Function format

crates/vm/src/format.rs:180–220

(
    format: &FormatString,
    arguments: &FuncArgs,
    vm: &VirtualMachine,
)

}

pub(crate) fn format(
    format: &FormatString,
    arguments: &FuncArgs,
    vm: &VirtualMachine,
) -> PyResult<Wtf8Buf> {
    let mut auto_argument_index: usize = 0;
    let mut seen_index = false;
    format_internal(vm, format, &mut |field_type| match field_type {
        FieldType::Auto => {
            if seen_index {
                return Err(vm.new_value_error(
                    "cannot switch from manual field specification to automatic field numbering",
                ));
            }
            auto_argument_index += 1;
            arguments
                .args
                .get(auto_argument_index - 1)
                .cloned()
                .ok_or_else(|| vm.new_index_error("tuple index out of range"))
        }
        FieldType::Index(index) => {
            if auto_argument_index != 0 {
                return Err(vm.new_value_error(
                    "cannot switch from automatic field numbering to manual field specification",
                ));
            }
            seen_index = true;
            arguments
                .args
                .get(index)
                .cloned()
                .ok_or_else(|| vm.new_index_error("tuple index out of range"))
        }
        FieldType::Keyword(keyword) => keyword
            .as_str()
            .ok()
            .and_then(|keyword| arguments.get_optional_kwarg(keyword))
            .ok_or_else(|| vm.new_key_error(vm.ctx.new_str(keyword).into())),
    })
}

pub(crate) fn format_map(
    format: &FormatString,