mirror of
https://github.com/rust-lang/rust-analyzer
synced 2025-01-01 07:48:45 +00:00
35 lines
827 B
Rust
35 lines
827 B
Rust
//! Protocol functions for json.
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use std::io::{self, BufRead, Write};
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pub fn read_json<'a>(
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inp: &mut impl BufRead,
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buf: &'a mut String,
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) -> io::Result<Option<&'a String>> {
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loop {
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buf.clear();
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inp.read_line(buf)?;
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buf.pop(); // Remove trailing '\n'
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if buf.is_empty() {
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return Ok(None);
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}
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// Some ill behaved macro try to use stdout for debugging
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// We ignore it here
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if !buf.starts_with('{') {
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tracing::error!("proc-macro tried to print : {}", buf);
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continue;
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}
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return Ok(Some(buf));
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}
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}
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pub fn write_json(out: &mut impl Write, msg: &str) -> io::Result<()> {
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tracing::debug!("> {}", msg);
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out.write_all(msg.as_bytes())?;
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out.write_all(b"\n")?;
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out.flush()?;
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Ok(())
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}
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