
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) -> P<Expr> {
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let value_ty = builder.ty()
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.ref_()
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.lifetime("'__a")
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.ty().path()
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.segment(type_ident).with_generics(generics.clone()).build()
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.build();
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let (visitor_struct, visitor_impl) = serialize_tuple_struct_visitor(
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cx,
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builder,
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value_ty,
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fields,
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generics,
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);
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let type_name = builder.expr().str(type_ident);
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quote_expr!(cx, {
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$visitor_struct
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$visitor_impl
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$serializer.visit_named_seq($type_name, Visitor {
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value: self,
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state: 0,
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})
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})
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}
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fn serialize_struct(
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cx: &ExtCtxt,
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builder: &aster::AstBuilder,
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serializer: P<Expr>,
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type_ident: Ident,
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fields: &[Ident],
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struct_def: &StructDef,
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generics: &ast::Generics
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) -> P<Expr> {
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let value_ty = builder.ty()
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.ref_()
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.lifetime("'__a")
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.ty().path()
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.segment(type_ident).with_generics(generics.clone()).build()
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.build();
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let (visitor_struct, visitor_impl) = serialize_struct_visitor(
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cx,
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builder,
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value_ty,
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struct_def,
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generics,
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fields.iter().map(|field| quote_expr!(cx, &self.value.$field)),
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);
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let type_name = builder.expr().str(type_ident);
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quote_expr!(cx, {
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$visitor_struct
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$visitor_impl
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$serializer.visit_named_map($type_name, Visitor {
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value: self,
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state: 0,
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})
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})
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}
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fn serialize_enum(
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cx: &ExtCtxt,
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builder: &aster::AstBuilder,
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serializer: P<Expr>,
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type_ident: Ident,
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variant: &ast::Variant,
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fields: &[FieldInfo],
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generics: &ast::Generics,
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) -> P<Expr> {
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let type_name = builder.expr().str(type_ident);
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let variant_name = builder.expr().str(variant.node.name);
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if fields.is_empty() {
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quote_expr!(cx,
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::serde::ser::Serializer::visit_enum_unit(
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$serializer,
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$type_name,
