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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2023 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
/// Finds all marked ranges in the given text, see `Marker`.
fileprivate func findMarkedRanges(text: String) -> [Marker] {
var markers = [Marker]()
while let marker = nextMarkedRange(text: text, from: markers.last?.range.upperBound ?? text.startIndex) {
markers.append(marker)
}
return markers
}
extension Character {
var isMarkerEmoji: Bool {
switch self {
case "0️⃣", "1️⃣", "2️⃣", "3️⃣", "4️⃣", "5️⃣", "6️⃣", "7️⃣", "8️⃣", "9️⃣", "🔟", "ℹ️":
return true
default: return false
}
}
}
fileprivate func nextMarkedRange(text: String, from: String.Index) -> Marker? {
guard let start = text[from...].firstIndex(where: { $0.isMarkerEmoji }) else {
return nil
}
let end = text.index(after: start)
let markerRange = start..<end
let name = text[start..<end]
return Marker(name: name, range: markerRange)
}
fileprivate struct Marker {
/// The name of the marker.
let name: Substring
/// The range of the marker.
///
/// If the marker contains all the non-whitespace characters on the line,
/// this is the range of the entire line. Otherwise it's the range of the
/// marker itself.
let range: Range<String.Index>
}
public func extractMarkers(_ markedText: String) -> (markers: [String: Int], textWithoutMarkers: String) {
var text = ""
var markers = [String: Int]()
var lastIndex = markedText.startIndex
for marker in findMarkedRanges(text: markedText) {
text += markedText[lastIndex..<marker.range.lowerBound]
lastIndex = marker.range.upperBound
assert(markers[String(marker.name)] == nil, "Marker names must be unique")
markers[String(marker.name)] = text.utf8.count
}
text += markedText[lastIndex..<markedText.endIndex]
return (markers, text)
}
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