Zig

Must-Match Patterns

See more Spider Examples

You may restrict the spider to only follow links that match any one of a set of "must-match" wildcard patterns. The AddMustMatchPattern can be called repeatedly to add must-match patterns. Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    const spider = try chilkat.Spider.init();
    defer spider.deinit();

    // --------------------------------------------------------------------
    // Note: The URLs in this example are no longer valid.
    // You should replace the URLs with URLs from a site of your
    // own choosing -- preferably your own site if testing.
    // (Google's Directory no longer exists.)
    // --------------------------------------------------------------------

    // First, we'll get the outbound links for a page in the
    // Google directory.  Then we'll add some must-match
    // and then re-fetch, to see it work...

    spider.initialize("directory.google.com");
    spider.addUnspidered("http://directory.google.com/Top/Recreation/Outdoors/Hiking/Backpacking/");

    try spider.crawlNext();

    // Display the outbound links
    var i: i32 = 0;
    i = 0;
    while (i < spider.getNumOutboundLinks()) : (i += 1) {
        std.debug.print("{s}\n", .{try spider.getOutboundLink(alloc, i)});
    }

    // The output:
    // http://www.backpacker.com
    // http://www.cmc.org
    // http://www.backpacking.net
    // http://www.thebackpacker.com/
    // http://www.rei.com/online/store/LearnShareArticlesList?categoryId=Camping
    // http://www.trailspace.com/
    // http://www.catskillhikes.com/
    // http://gorp.away.com/gorp/location/asia/nepal/favpicks.htm
    // http://www.backpackinglight.com/cgi-bin/backpackinglight/index.html
    // http://www.yetizone.com/
    // http://www.backpackingfun.com
    // http://www.freezerbagcooking.com/
    // http://www.spadout.com/backpacking/
    // http://sierrabackpacker.com
    // http://www.abovecalifornia.com/
    // http://www.personal.psu.edu/faculty/r/p/rpc1/bbb/
    // http://www.thebackpackersguide.com
    // http://www.journeywest.com/WB/index.html
    // http://www.johann-sandra.com/backpackdir.htm
    // http://www.geocities.com/amytys/
    // http://www.cloudwalkersbasecamp.com
    // http://www.netbackpacking.com
    // http://members.tripod.com/~stooges/
    // http://www.thebackpackingsite.com
    // http://www.thruhikers.com/
    // http://www.redcompservices.com/AT/
    // http://members.aol.com/CMorHiker/backpack
    // http://mywebpages.comcast.net/midwestpacker/
    // http://www.midwesthiker.com/
    // http://www.WeBackpack.com
    // http://www.michiganhiker.com
    // http://www.host33.com/backpack/
    // http://www.wilderness-backpacking.com
    // http://www.thetravelmonkey.net
    // http://dmoz.org/cgi-bin/add.cgi?where=Recreation/Outdoors/Hiking/Backpacking
    // http://dmoz.org/about.html
    // http://dmoz.org/cgi-bin/apply.cgi?where=Recreation/Outdoors/Hiking/Backpacking
    // http://dmoz.org
    // http://dmoz.org/profiles/cdog.html
    // http://dmoz.org/profiles/justinwp.html

    // Do it again, but this time with avoid patterns.
    spider.initialize("directory.google.com");
    spider.addUnspidered("http://directory.google.com/Top/Recreation/Outdoors/Hiking/Backpacking/");

    // Add some must-match patterns:
    spider.addMustMatchPattern("*.com/*");
    spider.addMustMatchPattern("*.net/*");

    // Add some avoid-patterns:
    spider.addAvoidOutboundLinkPattern("*.mypages.*");
    spider.addAvoidOutboundLinkPattern("*.personal.*");
    spider.addAvoidOutboundLinkPattern("*.comcast.*");
    spider.addAvoidOutboundLinkPattern("*.aol.*");
    spider.addAvoidOutboundLinkPattern("*~*");

    try spider.crawlNext();

    std.debug.print("-----------------------\n", .{});

    // Display the outbound links
    i = 0;
    while (i < spider.getNumOutboundLinks()) : (i += 1) {
        std.debug.print("{s}\n", .{try spider.getOutboundLink(alloc, i)});
    }

    // Output:
    // http://www.thebackpacker.com/
    // http://www.rei.com/online/store/LearnShareArticlesList?categoryId=Camping
    // http://www.trailspace.com/
    // http://www.catskillhikes.com/
    // http://gorp.away.com/gorp/location/asia/nepal/favpicks.htm
    // http://www.backpackinglight.com/cgi-bin/backpackinglight/index.html
    // http://www.yetizone.com/
    // http://www.freezerbagcooking.com/
    // http://www.spadout.com/backpacking/
    // http://www.abovecalifornia.com/
    // http://www.journeywest.com/WB/index.html
    // http://www.johann-sandra.com/backpackdir.htm
    // http://www.geocities.com/amytys/
    // http://www.thruhikers.com/
    // http://www.redcompservices.com/AT/
    // http://www.midwesthiker.com/
    // http://www.host33.com/backpack/
}