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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="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">ConstExpr</span> {
<span class="doccomment">/// A function call</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The first field resolves to the function itself,</span>
<span class="doccomment">/// and the second field is the list of arguments</span>
<span class="ident">Call</span>(<span class="ident">Box</span><span class="op"><</span><span class="ident">ConstExpr</span><span class="op">></span>, <span class="ident">Vec</span><span class="op"><</span><span class="ident">ConstExpr</span><span class="op">></span>),
<span class="doccomment">/// A binary operation (For example: `a + b`, `a * b`)</span>
<span class="ident">Binary</span>(<span class="ident">BinOp</span>, <span class="ident">Box</span><span class="op"><</span><span class="ident">ConstExpr</span><span class="op">></span>, <span class="ident">Box</span><span class="op"><</span><span class="ident">ConstExpr</span><span class="op">></span>),
<span class="doccomment">/// A unary operation (For example: `!x`, `*x`)</span>
<span class="ident">Unary</span>(<span class="ident">UnOp</span>, <span class="ident">Box</span><span class="op"><</span><span class="ident">ConstExpr</span><span class="op">></span>),
<span class="doccomment">/// A literal (For example: `1`, `"foo"`)</span>
<span class="ident">Lit</span>(<span class="ident">Lit</span>),
<span class="doccomment">/// A cast (`foo as f64`)</span>
<span class="ident">Cast</span>(<span class="ident">Box</span><span class="op"><</span><span class="ident">ConstExpr</span><span class="op">></span>, <span class="ident">Box</span><span class="op"><</span><span class="ident">Ty</span><span class="op">></span>),
<span class="doccomment">/// Variable reference, possibly containing `::` and/or type</span>
<span class="doccomment">/// parameters, e.g. foo::bar::<baz>.</span>
<span class="ident">Path</span>(<span class="ident">Path</span>),
<span class="doccomment">/// An indexing operation (`foo[2]`)</span>
<span class="ident">Index</span>(<span class="ident">Box</span><span class="op"><</span><span class="ident">ConstExpr</span><span class="op">></span>, <span class="ident">Box</span><span class="op"><</span><span class="ident">ConstExpr</span><span class="op">></span>),
<span class="doccomment">/// No-op: used solely so we can pretty-print faithfully</span>
<span class="ident">Paren</span>(<span class="ident">Box</span><span class="op"><</span><span class="ident">ConstExpr</span><span class="op">></span>),
<span class="doccomment">/// If compiling with full support for expression syntax, any expression is</span>
<span class="doccomment">/// allowed</span>
<span class="ident">Other</span>(<span class="ident">Other</span>),
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"full"</span>))]</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">Other</span> {
<span class="ident">_private</span>: (),
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"full"</span>)]</span>
<span class="kw">pub</span> <span class="kw">type</span> <span class="ident">Other</span> <span class="op">=</span> <span class="ident">Expr</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">BinOp</span>, <span class="ident">Ty</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">op</span>::<span class="ident">parsing</span>::{<span class="ident">binop</span>, <span class="ident">unop</span>};
<span class="kw">use</span> <span class="ident">ty</span>::<span class="ident">parsing</span>::{<span class="ident">path</span>, <span class="ident">ty</span>};
<span class="macro">named</span><span class="macro">!</span>(<span class="kw">pub</span> <span class="ident">const_expr</span> <span class="op">-></span> <span class="ident">ConstExpr</span>, <span class="macro">do_parse</span><span class="macro">!</span>(
<span class="kw-2">mut</span> <span class="ident">e</span>: <span class="macro">alt</span><span class="macro">!</span>(
<span class="ident">expr_unary</span>
<span class="op">|</span>
<span class="ident">expr_lit</span>
<span class="op">|</span>
<span class="ident">expr_path</span>
<span class="op">|</span>
<span class="ident">expr_paren</span>
<span class="comment">// Cannot handle ConstExpr::Other here because for example</span>
<span class="comment">// `[u32; n!()]` would end up successfully parsing `n` as</span>
<span class="comment">// ConstExpr::Path and then fail to parse `!()`. Instead, callers</span>
