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Shorten the syn meta item matches

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This commit is contained in:
David Tolnay
2016-11-02 22:56:27 -07:00
parent 6d40d9e8ec
commit f8c3d225a3
1 changed files with 29 additions and 27 deletions
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serde_codegen_internals/src/attr.rs
+29 -27
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@@ -1,5 +1,7 @@
use Ctxt;
use syn;
use syn::MetaItem::{List, NameValue, Word};
use syn::NestedMetaItem::{Literal, MetaItem};
// This module handles parsing of `#[serde(...)]` attributes. The entrypoints
// are `attr::Item::from_ast`, `attr::Variant::from_ast`, and
@@ -105,7 +107,7 @@ impl Item {
for meta_item in meta_items {
match meta_item {
// Parse `#[serde(rename="foo")]`
syn::NestedMetaItem::MetaItem(syn::MetaItem::NameValue(ref name, ref lit)) if name == "rename" => {
MetaItem(NameValue(ref name, ref lit)) if name == "rename" => {
if let Ok(s) = get_string_from_lit(cx, name.as_ref(), name.as_ref(), lit) {
ser_name.set(s.clone());
de_name.set(s);
@@ -113,7 +115,7 @@ impl Item {
}
// Parse `#[serde(rename(serialize="foo", deserialize="bar"))]`
syn::NestedMetaItem::MetaItem(syn::MetaItem::List(ref name, ref meta_items)) if name == "rename" => {
MetaItem(List(ref name, ref meta_items)) if name == "rename" => {
if let Ok((ser, de)) = get_renames(cx, meta_items) {
ser_name.set_opt(ser);
de_name.set_opt(de);
@@ -121,12 +123,12 @@ impl Item {
}
// Parse `#[serde(deny_unknown_fields)]`
syn::NestedMetaItem::MetaItem(syn::MetaItem::Word(ref name)) if name == "deny_unknown_fields" => {
MetaItem(Word(ref name)) if name == "deny_unknown_fields" => {
deny_unknown_fields.set_true();
}
// Parse `#[serde(bound="D: Serialize")]`
syn::NestedMetaItem::MetaItem(syn::MetaItem::NameValue(ref name, ref lit)) if name == "bound" => {
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) {
ser_bound.set(where_predicates.clone());
de_bound.set(where_predicates);
@@ -134,19 +136,19 @@ impl Item {
}
// Parse `#[serde(bound(serialize="D: Serialize", deserialize="D: Deserialize"))]`
syn::NestedMetaItem::MetaItem(syn::MetaItem::List(ref name, ref meta_items)) if name == "bound" => {
MetaItem(List(ref name, ref meta_items)) if name == "bound" => {
if let Ok((ser, de)) = get_where_predicates(cx, meta_items) {
ser_bound.set_opt(ser);
de_bound.set_opt(de);
}
}
syn::NestedMetaItem::MetaItem(ref meta_item) => {
MetaItem(ref meta_item) => {
cx.error(format!("unknown serde container attribute `{}`",
meta_item.name()));
}
syn::NestedMetaItem::Literal(_) => {
Literal(_) => {
cx.error(format!("unexpected literal in serde container attribute"));
}
}
@@ -196,7 +198,7 @@ impl Variant {
for meta_item in meta_items {
match meta_item {
// Parse `#[serde(rename="foo")]`
syn::NestedMetaItem::MetaItem(syn::MetaItem::NameValue(ref name, ref lit)) if name == "rename" => {
MetaItem(NameValue(ref name, ref lit)) if name == "rename" => {
if let Ok(s) = get_string_from_lit(cx, name.as_ref(), name.as_ref(), lit) {
ser_name.set(s.clone());
de_name.set(s);
@@ -204,19 +206,19 @@ impl Variant {
}
// Parse `#[serde(rename(serialize="foo", deserialize="bar"))]`
syn::NestedMetaItem::MetaItem(syn::MetaItem::List(ref name, ref meta_items)) if name == "rename" => {
MetaItem(List(ref name, ref meta_items)) if name == "rename" => {
if let Ok((ser, de)) = get_renames(cx, meta_items) {
ser_name.set_opt(ser);
de_name.set_opt(de);
}
}
syn::NestedMetaItem::MetaItem(ref meta_item) => {
MetaItem(ref meta_item) => {
cx.error(format!("unknown serde variant attribute `{}`",
meta_item.name()));
}
syn::NestedMetaItem::Literal(_) => {
Literal(_) => {
cx.error(format!("unexpected literal in serde variant attribute"));
}
}
@@ -286,7 +288,7 @@ impl Field {
for meta_item in meta_items {
match meta_item {
// Parse `#[serde(rename="foo")]`
syn::NestedMetaItem::MetaItem(syn::MetaItem::NameValue(ref name, ref lit)) if name == "rename" => {
MetaItem(NameValue(ref name, ref lit)) if name == "rename" => {
if let Ok(s) = get_string_from_lit(cx, name.as_ref(), name.as_ref(), lit) {
ser_name.set(s.clone());
de_name.set(s);
@@ -294,7 +296,7 @@ impl Field {
