merge from viewer-development

6 files changed, 789 insertions, 243 deletions

diff --git a/indra/llxuixml/llinitparam.cpp b/indra/llxuixml/llinitparam.cpp
index 0b324a10c9..2c92539387 100644
--- a/indra/llxuixml/llinitparam.cpp
+++ b/indra/llxuixml/llinitparam.cpp
@@ -68,7 +68,6 @@ namespace LLInitParam
 	void BlockDescriptor::aggregateBlockData(BlockDescriptor& src_block_data) 
 	{
 		mNamedParams.insert(src_block_data.mNamedParams.begin(), src_block_data.mNamedParams.end());
-		mSynonyms.insert(src_block_data.mSynonyms.begin(), src_block_data.mSynonyms.end());
 		std::copy(src_block_data.mUnnamedParams.begin(), src_block_data.mUnnamedParams.end(), std::back_inserter(mUnnamedParams));
 		std::copy(src_block_data.mValidationList.begin(), src_block_data.mValidationList.end(), std::back_inserter(mValidationList));
 		std::copy(src_block_data.mAllParams.begin(), src_block_data.mAllParams.end(), std::back_inserter(mAllParams));
@@ -78,8 +77,7 @@ namespace LLInitParam
 	// BaseBlock
 	//
 	BaseBlock::BaseBlock()
-	:	mChangeVersion(0),
-		mBlockDescriptor(NULL)
+	:	mChangeVersion(0)
 	{}
 
 	BaseBlock::~BaseBlock()
@@ -88,8 +86,6 @@ namespace LLInitParam
 	// called by each derived class in least to most derived order
 	void BaseBlock::init(BlockDescriptor& descriptor, BlockDescriptor& base_descriptor, size_t block_size)
 	{
-		mBlockDescriptor = &descriptor;
-
 		descriptor.mCurrentBlockPtr = this;
 		descriptor.mMaxParamOffset = block_size;
 
@@ -182,7 +178,7 @@ namespace LLInitParam
 			param_handle_t param_handle = it->second->mParamHandle;
 			const Param* param = getParamFromHandle(param_handle);
 			ParamDescriptor::serialize_func_t serialize_func = it->second->mSerializeFunc;
-			if (serialize_func)
+			if (serialize_func && param->anyProvided())
 			{
 				// Ensure this param has not already been serialized
 				// Prevents <rect> from being serialized as its own tag.
@@ -274,22 +270,6 @@ namespace LLInitParam
 			}
 		}
 
-		for(BlockDescriptor::param_map_t::const_iterator it = block_data.mSynonyms.begin();
-			it != block_data.mSynonyms.end();
-			++it)
-		{
-			param_handle_t param_handle = it->second->mParamHandle;
-			const Param* param = getParamFromHandle(param_handle);
-			ParamDescriptor::inspect_func_t inspect_func = it->second->mInspectFunc;
-			if (inspect_func)
-			{
-				// use existing serial number for param
-				name_stack.push_back(std::make_pair(it->first, it->second->mGeneration));
-				inspect_func(*param, parser, name_stack, it->second->mMinCount, it->second->mMaxCount);
-				name_stack.pop_back();
-			}
-		}
-
 		return true;
 	}
 
@@ -311,22 +291,9 @@ namespace LLInitParam
 				// find pointer to member parameter from offset table
 				paramp = getParamFromHandle(found_it->second->mParamHandle);
 				deserialize_func = found_it->second->mDeserializeFunc;
-			}
-			else
-			{
-				BlockDescriptor::param_map_t::iterator found_it = block_data.mSynonyms.find(top_name);
-				if (found_it != block_data.mSynonyms.end())
-				{
-					// find pointer to member parameter from offset table
-					paramp = getParamFromHandle(found_it->second->mParamHandle);
-					deserialize_func = found_it->second->mDeserializeFunc;
-				}
-			}
 					
