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This commit is contained in:
David Tolnay
2017-02-12 21:59:04 -08:00
parent 964a2dd4d1
commit e8651a52e7
24 changed files with 1220 additions and 1443 deletions
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serde_codegen_internals/src/attr.rs
+37 -34
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@@ -157,7 +157,8 @@ impl Item {
// Parse `#[serde(bound="D: Serialize")]`
MetaItem(NameValue(ref name, ref lit)) if name == "bound" => {
if let Ok(where_predicates) = parse_lit_into_where(cx, name.as_ref(), name.as_ref(), lit) {
if let Ok(where_predicates) =
parse_lit_into_where(cx, name.as_ref(), name.as_ref(), lit) {
ser_bound.set(where_predicates.clone());
de_bound.set(where_predicates);
}
@@ -217,10 +218,12 @@ impl Item {
if let syn::Body::Enum(ref variants) = item.body {
for variant in variants {
match variant.data {
syn::VariantData::Struct(_) | syn::VariantData::Unit => {}
syn::VariantData::Struct(_) |
syn::VariantData::Unit => {}
syn::VariantData::Tuple(ref fields) => {
if fields.len() != 1 {
cx.error("#[serde(tag = \"...\")] cannot be used with tuple variants");
cx.error("#[serde(tag = \"...\")] cannot be used with tuple \
variants");
break;
}
}
@@ -311,8 +314,7 @@ impl Variant {
}
MetaItem(ref meta_item) => {
cx.error(format!("unknown serde variant attribute `{}`",
meta_item.name()));
cx.error(format!("unknown serde variant attribute `{}`", meta_item.name()));
}
Literal(_) => {
@@ -372,9 +374,7 @@ pub enum FieldDefault {
impl Field {
/// Extract out the `#[serde(...)]` attributes from a struct field.
pub fn from_ast(cx: &Ctxt,
index: usize,
field: &syn::Field) -> Self {
pub fn from_ast(cx: &Ctxt, index: usize, field: &syn::Field) -> Self {
let mut ser_name = Attr::none(cx, "rename");
let mut de_name = Attr::none(cx, "rename");
let mut skip_serializing = BoolAttr::none(cx, "skip_serializing");
@@ -455,7 +455,8 @@ impl Field {
// Parse `#[serde(bound="D: Serialize")]`
MetaItem(NameValue(ref name, ref lit)) if name == "bound" => {
if let Ok(where_predicates) = parse_lit_into_where(cx, name.as_ref(), name.as_ref(), lit) {
if let Ok(where_predicates) =
parse_lit_into_where(cx, name.as_ref(), name.as_ref(), lit) {
ser_bound.set(where_predicates.clone());
de_bound.set(where_predicates);
}
@@ -470,8 +471,7 @@ impl Field {
}
MetaItem(ref meta_item) => {
cx.error(format!("unknown serde field attribute `{}`",
meta_item.name()));
cx.error(format!("unknown serde field attribute `{}`", meta_item.name()));
}
Literal(_) => {
@@ -542,13 +542,12 @@ impl Field {
type SerAndDe<T> = (Option<T>, Option<T>);
fn get_ser_and_de<T, F>(
cx: &Ctxt,
attr_name: &'static str,
items: &[syn::NestedMetaItem],
f: F
) -> Result<SerAndDe<T>, ()>
where F: Fn(&Ctxt, &str, &str, &syn::Lit) -> Result<T, ()>,
fn get_ser_and_de<T, F>(cx: &Ctxt,
attr_name: &'static str,
items: &[syn::NestedMetaItem],
f: F)
-> Result<SerAndDe<T>, ()>
where F: Fn(&Ctxt, &str, &str, &syn::Lit) -> Result<T, ()>
{
let mut ser_item = Attr::none(cx, attr_name);
let mut de_item = Attr::none(cx, attr_name);
@@ -568,7 +567,8 @@ fn get_ser_and_de<T, F>(
}
_ => {
cx.error(format!("malformed {0} attribute, expected `{0}(serialize = ..., deserialize = ...)`",
cx.error(format!("malformed {0} attribute, expected `{0}(serialize = ..., \
deserialize = ...)`",
attr_name));
return Err(());
}
@@ -578,35 +578,34 @@ fn get_ser_and_de<T, F>(
Ok((ser_item.get(), de_item.get()))
}
fn get_renames(
cx: &Ctxt,
items: &[syn::NestedMetaItem],
) -> Result<SerAndDe<String>, ()> {
fn get_renames(cx: &Ctxt, items: &[syn::NestedMetaItem]) -> Result<SerAndDe<String>, ()> {
get_ser_and_de(cx, "rename", items, get_string_from_lit)
}
fn get_where_predicates(
cx: &Ctxt,
items: &[syn::NestedMetaItem],
) -> Result<SerAndDe<Vec<syn::WherePredicate>>, ()> {
fn get_where_predicates(cx: &Ctxt,
items: &[syn::NestedMetaItem])
-> Result<SerAndDe<Vec<syn::WherePredicate>>, ()> {
get_ser_and_de(cx, "bound", items, parse_lit_into_where)
}
pub fn get_serde_meta_items(attr: &syn::Attribute) -> Option<Vec<syn::NestedMetaItem>> {
match attr.value {
List(ref name, ref items) if name == "serde" => {
Some(items.iter().cloned().collect())
}
_ => None
List(ref name, ref items) if name == "serde" => Some(items.iter().cloned().collect()),
_ => None,
}
}
fn get_string_from_lit(cx: &Ctxt, attr_name: &str, meta_item_name: &str, lit: &syn::Lit) -> Result<String, ()> {
fn get_string_from_lit(cx: &Ctxt,
attr_name: &str,
meta_item_name: &str,
lit: &syn::Lit)
-> Result<String, ()> {
if let syn::Lit::Str(ref s, _) = *lit {
Ok(s.clone())
} else {
cx.error(format!("expected serde {} attribute to be a string: `{} = \"...\"`",
attr_name, meta_item_name));
attr_name,
meta_item_name));
Err(())
}
}
@@ -616,7 +615,11 @@ fn parse_lit_into_path(cx: &Ctxt, attr_name: &str, lit: &syn::Lit) -> Result<syn
syn::parse_path(&string).map_err(|err| cx.error(err))
}
fn parse_lit_into_where(cx: &Ctxt, attr_name: &str, meta_item_name: &str, lit: &syn::Lit) -> Result<Vec<syn::WherePredicate>, ()> {
fn parse_lit_into_where(cx: &Ctxt,
attr_name: &str,
meta_item_name: &str,
lit: &syn::Lit)
-> Result<Vec<syn::WherePredicate>, ()> {
let string = try!(get_string_from_lit(cx, attr_name, meta_item_name, lit));
if string.is_empty() {
return Ok(Vec::new());