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Remove unnecessary nesting fron generated Deserialize implementations

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This commit is contained in:
David Tolnay
2016-08-03 21:08:17 -07:00
parent 69de46f9e0
commit c539563687
1 changed files with 55 additions and 69 deletions
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serde_codegen/src/de.rs
+55 -69
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@@ -76,10 +76,8 @@ fn deserialize_item(
#[automatically_derived]
impl $impl_generics _serde::de::Deserialize for $ty $where_clause {
fn deserialize<__D>(deserializer: &mut __D) -> ::std::result::Result<$ty, __D::Error>
where __D: _serde::de::Deserializer,
{
$body
}
where __D: _serde::de::Deserializer
$body
}
};
).unwrap()
@@ -136,7 +134,7 @@ fn deserialize_body(
item: &Item,
impl_generics: &ast::Generics,
ty: P<ast::Ty>,
) -> P<ast::Expr> {
) -> P<ast::Block> {
match item.body {
Body::Enum(ref variants) => {
deserialize_item_enum(
@@ -274,10 +272,10 @@ fn deserialize_unit_struct(
builder: &aster::AstBuilder,
type_ident: Ident,
item_attrs: &attr::Item,
) -> P<ast::Expr> {
) -> P<ast::Block> {
let type_name = name_expr(builder, item_attrs.name());
quote_expr!(cx, {
quote_block!(cx, {
struct __Visitor;
impl _serde::de::Visitor for __Visitor {
@@ -300,7 +298,7 @@ fn deserialize_unit_struct(
}
deserializer.deserialize_unit_struct($type_name, __Visitor)
})
}).unwrap()
}
fn deserialize_tuple(
@@ -312,7 +310,7 @@ fn deserialize_tuple(
ty: P<ast::Ty>,
fields: &[Field],
item_attrs: &attr::Item,
) -> P<ast::Expr> {
) -> P<ast::Block> {
let where_clause = &impl_generics.where_clause;
let (visitor_item, visitor_ty, visitor_expr, visitor_generics) = deserialize_visitor(
@@ -343,7 +341,7 @@ fn deserialize_tuple(
None
};
let visit_seq_expr = deserialize_seq(
let visit_seq = deserialize_seq(
cx,
builder,
type_ident,
@@ -366,7 +364,7 @@ fn deserialize_tuple(
deserializer.deserialize_tuple_struct($type_name, $nfields, $visitor_expr))
};
quote_expr!(cx, {
quote_block!(cx, {
$visitor_item
impl $visitor_generics _serde::de::Visitor for $visitor_ty $where_clause {
@@ -376,14 +374,12 @@ fn deserialize_tuple(
#[inline]
fn visit_seq<__V>(&mut self, mut visitor: __V) -> ::std::result::Result<$ty, __V::Error>
where __V: _serde::de::SeqVisitor,
{
$visit_seq_expr
}
where __V: _serde::de::SeqVisitor
$visit_seq
}
$dispatch
})
}).unwrap()
}
fn deserialize_seq(
@@ -394,7 +390,7 @@ fn deserialize_seq(
impl_generics: &ast::Generics,
fields: &[Field],
is_struct: bool,
) -> P<ast::Expr> {
) -> P<ast::Block> {
let mut index_in_seq = 0usize;
let let_values: Vec<_> = fields.iter()
.enumerate()
@@ -461,13 +457,13 @@ fn deserialize_seq(
.build()
};
quote_expr!(cx, {
quote_block!(cx, {
$let_values
try!(visitor.end());
Ok($result)
})
}).unwrap()
}
fn deserialize_newtype_struct(
@@ -513,7 +509,7 @@ fn deserialize_struct(
ty: P<ast::Ty>,
fields: &[Field],
item_attrs: &attr::Item,
) -> P<ast::Expr> {
) -> P<ast::Block> {
let where_clause = &impl_generics.where_clause;
let (visitor_item, visitor_ty, visitor_expr, visitor_generics) = deserialize_visitor(
@@ -528,7 +524,7 @@ fn deserialize_struct(
None => builder.path().id(type_ident).build(),
};
let visit_seq_expr = deserialize_seq(
let visit_seq = deserialize_seq(
cx,
builder,
type_ident,
