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(Swift) 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.integerValue > 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.integerValue - 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.integerValue < 1000 {
                    seedUrls.Append(url)
                }

            }

        }

    }


}

 

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