[−][src]Macro combine::decode_futures_03
Parses an instance of futures::io::AsyncRead
as a &[u8]
without reading the entire file into
memory.
This is defined as a macro to work around the lack of Higher Ranked Types. See the
example for how to pass a parser to the macro (constructing parts of the parser outside of
the decode!
call is unlikely to work.
use futures::pin_mut; use async_std::{ fs::File, task, }; use combine::{decode_futures_03, satisfy, skip_many1, many1, sep_end_by, Parser, stream::Decoder}; fn main() { task::block_on(main_()); } async fn main_() { let mut read = File::open("README.md").await.unwrap(); let mut decoder = Decoder::new(); let is_whitespace = |b: u8| b == b' ' || b == b'\r' || b == b'\n'; assert_eq!( decode_futures_03!( decoder, &mut read, { let word = many1(satisfy(|b| !is_whitespace(b))); sep_end_by(word, skip_many1(satisfy(is_whitespace))).map(|words: Vec<Vec<u8>>| words.len()) }, |input, _position| combine::easy::Stream::from(input), ).map_err(combine::easy::Errors::<u8, &[u8], _>::from), Ok(819), ); }