Fork of https://github.com/oxigraph/oxigraph.git for the purpose of NextGraph project
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
550 lines
20 KiB
550 lines
20 KiB
//! A [N-Quads](https://www.w3.org/TR/n-quads/) streaming parser implemented by [`NQuadsParser`].
|
|
|
|
use crate::line_formats::NQuadsRecognizer;
|
|
#[cfg(feature = "async-tokio")]
|
|
use crate::toolkit::FromTokioAsyncReadIterator;
|
|
use crate::toolkit::{FromReadIterator, ParseError, Parser, SyntaxError};
|
|
use oxrdf::{Quad, QuadRef};
|
|
use std::io::{self, Read, Write};
|
|
#[cfg(feature = "async-tokio")]
|
|
use tokio::io::{AsyncRead, AsyncWrite, AsyncWriteExt};
|
|
|
|
/// A [N-Quads](https://www.w3.org/TR/n-quads/) streaming parser.
|
|
///
|
|
/// Support for [N-Quads-star](https://w3c.github.io/rdf-star/cg-spec/2021-12-17.html#n-quads-star) is available behind the `rdf-star` feature and the [`NQuadsParser::with_quoted_triples`] option.
|
|
///
|
|
/// Count the number of people:
|
|
/// ```
|
|
/// use oxrdf::{NamedNodeRef, vocab::rdf};
|
|
/// use oxttl::NQuadsParser;
|
|
///
|
|
/// let file = b"<http://example.com/foo> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://schema.org/Person> .
|
|
/// <http://example.com/foo> <http://schema.org/name> \"Foo\" .
|
|
/// <http://example.com/bar> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://schema.org/Person> .
|
|
/// <http://example.com/bar> <http://schema.org/name> \"Bar\" .";
|
|
///
|
|
/// let schema_person = NamedNodeRef::new("http://schema.org/Person")?;
|
|
/// let mut count = 0;
|
|
/// for quad in NQuadsParser::new().parse_read(file.as_ref()) {
|
|
/// let quad = quad?;
|
|
/// if quad.predicate == rdf::TYPE && quad.object == schema_person.into() {
|
|
/// count += 1;
|
|
/// }
|
|
/// }
|
|
/// assert_eq!(2, count);
|
|
/// # Result::<_,Box<dyn std::error::Error>>::Ok(())
|
|
/// ```
|
|
#[derive(Default)]
|
|
#[must_use]
|
|
pub struct NQuadsParser {
|
|
#[cfg(feature = "rdf-star")]
|
|
with_quoted_triples: bool,
|
|
}
|
|
|
|
impl NQuadsParser {
|
|
/// Builds a new [`NQuadsParser`].
|
|
#[inline]
|
|
pub fn new() -> Self {
|
|
Self::default()
|
|
}
|
|
|
|
/// Enables [N-Quads-star](https://w3c.github.io/rdf-star/cg-spec/2021-12-17.html#n-quads-star).
|
|
#[cfg(feature = "rdf-star")]
|
|
#[inline]
|
|
pub fn with_quoted_triples(mut self) -> Self {
|
|
self.with_quoted_triples = true;
|
|
self
|
|
}
|
|
|
|
/// Parses a N-Quads file from a [`Read`] implementation.
|
|
///
|
|
/// Count the number of people:
|
|
/// ```
|
|
/// use oxrdf::{NamedNodeRef, vocab::rdf};
|
|
/// use oxttl::NQuadsParser;
|
|
///
|
|
/// let file = b"<http://example.com/foo> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://schema.org/Person> .
|
|
/// <http://example.com/foo> <http://schema.org/name> \"Foo\" .
|
|
/// <http://example.com/bar> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://schema.org/Person> .
