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</pre><pre class="rust"><code><span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::error::Result</span>;
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::parse::ParseBuffer</span>;
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::token</span>;
<span class="kw">use</span> <span class="ident">proc_macro2</span>::{<span class="ident">Delimiter</span>, <span class="ident">Span</span>};
<span class="comment">// Not public API.</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Parens</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
<span class="kw">pub</span> <span class="ident">token</span>: <span class="ident">token::Paren</span>,
<span class="kw">pub</span> <span class="ident">content</span>: <span class="ident">ParseBuffer</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>,
}
<span class="comment">// Not public API.</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Braces</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
<span class="kw">pub</span> <span class="ident">token</span>: <span class="ident">token::Brace</span>,
<span class="kw">pub</span> <span class="ident">content</span>: <span class="ident">ParseBuffer</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>,
}
<span class="comment">// Not public API.</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Brackets</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
<span class="kw">pub</span> <span class="ident">token</span>: <span class="ident">token::Bracket</span>,
<span class="kw">pub</span> <span class="ident">content</span>: <span class="ident">ParseBuffer</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>,
}
<span class="comment">// Not public API.</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;derive&quot;</span>))]</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Group</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
<span class="kw">pub</span> <span class="ident">token</span>: <span class="ident">token::Group</span>,
<span class="kw">pub</span> <span class="ident">content</span>: <span class="ident">ParseBuffer</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>,
}
<span class="comment">// Not public API.</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parse_parens</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>(<span class="ident">input</span>: <span class="kw-2">&amp;</span><span class="ident">ParseBuffer</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Parens</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span><span class="op">&gt;</span> {
<span class="ident">parse_delimited</span>(<span class="ident">input</span>, <span class="ident">Delimiter::Parenthesis</span>).<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">span</span>, <span class="ident">content</span>)<span class="op">|</span> <span class="ident">Parens</span> {
<span class="ident">token</span>: <span class="ident">token::Paren</span>(<span class="ident">span</span>),
<span class="ident">content</span>,
})
}
<span class="comment">// Not public API.</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parse_braces</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>(<span class="ident">input</span>: <span class="kw-2">&amp;</span><span class="ident">ParseBuffer</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Braces</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span><span class="op">&gt;</span> {
<span class="ident">parse_delimited</span>(<span class="ident">input</span>, <span class="ident">Delimiter::Brace</span>).<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">span</span>, <span class="ident">content</span>)<span class="op">|</span> <span class="ident">Braces</span> {
<span class="ident">token</span>: <span class="ident">token::Brace</span>(<span class="ident">span</span>),
<span class="ident">content</span>,
})
}
<span class="comment">// Not public API.</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parse_brackets</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>(<span class="ident">input</span>: <span class="kw-2">&amp;</span><span class="ident">ParseBuffer</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Brackets</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span><span class="op">&gt;</span> {
<span class="ident">parse_delimited</span>(<span class="ident">input</span>, <span class="ident">Delimiter::Bracket</span>).<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">span</span>, <span class="ident">content</span>)<span class="op">|</span> <span class="ident">Brackets</span> {
<span class="ident">token</span>: <span class="ident">token::Bracket</span>(<span class="ident">span</span>),
<span class="ident">content</span>,
})
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;derive&quot;</span>))]</span>
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">parse_group</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>(<span class="ident">input</span>: <span class="kw-2">&amp;</span><span class="ident">ParseBuffer</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Group</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span><span class="op">&gt;</span> {
<span class="ident">parse_delimited</span>(<span class="ident">input</span>, <span class="ident">Delimiter::None</span>).<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">span</span>, <span class="ident">content</span>)<span class="op">|</span> <span class="ident">Group</span> {
<span class="ident">token</span>: <span class="ident">token::Group</span>(<span class="ident">span</span>),
<span class="ident">content</span>,
})
}
<span class="kw">fn</span> <span class="ident">parse_delimited</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>(
<span class="ident">input</span>: <span class="kw-2">&amp;</span><span class="ident">ParseBuffer</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>,
<span class="ident">delimiter</span>: <span class="ident">Delimiter</span>,
) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span>(<span class="ident">Span</span>, <span class="ident">ParseBuffer</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>)<span class="op">&gt;</span> {
