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Merge branch 'origin/1.0' into 'origin/identifier'

Browse Source 
Conflicts:
    serde_derive/src/ser.rs
This commit is contained in:
David Tolnay
2017-04-10 12:37:41 -07:00
parent 52e93150e6 517270a943
commit 1985cfc955
18 changed files with 795 additions and 241 deletions
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serde_derive/src/de.rs
+218 -132
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@@ -14,17 +14,25 @@ pub fn expand_derive_deserialize(item: &syn::DeriveInput) -> Result<Tokens, Stri
try!(ctxt.check());
let ident = &item.ident;
let generics = build_generics(&item);
let borrowed = borrowed_lifetimes(&item);
let params = Parameters { generics: generics, borrowed: borrowed };
let (de_impl_generics, _, ty_generics, where_clause) = split_with_de_lifetime(&params);
let params = Parameters::new(&item);
let dummy_const = Ident::new(format!("_IMPL_DESERIALIZE_FOR_{}", ident));
let body = Stmts(deserialize_body(&item, &params));
Ok(quote! {
#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
const #dummy_const: () = {
extern crate serde as _serde;
let impl_item = if let Some(remote) = item.attrs.remote() {
let (impl_generics, ty_generics, where_clause) = item.generics.split_for_impl();
let de_lifetime = params.de_lifetime_def();
quote! {
impl #impl_generics #ident #ty_generics #where_clause {
fn deserialize<#de_lifetime, __D>(__deserializer: __D) -> _serde::export::Result<#remote #ty_generics, __D::Error>
where __D: _serde::Deserializer<'de>
{
#body
}
}
}
} else {
let (de_impl_generics, _, ty_generics, where_clause) = split_with_de_lifetime(&params);
quote! {
#[automatically_derived]
impl #de_impl_generics _serde::Deserialize<'de> for #ident #ty_generics #where_clause {
fn deserialize<__D>(__deserializer: __D) -> _serde::export::Result<Self, __D::Error>
@@ -33,13 +41,72 @@ pub fn expand_derive_deserialize(item: &syn::DeriveInput) -> Result<Tokens, Stri
#body
}
}
}
};
Ok(quote! {
#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
const #dummy_const: () = {
extern crate serde as _serde;
#impl_item
};
})
}
struct Parameters {
/// Name of the type the `derive` is on.
local: syn::Ident,
/// Path to the type the impl is for. Either a single `Ident` for local
/// types or `some::remote::Ident` for remote types. Does not include
/// generic parameters.
this: syn::Path,
/// Generics including any explicit and inferred bounds for the impl.
generics: syn::Generics,
/// Lifetimes borrowed from the deserializer. These will become bounds on
/// the `'de` lifetime of the deserializer.
borrowed: BTreeSet<syn::Lifetime>,
/// At least one field has a serde(getter) attribute, implying that the
/// remote type has a private field.
has_getter: bool,
}
impl Parameters {
fn new(item: &Item) -> Self {
let local = item.ident.clone();
let this = match item.attrs.remote() {
Some(remote) => remote.clone(),
None => item.ident.clone().into(),
};
let generics = build_generics(item);
let borrowed = borrowed_lifetimes(item);
let has_getter = item.body.has_getter();
Parameters {
local: local,
this: this,
generics: generics,
borrowed: borrowed,
has_getter: has_getter,
}
}
/// Type name to use in error messages and `&'static str` arguments to
/// various Deserializer methods.
fn type_name(&self) -> &str {
self.this.segments.last().unwrap().ident.as_ref()
}
fn de_lifetime_def(&self) -> syn::LifetimeDef {
syn::LifetimeDef {
attrs: Vec::new(),
lifetime: syn::Lifetime::new("'de"),
bounds: self.borrowed.iter().cloned().collect(),
}
}
}
// All the generics in the input, plus a bound `T: Deserialize` for each generic
@@ -109,14 +176,13 @@ fn deserialize_body(item: &Item, params: &Parameters) -> Fragment {
} else {
match item.body {
Body::Enum(ref variants) => {
deserialize_item_enum(&item.ident, params, variants, &item.attrs)
deserialize_item_enum(params, variants, &item.attrs)
}
Body::Struct(Style::Struct, ref fields) => {
if fields.iter().any(|field| field.ident.is_none()) {
panic!("struct has unnamed fields");
}
deserialize_struct(&item.ident,
None,
deserialize_struct(None,
params,
fields,
&item.attrs,
@@ -127,14 +193,13 @@ fn deserialize_body(item: &Item, params: &Parameters) -> Fragment {
if fields.iter().any(|field| field.ident.is_some()) {
panic!("tuple struct has named fields");
}
deserialize_tuple(&item.ident,
None,
deserialize_tuple(None,
params,
fields,
&item.attrs,
None)
}
Body::Struct(Style::Unit, _) => deserialize_unit_struct(&item.ident, &item.attrs),
Body::Struct(Style::Unit, _) => deserialize_unit_struct(params, &item.attrs),
}
}
}
@@ -147,26 +212,27 @@ fn deserialize_from(from_type: &syn::Ty) -> Fragment {
}
}
fn deserialize_unit_struct(ident: &syn::Ident, item_attrs: &attr::Item) -> Fragment {
fn deserialize_unit_struct(params: &Parameters, item_attrs: &attr::Item) -> Fragment {
let this = &params.this;
let type_name = item_attrs.name().deserialize_name();
let expecting = format!("unit struct {}", ident);
let expecting = format!("unit struct {}", params.type_name());
quote_block! {
struct __Visitor;
impl<'de> _serde::de::Visitor<'de> for __Visitor {
type Value = #ident;
type Value = #this;
fn expecting(&self, formatter: &mut _serde::export::fmt::Formatter) -> _serde::export::fmt::Result {
_serde::export::fmt::Formatter::write_str(formatter, #expecting)
}
#[inline]
fn visit_unit<__E>(self) -> _serde::export::Result<#ident, __E>
fn visit_unit<__E>(self) -> _serde::export::Result<Self::Value, __E>
where __E: _serde::de::Error
{
_serde::export::Ok(#ident)
_serde::export::Ok(#this)
}
}
@@ -174,38 +240,48 @@ fn deserialize_unit_struct(ident: &syn::Ident, item_attrs: &attr::Item) -> Fragm
}
}
fn deserialize_tuple(ident: &syn::Ident,
variant_ident: Option<&syn::Ident>,
fn deserialize_tuple(variant_ident: Option<&syn::Ident>,
params: &Parameters,
fields: &[Field],
item_attrs: &attr::Item,
deserializer: Option<Tokens>)
-> Fragment {
let this = &params.this;
let (de_impl_generics, de_ty_generics, ty_generics, where_clause) = split_with_de_lifetime(params);
// If there are getters (implying private fields), construct the local type
// and use an `Into` conversion to get the remote type. If there are no
// getters then construct the target type directly.
