pugixml/docs/samples/include.cpp

#include "pugixml.hpp"

#include <string.h>
#include <iostream>

//[code_include
bool load_preprocess(pugi::xml_document& doc, const char* path);

bool preprocess(pugi::xml_node node)
{
	for (pugi::xml_node child = node.first_child(); child; )
	{
		if (child.type() == pugi::node_pi && strcmp(child.name(), "include") == 0)
		{
			pugi::xml_node include = child;

			// load new preprocessed document (note: ideally this should handle relative paths)
			const char* path = include.value();

			pugi::xml_document doc;
			if (!load_preprocess(doc, path)) return false;

			// insert the comment marker above include directive
			node.insert_child_before(pugi::node_comment, include).set_value(path);

			// copy the document above the include directive (this retains the original order!)
			for (pugi::xml_node ic = doc.first_child(); ic; ic = ic.next_sibling())
			{
				node.insert_copy_before(ic, include);
			}

			// remove the include node and move to the next child
			child = child.next_sibling();

			node.remove_child(include);
		}
		else
		{
			if (!preprocess(child)) return false;

			child = child.next_sibling();
		}
	}

	return true;
}

bool load_preprocess(pugi::xml_document& doc, const char* path)
{
	pugi::xml_parse_result result = doc.load_file(path, pugi::parse_default | pugi::parse_pi); // for <?include?>
	
	return result ? preprocess(doc) : false;
}
//]

int main()
{
	pugi::xml_document doc;
	if (!load_preprocess(doc, "character.xml")) return -1;

	doc.print(std::cout);
}