NSRange intersections

Question

Answer · Accepted Answer

class IntersectionRange {
    let range1 : NSRange
    let range2 : NSRange
    
    init(first: NSRange, second: NSRange) {
        range1 = first
        range2 = second
    }
    
    func intersection() -> NSRange? {
        let min1 = range1.location
        let max1 = range1.location + range1.length
        
        let min2 = range2.location
        let max2 = range2.location + range2.length
        
        if max2 < min1 ||
            max1 < min2 {
            return nil
        }
        else {
            let minRange = max(min1, min2)
            let maxRange = min(max1, max2)
            
            return NSRange(location: minRange, length: maxRange - minRange)
        }
    }
}

let intersectionRange = IntersectionRange(first: NSRange(location: 5, length: 17),
                                          second: NSRange(location: 10, length: 3))
let intersection = intersectionRange.intersection()

Utilisateur anonyme · Answer

func rangeIntersections(_ range1: NSRange, _ range2: NSRange) -> NSRange {
    let maxLocation = max(range1.location, range2.location)
    let ranges: (maxLocation: NSRange, minLocation: NSRange) = maxLocation == range1.location ? (range1, range2) : (range2, range1)
    let point = ranges.minLocation.location + ranges.minLocation.length
    return NSMakeRange(maxLocation, point - maxLocation)
}

Terminator · Answer

func rangeInterSection(r1: NSRange, r2: NSRange) -> Bool {
    return (r1.location >= r2.location && r1.location = r1.location && r2.location <= (r1.location + r1.length))
}

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