65 lines
2.2 KiB
Swift
65 lines
2.2 KiB
Swift
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import Foundation
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public enum EditorActiveLineTracker {
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public static func lines(from source: String, activeLineIndex: Int) -> [EditorLine] {
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var lines: [EditorLine] = []
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var lineStart = source.startIndex
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var utf16Location = 0
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var index = 0
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while lineStart < source.endIndex {
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let lineEnd = source[lineStart...].firstIndex(of: "\n") ?? source.endIndex
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let line = String(source[lineStart..<lineEnd])
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let length = line.utf16.count
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lines.append(EditorLine(
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index: index,
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source: line,
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range: NSRange(location: utf16Location, length: length),
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mode: index == activeLineIndex ? .source : .rendered
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))
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if lineEnd == source.endIndex {
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lineStart = lineEnd
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utf16Location += length
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} else {
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lineStart = source.index(after: lineEnd)
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utf16Location += length + 1
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}
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index += 1
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}
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if source.isEmpty || source.hasSuffix("\n") {
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lines.append(EditorLine(
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index: index,
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source: "",
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range: NSRange(location: utf16Location, length: 0),
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mode: index == activeLineIndex ? .source : .rendered
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))
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}
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return lines
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}
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public static func lineIndex(containing location: Int, in source: String) -> Int {
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let clampedLocation = max(0, min(location, source.utf16.count))
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var currentLocation = 0
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for (index, line) in source.split(separator: "\n", omittingEmptySubsequences: false).enumerated() {
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let length = line.utf16.count
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if clampedLocation <= currentLocation + length {
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return index
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}
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currentLocation += length + 1
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}
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return 0
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}
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public static func clampedSelection(_ selection: EditorSelection, in source: String) -> EditorSelection {
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let sourceLength = source.utf16.count
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let location = max(0, min(selection.location, sourceLength))
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let length = max(0, min(selection.length, sourceLength - location))
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return EditorSelection(location: location, length: length)
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}
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}
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