let construct = if params.has_getter {
let local = &params.local;
quote!(#local)
} else {
quote!(#this)
};
let is_enum = variant_ident.is_some();
let type_path = match variant_ident {
Some(variant_ident) => quote!(#ident::#variant_ident),
None => quote!(#ident),
Some(variant_ident) => quote!(#construct::#variant_ident),
None => construct,
};
let expecting = match variant_ident {
Some(variant_ident) => format!("tuple variant {}::{}", ident, variant_ident),
None => format!("tuple struct {}", ident),
Some(variant_ident) => format!("tuple variant {}::{}", params.type_name(), variant_ident),
None => format!("tuple struct {}", params.type_name()),
};
let nfields = fields.len();
let visit_newtype_struct = if !is_enum && nfields == 1 {
Some(deserialize_newtype_struct(ident, &type_path, params, &fields[0]))
Some(deserialize_newtype_struct(&type_path, params, &fields[0]))
} else {
None
};
let visit_seq = Stmts(deserialize_seq(ident, &type_path, params, fields, false, item_attrs));
let visit_seq = Stmts(deserialize_seq(&type_path, params, fields, false, item_attrs));
let visitor_expr = quote! {
__Visitor {
marker: _serde::export::PhantomData::<#ident #ty_generics>,
marker: _serde::export::PhantomData::<#this #ty_generics>,
lifetime: _serde::export::PhantomData,
}
};
@@ -230,12 +306,12 @@ fn deserialize_tuple(ident: &syn::Ident,
quote_block! {
struct __Visitor #de_impl_generics #where_clause {
marker: _serde::export::PhantomData<#ident #ty_generics>,
marker: _serde::export::PhantomData<#this #ty_generics>,
lifetime: _serde::export::PhantomData<&'de ()>,
}
impl #de_impl_generics _serde::de::Visitor<'de> for __Visitor #de_ty_generics #where_clause {
type Value = #ident #ty_generics;
type Value = #this #ty_generics;
fn expecting(&self, formatter: &mut _serde::export::fmt::Formatter) -> _serde::export::fmt::Result {
_serde::export::fmt::Formatter::write_str(formatter, #expecting)
@@ -255,8 +331,7 @@ fn deserialize_tuple(ident: &syn::Ident,
}
}
fn deserialize_seq(ident: &syn::Ident,
type_path: &Tokens,
fn deserialize_seq(type_path: &Tokens,
params: &Parameters,
fields: &[Field],
is_struct: bool,
@@ -285,7 +360,7 @@ fn deserialize_seq(ident: &syn::Ident,
}
Some(path) => {
let (wrapper, wrapper_ty) = wrap_deserialize_with(
ident, params, field.ty, path);
params, field.ty, path);
quote!({
#wrapper
_serde::export::Option::map(
@@ -307,7 +382,7 @@ fn deserialize_seq(ident: &syn::Ident,
}
});
let result = if is_struct {
let mut result = if is_struct {
let names = fields.iter().map(|f| &f.ident);
quote! {
#type_path { #( #names: #vars ),* }
@@ -318,14 +393,20 @@ fn deserialize_seq(ident: &syn::Ident,
}
};
if params.has_getter {
let this = &params.this;
result = quote! {
_serde::export::Into::<#this>::into(#result)
};
}
quote_block! {
#(#let_values)*
_serde::export::Ok(#result)
}
}
fn deserialize_newtype_struct(ident: &syn::Ident,
type_path: &Tokens,
fn deserialize_newtype_struct(type_path: &Tokens,
params: &Parameters,
field: &Field)
-> Tokens {
@@ -338,25 +419,33 @@ fn deserialize_newtype_struct(ident: &syn::Ident,
}
Some(path) => {
let (wrapper, wrapper_ty) =
wrap_deserialize_with(ident, params, field.ty, path);
wrap_deserialize_with(params, field.ty, path);
quote!({
#wrapper
try!(<#wrapper_ty as _serde::Deserialize>::deserialize(__e)).value
})
}
};
let mut result = quote!(#type_path(#value));
if params.has_getter {
let this = &params.this;
result = quote! {
_serde::export::Into::<#this>::into(#result)
};
}
quote! {
#[inline]
fn visit_newtype_struct<__E>(self, __e: __E) -> _serde::export::Result<Self::Value, __E::Error>
where __E: _serde::Deserializer<'de>
{
_serde::export::Ok(#type_path(#value))
_serde::export::Ok(#result)
}
}
}
fn deserialize_struct(ident: &syn::Ident,
variant_ident: Option<&syn::Ident>,
fn deserialize_struct(variant_ident: Option<&syn::Ident>,
params: &Parameters,
fields: &[Field],
item_attrs: &attr::Item,
@@ -365,28 +454,39 @@ fn deserialize_struct(ident: &syn::Ident,
let is_enum = variant_ident.is_some();
let is_untagged = deserializer.is_some();
let this = &params.this;
let (de_impl_generics, de_ty_generics, ty_generics, where_clause) = split_with_de_lifetime(params);
// If there are getters (implying private fields), construct the local type
// and use an `Into` conversion to get the remote type. If there are no
// getters then construct the target type directly.
