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Follow up on Triple::from_terms

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pull/808/head
Tpt 10 months ago committed by Thomas Tanon
parent d361e1d283
commit f7d132f317
6 changed files with 123 additions and 499 deletions
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  1. 52
      lib/oxrdf/src/blank_node.rs
  2. 38
      lib/oxrdf/src/cast_error.rs
  3. 4
      lib/oxrdf/src/lib.rs
  4. 64
      lib/oxrdf/src/literal.rs
  5. 70
      lib/oxrdf/src/named_node.rs
  6. 386
      lib/oxrdf/src/triple.rs

52
lib/oxrdf/src/blank_node.rs
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@ -1,4 +1,3 @@
use crate::{Term, TryFromTermError};
use rand::random;
use std::io::Write;
use std::{fmt, str};
@ -233,22 +232,6 @@ impl<'a> From<BlankNodeRef<'a>> for BlankNode {
}
}
impl TryFrom<Term> for BlankNode {
type Error = TryFromTermError;
#[inline]
fn try_from(term: Term) -> Result<Self, Self::Error> {
if let Term::BlankNode(node) = term {
Ok(node)
} else {
Err(TryFromTermError {
term,
target: "BlankNode",
})
}
}
}
impl PartialEq<BlankNode> for BlankNodeRef<'_> {
#[inline]
fn eq(&self, other: &BlankNode) -> bool {
@ -369,8 +352,6 @@ pub struct BlankNodeIdParseError;
mod tests {
#![allow(clippy::panic_in_result_fn)]
use crate::{Literal, NamedNode};
use super::*;
#[test]
@ -379,39 +360,6 @@ mod tests {
assert_eq!(b.as_str(), "42");
}
#[test]
fn casting() {
let bnode: Result<BlankNode, TryFromTermError> =
Term::BlankNode(BlankNode::new_from_unique_id(0x42)).try_into();
assert_eq!(bnode.unwrap(), BlankNode::new_from_unique_id(0x42));
let literal: Result<BlankNode, TryFromTermError> =
Term::Literal(Literal::new_simple_literal("Hello World!")).try_into();
assert_eq!(literal.is_err(), true);
let err = literal.unwrap_err();
assert_eq!(
err.to_string(),
"\"Hello World!\" can not be converted to a BlankNode"
);
assert_eq!(
Term::from(err),
Term::Literal(Literal::new_simple_literal("Hello World!"))
);
let named_node: Result<BlankNode, TryFromTermError> =
Term::NamedNode(NamedNode::new("http://example.org/test").unwrap()).try_into();
assert_eq!(named_node.is_err(), true);
let named_node_error = named_node.unwrap_err();
assert_eq!(
named_node_error.to_string(),
"<http://example.org/test> can not be converted to a BlankNode"
);
assert_eq!(
Term::from(named_node_error),
Term::NamedNode(NamedNode::new("http://example.org/test").unwrap())
);
}
#[test]
fn as_str_full() {
let b = BlankNode::new_from_unique_id(0x7777_6666_5555_4444_3333_2222_1111_0000);

38
lib/oxrdf/src/cast_error.rs
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@ -1,38 +0,0 @@
use std::{fmt, str};
use crate::{NamedNode, Subject, Term};
// An error return if trying to cast a term as something it cannot be converted to.
#[derive(Debug, Clone, thiserror::Error)]
#[error("{term} can not be converted to a {target}")]
pub struct TryFromTermError {
pub(crate) term: Term,
pub(crate) target: &'static str,
}
impl From<TryFromTermError> for Term {
#[inline]
fn from(error: TryFromTermError) -> Self {
error.term
}
}
// An error return if trying to construct an invalid triple.