|
|
/// <http://example.com/bar> <http://schema.org/name> \"Bar\" .";
|
|
///
|
|
/// let schema_person = NamedNodeRef::new("http://schema.org/Person")?;
|
|
/// let mut count = 0;
|
|
/// for quad in NQuadsParser::new().parse_read(file.as_ref()) {
|
|
/// let quad = quad?;
|
|
/// if quad.predicate == rdf::TYPE && quad.object == schema_person.into() {
|
|
/// count += 1;
|
|
/// }
|
|
/// }
|
|
/// assert_eq!(2, count);
|
|
/// # Result::<_,Box<dyn std::error::Error>>::Ok(())
|
|
/// ```
|
|
pub fn parse_read<R: Read>(self, read: R) -> FromReadNQuadsReader<R> {
|
|
FromReadNQuadsReader {
|
|
inner: self.parse().parser.parse_read(read),
|
|
}
|
|
}
|
|
|
|
/// Parses a N-Quads file from a [`AsyncRead`] implementation.
|
|
///
|
|
/// Count the number of people:
|
|
/// ```
|
|
/// use oxrdf::{NamedNodeRef, vocab::rdf};
|
|
/// use oxttl::NQuadsParser;
|
|
///
|
|
/// # #[tokio::main(flavor = "current_thread")]
|
|
/// # async fn main() -> Result<(), oxttl::ParseError> {
|
|
/// let file = b"<http://example.com/foo> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://schema.org/Person> .
|
|
/// <http://example.com/foo> <http://schema.org/name> \"Foo\" .
|
|
/// <http://example.com/bar> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://schema.org/Person> .
|
|
/// <http://example.com/bar> <http://schema.org/name> \"Bar\" .";
|
|
///
|
|
/// let schema_person = NamedNodeRef::new_unchecked("http://schema.org/Person");
|
|
/// let mut count = 0;
|
|
/// let mut parser = NQuadsParser::new().parse_tokio_async_read(file.as_ref());
|
|
/// while let Some(triple) = parser.next().await {
|
|
/// let triple = triple?;
|
|
/// if triple.predicate == rdf::TYPE && triple.object == schema_person.into() {
|
|
/// count += 1;
|
|
/// }
|
|
/// }
|
|
/// assert_eq!(2, count);
|
|
/// # Ok(())
|
|
/// # }
|
|
/// ```
|
|
#[cfg(feature = "async-tokio")]
|
|
pub fn parse_tokio_async_read<R: AsyncRead + Unpin>(
|
|
self,
|
|
read: R,
|
|
) -> FromTokioAsyncReadNQuadsReader<R> {
|
|
FromTokioAsyncReadNQuadsReader {
|
|
inner: self.parse().parser.parse_tokio_async_read(read),
|
|
}
|
|
}
|
|
|
|
/// Allows to parse a N-Quads file by using a low-level API.
|
|
///
|
|
/// Count the number of people:
|
|
/// ```
|
|
/// use oxrdf::{NamedNodeRef, vocab::rdf};
|
|
/// use oxttl::NQuadsParser;
|
|
///
|
|
/// let file: [&[u8]; 4] = [
|
|
/// b"<http://example.com/foo> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://schema.org/Person> .\n",
|
|
/// b"<http://example.com/foo> <http://schema.org/name> \"Foo\" .\n",
|
|
/// b"<http://example.com/bar> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://schema.org/Person> .\n",
|
|
/// b"<http://example.com/bar> <http://schema.org/name> \"Bar\" .\n"
|
|
/// ];
|
|
///
|
|
/// let schema_person = NamedNodeRef::new("http://schema.org/Person")?;
|
|
/// let mut count = 0;
|
|
/// let mut parser = NQuadsParser::new().parse();
|
|
/// let mut file_chunks = file.iter();
|
|
/// while !parser.is_end() {
|
|
/// // We feed more data to the parser
|
|
/// if let Some(chunk) = file_chunks.next() {
|
|
/// parser.extend_from_slice(chunk);
|
|
/// } else {
|
|
/// parser.end(); // It's finished
|
|
/// }
|
|
/// // We read as many quads from the parser as possible
|
|
/// while let Some(quad) = parser.read_next() {
|
|
/// let quad = quad?;
|
|
/// if quad.predicate == rdf::TYPE && quad.object == schema_person.into() {
|
|
/// count += 1;
|
|
/// }
|
|
/// }
|
|
/// }
|
|
/// assert_eq!(2, count);
|
|
/// # Result::<_,Box<dyn std::error::Error>>::Ok(())
|
|
/// ```
|
|
#[allow(clippy::unused_self)]
|
|
pub fn parse(self) -> LowLevelNQuadsReader {
|
|
LowLevelNQuadsReader {
|
|
parser: NQuadsRecognizer::new_parser(
|
|
true,
|
|
#[cfg(feature = "rdf-star")]
|
|
self.with_quoted_triples,
|
|
),
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Parses a N-Quads file from a [`Read`] implementation. Can be built using [`NQuadsParser::parse_read`].
