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1// SPDX-FileCopyrightText: 2025 The Project Pterodactyl Developers
2//
3// SPDX-License-Identifier: MPL-2.0
4
5import Algorithms
6import Foundation
7
8public struct LineMap: Codable {
9 private var utf16LineOffsets: [Int] = [0]
10
11 public init(source: String) {
12 for idx in source.indices {
13 let c = source[idx]
14 if c == "\n" || c == "\r\n" || c == "\r" {
15 let next = source.index(after: idx)
16 let utf16Offset = next.utf16Offset(in: source)
17 utf16LineOffsets.append(utf16Offset)
18 }
19 }
20 }
21
22 public func location(at utf16Offset: Int) -> (line: Int, column: Int) {
23 let partitioningIndex = utf16LineOffsets.partitioningIndex { $0 > utf16Offset }
24 let lineIndex = partitioningIndex == 0 ? 0 : partitioningIndex - 1
25 let lineStart = utf16LineOffsets[lineIndex]
26 let lineNumber = lineIndex + 1
27 let columnNumber = utf16Offset - lineStart + 1
28 return (lineNumber, columnNumber)
29 }
30}