166 lines
4.6 KiB
Rust
166 lines
4.6 KiB
Rust
//! Serde and plain-Preserves codec errors.
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use num::bigint::BigInt;
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use std::convert::From;
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use std::io;
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/// Representation of parse, deserialization, and other conversion errors.
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#[derive(Debug)]
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pub enum Error {
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/// Generic IO error.
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Io(io::Error),
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/// Generic message for the user.
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Message(String),
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/// Invalid unicode scalar `n` found during interpretation of a `<UnicodeScalar n>` record
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/// as a Rust `char`.
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InvalidUnicodeScalar(u32),
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/// Preserves supports arbitrary integers; when these are converted to specific Rust
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/// machine word types, sometimes they exceed the available range.
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NumberOutOfRange(BigInt),
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/// Serde has limited support for deserializing free-form data; this error is signalled
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/// when one of the limits is hit.
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CannotDeserializeAny,
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/// Syntax error: missing closing delimiter (`)`, `]`, `}`, `>` in text syntax; `0x84` in binary syntax; etc.)
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MissingCloseDelimiter,
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/// Signalled when an expected term is not present.
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MissingItem,
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/// Signalled when what was received did not match expectations.
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Expected(ExpectedKind, Received),
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#[doc(hidden)] // TODO remove this enum variant? It isn't used
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StreamingSerializationUnsupported,
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}
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/// Used in [Error::Expected] to indicate what was received.
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#[derive(Debug)]
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pub enum Received {
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#[doc(hidden)] // TODO remove this enum variant? It isn't used
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ReceivedSomethingElse,
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/// Received a record with the given label symbol text.
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ReceivedRecordWithLabel(String),
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/// Received some other value, described in the `String`
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ReceivedOtherValue(String),
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}
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/// Used in [Error::Expected] to indicate what was expected.
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#[derive(Debug, PartialEq)]
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pub enum ExpectedKind {
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Boolean,
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Float,
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Double,
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SignedIntegerI128,
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SignedIntegerU128,
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SignedInteger,
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String,
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ByteString,
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Symbol,
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/// Expected a record, either of a specific arity (length) or of no specific arity
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Record(Option<usize>),
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/// Expected a record with a symbol label with text `String`, perhaps of some specific arity
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SimpleRecord(String, Option<usize>),
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Sequence,
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Set,
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Dictionary,
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Embedded,
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SequenceOrSet, // Because of hacking up serde's data model: see open_sequence_or_set etc.
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Option,
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UnicodeScalar,
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}
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impl From<io::Error> for Error {
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fn from(e: io::Error) -> Self {
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Error::Io(e)
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}
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}
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impl From<Error> for io::Error {
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fn from(e: Error) -> Self {
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match e {
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Error::Io(ioe) => ioe,
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Error::Message(str) => io::Error::new(io::ErrorKind::Other, str),
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_ => io::Error::new(io::ErrorKind::Other, e.to_string()),
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}
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}
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}
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impl serde::ser::Error for Error {
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fn custom<T: std::fmt::Display>(msg: T) -> Self {
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Self::Message(msg.to_string())
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}
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}
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impl serde::de::Error for Error {
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fn custom<T: std::fmt::Display>(msg: T) -> Self {
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Self::Message(msg.to_string())
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}
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}
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impl std::error::Error for Error {}
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impl std::fmt::Display for Error {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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write!(f, "{:?}", self)
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}
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}
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//---------------------------------------------------------------------------
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/// True iff `e` is `Error::Io`
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pub fn is_io_error(e: &Error) -> bool {
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matches!(e, Error::Io(_))
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}
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/// Produce the generic "end of file" error, `Error::Io(`[io_eof]`())`
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pub fn eof() -> Error {
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Error::Io(io_eof())
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}
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/// True iff `e` is an "end of file" error; see [is_eof_io_error]
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pub fn is_eof_error(e: &Error) -> bool {
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if let Error::Io(ioe) = e {
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is_eof_io_error(ioe)
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} else {
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false
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}
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}
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/// Produce a syntax error bearing the message `s`
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pub fn syntax_error(s: &str) -> Error {
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Error::Io(io_syntax_error(s))
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}
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/// True iff `e` is a syntax error; see [is_syntax_io_error]
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pub fn is_syntax_error(e: &Error) -> bool {
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if let Error::Io(ioe) = e {
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is_syntax_io_error(ioe)
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} else {
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false
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}
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}
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//---------------------------------------------------------------------------
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/// Produce an [io::Error] of [io::ErrorKind::UnexpectedEof].
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pub fn io_eof() -> io::Error {
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io::Error::new(io::ErrorKind::UnexpectedEof, "EOF")
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}
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/// True iff `e` is [io::ErrorKind::UnexpectedEof]
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pub fn is_eof_io_error(e: &io::Error) -> bool {
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matches!(e.kind(), io::ErrorKind::UnexpectedEof)
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}
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/// Produce a syntax error ([io::ErrorKind::InvalidData]) bearing the message `s`
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pub fn io_syntax_error(s: &str) -> io::Error {
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io::Error::new(io::ErrorKind::InvalidData, s)
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}
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/// True iff `e` is an [io::ErrorKind::InvalidData] (a syntax error)
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pub fn is_syntax_io_error(e: &io::Error) -> bool {
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matches!(e.kind(), io::ErrorKind::InvalidData)
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}
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