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$variant_name)
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)
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} else {
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match variant.node.kind {
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ast::TupleVariantKind(ref args) => {
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serialize_tuple_variant(
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cx,
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builder,
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serializer,
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type_name,
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variant_name,
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generics,
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args,
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fields,
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)
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}
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ast::StructVariantKind(ref struct_def) => {
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serialize_struct_variant(
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cx,
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builder,
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serializer,
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type_name,
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variant_name,
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generics,
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struct_def,
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fields,
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)
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}
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}
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}
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}
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fn serialize_tuple_variant(
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cx: &ExtCtxt,
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builder: &aster::AstBuilder,
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serializer: P<Expr>,
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type_name: P<ast::Expr>,
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variant_name: P<ast::Expr>,
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generics: &ast::Generics,
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args: &[ast::VariantArg],
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fields: &[FieldInfo],
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) -> P<Expr> {
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let value_ty = builder.ty().tuple()
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.with_tys(
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args.iter().map(|arg| {
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builder.ty()
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.ref_()
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.lifetime("'__a")
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.build_ty(arg.ty.clone())
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})
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)
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.build();
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let value_expr = builder.expr().tuple()
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.with_exprs(
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fields.iter().map(|field| {
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builder.expr()
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||||
.addr_of()
|
||||
.build(field.self_.clone())
|
||||
})
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)
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.build();
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|
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let (visitor_struct, visitor_impl) = serialize_tuple_struct_visitor(
|
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cx,
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builder,
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value_ty,
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args.len(),
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||||
generics,
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||||
);
|
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|
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quote_expr!(cx, {
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$visitor_struct
|
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$visitor_impl
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$serializer.visit_enum_seq($type_name, $variant_name, Visitor {
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||||
value: $value_expr,
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||||
state: 0,
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||||
})
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||||
})
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}
|
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|
||||
fn serialize_struct_variant(
|
||||
cx: &ExtCtxt,
|
||||
builder: &aster::AstBuilder,
|
||||
serializer: P<Expr>,
|
||||
