fn parse_nsamples(line: &mut &str, stripped_fractional_samples: &mut bool) -> Option<usize> {
    if let Some((samplesi, doti)) = rfind_samples(line) {
        let mut samples = &line[samplesi..];
        // Strip fractional part (if any);
        // foobar 1.klwdjlakdj
        //
        // The Perl version keeps the fractional part but this can be problematic
        // because of cumulative floating point errors. Instead we recommend to
        // use the --factor option. See https://github.com/brendangregg/FlameGraph/pull/18
        //
        // Warn if we're stripping a non-zero fractional part, but only the first time.
        if !*stripped_fractional_samples
            && doti < samples.len() - 1
            && !samples[doti + 1..].chars().all(|c| c == '0')
        {
            *stripped_fractional_samples = true;
            warn!(
                "The input data has fractional sample counts that will be truncated to integers. \
                 If you need to retain the extra precision you can scale up the sample data and \
                 use the --factor option to scale it back down."
            );
        }
        samples = &samples[..doti];
        let nsamples = samples.parse::<usize>().ok()?;
        // remove nsamples part we just parsed from line
        *line = line[..samplesi].trim_end();
        Some(nsamples)
    } else {
        None
    }
}
// Parse and remove the number of samples from the end of a line.
Parse and remove the number of samples from the end of a line.
Parse and remove the number of samples from the end of a line .
fn parse_nsamples(line: &mut &str, stripped_fractional_samples: &mut bool) -> Option<usize> {
    if let Some((samplesi, doti)) = rfind_samples(line) {
        let mut samples = &line[samplesi..];
        // Strip fractional part (if any);
        // foobar 1.klwdjlakdj
        //
        // The Perl version keeps the fractional part but this can be problematic
        // because of cumulative floating point errors. Instead we recommend to
        // use the --factor option. See https://github.com/brendangregg/FlameGraph/pull/18
        //
        // Warn if we're stripping a non-zero fractional part, but only the first time.
        if !*stripped_fractional_samples
            && doti < samples.len() - 1
            && !samples[doti + 1..].chars().all(|c| c == '0')
        {
            *stripped_fractional_samples = true;
            warn!(
                "The input data has fractional sample counts that will be truncated to integers. \
                 If you need to retain the extra precision you can scale up the sample data and \
                 use the --factor option to scale it back down."
            );
        }
        samples = &samples[..doti];
        let nsamples = samples.parse::<usize>().ok()?;
        // remove nsamples part we just parsed from line
        *line = line[..samplesi].trim_end();
        Some(nsamples)
    } else {
        None
    }
}
fn parse_nsamples ( line : & mut & str , stripped_fractional_samples : & mut bool ) -> Option < usize > { if let Some ( ( samplesi , doti ) ) = rfind_samples ( line ) { let mut samples = & line [ samplesi .. ] ; // Strip fractional part (if any); // foobar 1.klwdjlakdj // // The Perl version keeps the fractional part but this can be problematic // because of cumulative floating point errors. Instead we recommend to // use the --factor option. See https://github.com/brendangregg/FlameGraph/pull/18 // // Warn if we're stripping a non-zero fractional part, but only the first time. if ! * stripped_fractional_samples && doti < samples . len ( ) - 1 && ! samples [ doti + 1 .. ] . chars ( ) . all ( | c | c == '0' ) { * stripped_fractional_samples = true ; warn ! ( " \
 \
 " ) ; } samples = & samples [ .. doti ] ; let nsamples = samples . parse :: < usize > ( ) . ok ( ) ? ; // remove nsamples part we just parsed from line * line = line [ .. samplesi ] . trim_end ( ) ; Some ( nsamples ) } else { None } }
Parse and remove the number of samples from the end of a line.
Parse and remove the number of samples from the end of a line .
line
&mut &str
stripped_fractional_samples
&mut bool
line
&mut &str
stripped_fractional_samples
&mut bool