#[derive(Debug, thiserror::Error)]
pub struct TripleConstructionError {
pub(crate) subject: Result<Subject, TryFromTermError>,
pub(crate) predicate: Result<NamedNode, TryFromTermError>,
#[allow(dead_code)]
pub(crate) object: Term,
}
impl fmt::Display for TripleConstructionError {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match (self.subject.clone().err(), self.predicate.clone().err()) {
(Some(e), Some(e2)) => write!(f, "subject: [{}], predicate: [{}]", e, e2),
(Some(e), _) => write!(f, "subject: [{}]", e),
(_, Some(e)) => write!(f, "predicate: [{}]", e),
_ => write!(f, "No Errors"),
}
}
}

4
lib/oxrdf/src/lib.rs
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@ -5,7 +5,6 @@
#![doc(html_logo_url = "https://raw.githubusercontent.com/oxigraph/oxigraph/main/logo.svg")]
mod blank_node;
mod cast_error;
pub mod dataset;
pub mod graph;
mod interning;
@ -17,7 +16,6 @@ mod variable;
pub mod vocab;
pub use crate::blank_node::{BlankNode, BlankNodeIdParseError, BlankNodeRef};
pub use crate::cast_error::{TripleConstructionError, TryFromTermError};
pub use crate::dataset::Dataset;
pub use crate::graph::Graph;
pub use crate::literal::{Literal, LiteralRef};
@ -25,7 +23,7 @@ pub use crate::named_node::{NamedNode, NamedNodeRef};
pub use crate::parser::TermParseError;
pub use crate::triple::{
GraphName, GraphNameRef, NamedOrBlankNode, NamedOrBlankNodeRef, Quad, QuadRef, Subject,
SubjectRef, Term, TermRef, Triple, TripleRef,
SubjectRef, Term, TermRef, Triple, TripleRef, TryFromTermError,
};
pub use crate::variable::{Variable, VariableNameParseError, VariableRef};
pub use oxilangtag::LanguageTagParseError;

64
lib/oxrdf/src/literal.rs
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@ -1,6 +1,5 @@
use crate::named_node::NamedNode;
use crate::named_node::{NamedNode, NamedNodeRef};
use crate::vocab::{rdf, xsd};
use crate::{NamedNodeRef, Term, TryFromTermError};
use oxilangtag::{LanguageTag, LanguageTagParseError};
#[cfg(feature = "oxsdatatypes")]
use oxsdatatypes::*;
@ -422,22 +421,6 @@ impl From<DayTimeDuration> for Literal {
}
}
impl TryFrom<Term> for Literal {
type Error = TryFromTermError;
#[inline]
fn try_from(term: Term) -> Result<Self, Self::Error> {
if let Term::Literal(node) = term {
Ok(node)
} else {
Err(TryFromTermError {
term,
target: "Literal",
})
}
}
}
/// A borrowed RDF [literal](https://www.w3.org/TR/rdf11-concepts/#dfn-literal).
///
/// The default string formatter is returning an N-Triples, Turtle, and SPARQL compatible representation:
@ -654,7 +637,6 @@ mod tests {
#![allow(clippy::panic_in_result_fn)]
use super::*;
use crate::BlankNode;
#[test]
fn test_simple_literal_equality() {
@ -676,50 +658,6 @@ mod tests {
);
}
#[test]
fn casting() {
let literal: Result<Literal, TryFromTermError> =
Term::Literal(Literal::new_simple_literal("Hello World!")).try_into();
assert_eq!(
literal.unwrap(),
Literal::new_simple_literal("Hello World!")
);
let bnode: Result<Literal, TryFromTermError> =
Term::BlankNode(BlankNode::new_from_unique_id(0x42)).try_into();
let bnode_err = bnode.unwrap_err();
assert_eq!(
bnode_err.term,
Term::BlankNode(BlankNode::new_from_unique_id(0x42))
);
assert_eq!(bnode_err.target, "Literal");
assert_eq!(
bnode_err.to_string(),
"_:42 can not be converted to a Literal"
);
assert_eq!(
Term::from(bnode_err),
Term::BlankNode(BlankNode::new_from_unique_id(0x42))
);
let named_node: Result<Literal, TryFromTermError> =
Term::NamedNode(NamedNode::new("http://example.org/test").unwrap()).try_into();
let named_node_err = named_node.unwrap_err();
assert_eq!(
named_node_err.term,
Term::NamedNode(NamedNode::new("http://example.org/test").unwrap())
);
assert_eq!(named_node_err.target, "Literal");
assert_eq!(
named_node_err.to_string(),
"<http://example.org/test> can not be converted to a Literal"
);
assert_eq!(
Term::from(named_node_err),
Term::NamedNode(NamedNode::new("http://example.org/test").unwrap())
);
}
#[test]
fn test_float_format() {
assert_eq!("INF", Literal::from(f32::INFINITY).value());

70
lib/oxrdf/src/named_node.rs
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@ -1,4 +1,3 @@
use crate::{Term, TryFromTermError};
use oxiri::{Iri, IriParseError};
use std::cmp::Ordering;
use std::fmt;
@ -235,72 +234,3 @@ impl<'a> From<Iri<&'a str>> for NamedNodeRef<'a> {
}
}
}
impl TryFrom<Term> for NamedNode {
type Error = TryFromTermError;
#[inline]
fn try_from(term: Term) -> Result<Self, Self::Error> {
if let Term::NamedNode(node) = term {
Ok(node)
} else {
Err(TryFromTermError {
term,
target: "NamedNode",
})
}
}
}
#[cfg(test)]
mod tests {
#![allow(clippy::panic_in_result_fn)]
use crate::{BlankNode, Literal};
use super::*;
#[test]
fn casting() {
let named_node: Result<NamedNode, TryFromTermError> =
Term::NamedNode(NamedNode::new("http://example.org/test").unwrap()).try_into();
assert_eq!(
named_node.unwrap(),
NamedNode::new("http://example.org/test").unwrap()
);
let literal: Result<NamedNode, TryFromTermError> =
Term::Literal(Literal::new_simple_literal("Hello World!")).try_into();
let literal_err = literal.unwrap_err();
assert_eq!(
literal_err.term,
Term::Literal(Literal::new_simple_literal("Hello World!"))
