Function gen_iterator

cranelift/codegen/meta/src/gen_settings.rs:54–72

Generates the `iter` function.

(group: &SettingGroup, fmt: &mut Formatter)

/// Generates the `iter` function.
fn gen_iterator(group: &SettingGroup, fmt: &mut Formatter) {
    fmt.add_block("impl Flags",|fmt| {
        fmt.doc_comment("Iterates the setting values.");
        fmt.add_block("pub fn iter(&self) -> impl Iterator<Item = Value> + use<>",|fmt| {
            fmtln!(fmt, "let mut bytes = [0; {}];", group.settings_size);
            fmtln!(fmt, "bytes.copy_from_slice(&self.bytes[0..{}]);", group.settings_size);
            fmt.add_block("DESCRIPTORS.iter().filter_map(move |d|", |fmt| {
                fmt.add_block("let values = match &d.detail", |fmt| {
                    fmtln!(fmt, "detail::Detail::Preset => return None,");
                    fmtln!(fmt, "detail::Detail::Enum {{ last, enumerators }} => Some(TEMPLATE.enums(*last, *enumerators)),");
                    fmtln!(fmt, "_ => None");
                });
                fmtln!(fmt, ";");
                fmtln!(fmt, "Some(Value {{ name: d.name, detail: d.detail, values, value: bytes[d.offset as usize] }})");
            });
            fmtln!(fmt, ")");
        });
    });
}

/// Generates a `all()` function with all options for this enum
fn gen_enum_all(name: &str, values: &[&'static str], fmt: &mut Formatter) {