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</pre><pre class="rust ">
<span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>;
<span class="doccomment">/// Represents a macro invocation. The Path indicates which macro</span>
<span class="doccomment">/// is being invoked, and the vector of token-trees contains the source</span>
<span class="doccomment">/// of the macro invocation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// NB: the additional ident for a `macro_rules`-style macro is actually</span>
<span class="doccomment">/// stored in the enclosing item. Oog.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>, <span class="ident">Eq</span>, <span class="ident">PartialEq</span>, <span class="ident">Hash</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Mac</span> {
<span class="kw">pub</span> <span class="ident">path</span>: <span class="ident">Path</span>,
<span class="kw">pub</span> <span class="ident">tts</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">TokenTree</span><span class="op">></span>,
}
<span class="doccomment">/// When the main rust parser encounters a syntax-extension invocation, it</span>
<span class="doccomment">/// parses the arguments to the invocation as a token-tree. This is a very</span>
<span class="doccomment">/// loose structure, such that all sorts of different AST-fragments can</span>
<span class="doccomment">/// be passed to syntax extensions using a uniform type.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If the syntax extension is an MBE macro, it will attempt to match its</span>
<span class="doccomment">/// LHS token tree against the provided token tree, and if it finds a</span>
<span class="doccomment">/// match, will transcribe the RHS token tree, splicing in any captured</span>
<span class="doccomment">/// `macro_parser::matched_nonterminals` into the `SubstNt`s it finds.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The RHS of an MBE macro is the only place `SubstNt`s are substituted.</span>
<span class="doccomment">/// Nothing special happens to misnamed or misplaced `SubstNt`s.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>, <span class="ident">Eq</span>, <span class="ident">PartialEq</span>, <span class="ident">Hash</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">TokenTree</span> {
<span class="doccomment">/// A single token</span>
<span class="ident">Token</span>(<span class="ident">Token</span>),
<span class="doccomment">/// A delimited sequence of token trees</span>
<span class="ident">Delimited</span>(<span class="ident">Delimited</span>),
}
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>, <span class="ident">Eq</span>, <span class="ident">PartialEq</span>, <span class="ident">Hash</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Delimited</span> {
<span class="doccomment">/// The type of delimiter</span>
<span class="kw">pub</span> <span class="ident">delim</span>: <span class="ident">DelimToken</span>,
<span class="doccomment">/// The delimited sequence of token trees</span>
<span class="kw">pub</span> <span class="ident">tts</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">TokenTree</span><span class="op">></span>,
}
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>, <span class="ident">Eq</span>, <span class="ident">PartialEq</span>, <span class="ident">Hash</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Token</span> {
<span class="comment">// Expression-operator symbols.</span>
<span class="ident">Eq</span>,
<span class="ident">Lt</span>,
<span class="ident">Le</span>,
<span class="ident">EqEq</span>,
<span class="ident">Ne</span>,
<span class="ident">Ge</span>,
<span class="ident">Gt</span>,
<span class="ident">AndAnd</span>,
<span class="ident">OrOr</span>,
<span class="ident">Not</span>,
<span class="ident">Tilde</span>,
<span class="ident">BinOp</span>(<span class="ident">BinOpToken</span>),
<span class="ident">BinOpEq</span>(<span class="ident">BinOpToken</span>),
<span class="comment">// Structural symbols</span>
<span class="ident">At</span>,
<span class="ident">Dot</span>,
<span class="ident">DotDot</span>,
<span class="ident">DotDotDot</span>,
<span class="ident">Comma</span>,
<span class="ident">Semi</span>,
<span class="ident">Colon</span>,
<span class="ident">ModSep</span>,
<span class="ident">RArrow</span>,
<span class="ident">LArrow</span>,
<span class="ident">FatArrow</span>,
<span class="ident">Pound</span>,
<span class="ident">Dollar</span>,
<span class="ident">Question</span>,
<span class="comment">// Literals</span>
<span class="ident">Literal</span>(<span class="ident">Lit</span>),
<span class="comment">// Name components</span>
<span class="ident">Ident</span>(<span class="ident">Ident</span>),
<span class="ident">Underscore</span>,
<span class="ident">Lifetime</span>(<span class="ident">Ident</span>),
<span class="ident">DocComment</span>(<span class="ident">String</span>),
}
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Copy</span>, <span class="ident">Clone</span>, <span class="ident">Eq</span>, <span class="ident">PartialEq</span>, <span class="ident">Hash</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">BinOpToken</span> {
