fix(rust) ensure brackets are balanced within attributes

CHANGES.md

@@ -26,6 +26,7 @@ Core Grammars:
 - enh(json) add json5 support [Kerry Shetline][]
 - fix(css) `unicode-range` parsing, issue #4253 [Kerry Shetline][]
 - fix(csharp) Support digit separators [te-ing][]
+- fix(rust) ensure brackets are balanced within attributes [ewwwin][]
 
 Documentation:
 
@@ -54,6 +55,7 @@ CONTRIBUTORS
 [Thomas Gorissen]: https://github.com/serrynaimo
 [te-ing]: https://github.com/te-ing
 [Anthony Martin]: https://github.com/anthony-c-martin
+[ewwwin]: https://github.com/ewwwin
 [NriotHrreion]: https://github.com/NriotHrreion
 
 

src/languages/rust.js

@@ -25,6 +25,12 @@ export default function(hljs) {
       IDENT_RE,
       regex.lookahead(/\s*\(/))
   };
+  const META_STRING = {
+    className: 'string',
+    begin: /"/,
+    end: /"/,
+    contains: [ hljs.BACKSLASH_ESCAPE ]
+  };
   const NUMBER_SUFFIX = '([ui](8|16|32|64|128|size)|f(32|64))\?';
   const KEYWORDS = [
     "abstract",
@@ -246,12 +252,26 @@ export default function(hljs) {
         begin: '#!?\\[',
         end: '\\]',
         contains: [
+          META_STRING,
           {
-            className: 'string',
-            begin: /"/,
-            end: /"/,
+            relevance: 0,
+            variants: [
+              {
+                begin: /\(/,
+                end: /\)/
+              },
+              {
+                begin: /\[/,
+                end: /\]/
+              },
+              {
+                begin: /\{/,
+                end: /\}/
+              }
+            ],
             contains: [
-              hljs.BACKSLASH_ESCAPE
+              'self',
+              META_STRING
             ]
           }
         ]

test/markup/rust/attributes.expect.txt

@@ -0,0 +1,18 @@
+<span class="hljs-meta">#[foo]</span>
+<span class="hljs-meta">#![foo]</span>
+
+<span class="hljs-meta">#[foo(bar)]</span>
+<span class="hljs-meta">#[foo = bar]</span>
+<span class="hljs-meta">#[foo(<span class="hljs-string">&quot;a \&quot;b\&quot; c&quot;</span>)]</span>
+<span class="hljs-meta">#[foo(bar = [a, b, c])]</span>
+<span class="hljs-meta">#[foo[bar]]</span>
+<span class="hljs-meta">#[foo{bar}]</span>
+
+<span class="hljs-meta">#![no_std]</span>
+<span class="hljs-meta">#[doc = <span class="hljs-string">&quot;example&quot;</span>]</span>
+<span class="hljs-meta">#[allow(unused, clippy::inline_always)]</span>
+<span class="hljs-meta">#[macro_use(foo, bar)]</span>
+<span class="hljs-meta">#[link(name = <span class="hljs-string">&quot;CoreFoundation&quot;</span>, kind = <span class="hljs-string">&quot;framework&quot;</span>)]</span>
+
+<span class="hljs-meta">#[rtic::app(device = lm3s6965, dispatchers = [UART0, UART1])]</span>
+<span class="hljs-meta">#[task(binds = USB_OTG1, local = [poller])]</span>

test/markup/rust/attributes.txt

@@ -0,0 +1,18 @@
+#[foo]
+#![foo]
+
+#[foo(bar)]
+#[foo = bar]
+#[foo("a \"b\" c")]
+#[foo(bar = [a, b, c])]
+#[foo[bar]]
+#[foo{bar}]
+
+#![no_std]
+#[doc = "example"]
+#[allow(unused, clippy::inline_always)]
+#[macro_use(foo, bar)]
+#[link(name = "CoreFoundation", kind = "framework")]
+
+#[rtic::app(device = lm3s6965, dispatchers = [UART0, UART1])]
+#[task(binds = USB_OTG1, local = [poller])]