fix: encloses enum values in quotes in JSON output

Ensures that enum values are properly serialized as strings within double quotes in the JSON output. This change adds quotes around enum names during serialization, resolving a formatting issue. Also adds test case for enum serialization.

Closes #361.

Author: plusvic

proto-json/src/lib.rs

@@ -253,7 +253,7 @@ impl<W: Write> Serializer<W> {
                 BASE64_STANDARD.encode(v).paint(self.colors.string)
             )?,
             ReflectValueRef::Enum(d, v) => match d.value_by_number(*v) {
-                Some(e) => write!(self.output, "{}", e.name())?,
+                Some(e) => write!(self.output, "\"{}\"", e.name())?,
                 None => write!(self.output, "{}", v)?,
             },
             ReflectValueRef::Message(msg) => self.write_msg(msg)?,

proto-json/src/tests/test.proto

@@ -20,4 +20,19 @@ message Message {
   repeated SubMessage repeated_msg = 8;
   optional SubMessage nested_msg = 9;
   optional int32 timestamp= 10 [(yara.field_options).fmt = "t"];
+  optional Enum enum = 11;
+  required uint32 flags = 12 [(yara.field_options).fmt = "flags:Flags"];
+
+}
+
+enum Enum {
+  Foo = 1;
+  Bar = 2;
 }
+
+enum Flags {
+  option (yara.enum_options).inline = true;
+  FOO = 0x1;
+  BAR = 0x2;
+  BAZ = 0x4;
+}

proto-json/src/tests/testdata/1.in

@@ -4,6 +4,8 @@ str: "foo"
 bool: true
 bytes: "\xCA\xFE"
 timestamp: 0
+enum: Foo
+flags: 3
 repeated_msg {
   i32: 456
   str: "bar\nbar"

proto-json/src/tests/testdata/1.out

@@ -25,5 +25,7 @@
             "foo": "bar"
         }
     },
-    "timestamp": { "encoding": "timestamp", "value": 0 }
+    "timestamp": { "encoding": "timestamp", "value": 0 },
+    "enum": "Foo",
+    "flags": 3
 }