<span class="ident">Plus</span>,
<span class="ident">Minus</span>,
<span class="ident">Star</span>,
<span class="ident">Slash</span>,
<span class="ident">Percent</span>,
<span class="ident">Caret</span>,
<span class="ident">And</span>,
<span class="ident">Or</span>,
<span class="ident">Shl</span>,
<span class="ident">Shr</span>,
}
<span class="doccomment">/// A delimiter token</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Copy</span>, <span class="ident">Clone</span>, <span class="ident">Eq</span>, <span class="ident">PartialEq</span>, <span class="ident">Hash</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">DelimToken</span> {
<span class="doccomment">/// A round parenthesis: `(` or `)`</span>
<span class="ident">Paren</span>,
<span class="doccomment">/// A square bracket: `[` or `]`</span>
<span class="ident">Bracket</span>,
<span class="doccomment">/// A curly brace: `{` or `}`</span>
<span class="ident">Brace</span>,
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"parsing"</span>)]</span>
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">parsing</span> {
<span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="ident">Lifetime</span>;
<span class="kw">use</span> <span class="ident">generics</span>::<span class="ident">parsing</span>::<span class="ident">lifetime</span>;
<span class="kw">use</span> <span class="ident">ident</span>::<span class="ident">parsing</span>::<span class="ident">word</span>;
<span class="kw">use</span> <span class="ident">lit</span>::<span class="ident">parsing</span>::<span class="ident">lit</span>;
<span class="kw">use</span> <span class="ident">synom</span>::<span class="ident">space</span>::{<span class="ident">block_comment</span>, <span class="ident">whitespace</span>};
<span class="kw">use</span> <span class="ident">ty</span>::<span class="ident">parsing</span>::<span class="ident">path</span>;
<span class="macro">named</span><span class="macro">!</span>(<span class="kw">pub</span> <span class="ident">mac</span> <span class="op">-></span> <span class="ident">Mac</span>, <span class="macro">do_parse</span><span class="macro">!</span>(
<span class="ident">what</span>: <span class="ident">path</span> <span class="op">>></span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"!"</span>) <span class="op">>></span>
<span class="ident">body</span>: <span class="ident">delimited</span> <span class="op">>></span>
(<span class="ident">Mac</span> {
<span class="ident">path</span>: <span class="ident">what</span>,
<span class="ident">tts</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">TokenTree</span>::<span class="ident">Delimited</span>(<span class="ident">body</span>)],
})
));
<span class="macro">named</span><span class="macro">!</span>(<span class="kw">pub</span> <span class="ident">token_trees</span> <span class="op">-></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">TokenTree</span><span class="op">></span>, <span class="macro">many0</span><span class="macro">!</span>(<span class="ident">token_tree</span>));
<span class="macro">named</span><span class="macro">!</span>(<span class="kw">pub</span> <span class="ident">delimited</span> <span class="op">-></span> <span class="ident">Delimited</span>, <span class="macro">alt</span><span class="macro">!</span>(
<span class="macro">delimited</span><span class="macro">!</span>(
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"("</span>),
<span class="ident">token_trees</span>,
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">")"</span>)
) <span class="op">=></span> { <span class="op">|</span><span class="ident">tts</span><span class="op">|</span> <span class="ident">Delimited</span> { <span class="ident">delim</span>: <span class="ident">DelimToken</span>::<span class="ident">Paren</span>, <span class="ident">tts</span>: <span class="ident">tts</span> } }
<span class="op">|</span>
<span class="macro">delimited</span><span class="macro">!</span>(
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"["</span>),
<span class="ident">token_trees</span>,
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"]"</span>)
) <span class="op">=></span> { <span class="op">|</span><span class="ident">tts</span><span class="op">|</span> <span class="ident">Delimited</span> { <span class="ident">delim</span>: <span class="ident">DelimToken</span>::<span class="ident">Bracket</span>, <span class="ident">tts</span>: <span class="ident">tts</span> } }
<span class="op">|</span>
<span class="macro">delimited</span><span class="macro">!</span>(
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"{"</span>),
<span class="ident">token_trees</span>,
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"}"</span>)
) <span class="op">=></span> { <span class="op">|</span><span class="ident">tts</span><span class="op">|</span> <span class="ident">Delimited</span> { <span class="ident">delim</span>: <span class="ident">DelimToken</span>::<span class="ident">Brace</span>, <span class="ident">tts</span>: <span class="ident">tts</span> } }
));
