#include <fstream>
#include <iostream>

#include "pugixml.hpp"

using namespace std;
using namespace pugi;

int main()
{
    // Several ways to get XML document

    {
        // Load from string
        xml_document doc;

        cout << doc.load("<sample-xml>some text <b>in bold</b> here</sample-xml>") << endl;
    }

    {
        // Load from file
        xml_document doc;

        cout << doc.load_file("sample.xml") << endl;
    }

    {
        // Load from any input stream (STL)
        xml_document doc;

        std::ifstream in("sample.xml");
        cout << doc.load(in) << endl;
    }

    {
        // More advanced: parse the specified string without duplicating it
        xml_document doc;

        char* s = new char[100];
        strcpy(s, "<sample-xml>some text <b>in bold</b> here</sample-xml>");
        cout << doc.parse(transfer_ownership_tag(), s) << endl;
    }

    {
        // Even more advanced: assume manual lifetime control
        xml_document doc;

        char* s = new char[100];
        strcpy(s, "<sample-xml>some text <b>in bold</b> here</sample-xml>");
        cout << doc.parse(s) << endl;

        delete[] s; // <-- after this point, all string contents of document is invalid!
    }

    {
        // Or just create document from code?
        xml_document doc;

        // add nodes to document (see next samples)
    }
}

#include <iostream>

#include "pugixml.hpp"

using namespace std;
using namespace pugi;

struct bookstore_traverser: public xml_tree_walker
{
    virtual bool for_each(xml_node& n)
    {
        for (int i = 0; i < depth(); ++i) cout << "  "; // indentation

        if (n.type() == node_element) cout << n.name() << endl;
        else cout << n.value() << endl;

        return true; // continue traversal
    }
};

int main()
{
    xml_document doc;
    doc.load("<bookstore><book title='ShaderX'><price>3</price></book><book title='GPU Gems'><price>4</price></book></bookstore>");

    // If you want to iterate through nodes...

    {
        // Get a bookstore node
        xml_node bookstore = doc.child("bookstore");

        // Iterate through books
        for (xml_node book = bookstore.child("book"); book; book = book.next_sibling("book"))
        {
            cout << "Book " << book.attribute("title").value() << ", price " << book.child("price").first_child().value() << endl;
        }

        // Output:
        // Book ShaderX, price 3
        // Book GPU Gems, price 4
    }

    {
        // Alternative way to get a bookstore node (wildcards)
        xml_node bookstore = doc.child_w("*[sS]tore"); // this will select bookstore, anyStore, Store, etc.

        // Iterate through books with STL compatible iterators
        for (xml_node::iterator it = bookstore.begin(); it != bookstore.end(); ++it)
        {
            // Note the use of helper function child_value()
            cout << "Book " << it->attribute("title").value() << ", price " << it->child_value("price") << endl;
        }
        
        // Output:
        // Book ShaderX, price 3
        // Book GPU Gems, price 4
    }

    {
        // You can also traverse the whole tree (or a subtree)
        bookstore_traverser t;

        doc.traverse(t);
        
        // Output:
        // bookstore
        //   book
        //     price
        //       3
        //   book
        //     price
        //       4

        doc.first_child().traverse(t);

        // Output:
        // book
        //   price
        //     3
        // book
        //   price
        //     4
    }

    // If you want a distinct node...

    {
        // You can specify the way to it through child() functions
        cout << doc.child("bookstore").child("book").next_sibling().attribute("title").value() << endl;

        // Output:
        // GPU Gems
    
        // You can use a sometimes convenient path function
        cout << doc.first_element_by_path("bookstore/book/price").child_value() << endl;
        
        // Output:
        // 3

        // And you can use powerful XPath expressions
        cout << doc.select_single_node("/bookstore/book[@title = 'ShaderX']/price").node().child_value() << endl;
        
        // Output:
        // 3

        // Of course, XPath is much more powerful

        // Compile query that prints total price of all Gems book in store
        xpath_query query("sum(/bookstore/book[contains(@title, 'Gems')]/price)");

        cout << query.evaluate_number(doc) << endl;

        // Output:
        // 4

        // You can apply the same XPath query to any document. For example, let's add another Gems
        // book (more detail about modifying tree in next sample):
        xml_node book = doc.child("bookstore").append_child();
        book.set_name("book");
        book.append_attribute("title") = "Game Programming Gems 2";
        
        xml_node price = book.append_child();
        price.set_name("price");

        xml_node price_text = price.append_child(node_pcdata);
        price_text.set_value("5.3");
    
        // Now let's reevaluate query
        cout << query.evaluate_number(doc) << endl;

        // Output:
        // 9.3
    }
}

#include <iostream>

#include "pugixml.hpp"

using namespace std;
using namespace pugi;

int main()
{
    // For this example, we'll start with an empty document and create nodes in it from code
    xml_document doc;

    // Append several children and set values/names at once
    doc.append_child(node_comment).set_value("This is a test comment");
    doc.append_child().set_name("application");

    // Let's add a few modules
    xml_node application = doc.child("application");

    // Save node wrapper for convenience
    xml_node module_a = application.append_child();
    module_a.set_name("module");
    
    // Add an attribute, immediately setting it's value
    module_a.append_attribute("name").set_value("A");

    // You can use operator=
    module_a.append_attribute("folder") = "/work/app/module_a";

    // Or even assign numbers
    module_a.append_attribute("status") = 85.4;

    // Let's add another module
    xml_node module_c = application.append_child();
    module_c.set_name("module");
    module_c.append_attribute("name") = "C";
    module_c.append_attribute("folder") = "/work/app/module_c";

    // Oh, we missed module B. Not a problem, let's insert it before module C
    xml_node module_b = application.insert_child_before(node_element, module_c);
    module_b.set_name("module");
    module_b.append_attribute("folder") = "/work/app/module_b";

    // We can do the same thing for attributes
    module_b.insert_attribute_before("name", module_b.attribute("folder")) = "B";
    
    // Let's add some text in module A
    module_a.append_child(node_pcdata).set_value("Module A description");

    // Well, there's not much left to do here. Let's output our document to file using several formatting options

    doc.save_file("sample_saved_1.xml");
    
    // Contents of file sample_saved_1.xml (tab size = 4):
    // <?xml version="1.0"?>
    // <!--This is a test comment-->
    // <application>
    //     <module name="A" folder="/work/app/module_a" status="85.4">Module A description</module>
    //     <module name="B" folder="/work/app/module_b" />
    //     <module name="C" folder="/work/app/module_c" />
    // </application>

    // Let's use two spaces for indentation instead of tab character
    doc.save_file("sample_saved_2.xml", "  ");

    // Contents of file sample_saved_2.xml:
    // <?xml version="1.0"?>
    // <!--This is a test comment-->
    // <application>
    //   <module name="A" folder="/work/app/module_a" status="85.4">Module A description</module>
    //   <module name="B" folder="/work/app/module_b" />
    //   <module name="C" folder="/work/app/module_c" />
    // </application>
    
    // Let's save a raw XML file
    doc.save_file("sample_saved_3.xml", "", format_raw);
    
    // Contents of file sample_saved_3.xml:
    // <?xml version="1.0"?><!--This is a test comment--><application><module name="A" folder="/work/app/module_a" status="85.4">Module A description</module><module name="B" folder="/work/app/module_b" /><module name="C" folder="/work/app/module_c" /></application>

    // Finally, you can print a subtree to any output stream (including cout)
    xml_writer_stream writer(cout);
    doc.child("application").child("module").print(writer);

    // Output:
    // <module name="A" folder="/work/app/module_a" status="85.4">Module A description</module>
}