@@ -538,7 +534,7 @@ fn deserialize_struct(
true,
);
let (field_visitor, fields_stmt, visit_map_expr) = deserialize_struct_visitor(
let (field_visitor, fields_stmt, visit_map) = deserialize_struct_visitor(
cx,
builder,
type_ident,
@@ -558,7 +554,7 @@ fn deserialize_struct(
deserializer.deserialize_struct($type_name, FIELDS, $visitor_expr))
};
quote_expr!(cx, {
quote_block!(cx, {
$field_visitor
$visitor_item
@@ -568,23 +564,19 @@ fn deserialize_struct(
#[inline]
fn visit_seq<__V>(&mut self, mut visitor: __V) -> ::std::result::Result<$ty, __V::Error>
where __V: _serde::de::SeqVisitor,
{
$visit_seq_expr
}
where __V: _serde::de::SeqVisitor
$visit_seq
#[inline]
fn visit_map<__V>(&mut self, mut visitor: __V) -> ::std::result::Result<$ty, __V::Error>
where __V: _serde::de::MapVisitor,
{
$visit_map_expr
}
where __V: _serde::de::MapVisitor
$visit_map
}
$fields_stmt
$dispatch
})
}).unwrap()
}
fn deserialize_item_enum(
@@ -595,7 +587,7 @@ fn deserialize_item_enum(
ty: P<ast::Ty>,
variants: &[Variant],
item_attrs: &attr::Item
) -> P<ast::Expr> {
) -> P<ast::Block> {
let where_clause = &impl_generics.where_clause;
let type_name = name_expr(builder, item_attrs.name());
@@ -633,7 +625,7 @@ fn deserialize_item_enum(
.id("__Field").id(format!("__field{}", i))
.build();
let expr = deserialize_variant(
let block = deserialize_variant(
cx,
builder,
type_ident,
@@ -643,7 +635,7 @@ fn deserialize_item_enum(
item_attrs,
);
let arm = quote_arm!(cx, $variant_name => { $expr });
let arm = quote_arm!(cx, $variant_name => $block);
variant_arms.push(arm);
}
variant_arms.extend(ignored_arm.into_iter());
@@ -655,7 +647,7 @@ fn deserialize_item_enum(
vec![deserializer_ty_arg(builder)],
);
quote_expr!(cx, {
quote_block!(cx, {
$variant_visitor
$visitor_item
@@ -675,7 +667,7 @@ fn deserialize_item_enum(
$variants_stmt
deserializer.deserialize_enum($type_name, VARIANTS, $visitor_expr)
})
}).unwrap()
}
fn deserialize_variant(
@@ -686,15 +678,15 @@ fn deserialize_variant(
ty: P<ast::Ty>,
variant: &Variant,
item_attrs: &attr::Item,
) -> P<ast::Expr> {
) -> P<ast::Block> {
let variant_ident = variant.ident;
match variant.style {
Style::Unit => {
quote_expr!(cx, {
quote_block!(cx, {
try!(visitor.visit_unit());
Ok($type_ident::$variant_ident)
})
}).unwrap()
}
Style::Newtype => {
deserialize_newtype_variant(
@@ -740,7 +732,7 @@ fn deserialize_newtype_variant(
variant_ident: Ident,
impl_generics: &ast::Generics,
field: &Field,
) -> P<ast::Expr> {
) -> P<ast::Block> {
let visit = match field.attrs.deserialize_with() {
None => {
let field_ty = &field.ty;
@@ -756,7 +748,9 @@ fn deserialize_newtype_variant(
})
}
};
quote_expr!(cx, Ok($type_ident::$variant_ident($visit)))
quote_block!(cx, {
Ok($type_ident::$variant_ident($visit))
}).unwrap()
}
fn deserialize_field_visitor(
@@ -805,17 +799,15 @@ fn deserialize_field_visitor(
let fallthrough_index_arm_expr = if !is_variant && !item_attrs.deny_unknown_fields() {
quote_expr!(cx, Ok(__Field::__ignore))
} else {
quote_expr!(cx, {
Err(_serde::de::Error::invalid_value($index_error_msg))
})
quote_expr!(cx, Err(_serde::de::Error::invalid_value($index_error_msg)))
};
let index_body = quote_expr!(cx,
let index_body = quote_block!(cx, {
match value {
$index_field_arms
_ => $fallthrough_index_arm_expr
}
);
}).unwrap();
// Convert the field names into byte strings.
