fn from_str()

in sdk/core/azure_core/src/http/request/options/content_range.rs [45:121]
69 lines of code
13 McCabe index (conditional complexity)

    fn from_str(s: &str) -> crate::Result<ContentRange> {
        let remaining = s.strip_prefix(PREFIX).ok_or_else(|| {
            Error::with_message(ErrorKind::Other, || {
                format!(
                    "expected token \"{PREFIX}\" not found when parsing ContentRange from \"{s}\""
                )
            })
        })?;

        // when requesting zero byte files from azurite, it can generate invalid content-range
        // headers.  See Azure/Azurite#1682 for more information.
        if cfg!(feature = "azurite_workaround") && remaining == "0--1/0" {
            return Ok(ContentRange {
                start: 0,
                end: 0,
                total_length: 0,
            });
        }

        let mut split_at_dash = remaining.split('-');
        let start = split_at_dash
            .next()
            .ok_or_else(|| {
                Error::with_message(ErrorKind::Other, || {
                    format!(
                        "expected token \"{}\" not found when parsing ContentRange from \"{}\"",
                        "-", s
                    )
                })
            })?
            .parse()
            .map_kind(ErrorKind::DataConversion)?;

        let mut split_at_slash = split_at_dash
            .next()
            .ok_or_else(|| {
                Error::with_message(ErrorKind::Other, || {
                    format!(
                        "expected token \"{}\" not found when parsing ContentRange from \"{}\"",
                        "-", s
                    )
                })
            })?
            .split('/');

        let end = split_at_slash
            .next()
            .ok_or_else(|| {
                Error::with_message(ErrorKind::Other, || {
                    format!(
                        "expected token \"{}\" not found when parsing ContentRange from \"{}\"",
                        "/", s
                    )
                })
            })?
            .parse()
            .map_kind(ErrorKind::DataConversion)?;

        let total_length = split_at_slash
            .next()
            .ok_or_else(|| {
                Error::with_message(ErrorKind::Other, || {
                    format!(
                        "expected token \"{}\" not found when parsing ContentRange from \"{}\"",
                        "/", s
                    )
                })
            })?
            .parse()
            .map_kind(ErrorKind::DataConversion)?;

        Ok(ContentRange {
            start,
            end,
            total_length,
        })
    }