let construct = if params.has_getter {
let local = &params.local;
quote!(#local)
} else {
quote!(#this)
};
let type_path = match variant_ident {
Some(variant_ident) => quote!(#ident::#variant_ident),
None => quote!(#ident),
Some(variant_ident) => quote!(#construct::#variant_ident),
None => construct,
};
let expecting = match variant_ident {
Some(variant_ident) => format!("struct variant {}::{}", ident, variant_ident),
None => format!("struct {}", ident),
Some(variant_ident) => format!("struct variant {}::{}", params.type_name(), variant_ident),
None => format!("struct {}", params.type_name()),
};
let visit_seq = Stmts(deserialize_seq(ident, &type_path, params, fields, true, item_attrs));
let visit_seq = Stmts(deserialize_seq(&type_path, params, fields, true, item_attrs));
let (field_visitor, fields_stmt, visit_map) =
deserialize_struct_visitor(ident, type_path, params, fields, item_attrs);
deserialize_struct_visitor(type_path, params, fields, item_attrs);
let field_visitor = Stmts(field_visitor);
let fields_stmt = Stmts(fields_stmt);
let visit_map = Stmts(visit_map);
let visitor_expr = quote! {
__Visitor {
marker: _serde::export::PhantomData::<#ident #ty_generics>,
marker: _serde::export::PhantomData::<#this #ty_generics>,
lifetime: _serde::export::PhantomData,
}
};
@@ -430,12 +530,12 @@ fn deserialize_struct(ident: &syn::Ident,
#field_visitor
struct __Visitor #de_impl_generics #where_clause {
marker: _serde::export::PhantomData<#ident #ty_generics>,
marker: _serde::export::PhantomData<#this #ty_generics>,
lifetime: _serde::export::PhantomData<&'de ()>,
}
impl #de_impl_generics _serde::de::Visitor<'de> for __Visitor #de_ty_generics #where_clause {
type Value = #ident #ty_generics;
type Value = #this #ty_generics;
fn expecting(&self, formatter: &mut _serde::export::fmt::Formatter) -> _serde::export::fmt::Result {
_serde::export::fmt::Formatter::write_str(formatter, #expecting)
@@ -457,46 +557,43 @@ fn deserialize_struct(ident: &syn::Ident,
}
}
fn deserialize_item_enum(ident: &syn::Ident,
params: &Parameters,
fn deserialize_item_enum(params: &Parameters,
variants: &[Variant],
item_attrs: &attr::Item)
-> Fragment {
match *item_attrs.tag() {
attr::EnumTag::External => {
deserialize_externally_tagged_enum(ident, params, variants, item_attrs)
deserialize_externally_tagged_enum(params, variants, item_attrs)
}
attr::EnumTag::Internal { ref tag } => {
deserialize_internally_tagged_enum(ident,
params,
deserialize_internally_tagged_enum(params,
variants,
item_attrs,
tag)
}
attr::EnumTag::Adjacent { ref tag, ref content } => {
deserialize_adjacently_tagged_enum(ident,
params,
deserialize_adjacently_tagged_enum(params,
variants,
item_attrs,
tag,
content)
}
attr::EnumTag::None => {
deserialize_untagged_enum(ident, params, variants, item_attrs)
deserialize_untagged_enum(params, variants, item_attrs)
}
}
}
fn deserialize_externally_tagged_enum(ident: &syn::Ident,
params: &Parameters,
fn deserialize_externally_tagged_enum(params: &Parameters,
variants: &[Variant],
item_attrs: &attr::Item)
-> Fragment {
let this = &params.this;
let (de_impl_generics, de_ty_generics, ty_generics, where_clause) = split_with_de_lifetime(params);
let type_name = item_attrs.name().deserialize_name();
let expecting = format!("enum {}", ident);
let expecting = format!("enum {}", params.type_name());
let variant_names_idents: Vec<_> = variants.iter()
.enumerate()
@@ -520,8 +617,7 @@ fn deserialize_externally_tagged_enum(ident: &syn::Ident,
.map(|(i, variant)| {
let variant_name = field_i(i);
let block = Match(deserialize_externally_tagged_variant(ident,
params,
let block = Match(deserialize_externally_tagged_variant(params,
variant,
item_attrs));
@@ -554,12 +650,12 @@ fn deserialize_externally_tagged_enum(ident: &syn::Ident,
#variant_visitor
struct __Visitor #de_impl_generics #where_clause {
marker: _serde::export::PhantomData<#ident #ty_generics>,
marker: _serde::export::PhantomData<#this #ty_generics>,
lifetime: _serde::export::PhantomData<&'de ()>,
}
impl #de_impl_generics _serde::de::Visitor<'de> for __Visitor #de_ty_generics #where_clause {
type Value = #ident #ty_generics;
type Value = #this #ty_generics;
fn expecting(&self, formatter: &mut _serde::export::fmt::Formatter) -> _serde::export::fmt::Result {
_serde::export::fmt::Formatter::write_str(formatter, #expecting)
@@ -576,14 +672,13 @@ fn deserialize_externally_tagged_enum(ident: &syn::Ident,
_serde::Deserializer::deserialize_enum(__deserializer, #type_name, VARIANTS,
__Visitor {
marker: _serde::export::PhantomData::<#ident #ty_generics>,
marker: _serde::export::PhantomData::<#this #ty_generics>,
lifetime: _serde::export::PhantomData,
})
}
}
fn deserialize_internally_tagged_enum(ident: &syn::Ident,
params: &Parameters,
fn deserialize_internally_tagged_enum(params: &Parameters,
variants: &[Variant],
item_attrs: &attr::Item,
tag: &str)
@@ -611,7 +706,6 @@ fn deserialize_internally_tagged_enum(ident: &syn::Ident,
let variant_name = field_i(i);
let block = Match(deserialize_internally_tagged_variant(
ident,
params,
variant,
item_attrs,
@@ -638,13 +732,13 @@ fn deserialize_internally_tagged_enum(ident: &syn::Ident,
}
}
fn deserialize_adjacently_tagged_enum(ident: &syn::Ident,
params: &Parameters,
fn deserialize_adjacently_tagged_enum(params: &Parameters,
variants: &[Variant],
item_attrs: &attr::Item,
tag: &str,
content: &str)
-> Fragment {
let this = &params.this;
let (de_impl_generics, de_ty_generics, ty_generics, where_clause) = split_with_de_lifetime(params);
let variant_names_idents: Vec<_> = variants.iter()
@@ -669,7 +763,6 @@ fn deserialize_adjacently_tagged_enum(ident: &syn::Ident,
let variant_index = field_i(i);
let block = Match(deserialize_untagged_variant(
ident,
params,
variant,
item_attrs,
@@ -682,7 +775,7 @@ fn deserialize_adjacently_tagged_enum(ident: &syn::Ident,
})
.collect();
let expecting = format!("adjacently tagged enum {}", ident);
let expecting = format!("adjacently tagged enum {}", params.type_name());
let type_name = item_attrs.name().deserialize_name();
let tag_or_content = quote! {
@@ -717,7 +810,7 @@ fn deserialize_adjacently_tagged_enum(ident: &syn::Ident,
let variant_index = field_i(i);
let variant_ident = &variant.ident;
quote! {
__Field::#variant_index => _serde::export::Ok(#ident::#variant_ident),
__Field::#variant_index => _serde::export::Ok(#this::#variant_ident),
}
});
missing_content = quote! {
@@ -748,12 +841,12 @@ fn deserialize_adjacently_tagged_enum(ident: &syn::Ident,
struct __Seed #de_impl_generics #where_clause {
field: __Field,
marker: _serde::export::PhantomData<#ident #ty_generics>,
marker: _serde::export::PhantomData<#this #ty_generics>,
lifetime: _serde::export::PhantomData<&'de ()>,
}
impl #de_impl_generics _serde::de::DeserializeSeed<'de> for __Seed #de_ty_generics #where_clause {
type Value = #ident #ty_generics;
type Value = #this #ty_generics;
fn deserialize<__D>(self, __deserializer: __D) -> _serde::export::Result<Self::Value, __D::Error>
where __D: _serde::Deserializer<'de>
@@ -765,12 +858,12 @@ fn deserialize_adjacently_tagged_enum(ident: &syn::Ident,
}
struct __Visitor #de_impl_generics #where_clause {
marker: _serde::export::PhantomData<#ident #ty_generics>,
marker: _serde::export::PhantomData<#this #ty_generics>,
lifetime: _serde::export::PhantomData<&'de ()>,
}
impl #de_impl_generics _serde::de::Visitor<'de> for __Visitor #de_ty_generics #where_clause {
type Value = #ident #ty_generics;
type Value = #this #ty_generics;
fn expecting(&self, formatter: &mut _serde::export::fmt::Formatter) -> _serde::export::fmt::Result {
_serde::export::fmt::Formatter::write_str(formatter, #expecting)
@@ -871,14 +964,13 @@ fn deserialize_adjacently_tagged_enum(ident: &syn::Ident,
const FIELDS: &'static [&'static str] = &[#tag, #content];
_serde::Deserializer::deserialize_struct(__deserializer, #type_name, FIELDS,
__Visitor {
marker: _serde::export::PhantomData::<#ident #ty_generics>,
marker: _serde::export::PhantomData::<#this #ty_generics>,
lifetime: _serde::export::PhantomData,
})
}
}
fn deserialize_untagged_enum(ident: &syn::Ident,
params: &Parameters,
fn deserialize_untagged_enum(params: &Parameters,
variants: &[Variant],
item_attrs: &attr::Item)
-> Fragment {
@@ -886,7 +978,6 @@ fn deserialize_untagged_enum(ident: &syn::Ident,
.filter(|variant| !variant.attrs.skip_deserializing())
.map(|variant| {
Expr(deserialize_untagged_variant(
ident,
params,
variant,
item_attrs,
@@ -900,7 +991,7 @@ fn deserialize_untagged_enum(ident: &syn::Ident,
// largest number of fields. I'm not sure I like that. Maybe it would be
// better to save all the errors and combine them into one message that
// explains why none of the variants matched.
