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use syn;
use proc_macro2;
pub fn lit_to_string(lit: &syn::Lit) -> Option<String> {
match *lit {
syn::Lit::Str(ref s) => Some(s.value()),
_ => None,
}
}
pub fn lit_to_int(lit: &syn::Lit) -> Option<u64> {
match *lit {
syn::Lit::Int(ref s) => Some(s.value()),
// TODO: remove when attr_literals is stable
syn::Lit::Str(ref s) => Some(s.value().parse::<u64>().unwrap()),
_ => None,
}
}
pub fn lit_to_float(lit: &syn::Lit) -> Option<f64> {
match *lit {
syn::Lit::Float(ref s) => Some(s.value()),
syn::Lit::Int(ref s) => Some(s.value() as f64),
// TODO: remove when attr_literals is stable
syn::Lit::Str(ref s) => Some(s.value().parse::<f64>().unwrap()),
_ => None,
}
}
pub fn lit_to_bool(lit: &syn::Lit) -> Option<bool> {
match *lit {
syn::Lit::Bool(ref s) => Some(s.value),
// TODO: remove when attr_literals is stable
syn::Lit::Str(ref s) => if s.value() == "true" { Some(true) } else { Some(false) },
_ => None,
}
}
pub fn option_u64_to_tokens(opt: Option<u64>) -> proc_macro2::TokenStream {
match opt {
Some(ref t) => quote!(::std::option::Option::Some(#t)),
None => quote!(::std::option::Option::None)
}
}
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