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diff --git a/indra/llui/lluistring.h b/indra/llui/lluistring.h
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+/** 
+ * @file lluistring.h
+ * @author: Steve Bennetts
+ * @brief LLUIString base class
+ *
+ * Copyright (c) 2006-$CurrentYear$, Linden Research, Inc.
+ * $License$
+ */
+
+#ifndef LL_LLUISTRING_H
+#define LL_LLUISTRING_H
+
+// lluistring.h
+//
+// Copyright 2006, Linden Research, Inc.
+// Original aurthor: Steve
+
+#include "stdtypes.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");
+// llinfos << mMessage.getString().c_str() << llendl; // outputs "Welcome Steve to Second Life"
+// mMessage.setArg("[USERNAME]", "Joe");
+// llinfos << mMessage.getString().c_str() << llendl; // outputs "Welcome Joe to Second Life"
+// mMessage = "Recepción a la [SECONDLIFE] [USERNAME]"
+// mMessage.setArg("[SECONDLIFE]", "Segunda Vida");
+// llinfos << mMessage.getString().c_str() << llendl; // outputs "Recepción a la Segunda Vida Joe"
+
+// Implementation Notes:
+// Attempting to have operator[](const LLString& 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() {}
+	LLUIString(const LLString& instring, const LLString::format_map_t& args);
+	LLUIString(const LLString& instring) { assign(instring); }
+
+	void assign(const LLString& instring);
+	LLUIString& operator=(const LLString& s) { assign(s); return *this; }
+
+	void setArgList(const LLString::format_map_t& args);
+	void setArg(const LLString& key, const LLString& replacement);
+
+	const LLString& getString() const { return mResult; }
+	operator LLString() const { return mResult; }
+
+	const LLWString& getWString() const { return mWResult; }
+	operator LLWString() const { return mWResult; }
+
+	bool empty() const { return mWResult.empty(); }
+	S32 length() const { return mWResult.size(); }
+
+	void clear();
+	void clearArgs();
+	
+	// These utuilty 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:
+	void format();	
+	
+	LLString mOrig;
+	LLString mResult;
+	LLWString mWResult; // for displaying
+	LLString::format_map_t mArgs;
+};
+
+#endif // LL_LLUISTRING_H