}
// Parse `#[serde(rename(serialize="foo", deserialize="bar"))]`
syn::NestedMetaItem::MetaItem(syn::MetaItem::List(ref name, ref meta_items)) if name == "rename" => {
MetaItem(List(ref name, ref meta_items)) if name == "rename" => {
if let Ok((ser, de)) = get_renames(cx, meta_items) {
ser_name.set_opt(ser);
de_name.set_opt(de);
@@ -302,50 +304,50 @@ impl Field {
}
// Parse `#[serde(default)]`
syn::NestedMetaItem::MetaItem(syn::MetaItem::Word(ref name)) if name == "default" => {
MetaItem(Word(ref name)) if name == "default" => {
default.set(FieldDefault::Default);
}
// Parse `#[serde(default="...")]`
syn::NestedMetaItem::MetaItem(syn::MetaItem::NameValue(ref name, ref lit)) if name == "default" => {
MetaItem(NameValue(ref name, ref lit)) if name == "default" => {
if let Ok(path) = parse_lit_into_path(cx, name.as_ref(), lit) {
default.set(FieldDefault::Path(path));
}
}
// Parse `#[serde(skip_serializing)]`
syn::NestedMetaItem::MetaItem(syn::MetaItem::Word(ref name)) if name == "skip_serializing" => {
MetaItem(Word(ref name)) if name == "skip_serializing" => {
skip_serializing.set_true();
}
// Parse `#[serde(skip_deserializing)]`
syn::NestedMetaItem::MetaItem(syn::MetaItem::Word(ref name)) if name == "skip_deserializing" => {
MetaItem(Word(ref name)) if name == "skip_deserializing" => {
skip_deserializing.set_true();
}
// Parse `#[serde(skip_serializing_if="...")]`
syn::NestedMetaItem::MetaItem(syn::MetaItem::NameValue(ref name, ref lit)) if name == "skip_serializing_if" => {
MetaItem(NameValue(ref name, ref lit)) if name == "skip_serializing_if" => {
if let Ok(path) = parse_lit_into_path(cx, name.as_ref(), lit) {
skip_serializing_if.set(path);
}
}
// Parse `#[serde(serialize_with="...")]`
syn::NestedMetaItem::MetaItem(syn::MetaItem::NameValue(ref name, ref lit)) if name == "serialize_with" => {
MetaItem(NameValue(ref name, ref lit)) if name == "serialize_with" => {
if let Ok(path) = parse_lit_into_path(cx, name.as_ref(), lit) {
serialize_with.set(path);
}
}
// Parse `#[serde(deserialize_with="...")]`
syn::NestedMetaItem::MetaItem(syn::MetaItem::NameValue(ref name, ref lit)) if name == "deserialize_with" => {
MetaItem(NameValue(ref name, ref lit)) if name == "deserialize_with" => {
if let Ok(path) = parse_lit_into_path(cx, name.as_ref(), lit) {
deserialize_with.set(path);
}
}
// Parse `#[serde(bound="D: Serialize")]`
syn::NestedMetaItem::MetaItem(syn::MetaItem::NameValue(ref name, ref lit)) if name == "bound" => {
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) {
ser_bound.set(where_predicates.clone());
de_bound.set(where_predicates);
@@ -353,19 +355,19 @@ impl Field {
}
// Parse `#[serde(bound(serialize="D: Serialize", deserialize="D: Deserialize"))]`
syn::NestedMetaItem::MetaItem(syn::MetaItem::List(ref name, ref meta_items)) if name == "bound" => {
MetaItem(List(ref name, ref meta_items)) if name == "bound" => {
if let Ok((ser, de)) = get_where_predicates(cx, meta_items) {
ser_bound.set_opt(ser);
de_bound.set_opt(de);
}
}
syn::NestedMetaItem::MetaItem(ref meta_item) => {
MetaItem(ref meta_item) => {
cx.error(format!("unknown serde field attribute `{}`",
meta_item.name()));
}
syn::NestedMetaItem::Literal(_) => {
Literal(_) => {
cx.error(format!("unexpected literal in serde field attribute"));
}
}
@@ -446,13 +448,13 @@ fn get_ser_and_de<T, F>(
for item in items {
match *item {
syn::NestedMetaItem::MetaItem(syn::MetaItem::NameValue(ref name, ref lit)) if name == "serialize" => {
MetaItem(NameValue(ref name, ref lit)) if name == "serialize" => {
if let Ok(v) = f(cx, attr_name, name.as_ref(), lit) {
ser_item.set(v);
}
}
syn::NestedMetaItem::MetaItem(syn::MetaItem::NameValue(ref name, ref lit)) if name == "deserialize" => {
MetaItem(NameValue(ref name, ref lit)) if name == "deserialize" => {
if let Ok(v) = f(cx, attr_name, name.as_ref(), lit) {
de_item.set(v);
}
@@ -485,7 +487,7 @@ fn get_where_predicates(
pub fn get_serde_meta_items(attr: &syn::Attribute) -> Option<Vec<syn::NestedMetaItem>> {
match attr.value {
syn::MetaItem::List(ref name, ref items) if name == "serde" => {
List(ref name, ref items) if name == "serde" => {
Some(items.iter().cloned().collect())
}
_ => None