|
|
///
|
|
/// Count the number of people:
|
|
/// ```
|
|
/// use oxrdf::{NamedNodeRef, vocab::rdf};
|
|
/// use oxttl::NQuadsParser;
|
|
///
|
|
/// let file = b"<http://example.com/foo> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://schema.org/Person> .
|
|
/// <http://example.com/foo> <http://schema.org/name> \"Foo\" .
|
|
/// <http://example.com/bar> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://schema.org/Person> .
|
|
/// <http://example.com/bar> <http://schema.org/name> \"Bar\" .";
|
|
///
|
|
/// let schema_person = NamedNodeRef::new("http://schema.org/Person")?;
|
|
/// let mut count = 0;
|
|
/// for quad in NQuadsParser::new().parse_read(file.as_ref()) {
|
|
/// let quad = quad?;
|
|
/// if quad.predicate == rdf::TYPE && quad.object == schema_person.into() {
|
|
/// count += 1;
|
|
/// }
|
|
/// }
|
|
/// assert_eq!(2, count);
|
|
/// # Result::<_,Box<dyn std::error::Error>>::Ok(())
|
|
/// ```
|
|
#[must_use]
|
|
pub struct FromReadNQuadsReader<R: Read> {
|
|
inner: FromReadIterator<R, NQuadsRecognizer>,
|
|
}
|
|
|
|
impl<R: Read> Iterator for FromReadNQuadsReader<R> {
|
|
type Item = Result<Quad, ParseError>;
|
|
|
|
fn next(&mut self) -> Option<Result<Quad, ParseError>> {
|
|
self.inner.next()
|
|
}
|
|
}
|
|
|
|
/// Parses a N-Quads file from a [`AsyncRead`] implementation. Can be built using [`NQuadsParser::parse_tokio_async_read`].
|
|
///
|
|
/// Count the number of people:
|
|
/// ```
|
|
/// use oxrdf::{NamedNodeRef, vocab::rdf};
|
|
/// use oxttl::NQuadsParser;
|
|
///
|
|
/// # #[tokio::main(flavor = "current_thread")]
|
|
/// # async fn main() -> Result<(), oxttl::ParseError> {
|
|
/// let file = b"<http://example.com/foo> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://schema.org/Person> .
|
|
/// <http://example.com/foo> <http://schema.org/name> \"Foo\" .
|
|
/// <http://example.com/bar> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://schema.org/Person> .
|
|
/// <http://example.com/bar> <http://schema.org/name> \"Bar\" .";
|
|
///
|
|
/// let schema_person = NamedNodeRef::new_unchecked("http://schema.org/Person");
|
|
/// let mut count = 0;
|
|
/// let mut parser = NQuadsParser::new().parse_tokio_async_read(file.as_ref());
|
|
/// while let Some(triple) = parser.next().await {
|
|
/// let triple = triple?;
|
|
/// if triple.predicate == rdf::TYPE && triple.object == schema_person.into() {
|
|
/// count += 1;
|
|
/// }
|
|
/// }
|
|
/// assert_eq!(2, count);
|
|
/// # Ok(())
|
|
/// # }
|
|
/// ```
|
|
#[cfg(feature = "async-tokio")]
|
|
#[must_use]
|
|
pub struct FromTokioAsyncReadNQuadsReader<R: AsyncRead + Unpin> {
|
|
inner: FromTokioAsyncReadIterator<R, NQuadsRecognizer>,
|
|
}
|
|
|
|
#[cfg(feature = "async-tokio")]
|
|
impl<R: AsyncRead + Unpin> FromTokioAsyncReadNQuadsReader<R> {
|
|
/// Reads the next triple or returns `None` if the file is finished.
