Convert all Error + ErrorKind into one error

Cargo.lock

@@ -1136,6 +1136,7 @@ dependencies = [
  "oxiri",
  "oxsdatatypes",
  "rand",
+ "thiserror",
 ]
 
 [[package]]
@@ -1176,6 +1177,7 @@ name = "oxsdatatypes"
 version = "0.2.0-alpha.1"
 dependencies = [
  "js-sys",
+ "thiserror",
 ]
 
 [[package]]
@@ -1761,6 +1763,7 @@ dependencies = [
  "oxrdf",
  "peg",
  "rand",
+ "thiserror",
 ]
 
 [[package]]

lib/oxigraph/src/storage/error.rs

@@ -1,7 +1,7 @@
 use crate::io::{ParseError, RdfFormat};
 use oxiri::IriParseError;
 use std::error::Error;
-use std::{fmt, io};
+use std::io;
 use thiserror::Error;
 
 /// An error related to storage operations (reads, writes...).
@@ -15,8 +15,8 @@ pub enum StorageError {
     #[error(transparent)]
     Corruption(#[from] CorruptionError),
     #[doc(hidden)]
-    #[error(transparent)]
-    Other(Box<dyn Error + Send + Sync + 'static>),
+    #[error("{0}")]
+    Other(#[source] Box<dyn Error + Send + Sync + 'static>),
 }
 
 impl From<StorageError> for io::Error {
@@ -31,52 +31,25 @@ impl From<StorageError> for io::Error {
 }
 
 /// An error return if some content in the database is corrupted.
-#[derive(Debug)]
-pub struct CorruptionError {
-    inner: CorruptionErrorKind,
-}
-
-#[derive(Debug)]
-enum CorruptionErrorKind {
+#[derive(Debug, Error)]
+pub enum CorruptionError {
+    #[error("{0}")]
     Msg(String),
-    Other(Box<dyn Error + Send + Sync + 'static>),
+    #[error("{0}")]
+    Other(#[source] Box<dyn Error + Send + Sync + 'static>),
 }
 
 impl CorruptionError {
     /// Builds an error from a printable error message.
     #[inline]
     pub(crate) fn new(error: impl Into<Box<dyn Error + Send + Sync + 'static>>) -> Self {
-        Self {
-            inner: CorruptionErrorKind::Other(error.into()),
-        }
+        Self::Other(error.into())
     }
 
     /// Builds an error from a printable error message.
     #[inline]
     pub(crate) fn msg(msg: impl Into<String>) -> Self {
-        Self {
-            inner: CorruptionErrorKind::Msg(msg.into()),
-        }
-    }
-}
-
-impl fmt::Display for CorruptionError {
-    #[inline]
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match &self.inner {
-            CorruptionErrorKind::Msg(e) => e.fmt(f),
-            CorruptionErrorKind::Other(e) => e.fmt(f),
-        }
-    }
-}
-
-impl Error for CorruptionError {
-    #[inline]
-    fn source(&self) -> Option<&(dyn Error + 'static)> {
-        match &self.inner {
-            CorruptionErrorKind::Msg(_) => None,
-            CorruptionErrorKind::Other(e) => Some(e.as_ref()),
-        }
+        Self::Msg(msg.into())
     }
 }
 

lib/oxrdf/Cargo.toml

@@ -22,6 +22,7 @@ oxilangtag.workspace = true
 oxiri.workspace = true
 oxsdatatypes = { workspace = true, optional = true }
 rand.workspace = true
+thiserror.workspace = true
 
 [lints]
 workspace = true

lib/oxrdf/src/parser.rs

@@ -5,9 +5,9 @@ use crate::{
 };
 #[cfg(feature = "rdf-star")]
 use crate::{Subject, Triple};
-use std::error::Error;
+use std::char;
 use std::str::{Chars, FromStr};
-use std::{char, fmt};
+use thiserror::Error;
 
