Struct serde_json::StreamDeserializer
source · pub struct StreamDeserializer<'de, R, T> { /* private fields */ }
Expand description
Iterator that deserializes a stream into multiple JSON values.
A stream deserializer can be created from any JSON deserializer using the
Deserializer::into_iter
method.
The data can consist of any JSON value. Values need to be a self-delineating value e.g. arrays, objects, or strings, or be followed by whitespace or a self-delineating value.
use serde_json::{Deserializer, Value};
fn main() {
let data = "{\"k\": 3}1\"cool\"\"stuff\" 3{} [0, 1, 2]";
let stream = Deserializer::from_str(data).into_iter::<Value>();
for value in stream {
println!("{}", value.unwrap());
}
}
Implementations§
source§impl<'de, R, T> StreamDeserializer<'de, R, T>where
R: Read<'de>,
T: Deserialize<'de>,
impl<'de, R, T> StreamDeserializer<'de, R, T>where
R: Read<'de>,
T: Deserialize<'de>,
sourcepub fn new(read: R) -> Self
pub fn new(read: R) -> Self
Create a JSON stream deserializer from one of the possible serde_json input sources.
Typically it is more convenient to use one of these methods instead:
- Deserializer::from_str(…).into_iter()
- Deserializer::from_slice(…).into_iter()
- Deserializer::from_reader(…).into_iter()
sourcepub fn byte_offset(&self) -> usize
pub fn byte_offset(&self) -> usize
Returns the number of bytes so far deserialized into a successful T
.
If a stream deserializer returns an EOF error, new data can be joined to
old_data[stream.byte_offset()..]
to try again.
let data = b"[0] [1] [";
let de = serde_json::Deserializer::from_slice(data);
let mut stream = de.into_iter::<Vec<i32>>();
assert_eq!(0, stream.byte_offset());
println!("{:?}", stream.next()); // [0]
assert_eq!(3, stream.byte_offset());
println!("{:?}", stream.next()); // [1]
assert_eq!(7, stream.byte_offset());
println!("{:?}", stream.next()); // error
assert_eq!(8, stream.byte_offset());
// If err.is_eof(), can join the remaining data to new data and continue.
let remaining = &data[stream.byte_offset()..];
Note: In the future this method may be changed to return the number of bytes so far deserialized into a successful T or syntactically valid JSON skipped over due to a type error. See serde-rs/json#70 for an example illustrating this.
Trait Implementations§
source§impl<'de, R, T> Iterator for StreamDeserializer<'de, R, T>where
R: Read<'de>,
T: Deserialize<'de>,
impl<'de, R, T> Iterator for StreamDeserializer<'de, R, T>where
R: Read<'de>,
T: Deserialize<'de>,
source§fn next(&mut self) -> Option<Result<T>>
fn next(&mut self) -> Option<Result<T>>
source§fn next_chunk<const N: usize>(
&mut self,
) -> Result<[Self::Item; N], IntoIter<Self::Item, N>>where
Self: Sized,
fn next_chunk<const N: usize>(
&mut self,
) -> Result<[Self::Item; N], IntoIter<Self::Item, N>>where
Self: Sized,
iter_next_chunk
)N
values. Read more1.0.0 · source§fn size_hint(&self) -> (usize, Option<usize>)
fn size_hint(&self) -> (usize, Option<usize>)
1.0.0 · source§fn count(self) -> usizewhere
Self: Sized,
fn count(self) -> usizewhere
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1.0.0 · source§fn last(self) -> Option<Self::Item>where
Self: Sized,
fn last(self) -> Option<Self::Item>where
Self: Sized,
source§fn advance_by(&mut self, n: usize) -> Result<(), NonZero<usize>>
fn advance_by(&mut self, n: usize) -> Result<(), NonZero<usize>>
iter_advance_by
)n
elements. Read more1.0.0 · source§fn nth(&mut self, n: usize) -> Option<Self::Item>
fn nth(&mut self, n: usize) -> Option<Self::Item>
n
th element of the iterator. Read more1.28.0 · source§fn step_by(self, step: usize) -> StepBy<Self>where
Self: Sized,
fn step_by(self, step: usize) -> StepBy<Self>where
Self: Sized,
1.0.0 · source§fn chain<U>(self, other: U) -> Chain<Self, <U as IntoIterator>::IntoIter>
fn chain<U>(self, other: U) -> Chain<Self, <U as IntoIterator>::IntoIter>
1.0.0 · source§fn zip<U>(self, other: U) -> Zip<Self, <U as IntoIterator>::IntoIter>where
Self: Sized,
U: IntoIterator,
fn zip<U>(self, other: U) -> Zip<Self, <U as IntoIterator>::IntoIter>where
Self: Sized,
U: IntoIterator,
source§fn intersperse_with<G>(self, separator: G) -> IntersperseWith<Self, G>
fn intersperse_with<G>(self, separator: G) -> IntersperseWith<Self, G>
iter_intersperse
)separator
between adjacent items of the original iterator. Read more1.0.0 · source§fn map<B, F>(self, f: F) -> Map<Self, F>
fn map<B, F>(self, f: F) -> Map<Self, F>
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fn filter<P>(self, predicate: P) -> Filter<Self, P>
