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</pre><pre class="rust ">
<span class="comment">// Copyright 2017 The Rust Project Developers. See the COPYRIGHT</span>
<span class="comment">// file at the top-level directory of this distribution and at</span>
<span class="comment">// http://rust-lang.org/COPYRIGHT.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>
<span class="kw">use</span> <span class="ident">Span</span>;
<span class="kw">use</span> <span class="ident">rustc_errors</span> <span class="kw">as</span> <span class="ident">rustc</span>;
<span class="doccomment">/// An enum representing a diagnostic level.</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"proc_macro"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"38356"</span>)]</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Copy</span>, <span class="ident">Clone</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Level</span> {
<span class="doccomment">/// An error.</span>
<span class="ident">Error</span>,
<span class="doccomment">/// A warning.</span>
<span class="ident">Warning</span>,
<span class="doccomment">/// A note.</span>
<span class="ident">Note</span>,
<span class="doccomment">/// A help message.</span>
<span class="ident">Help</span>,
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="ident">__Nonexhaustive</span>,
}
<span class="doccomment">/// A structure representing a diagnostic message and associated children</span>
<span class="doccomment">/// messages.</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"proc_macro"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"38356"</span>)]</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Diagnostic</span> {
<span class="ident">level</span>: <span class="ident">Level</span>,
<span class="ident">message</span>: <span class="ident">String</span>,
<span class="ident">span</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Span</span><span class="op">></span>,
<span class="ident">children</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">Diagnostic</span><span class="op">></span>
}
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">diagnostic_child_methods</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">spanned</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">regular</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">level</span>:<span class="ident">expr</span>) <span class="op">=></span> (
<span class="doccomment">/// Add a new child diagnostic message to `self` with the level</span>
<span class="doccomment">/// identified by this methods name with the given `span` and `message`.</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"proc_macro"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"38356"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">spanned</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Into</span><span class="op"><</span><span class="ident">String</span><span class="op">>></span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">span</span>: <span class="ident">Span</span>, <span class="ident">message</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">Diagnostic</span> {
<span class="self">self</span>.<span class="ident">children</span>.<span class="ident">push</span>(<span class="ident">Diagnostic</span>::<span class="ident">spanned</span>(<span class="ident">span</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">level</span>, <span class="ident">message</span>));
<span class="self">self</span>
}
<span class="doccomment">/// Add a new child diagnostic message to `self` with the level</span>
<span class="doccomment">/// identified by this method's name with the given `message`.</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"proc_macro"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"38356"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">regular</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Into</span><span class="op"><</span><span class="ident">String</span><span class="op">>></span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">message</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">Diagnostic</span> {
<span class="self">self</span>.<span class="ident">children</span>.<span class="ident">push</span>(<span class="ident">Diagnostic</span>::<span class="ident">new</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">level</span>, <span class="ident">message</span>));
<span class="self">self</span>
}
)
}
<span class="kw">impl</span> <span class="ident">Diagnostic</span> {
<span class="doccomment">/// Create a new diagnostic with the given `level` and `message`.</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"proc_macro"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"38356"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Into</span><span class="op"><</span><span class="ident">String</span><span class="op">>></span>(<span class="ident">level</span>: <span class="ident">Level</span>, <span class="ident">message</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">Diagnostic</span> {
<span class="ident">Diagnostic</span> {
<span class="ident">level</span>: <span class="ident">level</span>,
<span class="ident">message</span>: <span class="ident">message</span>.<span class="ident">into</span>(),
<span class="ident">span</span>: <span class="prelude-val">None</span>,
<span class="ident">children</span>: <span class="macro">vec</span><span class="macro">!</span>[]
}
}
<span class="doccomment">/// Create a new diagnostic with the given `level` and `message` pointing to</span>
<span class="doccomment">/// the given `span`.</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"proc_macro"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"38356"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">spanned</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Into</span><span class="op"><</span><span class="ident">String</span><span class="op">>></span>(<span class="ident">span</span>: <span class="ident">Span</span>, <span class="ident">level</span>: <span class="ident">Level</span>, <span class="ident">message</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">Diagnostic</span> {