<span class="macro">named</span><span class="macro">!</span>(<span class="kw">pub</span> <span class="ident">token_tree</span> <span class="op">-></span> <span class="ident">TokenTree</span>, <span class="macro">alt</span><span class="macro">!</span>(
<span class="macro">map</span><span class="macro">!</span>(<span class="ident">token</span>, <span class="ident">TokenTree</span>::<span class="ident">Token</span>)
<span class="op">|</span>
<span class="macro">map</span><span class="macro">!</span>(<span class="ident">delimited</span>, <span class="ident">TokenTree</span>::<span class="ident">Delimited</span>)
));
<span class="macro">named</span><span class="macro">!</span>(<span class="ident">token</span> <span class="op">-></span> <span class="ident">Token</span>, <span class="macro">alt</span><span class="macro">!</span>(
<span class="macro">keyword</span><span class="macro">!</span>(<span class="string">"_"</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">Token</span>::<span class="ident">Underscore</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"&&"</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">Token</span>::<span class="ident">AndAnd</span> } <span class="comment">// must be before BinOp</span>
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"||"</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">Token</span>::<span class="ident">OrOr</span> } <span class="comment">// must be before BinOp</span>
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"->"</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">Token</span>::<span class="ident">RArrow</span> } <span class="comment">// must be before BinOp</span>
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"<-"</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">Token</span>::<span class="ident">LArrow</span> } <span class="comment">// must be before Lt</span>
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"=>"</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">Token</span>::<span class="ident">FatArrow</span> } <span class="comment">// must be before Eq</span>
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"..."</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">Token</span>::<span class="ident">DotDotDot</span> } <span class="comment">// must be before DotDot</span>
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">".."</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">Token</span>::<span class="ident">DotDot</span> } <span class="comment">// must be before Dot</span>
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"."</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">Token</span>::<span class="ident">Dot</span> }
<span class="op">|</span>
<span class="macro">map</span><span class="macro">!</span>(<span class="ident">doc_comment</span>, <span class="ident">Token</span>::<span class="ident">DocComment</span>) <span class="comment">// must be before bin_op</span>
<span class="op">|</span>
<span class="macro">map</span><span class="macro">!</span>(<span class="ident">bin_op_eq</span>, <span class="ident">Token</span>::<span class="ident">BinOpEq</span>) <span class="comment">// must be before bin_op</span>
<span class="op">|</span>
<span class="macro">map</span><span class="macro">!</span>(<span class="ident">bin_op</span>, <span class="ident">Token</span>::<span class="ident">BinOp</span>)
<span class="op">|</span>
<span class="macro">map</span><span class="macro">!</span>(<span class="ident">lit</span>, <span class="ident">Token</span>::<span class="ident">Literal</span>)
<span class="op">|</span>
<span class="macro">map</span><span class="macro">!</span>(<span class="ident">word</span>, <span class="ident">Token</span>::<span class="ident">Ident</span>)
<span class="op">|</span>
<span class="macro">map</span><span class="macro">!</span>(<span class="ident">lifetime</span>, <span class="op">|</span><span class="ident">lt</span>: <span class="ident">Lifetime</span><span class="op">|</span> <span class="ident">Token</span>::<span class="ident">Lifetime</span>(<span class="ident">lt</span>.<span class="ident">ident</span>))
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"<="</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">Token</span>::<span class="ident">Le</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"=="</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">Token</span>::<span class="ident">EqEq</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"!="</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">Token</span>::<span class="ident">Ne</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">">="</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">Token</span>::<span class="ident">Ge</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"::"</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">Token</span>::<span class="ident">ModSep</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"="</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">Token</span>::<span class="ident">Eq</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"<"</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">Token</span>::<span class="ident">Lt</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">">"</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">Token</span>::<span class="ident">Gt</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"!"