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</pre><div class="example-wrap"><pre class="rust ">
<span class="kw">use</span> <span class="kw">super</span>::<span class="ident">TokenStreamExt</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">borrow</span>::<span class="ident">Cow</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">iter</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">rc</span>::<span class="ident">Rc</span>;
<span class="kw">use</span> <span class="ident">proc_macro2</span>::{<span class="ident">Group</span>, <span class="ident">Ident</span>, <span class="ident">Literal</span>, <span class="ident">Punct</span>, <span class="ident">Span</span>, <span class="ident">TokenStream</span>, <span class="ident">TokenTree</span>};
<span class="doccomment">/// Types that can be interpolated inside a [`quote!`] invocation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`quote!`]: macro.quote.html</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">ToTokens</span> {
<span class="doccomment">/// Write `self` to the given `TokenStream`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The token append methods provided by the [`TokenStreamExt`] extension</span>
<span class="doccomment">/// trait may be useful for implementing `ToTokens`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`TokenStreamExt`]: trait.TokenStreamExt.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Example</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Example implementation for a struct representing Rust paths like</span>
<span class="doccomment">/// `std::cmp::PartialEq`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```edition2018</span>
<span class="doccomment">/// use proc_macro2::{TokenTree, Spacing, Span, Punct, TokenStream};</span>
<span class="doccomment">/// use quote::{TokenStreamExt, ToTokens};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// pub struct Path {</span>
<span class="doccomment">/// pub global: bool,</span>
<span class="doccomment">/// pub segments: Vec<PathSegment>,</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl ToTokens for Path {</span>
<span class="doccomment">/// fn to_tokens(&self, tokens: &mut TokenStream) {</span>
<span class="doccomment">/// for (i, segment) in self.segments.iter().enumerate() {</span>
<span class="doccomment">/// if i > 0 || self.global {</span>
<span class="doccomment">/// // Double colon `::`</span>
<span class="doccomment">/// tokens.append(Punct::new(':', Spacing::Joint));</span>
<span class="doccomment">/// tokens.append(Punct::new(':', Spacing::Alone));</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// segment.to_tokens(tokens);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// #</span>
<span class="doccomment">/// # pub struct PathSegment;</span>
<span class="doccomment">/// #</span>
<span class="doccomment">/// # impl ToTokens for PathSegment {</span>
<span class="doccomment">/// # fn to_tokens(&self, tokens: &mut TokenStream) {</span>
<span class="doccomment">/// # unimplemented!()</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">tokens</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">TokenStream</span>);
<span class="doccomment">/// Convert `self` directly into a `TokenStream` object.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method is implicitly implemented using `to_tokens`, and acts as a</span>
<span class="doccomment">/// convenience method for consumers of the `ToTokens` trait.</span>
<span class="kw">fn</span> <span class="ident">into_token_stream</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">TokenStream</span>
<span class="kw">where</span>
<span class="self">Self</span>: <span class="ident">Sized</span>,
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">tokens</span> <span class="op">=</span> <span class="ident">TokenStream</span>::<span class="ident">new</span>();
<span class="self">self</span>.<span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">tokens</span>);
<span class="ident">tokens</span>
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">ToTokens</span><span class="op">></span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span> {
<span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">tokens</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">TokenStream</span>) {
(<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">to_tokens</span>(<span class="ident">tokens</span>);
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">ToTokens</span><span class="op">></span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">T</span> {
<span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">tokens</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">TokenStream</span>) {
(<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">to_tokens</span>(<span class="ident">tokens</span>);
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">ToOwned</span> <span class="op">+</span> <span class="ident">ToTokens</span><span class="op">></span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">Cow</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">tokens</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">TokenStream</span>) {
(<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">to_tokens</span>(<span class="ident">tokens</span>);
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">ToTokens</span><span class="op">></span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">Box</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">tokens</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">TokenStream</span>) {
(<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">to_tokens</span>(<span class="ident">tokens</span>);
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">ToTokens</span><span class="op">></span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">Rc</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">tokens</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">TokenStream</span>) {
(<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">to_tokens</span>(<span class="ident">tokens</span>);
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">ToTokens</span><span class="op">></span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">tokens</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">TokenStream</span>) {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">t</span>) <span class="op">=</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">t</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>);
}
}
}
<span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">str</span> {
<span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">tokens</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">TokenStream</span>) {
