Macro ascii_case_insensitive_phf_map

macro_rules! ascii_case_insensitive_phf_map {
    ($name: ident -> $ValueType: ty = { $( $key: tt => $value: expr ),+ }) => { ... };
    ($name: ident -> $ValueType: ty = { $( $key: tt => $value: expr, )+ }) => { ... };
}

Define a function $name(&str) -> Option<&'static $ValueType>

The function finds a match for the input string in a phf map and returns a reference to the corresponding value. Matching is case-insensitive in the ASCII range.

Example:

fn color_rgb(input: &str) -> Option<(u8, u8, u8)> {
    cssparser::ascii_case_insensitive_phf_map! {
        keyword -> (u8, u8, u8) = {
            "red" => (255, 0, 0),
            "green" => (0, 255, 0),
            "blue" => (0, 0, 255),
        }
    }
    keyword(input).cloned()
}