let fallthrough_msg = format!("data did not match any variant of untagged enum {}", ident);
let fallthrough_msg = format!("data did not match any variant of untagged enum {}", params.type_name());
quote_block! {
let __content = try!(<_serde::private::de::Content as _serde::Deserialize>::deserialize(__deserializer));
@@ -915,8 +1006,7 @@ fn deserialize_untagged_enum(ident: &syn::Ident,
}
}
fn deserialize_externally_tagged_variant(ident: &syn::Ident,
params: &Parameters,
fn deserialize_externally_tagged_variant(params: &Parameters,
variant: &Variant,
item_attrs: &attr::Item)
-> Fragment {
@@ -924,28 +1014,26 @@ fn deserialize_externally_tagged_variant(ident: &syn::Ident,
match variant.style {
Style::Unit => {
let this = &params.this;
quote_block! {
try!(_serde::de::VariantVisitor::visit_unit(__visitor));
_serde::export::Ok(#ident::#variant_ident)
_serde::export::Ok(#this::#variant_ident)
}
}
Style::Newtype => {
deserialize_externally_tagged_newtype_variant(ident,
variant_ident,
deserialize_externally_tagged_newtype_variant(variant_ident,
params,
&variant.fields[0])
}
Style::Tuple => {
deserialize_tuple(ident,
Some(variant_ident),
deserialize_tuple(Some(variant_ident),
params,
&variant.fields,
item_attrs,
None)
}
Style::Struct => {
deserialize_struct(ident,
Some(variant_ident),
deserialize_struct(Some(variant_ident),
params,
&variant.fields,
item_attrs,
@@ -954,8 +1042,7 @@ fn deserialize_externally_tagged_variant(ident: &syn::Ident,
}
}
fn deserialize_internally_tagged_variant(ident: &syn::Ident,
params: &Parameters,
fn deserialize_internally_tagged_variant(params: &Parameters,
variant: &Variant,
item_attrs: &attr::Item,
deserializer: Tokens)
@@ -964,16 +1051,16 @@ fn deserialize_internally_tagged_variant(ident: &syn::Ident,
match variant.style {
Style::Unit => {
let type_name = ident.as_ref();
let this = &params.this;
let type_name = params.type_name();
let variant_name = variant.ident.as_ref();
quote_block! {
try!(_serde::Deserializer::deserialize(#deserializer, _serde::private::de::InternallyTaggedUnitVisitor::new(#type_name, #variant_name)));
_serde::export::Ok(#ident::#variant_ident)
_serde::export::Ok(#this::#variant_ident)
}
}
Style::Newtype | Style::Struct => {
deserialize_untagged_variant(ident,
params,
deserialize_untagged_variant(params,
variant,
item_attrs,
deserializer)
@@ -982,8 +1069,7 @@ fn deserialize_internally_tagged_variant(ident: &syn::Ident,
}
}
fn deserialize_untagged_variant(ident: &syn::Ident,
params: &Parameters,
fn deserialize_untagged_variant(params: &Parameters,
variant: &Variant,
item_attrs: &attr::Item,
deserializer: Tokens)
@@ -992,7 +1078,8 @@ fn deserialize_untagged_variant(ident: &syn::Ident,
match variant.style {
Style::Unit => {
let type_name = ident.as_ref();
let this = &params.this;
let type_name = params.type_name();
let variant_name = variant.ident.as_ref();
quote_expr! {
_serde::export::Result::map(
@@ -1000,27 +1087,24 @@ fn deserialize_untagged_variant(ident: &syn::Ident,
#deserializer,
_serde::private::de::UntaggedUnitVisitor::new(#type_name, #variant_name)
),
|()| #ident::#variant_ident)
|()| #this::#variant_ident)
}
}
Style::Newtype => {
deserialize_untagged_newtype_variant(ident,
variant_ident,
deserialize_untagged_newtype_variant(variant_ident,
params,
&variant.fields[0],
deserializer)
}
Style::Tuple => {
deserialize_tuple(ident,
Some(variant_ident),
deserialize_tuple(Some(variant_ident),
params,
&variant.fields,
item_attrs,
Some(deserializer))
}
Style::Struct => {
deserialize_struct(ident,
Some(variant_ident),
deserialize_struct(Some(variant_ident),
params,
&variant.fields,
item_attrs,
@@ -1029,56 +1113,56 @@ fn deserialize_untagged_variant(ident: &syn::Ident,
}
}
fn deserialize_externally_tagged_newtype_variant(ident: &syn::Ident,
variant_ident: &syn::Ident,
fn deserialize_externally_tagged_newtype_variant(variant_ident: &syn::Ident,
params: &Parameters,
field: &Field)
-> Fragment {
let this = &params.this;
match field.attrs.deserialize_with() {
None => {
let field_ty = &field.ty;
quote_expr! {
_serde::export::Result::map(
_serde::de::VariantVisitor::visit_newtype::<#field_ty>(__visitor),
#ident::#variant_ident)
#this::#variant_ident)
}
}
Some(path) => {
let (wrapper, wrapper_ty) =
wrap_deserialize_with(ident, params, field.ty, path);
wrap_deserialize_with(params, field.ty, path);
quote_block! {
#wrapper
_serde::export::Result::map(
_serde::de::VariantVisitor::visit_newtype::<#wrapper_ty>(__visitor),
|__wrapper| #ident::#variant_ident(__wrapper.value))
|__wrapper| #this::#variant_ident(__wrapper.value))
}
}
}
}
fn deserialize_untagged_newtype_variant(ident: &syn::Ident,
variant_ident: &syn::Ident,
fn deserialize_untagged_newtype_variant(variant_ident: &syn::Ident,
params: &Parameters,
field: &Field,
deserializer: Tokens)
-> Fragment {
let this = &params.this;
match field.attrs.deserialize_with() {
None => {
let field_ty = &field.ty;
quote_expr! {
_serde::export::Result::map(
<#field_ty as _serde::Deserialize>::deserialize(#deserializer),
#ident::#variant_ident)
#this::#variant_ident)
}
}
Some(path) => {
let (wrapper, wrapper_ty) =
wrap_deserialize_with(ident, params, field.ty, path);
wrap_deserialize_with(params, field.ty, path);
quote_block! {
#wrapper
_serde::export::Result::map(
<#wrapper_ty as _serde::Deserialize>::deserialize(#deserializer),
|__wrapper| #ident::#variant_ident(__wrapper.value))