 /// This limit is set in order to avoid stack overflow error when parsing nested triples due to too many recursive calls.
 /// The actual limit value is a wet finger compromise between not failing to parse valid files and avoiding to trigger stack overflow errors.
@@ -166,11 +166,9 @@ impl FromStr for Variable {
                 "Variable serialization should start with ? or $",
             ));
         }
-        Self::new(&s[1..]).map_err(|error| Self::Err {
-            kind: TermParseErrorKind::Variable {
-                value: s.to_owned(),
-                error,
-            },
+        Self::new(&s[1..]).map_err(|error| Self::Err::Variable {
+            value: s.to_owned(),
+            error,
         })
     }
 }
@@ -183,11 +181,9 @@ fn read_named_node(s: &str) -> Result<(NamedNode, &str), TermParseError> {
             .ok_or_else(|| TermParseError::msg("Named node serialization should end with a >"))?;
         let (value, remain) = remain.split_at(end);
         let remain = &remain[1..];
-        let term = NamedNode::new(value).map_err(|error| TermParseError {
-            kind: TermParseErrorKind::Iri {
-                value: value.to_owned(),
-                error,
-            },
+        let term = NamedNode::new(value).map_err(|error| TermParseError::Iri {
+            value: value.to_owned(),
+            error,
         })?;
         Ok((term, remain))
     } else {
@@ -207,11 +203,9 @@ fn read_blank_node(s: &str) -> Result<(BlankNode, &str), TermParseError> {
             })
             .unwrap_or(remain.len());
         let (value, remain) = remain.split_at(end);
-        let term = BlankNode::new(value).map_err(|error| TermParseError {
-            kind: TermParseErrorKind::BlankNode {
-                value: value.to_owned(),
-                error,
-            },
+        let term = BlankNode::new(value).map_err(|error| TermParseError::BlankNode {
+            value: value.to_owned(),
+            error,
         })?;
         Ok((term, remain))
     } else {
@@ -237,11 +231,9 @@ fn read_literal(s: &str) -> Result<(Literal, &str), TermParseError> {
                         let (language, remain) = remain.split_at(end);
                         Ok((
                             Literal::new_language_tagged_literal(value, language).map_err(
-                                |error| TermParseError {
-                                    kind: TermParseErrorKind::LanguageTag {
-                                        value: language.to_owned(),
-                                        error,
-                                    },
+                                |error| TermParseError::LanguageTag {
+                                    value: language.to_owned(),
+                                    error,
                                 },
                             )?,
                             remain,
@@ -421,61 +413,31 @@ fn read_hexa_char(input: &mut Chars<'_>, len: usize) -> Result<char, TermParseEr
 }
 
 /// An error raised during term serialization parsing using the [`FromStr`] trait.
-#[derive(Debug)]
-pub struct TermParseError {
-    kind: TermParseErrorKind,
-}
-
-#[derive(Debug)]
-enum TermParseErrorKind {
-    Iri {
-        error: IriParseError,
-        value: String,
-    },
+#[derive(Debug, Error)]
+pub enum TermParseError {
+    #[error("Error while parsing the named node '{value}': {error}")]
+    Iri { error: IriParseError, value: String },
+    #[error("Error while parsing the blank node '{value}': {error}")]
     BlankNode {
         error: BlankNodeIdParseError,
         value: String,
     },
+    #[error("Error while parsing the language tag '{value}': {error}")]
     LanguageTag {
         error: LanguageTagParseError,
         value: String,
     },
+    #[error("Error while parsing the variable '{value}': {error}")]
     Variable {
         error: VariableNameParseError,
         value: String,
     },
-    Msg {
-        msg: &'static str,
-    },
+    #[error("{msg}")]
+    Msg { msg: &'static str },
 }
 
-impl fmt::Display for TermParseError {
-    #[inline]
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match &self.kind {
-            TermParseErrorKind::Iri { error, value } => {
-                write!(f, "Error while parsing the named node '{value}': {error}")
-            }
-            TermParseErrorKind::BlankNode { error, value } => {
-                write!(f, "Error while parsing the blank node '{value}': {error}")
-            }
-            TermParseErrorKind::LanguageTag { error, value } => {
-                write!(f, "Error while parsing the language tag '{value}': {error}")
-            }
-            TermParseErrorKind::Variable { error, value } => {
-                write!(f, "Error while parsing the variable '{value}': {error}")
-            }
-            TermParseErrorKind::Msg { msg } => f.write_str(msg),
-        }
-    }
-}
-
-impl Error for TermParseError {}
-
 impl TermParseError {
     pub(crate) fn msg(msg: &'static str) -> Self {
-        Self {
-            kind: TermParseErrorKind::Msg { msg },
-        }
+        Self::Msg { msg }
     }
 }

lib/oxrdfio/src/error.rs

@@ -1,6 +1,5 @@
-use std::error::Error;
+use std::io;
 use std::ops::Range;
-use std::{fmt, io};
 use thiserror::Error;
 
 /// Error returned during RDF format parsing.
@@ -16,18 +15,7 @@ pub enum ParseError {
 
 impl ParseError {
     pub(crate) fn msg(msg: &'static str) -> Self {
-        Self::Syntax(SyntaxError {
-            inner: SyntaxErrorKind::Msg { msg },
-        })
-    }
-}
-
-impl From<oxttl::SyntaxError> for SyntaxError {
-    #[inline]
-    fn from(error: oxttl::SyntaxError) -> Self {
-        Self {
-            inner: SyntaxErrorKind::Turtle(error),
-        }
+        Self::Syntax(SyntaxError::Msg { msg })
     }
 }
 
@@ -41,15 +29,6 @@ impl From<oxttl::ParseError> for ParseError {
     }
 }
 
-impl From<oxrdfxml::SyntaxError> for SyntaxError {
-    #[inline]
-    fn from(error: oxrdfxml::SyntaxError) -> Self {
-        Self {
-            inner: SyntaxErrorKind::RdfXml(error),
-        }
-    }
-}
-
 impl From<oxrdfxml::ParseError> for ParseError {
     #[inline]
     fn from(error: oxrdfxml::ParseError) -> Self {
@@ -71,15 +50,13 @@ impl From<ParseError> for io::Error {
 }
 
