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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, Sendable {
9 private let utf16LineOffsets: [Int]
10
11 public init(source: String) {
12 var offsets: [Int] = [0]
13 for idx in source.indices {
14 let c = source[idx]
15 if c == "\n" || c == "\r\n" || c == "\r" {
16 let next = source.index(after: idx)
17 let utf16Offset = next.utf16Offset(in: source)
18 offsets.append(utf16Offset)
19 }
20 }
21 self.utf16LineOffsets = offsets
22 }
23
24 public func location(at utf16Offset: Int) -> (line: Int, column: Int) {
25 let partitioningIndex = utf16LineOffsets.partitioningIndex { $0 > utf16Offset }
26 let lineIndex = partitioningIndex == 0 ? 0 : partitioningIndex - 1
27 let lineStart = utf16LineOffsets[lineIndex]
28 let lineNumber = lineIndex
29 let columnNumber = utf16Offset - lineStart
30 return (lineNumber, columnNumber)
31 }
32}