Add seriailzation to json pointer

Author: OptimumCode

src/commonMain/kotlin/io/github/optimumcode/json/pointer/JsonPointer.kt

@@ -1,5 +1,6 @@
 package io.github.optimumcode.json.pointer
 
+import kotlinx.serialization.Serializable
 import kotlin.jvm.JvmField
 import kotlin.jvm.JvmStatic
 
@@ -13,6 +14,7 @@ public fun JsonPointer(path: String): JsonPointer = JsonPointer.compile(path)
  * Implementation of a JSON pointer described in the specification
  * [RFC6901](https://datatracker.ietf.org/doc/html/rfc6901).
  */
+@Serializable(JsonPointerSerializer::class)
 public sealed class JsonPointer(
   internal open val next: JsonPointer? = null,
 ) {

src/commonMain/kotlin/io/github/optimumcode/json/pointer/JsonPointerSerializer.kt

@@ -0,0 +1,25 @@
+package io.github.optimumcode.json.pointer
+
+import kotlinx.serialization.KSerializer
+import kotlinx.serialization.descriptors.PrimitiveKind
+import kotlinx.serialization.descriptors.PrimitiveSerialDescriptor
+import kotlinx.serialization.descriptors.SerialDescriptor
+import kotlinx.serialization.encoding.Decoder
+import kotlinx.serialization.encoding.Encoder
+
+public object JsonPointerSerializer : KSerializer<JsonPointer> {
+  override val descriptor: SerialDescriptor =
+    PrimitiveSerialDescriptor(
+      "io.github.optimumcode.json.pointer.JsonPointer",
+      PrimitiveKind.STRING,
+    )
+
+  override fun deserialize(decoder: Decoder): JsonPointer = JsonPointer(decoder.decodeString())
+
+  override fun serialize(
+    encoder: Encoder,
+    value: JsonPointer,
+  ) {
+    encoder.encodeString(value.toString())
+  }
+}

src/commonTest/kotlin/io/github/optimumcode/json/pointer/JsonPointerSerializationTest.kt

@@ -0,0 +1,25 @@
+package io.github.optimumcode.json.pointer
+
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.shouldBe
+import kotlinx.serialization.encodeToString
+import kotlinx.serialization.json.Json
+
+class JsonPointerSerializationTest : FunSpec() {
+  init {
+    listOf(
+      JsonPointer.ROOT to "",
+      JsonPointer("/test") to "/test",
+      JsonPointer("/te~0st") to "/te~0st",
+      JsonPointer("/te~1st") to "/te~1st",
+    ).forEach { (pointer, expected) ->
+      test("json pointer $pointer serialized") {
+        Json.encodeToString(pointer) shouldBe "\"$expected\""
+      }
+
+      test("json pointer $pointer deserialized") {
+        Json.decodeFromString(JsonPointer.serializer(), "\"$expected\"") shouldBe pointer
+      }
+    }
+  }
+}