(Swift 2) A Simple Web Crawler

This demonstrates a very simple web crawler using the Chilkat Spider component.

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

func chilkatTest() {
    let spider = CkoSpider()

    let seenDomains = CkoStringArray()
    let seedUrls = CkoStringArray()

    seenDomains.Unique = true
    seedUrls.Unique = true

    // You will need to change the start URL to something else...
    seedUrls.Append("http://something.whateverYouWant.com/")

    // Set outbound URL exclude patterns
    // URLs matching any of these patterns will not be added to the 
    // collection of outbound links.
    spider.AddAvoidOutboundLinkPattern("*?id=*")
    spider.AddAvoidOutboundLinkPattern("*.mypages.*")
    spider.AddAvoidOutboundLinkPattern("*.personal.*")
    spider.AddAvoidOutboundLinkPattern("*.comcast.*")
    spider.AddAvoidOutboundLinkPattern("*.aol.*")
    spider.AddAvoidOutboundLinkPattern("*~*")

    // Use a cache so we don't have to re-fetch URLs previously fetched.
    spider.CacheDir = "c:/spiderCache/"
    spider.FetchFromCache = true
    spider.UpdateCache = true

    while seedUrls.Count.intValue > 0 {

        var url: String? = seedUrls.Pop()
        spider.Initialize(url)

        // Spider 5 URLs of this domain.
        // but first, save the base domain in seenDomains
        var domain: String? = spider.GetUrlDomain(url)
        seenDomains.Append(spider.GetBaseDomain(domain))

        var i: Int
        var success: Bool
        for i = 0; i <= 4; i++ {
            success = spider.CrawlNext()
            if success == true {

                // Display the URL we just crawled.
                print("\(spider.LastUrl)")

                // If the last URL was retrieved from cache,
                // we won't wait.  Otherwise we'll wait 1 second
                // before fetching the next URL.
                if spider.LastFromCache != true {
                    spider.SleepMs(1000)
                }

            }
            else {
                // cause the loop to exit..
                i = 999
            }

        }

        // Add the outbound links to seedUrls, except
        // for the domains we've already seen.
        for i = 0; i <= spider.NumOutboundLinks.intValue - 1; i++ {

            url = spider.GetOutboundLink(i)
            var domain: String? = spider.GetUrlDomain(url)
            var baseDomain: String? = spider.GetBaseDomain(domain)
            if seenDomains.Contains(baseDomain) == false {
                // Don't let our list of seedUrls grow too large.
                if seedUrls.Count.intValue < 1000 {
                    seedUrls.Append(url)
                }

            }

        }

    }


}