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use super::Tokens;
use std::borrow::Cow;
use proc_macro2::{Literal, Span, Term, TokenNode, TokenTree, TokenStream};
fn tt(kind: TokenNode) -> TokenTree {
TokenTree {
span: Span::def_site(),
kind: kind,
}
}
pub trait ToTokens {
fn to_tokens(&self, tokens: &mut Tokens);
fn into_tokens(self) -> Tokens
where
Self: Sized,
{
let mut tokens = Tokens::new();
self.to_tokens(&mut tokens);
tokens
}
}
impl<'a, T: ?Sized + ToTokens> ToTokens for &'a T {
fn to_tokens(&self, tokens: &mut Tokens) {
(**self).to_tokens(tokens);
}
}
impl<'a, T: ?Sized + ToOwned + ToTokens> ToTokens for Cow<'a, T> {
fn to_tokens(&self, tokens: &mut Tokens) {
(**self).to_tokens(tokens);
}
}
impl<T: ?Sized + ToTokens> ToTokens for Box<T> {
fn to_tokens(&self, tokens: &mut Tokens) {
(**self).to_tokens(tokens);
}
}
impl<T: ToTokens> ToTokens for Option<T> {
fn to_tokens(&self, tokens: &mut Tokens) {
if let Some(ref t) = *self {
t.to_tokens(tokens);
}
}
}
impl ToTokens for str {
fn to_tokens(&self, tokens: &mut Tokens) {
tokens.append(tt(TokenNode::Literal(Literal::string(self))));
}
}
impl ToTokens for String {
fn to_tokens(&self, tokens: &mut Tokens) {
self.as_str().to_tokens(tokens);
}
}
macro_rules! primitive {
($($t:ident)*) => ($(
impl ToTokens for $t {
fn to_tokens(&self, tokens: &mut Tokens) {
tokens.append(tt(TokenNode::Literal(Literal::$t(*self))));
}
}
)*)
}
primitive! {
i8 i16 i32 i64 isize
u8 u16 u32 u64 usize
f32 f64
}
impl ToTokens for char {
fn to_tokens(&self, tokens: &mut Tokens) {
tokens.append(tt(TokenNode::Literal(Literal::character(*self))));
}
}
impl ToTokens for bool {
fn to_tokens(&self, tokens: &mut Tokens) {
let word = if *self { "true" } else { "false" };
tokens.append(tt(TokenNode::Term(Term::intern(word))));
}
}
impl ToTokens for Term {
fn to_tokens(&self, tokens: &mut Tokens) {
tokens.append(tt(TokenNode::Term(*self)));
}
}
impl ToTokens for Literal {
fn to_tokens(&self, tokens: &mut Tokens) {
tokens.append(tt(TokenNode::Literal(self.clone())));
}
}
impl ToTokens for TokenNode {
fn to_tokens(&self, tokens: &mut Tokens) {
tokens.append(tt(self.clone()));
}
}
impl ToTokens for TokenTree {
fn to_tokens(&self, dst: &mut Tokens) {
dst.append(self.clone());
}
}
impl ToTokens for TokenStream {
fn to_tokens(&self, dst: &mut Tokens) {
dst.append_all(self.clone().into_iter());
}
}