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Caps: serde as an enum

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`Caps` can be `any`, `empty` or matching a list of `Structures`.
This commit is contained in:
François Laignel 2018-07-29 16:04:39 +02:00 committed by Sebastian Dröge
parent 9f2f684188
commit 64ea419839
2 changed files with 170 additions and 18 deletions
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178
gstreamer/src/caps_serde.rs
View file

@ -7,7 +7,7 @@
// except according to those terms.
use serde::de;
use serde::de::{Deserialize, Deserializer, SeqAccess, Visitor};
use serde::de::{Deserialize, Deserializer, EnumAccess, SeqAccess, VariantAccess, Visitor};
use serde::ser::{Serialize, SerializeSeq, SerializeTuple, Serializer};
use std::fmt;
@ -17,6 +17,25 @@ use CapsRef;
use Structure;
use StructureRef;
enum CapsVariantKinds {
Any,
Empty,
Some,
}
const CAPS_VARIANT_ANY_ID: u32 = 0;
const CAPS_VARIANT_ANY_STR: &str = "Any";
const CAPS_VARIANT_EMPTY_ID: u32 = 1;
const CAPS_VARIANT_EMPTY_STR: &str = "Empty";
const CAPS_VARIANT_SOME_ID: u32 = 2;
const CAPS_VARIANT_SOME_STR: &str = "Some";
const CAPS_VARIANT_NAMES: &[&str] = &[
&CAPS_VARIANT_ANY_STR,
&CAPS_VARIANT_EMPTY_STR,
&CAPS_VARIANT_SOME_STR,
];
// `CapsFeature` is not available in `gstreamer-rs` yet
struct CapsItemSe<'a>(&'a StructureRef);
impl<'a> Serialize for CapsItemSe<'a> {
@ -30,9 +49,10 @@ impl<'a> Serialize for CapsItemSe<'a> {
}
}
impl Serialize for CapsRef {
struct CapsForIterSe<'a>(&'a CapsRef);
impl<'a> Serialize for CapsForIterSe<'a> {
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
let iter = self.iter();
let iter = self.0.iter();
let size = iter.size_hint().0;
if size > 0 {
let mut seq = serializer.serialize_seq(Some(size))?;
@ -47,6 +67,31 @@ impl Serialize for CapsRef {
}
}
impl Serialize for CapsRef {
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
if self.is_any() {
serializer.serialize_unit_variant(
stringify!(Caps),
CAPS_VARIANT_ANY_ID,
CAPS_VARIANT_ANY_STR,
)
} else if self.is_empty() {
serializer.serialize_unit_variant(
stringify!(Caps),
CAPS_VARIANT_EMPTY_ID,
CAPS_VARIANT_EMPTY_STR,
)
} else {
serializer.serialize_newtype_variant(
stringify!(Caps),
CAPS_VARIANT_SOME_ID,
CAPS_VARIANT_SOME_STR,
&CapsForIterSe(&self),
)
}
}
}
impl Serialize for Caps {
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
self.as_ref().serialize(serializer)
@ -96,9 +141,11 @@ impl<'de> Deserialize<'de> for CapsItemDe {
}
}
struct CapsVisitor;
impl<'de> Visitor<'de> for CapsVisitor {
type Value = Caps;
struct CapsSome(Caps);
struct CapsSomeVisitor;
impl<'de> Visitor<'de> for CapsSomeVisitor {
type Value = CapsSome;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("a sequence of `(Structure, Option<CapsFeature>)`")
@ -112,13 +159,76 @@ impl<'de> Visitor<'de> for CapsVisitor {
caps.append_structure(caps_item.into());
}
}
Ok(caps)
Ok(CapsSome(caps))
}
}
impl<'de> Deserialize<'de> for CapsSome {
fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<CapsSome, D::Error> {
deserializer.deserialize_seq(CapsSomeVisitor)
}
}
struct CapsVariantKindsVisitor;
impl<'de> Visitor<'de> for CapsVariantKindsVisitor {
type Value = CapsVariantKinds;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("a Caps variant kind (`Any`, `None` or `Some`)")
}
fn visit_u32<E: de::Error>(self, value: u32) -> Result<Self::Value, E> {
match value {
CAPS_VARIANT_ANY_ID => Ok(CapsVariantKinds::Any),
CAPS_VARIANT_EMPTY_ID => Ok(CapsVariantKinds::Empty),
CAPS_VARIANT_SOME_ID => Ok(CapsVariantKinds::Some),
_ => Err(de::Error::invalid_value(
de::Unexpected::Unsigned(value as u64),
&self,
)),
}
}
fn visit_str<E: de::Error>(self, value: &str) -> Result<Self::Value, E> {
match value {
CAPS_VARIANT_ANY_STR => Ok(CapsVariantKinds::Any),
CAPS_VARIANT_EMPTY_STR => Ok(CapsVariantKinds::Empty),
CAPS_VARIANT_SOME_STR => Ok(CapsVariantKinds::Some),
