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use quote::{self, ToTokens};
use syn;
pub fn lit_to_string(lit: &syn::Lit) -> Option<String> {
match *lit {
syn::Lit::Str(ref s, _) => Some(s.to_string()),
_ => None,
}
}
pub fn lit_to_int(lit: &syn::Lit) -> Option<u64> {
match *lit {
syn::Lit::Int(ref s, _) => Some(*s),
// TODO: remove when attr_literals is stable
syn::Lit::Str(ref s, _) => Some(s.parse::<u64>().unwrap()),
_ => None,
}
}
pub fn lit_to_float(lit: &syn::Lit) -> Option<f64> {
match *lit {
syn::Lit::Float(ref s, _) => Some(s.parse::<f64>().unwrap()),
syn::Lit::Int(ref s, _) => Some(*s as f64),
// TODO: remove when attr_literals is stable
syn::Lit::Str(ref s, _) => Some(s.parse::<f64>().unwrap()),
_ => None,
}
}
pub fn lit_to_bool(lit: &syn::Lit) -> Option<bool> {
match *lit {
syn::Lit::Bool(ref s) => Some(*s),
// TODO: remove when attr_literals is stable
syn::Lit::Str(ref s, _) => if s == "true" { Some(true) } else { Some(false) },
_ => None,
}
}
pub fn option_u64_to_tokens(opt: Option<u64>) -> quote::Tokens {
let mut tokens = quote::Tokens::new();
tokens.append("::");
tokens.append("std");
tokens.append("::");
tokens.append("option");
tokens.append("::");
tokens.append("Option");
tokens.append("::");
match opt {
Some(ref t) => {
tokens.append("Some");
tokens.append("(");
t.to_tokens(&mut tokens);
tokens.append(")");
}
None => {
tokens.append("None");
}
}
tokens
}
|