let str_field_names: Vec<_> = field_names.iter()
@@ -835,12 +827,12 @@ fn deserialize_field_visitor(
quote_expr!(cx, Err(_serde::de::Error::$unknown_ident(value)))
};
let str_body = quote_expr!(cx,
let str_body = quote_block!(cx, {
match value {
$str_field_arms
_ => $fallthrough_str_arm_expr
}
);
}).unwrap();
// Convert the field names into byte strings.
let bytes_field_names: Vec<_> = field_names.iter()
@@ -866,12 +858,12 @@ fn deserialize_field_visitor(
})
};
let bytes_body = quote_expr!(cx,
let bytes_body = quote_block!(cx, {
match value {
$bytes_field_arms
_ => $fallthrough_bytes_arm_expr
}
);
}).unwrap();
let impl_item = quote_item!(cx,
impl _serde::de::Deserialize for __Field {
@@ -889,22 +881,16 @@ fn deserialize_field_visitor(
type Value = __Field;
fn visit_usize<__E>(&mut self, value: usize) -> ::std::result::Result<__Field, __E>
where __E: _serde::de::Error,
{
$index_body
}
where __E: _serde::de::Error
$index_body
fn visit_str<__E>(&mut self, value: &str) -> ::std::result::Result<__Field, __E>
where __E: _serde::de::Error,
{
$str_body
}
where __E: _serde::de::Error
$str_body
fn visit_bytes<__E>(&mut self, value: &[u8]) -> ::std::result::Result<__Field, __E>
where __E: _serde::de::Error,
{
$bytes_body
}
where __E: _serde::de::Error
$bytes_body
}
deserializer.deserialize_struct_field(
@@ -927,7 +913,7 @@ fn deserialize_struct_visitor(
impl_generics: &ast::Generics,
fields: &[Field],
item_attrs: &attr::Item,
) -> (Vec<P<ast::Item>>, ast::Stmt, P<ast::Expr>) {
) -> (Vec<P<ast::Item>>, ast::Stmt, P<ast::Block>) {
let field_exprs = fields.iter()
.map(|field| field.attrs.name().deserialize_name())
.collect();
@@ -940,7 +926,7 @@ fn deserialize_struct_visitor(
false,
);
let visit_map_expr = deserialize_map(
let visit_map = deserialize_map(
cx,
builder,
type_ident,
@@ -968,7 +954,7 @@ fn deserialize_struct_visitor(
const FIELDS: &'static [&'static str] = $fields_expr;
).unwrap();
(field_visitor, fields_stmt, visit_map_expr)
(field_visitor, fields_stmt, visit_map)
}
fn deserialize_map(
@@ -979,7 +965,7 @@ fn deserialize_map(
impl_generics: &ast::Generics,
fields: &[Field],
item_attrs: &attr::Item,
) -> P<ast::Expr> {
) -> P<ast::Block> {
// Create the field names for the fields.
let fields_names = fields.iter()
.enumerate()
@@ -1086,7 +1072,7 @@ fn deserialize_map(
)
.build();
quote_expr!(cx, {
quote_block!(cx, {
$let_values
while let Some(key) = try!(visitor.visit_key::<__Field>()) {
@@ -1102,7 +1088,7 @@ fn deserialize_map(
$extract_values
Ok($result)
})
}).unwrap()
}
/// This function wraps the expression in `#[serde(deserialize_with="...")]` in