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/**
* @file lluistring.h
* @author: Steve Bennetts
* @brief A fancy wrapper for std::string supporting argument substitutions.
*
* $LicenseInfo:firstyear=2006&license=viewerlgpl$
* 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
* $/LicenseInfo$
*/
#ifndef LL_LLUISTRING_H
#define LL_LLUISTRING_H
#include "llstring.h"
#include <string>
// Use this class to store translated text that may have arguments
// e.g. "Welcome [USERNAME] to [SECONDLIFE]!"
// Adding or changing an argument will update the result string, preserving the origianl
// Thus, subsequent changes to arguments or even the original string will produce
// the correct result
// Example Usage:
// LLUIString mMessage("Welcome [USERNAME] to [SECONDLIFE]!");
// mMessage.setArg("[USERNAME]", "Steve");
// mMessage.setArg("[SECONDLIFE]", "Second Life");
// LL_INFOS() << mMessage.getString() << LL_ENDL; // outputs "Welcome Steve to Second Life"
// mMessage.setArg("[USERNAME]", "Joe");
// LL_INFOS() << mMessage.getString() << LL_ENDL; // outputs "Welcome Joe to Second Life"
// mMessage = "Bienvenido a la [SECONDLIFE] [USERNAME]"
// mMessage.setArg("[SECONDLIFE]", "Segunda Vida");
// LL_INFOS() << mMessage.getString() << LL_ENDL; // outputs "Bienvenido a la Segunda Vida Joe"
// Implementation Notes:
// Attempting to have operator[](const std::string& s) return mArgs[s] fails because we have
// to call format() after the assignment happens.
class LLUIString
{
public:
// These methods all perform appropriate argument substitution
// and modify mOrig where appropriate
LLUIString() : mArgs(NULL), mNeedsResult(false), mNeedsWResult(false) {}
LLUIString(const std::string& instring, const LLStringUtil::format_map_t& args);
LLUIString(const std::string& instring) : mArgs(NULL) { assign(instring); }
LLUIString(const LLWString& instring) : mArgs(NULL) { insert(0, instring); }
~LLUIString() { delete mArgs; }
void assign(const std::string& instring);
LLUIString& operator=(const std::string& s) { assign(s); return *this; }
void setArgList(const LLStringUtil::format_map_t& args);
void setArgs(const LLStringUtil::format_map_t& args) { setArgList(args); }
void setArgs(const class LLSD& sd);
void setArg(const std::string& key, const std::string& replacement);
const std::string& getString() const { return getUpdatedResult(); }
operator std::string() const { return getUpdatedResult(); }
const LLWString& getWString() const { return getUpdatedWResult(); }
operator LLWString() const { return getUpdatedWResult(); }
bool empty() const { return getUpdatedResult().empty(); }
S32 length() const { return static_cast<S32>(getUpdatedWResult().size()); }
void clear();
void clearArgs() { if (mArgs) mArgs->clear(); }
// These utility functions are included for text editing.
// They do not affect mOrig and do not perform argument substitution
void truncate(S32 maxchars);
void erase(S32 charidx, S32 len);
void insert(S32 charidx, const LLWString& wchars);
void replace(S32 charidx, llwchar wc);
private:
// something changed, requiring reformatting of strings
void dirty();
std::string& getUpdatedResult() const { if (mNeedsResult) { updateResult(); } return mResult; }
LLWString& getUpdatedWResult() const{ if (mNeedsWResult) { updateWResult(); } return mWResult; }
// do actual work of updating strings (non-inlined)
void updateResult() const;
void updateWResult() const;
LLStringUtil::format_map_t& getArgs();
std::string mOrig;
mutable std::string mResult;
mutable LLWString mWResult; // for displaying
LLStringUtil::format_map_t* mArgs;
// controls lazy evaluation
mutable bool mNeedsResult;
mutable bool mNeedsWResult;
};
#endif // LL_LLUISTRING_H
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