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/** 
 * @file llviewerhelp.cpp
 * @brief Utility functions for the Help system
 * @author Soft Linden
 *
 * $LicenseInfo:firstyear=2009&license=viewergpl$
 * 
 * Copyright (c) 2009, Linden Research, Inc.
 * 
 * Second Life Viewer Source Code
 * The source code in this file ("Source Code") is provided by Linden Lab
 * to you under the terms of the GNU General Public License, version 2.0
 * ("GPL"), unless you have obtained a separate licensing agreement
 * ("Other License"), formally executed by you and Linden Lab.  Terms of
 * the GPL can be found in doc/GPL-license.txt in this distribution, or
 * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
 * 
 * There are special exceptions to the terms and conditions of the GPL as
 * it is applied to this Source Code. View the full text of the exception
 * in the file doc/FLOSS-exception.txt in this software distribution, or
 * online at
 * http://secondlifegrid.net/programs/open_source/licensing/flossexception
 * 
 * By copying, modifying or distributing this software, you acknowledge
 * that you have read and understood your obligations described above,
 * and agree to abide by those obligations.
 * 
 * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
 * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
 * COMPLETENESS OR PERFORMANCE.
 * $/LicenseInfo$
 */

#include "llviewerprecompiledheaders.h"
#include "llviewerhelputil.h"

#include "llsd.h"
#include "llstring.h"
#include "lluri.h"
#include "llweb.h"
#include "llviewercontrol.h"

//////////////////////////////////////////////
// Build a help URL from a topic and formatter

//static
std::string LLViewerHelpUtil::helpURLEncode( const std::string &component )
{
	// Every character rfc3986 allows as unreserved in 2.3, minus the tilde
	// which we may grant special meaning. Yay.
	const char* allowed =   
	"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
	"abcdefghijklmnopqrstuvwxyz"
	"0123456789"
	"-._";
	std::string escaped = LLURI::escape(component, allowed);
	
	return escaped;
}

//static
std::string LLViewerHelpUtil::buildHelpURL( const std::string &topic)
{
	LLSD substitution;
	substitution["TOPIC"] = helpURLEncode(topic);
	
	// get the help URL and expand all of the substitutions
	// (also adds things like [LANGUAGE], [VERSION], [OS], etc.)
	std::string helpURL = gSavedSettings.getString("HelpURLFormat");
	return LLWeb::expandURLSubstitutions(helpURL, substitution);
}