<span class="ident">input</span>.<span class="ident">step</span>(<span class="op">|</span><span class="ident">cursor</span><span class="op">|</span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">content</span>, <span class="ident">span</span>, <span class="ident">rest</span>)) <span class="op">=</span> <span class="ident">cursor</span>.<span class="ident">group</span>(<span class="ident">delimiter</span>) {
<span class="kw">let</span> <span class="ident">scope</span> <span class="op">=</span> <span class="ident"><span class="kw">crate</span>::buffer::close_span_of_group</span>(<span class="kw-2">*</span><span class="ident">cursor</span>);
<span class="kw">let</span> <span class="ident">nested</span> <span class="op">=</span> <span class="ident"><span class="kw">crate</span>::parse::advance_step_cursor</span>(<span class="ident">cursor</span>, <span class="ident">content</span>);
<span class="kw">let</span> <span class="ident">unexpected</span> <span class="op">=</span> <span class="ident"><span class="kw">crate</span>::parse::get_unexpected</span>(<span class="ident">input</span>);
<span class="kw">let</span> <span class="ident">content</span> <span class="op">=</span> <span class="ident"><span class="kw">crate</span>::parse::new_parse_buffer</span>(<span class="ident">scope</span>, <span class="ident">nested</span>, <span class="ident">unexpected</span>);
<span class="prelude-val">Ok</span>(((<span class="ident">span</span>, <span class="ident">content</span>), <span class="ident">rest</span>))
} <span class="kw">else</span> {
<span class="kw">let</span> <span class="ident">message</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">delimiter</span> {
<span class="ident">Delimiter::Parenthesis</span> =&gt; <span class="string">&quot;expected parentheses&quot;</span>,
<span class="ident">Delimiter::Brace</span> =&gt; <span class="string">&quot;expected curly braces&quot;</span>,
<span class="ident">Delimiter::Bracket</span> =&gt; <span class="string">&quot;expected square brackets&quot;</span>,
<span class="ident">Delimiter::None</span> =&gt; <span class="string">&quot;expected invisible group&quot;</span>,
};
<span class="prelude-val">Err</span>(<span class="ident">cursor</span>.<span class="ident">error</span>(<span class="ident">message</span>))
}
})
}
<span class="doccomment">/// Parse a set of parentheses and expose their content to subsequent parsers.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Example</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # use quote::quote;</span>
<span class="doccomment">/// #</span>
<span class="doccomment">/// use syn::{parenthesized, token, Ident, Result, Token, Type};</span>
<span class="doccomment">/// use syn::parse::{Parse, ParseStream};</span>
<span class="doccomment">/// use syn::punctuated::Punctuated;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Parse a simplified tuple struct syntax like:</span>
<span class="doccomment">/// //</span>
<span class="doccomment">/// // struct S(A, B);</span>
<span class="doccomment">/// struct TupleStruct {</span>
<span class="doccomment">/// struct_token: Token![struct],</span>
<span class="doccomment">/// ident: Ident,</span>
<span class="doccomment">/// paren_token: token::Paren,</span>
<span class="doccomment">/// fields: Punctuated&lt;Type, Token![,]&gt;,</span>
<span class="doccomment">/// semi_token: Token![;],</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl Parse for TupleStruct {</span>
<span class="doccomment">/// fn parse(input: ParseStream) -&gt; Result&lt;Self&gt; {</span>
<span class="doccomment">/// let content;</span>
<span class="doccomment">/// Ok(TupleStruct {</span>
<span class="doccomment">/// struct_token: input.parse()?,</span>
<span class="doccomment">/// ident: input.parse()?,</span>
<span class="doccomment">/// paren_token: parenthesized!(content in input),</span>
<span class="doccomment">/// fields: content.parse_terminated(Type::parse)?,</span>
<span class="doccomment">/// semi_token: input.parse()?,</span>
<span class="doccomment">/// })</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// #</span>
<span class="doccomment">/// # fn main() {</span>
<span class="doccomment">/// # let input = quote! {</span>
<span class="doccomment">/// # struct S(A, B);</span>
<span class="doccomment">/// # };</span>
<span class="doccomment">/// # syn::parse2::&lt;TupleStruct&gt;(input).unwrap();</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)))]</span>
<span class="macro">macro_rules!</span> <span class="ident">parenthesized</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">content</span>:<span class="ident">ident</span> <span class="kw">in</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">cursor</span>:<span class="ident">expr</span>) =&gt; {
<span class="kw">match</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">crate::group::parse_parens</span>(<span class="kw-2">&amp;</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">cursor</span>) {
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">crate::__private::Ok</span>(<span class="ident">parens</span>) =&gt; {
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">content</span> <span class="op">=</span> <span class="ident">parens</span>.<span class="ident">content</span>;
<span class="ident">parens</span>.<span class="ident">token</span>
}
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">crate::__private::Err</span>(<span class="ident">error</span>) =&gt; {
<span class="kw">return</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">crate::__private::Err</span>(<span class="ident">error</span>);
}
}
};
}
<span class="doccomment">/// Parse a set of curly braces and expose their content to subsequent parsers.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Example</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # use quote::quote;</span>
<span class="doccomment">/// #</span>
<span class="doccomment">/// use syn::{braced, token, Ident, Result, Token, Type};</span>
<span class="doccomment">/// use syn::parse::{Parse, ParseStream};</span>
<span class="doccomment">/// use syn::punctuated::Punctuated;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Parse a simplified struct syntax like:</span>
<span class="doccomment">/// //</span>
<span class="doccomment">/// // struct S {</span>
<span class="doccomment">/// // a: A,</span>
<span class="doccomment">/// // b: B,</span>
<span class="doccomment">/// // }</span>
