diff options
Diffstat (limited to 'quote/src/to_tokens.rs')
| -rw-r--r-- | quote/src/to_tokens.rs | 209 |
1 files changed, 0 insertions, 209 deletions
diff --git a/quote/src/to_tokens.rs b/quote/src/to_tokens.rs deleted file mode 100644 index 7f98083..0000000 --- a/quote/src/to_tokens.rs +++ /dev/null @@ -1,209 +0,0 @@ -use super::TokenStreamExt; - -use std::borrow::Cow; -use std::iter; -use std::rc::Rc; - -use proc_macro2::{Group, Ident, Literal, Punct, Span, TokenStream, TokenTree}; - -/// Types that can be interpolated inside a `quote!` invocation. -/// -/// [`quote!`]: macro.quote.html -pub trait ToTokens { - /// Write `self` to the given `TokenStream`. - /// - /// The token append methods provided by the [`TokenStreamExt`] extension - /// trait may be useful for implementing `ToTokens`. - /// - /// [`TokenStreamExt`]: trait.TokenStreamExt.html - /// - /// # Example - /// - /// Example implementation for a struct representing Rust paths like - /// `std::cmp::PartialEq`: - /// - /// ``` - /// use proc_macro2::{TokenTree, Spacing, Span, Punct, TokenStream}; - /// use quote::{TokenStreamExt, ToTokens}; - /// - /// pub struct Path { - /// pub global: bool, - /// pub segments: Vec<PathSegment>, - /// } - /// - /// impl ToTokens for Path { - /// fn to_tokens(&self, tokens: &mut TokenStream) { - /// for (i, segment) in self.segments.iter().enumerate() { - /// if i > 0 || self.global { - /// // Double colon `::` - /// tokens.append(Punct::new(':', Spacing::Joint)); - /// tokens.append(Punct::new(':', Spacing::Alone)); - /// } - /// segment.to_tokens(tokens); - /// } - /// } - /// } - /// # - /// # pub struct PathSegment; - /// # - /// # impl ToTokens for PathSegment { - /// # fn to_tokens(&self, tokens: &mut TokenStream) { - /// # unimplemented!() - /// # } - /// # } - /// ``` - fn to_tokens(&self, tokens: &mut TokenStream); - - /// Convert `self` directly into a `TokenStream` object. - /// - /// This method is implicitly implemented using `to_tokens`, and acts as a - /// convenience method for consumers of the `ToTokens` trait. - fn to_token_stream(&self) -> TokenStream { - let mut tokens = TokenStream::new(); - self.to_tokens(&mut tokens); - tokens - } - - /// Convert `self` directly into a `TokenStream` object. - /// - /// This method is implicitly implemented using `to_tokens`, and acts as a - /// convenience method for consumers of the `ToTokens` trait. - fn into_token_stream(self) -> TokenStream - where - Self: Sized, - { - self.to_token_stream() - } -} - -impl<'a, T: ?Sized + ToTokens> ToTokens for &'a T { - fn to_tokens(&self, tokens: &mut TokenStream) { - (**self).to_tokens(tokens); - } -} - -impl<'a, T: ?Sized + ToTokens> ToTokens for &'a mut T { - fn to_tokens(&self, tokens: &mut TokenStream) { - (**self).to_tokens(tokens); - } -} - -impl<'a, T: ?Sized + ToOwned + ToTokens> ToTokens for Cow<'a, T> { - fn to_tokens(&self, tokens: &mut TokenStream) { - (**self).to_tokens(tokens); - } -} - -impl<T: ?Sized + ToTokens> ToTokens for Box<T> { - fn to_tokens(&self, tokens: &mut TokenStream) { - (**self).to_tokens(tokens); - } -} - -impl<T: ?Sized + ToTokens> ToTokens for Rc<T> { - fn to_tokens(&self, tokens: &mut TokenStream) { - (**self).to_tokens(tokens); - } -} - -impl<T: ToTokens> ToTokens for Option<T> { - fn to_tokens(&self, tokens: &mut TokenStream) { - if let Some(ref t) = *self { - t.to_tokens(tokens); - } - } -} - -impl ToTokens for str { - fn to_tokens(&self, tokens: &mut TokenStream) { - tokens.append(Literal::string(self)); - } -} - -impl ToTokens for String { - fn to_tokens(&self, tokens: &mut TokenStream) { - self.as_str().to_tokens(tokens); - } -} - -macro_rules! primitive { - ($($t:ident => $name:ident)*) => ($( - impl ToTokens for $t { - fn to_tokens(&self, tokens: &mut TokenStream) { - tokens.append(Literal::$name(*self)); - } - } - )*) -} - -primitive! { - i8 => i8_suffixed - i16 => i16_suffixed - i32 => i32_suffixed - i64 => i64_suffixed - i128 => i128_suffixed - isize => isize_suffixed - - u8 => u8_suffixed - u16 => u16_suffixed - u32 => u32_suffixed - u64 => u64_suffixed - u128 => u128_suffixed - usize => usize_suffixed - - f32 => f32_suffixed - f64 => f64_suffixed -} - -impl ToTokens for char { - fn to_tokens(&self, tokens: &mut TokenStream) { - tokens.append(Literal::character(*self)); - } -} - -impl ToTokens for bool { - fn to_tokens(&self, tokens: &mut TokenStream) { - let word = if *self { "true" } else { "false" }; - tokens.append(Ident::new(word, Span::call_site())); - } -} - -impl ToTokens for Group { - fn to_tokens(&self, tokens: &mut TokenStream) { - tokens.append(self.clone()); - } -} - -impl ToTokens for Ident { - fn to_tokens(&self, tokens: &mut TokenStream) { - tokens.append(self.clone()); - } -} - -impl ToTokens for Punct { - fn to_tokens(&self, tokens: &mut TokenStream) { - tokens.append(self.clone()); - } -} - -impl ToTokens for Literal { - fn to_tokens(&self, tokens: &mut TokenStream) { - tokens.append(self.clone()); - } -} - -impl ToTokens for TokenTree { - fn to_tokens(&self, dst: &mut TokenStream) { - dst.append(self.clone()); - } -} - -impl ToTokens for TokenStream { - fn to_tokens(&self, dst: &mut TokenStream) { - dst.extend(iter::once(self.clone())); - } - - fn into_token_stream(self) -> TokenStream { - self - } -} |