Zig

XML Tree Traversal Order for Search* Methods

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The Chilkat XML API provides a number of Search* methods for locating XML nodes based on criteria. These methods traverse an XML document in a breadth-first order. (See Breadth-First Search).

The XML document used in this example has the following tree structure:

The nodes are traversed in the order: A, B, C, D, E, F, G, H, I, J, K.

The input XML, available at http://www.chilkatsoft.com/data/searchOrder.xml, is this:

<a>crocodileA
    <b>crocodileB
        <d>crocodileD</d>
        <e>crocodileE
            <h>crocodileH</h>
            <i>crocodileI</i>
        </e>
    </b>
    <c>crocodileC
        <f>crocodileF</f>
        <g>crocodileG
            <j>crocodileJ</j>
            <k>crocodileK</k>
        </g>
    </c>
</a>

Zig

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

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

    const xml = try chilkat.Xml.init();
    defer xml.deinit();

    // The sample input XML is available at http://www.chilkatsoft.com/data/searchOrder.xml
    xml.loadXmlFile("searchOrder.xml") catch {
        std.debug.print("{s}\n", .{try xml.getLastErrorText(alloc)});
        return;
    };

    // IMPORTANT:  The following loop for iterating over all
    // matching nodes performs reasonably well for small to
    // mid-size XML documents or sub-trees.  Performance
    // can be poor when the sub-tree contains many thousands
    // of nodes (or more).

    // NOTE:  The search is always rooted at the calling node.
    // In this example, it happens to also be the root node of the entire
    // XML document.  Searches can be performed on sub-trees
    // within the document by calling the Search* method from
    // the root node of a sub-tree.

    // Demonstrate the breadth-first traversal:
    var x_begin_after: chilkat.Xml = try xml.getSelf();
    defer x_begin_after.deinit();
    var x_found: chilkat.Xml = try xml.searchAllForContent(x_begin_after, "*croc*");
    defer x_found.deinit();
    while (xml.getLastMethodSuccess()) {
        std.debug.print("{s}\n", .{try x_found.getTag(alloc)});

        x_begin_after = x_found;
        {
            const next = try xml.searchAllForContent(x_begin_after, "*croc*");
            x_found.deinit();
            x_found = next;
        }
    }
}