_ => Err(de::Error::unknown_variant(value, CAPS_VARIANT_NAMES)),
}
}
}
impl<'de> Deserialize<'de> for CapsVariantKinds {
fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
deserializer.deserialize_identifier(CapsVariantKindsVisitor)
}
}
struct CapsVisitor;
impl<'de> Visitor<'de> for CapsVisitor {
type Value = Caps;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("a Caps enum (`Any`, `None` or `Some()`)")
}
fn visit_enum<A: EnumAccess<'de>>(self, data: A) -> Result<Self::Value, A::Error> {
let res = match data.variant()? {
(CapsVariantKinds::Any, _v) => Caps::new_any(),
(CapsVariantKinds::Empty, _v) => Caps::new_empty(),
(CapsVariantKinds::Some, v) => v
.newtype_variant::<CapsSome>()
.map(|caps_some| caps_some.0)?,
};
Ok(res)
}
}
impl<'de> Deserialize<'de> for Caps {
fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
deserializer.deserialize_seq(CapsVisitor)
deserializer.deserialize_enum(stringify!(Caps), CAPS_VARIANT_NAMES, CapsVisitor)
}
}
@ -145,10 +255,10 @@ mod tests {
let mut pretty_config = ron::ser::PrettyConfig::default();
pretty_config.new_line = "".to_string();
let res = ron::ser::to_string_pretty(&caps, pretty_config);
let res = ron::ser::to_string_pretty(&caps, pretty_config.clone());
assert_eq!(
Ok(concat!(
"[",
"Some([",
" ((\"foo/bar\", [",
" (\"int\", \"i32\", 12),",
" (\"bool\", \"bool\", true),",
@ -159,10 +269,18 @@ mod tests {
" (\"i32\", 2),",
" ]),",
" ]), None),",
"]"
"])"
).to_owned()),
res,
);
let caps_any = Caps::new_any();
let res = ron::ser::to_string_pretty(&caps_any, pretty_config.clone());
assert_eq!(Ok("Any".to_owned()), res);
let caps_empty = Caps::new_empty();
let res = ron::ser::to_string_pretty(&caps_empty, pretty_config.clone());
assert_eq!(Ok("Empty".to_owned()), res);
}
#[test]
@ -171,8 +289,16 @@ mod tests {
::init().unwrap();
let caps_ron = "Any";
let caps: Caps = ron::de::from_str(caps_ron).unwrap();
assert!(caps.is_any());
let caps_ron = "Empty";
let caps: Caps = ron::de::from_str(caps_ron).unwrap();
assert!(caps.is_empty());
let caps_ron = r#"
[
Some([
(
("foo/bar", [
("int", "i32", 12),
@ -186,7 +312,7 @@ mod tests {
]),
None,
),
]"#;
])"#;
let caps: Caps = ron::de::from_str(caps_ron).unwrap();
let s = caps.get_structure(0).unwrap();
assert_eq!(
@ -203,4 +329,30 @@ mod tests {
).as_ref()
);
}
#[test]
fn test_serde_roundtrip() {
::init().unwrap();
let caps = Caps::new_any();
let caps_ser = ron::ser::to_string(&caps).unwrap();
let caps_de: Caps = ron::de::from_str(caps_ser.as_str()).unwrap();
assert!(caps_de.is_any());
let caps = Caps::new_empty();
let caps_ser = ron::ser::to_string(&caps).unwrap();
let caps_de: Caps = ron::de::from_str(caps_ser.as_str()).unwrap();
assert!(caps_de.is_empty());
let caps = Caps::builder("foo/bar")
.field("int", &12)
.field("bool", &true)
.field("string", &"bla")
.field("fraction", &Fraction::new(1, 2))
.field("array", &Array::new(&[&1, &2]))
.build();
let caps_ser = ron::ser::to_string(&caps).unwrap();
let caps_de: Caps = ron::de::from_str(caps_ser.as_str()).unwrap();
assert!(caps_de.is_strictly_equal(&caps));
}
}

10
gstreamer/src/sample_serde.rs
View file

@ -67,7 +67,7 @@ impl From<SampleDe> for Sample {
impl<'de> Deserialize<'de> for Sample {
fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
SampleDe::deserialize(deserializer).and_then(|sample_de| Ok(sample_de.into()))
SampleDe::deserialize(deserializer).map(|sample_de| sample_de.into())
}
}
@ -149,12 +149,12 @@ mod tests {
" buffer: \"AQIDBA==\",",
" )),",
" buffer_list: None,",
" caps: Some([",
" caps: Some(Some([",
" ((\"sample/caps\", [",
" (\"int\", \"i32\", 12),",
" (\"bool\", \"bool\", true),",
" ]), None),",
" ]),",
" ])),",
" segment: Some((",
" flags: (",
" bits: 9,",
@ -249,12 +249,12 @@ mod tests {
buffer: "AQIDBA==",
)),
buffer_list: None,
caps: Some([
caps: Some(Some([
(("sample/caps", [
("int", "i32", 12),
("bool", "bool", true),
]), None),
]),
])),
segment: Some((
flags: (
bits: 0,