);
assert_eq!(literal_err.target, "NamedNode");
assert_eq!(
literal_err.to_string(),
"\"Hello World!\" can not be converted to a NamedNode"
);
assert_eq!(
Term::from(literal_err),
Term::Literal(Literal::new_simple_literal("Hello World!"))
);
let bnode: Result<NamedNode, TryFromTermError> =
Term::BlankNode(BlankNode::new_from_unique_id(0x42)).try_into();
let bnode_err = bnode.unwrap_err();
assert_eq!(
bnode_err.term,
Term::BlankNode(BlankNode::new_from_unique_id(0x42))
);
assert_eq!(bnode_err.target, "NamedNode");
assert_eq!(
bnode_err.to_string(),
"_:42 can not be converted to a NamedNode"
);
assert_eq!(
Term::from(bnode_err),
Term::BlankNode(BlankNode::new_from_unique_id(0x42))
);
}
}

386
lib/oxrdf/src/triple.rs
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@ -1,8 +1,7 @@
use crate::blank_node::BlankNode;
use crate::cast_error::TripleConstructionError;
use crate::literal::Literal;
use crate::named_node::NamedNode;
use crate::{BlankNodeRef, LiteralRef, NamedNodeRef, TryFromTermError};
use crate::{BlankNodeRef, LiteralRef, NamedNodeRef};
use std::fmt;
/// The owned union of [IRIs](https://www.w3.org/TR/rdf11-concepts/#dfn-iri) and [blank nodes](https://www.w3.org/TR/rdf11-concepts/#dfn-blank-node).
@ -224,24 +223,6 @@ impl From<BlankNodeRef<'_>> for Subject {
}
}
impl TryFrom<Term> for Subject {
type Error = TryFromTermError;
#[inline]
fn try_from(term: Term) -> Result<Self, Self::Error> {
match term {
Term::NamedNode(node) => Ok(Subject::NamedNode(node)),
Term::BlankNode(node) => Ok(Subject::BlankNode(node)),
#[cfg(feature = "rdf-star")]
Term::Triple(triple) => Ok(Subject::Triple(triple)),
Term::Literal(_) => Err(TryFromTermError {
term,
target: "Subject",
}),
}
}
}
#[cfg(feature = "rdf-star")]
impl From<Triple> for Subject {
#[inline]
@ -553,6 +534,72 @@ impl From<SubjectRef<'_>> for Term {
}
}
impl TryFrom<Term> for NamedNode {
type Error = TryFromTermError;
#[inline]
fn try_from(term: Term) -> Result<Self, Self::Error> {
if let Term::NamedNode(node) = term {
Ok(node)
} else {
Err(TryFromTermError {
term,
target: "NamedNode",
})
}
}
}
impl TryFrom<Term> for BlankNode {
type Error = TryFromTermError;
#[inline]
fn try_from(term: Term) -> Result<Self, Self::Error> {
if let Term::BlankNode(node) = term {
Ok(node)
} else {
Err(TryFromTermError {
term,
target: "BlankNode",
})
}
}
}
impl TryFrom<Term> for Literal {
type Error = TryFromTermError;
#[inline]
fn try_from(term: Term) -> Result<Self, Self::Error> {
if let Term::Literal(node) = term {
Ok(node)
} else {
Err(TryFromTermError {
term,
target: "Literal",
})
}
}
}
impl TryFrom<Term> for Subject {
type Error = TryFromTermError;
#[inline]
fn try_from(term: Term) -> Result<Self, Self::Error> {
match term {
Term::NamedNode(term) => Ok(Self::NamedNode(term)),
Term::BlankNode(term) => Ok(Self::BlankNode(term)),
#[cfg(feature = "rdf-star")]
Term::Triple(term) => Ok(Self::Triple(term)),
Term::Literal(_) => Err(TryFromTermError {
term,
target: "Subject",
}),
}
}
}
/// A borrowed RDF [term](https://www.w3.org/TR/rdf11-concepts/#dfn-rdf-term)
/// It is the union of [IRIs](https://www.w3.org/TR/rdf11-concepts/#dfn-iri), [blank nodes](https://www.w3.org/TR/rdf11-concepts/#dfn-blank-node), [literals](https://www.w3.org/TR/rdf11-concepts/#dfn-literal) and [triples](https://www.w3.org/TR/rdf11-concepts/#dfn-rdf-triple) (if the `rdf-star` feature is enabled).
