Add default values for parameters

2 files changed, 21 insertions, 2 deletions

diff --git a/core/src/main/kotlin/model/defaultValues.kt b/core/src/main/kotlin/model/defaultValues.kt
new file mode 100644
index 00000000..63b69cbb
--- /dev/null
+++ b/core/src/main/kotlin/model/defaultValues.kt
@@ -0,0 +1,18 @@
+package org.jetbrains.dokka.model
+
+import org.jetbrains.dokka.model.properties.ExtraProperty
+import org.jetbrains.dokka.model.properties.MergeStrategy
+import java.lang.IllegalStateException
+
+class DefaultValue(val value: String): ExtraProperty<DParameter> {
+    companion object : ExtraProperty.Key<DParameter, DefaultValue> {
+        override fun mergeStrategyFor(left: DefaultValue, right: DefaultValue): MergeStrategy<DParameter> = if (left.value == right.value)
+            MergeStrategy.Replace(left)
+        else
+            MergeStrategy.Fail {throw IllegalStateException("Default values need to be the same")}
+
+    }
+
+    override val key: ExtraProperty.Key<DParameter, *>
+        get() = Companion
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/model/properties/PropertyContainer.kt b/core/src/main/kotlin/model/properties/PropertyContainer.kt
index 5ea42e42..107bede5 100644
--- a/core/src/main/kotlin/model/properties/PropertyContainer.kt
+++ b/core/src/main/kotlin/model/properties/PropertyContainer.kt
@@ -15,12 +15,13 @@ class PropertyContainer<C : Any> internal constructor(
     }
 
     inline fun <reified T : Any> allOfType(): List<T> = map.values.filterIsInstance<T>()
-    fun <D : C> addAll(vararg extras: ExtraProperty<D>): PropertyContainer<D> =
+    fun <D : C> addAll(extras: Collection<ExtraProperty<D>>): PropertyContainer<D> =
         PropertyContainer(map + extras.map { p -> p.key to p })
 
     companion object {
         fun <T : Any> empty(): PropertyContainer<T> = PropertyContainer(emptyMap())
-        fun <T : Any> withAll(vararg extras: ExtraProperty<T>) = empty<T>().addAll(*extras)
+        fun <T : Any> withAll(vararg extras: ExtraProperty<T>) = empty<T>().addAll(extras.toList())
+        fun <T : Any> withAll(extras: Collection<ExtraProperty<T>>) = empty<T>().addAll(extras)
     }
 }