-			Parser::name_stack_range_t new_name_stack(name_stack.first, name_stack.second);
-			++new_name_stack.first;
-			if (deserialize_func)
-			{
+				Parser::name_stack_range_t new_name_stack(name_stack.first, name_stack.second);
+				++new_name_stack.first;
 				return deserialize_func(*paramp, p, new_name_stack, name_stack.first == name_stack.second ? -1 : name_stack.first->second);
 			}
 		}
@@ -401,7 +368,7 @@ namespace LLInitParam
 				}
 				else
 				{
-					block_data.mSynonyms[synonym] = param_descriptor;
+					block_data.mNamedParams[synonym] = param_descriptor;
 				}
 			}
 		}
@@ -426,14 +393,6 @@ namespace LLInitParam
 			}
 		}
 
-		for (BlockDescriptor::param_map_t::const_iterator it = block_data.mSynonyms.begin(); it != block_data.mSynonyms.end(); ++it)
-		{
-			if (it->second->mParamHandle == handle)
-			{
-				return it->first;
-			}
-		}
-
 		return LLStringUtil::null;
 	}
 
diff --git a/indra/llxuixml/llinitparam.h b/indra/llxuixml/llinitparam.h
index 869b0c2cd6..8cb5bd80fc 100644
--- a/indra/llxuixml/llinitparam.h
+++ b/indra/llxuixml/llinitparam.h
@@ -34,6 +34,7 @@ f * @file llinitparam.h
 #include <boost/function.hpp>
 #include <boost/bind.hpp>
 #include <boost/type_traits/is_convertible.hpp>
+#include <boost/unordered_map.hpp>
 #include "llregistry.h"
 #include "llmemory.h"
 
@@ -196,36 +197,39 @@ namespace LLInitParam
 		typedef std::pair<name_stack_t::const_iterator, name_stack_t::const_iterator>	name_stack_range_t;
 		typedef std::vector<std::string>							possible_values_t;
 
-		typedef boost::function<bool (void*)>															parser_read_func_t;
-		typedef boost::function<bool (const void*, const name_stack_t&)>								parser_write_func_t;
+		typedef bool (*parser_read_func_t)(Parser& parser, void* output);
+		typedef bool (*parser_write_func_t)(Parser& parser, const void*, const name_stack_t&);
 		typedef boost::function<void (const name_stack_t&, S32, S32, const possible_values_t*)>	parser_inspect_func_t;
 
 		typedef std::map<const std::type_info*, parser_read_func_t, CompareTypeID>		parser_read_func_map_t;
 		typedef std::map<const std::type_info*, parser_write_func_t, CompareTypeID>		parser_write_func_map_t;
 		typedef std::map<const std::type_info*, parser_inspect_func_t, CompareTypeID>	parser_inspect_func_map_t;
 
-		Parser()
+		Parser(parser_read_func_map_t& read_map, parser_write_func_map_t& write_map, parser_inspect_func_map_t& inspect_map)
 		:	mParseSilently(false),
-			mParseGeneration(0)
+			mParseGeneration(0),
+			mParserReadFuncs(&read_map),
+			mParserWriteFuncs(&write_map),
+			mParserInspectFuncs(&inspect_map)
 		{}
 		virtual ~Parser();
 
 		template <typename T> bool readValue(T& param)
 	    {
-		    parser_read_func_map_t::iterator found_it = mParserReadFuncs.find(&typeid(T));
-		    if (found_it != mParserReadFuncs.end())
+		    parser_read_func_map_t::iterator found_it = mParserReadFuncs->find(&typeid(T));
+		    if (found_it != mParserReadFuncs->end())
 		    {
-			    return found_it->second((void*)&param);
+			    return found_it->second(*this, (void*)&param);
 		    }
 		    return false;
 	    }
 