#[derive(Eq, PartialEq, Debug, Clone, Copy, Hash)]
@ -757,28 +804,20 @@ impl Triple {
}
}
/// Builds an RDF [triple](https://www.w3.org/TR/rdf11-concepts/#dfn-rdf-triple).
/// Builds an RDF [triple](https://www.w3.org/TR/rdf11-concepts/#dfn-rdf-triple) from [`Term`]s.
///
/// Returns a [`TryFromTermError`] error if the generated triple would be ill-formed.
#[inline]
pub fn new_from_terms(
pub fn from_terms(
subject: impl Into<Term>,
predicate: impl Into<Term>,
object: impl Into<Term>,
) -> Result<Self, TripleConstructionError> {
let subject: Result<Subject, TryFromTermError> = subject.into().try_into();
let predicate: Result<NamedNode, TryFromTermError> = predicate.into().try_into();
if let (Ok(subject), Ok(predicate)) = (subject.clone(), predicate.clone()) {
) -> Result<Self, TryFromTermError> {
Ok(Self {
subject,
predicate,
subject: subject.into().try_into()?,
predicate: predicate.into().try_into()?,
object: object.into(),
})
} else {
Err(TripleConstructionError {
subject,
predicate,
object: object.into(),
})
}
}
/// Encodes that this triple is in an [RDF dataset](https://www.w3.org/TR/rdf11-concepts/#dfn-rdf-dataset).
@ -809,23 +848,6 @@ impl fmt::Display for Triple {
}
}
#[cfg(feature = "rdf-star")]
impl TryFrom<Term> for Box<Triple> {
type Error = TryFromTermError;
#[inline]
fn try_from(term: Term) -> Result<Self, Self::Error> {
if let Term::Triple(node) = term {
Ok(node)
} else {
Err(TryFromTermError {
term,
target: "Box<Triple>",
})
}
}
}
/// A borrowed [RDF triple](https://www.w3.org/TR/rdf11-concepts/#dfn-rdf-triple).
///
/// The default string formatter is returning an N-Triples, Turtle, and SPARQL compatible representation:
@ -1285,7 +1307,22 @@ impl<'a> From<QuadRef<'a>> for Quad {
}
}
#[cfg(feature = "rdf-star")]
/// An error return by some [`TryFrom<Term>`](TryFrom) implementations.
#[derive(Debug, Clone, thiserror::Error)]
#[error("{term} can not be converted to a {target}")]
pub struct TryFromTermError {
pub(crate) term: Term,
pub(crate) target: &'static str,
}
impl TryFromTermError {
/// The term that can't be converted
#[inline]
pub fn into_term(self) -> Term {
self.term
}
}
#[cfg(test)]
mod tests {
#![allow(clippy::panic_in_result_fn)]
@ -1293,228 +1330,39 @@ mod tests {
use super::*;
#[test]
fn casting_triple() {
let triple = Triple {
subject: NamedNode::new("http://example.org/s").unwrap().into(),
predicate: NamedNode::new("http://example.org/p").unwrap(),
object: NamedNode::new("http://example.org/o").unwrap().into(),
};
let triple_box = Box::new(triple);
let t: Result<Box<Triple>, TryFromTermError> = Term::Triple(triple_box.clone()).try_into();
assert_eq!(t.unwrap(), triple_box.clone());
let literal: Result<Box<Triple>, TryFromTermError> =
Term::Literal(Literal::new_simple_literal("Hello World!")).try_into();
let literal_err = literal.unwrap_err();
assert_eq!(
literal_err.term,
Term::Literal(Literal::new_simple_literal("Hello World!"))
