Add Pkl language support

Author: gibfahn

README.md

@@ -487,6 +487,7 @@ Perl6
 Pest
 Phix
 Php
+Pkl
 Po
 Poke
 Polly

languages.json

@@ -1288,6 +1288,16 @@
       "quotes": [["\\\"", "\\\""], ["'", "'"]],
       "extensions": ["php"]
     },
+    "Pkl": {
+      "line_comment": ["//", "///"],
+      "filenames": [
+          "pklproject"
+      ],
+      "extensions": ["pkl"],
+      "multi_line_comments": [["/*", "*/"]],
+      "quotes": [["\\\"\\\"\\\"", "\\\"\\\"\\\""]],
+      "verbatim_quotes": [["r##\\\"", "\\\"##"], ["r#\\\"", "\\\"#"]]
+    },
     "PlantUml": {
       "name": "PlantUML",
       "line_comment": ["'"],

tests/data/pkl.pkl

@@ -0,0 +1,32 @@
+// 32 lines 14 code 11 comments 7 blanks
+/// Doc comments
+/// not_a_real = "assignment"
+/// Pkl docs: <https://pkl-lang.org>
+module example.MyAppConfig
+
+/* Multiline comment on one line */
+local function myFunction() = new {
+    string = """
+      Everything in here is a string.
+      /* not a comment */
+      // not a comment
+      """
+
+    other = #"Everything in here is a string. Quotes like " don't start a new string "#
+
+    // comment
+
+    a = 4 // /*
+    b = 5
+    c = 6 // */
+
+    /*
+    * Multiline comment on multiple lines
+    */
+}
+
+/// The hostname for the application
+host: String = "foo"
+
+/// The port to listen on
+port: UInt16(this > 1000) = 1001