|__wrapper| #this::#variant_ident(__wrapper.value))
}
}
}
@@ -1196,8 +1280,7 @@ fn deserialize_field_visitor(fields: Vec<(String, Ident)>,
}
}
fn deserialize_struct_visitor(ident: &syn::Ident,
struct_path: Tokens,
fn deserialize_struct_visitor(struct_path: Tokens,
params: &Parameters,
fields: &[Field],
item_attrs: &attr::Item)
@@ -1217,13 +1300,12 @@ fn deserialize_struct_visitor(ident: &syn::Ident,
let field_visitor = deserialize_field_visitor(field_names_idents, item_attrs, false);
let visit_map = deserialize_map(ident, struct_path, params, fields, item_attrs);
let visit_map = deserialize_map(struct_path, params, fields, item_attrs);
(field_visitor, fields_stmt, visit_map)
}
fn deserialize_map(ident: &syn::Ident,
struct_path: Tokens,
fn deserialize_map(struct_path: Tokens,
params: &Parameters,
fields: &[Field],
item_attrs: &attr::Item)
@@ -1259,7 +1341,7 @@ fn deserialize_map(ident: &syn::Ident,
}
Some(path) => {
let (wrapper, wrapper_ty) = wrap_deserialize_with(
ident, params, field.ty, path);
params, field.ty, path);
quote!({
#wrapper
try!(_serde::de::MapVisitor::visit_value::<#wrapper_ty>(&mut __visitor)).value
@@ -1347,6 +1429,14 @@ fn deserialize_map(ident: &syn::Ident,
}
};
let mut result = quote!(#struct_path { #(#result),* });
if params.has_getter {
let this = &params.this;
result = quote! {
_serde::export::Into::<#this>::into(#result)
};
}
quote_block! {
#(#let_values)*
@@ -1356,7 +1446,7 @@ fn deserialize_map(ident: &syn::Ident,
#(#extract_values)*
_serde::export::Ok(#struct_path { #(#result),* })
_serde::export::Ok(#result)
}
}
@@ -1366,17 +1456,17 @@ fn field_i(i: usize) -> Ident {
/// This function wraps the expression in `#[serde(deserialize_with = "...")]`
/// in a trait to prevent it from accessing the internal `Deserialize` state.
fn wrap_deserialize_with(ident: &syn::Ident,
params: &Parameters,
fn wrap_deserialize_with(params: &Parameters,
field_ty: &syn::Ty,
deserialize_with: &syn::Path)
-> (Tokens, Tokens) {
let this = &params.this;
let (de_impl_generics, de_ty_generics, ty_generics, where_clause) = split_with_de_lifetime(params);
let wrapper = quote! {
struct __DeserializeWith #de_impl_generics #where_clause {
value: #field_ty,
phantom: _serde::export::PhantomData<#ident #ty_generics>,
phantom: _serde::export::PhantomData<#this #ty_generics>,
lifetime: _serde::export::PhantomData<&'de ()>,
}
@@ -1437,11 +1527,7 @@ struct DeImplGenerics<'a>(&'a Parameters);
impl<'a> ToTokens for DeImplGenerics<'a> {
fn to_tokens(&self, tokens: &mut Tokens) {
let mut generics = self.0.generics.clone();
generics.lifetimes.insert(0, syn::LifetimeDef {
attrs: Vec::new(),
lifetime: syn::Lifetime::new("'de"),
bounds: self.0.borrowed.iter().cloned().collect(),
});
generics.lifetimes.insert(0, self.0.de_lifetime_def());
let (impl_generics, _, _) = generics.split_for_impl();
impl_generics.to_tokens(tokens);
}
serde_derive/src/ser.rs
+174 -106
View File
@@ -14,15 +14,23 @@ pub fn expand_derive_serialize(item: &syn::DeriveInput) -> Result<Tokens, String
try!(ctxt.check());
let ident = &item.ident;
let generics = build_generics(&item);
let (impl_generics, ty_generics, where_clause) = generics.split_for_impl();
let params = Parameters::new(&item);
let (impl_generics, ty_generics, where_clause) = params.generics.split_for_impl();
let dummy_const = Ident::new(format!("_IMPL_SERIALIZE_FOR_{}", ident));
let body = Stmts(serialize_body(&item, &generics));
let body = Stmts(serialize_body(&item, &params));
Ok(quote! {
#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
const #dummy_const: () = {
extern crate serde as _serde;
let impl_item = if let Some(remote) = item.attrs.remote() {
quote! {
impl #impl_generics #ident #ty_generics #where_clause {
fn serialize<__S>(__self: &#remote #ty_generics, __serializer: __S) -> _serde::export::Result<__S::Ok, __S::Error>
where __S: _serde::Serializer
{
#body
}
}
}
} else {
quote! {
#[automatically_derived]
impl #impl_generics _serde::Serialize for #ident #ty_generics #where_clause {
fn serialize<__S>(&self, __serializer: __S) -> _serde::export::Result<__S::Ok, __S::Error>
@@ -31,10 +39,66 @@ pub fn expand_derive_serialize(item: &syn::DeriveInput) -> Result<Tokens, String
#body
}
}
}
};
Ok(quote! {
#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
const #dummy_const: () = {
extern crate serde as _serde;
#impl_item
};
})
}
struct Parameters {
/// Variable holding the value being serialized. Either `self` for local
/// types or `__self` for remote types.
self_var: Ident,
/// Path to the type the impl is for. Either a single `Ident` for local
/// types or `some::remote::Ident` for remote types. Does not include
/// generic parameters.
this: syn::Path,
/// Generics including any explicit and inferred bounds for the impl.
generics: syn::Generics,
/// Type has a `serde(remote = "...")` attribute.
is_remote: bool,
}
impl Parameters {
fn new(item: &Item) -> Self {
let is_remote = item.attrs.remote().is_some();
let self_var = if is_remote {
Ident::new("__self")
} else {
Ident::new("self")
};
let this = match item.attrs.remote() {
Some(remote) => remote.clone(),
None => item.ident.clone().into(),
};
let generics = build_generics(item);
Parameters {
self_var: self_var,
this: this,
generics: generics,
is_remote: is_remote,
}
}
/// Type name to use in error messages and `&'static str` arguments to
/// various Serializer methods.
