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</pre><pre class="rust ">
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">proc_macro</span>;
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">syn</span>;
<span class="attribute">#[<span class="ident">macro_use</span>]</span> <span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">synstructure</span>;
<span class="attribute">#[<span class="ident">macro_use</span>]</span> <span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">quote</span>;
<span class="macro">decl_derive</span><span class="macro">!</span>([<span class="ident">Fail</span>, <span class="ident">attributes</span>(<span class="ident">fail</span>, <span class="ident">cause</span>)] <span class="op">=></span> <span class="ident">fail_derive</span>);
<span class="kw">fn</span> <span class="ident">fail_derive</span>(<span class="ident">s</span>: <span class="ident">synstructure</span>::<span class="ident">Structure</span>) <span class="op">-></span> <span class="ident">quote</span>::<span class="ident">Tokens</span> {
<span class="kw">let</span> <span class="ident">cause_body</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">each_variant</span>(<span class="op">|</span><span class="ident">v</span><span class="op">|</span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">cause</span>) <span class="op">=</span> <span class="ident">v</span>.<span class="ident">bindings</span>().<span class="ident">iter</span>().<span class="ident">find</span>(<span class="ident">is_cause</span>) {
<span class="macro">quote</span><span class="macro">!</span>(<span class="kw">return</span> <span class="prelude-val">Some</span>(#<span class="ident">cause</span>))
} <span class="kw">else</span> {
<span class="macro">quote</span><span class="macro">!</span>(<span class="kw">return</span> <span class="prelude-val">None</span>)
}
});
<span class="kw">let</span> <span class="ident">bt_body</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">each_variant</span>(<span class="op">|</span><span class="ident">v</span><span class="op">|</span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">bi</span>) <span class="op">=</span> <span class="ident">v</span>.<span class="ident">bindings</span>().<span class="ident">iter</span>().<span class="ident">find</span>(<span class="ident">is_backtrace</span>) {
<span class="macro">quote</span><span class="macro">!</span>(<span class="kw">return</span> <span class="prelude-val">Some</span>(#<span class="ident">bi</span>))
} <span class="kw">else</span> {
<span class="macro">quote</span><span class="macro">!</span>(<span class="kw">return</span> <span class="prelude-val">None</span>)
}
});
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std"</span>)]</span>
<span class="kw">let</span> <span class="ident">fail</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">bound_impl</span>(<span class="string">"::failure::Fail"</span>, <span class="macro">quote</span><span class="macro">!</span> {
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unreachable_code</span>)]</span>
<span class="kw">fn</span> <span class="ident">cause</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> ::<span class="ident">std</span>::<span class="ident">option</span>::<span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span>::<span class="ident">failure</span>::<span class="ident">Fail</span><span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { #<span class="ident">cause_body</span> }
<span class="prelude-val">None</span>
}
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unreachable_code</span>)]</span>
<span class="kw">fn</span> <span class="ident">backtrace</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> ::<span class="ident">std</span>::<span class="ident">option</span>::<span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span>::<span class="ident">failure</span>::<span class="ident">Backtrace</span><span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { #<span class="ident">bt_body</span> }
<span class="prelude-val">None</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">"std"</span>))]</span>
<span class="kw">let</span> <span class="ident">fail</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">bound_impl</span>(<span class="string">"::failure::Fail"</span>, <span class="macro">quote</span><span class="macro">!</span> {
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unreachable_code</span>)]</span>
<span class="kw">fn</span> <span class="ident">cause</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> ::<span class="ident">core</span>::<span class="ident">option</span>::<span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span>::<span class="ident">failure</span>::<span class="ident">Fail</span><span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { #<span class="ident">cause_body</span> }
<span class="prelude-val">None</span>
}
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unreachable_code</span>)]</span>
<span class="kw">fn</span> <span class="ident">backtrace</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> ::<span class="ident">core</span>::<span class="ident">option</span>::<span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span>::<span class="ident">failure</span>::<span class="ident">Backtrace</span><span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { #<span class="ident">bt_body</span> }
<span class="prelude-val">None</span>
}
});
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std"</span>)]</span>
