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Insert XML into existing XML by calling InsertChildTreeAfter

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Demonstrates how to insert an XML tree or subtree into another XML document using the InsertChildTreeAfter method. Zig

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

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

    // Build the 1st XML document:
    // <x1>
    //     <a1>1</a1>
    //     <a2>2</a2>
    //     <a3>3</a3>
    // </x1>

    const xml = try chilkat.Xml.init();
    defer xml.deinit();
    xml.setTag("x1");
    xml.updateChildContent("a1", "1");
    xml.updateChildContent("a2", "2");
    xml.updateChildContent("a3", "3");

    // Build a 2nd XML document:

    // <x2>
    //   <b1>11</b1>
    //   <b2>22</b2>
    //   <b3>33</b3>
    // </x2>

    const xml2 = try chilkat.Xml.init();
    defer xml2.deinit();
    xml2.setTag("x2");
    xml2.updateChildContent("b1", "11");
    xml2.updateChildContent("b2", "22");
    xml2.updateChildContent("b3", "33");

    // We want to insert xml2 into xml to get this:

    // <x1>
    //     <a1>1</a1>
    //     <x2>
    //         <b1>11</b1>
    //         <b2>22</b2>
    //         <b3>33</b3>
    //     </x2>
    //     <a2>2</a2>
    //     <a3>3</a3>
    // </x1>

    // Insert xml2 after "a1"

    const index = xml.tagIndex("a1");
    if (index < 0) {
        std.debug.print("a1 not found.\n", .{});
        return;
    }

    xml.insertChildTreeAfter(index, xml2);

    std.debug.print("{s}\n", .{try xml.getXml(alloc)});

    // The result is:

    // <x1>
    //     <a1>1</a1>
    //     <x2>
    //         <b1>11</b1>
    //         <b2>22</b2>
    //         <b3>33</b3>
    //     </x2>
    //     <a2>2</a2>
    //     <a3>3</a3>
    // </x1>

    // Note: xml2 now points to the subtree within xml.
    // For example, update "b3" and then see how it's updated within the merged document:
    xml2.updateChildContent("b3", "33333333");

    std.debug.print("{s}\n", .{try xml.getXml(alloc)});

    // The result:

    // <x1>
    //     <a1>1</a1>
    //     <x2>
    //         <b1>11</b1>
    //         <b2>22</b2>
    //         <b3>33333333</b3>
    //     </x2>
    //     <a2>2</a2>
    //     <a3>3</a3>
    // </x1>
}