 /// An error in the syntax of the parsed file.
-#[derive(Debug)]
-pub struct SyntaxError {
-    inner: SyntaxErrorKind,
-}
-
-#[derive(Debug)]
-enum SyntaxErrorKind {
-    Turtle(oxttl::SyntaxError),
-    RdfXml(oxrdfxml::SyntaxError),
+#[derive(Debug, Error)]
+pub enum SyntaxError {
+    #[error(transparent)]
+    Turtle(#[from] oxttl::SyntaxError),
+    #[error(transparent)]
+    RdfXml(#[from] oxrdfxml::SyntaxError),
+    #[error("{msg}")]
     Msg { msg: &'static str },
 }
 
@@ -87,8 +64,8 @@ impl SyntaxError {
     /// The location of the error inside of the file.
     #[inline]
     pub fn location(&self) -> Option<Range<TextPosition>> {
-        match &self.inner {
-            SyntaxErrorKind::Turtle(e) => {
+        match &self {
+            Self::Turtle(e) => {
                 let location = e.location();
                 Some(
                     TextPosition {
@@ -102,29 +79,7 @@ impl SyntaxError {
                     },
                 )
             }
-            SyntaxErrorKind::RdfXml(_) | SyntaxErrorKind::Msg { .. } => None,
-        }
-    }
-}
-
-impl fmt::Display for SyntaxError {
-    #[inline]
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match &self.inner {
-            SyntaxErrorKind::Turtle(e) => e.fmt(f),
-            SyntaxErrorKind::RdfXml(e) => e.fmt(f),
-            SyntaxErrorKind::Msg { msg } => f.write_str(msg),
-        }
-    }
-}
-
-impl Error for SyntaxError {
-    #[inline]
-    fn source(&self) -> Option<&(dyn Error + 'static)> {
-        match &self.inner {
-            SyntaxErrorKind::Turtle(e) => Some(e),
-            SyntaxErrorKind::RdfXml(e) => Some(e),
-            SyntaxErrorKind::Msg { .. } => None,
+            Self::RdfXml(_) | Self::Msg { .. } => None,
         }
     }
 }
@@ -132,10 +87,10 @@ impl Error for SyntaxError {
 impl From<SyntaxError> for io::Error {
     #[inline]
     fn from(error: SyntaxError) -> Self {
-        match error.inner {
-            SyntaxErrorKind::Turtle(error) => error.into(),
-            SyntaxErrorKind::RdfXml(error) => error.into(),
-            SyntaxErrorKind::Msg { msg } => Self::new(io::ErrorKind::InvalidData, msg),
+        match error {
+            SyntaxError::Turtle(error) => error.into(),
+            SyntaxError::RdfXml(error) => error.into(),
+            SyntaxError::Msg { msg } => Self::new(io::ErrorKind::InvalidData, msg),
         }
     }
 }

lib/oxrdfxml/src/error.rs

@@ -1,8 +1,7 @@
 use oxilangtag::LanguageTagParseError;
 use oxiri::IriParseError;
-use std::error::Error;
+use std::io;
 use std::sync::Arc;
-use std::{fmt, io};
 use thiserror::Error;
 
 /// Error returned during RDF/XML parsing.
@@ -33,78 +32,45 @@ impl From<quick_xml::Error> for ParseError {
             quick_xml::Error::Io(error) => {
                 Self::Io(Arc::try_unwrap(error).unwrap_or_else(|e| io::Error::new(e.kind(), e)))
             }
-            _ => Self::Syntax(SyntaxError {
-                inner: SyntaxErrorKind::Xml(error),
-            }),
+            _ => Self::Syntax(SyntaxError::Xml(error)),
         }
     }
 }
 
 /// An error in the syntax of the parsed file.
-#[derive(Debug)]
-pub struct SyntaxError {
-    pub(crate) inner: SyntaxErrorKind,
-}
-
-#[derive(Debug)]
-pub enum SyntaxErrorKind {
-    Xml(quick_xml::Error),
+#[derive(Debug, Error)]
+pub enum SyntaxError {
+    #[error(transparent)]
+    Xml(#[from] quick_xml::Error),
+    #[error("error while parsing IRI '{iri}': {error}")]
     InvalidIri {
         iri: String,
+        #[source]
         error: IriParseError,
     },
+    #[error("error while parsing language tag '{tag}': {error}")]
     InvalidLanguageTag {
         tag: String,
+        #[source]
         error: LanguageTagParseError,
     },
-    Msg {
-        msg: String,
-    },
+    #[error("{msg}")]
+    Msg { msg: String },
 }
 
