nushell/src/stream.rs

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4.5 KiB
Rust
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use crate::prelude::*;
pub struct InputStream {
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crate values: BoxStream<'static, Tagged<Value>>,
}
impl InputStream {
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pub fn into_vec(self) -> impl Future<Output = Vec<Tagged<Value>>> {
self.values.collect()
}
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pub fn drain_vec(&mut self) -> impl Future<Output = Vec<Tagged<Value>>> {
let mut values: BoxStream<'static, Tagged<Value>> = VecDeque::new().boxed();
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std::mem::swap(&mut values, &mut self.values);
values.collect()
}
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pub fn from_stream(input: impl Stream<Item = Tagged<Value>> + Send + 'static) -> InputStream {
InputStream {
values: input.boxed(),
}
}
}
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impl From<BoxStream<'static, Tagged<Value>>> for InputStream {
fn from(input: BoxStream<'static, Tagged<Value>>) -> InputStream {
InputStream { values: input }
}
}
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impl From<VecDeque<Tagged<Value>>> for InputStream {
fn from(input: VecDeque<Tagged<Value>>) -> InputStream {
InputStream {
values: input.boxed(),
}
}
}
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impl From<Vec<Tagged<Value>>> for InputStream {
fn from(input: Vec<Tagged<Value>>) -> InputStream {
let mut list = VecDeque::default();
list.extend(input);
InputStream {
values: list.boxed(),
}
}
}
pub struct OutputStream {
crate values: BoxStream<'static, ReturnValue>,
}
impl OutputStream {
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pub fn new(values: impl Stream<Item = ReturnValue> + Send + 'static) -> OutputStream {
OutputStream {
values: values.boxed(),
}
}
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pub fn empty() -> OutputStream {
let v: VecDeque<ReturnValue> = VecDeque::new();
v.into()
}
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pub fn one(item: impl Into<ReturnValue>) -> OutputStream {
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let mut v: VecDeque<ReturnValue> = VecDeque::new();
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v.push_back(item.into());
v.into()
}
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pub fn from_input(input: impl Stream<Item = Tagged<Value>> + Send + 'static) -> OutputStream {
OutputStream {
values: input.map(ReturnSuccess::value).boxed(),
}
}
pub fn drain_vec(&mut self) -> impl Future<Output = Vec<ReturnValue>> {
let mut values: BoxStream<'static, ReturnValue> = VecDeque::new().boxed();
std::mem::swap(&mut values, &mut self.values);
values.collect()
}
}
impl std::ops::Try for OutputStream {
type Ok = OutputStream;
type Error = ShellError;
fn into_result(self) -> Result<Self::Ok, Self::Error> {
Ok(self)
}
fn from_error(v: Self::Error) -> Self {
OutputStream::one(Err(v))
}
fn from_ok(v: Self::Ok) -> Self {
v
}
}
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impl Stream for OutputStream {
type Item = ReturnValue;
fn poll_next(
mut self: std::pin::Pin<&mut Self>,
cx: &mut std::task::Context<'_>,
) -> core::task::Poll<Option<Self::Item>> {
Stream::poll_next(std::pin::Pin::new(&mut self.values), cx)
}
}
impl From<InputStream> for OutputStream {
fn from(input: InputStream) -> OutputStream {
OutputStream {
values: input.values.map(ReturnSuccess::value).boxed(),
}
}
}
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impl From<BoxStream<'static, Tagged<Value>>> for OutputStream {
fn from(input: BoxStream<'static, Tagged<Value>>) -> OutputStream {
OutputStream {
values: input.map(ReturnSuccess::value).boxed(),
}
}
}
impl From<BoxStream<'static, ReturnValue>> for OutputStream {
fn from(input: BoxStream<'static, ReturnValue>) -> OutputStream {
OutputStream { values: input }
}
}
impl From<VecDeque<ReturnValue>> for OutputStream {
fn from(input: VecDeque<ReturnValue>) -> OutputStream {
OutputStream {
values: input.boxed(),
}
}
}
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impl From<VecDeque<Tagged<Value>>> for OutputStream {
fn from(input: VecDeque<Tagged<Value>>) -> OutputStream {
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OutputStream {
values: input
.into_iter()
.map(|i| ReturnSuccess::value(i))
.collect::<VecDeque<ReturnValue>>()
.boxed(),
}
}
}
impl From<Vec<ReturnValue>> for OutputStream {
fn from(input: Vec<ReturnValue>) -> OutputStream {
let mut list = VecDeque::default();
list.extend(input);
OutputStream {
values: list.boxed(),
}
}
}
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impl From<Vec<Tagged<Value>>> for OutputStream {
fn from(input: Vec<Tagged<Value>>) -> OutputStream {
let mut list = VecDeque::default();
list.extend(input.into_iter().map(ReturnSuccess::value));
OutputStream {
values: list.boxed(),
}
}
}