</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">Token</span>::<span class="ident">Not</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"~"</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">Token</span>::<span class="ident">Tilde</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"@"</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">Token</span>::<span class="ident">At</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">","</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">Token</span>::<span class="ident">Comma</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">";"</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">Token</span>::<span class="ident">Semi</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">":"</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">Token</span>::<span class="ident">Colon</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"#"</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">Token</span>::<span class="ident">Pound</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"$"</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">Token</span>::<span class="ident">Dollar</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"?"</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">Token</span>::<span class="ident">Question</span> }
));
<span class="macro">named</span><span class="macro">!</span>(<span class="ident">bin_op</span> <span class="op">-></span> <span class="ident">BinOpToken</span>, <span class="macro">alt</span><span class="macro">!</span>(
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"+"</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">BinOpToken</span>::<span class="ident">Plus</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"-"</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">BinOpToken</span>::<span class="ident">Minus</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"*"</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">BinOpToken</span>::<span class="ident">Star</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"/"</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">BinOpToken</span>::<span class="ident">Slash</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"%"</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">BinOpToken</span>::<span class="ident">Percent</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"^"</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">BinOpToken</span>::<span class="ident">Caret</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"&"</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">BinOpToken</span>::<span class="ident">And</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"|"</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">BinOpToken</span>::<span class="ident">Or</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"<<"</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">BinOpToken</span>::<span class="ident">Shl</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">">>"</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">BinOpToken</span>::<span class="ident">Shr</span> }
));
<span class="macro">named</span><span class="macro">!</span>(<span class="ident">bin_op_eq</span> <span class="op">-></span> <span class="ident">BinOpToken</span>, <span class="macro">alt</span><span class="macro">!</span>(
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"+="</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">BinOpToken</span>::<span class="ident">Plus</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"-="</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">BinOpToken</span>::<span class="ident">Minus</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"*="</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">BinOpToken</span>::<span class="ident">Star</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"/="</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">BinOpToken</span>::<span class="ident">Slash</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"%="</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">BinOpToken</span>::<span class="ident">Percent</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"^="</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">BinOpToken</span>::<span class="ident">Caret</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"&="</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">BinOpToken</span>::<span class="ident">And</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"|="</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">BinOpToken</span>::<span class="ident">Or</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"<<="</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">BinOpToken</span>::<span class="ident">Shl</span> }
<span class="op">|</span>
