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1// SPDX-FileCopyrightText: 2025 The Project Pterodactyl Developers
2//
3// SPDX-License-Identifier: MPL-2.0
4
5import Foundation
6import LanguageServerProtocol
7
8private enum ArraySymmetry {
9 case identity
10 case reverse
11}
12
13extension Array {
14 fileprivate func apply(symmetry: ArraySymmetry) -> any Collection<Element> {
15 switch symmetry {
16 case .identity: self
17 case .reverse: reversed()
18 }
19 }
20}
21
22extension SyntaxTree.Cursor {
23 private func firstVisibleNode(under symmetry: ArraySymmetry) -> SyntaxTree.Cursor? {
24 switch node {
25 case .token(let token, _):
26 return token.kind.isVisible ? self : nil
27 case .tree:
28 for child in children.apply(symmetry: symmetry) {
29 if let visibleChild = child.firstVisibleNode(under: symmetry) { return visibleChild }
30 continue
31 }
32
33 return nil
34 }
35 }
36
37 private var visibleUtf16Range: Range<Int>? {
38 guard
39 let firstNode = firstVisibleNode(under: .identity),
40 let lastNode = firstVisibleNode(under: .reverse)
41 else { return nil }
42 return firstNode.utf16Range.lowerBound..<lastNode.utf16Range.upperBound
43 }
44
45 private func collectFoldingRanges(_ sink: inout [FoldingRange]) {
46 if let foldingRangeKind = node.tree?.metadata?.delimitedFoldingRangeKind, let visibleUtf16Range {
47 let startLocation = lineMap.location(at: visibleUtf16Range.lowerBound)
48 let endLocation = lineMap.location(at: visibleUtf16Range.upperBound)
49 let foldingRange = FoldingRange(startLine: startLocation.line, endLine: endLocation.line, kind: foldingRangeKind)
50 sink.append(foldingRange)
51 }
52
53 for child in children {
54 child.collectFoldingRanges(&sink)
55 }
56 }
57
58 public var foldingRanges: [FoldingRange] {
59 var sink: [FoldingRange] = []
60 collectFoldingRanges(&sink)
61 return sink
62 }
63}