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TermParseError

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pull/775/head
Yuri Astrakhan 1 year ago
parent bbec57ceb6
commit 5adf00aba9
1 changed files with 54 additions and 43 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 93
      lib/oxrdf/src/parser.rs

93
lib/oxrdf/src/parser.rs
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@ -29,9 +29,9 @@ impl FromStr for NamedNode {
fn from_str(s: &str) -> Result<Self, Self::Err> {
let (term, left) = read_named_node(s)?;
if !left.is_empty() {
return Err(Self::Err::msg(
return Err(TermParseErrorKind::msg(
"Named node serialization should end with a >",
));
))?;
}
Ok(term)
}
@ -54,9 +54,9 @@ impl FromStr for BlankNode {
fn from_str(s: &str) -> Result<Self, Self::Err> {
let (term, left) = read_blank_node(s)?;
if !left.is_empty() {
return Err(Self::Err::msg(
return Err(TermParseErrorKind::msg(
"Blank node serialization should not contain whitespaces",
));
))?;
}
Ok(term)
}
@ -107,7 +107,7 @@ impl FromStr for Literal {
fn from_str(s: &str) -> Result<Self, Self::Err> {
let (term, left) = read_literal(s)?;
if !left.is_empty() {
return Err(Self::Err::msg("Invalid literal serialization"));
return Err(TermParseErrorKind::msg("Invalid literal serialization"))?;
}
Ok(term)
}
@ -139,7 +139,7 @@ impl FromStr for Term {
fn from_str(s: &str) -> Result<Self, Self::Err> {
let (term, left) = read_term(s, 0)?;
if !left.is_empty() {
return Err(Self::Err::msg("Invalid term serialization"));
return Err(TermParseErrorKind::msg("Invalid term serialization"))?;
}
Ok(term)
}
@ -161,38 +161,40 @@ impl FromStr for Variable {
/// ```
fn from_str(s: &str) -> Result<Self, Self::Err> {
if !s.starts_with('?') && !s.starts_with('$') {
return Err(Self::Err::msg(
return Err(TermParseErrorKind::msg(
"Variable serialization should start with ? or $",
));
))?;
}
Self::new(&s[1..]).map_err(|error| Self::Err::Variable {
Ok(
Self::new(&s[1..]).map_err(|error| TermParseErrorKind::Variable {
value: s.to_owned(),
error,
})
})?,
)
}
}
fn read_named_node(s: &str) -> Result<(NamedNode, &str), TermParseError> {
fn read_named_node(s: &str) -> Result<(NamedNode, &str), TermParseErrorKind> {
let s = s.trim();
if let Some(remain) = s.strip_prefix('<') {
let end = remain
.find('>')
.ok_or_else(|| TermParseError::msg("Named node serialization should end with a >"))?;
let end = remain.find('>').ok_or_else(|| {
TermParseErrorKind::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::Iri {
let term = NamedNode::new(value).map_err(|error| TermParseErrorKind::Iri {
value: value.to_owned(),
error,
})?;
Ok((term, remain))
} else {
Err(TermParseError::msg(
Err(TermParseErrorKind::msg(
"Named node serialization should start with a <",
))
}
}
fn read_blank_node(s: &str) -> Result<(BlankNode, &str), TermParseError> {
fn read_blank_node(s: &str) -> Result<(BlankNode, &str), TermParseErrorKind> {
let s = s.trim();
if let Some(remain) = s.strip_prefix("_:") {
let end = remain
@ -202,19 +204,19 @@ 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::BlankNode {
let term = BlankNode::new(value).map_err(|error| TermParseErrorKind::BlankNode {
value: value.to_owned(),
error,
})?;
Ok((term, remain))
} else {
Err(TermParseError::msg(
Err(TermParseErrorKind::msg(
"Blank node serialization should start with '_:'",
))
))?
}
}
fn read_literal(s: &str) -> Result<(Literal, &str), TermParseError> {
fn read_literal(s: &str) -> Result<(Literal, &str), TermParseErrorKind> {
let s = s.trim();
if let Some(s) = s.strip_prefix('"') {
let mut value = String::with_capacity(s.len());
@ -230,7 +232,7 @@ 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::LanguageTag {
|error| TermParseErrorKind::LanguageTag {
value: language.to_owned(),
error,
},
@ -257,16 +259,16 @@ fn read_literal(s: &str) -> Result<(Literal, &str), TermParseError> {
'\\' => '\\',
'u' => read_hexa_char(&mut chars, 4)?,
'U' => read_hexa_char(&mut chars, 8)?,
_ => return Err(TermParseError::msg("Unexpected escaped char")),
_ => return Err(TermParseErrorKind::msg("Unexpected escaped char"))?,
})
} else {
return Err(TermParseError::msg("Unexpected literal end"));
return Err(TermParseErrorKind::msg("Unexpected literal end"));
}
}
_ => value.push(c),
}
}
Err(TermParseError::msg("Unexpected literal end"))
Err(TermParseErrorKind::msg("Unexpected literal end"))
