fix: add classLiteral to the language for class diagram namespace

Author: kriss-u

.changeset/rare-women-fly.md

@@ -0,0 +1,5 @@
+---
+'mermaid': patch
+---
+
+fix: Add escaped class literal name on namespace

cypress/integration/rendering/classDiagram.spec.js

@@ -512,4 +512,17 @@ describe('Class diagram', () => {
       );
     });
   });
+
+  it('should handle backticks for namespace and class names', () => {
+    imgSnapshotTest(
+      `
+      classDiagram
+          namespace \`A::B\` {
+              class \`IPC::Sender\`
+          }
+          RenderProcessHost --|> \`IPC::Sender\`
+      `,
+      {}
+    );
+  });
 });

packages/mermaid/src/diagrams/class/parser/class.spec.js

@@ -15,4 +15,12 @@ describe('class diagram', function () {
       expect(() => parser.parse(`classDiagram\nnamespace ${prop} {\n\tclass A\n}`)).not.toThrow();
     });
   });
+
+  describe('backtick escaping', function () {
+    it('should handle backtick-quoted namespace names', function () {
+      expect(() =>
+        parser.parse(`classDiagram\nnamespace \`A::B\` {\n\tclass \`IPC::Sender\`\n}`)
+      ).not.toThrow();
+    });
+  });
 });

packages/mermaid/src/diagrams/class/parser/classDiagram.jison

@@ -242,6 +242,7 @@ classLabel
 
 namespaceName
     : alphaNumToken { $$=$1; }
+    | classLiteralName { $$=$1; }
     | alphaNumToken DOT namespaceName { $$=$1+'.'+$3; }
     | alphaNumToken namespaceName { $$=$1+$2; }
     ;