[aiir, lsp] add folding range request

GitOrigin-RevId: 40ad30f2a30e3f2b197ba4ec4d038020e93758f6

fleet/lsp.protocol/srcCommonMain/com/jetbrains/lsp/protocol/FoldingRange.kt

@@ -0,0 +1,61 @@
+package com.jetbrains.lsp.protocol
+
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.builtins.ListSerializer
+import kotlinx.serialization.builtins.serializer
+
+@Serializable
+data class FoldingRangeParams(
+  val textDocument: TextDocumentIdentifier,
+  override val workDoneToken: ProgressToken? = null,
+  override val partialResultToken: ProgressToken? = null,
+) : WorkDoneProgressParams, PartialResultParams
+
+@Serializable
+data class FoldingRange(
+  /**
+   * The zero-based line number from where the folded range starts.
+   */
+  val startLine: Int,
+
+  /**
+   * The zero-based line number where the folded range ends.
+   */
+  val endLine: Int,
+
+  /**
+   * The zero-based character offset from where the folded range starts. If not defined, defaults
+   * to the length of the start line.
+   */
+  val startCharacter: Int? = null,
+
+  /**
+   * The zero-based character offset before the folded range ends. If not defined, defaults to the
+   * length of the end line.
+   */
+  val endCharacter: Int? = null,
+
+  /**
+   * Describes the kind of the folding range such as [FoldingRangeKind.Comment] or [FoldingRangeKind.Region].
+   * The kind is used to categorize folding ranges and used by commands like 'Fold all comments'.
+   * @see FoldingRangeKind
+   */
+  val kind: FoldingRangeKind? = null,
+
+  /**
+   * The text that the client should show when the specified range is
+   * collapsed. If not defined or not supported by the client, a default
+   * will be chosen by the client.
+   *
+   * @since 3.17.0
+   */
+  val collapsedText: String? = null
+)
+
+val FoldingRangeRequestType: RequestType<FoldingRangeParams, List<FoldingRange>, Unit> =
+  RequestType(
+    "textDocument/foldingRange",
+    FoldingRangeParams.serializer(),
+    ListSerializer(FoldingRange.serializer()),
+    Unit.serializer(),
+  )