|
|
pub async fn next(&mut self) -> Option<Result<Quad, ParseError>> {
|
|
Some(self.inner.next().await?.map(Into::into))
|
|
}
|
|
}
|
|
|
|
/// Parses a N-Quads file by using a low-level API. Can be built using [`NQuadsParser::parse`].
|
|
///
|
|
/// Count the number of people:
|
|
/// ```
|
|
/// use oxrdf::{NamedNodeRef, vocab::rdf};
|
|
/// use oxttl::NQuadsParser;
|
|
///
|
|
/// let file: [&[u8]; 4] = [
|
|
/// b"<http://example.com/foo> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://schema.org/Person> .\n",
|
|
/// b"<http://example.com/foo> <http://schema.org/name> \"Foo\" .\n",
|
|
/// b"<http://example.com/bar> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://schema.org/Person> .\n",
|
|
/// b"<http://example.com/bar> <http://schema.org/name> \"Bar\" .\n"
|
|
/// ];
|
|
///
|
|
/// let schema_person = NamedNodeRef::new("http://schema.org/Person")?;
|
|
/// let mut count = 0;
|
|
/// let mut parser = NQuadsParser::new().parse();
|
|
/// let mut file_chunks = file.iter();
|
|
/// while !parser.is_end() {
|
|
/// // We feed more data to the parser
|
|
/// if let Some(chunk) = file_chunks.next() {
|
|
/// parser.extend_from_slice(chunk);
|
|
/// } else {
|
|
/// parser.end(); // It's finished
|
|
/// }
|
|
/// // We read as many quads from the parser as possible
|
|
/// while let Some(quad) = parser.read_next() {
|
|
/// let quad = quad?;
|
|
/// if quad.predicate == rdf::TYPE && quad.object == schema_person.into() {
|
|
/// count += 1;
|
|
/// }
|
|
/// }
|
|
/// }
|
|
/// assert_eq!(2, count);
|
|
/// # Result::<_,Box<dyn std::error::Error>>::Ok(())
|
|
/// ```
|
|
pub struct LowLevelNQuadsReader {
|
|
parser: Parser<NQuadsRecognizer>,
|
|
}
|
|
|
|
impl LowLevelNQuadsReader {
|
|
/// Adds some extra bytes to the parser. Should be called when [`read_next`](Self::read_next) returns [`None`] and there is still unread data.
|
|
pub fn extend_from_slice(&mut self, other: &[u8]) {
|
|
self.parser.extend_from_slice(other)
|
|
}
|
|
|
|
/// Tell the parser that the file is finished.
|
|
///
|
|
/// This triggers the parsing of the final bytes and might lead [`read_next`](Self::read_next) to return some extra values.
|
|
pub fn end(&mut self) {
|
|
self.parser.end()
|
|
}
|
|
|
|
/// Returns if the parsing is finished i.e. [`end`](Self::end) has been called and [`read_next`](Self::read_next) is always going to return `None`.
|
|
pub fn is_end(&self) -> bool {
|
|
self.parser.is_end()
|
|
}
|
|
|
|
/// Attempt to parse a new quad from the already provided data.
|
|
///
|
|
/// Returns [`None`] if the parsing is finished or more data is required.
|
|
/// If it is the case more data should be fed using [`extend_from_slice`](Self::extend_from_slice).
|
|
pub fn read_next(&mut self) -> Option<Result<Quad, SyntaxError>> {
|
|
self.parser.read_next()
|
|
}
|
|
}
|
|
|
|
/// A [N-Quads](https://www.w3.org/TR/n-quads/) serializer.