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">">>="</span>) <span class="op">=></span> { <span class="op">|</span>_<span class="op">|</span> <span class="ident">BinOpToken</span>::<span class="ident">Shr</span> }
));
<span class="macro">named</span><span class="macro">!</span>(<span class="ident">doc_comment</span> <span class="op">-></span> <span class="ident">String</span>, <span class="macro">alt</span><span class="macro">!</span>(
<span class="macro">do_parse</span><span class="macro">!</span>(
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"//!"</span>) <span class="op">>></span>
<span class="ident">content</span>: <span class="macro">take_until</span><span class="macro">!</span>(<span class="string">"\n"</span>) <span class="op">>></span>
(<span class="macro">format</span><span class="macro">!</span>(<span class="string">"//!{}"</span>, <span class="ident">content</span>))
)
<span class="op">|</span>
<span class="macro">do_parse</span><span class="macro">!</span>(
<span class="macro">option</span><span class="macro">!</span>(<span class="ident">whitespace</span>) <span class="op">>></span>
<span class="macro">peek</span><span class="macro">!</span>(<span class="macro">tag</span><span class="macro">!</span>(<span class="string">"/*!"</span>)) <span class="op">>></span>
<span class="ident">com</span>: <span class="ident">block_comment</span> <span class="op">>></span>
(<span class="ident">com</span>.<span class="ident">to_owned</span>())
)
<span class="op">|</span>
<span class="macro">do_parse</span><span class="macro">!</span>(
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"///"</span>) <span class="op">>></span>
<span class="macro">not</span><span class="macro">!</span>(<span class="macro">tag</span><span class="macro">!</span>(<span class="string">"/"</span>)) <span class="op">>></span>
<span class="ident">content</span>: <span class="macro">take_until</span><span class="macro">!</span>(<span class="string">"\n"</span>) <span class="op">>></span>
(<span class="macro">format</span><span class="macro">!</span>(<span class="string">"///{}"</span>, <span class="ident">content</span>))
)
<span class="op">|</span>
<span class="macro">do_parse</span><span class="macro">!</span>(
<span class="macro">option</span><span class="macro">!</span>(<span class="ident">whitespace</span>) <span class="op">>></span>
<span class="macro">peek</span><span class="macro">!</span>(<span class="macro">tuple</span><span class="macro">!</span>(<span class="macro">tag</span><span class="macro">!</span>(<span class="string">"/**"</span>), <span class="macro">not</span><span class="macro">!</span>(<span class="macro">tag</span><span class="macro">!</span>(<span class="string">"*"</span>)))) <span class="op">>></span>
<span class="ident">com</span>: <span class="ident">block_comment</span> <span class="op">>></span>
(<span class="ident">com</span>.<span class="ident">to_owned</span>())
)
));
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"printing"</span>)]</span>
<span class="kw">mod</span> <span class="ident">printing</span> {
<span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="ident">quote</span>::{<span class="ident">Tokens</span>, <span class="ident">ToTokens</span>};
<span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">Mac</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">Tokens</span>) {
<span class="self">self</span>.<span class="ident">path</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>);
<span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">"!"</span>);
<span class="kw">for</span> <span class="ident">tt</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">tts</span> {
<span class="ident">tt</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">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">tokens</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Tokens</span>) {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">TokenTree</span>::<span class="ident">Token</span>(<span class="kw-2">ref</span> <span class="ident">token</span>) <span class="op">=></span> <span class="ident">token</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>),
<span class="ident">TokenTree</span>::<span class="ident">Delimited</span>(<span class="kw-2">ref</span> <span class="ident">delimited</span>) <span class="op">=></span> <span class="ident">delimited</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>),
}
}
}
<span class="kw">impl</span> <span class="ident">DelimToken</span> {
<span class="kw">fn</span> <span class="ident">open</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">DelimToken</span>::<span class="ident">Paren</span> <span class="op">=></span> <span class="string">"("</span>,
<span class="ident">DelimToken</span>::<span class="ident">Bracket</span> <span class="op">=></span> <span class="string">"["</span>,
<span class="ident">DelimToken</span>::<span class="ident">Brace</span> <span class="op">=></span> <span class="string">"{"</span>,
}
}
<span class="kw">fn</span> <span class="ident">close</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">DelimToken</span>::<span class="ident">Paren</span> <span class="op">=></span> <span class="string">")"</span>,