 		template <typename T> bool writeValue(const T& param, const name_stack_t& name_stack)
 		{
-		    parser_write_func_map_t::iterator found_it = mParserWriteFuncs.find(&typeid(T));
-		    if (found_it != mParserWriteFuncs.end())
+		    parser_write_func_map_t::iterator found_it = mParserWriteFuncs->find(&typeid(T));
+		    if (found_it != mParserWriteFuncs->end())
 		    {
-			    return found_it->second((const void*)&param, name_stack);
+			    return found_it->second(*this, (const void*)&param, name_stack);
 		    }
 		    return false;
 		}
@@ -233,8 +237,8 @@ namespace LLInitParam
 		// dispatch inspection to registered inspection functions, for each parameter in a param block
 		template <typename T> bool inspectValue(const name_stack_t& name_stack, S32 min_count, S32 max_count, const possible_values_t* possible_values)
 		{
-		    parser_inspect_func_map_t::iterator found_it = mParserInspectFuncs.find(&typeid(T));
-		    if (found_it != mParserInspectFuncs.end())
+		    parser_inspect_func_map_t::iterator found_it = mParserInspectFuncs->find(&typeid(T));
+		    if (found_it != mParserInspectFuncs->end())
 		    {
 			    found_it->second(name_stack, min_count, max_count, possible_values);
 				return true;
@@ -246,7 +250,6 @@ namespace LLInitParam
 		virtual void parserWarning(const std::string& message);
 		virtual void parserError(const std::string& message);
 		void setParseSilently(bool silent) { mParseSilently = silent; }
-		bool getParseSilently() { return mParseSilently; }
 
 		S32 getParseGeneration() { return mParseGeneration; }
 		S32 newParseGeneration() { return ++mParseGeneration; }
@@ -254,24 +257,24 @@ namespace LLInitParam
 
 	protected:
 		template <typename T>
-		void registerParserFuncs(parser_read_func_t read_func, parser_write_func_t write_func)
+		void registerParserFuncs(parser_read_func_t read_func, parser_write_func_t write_func = NULL)
 		{
-			mParserReadFuncs.insert(std::make_pair(&typeid(T), read_func));
-			mParserWriteFuncs.insert(std::make_pair(&typeid(T), write_func));
+			mParserReadFuncs->insert(std::make_pair(&typeid(T), read_func));
+			mParserWriteFuncs->insert(std::make_pair(&typeid(T), write_func));
 		}
 
 		template <typename T>
 		void registerInspectFunc(parser_inspect_func_t inspect_func)
 		{
-			mParserInspectFuncs.insert(std::make_pair(&typeid(T), inspect_func));
+			mParserInspectFuncs->insert(std::make_pair(&typeid(T), inspect_func));
 		}
 
 		bool				mParseSilently;
 
 	private:
-		parser_read_func_map_t		mParserReadFuncs;
-		parser_write_func_map_t		mParserWriteFuncs;
-		parser_inspect_func_map_t	mParserInspectFuncs;
+		parser_read_func_map_t*		mParserReadFuncs;
+		parser_write_func_map_t*	mParserWriteFuncs;
+		parser_inspect_func_map_t*	mParserInspectFuncs;
 		S32	mParseGeneration;
 	};
 
@@ -284,7 +287,7 @@ namespace LLInitParam
 		void setProvided(bool is_provided) { mIsProvided = is_provided; }
 
 	protected:
-		bool getProvided() const { return mIsProvided; }
+		bool anyProvided() const { return mIsProvided; }
 
 		Param(class BaseBlock* enclosing_block);
 
@@ -380,14 +383,13 @@ namespace LLInitParam
 		void aggregateBlockData(BlockDescriptor& src_block_data);
 
 	public:
-		typedef std::map<const std::string, ParamDescriptor*> param_map_t; // references param descriptors stored in mAllParams
+		typedef boost::unordered_map<const std::string, ParamDescriptor*> param_map_t; // references param descriptors stored in mAllParams
 		typedef std::vector<ParamDescriptor*> param_list_t; 
 
 		typedef std::list<ParamDescriptor> all_params_list_t;// references param descriptors stored in mAllParams
 		typedef std::vector<std::pair<param_handle_t, ParamDescriptor::validation_func_t> > param_validation_list_t;
 
 		param_map_t						mNamedParams;			// parameters with associated names
-		param_map_t						mSynonyms;				// parameters with alternate names
 		param_list_t					mUnnamedParams;			// parameters with_out_ associated names
 		param_validation_list_t			mValidationList;		// parameters that must be validated
 		all_params_list_t				mAllParams;				// all parameters, owns descriptors
@@ -473,8 +475,8 @@ namespace LLInitParam
 		bool serializeBlock(Parser& p, Parser::name_stack_t name_stack = Parser::name_stack_t(), const BaseBlock* diff_block = NULL) const;
 		bool inspectBlock(Parser& p, Parser::name_stack_t name_stack = Parser::name_stack_t()) const;
 
