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/**
 * @file llviewerhelp.cpp
 * @brief Utility functions for the Help system
 * @author Soft Linden
 *
 * $LicenseInfo:firstyear=2009&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

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

#include "llagent.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);
    substitution["DEBUG_MODE"] = gAgent.isGodlike() ? "/debug" : "";

    // 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);
}