Function from_str_strict

src/parser.rs:189–220

Parse a flags value from text. This function will fail on any names that don't correspond to defined flags. This function will fail to parse hex values. */

(input: &str)

This function will fail to parse hex values.
*/
pub fn from_str_strict<B: Flags>(input: &str) -> Result<B, ParseError> {
    // This is a simplified version of `from_str` that ignores
    // any bits not corresponding to a named flag

    let mut parsed_flags = B::empty();

    // If the input is empty then return an empty set of flags
    if input.trim().is_empty() {
        return Ok(parsed_flags);
    }

    for flag in input.split('|') {
        let flag = flag.trim();

        // If the flag is empty then we've got missing input
        if flag.is_empty() {
            return Err(ParseError::empty_flag());
        }

        // If the flag starts with `0x` then it's a hex number
        // These aren't supported in the strict parser
        if flag.starts_with("0x") {
            return Err(ParseError::invalid_hex_flag("unsupported hex flag value"));
        }

        let parsed_flag = B::from_name(flag).ok_or_else(|| ParseError::invalid_named_flag(flag))?;

        parsed_flags.insert(parsed_flag);
    }

    Ok(parsed_flags)
}

/**
Encode a value as a hex string.