forked from syndicate-lang/preserves
109 lines
2.6 KiB
Rust
109 lines
2.6 KiB
Rust
pub use lazy_static::lazy_static;
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pub use preserves;
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pub use preserves::value::Reader;
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pub use preserves::value::boundary as B;
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use preserves::value::ArcValue;
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use preserves::value::Domain;
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use preserves::value::IOValue;
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use preserves::value::NestedValue;
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use preserves::value::NoEmbeddedDomainCodec;
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use preserves::value::Value;
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use std::convert::From;
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use std::convert::TryFrom;
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use std::io;
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use std::marker::PhantomData;
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use std::sync::Arc;
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use thiserror::Error;
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pub struct Codec<N: NestedValue, L: Default> {
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pub literals: L,
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phantom: PhantomData<N>,
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}
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impl<N: NestedValue, L: Default> Codec<N, L> {
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pub fn new() -> Self {
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Codec {
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literals: L::default(),
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phantom: PhantomData,
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}
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}
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}
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pub trait Deserialize<'de, N: NestedValue, R: Reader<'de, N>>
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where
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Self: Sized
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{
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fn deserialize(r: &mut R) -> Result<Self, ParseError>;
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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, NoEmbeddedDomainCodec)
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}
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pub fn decode_embedded<D: Domain>(
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v: &IOValue,
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) -> Result<ArcValue<Arc<D>>, ParseError>
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where
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for<'a> D: TryFrom<&'a IOValue, Error = ParseError>
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{
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v.copy_via(&mut |d| Ok(Value::Embedded(Arc::new(D::try_from(d)?))))
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}
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pub fn encode_embedded<D: Domain>(
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v: &ArcValue<Arc<D>>,
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) -> IOValue
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where
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for<'a> IOValue: From<&'a D>
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{
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v.copy_via::<_, _, std::convert::Infallible>(
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&mut |d| Ok(Value::Embedded(IOValue::from(d)))).unwrap()
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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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