<span class="comment">// are required to handle Other. See ty::parsing::array_len and</span>
<span class="comment">// data::parsing::discriminant.</span>
) <span class="op">>></span>
<span class="macro">many0</span><span class="macro">!</span>(<span class="macro">alt</span><span class="macro">!</span>(
<span class="macro">tap</span><span class="macro">!</span>(<span class="ident">args</span>: <span class="ident">and_call</span> <span class="op">=></span> {
<span class="ident">e</span> <span class="op">=</span> <span class="ident">ConstExpr</span>::<span class="ident">Call</span>(<span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">e</span>), <span class="ident">args</span>);
})
<span class="op">|</span>
<span class="macro">tap</span><span class="macro">!</span>(<span class="ident">more</span>: <span class="ident">and_binary</span> <span class="op">=></span> {
<span class="kw">let</span> (<span class="ident">op</span>, <span class="ident">other</span>) <span class="op">=</span> <span class="ident">more</span>;
<span class="ident">e</span> <span class="op">=</span> <span class="ident">ConstExpr</span>::<span class="ident">Binary</span>(<span class="ident">op</span>, <span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">e</span>), <span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">other</span>));
})
<span class="op">|</span>
<span class="macro">tap</span><span class="macro">!</span>(<span class="ident">ty</span>: <span class="ident">and_cast</span> <span class="op">=></span> {
<span class="ident">e</span> <span class="op">=</span> <span class="ident">ConstExpr</span>::<span class="ident">Cast</span>(<span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">e</span>), <span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">ty</span>));
})
<span class="op">|</span>
<span class="macro">tap</span><span class="macro">!</span>(<span class="ident">i</span>: <span class="ident">and_index</span> <span class="op">=></span> {
<span class="ident">e</span> <span class="op">=</span> <span class="ident">ConstExpr</span>::<span class="ident">Index</span>(<span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">e</span>), <span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">i</span>));
})
)) <span class="op">>></span>
(<span class="ident">e</span>)
));
<span class="macro">named</span><span class="macro">!</span>(<span class="ident">and_call</span> <span class="op">-></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">ConstExpr</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="ident">args</span>: <span class="macro">terminated_list</span><span class="macro">!</span>(<span class="macro">punct</span><span class="macro">!</span>(<span class="string">","</span>), <span class="ident">const_expr</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">args</span>)
));
<span class="macro">named</span><span class="macro">!</span>(<span class="ident">and_binary</span> <span class="op">-></span> (<span class="ident">BinOp</span>, <span class="ident">ConstExpr</span>), <span class="macro">tuple</span><span class="macro">!</span>(<span class="ident">binop</span>, <span class="ident">const_expr</span>));
<span class="macro">named</span><span class="macro">!</span>(<span class="ident">expr_unary</span> <span class="op">-></span> <span class="ident">ConstExpr</span>, <span class="macro">do_parse</span><span class="macro">!</span>(
<span class="ident">operator</span>: <span class="ident">unop</span> <span class="op">>></span>
<span class="ident">operand</span>: <span class="ident">const_expr</span> <span class="op">>></span>
(<span class="ident">ConstExpr</span>::<span class="ident">Unary</span>(<span class="ident">operator</span>, <span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">operand</span>)))
));
<span class="macro">named</span><span class="macro">!</span>(<span class="ident">expr_lit</span> <span class="op">-></span> <span class="ident">ConstExpr</span>, <span class="macro">map</span><span class="macro">!</span>(<span class="ident">lit</span>, <span class="ident">ConstExpr</span>::<span class="ident">Lit</span>));
<span class="macro">named</span><span class="macro">!</span>(<span class="ident">expr_path</span> <span class="op">-></span> <span class="ident">ConstExpr</span>, <span class="macro">map</span><span class="macro">!</span>(<span class="ident">path</span>, <span class="ident">ConstExpr</span>::<span class="ident">Path</span>));