);
assert_eq!(literal_err.target, "Box<Triple>");
assert_eq!(
literal_err.to_string(),
"\"Hello World!\" can not be converted to a Box<Triple>"
);
assert_eq!(
Term::from(literal_err),
Term::Literal(Literal::new_simple_literal("Hello World!"))
);
let bnode: Result<Box<Triple>, TryFromTermError> =
Term::BlankNode(BlankNode::new_from_unique_id(0x42)).try_into();
let bnode_err = bnode.unwrap_err();
assert_eq!(
bnode_err.term,
Term::BlankNode(BlankNode::new_from_unique_id(0x42))
);
assert_eq!(bnode_err.target, "Box<Triple>");
assert_eq!(
bnode_err.to_string(),
"_:42 can not be converted to a Box<Triple>"
);
assert_eq!(
Term::from(bnode_err),
Term::BlankNode(BlankNode::new_from_unique_id(0x42))
);
let named_node: Result<Box<Triple>, TryFromTermError> =
Term::NamedNode(NamedNode::new("http://example.org/test").unwrap()).try_into();
let named_node_err = named_node.unwrap_err();
assert_eq!(
named_node_err.term,
Term::NamedNode(NamedNode::new("http://example.org/test").unwrap())
);
assert_eq!(named_node_err.target, "Box<Triple>");
assert_eq!(
named_node_err.to_string(),
"<http://example.org/test> can not be converted to a Box<Triple>"
);
fn triple_from_terms() -> Result<(), TryFromTermError> {
assert_eq!(
Term::from(named_node_err),
Term::NamedNode(NamedNode::new("http://example.org/test").unwrap())
);
}
#[test]
fn constructing_triple() {
use super::*;
let optional_triple = Triple::new_from_terms(
Term::NamedNode(NamedNode::new("http://example.org/test").unwrap()),
Term::NamedNode(NamedNode::new("http://example.org/test").unwrap()),
Term::NamedNode(NamedNode::new("http://example.org/test").unwrap()),
);
let optional_triple_2 = Triple::new_from_terms(
NamedNode::new("http://example.org/test").unwrap(),
NamedNode::new("http://example.org/test").unwrap(),
NamedNode::new("http://example.org/test").unwrap(),
);
let bad_triple: Result<Triple, TripleConstructionError> = Triple::new_from_terms(
Term::Literal(Literal::new_simple_literal("abc123")),
Term::NamedNode(NamedNode::new("http://example.org/test").unwrap()),
Term::NamedNode(NamedNode::new("http://example.org/test").unwrap()),
);
let bad_triple_2 = Triple::new_from_terms(
Term::Literal(Literal::new_simple_literal("abc123")),
NamedNode::new("http://example.org/test").unwrap(),
NamedNode::new("http://example.org/test").unwrap(),
);
let bad_triple_3 = Triple::new_from_terms(
Term::Literal(Literal::new_simple_literal("abc123")),
BlankNode::new_from_unique_id(0x42),
NamedNode::new("http://example.org/test").unwrap(),
);
let triple: Triple = Triple::new(
Subject::NamedNode(NamedNode::new("http://example.org/test").unwrap()),
NamedNode::new("http://example.org/test").unwrap(),
Term::NamedNode(NamedNode::new("http://example.org/test").unwrap()),
);
let triple_2: Triple = Triple::new(
NamedNode::new("http://example.org/test").unwrap(),
NamedNode::new("http://example.org/test").unwrap(),
NamedNode::new("http://example.org/test").unwrap(),
);
let unwrapped = optional_triple.unwrap();
assert_eq!(unwrapped, triple);
assert_eq!(unwrapped, triple_2.clone());
assert_eq!(optional_triple_2.unwrap(), triple_2);
let bad_triple_err = bad_triple.unwrap_err();
assert_eq!(
bad_triple_err.to_string(),
"subject: [\"abc123\" can not be converted to a Subject]"
);
assert_eq!(
bad_triple_err.subject.clone().unwrap_err().clone().term,
Term::Literal(Literal::new_simple_literal("abc123"))
);
assert_eq!(
bad_triple_err.subject.clone().unwrap_err().clone().target,
"Subject"
);
assert_eq!(
bad_triple_err.subject.unwrap_err().clone().to_string(),
"\"abc123\" can not be converted to a Subject"
);