-		const BlockDescriptor& mostDerivedBlockDescriptor() const { return *mBlockDescriptor; }
-		BlockDescriptor& mostDerivedBlockDescriptor() { return *mBlockDescriptor; }
+		virtual const BlockDescriptor& mostDerivedBlockDescriptor() const { return selfBlockDescriptor(); }
+		virtual BlockDescriptor& mostDerivedBlockDescriptor() { return selfBlockDescriptor(); }
 
 		// take all provided params from other and apply to self
 		bool overwriteFrom(const BaseBlock& other)
@@ -499,8 +501,6 @@ namespace LLInitParam
 		// can be updated in getters
 		mutable S32				mChangeVersion;
 
-		BlockDescriptor*		mBlockDescriptor;	// most derived block descriptor
-
 		static BlockDescriptor& selfBlockDescriptor()
 		{
 			static BlockDescriptor sBlockDescriptor;
@@ -568,7 +568,7 @@ namespace LLInitParam
 			mData.mValue = value;
 		} 
 
-		bool isProvided() const { return Param::getProvided(); }
+		bool isProvided() const { return Param::anyProvided(); }
 
 		static bool deserializeParam(Param& param, Parser& parser, const Parser::name_stack_range_t& name_stack, S32 generation) 
 		{ 
@@ -576,7 +576,7 @@ namespace LLInitParam
 			// no further names in stack, attempt to parse value now
 			if (name_stack.first == name_stack.second)
 			{
-				if (parser.readValue<T>(typed_param.mData.mValue))
+				if (parser.readValue(typed_param.mData.mValue))
 				{
 					typed_param.mData.clearKey();
 					typed_param.setProvided(true);
@@ -589,7 +589,7 @@ namespace LLInitParam
 				{
 					// try to parse a known named value
 					std::string name;
-					if (parser.readValue<std::string>(name))
+					if (parser.readValue(name))
 					{
 						// try to parse a per type named value
 						if (NAME_VALUE_LOOKUP::get(name, typed_param.mData.mValue))
@@ -624,7 +624,7 @@ namespace LLInitParam
 			{
 				if (!diff_param || !ParamCompare<std::string>::equals(static_cast<const self_t*>(diff_param)->mData.getKey(), key))
 				{
-					if (!parser.writeValue<std::string>(key, name_stack))
+					if (!parser.writeValue(key, name_stack))
 					{
 						return;
 					}
@@ -632,7 +632,7 @@ namespace LLInitParam
 			}
 			// then try to serialize value directly
 			else if (!diff_param || !ParamCompare<T>::equals(typed_param.get(), static_cast<const self_t*>(diff_param)->get()))					{
-				if (!parser.writeValue<T>(typed_param.mData.mValue, name_stack)) 
+				if (!parser.writeValue(typed_param.mData.mValue, name_stack)) 
 				{
 					return;
 				}
@@ -745,7 +745,7 @@ namespace LLInitParam
 			{
 				// try to parse a known named value
 				std::string name;
-				if (parser.readValue<std::string>(name))
+				if (parser.readValue(name))
 				{
 					// try to parse a per type named value
 					if (NAME_VALUE_LOOKUP::get(name, typed_param))
@@ -772,7 +772,7 @@ namespace LLInitParam
 			std::string key = typed_param.mData.getKey();
 			if (!key.empty() && typed_param.mData.mKeyVersion == typed_param.getLastChangeVersion())
 			{
-				if (!parser.writeValue<std::string>(key, name_stack))
+				if (!parser.writeValue(key, name_stack))
 				{
 					return;
 				}
@@ -795,13 +795,13 @@ namespace LLInitParam
 		bool isProvided() const 
 		{ 
 			// only validate block when it hasn't already passed validation and user has supplied *some* value
-			if (Param::getProvided() && mData.mValidatedVersion < T::getLastChangeVersion())
+			if (Param::anyProvided() && mData.mValidatedVersion < T::getLastChangeVersion())
 			{
 				// a sub-block is "provided" when it has been filled in enough to be valid
 				mData.mValidated = T::validateBlock(false);
 				mData.mValidatedVersion = T::getLastChangeVersion();
 			}
-			return Param::getProvided() && mData.mValidated;
+			return Param::anyProvided() && mData.mValidated;
 		}
 