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Self: Sized,
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fn skip_while<P>(self, predicate: P) -> SkipWhile<Self, P>
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fn take_while<P>(self, predicate: P) -> TakeWhile<Self, P>
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fn map_while<B, P>(self, predicate: P) -> MapWhile<Self, P>
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Self: Sized,
fn skip(self, n: usize) -> Skip<Self>where
Self: Sized,
n
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Self: Sized,
fn take(self, n: usize) -> Take<Self>where
Self: Sized,
n
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fn flat_map<U, F>(self, f: F) -> FlatMap<Self, U, F>
source§fn map_windows<F, R, const N: usize>(self, f: F) -> MapWindows<Self, F, N>
fn map_windows<F, R, const N: usize>(self, f: F) -> MapWindows<Self, F, N>
iter_map_windows
)f
for each contiguous window of size N
over
self
and returns an iterator over the outputs of f
. Like slice::windows()
,
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fn inspect<F>(self, f: F) -> Inspect<Self, F>
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Self: Sized,
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iter_collect_into
)1.0.0 · source§fn partition<B, F>(self, f: F) -> (B, B)
fn partition<B, F>(self, f: F) -> (B, B)
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fn is_partitioned<P>(self, predicate: P) -> bool
iter_is_partitioned
)true
precede all those that return false
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fn reduce<F>(self, f: F) -> Option<Self::Item>
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&mut self,
f: impl FnMut(Self::Item, Self::Item) -> R,
) -> <<R as Try>::Residual as Residual<Option<<R as Try>::Output>>>::TryType
fn try_reduce<R>( &mut self, f: impl FnMut(Self::Item, Self::Item) -> R, ) -> <<R as Try>::Residual as Residual<Option<<R as Try>::Output>>>::TryType
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)1.0.0 · source§fn all<F>(&mut self, f: F) -> bool
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fn any<F>(&mut self, f: F) -> bool
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fn find_map<B, F>(&mut self, f: F) -> Option<B>
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&mut self,
f: impl FnMut(&Self::Item) -> R,
) -> <<R as Try>::Residual as Residual<Option<Self::Item>>>::TryType
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)1.0.0 · source§fn position<P>(&mut self, predicate: P) -> Option<usize>
fn position<P>(&mut self, predicate: P) -> Option<usize>
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fn max_by_key<B, F>(self, f: F) -> Option<Self::Item>
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fn max_by<F>(self, compare: F) -> Option<Self::Item>
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fn min_by_key<B, F>(self, f: F) -> Option<Self::Item>
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fn min_by<F>(self, compare: F) -> Option<Self::Item>
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fn unzip<A, B, FromA, FromB>(self) -> (FromA, FromB)
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fn copied<'a, T>(self) -> Copied<Self>
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Self: Sized,
fn array_chunks<const N: usize>(self) -> ArrayChunks<Self, N>where
Self: Sized,
iter_array_chunks
)N
elements of the iterator at a time. Read more1.11.0 · source§fn product<P>(self) -> P
fn product<P>(self) -> P
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)Iterator
with those
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fn partial_cmp<I>(self, other: I) -> Option<Ordering>
PartialOrd
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this Iterator
with those of another. The comparison works like short-circuit
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Self: Sized,
I: IntoIterator,
F: FnMut(Self::Item, <I as IntoIterator>::Item) -> Option<Ordering>,
fn partial_cmp_by<I, F>(self, other: I, partial_cmp: F) -> Option<Ordering>where
Self: Sized,
I: IntoIterator,
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)Iterator
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)1.5.0 · source§fn lt<I>(self, other: I) -> bool
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Iterator
are lexicographically
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)source§fn is_sorted_by_key<F, K>(self, f: F) -> bool
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is_sorted
)