<span class="macro">named</span><span class="macro">!</span>(<span class="ident">and_index</span> <span class="op">-></span> <span class="ident">ConstExpr</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">const_expr</span>, <span class="macro">punct</span><span class="macro">!</span>(<span class="string">"]"</span>)));
<span class="macro">named</span><span class="macro">!</span>(<span class="ident">expr_paren</span> <span class="op">-></span> <span class="ident">ConstExpr</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">e</span>: <span class="ident">const_expr</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">ConstExpr</span>::<span class="ident">Paren</span>(<span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">e</span>)))
));
<span class="macro">named</span><span class="macro">!</span>(<span class="ident">and_cast</span> <span class="op">-></span> <span class="ident">Ty</span>, <span class="macro">do_parse</span><span class="macro">!</span>(
<span class="macro">keyword</span><span class="macro">!</span>(<span class="string">"as"</span>) <span class="op">>></span>
<span class="ident">ty</span>: <span class="ident">ty</span> <span class="op">>></span>
(<span class="ident">ty</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">ConstExpr</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">ConstExpr</span>::<span class="ident">Call</span>(<span class="kw-2">ref</span> <span class="ident">func</span>, <span class="kw-2">ref</span> <span class="ident">args</span>) <span class="op">=></span> {
<span class="ident">func</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="ident">tokens</span>.<span class="ident">append_separated</span>(<span class="ident">args</span>, <span class="string">","</span>);
<span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">")"</span>);
}
<span class="ident">ConstExpr</span>::<span class="ident">Binary</span>(<span class="ident">op</span>, <span class="kw-2">ref</span> <span class="ident">left</span>, <span class="kw-2">ref</span> <span class="ident">right</span>) <span class="op">=></span> {
<span class="ident">left</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>);
<span class="ident">op</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>);
<span class="ident">right</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>);
}
<span class="ident">ConstExpr</span>::<span class="ident">Unary</span>(<span class="ident">op</span>, <span class="kw-2">ref</span> <span class="ident">expr</span>) <span class="op">=></span> {
<span class="ident">op</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>);
<span class="ident">expr</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>);
}
<span class="ident">ConstExpr</span>::<span class="ident">Lit</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">ConstExpr</span>::<span class="ident">Cast</span>(<span class="kw-2">ref</span> <span class="ident">expr</span>, <span class="kw-2">ref</span> <span class="ident">ty</span>) <span class="op">=></span> {
<span class="ident">expr</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">"as"</span>);
<span class="ident">ty</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>);
}
<span class="ident">ConstExpr</span>::<span class="ident">Path</span>(<span class="kw-2">ref</span> <span class="ident">path</span>) <span class="op">=></span> <span class="ident">path</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>),
<span class="ident">ConstExpr</span>::<span class="ident">Index</span>(<span class="kw-2">ref</span> <span class="ident">expr</span>, <span class="kw-2">ref</span> <span class="ident">index</span>) <span class="op">=></span> {
<span class="ident">expr</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="ident">index</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="ident">ConstExpr</span>::<span class="ident">Paren</span>(<span class="kw-2">ref</span> <span class="ident">expr</span>) <span class="op">=></span> {
<span class="ident">tokens</span>.<span class="ident">append</span>(<span class="string">"("</span>);
<span class="ident">expr</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="ident">ConstExpr</span>::<span class="ident">Other</span>(<span class="kw-2">ref</span> <span class="ident">other</span>) <span class="op">=></span> {
<span class="ident">other</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>);
}
}
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"full"</span>))]</span>
<span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">Other</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="macro">unreachable</span><span class="macro">!</span>()
}
}
}
</pre>
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