<span class="ident">Diagnostic</span> {
<span class="ident">level</span>: <span class="ident">level</span>,
<span class="ident">message</span>: <span class="ident">message</span>.<span class="ident">into</span>(),
<span class="ident">span</span>: <span class="prelude-val">Some</span>(<span class="ident">span</span>),
<span class="ident">children</span>: <span class="macro">vec</span><span class="macro">!</span>[]
}
}
<span class="macro">diagnostic_child_methods</span><span class="macro">!</span>(<span class="ident">span_error</span>, <span class="ident">error</span>, <span class="ident">Level</span>::<span class="ident">Error</span>);
<span class="macro">diagnostic_child_methods</span><span class="macro">!</span>(<span class="ident">span_warning</span>, <span class="ident">warning</span>, <span class="ident">Level</span>::<span class="ident">Warning</span>);
<span class="macro">diagnostic_child_methods</span><span class="macro">!</span>(<span class="ident">span_note</span>, <span class="ident">note</span>, <span class="ident">Level</span>::<span class="ident">Note</span>);
<span class="macro">diagnostic_child_methods</span><span class="macro">!</span>(<span class="ident">span_help</span>, <span class="ident">help</span>, <span class="ident">Level</span>::<span class="ident">Help</span>);
<span class="doccomment">/// Returns the diagnostic `level` for `self`.</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"proc_macro"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"38356"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">level</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Level</span> {
<span class="self">self</span>.<span class="ident">level</span>
}
<span class="doccomment">/// Emit the diagnostic.</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"proc_macro"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"38356"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">emit</span>(<span class="self">self</span>) {
::<span class="ident">__internal</span>::<span class="ident">with_sess</span>(<span class="kw">move</span> <span class="op">|</span>(<span class="ident">sess</span>, <span class="kw">_</span>)<span class="op">|</span> {
<span class="kw">let</span> <span class="ident">handler</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">sess</span>.<span class="ident">span_diagnostic</span>;
<span class="kw">let</span> <span class="ident">level</span> <span class="op">=</span> <span class="ident">__internal</span>::<span class="ident">level_to_internal_level</span>(<span class="self">self</span>.<span class="ident">level</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">diag</span> <span class="op">=</span> <span class="ident">rustc</span>::<span class="ident">DiagnosticBuilder</span>::<span class="ident">new</span>(<span class="ident">handler</span>, <span class="ident">level</span>, <span class="kw-2">&</span><span class="kw-2">*</span><span class="self">self</span>.<span class="ident">message</span>);
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">span</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">span</span> {
<span class="ident">diag</span>.<span class="ident">set_span</span>(<span class="ident">span</span>.<span class="number">0</span>);
}
<span class="kw">for</span> <span class="ident">child</span> <span class="kw">in</span> <span class="self">self</span>.<span class="ident">children</span> {
<span class="kw">let</span> <span class="ident">span</span> <span class="op">=</span> <span class="ident">child</span>.<span class="ident">span</span>.<span class="ident">map</span>(<span class="op">|</span><span class="ident">s</span><span class="op">|</span> <span class="ident">s</span>.<span class="number">0</span>);
<span class="kw">let</span> <span class="ident">level</span> <span class="op">=</span> <span class="ident">__internal</span>::<span class="ident">level_to_internal_level</span>(<span class="ident">child</span>.<span class="ident">level</span>);
<span class="ident">diag</span>.<span class="ident">sub</span>(<span class="ident">level</span>, <span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">child</span>.<span class="ident">message</span>, <span class="ident">span</span>);
}
<span class="ident">diag</span>.<span class="ident">emit</span>();
});
}
}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"proc_macro_internals"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"27812"</span>)]</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">__internal</span> {
<span class="kw">use</span> <span class="kw">super</span>::{<span class="ident">Level</span>, <span class="ident">rustc</span>};
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">level_to_internal_level</span>(<span class="ident">level</span>: <span class="ident">Level</span>) <span class="op">-></span> <span class="ident">rustc</span>::<span class="ident">Level</span> {
<span class="kw">match</span> <span class="ident">level</span> {
<span class="ident">Level</span>::<span class="ident">Error</span> <span class="op">=></span> <span class="ident">rustc</span>::<span class="ident">Level</span>::<span class="ident">Error</span>,
<span class="ident">Level</span>::<span class="ident">Warning</span> <span class="op">=></span> <span class="ident">rustc</span>::<span class="ident">Level</span>::<span class="ident">Warning</span>,
<span class="ident">Level</span>::<span class="ident">Note</span> <span class="op">=></span> <span class="ident">rustc</span>::<span class="ident">Level</span>::<span class="ident">Note</span>,
<span class="ident">Level</span>::<span class="ident">Help</span> <span class="op">=></span> <span class="ident">rustc</span>::<span class="ident">Level</span>::<span class="ident">Help</span>,
<span class="ident">Level</span>::<span class="ident">__Nonexhaustive</span> <span class="op">=></span> <span class="macro">unreachable</span><span class="macro">!</span>(<span class="string">"Level::__Nonexhaustive"</span>)
}
}
}
</pre>
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