} else if let Some(remain) = s.strip_prefix("true") {
Ok((Literal::new_typed_literal("true", xsd::BOOLEAN), remain))
} else if let Some(remain) = s.strip_prefix("false") {
@ -274,7 +276,7 @@ fn read_literal(s: &str) -> Result<(Literal, &str), TermParseError> {
} else {
let input = s.as_bytes();
if input.is_empty() {
return Err(TermParseError::msg("Empty term serialization"));
return Err(TermParseErrorKind::msg("Empty term serialization"));
}
let mut cursor = match input.first() {
@ -313,7 +315,7 @@ fn read_literal(s: &str) -> Result<(Literal, &str), TermParseError> {
if count_exponent > 0 {
Ok((Literal::new_typed_literal(s, xsd::DOUBLE), &s[cursor..]))
} else {
Err(TermParseError::msg(
Err(TermParseErrorKind::msg(
"Double serialization with an invalid exponent",
))
}
@ -321,21 +323,24 @@ fn read_literal(s: &str) -> Result<(Literal, &str), TermParseError> {
if count_after > 0 {
Ok((Literal::new_typed_literal(s, xsd::DECIMAL), &s[cursor..]))
} else {
Err(TermParseError::msg(
Err(TermParseErrorKind::msg(
"Decimal serialization without floating part",
))
}
} else if count_before > 0 {
Ok((Literal::new_typed_literal(s, xsd::INTEGER), &s[cursor..]))
} else {
Err(TermParseError::msg("Empty integer serialization"))
Err(TermParseErrorKind::msg("Empty integer serialization"))
}
}
}
fn read_term(s: &str, number_of_recursive_calls: usize) -> Result<(Term, &str), TermParseError> {
fn read_term(
s: &str,
number_of_recursive_calls: usize,
) -> Result<(Term, &str), TermParseErrorKind> {
if number_of_recursive_calls == MAX_NUMBER_OF_NESTED_TRIPLES {
return Err(TermParseError::msg(
return Err(TermParseErrorKind::msg(
"Too many nested triples. The parser fails here to avoid a stack overflow.",
));
}
@ -355,7 +360,7 @@ fn read_term(s: &str, number_of_recursive_calls: usize) -> Result<(Term, &str),
Term::NamedNode(s) => s.into(),
Term::BlankNode(s) => s.into(),
Term::Literal(_) => {
return Err(TermParseError::msg(
return Err(TermParseErrorKind::msg(
"Literals are not allowed in subject position",
))
}
@ -368,14 +373,14 @@ fn read_term(s: &str, number_of_recursive_calls: usize) -> Result<(Term, &str),
remain,
))
} else {
Err(TermParseError::msg(
Err(TermParseErrorKind::msg(
"Nested triple serialization should be enclosed between << and >>",
))
}
}
#[cfg(not(feature = "rdf-star"))]
{
Err(TermParseError::msg("RDF-star is not supported"))
Err(TermParseErrorKind::msg("RDF-star is not supported"))
}
} else if s.starts_with('<') {
let (term, remain) = read_named_node(s)?;
@ -389,7 +394,7 @@ fn read_term(s: &str, number_of_recursive_calls: usize) -> Result<(Term, &str),
}
}
fn read_hexa_char(input: &mut Chars<'_>, len: usize) -> Result<char, TermParseError> {
fn read_hexa_char(input: &mut Chars<'_>, len: usize) -> Result<char, TermParseErrorKind> {
let mut value = 0;
for _ in 0..len {
if let Some(c) = input.next() {
@ -399,21 +404,27 @@ fn read_hexa_char(input: &mut Chars<'_>, len: usize) -> Result<char, TermParseEr
'a'..='f' => u32::from(c) - u32::from('a') + 10,
'A'..='F' => u32::from(c) - u32::from('A') + 10,
_ => {
return Err(TermParseError::msg(
return Err(TermParseErrorKind::msg(
"Unexpected character in a unicode escape",
))
}
}
} else {
return Err(TermParseError::msg("Unexpected literal string end"));
return Err(TermParseErrorKind::msg("Unexpected literal string end"));
}
}
char::from_u32(value).ok_or_else(|| TermParseError::msg("Invalid encoded unicode code point"))
char::from_u32(value)
.ok_or_else(|| TermParseErrorKind::msg("Invalid encoded unicode code point"))
}
/// An error raised during term serialization parsing using the [`FromStr`] trait.
#[derive(Debug, thiserror::Error)]
pub enum TermParseError {
#[error(transparent)]
pub struct TermParseError(#[from] TermParseErrorKind);
/// An internal error raised during term serialization parsing using the [`FromStr`] trait.
#[derive(Debug, thiserror::Error)]
enum TermParseErrorKind {
#[error("Error while parsing the named node '{value}': {error}")]
Iri { error: IriParseError, value: String },
#[error("Error while parsing the blank node '{value}': {error}")]
@ -435,8 +446,8 @@ pub enum TermParseError {
Msg { msg: &'static str },
}
impl TermParseError {
impl TermParseErrorKind {
pub(crate) fn msg(msg: &'static str) -> Self {
Self::Msg { msg }
TermParseErrorKind::Msg { msg }
}
}

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