|
|
///
|
|
/// Support for [N-Quads-star](https://w3c.github.io/rdf-star/cg-spec/2021-12-17.html#n-quads-star) is available behind the `rdf-star` feature.
|
|
///
|
|
/// ```
|
|
/// use oxrdf::{NamedNodeRef, QuadRef};
|
|
/// use oxttl::NQuadsSerializer;
|
|
///
|
|
/// let mut writer = NQuadsSerializer::new().serialize_to_write(Vec::new());
|
|
/// writer.write_quad(QuadRef::new(
|
|
/// NamedNodeRef::new("http://example.com#me")?,
|
|
/// NamedNodeRef::new("http://www.w3.org/1999/02/22-rdf-syntax-ns#type")?,
|
|
/// NamedNodeRef::new("http://schema.org/Person")?,
|
|
/// NamedNodeRef::new("http://example.com")?,
|
|
/// ))?;
|
|
/// assert_eq!(
|
|
/// b"<http://example.com#me> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://schema.org/Person> <http://example.com> .\n",
|
|
/// writer.finish().as_slice()
|
|
/// );
|
|
/// # Result::<_,Box<dyn std::error::Error>>::Ok(())
|
|
/// ```
|
|
#[derive(Default)]
|
|
#[must_use]
|
|
pub struct NQuadsSerializer;
|
|
|
|
impl NQuadsSerializer {
|
|
/// Builds a new [`NQuadsSerializer`].
|
|
#[inline]
|
|
pub fn new() -> Self {
|
|
Self
|
|
}
|
|
|
|
/// Writes a N-Quads file to a [`Write`] implementation.
|
|
///
|
|
/// ```
|
|
/// use oxrdf::{NamedNodeRef, QuadRef};
|
|
/// use oxttl::NQuadsSerializer;
|
|
///
|
|
/// let mut writer = NQuadsSerializer::new().serialize_to_write(Vec::new());
|
|
/// writer.write_quad(QuadRef::new(
|
|
/// NamedNodeRef::new("http://example.com#me")?,
|
|
/// NamedNodeRef::new("http://www.w3.org/1999/02/22-rdf-syntax-ns#type")?,
|
|
/// NamedNodeRef::new("http://schema.org/Person")?,
|
|
/// NamedNodeRef::new("http://example.com")?,
|
|
/// ))?;
|
|
/// assert_eq!(
|
|
/// b"<http://example.com#me> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://schema.org/Person> <http://example.com> .\n",
|
|
/// writer.finish().as_slice()
|
|
/// );
|
|
/// # Result::<_,Box<dyn std::error::Error>>::Ok(())
|
|
/// ```
|
|
pub fn serialize_to_write<W: Write>(self, write: W) -> ToWriteNQuadsWriter<W> {
|
|
ToWriteNQuadsWriter {
|
|
write,
|
|
writer: self.serialize(),
|
|
}
|
|
}
|
|
|
|
/// Writes a N-Quads file to a [`AsyncWrite`] implementation.
|
|
///
|
|
/// ```
|
|
/// use oxrdf::{NamedNodeRef, QuadRef};
|
|
/// use oxttl::NQuadsSerializer;
|
|
///
|
|
/// # #[tokio::main(flavor = "current_thread")]
|
|
/// # async fn main() -> std::io::Result<()> {
|
|
/// let mut writer = NQuadsSerializer::new().serialize_to_tokio_async_write(Vec::new());
|
|
/// writer.write_quad(QuadRef::new(
|
|
/// NamedNodeRef::new_unchecked("http://example.com#me"),
|
|
/// NamedNodeRef::new_unchecked("http://www.w3.org/1999/02/22-rdf-syntax-ns#type"),
|
|
/// NamedNodeRef::new_unchecked("http://schema.org/Person"),
|
|
/// NamedNodeRef::new_unchecked("http://example.com"),
|
|
/// )).await?;
|
|
/// assert_eq!(
|
|
/// b"<http://example.com#me> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://schema.org/Person> <http://example.com> .\n",
|
|
/// writer.finish().as_slice()
|
|
/// );
|
|
/// # Ok(())
|
|
/// # }
|
|
/// ```
|
|
#[cfg(feature = "async-tokio")]
|
|
pub fn serialize_to_tokio_async_write<W: AsyncWrite + Unpin>(
|
|
self,
|
|
write: W,
|
|
) -> ToTokioAsyncWriteNQuadsWriter<W> {
|
|
ToTokioAsyncWriteNQuadsWriter {
|
|
write,
|
|
writer: self.serialize(),
|
|
buffer: Vec::new(),
|
|
}
|
|
}
|
|
|
|
/// Builds a low-level N-Quads writer.
