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feat(codegen): Add more attributes to skip serializing

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These attributes are `#[serde(skip_serializing_if_none)]` and
`#[serde(skip_serializing_if_empty)]`.
This commit is contained in:
Erick Tryzelaar
2015-09-07 16:44:56 -07:00
parent c68ab508c0
commit c4392ff256
3 changed files with 247 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files
serde_codegen/src/ser.rs
+38 -13
View File
@@ -580,23 +580,31 @@ fn serialize_struct_visitor<I>(
) -> (P<ast::Item>, P<ast::Item>)
where I: Iterator<Item=P<ast::Expr>>,
{
let value_exprs = value_exprs.collect::<Vec<_>>();
let field_attrs = struct_field_attrs(cx, builder, struct_def);
let len = struct_def.fields.len() - field_attrs.iter()
.fold(0, |sum, field| {
sum + if field.skip_serializing_field() { 1 } else { 0 }
});
let arms: Vec<ast::Arm> = field_attrs.into_iter()
.zip(value_exprs)
let arms: Vec<ast::Arm> = field_attrs.iter()
.zip(value_exprs.iter())
.filter(|&(ref field, _)| !field.skip_serializing_field())
.enumerate()
.map(|(i, (field, value_expr))| {
.map(|(i, (ref field, value_expr))| {
let key_expr = field.serializer_key_expr(cx);
let stmt = if field.skip_serializing_field_if_empty() {
quote_stmt!(cx, if $value_expr.is_empty() { continue; })
} else if field.skip_serializing_field_if_none() {
quote_stmt!(cx, if $value_expr.is_none() { continue; })
} else {
quote_stmt!(cx, {})
};
quote_arm!(cx,
$i => {
self.state += 1;
Ok(
$stmt
return Ok(
Some(
try!(
serializer.visit_struct_elt(
@@ -605,7 +613,7 @@ fn serialize_struct_visitor<I>(
)
)
)
)
);
}
)
})
@@ -622,6 +630,21 @@ fn serialize_struct_visitor<I>(
.strip_bounds()
.build();
let len = field_attrs.iter()
.zip(value_exprs.iter())
.map(|(field, value_expr)| {
if field.skip_serializing_field() {
quote_expr!(cx, 0)
} else if field.skip_serializing_field_if_empty() {
quote_expr!(cx, if $value_expr.is_empty() { 0 } else { 1 })
} else if field.skip_serializing_field_if_none() {
quote_expr!(cx, if $value_expr.is_none() { 0 } else { 1 })
} else {
quote_expr!(cx, 1)
}
})
.fold(quote_expr!(cx, 0), |sum, expr| quote_expr!(cx, $sum + $expr));
(
quote_item!(cx,
struct Visitor $visitor_impl_generics $where_clause {
@@ -640,9 +663,11 @@ fn serialize_struct_visitor<I>(
fn visit<S>(&mut self, serializer: &mut S) -> ::std::result::Result<Option<()>, S::Error>
where S: ::serde::ser::Serializer,
{
match self.state {
$arms
_ => Ok(None)
loop {
match self.state {
$arms
_ => { return Ok(None); }
}
}
}