 impl SyntaxError {
     /// Builds an error from a printable error message.
     #[inline]
     pub(crate) fn msg(msg: impl Into<String>) -> Self {
-        Self {
-            inner: SyntaxErrorKind::Msg { msg: msg.into() },
-        }
-    }
-}
-
-impl fmt::Display for SyntaxError {
-    #[inline]
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match &self.inner {
-            SyntaxErrorKind::Xml(error) => error.fmt(f),
-            SyntaxErrorKind::InvalidIri { iri, error } => {
-                write!(f, "error while parsing IRI '{iri}': {error}")
-            }
-            SyntaxErrorKind::InvalidLanguageTag { tag, error } => {
-                write!(f, "error while parsing language tag '{tag}': {error}")
-            }
-            SyntaxErrorKind::Msg { msg } => f.write_str(msg),
-        }
-    }
-}
-
-impl Error for SyntaxError {
-    #[inline]
-    fn source(&self) -> Option<&(dyn Error + 'static)> {
-        match &self.inner {
-            SyntaxErrorKind::Xml(error) => Some(error),
-            SyntaxErrorKind::InvalidIri { error, .. } => Some(error),
-            SyntaxErrorKind::InvalidLanguageTag { error, .. } => Some(error),
-            SyntaxErrorKind::Msg { .. } => None,
-        }
+        Self::Msg { msg: msg.into() }
     }
 }
 
 impl From<SyntaxError> for io::Error {
     #[inline]
     fn from(error: SyntaxError) -> Self {
-        match error.inner {
-            SyntaxErrorKind::Xml(error) => match error {
+        match error {
+            SyntaxError::Xml(error) => match error {
                 quick_xml::Error::Io(error) => {
                     Arc::try_unwrap(error).unwrap_or_else(|e| Self::new(e.kind(), e))
                 }
@@ -113,7 +79,7 @@ impl From<SyntaxError> for io::Error {
                 }
                 _ => Self::new(io::ErrorKind::InvalidData, error),
             },
-            SyntaxErrorKind::Msg { msg } => Self::new(io::ErrorKind::InvalidData, msg),
+            SyntaxError::Msg { msg } => Self::new(io::ErrorKind::InvalidData, msg),
             _ => Self::new(io::ErrorKind::InvalidData, error),
         }
     }

lib/oxrdfxml/src/parser.rs

@@ -1,4 +1,4 @@
-use crate::error::{ParseError, SyntaxError, SyntaxErrorKind};
+use crate::error::{ParseError, SyntaxError};
 use crate::utils::*;
 use oxilangtag::LanguageTag;
 use oxiri::{Iri, IriParseError};
@@ -575,9 +575,7 @@ impl<R> RdfXmlReader<R> {
                         tag
                     } else {
                         LanguageTag::parse(tag.to_ascii_lowercase())
-                            .map_err(|error| SyntaxError {
-                                inner: SyntaxErrorKind::InvalidLanguageTag { tag, error },
-                            })?
+                            .map_err(|error| SyntaxError::InvalidLanguageTag { tag, error })?
                             .into_inner()
                     });
                 } else if attribute.key.as_ref() == b"xml:base" {
@@ -588,9 +586,7 @@ impl<R> RdfXmlReader<R> {
                         } else {
                             Iri::parse(iri.clone())
                         }
-                        .map_err(|error| SyntaxError {
-                            inner: SyntaxErrorKind::InvalidIri { iri, error },
-                        })?,
+                        .map_err(|error| SyntaxError::InvalidIri { iri, error })?,
                     )
                 } else {
                     // We ignore other xml attributes
@@ -1169,11 +1165,9 @@ impl<R> RdfXmlReader<R> {
                 } else {
                     base_iri.resolve(&relative_iri)
                 }
-                .map_err(|error| SyntaxError {
-                    inner: SyntaxErrorKind::InvalidIri {
-                        iri: relative_iri,
-                        error,
-                    },
+                .map_err(|error| SyntaxError::InvalidIri {
+                    iri: relative_iri,
+                    error,
                 })?
                 .into_inner(),
             ))
@@ -1187,11 +1181,9 @@ impl<R> RdfXmlReader<R> {
             relative_iri
         } else {
             Iri::parse(relative_iri.clone())
-                .map_err(|error| SyntaxError {
-                    inner: SyntaxErrorKind::InvalidIri {
-                        iri: relative_iri,
-                        error,
-                    },
+                .map_err(|error| SyntaxError::InvalidIri {
+                    iri: relative_iri,
+                    error,
                 })?
                 .into_inner()
         }))

lib/oxsdatatypes/Cargo.toml

@@ -13,6 +13,9 @@ documentation = "https://docs.rs/oxsdatatypes"
 edition.workspace = true
 rust-version.workspace = true
 
+[dependencies]
+thiserror.workspace = true
+
 [features]
 js = ["js-sys"]
 custom-now = []

lib/oxsdatatypes/src/date_time.rs

@@ -6,6 +6,7 @@ use std::error::Error;
 use std::fmt;
 use std::hash::{Hash, Hasher};
 use std::str::FromStr;
+use thiserror::Error;
 
 /// [XML Schema `dateTime` datatype](https://www.w3.org/TR/xmlschema11-2/#dateTime)
 ///
@@ -2039,42 +2040,24 @@ fn time_on_timeline(props: &DateTimeSevenPropertyModel) -> Option<Decimal> {
 }
 
