Function to_writer

src/parser.rs:42–78

Write a flags value as text. Any bits that aren't part of a contained flag will be formatted as a hex number. */

(flags: &B, mut writer: impl Write)

Any bits that aren't part of a contained flag will be formatted as a hex number.
*/
pub fn to_writer<B: Flags>(flags: &B, mut writer: impl Write) -> Result<(), fmt::Error>
where
    B::Bits: WriteHex,
{
    // A formatter for bitflags that produces text output like:
    //
    // A | B | 0xf6
    //
    // The names of set flags are written in a bar-separated-format,
    // followed by a hex number of any remaining bits that are set
    // but don't correspond to any flags.

    // Iterate over known flag values
    let mut first = true;
    let mut iter = flags.iter_names();
    for (name, _) in &mut iter {
        if !first {
            writer.write_str(" | ")?;
        }

        first = false;
        writer.write_str(name)?;
    }

    // Append any extra bits that correspond to flags to the end of the format
    let remaining = iter.remaining().bits();
    if remaining != B::Bits::EMPTY {
        if !first {
            writer.write_str(" | ")?;
        }

        writer.write_str("0x")?;
        remaining.write_hex(writer)?;
    }

    fmt::Result::Ok(())
}

#[cfg(feature = "serde")]
pub(crate) struct AsDisplay<'a, B>(pub(crate) &'a B);