fn type_name(&self) -> &str {
self.this.segments.last().unwrap().ident.as_ref()
}
}
// All the generics in the input, plus a bound `T: Serialize` for each generic
// field type that will be serialized by us.
fn build_generics(item: &Item) -> syn::Generics {
@@ -62,38 +126,39 @@ fn needs_serialize_bound(attrs: &attr::Field) -> bool {
!attrs.skip_serializing() && attrs.serialize_with().is_none() && attrs.ser_bound().is_none()
}
fn serialize_body(item: &Item, generics: &syn::Generics) -> Fragment {
fn serialize_body(item: &Item, params: &Parameters) -> Fragment {
if let Some(into_type) = item.attrs.into_type() {
serialize_into(into_type)
serialize_into(params, into_type)
} else {
match item.body {
Body::Enum(ref variants) => {
serialize_item_enum(&item.ident, generics, variants, &item.attrs)
serialize_item_enum(params, variants, &item.attrs)
}
Body::Struct(Style::Struct, ref fields) => {
if fields.iter().any(|field| field.ident.is_none()) {
panic!("struct has unnamed fields");
}
serialize_struct(&item.ident, generics, fields, &item.attrs)
serialize_struct(params, fields, &item.attrs)
}
Body::Struct(Style::Tuple, ref fields) => {
if fields.iter().any(|field| field.ident.is_some()) {
panic!("tuple struct has named fields");
}
serialize_tuple_struct(&item.ident, generics, fields, &item.attrs)
serialize_tuple_struct(params, fields, &item.attrs)
}
Body::Struct(Style::Newtype, ref fields) => {
serialize_newtype_struct(&item.ident, generics, &fields[0], &item.attrs)
serialize_newtype_struct(params, &fields[0], &item.attrs)
}
Body::Struct(Style::Unit, _) => serialize_unit_struct(&item.attrs),
}
}
}
fn serialize_into(into_type: &syn::Ty) -> Fragment {
fn serialize_into(params: &Parameters, into_type: &syn::Ty) -> Fragment {
let self_var = &params.self_var;
quote_block! {
_serde::Serialize::serialize(
&<Self as _serde::export::Into<#into_type>>::into(_serde::export::Clone::clone(self)),
&_serde::export::Into::<#into_type>::into(_serde::export::Clone::clone(#self_var)),
__serializer)
}
}
@@ -106,16 +171,15 @@ fn serialize_unit_struct(item_attrs: &attr::Item) -> Fragment {
}
}
fn serialize_newtype_struct(ident: &syn::Ident,
generics: &syn::Generics,
fn serialize_newtype_struct(params: &Parameters,
field: &Field,
item_attrs: &attr::Item)
-> Fragment {
let type_name = item_attrs.name().serialize_name();
let mut field_expr = quote!(&self.0);
let mut field_expr = get_field(params, field, 0);
if let Some(path) = field.attrs.serialize_with() {
field_expr = wrap_serialize_with(ident, generics, field.ty, path, field_expr);
field_expr = wrap_serialize_with(params, field.ty, path, field_expr);
}
quote_expr! {
@@ -123,15 +187,13 @@ fn serialize_newtype_struct(ident: &syn::Ident,
}
}
fn serialize_tuple_struct(ident: &syn::Ident,
generics: &syn::Generics,
fn serialize_tuple_struct(params: &Parameters,
fields: &[Field],
item_attrs: &attr::Item)
-> Fragment {
let serialize_stmts =
serialize_tuple_struct_visitor(ident,
fields,
generics,
serialize_tuple_struct_visitor(fields,
params,
false,
quote!(_serde::ser::SerializeTupleStruct::serialize_field));
@@ -146,17 +208,15 @@ fn serialize_tuple_struct(ident: &syn::Ident,
}
}
fn serialize_struct(ident: &syn::Ident,
generics: &syn::Generics,
fn serialize_struct(params: &Parameters,
fields: &[Field],
item_attrs: &attr::Item)
-> Fragment {
assert!(fields.len() as u64 <= u32::MAX as u64);
let serialize_fields =
serialize_struct_visitor(ident,
fields,
generics,
serialize_struct_visitor(fields,
params,
false,
quote!(_serde::ser::SerializeStruct::serialize_field));
@@ -169,12 +229,13 @@ fn serialize_struct(ident: &syn::Ident,
let let_mut = mut_if(serialized_fields.peek().is_some());
let len = serialized_fields.map(|field| {
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!(if #path(#field_expr) { 0 } else { 1 }),
None => quote!(1),
Some(path) => {
let ident = field.ident.clone().expect("struct has unnamed fields");
let field_expr = get_field(params, field, ident);
quote!(if #path(#field_expr) { 0 } else { 1 })
}
}
})
.fold(quote!(0), |sum, expr| quote!(#sum + #expr));
@@ -186,18 +247,18 @@ fn serialize_struct(ident: &syn::Ident,
}
}
fn serialize_item_enum(ident: &syn::Ident,
generics: &syn::Generics,
fn serialize_item_enum(params: &Parameters,
variants: &[Variant],
item_attrs: &attr::Item)
-> Fragment {
assert!(variants.len() as u64 <= u32::MAX as u64);
let self_var = &params.self_var;
let arms: Vec<_> = variants.iter()
.enumerate()
.map(|(variant_index, variant)| {
serialize_variant(ident,
generics,
serialize_variant(params,
variant,
variant_index as u32,
item_attrs)
@@ -205,23 +266,23 @@ fn serialize_item_enum(ident: &syn::Ident,
.collect();
quote_expr! {
match *self {
match *#self_var {
#(#arms)*
}
}
}
fn serialize_variant(ident: &syn::Ident,
generics: &syn::Generics,
fn serialize_variant(params: &Parameters,
variant: &Variant,
variant_index: u32,
item_attrs: &attr::Item)
-> Tokens {
let this = &params.this;
let variant_ident = variant.ident.clone();
if variant.attrs.skip_serializing() {
let skipped_msg = format!("the enum variant {}::{} cannot be serialized",
ident, variant_ident);
params.type_name(), variant_ident);
let skipped_err = quote! {
_serde::export::Err(_serde::ser::Error::custom(#skipped_msg))
};
@@ -231,26 +292,26 @@ fn serialize_variant(ident: &syn::Ident,
Style::Struct => quote!( {..} ),
};
quote! {
#ident::#variant_ident #fields_pat => #skipped_err,
#this::#variant_ident #fields_pat => #skipped_err,
}
} else {
// variant wasn't skipped
let case = match variant.style {
Style::Unit => {
quote! {
#ident::#variant_ident
#this::#variant_ident
}
}
Style::Newtype => {
quote! {
#ident::#variant_ident(ref __field0)
#this::#variant_ident(ref __field0)