 /// A parsing error
-#[derive(Debug, Clone)]
-pub struct ParseDateTimeError {
-    kind: ParseDateTimeErrorKind,
-}
-
-#[derive(Debug, Clone)]
-enum ParseDateTimeErrorKind {
+#[derive(Debug, Clone, Error)]
+pub enum ParseDateTimeError {
+    #[error("{day} is not a valid day of {month}")]
     InvalidDayOfMonth { day: u8, month: u8 },
-    Overflow(DateTimeOverflowError),
+    #[error(transparent)]
+    Overflow(#[from] DateTimeOverflowError),
+    #[error(transparent)]
     InvalidTimezone(InvalidTimezoneError),
+    #[error("{0}")]
     Message(&'static str),
 }
 
-impl fmt::Display for ParseDateTimeError {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match &self.kind {
-            ParseDateTimeErrorKind::InvalidDayOfMonth { day, month } => {
-                write!(f, "{day} is not a valid day of {month}")
-            }
-            ParseDateTimeErrorKind::Overflow(error) => error.fmt(f),
-            ParseDateTimeErrorKind::InvalidTimezone(error) => error.fmt(f),
-            ParseDateTimeErrorKind::Message(msg) => f.write_str(msg),
-        }
-    }
-}
-
 impl ParseDateTimeError {
     const fn msg(message: &'static str) -> Self {
-        Self {
-            kind: ParseDateTimeErrorKind::Message(message),
-        }
+        Self::Message(message)
     }
 }
 
-impl Error for ParseDateTimeError {}
-
 // [16]   dateTimeLexicalRep ::= yearFrag '-' monthFrag '-' dayFrag 'T' ((hourFrag ':' minuteFrag ':' secondFrag) | endOfDayFrag) timezoneFrag?
 fn date_time_lexical_rep(input: &str) -> Result<(DateTime, &str), ParseDateTimeError> {
     let (year, input) = year_frag(input)?;
@@ -2326,11 +2309,8 @@ fn timezone_frag(input: &str) -> Result<(TimezoneOffset, &str), ParseDateTimeErr
     }
 
     Ok((
-        TimezoneOffset::new(sign * (hours * 60 + i16::from(minutes))).map_err(|e| {
-            ParseDateTimeError {
-                kind: ParseDateTimeErrorKind::InvalidTimezone(e),
-            }
-        })?,
+        TimezoneOffset::new(sign * (hours * 60 + i16::from(minutes)))
+            .map_err(|e| ParseDateTimeError::InvalidTimezone(e))?,
         input,
     ))
 }
@@ -2400,9 +2380,7 @@ fn optional_end<T>(
 fn validate_day_of_month(year: Option<i64>, month: u8, day: u8) -> Result<(), ParseDateTimeError> {
     // Constraint: Day-of-month Values
     if day > days_in_month(year, month) {
-        return Err(ParseDateTimeError {
-            kind: ParseDateTimeErrorKind::InvalidDayOfMonth { day, month },
-        });
+        return Err(ParseDateTimeError::InvalidDayOfMonth { day, month });
     }
     Ok(())
 }
@@ -2421,14 +2399,6 @@ impl fmt::Display for DateTimeOverflowError {
 
 impl Error for DateTimeOverflowError {}
 
-impl From<DateTimeOverflowError> for ParseDateTimeError {
-    fn from(error: DateTimeOverflowError) -> Self {
-        Self {
-            kind: ParseDateTimeErrorKind::Overflow(error),
-        }
-    }
-}
-
 /// The value provided as timezone is not valid.
 ///
 /// Matches XPath [`FODT0003` error](https://www.w3.org/TR/xpath-functions-31/#ERRFODT0003).

lib/oxsdatatypes/src/decimal.rs

@@ -3,6 +3,7 @@ use std::error::Error;
 use std::fmt;
 use std::fmt::Write;
 use std::str::FromStr;
+use thiserror::Error;
 
 const DECIMAL_PART_DIGITS: u32 = 18;
 const DECIMAL_PART_POW: i128 = 1_000_000_000_000_000_000;
@@ -466,7 +467,7 @@ impl FromStr for Decimal {
         // (\+|-)?([0-9]+(\.[0-9]*)?|\.[0-9]+)
         let input = input.as_bytes();
         if input.is_empty() {
-            return Err(PARSE_UNEXPECTED_END);
+            return Err(ParseDecimalError::UnexpectedEnd);
         }
 
