fn attrs_from_sgr_parameters()

in crates/alacritty_terminal/src/ansi.rs [1504:1591]
84 lines of code
4 McCabe index (conditional complexity)

fn attrs_from_sgr_parameters(params: &mut ParamsIter<'_>) -> Vec<Option<Attr>> {
    let mut attrs = Vec::with_capacity(params.size_hint().0);

    while let Some(param) = params.next() {
        let attr = match param {
            [0] => Some(Attr::Reset),
            [1] => Some(Attr::Bold),
            [2] => Some(Attr::Dim),
            [3] => Some(Attr::Italic),
            [4, 0] => Some(Attr::CancelUnderline),
            [4, 2] => Some(Attr::DoubleUnderline),
            [4, ..] => Some(Attr::Underline),
            [5] => Some(Attr::BlinkSlow),
            [6] => Some(Attr::BlinkFast),
            [7] => Some(Attr::Reverse),
            [8] => Some(Attr::Hidden),
            [9] => Some(Attr::Strike),
            [21] => Some(Attr::CancelBold),
            [22] => Some(Attr::CancelBoldDim),
            [23] => Some(Attr::CancelItalic),
            [24] => Some(Attr::CancelUnderline),
            [25] => Some(Attr::CancelBlink),
            [27] => Some(Attr::CancelReverse),
            [28] => Some(Attr::CancelHidden),
            [29] => Some(Attr::CancelStrike),
            [30] => Some(Attr::Foreground(Color::Named(NamedColor::Black))),
            [31] => Some(Attr::Foreground(Color::Named(NamedColor::Red))),
            [32] => Some(Attr::Foreground(Color::Named(NamedColor::Green))),
            [33] => Some(Attr::Foreground(Color::Named(NamedColor::Yellow))),
            [34] => Some(Attr::Foreground(Color::Named(NamedColor::Blue))),
            [35] => Some(Attr::Foreground(Color::Named(NamedColor::Magenta))),
            [36] => Some(Attr::Foreground(Color::Named(NamedColor::Cyan))),
            [37] => Some(Attr::Foreground(Color::Named(NamedColor::White))),
            [38] => {
                let mut iter = params.map(|param| param[0]);
                parse_sgr_color(&mut iter).map(Attr::Foreground)
            },
            [38, params @ ..] => {
                let rgb_start = if params.len() > 4 { 2 } else { 1 };
                let rgb_iter = params[rgb_start..].iter().copied();
                let mut iter = iter::once(params[0]).chain(rgb_iter);

                parse_sgr_color(&mut iter).map(Attr::Foreground)
            },
            [39] => Some(Attr::Foreground(Color::Named(NamedColor::Foreground))),
            [40] => Some(Attr::Background(Color::Named(NamedColor::Black))),
            [41] => Some(Attr::Background(Color::Named(NamedColor::Red))),
            [42] => Some(Attr::Background(Color::Named(NamedColor::Green))),
            [43] => Some(Attr::Background(Color::Named(NamedColor::Yellow))),
            [44] => Some(Attr::Background(Color::Named(NamedColor::Blue))),
            [45] => Some(Attr::Background(Color::Named(NamedColor::Magenta))),
            [46] => Some(Attr::Background(Color::Named(NamedColor::Cyan))),
            [47] => Some(Attr::Background(Color::Named(NamedColor::White))),
            [48] => {
                let mut iter = params.map(|param| param[0]);
                parse_sgr_color(&mut iter).map(Attr::Background)
            },
            [48, params @ ..] => {
                let rgb_start = if params.len() > 4 { 2 } else { 1 };
                let rgb_iter = params[rgb_start..].iter().copied();
                let mut iter = iter::once(params[0]).chain(rgb_iter);

                parse_sgr_color(&mut iter).map(Attr::Background)
            },
            [49] => Some(Attr::Background(Color::Named(NamedColor::Background))),
            [90] => Some(Attr::Foreground(Color::Named(NamedColor::BrightBlack))),
            [91] => Some(Attr::Foreground(Color::Named(NamedColor::BrightRed))),
            [92] => Some(Attr::Foreground(Color::Named(NamedColor::BrightGreen))),
            [93] => Some(Attr::Foreground(Color::Named(NamedColor::BrightYellow))),
            [94] => Some(Attr::Foreground(Color::Named(NamedColor::BrightBlue))),
            [95] => Some(Attr::Foreground(Color::Named(NamedColor::BrightMagenta))),
            [96] => Some(Attr::Foreground(Color::Named(NamedColor::BrightCyan))),
            [97] => Some(Attr::Foreground(Color::Named(NamedColor::BrightWhite))),
            [100] => Some(Attr::Background(Color::Named(NamedColor::BrightBlack))),
            [101] => Some(Attr::Background(Color::Named(NamedColor::BrightRed))),
            [102] => Some(Attr::Background(Color::Named(NamedColor::BrightGreen))),
            [103] => Some(Attr::Background(Color::Named(NamedColor::BrightYellow))),
            [104] => Some(Attr::Background(Color::Named(NamedColor::BrightBlue))),
            [105] => Some(Attr::Background(Color::Named(NamedColor::BrightMagenta))),
            [106] => Some(Attr::Background(Color::Named(NamedColor::BrightCyan))),
            [107] => Some(Attr::Background(Color::Named(NamedColor::BrightWhite))),
            _ => None,
        };
        attrs.push(attr);
    }

    attrs
}