<span class="kw">let</span> <span class="ident">display</span> <span class="op">=</span> <span class="ident">display_body</span>(<span class="kw-2">&</span><span class="ident">s</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">display_body</span><span class="op">|</span> {
<span class="ident">s</span>.<span class="ident">bound_impl</span>(<span class="string">"::std::fmt::Display"</span>, <span class="macro">quote</span><span class="macro">!</span> {
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unreachable_code</span>)]</span>
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> ::<span class="ident">std</span>::<span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> ::<span class="ident">std</span>::<span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { #<span class="ident">display_body</span> }
<span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"An error has occurred."</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">"std"</span>))]</span>
<span class="kw">let</span> <span class="ident">display</span> <span class="op">=</span> <span class="ident">display_body</span>(<span class="kw-2">&</span><span class="ident">s</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">display_body</span><span class="op">|</span> {
<span class="ident">s</span>.<span class="ident">bound_impl</span>(<span class="string">"::core::fmt::Display"</span>, <span class="macro">quote</span><span class="macro">!</span> {
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unreachable_code</span>)]</span>
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> ::<span class="ident">core</span>::<span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> ::<span class="ident">core</span>::<span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { #<span class="ident">display_body</span> }
<span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"An error has occurred."</span>)
}
})
});
<span class="macro">quote</span><span class="macro">!</span> {
#<span class="ident">fail</span>
#<span class="ident">display</span>
}
}
<span class="kw">fn</span> <span class="ident">display_body</span>(<span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">synstructure</span>::<span class="ident">Structure</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">quote</span>::<span class="ident">Tokens</span><span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">msgs</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">variants</span>().<span class="ident">iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">v</span><span class="op">|</span> <span class="ident">find_error_msg</span>(<span class="kw-2">&</span><span class="ident">v</span>.<span class="ident">ast</span>().<span class="ident">attrs</span>));
<span class="kw">if</span> <span class="ident">msgs</span>.<span class="ident">all</span>(<span class="op">|</span><span class="ident">msg</span><span class="op">|</span> <span class="ident">msg</span>.<span class="ident">is_none</span>()) { <span class="kw">return</span> <span class="prelude-val">None</span>; }
<span class="prelude-val">Some</span>(<span class="ident">s</span>.<span class="ident">each_variant</span>(<span class="op">|</span><span class="ident">v</span><span class="op">|</span> {
<span class="kw">let</span> <span class="ident">msg</span> <span class="op">=</span> <span class="ident">find_error_msg</span>(<span class="kw-2">&</span><span class="ident">v</span>.<span class="ident">ast</span>().<span class="ident">attrs</span>).<span class="ident">expect</span>(<span class="string">"All variants must have display attribute."</span>);
<span class="kw">if</span> <span class="ident">msg</span>.<span class="ident">is_empty</span>() {
<span class="macro">panic</span><span class="macro">!</span>(<span class="string">"Expected at least one argument to fail attribute"</span>);
}
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">msg</span>[<span class="number">0</span>] {
<span class="ident">syn</span>::<span class="ident">NestedMetaItem</span>::<span class="ident">MetaItem</span>(<span class="ident">syn</span>::<span class="ident">MetaItem</span>::<span class="ident">NameValue</span>(<span class="kw-2">ref</span> <span class="ident">i</span>, <span class="kw-2">ref</span> <span class="ident">lit</span>)) <span class="kw">if</span> <span class="ident">i</span> <span class="op">==</span> <span class="string">"display"</span> <span class="op">=></span> {
<span class="ident">lit</span>.<span class="ident">clone</span>()
}
_ <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"Fail attribute must begin `display = \"\"` to control the Display message."</span>),
};
<span class="kw">let</span> <span class="ident">args</span> <span class="op">=</span> <span class="ident">msg</span>[<span class="number">1</span>..].<span class="ident">iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">arg</span><span class="op">|</span> <span class="kw">match</span> <span class="kw-2">*</span><span class="ident">arg</span> {
<span class="ident">syn</span>::<span class="ident">NestedMetaItem</span>::<span class="ident">Literal</span>(<span class="ident">syn</span>::<span class="ident">Lit</span>::<span class="ident">Int</span>(<span class="ident">i</span>, _)) <span class="op">=></span> {
<span class="kw">let</span> <span class="ident">bi</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">v</span>.<span class="ident">bindings</span>()[<span class="ident">i</span> <span class="kw">as</span> <span class="ident">usize</span>];
<span class="macro">quote</span><span class="macro">!</span>(#<span class="ident">bi</span>)
}