         let (sign, mut input) = match input.first() {
@@ -481,9 +482,9 @@ impl FromStr for Decimal {
             if c.is_ascii_digit() {
                 value = value
                     .checked_mul(10)
-                    .ok_or(PARSE_OVERFLOW)?
+                    .ok_or(ParseDecimalError::Overflow)?
                     .checked_add(sign * i128::from(*c - b'0'))
-                    .ok_or(PARSE_OVERFLOW)?;
+                    .ok_or(ParseDecimalError::Overflow)?;
                 input = &input[1..];
             } else {
                 break;
@@ -493,12 +494,12 @@ impl FromStr for Decimal {
         let mut exp = DECIMAL_PART_POW;
         if let Some(c) = input.first() {
             if *c != b'.' {
-                return Err(PARSE_UNEXPECTED_CHAR);
+                return Err(ParseDecimalError::UnexpectedChar);
             }
             input = &input[1..];
             if input.is_empty() && !with_before_dot {
                 // We only have a dot
-                return Err(PARSE_UNEXPECTED_END);
+                return Err(ParseDecimalError::UnexpectedEnd);
             }
             while input.last() == Some(&b'0') {
                 // Hack to avoid underflows
@@ -509,25 +510,25 @@ impl FromStr for Decimal {
                     exp /= 10;
                     value = value
                         .checked_mul(10)
-                        .ok_or(PARSE_OVERFLOW)?
+                        .ok_or(ParseDecimalError::Overflow)?
                         .checked_add(sign * i128::from(*c - b'0'))
-                        .ok_or(PARSE_OVERFLOW)?;
+                        .ok_or(ParseDecimalError::Overflow)?;
                     input = &input[1..];
                 } else {
-                    return Err(PARSE_UNEXPECTED_CHAR);
+                    return Err(ParseDecimalError::UnexpectedChar);
                 }
             }
             if exp == 0 {
                 // Underflow
-                return Err(PARSE_UNDERFLOW);
+                return Err(ParseDecimalError::Underflow);
             }
         } else if !with_before_dot {
             // It's empty
-            return Err(PARSE_UNEXPECTED_END);
+            return Err(ParseDecimalError::UnexpectedEnd);
         }
 
         Ok(Self {
-            value: value.checked_mul(exp).ok_or(PARSE_OVERFLOW)?,
+            value: value.checked_mul(exp).ok_or(ParseDecimalError::Overflow)?,
         })
     }
 }
@@ -609,50 +610,21 @@ impl fmt::Display for Decimal {
 }
 
 /// An error when parsing a [`Decimal`].
-#[derive(Debug, Clone)]
-pub struct ParseDecimalError {
-    kind: DecimalParseErrorKind,
-}
-
-#[derive(Debug, Clone)]
-enum DecimalParseErrorKind {
+#[derive(Debug, Clone, Error)]
+pub enum ParseDecimalError {
+    #[error("Value overflow")]
     Overflow,
+    #[error("Value underflow")]
     Underflow,
+    #[error("Unexpected character")]
     UnexpectedChar,
+    #[error("Unexpected end of string")]
     UnexpectedEnd,
 }
 
-const PARSE_OVERFLOW: ParseDecimalError = ParseDecimalError {
-    kind: DecimalParseErrorKind::Overflow,
-};
-const PARSE_UNDERFLOW: ParseDecimalError = ParseDecimalError {
-    kind: DecimalParseErrorKind::Underflow,
-};
-const PARSE_UNEXPECTED_CHAR: ParseDecimalError = ParseDecimalError {
-    kind: DecimalParseErrorKind::UnexpectedChar,
-};
-const PARSE_UNEXPECTED_END: ParseDecimalError = ParseDecimalError {
-    kind: DecimalParseErrorKind::UnexpectedEnd,
-};
-
-impl fmt::Display for ParseDecimalError {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self.kind {
-            DecimalParseErrorKind::Overflow => f.write_str("Value overflow"),
-            DecimalParseErrorKind::Underflow => f.write_str("Value underflow"),
-            DecimalParseErrorKind::UnexpectedChar => f.write_str("Unexpected character"),
-            DecimalParseErrorKind::UnexpectedEnd => f.write_str("Unexpected end of string"),
-        }
-    }
-}
-
-impl Error for ParseDecimalError {}
-
 impl From<TooLargeForDecimalError> for ParseDecimalError {
     fn from(_: TooLargeForDecimalError) -> Self {
-        Self {
-            kind: DecimalParseErrorKind::Overflow,
-        }
+        Self::Overflow
     }
 }
 

lib/sparesults/src/csv.rs

@@ -1,6 +1,6 @@
 //! Implementation of [SPARQL 1.1 Query Results CSV and TSV Formats](https://www.w3.org/TR/sparql11-results-csv-tsv/)
 
-use crate::error::{ParseError, SyntaxError, SyntaxErrorKind, TextPosition};
+use crate::error::{ParseError, SyntaxError, TextPosition};
 use memchr::memchr;
 use oxrdf::vocab::xsd;
 use oxrdf::*;
@@ -508,23 +508,21 @@ impl<R: Read> TsvSolutionsReader<R> {
                             .sum::<usize>();
                         let start_position_bytes =
                             line.split('\t').take(i).map(|c| c.len() + 1).sum::<usize>();
-                        SyntaxError {
-                            inner: SyntaxErrorKind::Term {
-                                error: e,
-                                term: v.into(),
-                                location: TextPosition {
-                                    line: self.reader.line_count - 1,
-                                    column: start_position_char.try_into().unwrap(),
-                                    offset: self.reader.last_line_start
-                                        + u64::try_from(start_position_bytes).unwrap(),
-                                }..TextPosition {
-                                    line: self.reader.line_count - 1,
-                                    column: (start_position_char + v.chars().count())
-                                        .try_into()
-                                        .unwrap(),
-                                    offset: self.reader.last_line_start
-                                        + u64::try_from(start_position_bytes + v.len()).unwrap(),
-                                },
+                        SyntaxError::Term {
+                            error: e,
+                            term: v.into(),
+                            location: TextPosition {
+                                line: self.reader.line_count - 1,
+                                column: start_position_char.try_into().unwrap(),
+                                offset: self.reader.last_line_start
+                                    + u64::try_from(start_position_bytes).unwrap(),
+                            }..TextPosition {
+                                line: self.reader.line_count - 1,
+                                column: (start_position_char + v.chars().count())
+                                    .try_into()
+                                    .unwrap(),
+                                offset: self.reader.last_line_start
+                                    + u64::try_from(start_position_bytes + v.len()).unwrap(),
                             },
                         }
                     })?))

