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docutils.cpp
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	/* Any copyright is dedicated to the Public Domain.
	* http://creativecommons.org/publicdomain/zero/1.0/
	*
	* \file docutils.cpp
	* \brief Documentation processing
	*
	*/

	#include "docutils.h"

	#include <iostream>
	#include <fstream>
	#include <assert.h>
	#include <libxml/parser.h>
	#include <libxml/xpath.h>
	#include <libxml/xpathInternals.h>

	using namespace std;

	std::string
	getDocumentationExampleById(std::string filename, std::string id) {
	string query = string("(//db:programlisting \| //db:code \| //db:screen)[@xml:id='") + id + "']";
	xmlDocPtr doc = xmlParseFile(filename.c_str());
	if(!doc) {
	cout << "Can't find documentation file: " << filename << endl;
	assert(false);
	return "";
	}

	xmlXPathContextPtr context = xmlXPathNewContext(doc);
	xmlXPathRegisterNs(context, BAD_CAST "db", BAD_CAST "http://docbook.org/ns/docbook");

	xmlXPathObjectPtr response = xmlXPathEvalExpression((xmlChar*) query.c_str(), context);
	xmlXPathFreeContext(context);
	xmlNodeSetPtr nodeset = response->nodesetval;

	if(nodeset->nodeNr != 1) {
	cout << "Can't find specified example " << id << endl;
	assert(false);
	return "";
	}

	string tag = (char*) nodeset->nodeTab[0]->name;
	bool flagIsPrgListing = tag == "programlisting";
	xmlChar* contentC = xmlNodeListGetString(doc, nodeset->nodeTab[0]->xmlChildrenNode, 1);
	string content = (char*) contentC;
	xmlFree(contentC);
	xmlXPathFreeObject(response);

	//skip first line(used as header)
	if(flagIsPrgListing) {
	content = content.substr(content.find('\n') + 1);
	}

	//replace no break spaces
	replaceAll(content, "\u00A0", " ");

	assert(content.size() && "Empty example");
	return content;
	}

	std::string
	getDocumentationExampleFromFile(std::string filename) {
	std::ifstream stream(filename);
	std::string result;

	stream.seekg(0, std::ios::end);
	result.reserve(stream.tellg());
	stream.seekg(0, std::ios::beg);

	result.assign((std::istreambuf_iterator<char>(stream)),
	std::istreambuf_iterator<char>());

	assert(result.size() && "Empty example");

	return result;
	}

	void
	replace(std::string &str, const std::string &subA, const std::string &subB) {
	size_t posA = str.find(subA);
	assert(posA != string::npos);

	str.replace(posA, subA.size(), subB);
	}

	void
	replaceAll(std::string &str, const std::string &subA, const std::string &subB) {
	size_t posA = str.find(subA);

	while(posA != string::npos) {
	str.replace(posA, subA.size(), subB);
	posA = str.find(subA);
	}
	}

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