<span class="ident">DelimToken</span>::<span class="ident">Bracket</span> <span class="op">=></span> <span class="string">"]"</span>,
<span class="ident">DelimToken</span>::<span class="ident">Brace</span> <span class="op">=></span> <span class="string">"}"</span>,
}
}
}
<span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">Delimited</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">Tokens</span>) {
<span class="ident">tokens</span>.<span class="ident">append</span>(<span class="self">self</span>.<span class="ident">delim</span>.<span class="ident">open</span>());
<span class="kw">for</span> <span class="ident">tt</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">tts</span> {
<span class="ident">tt</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>);
}
<span class="ident">tokens</span>.<span class="ident">append</span>(<span class="self">self</span>.<span class="ident">delim</span>.<span class="ident">close</span>());
}
}
<span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">Token</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">Tokens</span>) {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">Token</span>::<span class="ident">Eq</span> <span class="op">=></span> <span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">"="</span>),
<span class="ident">Token</span>::<span class="ident">Lt</span> <span class="op">=></span> <span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">"<"</span>),
<span class="ident">Token</span>::<span class="ident">Le</span> <span class="op">=></span> <span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">"<="</span>),
<span class="ident">Token</span>::<span class="ident">EqEq</span> <span class="op">=></span> <span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">"=="</span>),
<span class="ident">Token</span>::<span class="ident">Ne</span> <span class="op">=></span> <span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">"!="</span>),
<span class="ident">Token</span>::<span class="ident">Ge</span> <span class="op">=></span> <span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">">="</span>),
<span class="ident">Token</span>::<span class="ident">Gt</span> <span class="op">=></span> <span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">">"</span>),
<span class="ident">Token</span>::<span class="ident">AndAnd</span> <span class="op">=></span> <span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">"&&"</span>),
<span class="ident">Token</span>::<span class="ident">OrOr</span> <span class="op">=></span> <span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">"||"</span>),
<span class="ident">Token</span>::<span class="ident">Not</span> <span class="op">=></span> <span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">"!"</span>),
<span class="ident">Token</span>::<span class="ident">Tilde</span> <span class="op">=></span> <span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">"~"</span>),
<span class="ident">Token</span>::<span class="ident">BinOp</span>(<span class="ident">binop</span>) <span class="op">=></span> <span class="ident">tokens</span>.<span class="ident">append</span>(<span class="ident">binop</span>.<span class="ident">op</span>()),
<span class="ident">Token</span>::<span class="ident">BinOpEq</span>(<span class="ident">binop</span>) <span class="op">=></span> <span class="ident">tokens</span>.<span class="ident">append</span>(<span class="ident">binop</span>.<span class="ident">assign_op</span>()),
<span class="ident">Token</span>::<span class="ident">At</span> <span class="op">=></span> <span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">"@"</span>),
<span class="ident">Token</span>::<span class="ident">Dot</span> <span class="op">=></span> <span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">"."</span>),
<span class="ident">Token</span>::<span class="ident">DotDot</span> <span class="op">=></span> <span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">".."</span>),
<span class="ident">Token</span>::<span class="ident">DotDotDot</span> <span class="op">=></span> <span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">"..."</span>),
<span class="ident">Token</span>::<span class="ident">Comma</span> <span class="op">=></span> <span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">","</span>),
<span class="ident">Token</span>::<span class="ident">Semi</span> <span class="op">=></span> <span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">";"</span>),
<span class="ident">Token</span>::<span class="ident">Colon</span> <span class="op">=></span> <span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">":"</span>),
<span class="ident">Token</span>::<span class="ident">ModSep</span> <span class="op">=></span> <span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">"::"</span>),
<span class="ident">Token</span>::<span class="ident">RArrow</span> <span class="op">=></span> <span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">"->"</span>),
<span class="ident">Token</span>::<span class="ident">LArrow</span> <span class="op">=></span> <span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">"<-"</span>),