lib/sparesults/src/error.rs

@@ -1,8 +1,7 @@
 use oxrdf::TermParseError;
-use std::error::Error;
+use std::io;
 use std::ops::Range;
 use std::sync::Arc;
-use std::{fmt, io};
 use thiserror::Error;
 
 /// Error returned during SPARQL result formats format parsing.
@@ -42,28 +41,26 @@ impl From<quick_xml::Error> for ParseError {
             quick_xml::Error::Io(error) => {
                 Self::Io(Arc::try_unwrap(error).unwrap_or_else(|e| io::Error::new(e.kind(), e)))
             }
-            _ => Self::Syntax(SyntaxError {
-                inner: SyntaxErrorKind::Xml(error),
-            }),
+            _ => Self::Syntax(SyntaxError::Xml(error)),
         }
     }
 }
 
 /// An error in the syntax of the parsed file.
-#[derive(Debug)]
-pub struct SyntaxError {
-    pub(crate) inner: SyntaxErrorKind,
-}
-
-#[derive(Debug)]
-pub(crate) enum SyntaxErrorKind {
-    Json(json_event_parser::SyntaxError),
-    Xml(quick_xml::Error),
+#[derive(Debug, Error)]
+pub enum SyntaxError {
+    #[error(transparent)]
+    Json(#[from] json_event_parser::SyntaxError),
+    #[error(transparent)]
+    Xml(#[from] quick_xml::Error),
+    #[error("Error {error} on '{term}' in line {}", location.start.line + 1)]
     Term {
+        #[source]
         error: TermParseError,
         term: String,
         location: Range<TextPosition>,
     },
+    #[error("{msg}")]
     Msg {
         msg: String,
         location: Option<Range<TextPosition>>,
@@ -74,30 +71,26 @@ impl SyntaxError {
     /// Builds an error from a printable error message.
     #[inline]
     pub(crate) fn msg(msg: impl Into<String>) -> Self {
-        Self {
-            inner: SyntaxErrorKind::Msg {
-                msg: msg.into(),
-                location: None,
-            },
+        Self::Msg {
+            msg: msg.into(),
+            location: None,
         }
     }
 
     /// Builds an error from a printable error message and a location
     #[inline]
     pub(crate) fn located_message(msg: impl Into<String>, location: Range<TextPosition>) -> Self {
-        Self {
-            inner: SyntaxErrorKind::Msg {
-                msg: msg.into(),
-                location: Some(location),
-            },
+        Self::Msg {
+            msg: msg.into(),
+            location: Some(location),
         }
     }
 
     /// The location of the error inside of the file.
     #[inline]
     pub fn location(&self) -> Option<Range<TextPosition>> {
-        match &self.inner {
-            SyntaxErrorKind::Json(e) => {
+        match self {
+            Self::Json(e) => {
                 let location = e.location();
                 Some(
                     TextPosition {
@@ -111,37 +104,9 @@ impl SyntaxError {
                     },
                 )
             }
-            SyntaxErrorKind::Term { location, .. } => Some(location.clone()),
-            SyntaxErrorKind::Msg { location, .. } => location.clone(),
-            SyntaxErrorKind::Xml(_) => None,
-        }
-    }
-}
-
-impl fmt::Display for SyntaxError {
-    #[inline]
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match &self.inner {
-            SyntaxErrorKind::Json(e) => e.fmt(f),
-            SyntaxErrorKind::Xml(e) => e.fmt(f),
-            SyntaxErrorKind::Term {
-                error,
-                term,
-                location,
-            } => write!(f, "{error} on '{term}' in line {}", location.start.line + 1),
-            SyntaxErrorKind::Msg { msg, .. } => f.write_str(msg),
-        }
-    }
-}
-
-impl Error for SyntaxError {
-    #[inline]
-    fn source(&self) -> Option<&(dyn Error + 'static)> {
-        match &self.inner {
-            SyntaxErrorKind::Json(e) => Some(e),
-            SyntaxErrorKind::Xml(e) => Some(e),
-            SyntaxErrorKind::Term { error, .. } => Some(error),
-            SyntaxErrorKind::Msg { .. } => None,
+            Self::Term { location, .. } => Some(location.clone()),
+            Self::Msg { location, .. } => location.clone(),
+            Self::Xml(_) => None,
         }
     }
 }
@@ -149,9 +114,9 @@ impl Error for SyntaxError {
 impl From<SyntaxError> for io::Error {
     #[inline]
     fn from(error: SyntaxError) -> Self {
-        match error.inner {
-            SyntaxErrorKind::Json(error) => Self::new(io::ErrorKind::InvalidData, error),
-            SyntaxErrorKind::Xml(error) => match error {
+        match error {
+            SyntaxError::Json(error) => Self::new(io::ErrorKind::InvalidData, error),
+            SyntaxError::Xml(error) => match error {
                 quick_xml::Error::Io(error) => {
                     Arc::try_unwrap(error).unwrap_or_else(|e| Self::new(e.kind(), e))
                 }
@@ -160,16 +125,8 @@ impl From<SyntaxError> for io::Error {
                 }
                 _ => Self::new(io::ErrorKind::InvalidData, error),
             },
-            SyntaxErrorKind::Term { .. } => Self::new(io::ErrorKind::InvalidData, error),
-            SyntaxErrorKind::Msg { msg, .. } => Self::new(io::ErrorKind::InvalidData, msg),
-        }
-    }
-}
-
-impl From<json_event_parser::SyntaxError> for SyntaxError {
-    fn from(error: json_event_parser::SyntaxError) -> Self {
-        Self {
-            inner: SyntaxErrorKind::Json(error),
+            SyntaxError::Term { .. } => Self::new(io::ErrorKind::InvalidData, error),
+            SyntaxError::Msg { msg, .. } => Self::new(io::ErrorKind::InvalidData, msg),
         }
     }
 }