<span class="ident">syn</span>::<span class="ident">NestedMetaItem</span>::<span class="ident">MetaItem</span>(<span class="ident">syn</span>::<span class="ident">MetaItem</span>::<span class="ident">Word</span>(<span class="kw-2">ref</span> <span class="ident">id</span>)) <span class="op">=></span> {
<span class="kw">if</span> <span class="ident">id</span>.<span class="ident">as_ref</span>().<span class="ident">starts_with</span>(<span class="string">"_"</span>) {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">idx</span>) <span class="op">=</span> <span class="ident">id</span>.<span class="ident">as_ref</span>()[<span class="number">1</span>..].<span class="ident">parse</span>::<span class="op"><</span><span class="ident">usize</span><span class="op">></span>() {
<span class="kw">let</span> <span class="ident">bi</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">v</span>.<span class="ident">bindings</span>()[<span class="ident">idx</span>];
<span class="kw">return</span> <span class="macro">quote</span><span class="macro">!</span>(#<span class="ident">bi</span>)
}
}
<span class="kw">for</span> <span class="ident">bi</span> <span class="kw">in</span> <span class="ident">v</span>.<span class="ident">bindings</span>() {
<span class="kw">if</span> <span class="ident">bi</span>.<span class="ident">ast</span>().<span class="ident">ident</span>.<span class="ident">as_ref</span>() <span class="op">==</span> <span class="prelude-val">Some</span>(<span class="ident">id</span>) {
<span class="kw">return</span> <span class="macro">quote</span><span class="macro">!</span>(#<span class="ident">bi</span>);
}
}
<span class="macro">panic</span><span class="macro">!</span>(<span class="string">"Couldn't find a field with this name!"</span>);
}
_ <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"Invalid argument to fail attribute!"</span>),
});
<span class="macro">quote</span><span class="macro">!</span> {
<span class="kw">return</span> <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, #<span class="ident">s</span> #(, #<span class="ident">args</span>)<span class="kw-2">*</span>)
}
}))
}
<span class="kw">fn</span> <span class="ident">find_error_msg</span>(<span class="ident">attrs</span>: <span class="kw-2">&</span>[<span class="ident">syn</span>::<span class="ident">Attribute</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span>[<span class="ident">syn</span>::<span class="ident">NestedMetaItem</span>]<span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">error_msg</span> <span class="op">=</span> <span class="prelude-val">None</span>;
<span class="kw">for</span> <span class="ident">attr</span> <span class="kw">in</span> <span class="ident">attrs</span> {
<span class="kw">if</span> <span class="ident">attr</span>.<span class="ident">name</span>() <span class="op">==</span> <span class="string">"fail"</span> {
<span class="kw">if</span> <span class="ident">error_msg</span>.<span class="ident">is_some</span>() {
<span class="macro">panic</span><span class="macro">!</span>(<span class="string">"Cannot have two display attributes"</span>)
} <span class="kw">else</span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="ident">syn</span>::<span class="ident">MetaItem</span>::<span class="ident">List</span>(_, <span class="kw-2">ref</span> <span class="ident">list</span>) <span class="op">=</span> <span class="ident">attr</span>.<span class="ident">value</span> {
<span class="ident">error_msg</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="ident">list</span>[..]);
} <span class="kw">else</span> {
<span class="macro">panic</span><span class="macro">!</span>(<span class="string">"fail attribute must take a list in parantheses"</span>)
}
}
}
}
<span class="ident">error_msg</span>
}
<span class="kw">fn</span> <span class="ident">is_backtrace</span>(<span class="ident">bi</span>: <span class="op">&&</span><span class="ident">synstructure</span>::<span class="ident">BindingInfo</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw">match</span> <span class="ident">bi</span>.<span class="ident">ast</span>().<span class="ident">ty</span> {
<span class="ident">syn</span>::<span class="ident">Ty</span>::<span class="ident">Path</span>(<span class="prelude-val">None</span>, <span class="ident">syn</span>::<span class="ident">Path</span> { <span class="ident">segments</span>: <span class="kw-2">ref</span> <span class="ident">path</span>, .. }) <span class="op">=></span> {
<span class="ident">path</span>.<span class="ident">last</span>().<span class="ident">map_or</span>(<span class="bool-val">false</span>, <span class="op">|</span><span class="ident">s</span><span class="op">|</span> <span class="ident">s</span>.<span class="ident">ident</span> <span class="op">==</span> <span class="string">"Backtrace"</span> <span class="op">&&</span> <span class="ident">s</span>.<span class="ident">parameters</span>.<span class="ident">is_empty</span>())
}
_ <span class="op">=></span> <span class="bool-val">false</span>
}
}
<span class="kw">fn</span> <span class="ident">is_cause</span>(<span class="ident">bi</span>: <span class="op">&&</span><span class="ident">synstructure</span>::<span class="ident">BindingInfo</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="ident">bi</span>.<span class="ident">ast</span>().<span class="ident">attrs</span>.<span class="ident">iter</span>().<span class="ident">any</span>(<span class="op">|</span><span class="ident">attr</span><span class="op">|</span> <span class="ident">attr</span>.<span class="ident">name</span>() <span class="op">==</span> <span class="string">"cause"</span>)
}
</pre>
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