Add uuid fromat validator (#78)

Related to #54

README.md

@@ -297,6 +297,7 @@ The library supports `format` assertion. For now only a few formats are supporte
 * relative-json-pointer
 * ipv4
 * ipv6
+* uuid
 
 But there is an API to implement the user's defined format validation.
 The [FormatValidator](src/commonMain/kotlin/io/github/optimumcode/json/schema/ValidationError.kt) interface can be user for that.

src/commonMain/kotlin/io/github/optimumcode/json/schema/internal/factories/general/FormatAssertionFactory.kt

@@ -21,6 +21,7 @@ import io.github.optimumcode.json.schema.internal.formats.IpV6FormatValidator
 import io.github.optimumcode.json.schema.internal.formats.JsonPointerFormatValidator
 import io.github.optimumcode.json.schema.internal.formats.RelativeJsonPointerFormatValidator
 import io.github.optimumcode.json.schema.internal.formats.TimeFormatValidator
+import io.github.optimumcode.json.schema.internal.formats.UuidFormatValidator
 import kotlinx.serialization.json.JsonElement
 import kotlinx.serialization.json.JsonPrimitive
 
@@ -66,6 +67,7 @@ internal sealed class FormatAssertionFactory(
         "relative-json-pointer" to RelativeJsonPointerFormatValidator,
         "ipv4" to IpV4FormatValidator,
         "ipv6" to IpV6FormatValidator,
+        "uuid" to UuidFormatValidator,
       )
   }
 }

src/commonMain/kotlin/io/github/optimumcode/json/schema/internal/formats/UuidFormatValidator.kt

@@ -0,0 +1,21 @@
+package io.github.optimumcode.json.schema.internal.formats
+
+import io.github.optimumcode.json.schema.FormatValidationResult
+import io.github.optimumcode.json.schema.FormatValidator
+
+internal object UuidFormatValidator : AbstractStringFormatValidator() {
+  private const val UUID_LENGTH = 36
+  private const val HEX = "[0-9a-fA-F]"
+  private val UUID_REGEX = Regex("$HEX{8}-$HEX{4}-$HEX{4}-$HEX{4}-$HEX{12}")
+
+  override fun validate(value: String): FormatValidationResult {
+    if (value.isEmpty() || value.length != UUID_LENGTH) {
+      return FormatValidator.Invalid()
+    }
+    return if (UUID_REGEX.matches(value)) {
+      FormatValidator.Valid()
+    } else {
+      FormatValidator.Invalid()
+    }
+  }
+}

src/commonTest/kotlin/io/github/optimumcode/json/schema/assertions/general/format/JsonSchemaUuidFormatValidationTest.kt

@@ -0,0 +1,24 @@
+package io.github.optimumcode.json.schema.assertions.general.format
+
+import io.kotest.core.spec.style.FunSpec
+
+class JsonSchemaUuidFormatValidationTest : FunSpec() {
+  init {
+    formatValidationTestSuite(
+      format = "uuid",
+      validTestCases =
+        listOf(
+          "f81d4fae-7dec-11d0-a765-00a0c91e6bf6",
+          "F81D4FAE-7DEC-11D0-A765-00A0C91E6BF6",
+        ),
+      invalidTestCases =
+        listOf(
+          TestCase("", "empty value"),
+          TestCase("f81d4fae-7dec-11d0-a765-00a0c91e6bf", "too short"),
+          TestCase("f81d4fae-7dec-11d0-a765-00a0c91e6bf64", "too long"),
+          TestCase("f81d4fae-7dec-11d0-a7865-00a0c91e6bf64", "wrong block length"),
+          TestCase("f81d4fae-7dec-11d0-g765-00a0c91e6bf6", "invalid character"),
+        ),
+    )
+  }
+}

test-suites/src/commonTest/kotlin/io/github/optimumcode/json/schema/suite/AbstractSchemaTestSuite.kt

@@ -56,7 +56,6 @@ internal val COMMON_FORMAT_FILTER =
         "uri" to emptySet(),
         "uri-reference" to emptySet(),
         "uri-template" to emptySet(),
-        "uuid" to emptySet(),
       ),
   )