<span class="ident">Token</span>::<span class="ident">FatArrow</span> <span class="op">=></span> <span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">"=>"</span>),
<span class="ident">Token</span>::<span class="ident">Pound</span> <span class="op">=></span> <span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">"#"</span>),
<span class="ident">Token</span>::<span class="ident">Dollar</span> <span class="op">=></span> <span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">"$"</span>),
<span class="ident">Token</span>::<span class="ident">Question</span> <span class="op">=></span> <span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">"?"</span>),
<span class="ident">Token</span>::<span class="ident">Literal</span>(<span class="kw-2">ref</span> <span class="ident">lit</span>) <span class="op">=></span> <span class="ident">lit</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>),
<span class="ident">Token</span>::<span class="ident">Ident</span>(<span class="kw-2">ref</span> <span class="ident">ident</span>) <span class="op">|</span>
<span class="ident">Token</span>::<span class="ident">Lifetime</span>(<span class="kw-2">ref</span> <span class="ident">ident</span>) <span class="op">=></span> <span class="ident">ident</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>),
<span class="ident">Token</span>::<span class="ident">Underscore</span> <span class="op">=></span> <span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">"_"</span>),
<span class="ident">Token</span>::<span class="ident">DocComment</span>(<span class="kw-2">ref</span> <span class="ident">com</span>) <span class="op">=></span> {
<span class="ident">tokens</span>.<span class="ident">append</span>(<span class="kw-2">&</span><span class="macro">format</span><span class="macro">!</span>(<span class="string">"{}\n"</span>, <span class="ident">com</span>));
}
}
}
}
<span class="kw">impl</span> <span class="ident">BinOpToken</span> {
<span class="kw">fn</span> <span class="ident">op</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">BinOpToken</span>::<span class="ident">Plus</span> <span class="op">=></span> <span class="string">"+"</span>,
<span class="ident">BinOpToken</span>::<span class="ident">Minus</span> <span class="op">=></span> <span class="string">"-"</span>,
<span class="ident">BinOpToken</span>::<span class="ident">Star</span> <span class="op">=></span> <span class="string">"*"</span>,
<span class="ident">BinOpToken</span>::<span class="ident">Slash</span> <span class="op">=></span> <span class="string">"/"</span>,
<span class="ident">BinOpToken</span>::<span class="ident">Percent</span> <span class="op">=></span> <span class="string">"%"</span>,
<span class="ident">BinOpToken</span>::<span class="ident">Caret</span> <span class="op">=></span> <span class="string">"^"</span>,
<span class="ident">BinOpToken</span>::<span class="ident">And</span> <span class="op">=></span> <span class="string">"&"</span>,
<span class="ident">BinOpToken</span>::<span class="ident">Or</span> <span class="op">=></span> <span class="string">"|"</span>,
<span class="ident">BinOpToken</span>::<span class="ident">Shl</span> <span class="op">=></span> <span class="string">"<<"</span>,
<span class="ident">BinOpToken</span>::<span class="ident">Shr</span> <span class="op">=></span> <span class="string">">>"</span>,
}
}
<span class="kw">fn</span> <span class="ident">assign_op</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">BinOpToken</span>::<span class="ident">Plus</span> <span class="op">=></span> <span class="string">"+="</span>,
<span class="ident">BinOpToken</span>::<span class="ident">Minus</span> <span class="op">=></span> <span class="string">"-="</span>,
<span class="ident">BinOpToken</span>::<span class="ident">Star</span> <span class="op">=></span> <span class="string">"*="</span>,
<span class="ident">BinOpToken</span>::<span class="ident">Slash</span> <span class="op">=></span> <span class="string">"/="</span>,
<span class="ident">BinOpToken</span>::<span class="ident">Percent</span> <span class="op">=></span> <span class="string">"%="</span>,
<span class="ident">BinOpToken</span>::<span class="ident">Caret</span> <span class="op">=></span> <span class="string">"^="</span>,
<span class="ident">BinOpToken</span>::<span class="ident">And</span> <span class="op">=></span> <span class="string">"&="</span>,
<span class="ident">BinOpToken</span>::<span class="ident">Or</span> <span class="op">=></span> <span class="string">"|="</span>,
<span class="ident">BinOpToken</span>::<span class="ident">Shl</span> <span class="op">=></span> <span class="string">"<<="</span>,
<span class="ident">BinOpToken</span>::<span class="ident">Shr</span> <span class="op">=></span> <span class="string">">>="</span>,
}
}
}
<span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">BinOpToken</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">Tokens</span>) {
<span class="ident">tokens</span>.<span class="ident">append</span>(<span class="self">self</span>.<span class="ident">op</span>());
}
}
}
</pre>
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