}
}
Style::Tuple => {
let field_names = (0..variant.fields.len())
.map(|i| Ident::new(format!("__field{}", i)));
quote! {
#ident::#variant_ident(#(ref #field_names),*)
#this::#variant_ident(#(ref #field_names),*)
}
}
Style::Struct => {
@@ -258,35 +319,32 @@ fn serialize_variant(ident: &syn::Ident,
.iter()
.map(|f| f.ident.clone().expect("struct variant has unnamed fields"));
quote! {
#ident::#variant_ident { #(ref #fields),* }
#this::#variant_ident { #(ref #fields),* }
}
}
};
let body = Match(match *item_attrs.tag() {
attr::EnumTag::External => {
serialize_externally_tagged_variant(ident,
generics,
serialize_externally_tagged_variant(params,
variant,
variant_index,
item_attrs)
}
attr::EnumTag::Internal { ref tag } => {
serialize_internally_tagged_variant(ident,
generics,
serialize_internally_tagged_variant(params,
variant,
item_attrs,
tag)
}
attr::EnumTag::Adjacent { ref tag, ref content } => {
serialize_adjacently_tagged_variant(ident,
generics,
serialize_adjacently_tagged_variant(params,
variant,
item_attrs,
tag,
content)
}
attr::EnumTag::None => serialize_untagged_variant(ident, generics, variant, item_attrs),
attr::EnumTag::None => serialize_untagged_variant(params, variant, item_attrs),
});
quote! {
@@ -295,8 +353,7 @@ fn serialize_variant(ident: &syn::Ident,
}
}
fn serialize_externally_tagged_variant(ident: &syn::Ident,
generics: &syn::Generics,
fn serialize_externally_tagged_variant(params: &Parameters,
variant: &Variant,
variant_index: u32,
item_attrs: &attr::Item)
@@ -319,7 +376,7 @@ fn serialize_externally_tagged_variant(ident: &syn::Ident,
let field = &variant.fields[0];
let mut field_expr = quote!(__field0);
if let Some(path) = field.attrs.serialize_with() {
field_expr = wrap_serialize_with(ident, generics, field.ty, path, field_expr);
field_expr = wrap_serialize_with(params, field.ty, path, field_expr);
}
quote_expr! {
@@ -338,8 +395,7 @@ fn serialize_externally_tagged_variant(ident: &syn::Ident,
variant_index: variant_index,
variant_name: variant_name,
},
ident,
generics,
params,
&variant.fields)
}
Style::Struct => {
@@ -347,16 +403,14 @@ fn serialize_externally_tagged_variant(ident: &syn::Ident,
variant_index: variant_index,
variant_name: variant_name,
},
ident,
generics,
params,
&variant.fields,
&type_name)
}
}
}
fn serialize_internally_tagged_variant(ident: &syn::Ident,
generics: &syn::Generics,
fn serialize_internally_tagged_variant(params: &Parameters,
variant: &Variant,
item_attrs: &attr::Item,
tag: &str)
@@ -364,7 +418,7 @@ fn serialize_internally_tagged_variant(ident: &syn::Ident,
let type_name = item_attrs.name().serialize_name();
let variant_name = variant.attrs.name().serialize_name();
let enum_ident_str = ident.as_ref();
let enum_ident_str = params.type_name();
let variant_ident_str = variant.ident.as_ref();
match variant.style {
@@ -381,7 +435,7 @@ fn serialize_internally_tagged_variant(ident: &syn::Ident,
let field = &variant.fields[0];
let mut field_expr = quote!(__field0);
if let Some(path) = field.attrs.serialize_with() {
field_expr = wrap_serialize_with(ident, generics, field.ty, path, field_expr);
field_expr = wrap_serialize_with(params, field.ty, path, field_expr);
}
quote_expr! {
@@ -400,8 +454,7 @@ fn serialize_internally_tagged_variant(ident: &syn::Ident,
tag: tag,
variant_name: variant_name,
},
ident,
generics,
params,
&variant.fields,
&type_name)
}
@@ -409,13 +462,13 @@ fn serialize_internally_tagged_variant(ident: &syn::Ident,
}
}
fn serialize_adjacently_tagged_variant(ident: &syn::Ident,
generics: &syn::Generics,
fn serialize_adjacently_tagged_variant(params: &Parameters,
variant: &Variant,
item_attrs: &attr::Item,
tag: &str,
content: &str)
-> Fragment {
let this = &params.this;
let type_name = item_attrs.name().serialize_name();
let variant_name = variant.attrs.name().serialize_name();
@@ -433,7 +486,7 @@ fn serialize_adjacently_tagged_variant(ident: &syn::Ident,
let field = &variant.fields[0];
let mut field_expr = quote!(__field0);
if let Some(path) = field.attrs.serialize_with() {
field_expr = wrap_serialize_with(ident, generics, field.ty, path, field_expr);
field_expr = wrap_serialize_with(params, field.ty, path, field_expr);
}
quote_expr! {
@@ -442,14 +495,12 @@ fn serialize_adjacently_tagged_variant(ident: &syn::Ident,
}
Style::Tuple => {
serialize_tuple_variant(TupleVariant::Untagged,
ident,
generics,
params,
&variant.fields)
}
Style::Struct => {
serialize_struct_variant(StructVariant::Untagged,
ident,
generics,
params,
&variant.fields,
&variant_name)
}
@@ -472,15 +523,15 @@ fn serialize_adjacently_tagged_variant(ident: &syn::Ident,
}
};
let (_, ty_generics, where_clause) = generics.split_for_impl();
let (_, ty_generics, where_clause) = params.generics.split_for_impl();
let wrapper_generics = bound::with_lifetime_bound(generics, "'__a");
let wrapper_generics = bound::with_lifetime_bound(&params.generics, "'__a");
let (wrapper_impl_generics, wrapper_ty_generics, _) = wrapper_generics.split_for_impl();
quote_block! {
struct __AdjacentlyTagged #wrapper_generics #where_clause {
data: (#(&'__a #fields_ty,)*),
phantom: _serde::export::PhantomData<#ident #ty_generics>,
phantom: _serde::export::PhantomData<#this #ty_generics>,
}
impl #wrapper_impl_generics _serde::Serialize for __AdjacentlyTagged #wrapper_ty_generics #where_clause {
@@ -499,14 +550,13 @@ fn serialize_adjacently_tagged_variant(ident: &syn::Ident,
try!(_serde::ser::SerializeStruct::serialize_field(
&mut __struct, #content, &__AdjacentlyTagged {
data: (#(#fields_ident,)*),
phantom: _serde::export::PhantomData::<#ident #ty_generics>,
phantom: _serde::export::PhantomData::<#this #ty_generics>,
}));
_serde::ser::SerializeStruct::end(__struct)
}
}
fn serialize_untagged_variant(ident: &syn::Ident,
