155 lines
4.0 KiB
Rust
155 lines
4.0 KiB
Rust
pub use lazy_static::lazy_static;
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pub use preserves;
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pub use preserves::value::DomainDecode;
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pub use preserves::value::Reader;
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pub use preserves::value::boundary as B;
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pub mod interpret;
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use preserves::value::ConfiguredReader;
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use preserves::value::Domain;
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use preserves::value::DomainEncode;
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use preserves::value::NestedValue;
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use preserves::value::NoEmbeddedDomainCodec;
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use preserves::value::Writer;
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use std::convert::From;
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use std::convert::Into;
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use std::io;
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use std::marker::PhantomData;
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use thiserror::Error;
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pub trait NestedValueCodec {} // marker trait
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impl NestedValueCodec for () {}
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pub trait Parse<L, Value: NestedValue>: Sized {
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fn parse(language: L, value: &Value) -> Result<Self, ParseError>;
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}
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impl<'a, T: NestedValueCodec, Value: NestedValue> Parse<&'a T, Value> for Value {
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fn parse(_language: &'a T, value: &Value) -> Result<Self, ParseError> {
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Ok(value.clone())
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}
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}
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pub trait Unparse<L, Value: NestedValue> {
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fn unparse(&self, language: L) -> Value;
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}
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impl<'a, T: NestedValueCodec, Value: NestedValue> Unparse<&'a T, Value> for Value {
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fn unparse(&self, _language: &'a T) -> Value {
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self.clone()
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}
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}
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pub trait Codec<N: NestedValue> {
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fn parse<'a, T: Parse<&'a Self, N>>(&'a self, value: &N) -> Result<T, ParseError>;
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fn unparse<'a, T: Unparse<&'a Self, N>>(&'a self, value: &T) -> N;
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}
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impl<L, N: NestedValue> Codec<N> for L {
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fn parse<'a, T: Parse<&'a L, N>>(&'a self, value: &N) -> Result<T, ParseError> {
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T::parse(self, value)
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}
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fn unparse<'a, T: Unparse<&'a L, N>>(&'a self, value: &T) -> N {
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value.unparse(self)
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}
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}
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pub trait Deserialize<N: NestedValue>
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where
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Self: Sized
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{
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fn deserialize<'de, Dec: DomainDecode<N::Embedded>, R: Reader<'de>>(
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r: &mut ConfiguredReader<'de, N, R, Dec>,
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) -> Result<Self, ParseError>;
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}
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pub trait Serialize
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{
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fn serialize<W: Writer>(&self, w: &mut W) -> io::Result<()>;
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}
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pub struct SchemaDomainCodec<N: NestedValue>(PhantomData<N>);
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impl<N: NestedValue> Default for SchemaDomainCodec<N> {
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fn default() -> Self {
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SchemaDomainCodec(PhantomData)
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}
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}
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impl<N, T: Deserialize<N> + Domain> DomainDecode<T> for SchemaDomainCodec<N>
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where
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for<'value> N: NestedValue<Embedded = T> + 'value
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{
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fn decode_embedded<'de, R: Reader<'de>>(
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&mut self,
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r: &mut R,
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read_annotations: bool,
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) -> io::Result<T> {
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Ok(T::deserialize(&mut r.configured::<N, T::Decode>(read_annotations, T::Decode::default()))?)
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}
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}
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impl<N: NestedValue<Embedded = T>, T: /* Serialize + */ Domain> DomainEncode<T> for SchemaDomainCodec<N> {
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fn encode_embedded<W: Writer>(
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&mut self,
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w: &mut W,
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d: &T,
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) -> io::Result<()> {
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todo!()
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// d.serialize(w)
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}
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}
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pub fn decode_lit<N: NestedValue>(bs: &[u8]) -> io::Result<N> {
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preserves::value::packed::from_bytes(bs, &mut NoEmbeddedDomainCodec)
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}
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#[derive(Error, Debug)]
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pub enum ParseError {
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#[error("Input not conformant with Schema: {0}")]
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ConformanceError(&'static str),
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#[error(transparent)]
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Preserves(preserves::error::Error),
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}
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impl From<preserves::error::Error> for ParseError {
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fn from(v: preserves::error::Error) -> Self {
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match v {
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preserves::error::Error::Expected(_) =>
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ParseError::ConformanceError("preserves::error::Error::Expected"),
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_ =>
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ParseError::Preserves(v),
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}
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}
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}
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impl From<io::Error> for ParseError {
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fn from(v: io::Error) -> Self {
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preserves::error::Error::from(v).into()
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}
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}
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impl From<ParseError> for io::Error {
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fn from(v: ParseError) -> Self {
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match v {
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ParseError::ConformanceError(_) => io::Error::new(io::ErrorKind::InvalidData, v),
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ParseError::Preserves(e) => e.into(),
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}
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}
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}
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impl ParseError {
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pub fn conformance_error(context: &'static str) -> Self {
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ParseError::ConformanceError(context)
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}
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pub fn is_conformance_error(&self) -> bool {
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return if let ParseError::ConformanceError(_) = self { true } else { false }
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}
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}
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