 		// assign block contents to this param-that-is-a-block
@@ -852,7 +852,7 @@ namespace LLInitParam
 		{
 			const self_t& src_typed_param = static_cast<const self_t&>(src);
 			self_t& dst_typed_param = static_cast<self_t&>(dst);
-			if (dst_typed_param.T::merge(T::selfBlockDescriptor(), src_typed_param, overwrite || !dst_typed_param.isProvided()))
+			if (dst_typed_param.T::merge(T::selfBlockDescriptor(), src_typed_param, overwrite))
 			{
 				dst_typed_param.mData.clearKey();
 				return true;
@@ -909,7 +909,7 @@ namespace LLInitParam
 			}
 		} 
 
-		bool isProvided() const { return Param::getProvided(); }
+		bool isProvided() const { return Param::anyProvided(); }
 
 		static bool deserializeParam(Param& param, Parser& parser, const Parser::name_stack_range_t& name_stack, S32 generation) 
 		{ 
@@ -919,7 +919,7 @@ namespace LLInitParam
 			if (name_stack.first == name_stack.second)
 			{
 				// attempt to read value directly
-				if (parser.readValue<value_t>(value))
+				if (parser.readValue(value))
 				{
 					typed_param.mValues.push_back(value);
 					// save an empty name/value key as a placeholder
@@ -934,7 +934,7 @@ namespace LLInitParam
 				{
 					// try to parse a known named value
 					std::string name;
-					if (parser.readValue<std::string>(name))
+					if (parser.readValue(name))
 					{
 						// try to parse a per type named value
 						if (NAME_VALUE_LOOKUP::get(name, typed_param.mValues))
@@ -958,7 +958,7 @@ namespace LLInitParam
 			const self_t& typed_param = static_cast<const self_t&>(param);
 			if (!typed_param.isProvided() || name_stack.empty()) return;
 
-			typename container_t::const_iterator it = typed_param.mValues.begin();
+			const_iterator it = typed_param.mValues.begin();
 			for (typename std::vector<key_cache_t>::const_iterator key_it = typed_param.mCachedKeys.begin();
 				it != typed_param.mValues.end();
 				++key_it, ++it)
@@ -968,13 +968,13 @@ namespace LLInitParam
 
 				if(!key.empty())
 				{
-					if(!parser.writeValue<std::string>(key, name_stack))
+					if(!parser.writeValue(key, name_stack))
 					{
 						return;
 					}
 				}
 				// not parse via name values, write out value directly
-				else if (!parser.writeValue<VALUE_TYPE>(*it, name_stack))
+				else if (!parser.writeValue(*it, name_stack))
 				{
 					return;
 				}
@@ -1025,8 +1025,15 @@ namespace LLInitParam
 
 		// implicit conversion
 		operator value_assignment_t() const { return self_t::get(); } 
-		// explicit conversion
-		value_assignment_t operator()() const { return get(); } 
+
+		typedef typename container_t::iterator iterator;
+		typedef typename container_t::const_iterator const_iterator;
+		iterator begin() { return mValues.begin(); }
+		iterator end() { return mValues.end(); }
+		const_iterator begin() const { return mValues.begin(); }
+		const_iterator end() const { return mValues.end(); }
+		bool empty() const { return mValues.empty(); }
+		size_t size() const { return mValues.size(); }
 
 		U32 numValidElements() const
 		{
@@ -1092,7 +1099,7 @@ namespace LLInitParam
 			}
 		} 
 
-		bool isProvided() const { return Param::getProvided(); }
+		bool isProvided() const { return Param::anyProvided(); }
 
 		value_ref_t operator[](S32 index) { return mValues[index]; }
 		value_const_ref_t operator[](S32 index) const { return mValues[index]; }
@@ -1100,32 +1107,41 @@ namespace LLInitParam
 		static bool deserializeParam(Param& param, Parser& parser, const Parser::name_stack_range_t& name_stack, S32 generation) 
 		{ 
 			self_t& typed_param = static_cast<self_t&>(param);
+			bool new_value = false;
 			if (generation != typed_param.mLastParamGeneration || typed_param.mValues.empty())
 			{
+				new_value = true;
 				typed_param.mValues.push_back(value_t());
 				typed_param.mCachedKeys.push_back(Data());
-				typed_param.enclosingBlock().setLastChangedParam(param, true);
-				typed_param.mLastParamGeneration = generation;
 			}
 