|
|
///
|
|
/// ```
|
|
/// use oxrdf::{NamedNodeRef, QuadRef};
|
|
/// use oxttl::NQuadsSerializer;
|
|
///
|
|
/// let mut buf = Vec::new();
|
|
/// let mut writer = NQuadsSerializer::new().serialize();
|
|
/// writer.write_quad(QuadRef::new(
|
|
/// NamedNodeRef::new("http://example.com#me")?,
|
|
/// NamedNodeRef::new("http://www.w3.org/1999/02/22-rdf-syntax-ns#type")?,
|
|
/// NamedNodeRef::new("http://schema.org/Person")?,
|
|
/// NamedNodeRef::new("http://example.com")?,
|
|
/// ), &mut buf)?;
|
|
/// assert_eq!(
|
|
/// b"<http://example.com#me> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://schema.org/Person> <http://example.com> .\n",
|
|
/// buf.as_slice()
|
|
/// );
|
|
/// # Result::<_,Box<dyn std::error::Error>>::Ok(())
|
|
/// ```
|
|
#[allow(clippy::unused_self)]
|
|
pub fn serialize(&self) -> LowLevelNQuadsWriter {
|
|
LowLevelNQuadsWriter
|
|
}
|
|
}
|
|
|
|
/// Writes a N-Quads file to a [`Write`] implementation. Can be built using [`NQuadsSerializer::serialize_to_write`].
|
|
///
|
|
/// ```
|
|
/// use oxrdf::{NamedNodeRef, QuadRef};
|
|
/// use oxttl::NQuadsSerializer;
|
|
///
|
|
/// let mut writer = NQuadsSerializer::new().serialize_to_write(Vec::new());
|
|
/// writer.write_quad(QuadRef::new(
|
|
/// NamedNodeRef::new("http://example.com#me")?,
|
|
/// NamedNodeRef::new("http://www.w3.org/1999/02/22-rdf-syntax-ns#type")?,
|
|
/// NamedNodeRef::new("http://schema.org/Person")?,
|
|
/// NamedNodeRef::new("http://example.com")?,
|
|
/// ))?;
|
|
/// assert_eq!(
|
|
/// b"<http://example.com#me> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://schema.org/Person> <http://example.com> .\n",
|
|
/// writer.finish().as_slice()
|
|
/// );
|
|
/// # Result::<_,Box<dyn std::error::Error>>::Ok(())
|
|
/// ```
|
|
#[must_use]
|
|
pub struct ToWriteNQuadsWriter<W: Write> {
|
|
write: W,
|
|
writer: LowLevelNQuadsWriter,
|
|
}
|
|
|
|
impl<W: Write> ToWriteNQuadsWriter<W> {
|
|
/// Writes an extra quad.
|
|
pub fn write_quad<'a>(&mut self, q: impl Into<QuadRef<'a>>) -> io::Result<()> {
|
|
self.writer.write_quad(q, &mut self.write)
|
|
}
|
|
|
|
/// Ends the write process and returns the underlying [`Write`].
|
|
pub fn finish(self) -> W {
|
|
self.write
|
|
}
|
|
}
|
|
|
|
/// Writes a N-Quads file to a [`AsyncWrite`] implementation. Can be built using [`NQuadsSerializer::serialize_to_tokio_async_write`].
