enh(java) Add support for text block (#3322)

* enh(java) Add support for text block
* Add markup test for Java Text Block.

Author: teletha

CHANGES.md

@@ -14,12 +14,14 @@ Grammars:
 - fix(cpp) fix `xor_eq` keyword highlighting. [Denis Kovalchuk][]
 - enh(c,cpp) highlight type modifiers as type (#3316) [Josh Goebel][]
 - enh(css/less/stylus/scss) add support for CSS Grid properties [monochromer][]
+- enh(java) add support for Java Text Block (#3322) [Teletha][]
 - enh(scala) add missing `do` and `then` keyword (#3323) [Nicolas Stucki][]
 
 [Austin Schick]: https://github.com/austin-schick
 [Josh Goebel]: https://github.com/joshgoebel
 [Denis Kovalchuk]: https://github.com/deniskovalchuk
 [monochromer]: https://github.com/monochromer
+[Teletha]: https://github.com/teletha
 [Nicolas Stucki]: https://github.com/nicolasstucki
 
 

src/languages/java.js

@@ -160,6 +160,12 @@ export default function(hljs) {
       },
       hljs.C_LINE_COMMENT_MODE,
       hljs.C_BLOCK_COMMENT_MODE,
+      {
+        begin: /"""/,
+        end: /"""/,
+        className: "string",
+        contains: [hljs.BACKSLASH_ESCAPE]
+      },
       hljs.APOS_STRING_MODE,
       hljs.QUOTE_STRING_MODE,
       {

test/markup/java/textblock.expect.txt

@@ -0,0 +1,5 @@
+<span class="hljs-type">String</span> <span class="hljs-variable">json</span> <span class="hljs-operator">=</span> <span class="hljs-string">&quot;&quot;&quot;
+    {
+        &quot;key&quot;: &quot;value&quot;
+    }
+    &quot;&quot;&quot;</span>;

test/markup/java/textblock.txt

@@ -0,0 +1,5 @@
+String json = """
+    {
+        "key": "value"
+    }
+    """;