generics: &syn::Generics,
fn serialize_untagged_variant(params: &Parameters,
variant: &Variant,
item_attrs: &attr::Item)
-> Fragment {
@@ -520,7 +570,7 @@ fn serialize_untagged_variant(ident: &syn::Ident,
let field = &variant.fields[0];
let mut field_expr = quote!(__field0);
if let Some(path) = field.attrs.serialize_with() {
field_expr = wrap_serialize_with(ident, generics, field.ty, path, field_expr);
field_expr = wrap_serialize_with(params, field.ty, path, field_expr);
}
quote_expr! {
@@ -528,13 +578,12 @@ fn serialize_untagged_variant(ident: &syn::Ident,
}
}
Style::Tuple => {
serialize_tuple_variant(TupleVariant::Untagged, ident, generics, &variant.fields)
serialize_tuple_variant(TupleVariant::Untagged, params, &variant.fields)
}
Style::Struct => {
let type_name = item_attrs.name().serialize_name();
serialize_struct_variant(StructVariant::Untagged,
ident,
generics,
params,
&variant.fields,
&type_name)
}
@@ -551,8 +600,7 @@ enum TupleVariant {
}
fn serialize_tuple_variant(context: TupleVariant,
ident: &syn::Ident,
generics: &syn::Generics,
params: &Parameters,
fields: &[Field])
-> Fragment {
let method = match context {
@@ -563,7 +611,7 @@ fn serialize_tuple_variant(context: TupleVariant,
};
let serialize_stmts =
serialize_tuple_struct_visitor(ident, fields, generics, true, method);
serialize_tuple_struct_visitor(fields, params, true, method);
let len = serialize_stmts.len();
let let_mut = mut_if(len > 0);
@@ -603,8 +651,7 @@ enum StructVariant<'a> {
}
fn serialize_struct_variant<'a>(context: StructVariant<'a>,
ident: &syn::Ident,
generics: &syn::Generics,
params: &Parameters,
fields: &[Field],
name: &str)
-> Fragment {
@@ -616,7 +663,7 @@ fn serialize_struct_variant<'a>(context: StructVariant<'a>,
StructVariant::Untagged => quote!(_serde::ser::SerializeStruct::serialize_field),
};
let serialize_fields = serialize_struct_visitor(ident, fields, generics, true, method);
let serialize_fields = serialize_struct_visitor(fields, params, true, method);
let mut serialized_fields = fields.iter()
.filter(|&field| !field.attrs.skip_serializing())
@@ -678,9 +725,8 @@ fn serialize_struct_variant<'a>(context: StructVariant<'a>,
}
}
fn serialize_tuple_struct_visitor(ident: &syn::Ident,
fields: &[Field],
generics: &syn::Generics,
fn serialize_tuple_struct_visitor(fields: &[Field],
params: &Parameters,
is_enum: bool,
func: Tokens)
-> Vec<Tokens> {
@@ -691,8 +737,7 @@ fn serialize_tuple_struct_visitor(ident: &syn::Ident,
let id = Ident::new(format!("__field{}", i));
quote!(#id)
} else {
let i = Ident::new(i);
quote!(&self.#i)
get_field(params, field, i)
};
let skip = field.attrs
@@ -701,7 +746,7 @@ fn serialize_tuple_struct_visitor(ident: &syn::Ident,
if let Some(path) = field.attrs.serialize_with() {
field_expr =
wrap_serialize_with(ident, generics, field.ty, path, field_expr);
wrap_serialize_with(params, field.ty, path, field_expr);
}
let ser = quote! {
@@ -716,9 +761,8 @@ fn serialize_tuple_struct_visitor(ident: &syn::Ident,
.collect()
}
fn serialize_struct_visitor(ident: &syn::Ident,
fields: &[Field],
generics: &syn::Generics,
fn serialize_struct_visitor(fields: &[Field],
params: &Parameters,
is_enum: bool,
func: Tokens)
-> Vec<Tokens> {
@@ -729,7 +773,7 @@ fn serialize_struct_visitor(ident: &syn::Ident,
let mut field_expr = if is_enum {
quote!(#field_ident)
} else {
quote!(&self.#field_ident)
get_field(params, field, field_ident)
};
let key_expr = field.attrs.name().serialize_name();
@@ -740,7 +784,7 @@ fn serialize_struct_visitor(ident: &syn::Ident,
if let Some(path) = field.attrs.serialize_with() {
field_expr =
wrap_serialize_with(ident, generics, field.ty, path, field_expr)
wrap_serialize_with(params, field.ty, path, field_expr)
}
let ser = quote! {
@@ -755,21 +799,21 @@ fn serialize_struct_visitor(ident: &syn::Ident,
.collect()
}
fn wrap_serialize_with(ident: &syn::Ident,
generics: &syn::Generics,
fn wrap_serialize_with(params: &Parameters,
field_ty: &syn::Ty,
serialize_with: &syn::Path,
value: Tokens)
-> Tokens {
let (_, ty_generics, where_clause) = generics.split_for_impl();
let this = &params.this;
let (_, ty_generics, where_clause) = params.generics.split_for_impl();
let wrapper_generics = bound::with_lifetime_bound(generics, "'__a");
let wrapper_generics = bound::with_lifetime_bound(&params.generics, "'__a");
let (wrapper_impl_generics, wrapper_ty_generics, _) = wrapper_generics.split_for_impl();
quote!({
struct __SerializeWith #wrapper_impl_generics #where_clause {
value: &'__a #field_ty,
phantom: _serde::export::PhantomData<#ident #ty_generics>,
phantom: _serde::export::PhantomData<#this #ty_generics>,
}
impl #wrapper_impl_generics _serde::Serialize for __SerializeWith #wrapper_ty_generics #where_clause {
@@ -782,7 +826,7 @@ fn wrap_serialize_with(ident: &syn::Ident,
&__SerializeWith {
value: #value,
phantom: _serde::export::PhantomData::<#ident #ty_generics>,
phantom: _serde::export::PhantomData::<#this #ty_generics>,
}
})
}
@@ -796,3 +840,27 @@ fn wrap_serialize_with(ident: &syn::Ident,
fn mut_if(is_mut: bool) -> Option<Tokens> {
if is_mut { Some(quote!(mut)) } else { None }
}
fn get_field<I>(params: &Parameters, field: &Field, ident: I) -> Tokens
where I: Into<Ident>
{
let self_var = &params.self_var;
match (params.is_remote, field.attrs.getter()) {
(false, None) => {
let ident = ident.into();
quote!(&#self_var.#ident)
}
(true, None) => {
let ty = field.ty;
let ident = ident.into();
quote!(_serde::private::ser::constrain::<#ty>(&#self_var.#ident))
}
(true, Some(getter)) => {
let ty = field.ty;
quote!(_serde::private::ser::constrain::<#ty>(&#getter(#self_var)))
}
(false, Some(_)) => {
unreachable!("getter is only allowed for remote impls");
}
}
}