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Rewrite enum deserialization to not require allocations

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This commit is contained in:
Erick Tryzelaar
2015-03-15 22:04:17 -07:00
parent b40d8f7bac
commit 78137ee3a4
7 changed files with 273 additions and 147 deletions
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src/json/de.rs
+40 -30
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@@ -409,8 +409,8 @@ impl<Iter> de::Deserializer for Deserializer<Iter>
}
#[inline]
fn visit_enum<V>(&mut self, mut visitor: V) -> Result<V::Value, Error>
where V: de::Visitor,
fn visit_enum<V>(&mut self, _name: &str, mut visitor: V) -> Result<V::Value, Error>
where V: de::EnumVisitor,
{
self.parse_whitespace();
@@ -418,14 +418,9 @@ impl<Iter> de::Deserializer for Deserializer<Iter>
self.bump();
self.parse_whitespace();
try!(self.parse_string());
try!(self.parse_object_colon());
let variant = str::from_utf8(&self.buf).unwrap().to_string();
let value = try!(visitor.visit_variant(&variant, EnumVisitor {
de: self,
}));
let value = {
try!(visitor.visit(&mut *self))
};
self.parse_whitespace();
@@ -433,7 +428,7 @@ impl<Iter> de::Deserializer for Deserializer<Iter>
self.bump();
Ok(value)
} else {
return Err(self.error(ErrorCode::ExpectedSomeValue));
Err(self.error(ErrorCode::ExpectedSomeValue))
}
} else {
Err(self.error(ErrorCode::ExpectedSomeValue))
@@ -541,7 +536,6 @@ impl<'a, Iter> de::MapVisitor for MapVisitor<'a, Iter>
}
if self.de.eof() {
println!("here3");
return Err(self.de.error(ErrorCode::EOFWhileParsingValue));
}
@@ -599,42 +593,58 @@ impl<'a, Iter> de::MapVisitor for MapVisitor<'a, Iter>
}
}
struct EnumVisitor<'a, Iter: 'a> {
de: &'a mut Deserializer<Iter>,
}
impl<'a, Iter> de::EnumVisitor for EnumVisitor<'a, Iter>
impl<Iter> de::VariantVisitor for Deserializer<Iter>
where Iter: Iterator<Item=u8>,
{
type Error = Error;
fn visit_variant<V>(&mut self) -> Result<V, Error>
where V: de::Deserialize
{
de::Deserialize::deserialize(self)
}
/*
fn visit_value<V>(&mut self) -> Result<V, Error>
where V: de::Deserialize
{
de::Deserialize::deserialize(self)
}
*/
fn visit_unit(&mut self) -> Result<(), Error> {
de::Deserialize::deserialize(self.de)
try!(self.parse_object_colon());
de::Deserialize::deserialize(self)
}
fn visit_seq<V>(&mut self, mut visitor: V) -> Result<V::Value, Error>
where V: de::EnumSeqVisitor,
where V: de::EnumSeqVisitor
{
self.de.parse_whitespace();
try!(self.parse_object_colon());
if self.de.ch_is(b'[') {
self.de.bump();
visitor.visit(SeqVisitor::new(self.de))
self.parse_whitespace();
if self.ch_is(b'[') {
self.bump();
visitor.visit(SeqVisitor::new(self))
} else {
Err(self.de.error(ErrorCode::ExpectedSomeValue))
Err(self.error(ErrorCode::ExpectedSomeValue))
}
}
fn visit_map<V>(&mut self, mut visitor: V) -> Result<V::Value, Error>
where V: de::EnumMapVisitor,
where V: de::EnumMapVisitor
{
self.de.parse_whitespace();
try!(self.parse_object_colon());
if self.de.ch_is(b'{') {
self.de.bump();
visitor.visit(MapVisitor::new(self.de))
self.parse_whitespace();
if self.ch_is(b'{') {
self.bump();
visitor.visit(MapVisitor::new(self))
} else {
Err(self.de.error(ErrorCode::ExpectedSomeValue))
Err(self.error(ErrorCode::ExpectedSomeValue))
}
}
}