assert_eq!(bad_triple_2.is_err(), true);
let bad_triple_2_err = bad_triple_2.unwrap_err();
assert_eq!(
bad_triple_2_err.to_string(),
"subject: [\"abc123\" can not be converted to a Subject]"
);
assert_eq!(
bad_triple_2_err.subject.clone().unwrap_err().clone().term,
Term::Literal(Literal::new_simple_literal("abc123"))
);
assert_eq!(
bad_triple_2_err.subject.clone().unwrap_err().clone().target,
"Subject"
);
assert_eq!(
bad_triple_2_err.subject.unwrap_err().clone().to_string(),
"\"abc123\" can not be converted to a Subject"
);
assert_eq!(
bad_triple_2_err.predicate.unwrap(),
NamedNode::new("http://example.org/test").unwrap()
);
assert_eq!(
bad_triple_2_err.object,
Term::NamedNode(NamedNode::new("http://example.org/test").unwrap())
);
assert_eq!(bad_triple_3.is_err(), true);
let bad_triple_3_err = bad_triple_3.unwrap_err();
assert_eq!(bad_triple_3_err.to_string(), "subject: [\"abc123\" can not be converted to a Subject], predicate: [_:42 can not be converted to a NamedNode]");
assert_eq!(
bad_triple_3_err.subject.clone().unwrap_err().clone().term,
Term::Literal(Literal::new_simple_literal("abc123"))
);
assert_eq!(
bad_triple_3_err.subject.clone().unwrap_err().clone().target,
"Subject"
);
assert_eq!(
bad_triple_3_err.subject.unwrap_err().clone().to_string(),
"\"abc123\" can not be converted to a Subject"
);
assert_eq!(
bad_triple_3_err.predicate.clone().unwrap_err().clone().term,
Term::BlankNode(BlankNode::new_from_unique_id(0x42))
Triple::from_terms(
NamedNode::new_unchecked("http://example.com/s"),
NamedNode::new_unchecked("http://example.com/p"),
NamedNode::new_unchecked("http://example.com/o"),
)?,
Triple::new(
NamedNode::new_unchecked("http://example.com/s"),
NamedNode::new_unchecked("http://example.com/p"),
NamedNode::new_unchecked("http://example.com/o"),
)
);
assert_eq!(
bad_triple_3_err
.predicate
.clone()
Triple::from_terms(
Literal::new_simple_literal("foo"),
NamedNode::new_unchecked("http://example.com/p"),
NamedNode::new_unchecked("http://example.com/o"),
)
.unwrap_err()
.clone()
.target,
"NamedNode"
.into_term(),
Term::from(Literal::new_simple_literal("foo"))
);
assert_eq!(
bad_triple_3_err.predicate.unwrap_err().clone().to_string(),
"_:42 can not be converted to a NamedNode"
);
}
#[test]
fn casting_subject() {
let triple = Triple {
subject: NamedNode::new("http://example.org/s").unwrap().into(),
predicate: NamedNode::new("http://example.org/p").unwrap(),
object: NamedNode::new("http://example.org/o").unwrap().into(),
};
let triple_box = Box::new(triple);
let t: Result<Subject, TryFromTermError> = Term::Triple(triple_box.clone()).try_into();
assert_eq!(t.unwrap(), Subject::Triple(triple_box.clone()));
let literal: Result<Subject, TryFromTermError> =
Term::Literal(Literal::new_simple_literal("Hello World!")).try_into();
assert_eq!(literal.is_err(), true);
assert_eq!(literal.is_err(), true);
let bnode: Result<Subject, TryFromTermError> =
Term::BlankNode(BlankNode::new_from_unique_id(0x42)).try_into();
assert_eq!(
bnode.unwrap(),
Subject::BlankNode(BlankNode::new_from_unique_id(0x42))
);
let named_node: Result<Subject, TryFromTermError> =
Term::NamedNode(NamedNode::new("http://example.org/test").unwrap()).try_into();
assert_eq!(
named_node.unwrap(),
Subject::NamedNode(NamedNode::new("http://example.org/test").unwrap())
Triple::from_terms(
NamedNode::new_unchecked("http://example.com/s"),
Literal::new_simple_literal("foo"),
NamedNode::new_unchecked("http://example.com/o"),
)
.unwrap_err()
.into_term(),
Term::from(Literal::new_simple_literal("foo"))
);
Ok(())
}
}

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