[FIR-IDE] Add conversion for Map type

idea/idea-frontend-fir/idea-frontend-fir-generator/src/org/jetbrains/kotlin/idea/frontend/api/fir/generator/HLDiagnosticConverter.kt

@@ -98,14 +98,32 @@ private object FirToKtConversionCreator {
         return null
     }
 
+    private fun KType.toParameterName(): String {
+        return kClass.simpleName!!.replaceFirstChar(Char::lowercaseChar)
+    }
+
     private fun tryMapPlatformType(type: KType, kClass: KClass<*>): HLParameterConversion? {
         if (kClass.isSubclassOf(Collection::class)) {
             val elementType = type.arguments.single().type ?: return HLIdParameterConversion
-            return HLMapParameterConversion(
+            return HLCollectionParameterConversion(
-                parameterName = elementType.kClass.simpleName!!.replaceFirstChar(Char::lowercaseChar),
+                parameterName = elementType.toParameterName(),
                 mappingConversion = createConversion(elementType)
             )
         }
+        if (kClass.isSubclassOf(Map::class)) {
+            val keyType = type.arguments.getOrNull(0)?.type
+            val valueType = type.arguments.getOrNull(1)?.type
+
+            val keyConversion = keyType?.let { createConversion(it) } ?: HLIdParameterConversion
+            val valueConversion = valueType?.let { createConversion(it) } ?: HLIdParameterConversion
+            if (keyConversion.isTrivial && valueConversion.isTrivial) return HLIdParameterConversion
+            return HLMapParameterConversion(
+                keyName = keyType?.toParameterName() ?: "key",
+                valueName = valueType?.toParameterName() ?: "value",
+                mappingConversionForKeys = keyConversion,
+                mappingConversionForValues = valueConversion
+            )
+        }
         if (kClass.isSubclassOf(Pair::class)) {
             val first = type.arguments.getOrNull(0)?.type ?: return HLIdParameterConversion
             val second = type.arguments.getOrNull(1)?.type ?: return HLIdParameterConversion

idea/idea-frontend-fir/idea-frontend-fir-generator/src/org/jetbrains/kotlin/idea/frontend/api/fir/generator/HLParameterConversion.kt

@@ -21,7 +21,7 @@ object HLIdParameterConversion : HLParameterConversion() {
     override fun convertType(type: KType): KType = type
 }
 
-class HLMapParameterConversion(
+class HLCollectionParameterConversion(
     private val parameterName: String,
     private val mappingConversion: HLParameterConversion,
 ) : HLParameterConversion() {
@@ -47,6 +47,45 @@ class HLMapParameterConversion(
     override val importsToAdd get() = mappingConversion.importsToAdd
 }
 
+class HLMapParameterConversion(
+    private val keyName: String,
+    private val valueName: String,
+    private val mappingConversionForKeys: HLParameterConversion,
+    private val mappingConversionForValues: HLParameterConversion,
+) : HLParameterConversion() {
+    override fun convertExpression(expression: String, context: ConversionContext): String {
+        val keyTransformation = mappingConversionForKeys.convertExpression(keyName, context.increaseIndent())
+        val valueTransformation = mappingConversionForValues.convertExpression(valueName, context.increaseIndent())
+        return buildString {
+            appendLine("$expression.mapKeys { ($keyName, _) ->")
+            appendLine(keyTransformation.withIndent(context.increaseIndent()))
+            appendLine("}.mapValues { (_, $valueName) -> ".withIndent(context))
+            appendLine(valueTransformation.withIndent(context.increaseIndent()))
+            append("}".withIndent(context))
+        }
+    }
+
+    override fun convertType(type: KType): KType {
+        val keyArgument = type.arguments[0]
+        val valueArgument = type.arguments[1]
+        return Map::class.createType(
+            arguments = listOf(
+                KTypeProjection(
+                    variance = KVariance.INVARIANT,
+                    type = keyArgument.type?.let(mappingConversionForKeys::convertType)
+                ),
+                KTypeProjection(
+                    variance = KVariance.INVARIANT,
+                    type = valueArgument.type?.let(mappingConversionForValues::convertType)
+                )
+            )
+        )
+    }
+
+    override val importsToAdd: List<String>
+        get() = (mappingConversionForKeys.importsToAdd + mappingConversionForValues.importsToAdd).distinct()
+}
+
 class HLPairParameterConversion(
     private val mappingConversionFirst: HLParameterConversion,
     private val mappingConversionSecond: HLParameterConversion,
@@ -93,3 +132,6 @@ private fun String.withIndent(context: ConversionContext): String {
     val newIndent = " ".repeat(context.currentIndent * context.indentUnitValue)
     return replaceIndent(newIndent)
 }
+
+val HLParameterConversion.isTrivial: Boolean
+    get() = this is HLIdParameterConversion