lib/spargebra/Cargo.toml

@@ -25,6 +25,7 @@ oxiri.workspace = true
 oxrdf.workspace = true
 peg.workspace = true
 rand.workspace = true
+thiserror.workspace = true
 
 [lints]
 workspace = true

lib/spargebra/src/parser.rs

@@ -9,26 +9,22 @@ use oxrdf::vocab::{rdf, xsd};
 use peg::parser;
 use peg::str::LineCol;
 use rand::random;
+use std::char;
 use std::collections::{HashMap, HashSet};
-use std::error::Error;
 use std::mem::take;
 use std::str::FromStr;
-use std::{char, fmt};
+use thiserror::Error;
 
 /// Parses a SPARQL query with an optional base IRI to resolve relative IRIs in the query.
 pub fn parse_query(query: &str, base_iri: Option<&str>) -> Result<Query, ParseError> {
     let mut state = ParserState::from_base_iri(base_iri)?;
-    parser::QueryUnit(query, &mut state).map_err(|e| ParseError {
-        inner: ParseErrorKind::Parser(e),
-    })
+    parser::QueryUnit(query, &mut state).map_err(|e| ParseError::Parser(e))
 }
 
 /// Parses a SPARQL update with an optional base IRI to resolve relative IRIs in the query.
 pub fn parse_update(update: &str, base_iri: Option<&str>) -> Result<Update, ParseError> {
     let mut state = ParserState::from_base_iri(base_iri)?;
-    let operations = parser::UpdateInit(update, &mut state).map_err(|e| ParseError {
-        inner: ParseErrorKind::Parser(e),
-    })?;
+    let operations = parser::UpdateInit(update, &mut state).map_err(|e| ParseError::Parser(e))?;
     Ok(Update {
         operations,
         base_iri: state.base_iri,
@@ -36,37 +32,12 @@ pub fn parse_update(update: &str, base_iri: Option<&str>) -> Result<Update, Pars
 }
 
 /// Error returned during SPARQL parsing.
-#[derive(Debug)]
-pub struct ParseError {
-    inner: ParseErrorKind,
-}
-
-#[derive(Debug)]
-enum ParseErrorKind {
-    InvalidBaseIri(IriParseError),
-    Parser(peg::error::ParseError<LineCol>),
-}
-
-impl fmt::Display for ParseError {
-    #[inline]
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match &self.inner {
-            ParseErrorKind::InvalidBaseIri(e) => {
-                write!(f, "Invalid SPARQL base IRI provided: {e}")
-            }
-            ParseErrorKind::Parser(e) => e.fmt(f),
-        }
-    }
-}
-
-impl Error for ParseError {
-    #[inline]
-    fn source(&self) -> Option<&(dyn Error + 'static)> {
-        match &self.inner {
-            ParseErrorKind::InvalidBaseIri(e) => Some(e),
-            ParseErrorKind::Parser(e) => Some(e),
-        }
-    }
+#[derive(Debug, Error)]
+pub enum ParseError {
+    #[error("Invalid SPARQL base IRI provided: {0}")]
+    InvalidBaseIri(#[from] IriParseError),
+    #[error(transparent)]
+    Parser(#[from] peg::error::ParseError<LineCol>),
 }
 
 struct AnnotatedTerm {
@@ -697,9 +668,7 @@ impl ParserState {
     pub(crate) fn from_base_iri(base_iri: Option<&str>) -> Result<Self, ParseError> {
         Ok(Self {
             base_iri: if let Some(base_iri) = base_iri {
-                Some(Iri::parse(base_iri.to_owned()).map_err(|e| ParseError {
-                    inner: ParseErrorKind::InvalidBaseIri(e),
-                })?)
+                Some(Iri::parse(base_iri.to_owned()).map_err(|e| ParseError::InvalidBaseIri(e))?)
             } else {
                 None
             },