<span class="ident">tokens</span>.<span class="ident">append</span>(<span class="ident">Literal</span>::<span class="ident">string</span>(<span class="self">self</span>));
}
}
<span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">String</span> {
<span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">tokens</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">TokenStream</span>) {
<span class="self">self</span>.<span class="ident">as_str</span>().<span class="ident">to_tokens</span>(<span class="ident">tokens</span>);
}
}
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">primitive</span> {
($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">ident</span> <span class="op">=</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> ($(
<span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span> {
<span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">tokens</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">TokenStream</span>) {
<span class="ident">tokens</span>.<span class="ident">append</span>(<span class="ident">Literal</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>(<span class="kw-2">*</span><span class="self">self</span>));
}
}
)<span class="kw-2">*</span>)
}
<span class="macro">primitive</span><span class="macro">!</span> {
<span class="ident">i8</span> <span class="op">=</span><span class="op">></span> <span class="ident">i8_suffixed</span>
<span class="ident">i16</span> <span class="op">=</span><span class="op">></span> <span class="ident">i16_suffixed</span>
<span class="ident">i32</span> <span class="op">=</span><span class="op">></span> <span class="ident">i32_suffixed</span>
<span class="ident">i64</span> <span class="op">=</span><span class="op">></span> <span class="ident">i64_suffixed</span>
<span class="ident">isize</span> <span class="op">=</span><span class="op">></span> <span class="ident">isize_suffixed</span>
<span class="ident">u8</span> <span class="op">=</span><span class="op">></span> <span class="ident">u8_suffixed</span>
<span class="ident">u16</span> <span class="op">=</span><span class="op">></span> <span class="ident">u16_suffixed</span>
<span class="ident">u32</span> <span class="op">=</span><span class="op">></span> <span class="ident">u32_suffixed</span>
<span class="ident">u64</span> <span class="op">=</span><span class="op">></span> <span class="ident">u64_suffixed</span>
<span class="ident">usize</span> <span class="op">=</span><span class="op">></span> <span class="ident">usize_suffixed</span>
<span class="ident">f32</span> <span class="op">=</span><span class="op">></span> <span class="ident">f32_suffixed</span>
<span class="ident">f64</span> <span class="op">=</span><span class="op">></span> <span class="ident">f64_suffixed</span>
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">integer128</span>)]</span>
<span class="macro">primitive</span><span class="macro">!</span> {
<span class="ident">i128</span> <span class="op">=</span><span class="op">></span> <span class="ident">i128_suffixed</span>
<span class="ident">u128</span> <span class="op">=</span><span class="op">></span> <span class="ident">u128_suffixed</span>
}
<span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">char</span> {
<span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">tokens</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">TokenStream</span>) {
<span class="ident">tokens</span>.<span class="ident">append</span>(<span class="ident">Literal</span>::<span class="ident">character</span>(<span class="kw-2">*</span><span class="self">self</span>));
}
}
<span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">bool</span> {
<span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">tokens</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">TokenStream</span>) {
<span class="kw">let</span> <span class="ident">word</span> <span class="op">=</span> <span class="kw">if</span> <span class="kw-2">*</span><span class="self">self</span> { <span class="string">"true"</span> } <span class="kw">else</span> { <span class="string">"false"</span> };
<span class="ident">tokens</span>.<span class="ident">append</span>(<span class="ident">Ident</span>::<span class="ident">new</span>(<span class="ident">word</span>, <span class="ident">Span</span>::<span class="ident">call_site</span>()));
}
}
<span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">Group</span> {
<span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">tokens</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">TokenStream</span>) {
<span class="ident">tokens</span>.<span class="ident">append</span>(<span class="self">self</span>.<span class="ident">clone</span>());
}
}
<span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">Ident</span> {
<span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">tokens</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">TokenStream</span>) {
<span class="ident">tokens</span>.<span class="ident">append</span>(<span class="self">self</span>.<span class="ident">clone</span>());
}
}
<span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">Punct</span> {
<span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">tokens</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">TokenStream</span>) {
<span class="ident">tokens</span>.<span class="ident">append</span>(<span class="self">self</span>.<span class="ident">clone</span>());
}
}
<span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">Literal</span> {
<span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">tokens</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">TokenStream</span>) {
<span class="ident">tokens</span>.<span class="ident">append</span>(<span class="self">self</span>.<span class="ident">clone</span>());
}
}
<span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">TokenTree</span> {
<span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">dst</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">TokenStream</span>) {
<span class="ident">dst</span>.<span class="ident">append</span>(<span class="self">self</span>.<span class="ident">clone</span>());
}
}
<span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">TokenStream</span> {
<span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">dst</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">TokenStream</span>) {
<span class="ident">dst</span>.<span class="ident">extend</span>(<span class="ident">iter</span>::<span class="ident">once</span>(<span class="self">self</span>.<span class="ident">clone</span>()));
}
<span class="kw">fn</span> <span class="ident">into_token_stream</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">TokenStream</span> {
<span class="self">self</span>
}
}
</pre></div>
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