<span class="doccomment">/// struct Struct {</span>
<span class="doccomment">/// struct_token: Token![struct],</span>
<span class="doccomment">/// ident: Ident,</span>
<span class="doccomment">/// brace_token: token::Brace,</span>
<span class="doccomment">/// fields: Punctuated&lt;Field, Token![,]&gt;,</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// struct Field {</span>
<span class="doccomment">/// name: Ident,</span>
<span class="doccomment">/// colon_token: Token![:],</span>
<span class="doccomment">/// ty: Type,</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl Parse for Struct {</span>
<span class="doccomment">/// fn parse(input: ParseStream) -&gt; Result&lt;Self&gt; {</span>
<span class="doccomment">/// let content;</span>
<span class="doccomment">/// Ok(Struct {</span>
<span class="doccomment">/// struct_token: input.parse()?,</span>
<span class="doccomment">/// ident: input.parse()?,</span>
<span class="doccomment">/// brace_token: braced!(content in input),</span>
<span class="doccomment">/// fields: content.parse_terminated(Field::parse)?,</span>
<span class="doccomment">/// })</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl Parse for Field {</span>
<span class="doccomment">/// fn parse(input: ParseStream) -&gt; Result&lt;Self&gt; {</span>
<span class="doccomment">/// Ok(Field {</span>
<span class="doccomment">/// name: input.parse()?,</span>
<span class="doccomment">/// colon_token: input.parse()?,</span>
<span class="doccomment">/// ty: input.parse()?,</span>
<span class="doccomment">/// })</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// #</span>
<span class="doccomment">/// # fn main() {</span>
<span class="doccomment">/// # let input = quote! {</span>
<span class="doccomment">/// # struct S {</span>
<span class="doccomment">/// # a: A,</span>
<span class="doccomment">/// # b: B,</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// # };</span>
<span class="doccomment">/// # syn::parse2::&lt;Struct&gt;(input).unwrap();</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)))]</span>
<span class="macro">macro_rules!</span> <span class="ident">braced</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">content</span>:<span class="ident">ident</span> <span class="kw">in</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">cursor</span>:<span class="ident">expr</span>) =&gt; {
<span class="kw">match</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">crate::group::parse_braces</span>(<span class="kw-2">&amp;</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">cursor</span>) {
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">crate::__private::Ok</span>(<span class="ident">braces</span>) =&gt; {
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">content</span> <span class="op">=</span> <span class="ident">braces</span>.<span class="ident">content</span>;
<span class="ident">braces</span>.<span class="ident">token</span>
}
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">crate::__private::Err</span>(<span class="ident">error</span>) =&gt; {
<span class="kw">return</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">crate::__private::Err</span>(<span class="ident">error</span>);
}
}
};
}
<span class="doccomment">/// Parse a set of square brackets and expose their content to subsequent</span>
<span class="doccomment">/// parsers.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Example</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # use quote::quote;</span>
<span class="doccomment">/// #</span>
<span class="doccomment">/// use proc_macro2::TokenStream;</span>
<span class="doccomment">/// use syn::{bracketed, token, Result, Token};</span>
<span class="doccomment">/// use syn::parse::{Parse, ParseStream};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Parse an outer attribute like:</span>
<span class="doccomment">/// //</span>
<span class="doccomment">/// // #[repr(C, packed)]</span>
<span class="doccomment">/// struct OuterAttribute {</span>
<span class="doccomment">/// pound_token: Token![#],</span>
<span class="doccomment">/// bracket_token: token::Bracket,</span>
<span class="doccomment">/// content: TokenStream,</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl Parse for OuterAttribute {</span>
<span class="doccomment">/// fn parse(input: ParseStream) -&gt; Result&lt;Self&gt; {</span>
<span class="doccomment">/// let content;</span>
<span class="doccomment">/// Ok(OuterAttribute {</span>
<span class="doccomment">/// pound_token: input.parse()?,</span>
<span class="doccomment">/// bracket_token: bracketed!(content in input),</span>
<span class="doccomment">/// content: content.parse()?,</span>
<span class="doccomment">/// })</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// #</span>
<span class="doccomment">/// # fn main() {</span>
<span class="doccomment">/// # let input = quote! {</span>
<span class="doccomment">/// # #[repr(C, packed)]</span>
<span class="doccomment">/// # };</span>
<span class="doccomment">/// # syn::parse2::&lt;OuterAttribute&gt;(input).unwrap();</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)))]</span>
<span class="macro">macro_rules!</span> <span class="ident">bracketed</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">content</span>:<span class="ident">ident</span> <span class="kw">in</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">cursor</span>:<span class="ident">expr</span>) =&gt; {
<span class="kw">match</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">crate::group::parse_brackets</span>(<span class="kw-2">&amp;</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">cursor</span>) {
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">crate::__private::Ok</span>(<span class="ident">brackets</span>) =&gt; {
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">content</span> <span class="op">=</span> <span class="ident">brackets</span>.<span class="ident">content</span>;
<span class="ident">brackets</span>.<span class="ident">token</span>
}
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">crate::__private::Err</span>(<span class="ident">error</span>) =&gt; {
<span class="kw">return</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">crate::__private::Err</span>(<span class="ident">error</span>);
}
}
};
}
</code></pre></div>
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