[mlir][vscode] Highlight inside c++ raw strings

Within C++ raw strings with mlir delimitter use MLIR syntax.

Reviewed By: mehdi_amini

Differential Revision: https://reviews.llvm.org/D115963

mlir/utils/vscode/cpp-grammar.json

@@ -0,0 +1,44 @@
+{
+  "scopeName": "source.cpp.mlir",
+  "injectionSelector": "L:source.cpp",
+  "patterns": [
+    {
+      "include": "#mlir-raw-string"
+    }
+  ],
+  "repository": {
+    "mlir-raw-string": {
+      "begin": "R\"(?i:mlir)(\\()",
+      "beginCaptures": {
+        "0": {
+          "name": "punctuation.definition.string.begin.cpp"
+        },
+        "1": {
+          "name": "mlir.delimeter.raw.string.cpp"
+        }
+      },
+      "end": "\\)(?i:mlir)\"",
+      "endCaptures": {
+        "0": {
+          "name": "punctuation.definition.string.end.cpp"
+        },
+        "1": {
+          "name": "mlir.delimeter.raw.string.cpp"
+        }
+      },
+      "name": "mlir.raw.string.cpp",
+      "patterns": [
+        {
+          "contentName": "source.mlir",
+          "begin": "(?!\\G)",
+          "end": "(?i)(?=\\)mlir\")",
+          "patterns": [
+            {
+              "include": "source.mlir"
+            }
+          ]
+        }
+      ]
+    }
+  }
+}

mlir/utils/vscode/package.json

@@ -2,7 +2,7 @@
   "name": "vscode-mlir",
   "displayName": "MLIR",
   "description": "MLIR Language Extension",
-	"version": "0.0.2",
+  "version": "0.0.3",
   "publisher": "llvm-vs-code-extensions",
   "homepage": "https://mlir.llvm.org/",
   "icon": "icon.png",
@@ -80,6 +80,16 @@
         "embeddedLanguages": {
           "meta.embedded.block.mlir": "mlir"
         }
+      },
+      {
+        "scopeName": "source.cpp.mlir",
+        "path": "./cpp-grammar.json",
+        "injectTo": [
+          "source.cpp"
+        ],
+        "embeddedLanguages": {
+          "source.mlir": "mlir"
+        }
       }
     ],
     "configuration": {