|
|
///
|
|
/// ```
|
|
/// use oxrdf::{NamedNodeRef, QuadRef};
|
|
/// use oxttl::NQuadsSerializer;
|
|
///
|
|
/// # #[tokio::main(flavor = "current_thread")]
|
|
/// # async fn main() -> std::io::Result<()> {
|
|
/// let mut writer = NQuadsSerializer::new().serialize_to_tokio_async_write(Vec::new());
|
|
/// writer.write_quad(QuadRef::new(
|
|
/// NamedNodeRef::new_unchecked("http://example.com#me"),
|
|
/// NamedNodeRef::new_unchecked("http://www.w3.org/1999/02/22-rdf-syntax-ns#type"),
|
|
/// NamedNodeRef::new_unchecked("http://schema.org/Person"),
|
|
/// NamedNodeRef::new_unchecked("http://example.com"),
|
|
/// )).await?;
|
|
/// assert_eq!(
|
|
/// b"<http://example.com#me> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://schema.org/Person> <http://example.com> .\n",
|
|
/// writer.finish().as_slice()
|
|
/// );
|
|
/// # Ok(())
|
|
/// # }
|
|
/// ```
|
|
#[cfg(feature = "async-tokio")]
|
|
#[must_use]
|
|
pub struct ToTokioAsyncWriteNQuadsWriter<W: AsyncWrite + Unpin> {
|
|
write: W,
|
|
writer: LowLevelNQuadsWriter,
|
|
buffer: Vec<u8>,
|
|
}
|
|
|
|
#[cfg(feature = "async-tokio")]
|
|
impl<W: AsyncWrite + Unpin> ToTokioAsyncWriteNQuadsWriter<W> {
|
|
/// Writes an extra quad.
|
|
pub async fn write_quad<'a>(&mut self, q: impl Into<QuadRef<'a>>) -> io::Result<()> {
|
|
self.writer.write_quad(q, &mut self.buffer)?;
|
|
self.write.write_all(&self.buffer).await?;
|
|
self.buffer.clear();
|
|
Ok(())
|
|
}
|
|
|
|
/// Ends the write process and returns the underlying [`Write`].
|
|
pub fn finish(self) -> W {
|
|
self.write
|
|
}
|
|
}
|
|
|
|
/// Writes a N-Quads file by using a low-level API. Can be built using [`NQuadsSerializer::serialize`].
|
|
///
|
|
/// ```
|
|
/// use oxrdf::{NamedNodeRef, QuadRef};
|
|
/// use oxttl::NQuadsSerializer;
|
|
///
|
|
/// let mut buf = Vec::new();
|
|
/// let mut writer = NQuadsSerializer::new().serialize();
|
|
/// writer.write_quad(QuadRef::new(
|
|
/// NamedNodeRef::new("http://example.com#me")?,
|
|
/// NamedNodeRef::new("http://www.w3.org/1999/02/22-rdf-syntax-ns#type")?,
|
|
/// NamedNodeRef::new("http://schema.org/Person")?,
|
|
/// NamedNodeRef::new("http://example.com")?,
|
|
/// ), &mut buf)?;
|
|
/// assert_eq!(
|
|
/// b"<http://example.com#me> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://schema.org/Person> <http://example.com> .\n",
|
|
/// buf.as_slice()
|
|
/// );
|
|
/// # Result::<_,Box<dyn std::error::Error>>::Ok(())
|
|
/// ```
|
|
pub struct LowLevelNQuadsWriter;
|
|
|
|
impl LowLevelNQuadsWriter {
|
|
/// Writes an extra quad.
|
|
#[allow(clippy::unused_self)]
|
|
pub fn write_quad<'a>(
|
|
&mut self,
|
|
q: impl Into<QuadRef<'a>>,
|
|
mut write: impl Write,
|
|
) -> io::Result<()> {
|
|
writeln!(write, "{} .", q.into())
|
|
}
|
|
}
|
|
|