type_name: P<ast::Expr>,
|
||||
variant_name: P<ast::Expr>,
|
||||
generics: &ast::Generics,
|
||||
struct_def: &ast::StructDef,
|
||||
fields: &[FieldInfo],
|
||||
) -> P<Expr> {
|
||||
let value_ty = builder.ty().tuple()
|
||||
.with_tys(
|
||||
struct_def.fields.iter().map(|field| {
|
||||
builder.ty()
|
||||
.ref_()
|
||||
.lifetime("'__a")
|
||||
.build_ty(field.node.ty.clone())
|
||||
})
|
||||
)
|
||||
.build();
|
||||
|
||||
let value_expr = builder.expr().tuple()
|
||||
.with_exprs(
|
||||
fields.iter().map(|field| {
|
||||
builder.expr()
|
||||
.addr_of()
|
||||
.build(field.self_.clone())
|
||||
})
|
||||
)
|
||||
.build();
|
||||
|
||||
let (visitor_struct, visitor_impl) = serialize_struct_visitor(
|
||||
cx,
|
||||
builder,
|
||||
value_ty,
|
||||
struct_def,
|
||||
generics,
|
||||
(0 .. fields.len()).map(|i| {
|
||||
builder.expr()
|
||||
.tup_field(i)
|
||||
.field("value").self_()
|
||||
})
|
||||
);
|
||||
|
||||
quote_expr!(cx, {
|
||||
$visitor_struct
|
||||
$visitor_impl
|
||||
$serializer.visit_enum_map($type_name, $variant_name, Visitor {
|
||||
value: $value_expr,
|
||||
state: 0,
|
||||
})
|
||||
})
|
||||
}
|
||||
|
||||
fn serialize_tuple_struct_visitor(
|
||||
cx: &ExtCtxt,
|
||||
builder: &aster::AstBuilder,
|
||||
value_ty: P<ast::Ty>,
|
||||
fields: usize,
|
||||
generics: &ast::Generics
|
||||
) -> (P<ast::Item>, P<ast::Item>) {
|
||||
let arms: Vec<ast::Arm> = (0 .. fields)
|
||||
.map(|i| {
|
||||
let first = builder.expr().bool(i == 0);
|
||||
let expr = builder.expr()
|
||||
.tup_field(i)
|
||||
.field("value").self_();
|
||||
|
||||
quote_arm!(cx,
|
||||
$i => {
|
||||
self.state += 1;
|
||||
let v = try!(serializer.visit_seq_elt($first, &$expr));
|
||||
Ok(Some(v))
|
||||
}
|
||||
)
|
||||
})
|
||||
.collect();
|
||||
|
||||
let visitor_impl_generics = builder.from_generics(generics.clone())
|
||||
.add_lifetime_bound("'__a")
|
||||
.add_ty_param_bound(
|
||||
builder.path().global().ids(&["serde", "ser", "Serialize"]).build()
|
||||
)
|
||||
.lifetime_name("'__a")
|
||||
.build();
|
||||
|
||||
let where_clause = &visitor_impl_generics.where_clause;
|
||||
|
||||
let visitor_generics = builder.from_generics(visitor_impl_generics.clone())
|
||||
.strip_bounds()
|
||||
.build();
|
||||
|
||||
(
|
||||
quote_item!(cx,
|
||||
struct Visitor $visitor_impl_generics $where_clause {
|
||||
state: usize,
|
||||
value: $value_ty,
|
||||
}
|
||||
).unwrap(),
|
||||
|
||||
quote_item!(cx,
|
||||
impl $visitor_impl_generics ::serde::ser::SeqVisitor
|
||||
for Visitor $visitor_generics
|
||||
$where_clause {
|
||||
#[inline]
|
||||
fn visit<S>(&mut self, serializer: &mut S) -> Result<Option<()>, S::Error>
|
||||
where S: ::serde::ser::Serializer,
|
||||
{
|
||||
match self.state {
|
||||
$arms
|
||||
_ => Ok(None),
|
||||
}
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn len(&self) -> Option<usize> {
|
||||
Some($fields)
|
||||
}
|
||||
}
|
||||
).unwrap(),
|
||||
)
|
||||
}
|
||||
|
||||
fn serialize_struct_visitor<I>(
|
||||
cx: &ExtCtxt,
|
||||
builder: &aster::AstBuilder,
|
||||
value_ty: P<ast::Ty>,
|
||||
struct_def: &StructDef,
|
||||
generics: &ast::Generics,
|
||||
value_exprs: I,
|
||||
) -> (P<ast::Item>, P<ast::Item>)
|
||||
where I: Iterator<Item=P<ast::Expr>>,
|
||||
{
|
||||
let len = struct_def.fields.len();
|
||||
|
||||
let key_exprs = struct_def.fields.iter()
|
||||
.map(|field| {
|
||||
match field_alias(field) {
|
||||
Some(lit) => builder.expr().build_lit(P(lit.clone())),
|
||||
None => {
|
||||
match field.node.kind {
|
||||
ast::NamedField(name, _) => {
|
||||
builder.expr().str(name)
|
||||
}
|
||||
ast::UnnamedField(_) => {
|
||||
cx.bug("struct has named and unnamed fields")
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
});
|
||||
|
||||
let arms: Vec<ast::Arm> = key_exprs
|
||||
.zip(value_exprs)
|
||||
.enumerate()
|
||||
.map(|(i, (key_expr, value_expr))| {
|
||||
let first = i == 0;
|
||||
|
||||
quote_arm!(cx,
|
||||
$i => {
|
||||
self.state += 1;
|
||||
Ok(
|
||||
Some(
|
||||
try!(
|
||||
serializer.visit_map_elt(
|
||||
$first,
|
||||
$key_expr,
|
||||
$value_expr,
|
||||
)
|
||||
)
|
||||
)
|
||||
)
|
||||
}
|
||||
)
|
||||
})
|
||||
.collect();
|
||||
|
||||
let visitor_impl_generics = builder.from_generics(generics.clone())
|
||||
.add_lifetime_bound("'__a")
|
||||
.add_ty_param_bound(
|
||||
builder.path().global().ids(&["serde", "ser", "Serialize"]).build()
|
||||
)
|
||||
.lifetime_name("'__a")
|
||||
.build();
|
||||
|
||||
let where_clause = &visitor_impl_generics.where_clause;
|
||||
|
||||
let visitor_generics = builder.from_generics(visitor_impl_generics.clone())
|
||||
.strip_bounds()
|
||||
.build();
|
||||
|
||||
(
|
||||
quote_item!(cx,
|
||||
struct Visitor $visitor_impl_generics $where_clause {
|
||||
state: usize,
|
||||
value: $value_ty,
|
||||
}
|
||||
).unwrap(),
|
||||
|
||||
quote_item!(cx,
|
||||
impl $visitor_impl_generics
|
||||
::serde::ser::MapVisitor
|
||||
for Visitor $visitor_generics
|
||||
$where_clause {
|
||||
#[inline]
|
||||
fn visit<S>(&mut self, serializer: &mut S) -> Result<Option<()>, S::Error>
|
||||
where S: ::serde::ser::Serializer,
|
||||
{
|
||||
match self.state {
|
||||
$arms
|
||||
_ => Ok(None),
|
||||
}
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn len(&self) -> Option<usize> {
|
||||
Some($len)
|
||||
}
|
||||
}
|
||||
).unwrap(),
|
||||
)
|
||||
}
|
||||
Reference in New Issue
Block a user