-			value_t& value = typed_param.mValues.back();
+			value_ref_t value = typed_param.mValues.back();
 
 			// attempt to parse block...
 			if(value.deserializeBlock(parser, name_stack))
 			{
+				if (new_value)
+				{	// successfully parsed new value, let's keep it
+					typed_param.mLastParamGeneration = generation;
+				}
+				typed_param.enclosingBlock().setLastChangedParam(param, true);
 				typed_param.setProvided(true);
 				return true;
 			}
-
-			if(!NAME_VALUE_LOOKUP::empty())
+			else if(!NAME_VALUE_LOOKUP::empty())
 			{
 				// try to parse a known named value
 				std::string name;
-				if (parser.readValue<std::string>(name))
+				if (parser.readValue(name))
 				{
 					// try to parse a per type named value
 					if (NAME_VALUE_LOOKUP::get(name, value))
 					{
+						if (new_value)
+						{	// successfully parsed new value, let's keep it
+							typed_param.mLastParamGeneration = generation;
+						}
+
 						typed_param.mCachedKeys.back().setKey(name);
 						typed_param.mCachedKeys.back().mKeyVersion = value.getLastChangeVersion();
 						typed_param.enclosingBlock().setLastChangedParam(param, true);
@@ -1136,6 +1152,12 @@ namespace LLInitParam
 				}
 			}
 
+			if (new_value)
+			{	// failed to parse new value, pop it off
+				typed_param.mValues.pop_back();
+				typed_param.mCachedKeys.pop_back();
+			}
+
 			return false;
 		}
 
@@ -1144,7 +1166,7 @@ namespace LLInitParam
 			const self_t& typed_param = static_cast<const self_t&>(param);
 			if (!typed_param.isProvided() || name_stack.empty()) return;
 
-			typename container_t::const_iterator it = typed_param.mValues.begin();
+			const_iterator it = typed_param.mValues.begin();
 			for (typename std::vector<Data>::const_iterator key_it = typed_param.mCachedKeys.begin();
 				it != typed_param.mValues.end();
 				++key_it, ++it)
@@ -1154,7 +1176,7 @@ namespace LLInitParam
 				std::string key = key_it->getKey();
 				if (!key.empty() && key_it->mKeyVersion == it->getLastChangeVersion())
 				{
-					if(!parser.writeValue<std::string>(key, name_stack))
+					if(!parser.writeValue(key, name_stack))
 					{
 						return;
 					}
@@ -1208,13 +1230,20 @@ namespace LLInitParam
 
 		// implicit conversion
 		operator value_assignment_t() const { return self_t::get(); } 
-		// explicit conversion
-		value_assignment_t operator()() const { return get(); } 
+
+		typedef typename container_t::iterator iterator;
+		typedef typename container_t::const_iterator const_iterator;
+		iterator begin() { return mValues.begin(); }
+		iterator end() { return mValues.end(); }
+		const_iterator begin() const { return mValues.begin(); }
+		const_iterator end() const { return mValues.end(); }
+		bool empty() const { return mValues.empty(); }
+		size_t size() const { return mValues.size(); }
 
 		U32 numValidElements() const
 		{
 			U32 count = 0;
-			for (typename container_t::const_iterator it = mValues.begin();
+			for (const_iterator it = mValues.begin();
 				it != mValues.end();
 				++it)
 			{
@@ -1306,6 +1335,9 @@ namespace LLInitParam
 			BaseBlock::setLastChangedParam(last_param, user_provided);
 		}
 
+		virtual const BlockDescriptor& mostDerivedBlockDescriptor() const { return selfBlockDescriptor(); }
+		virtual BlockDescriptor& mostDerivedBlockDescriptor() { return selfBlockDescriptor(); }
+
 	protected:
 		Choice()
 		:	mCurChoice(0)
@@ -1415,6 +1447,10 @@ namespace LLInitParam
 		{
 			return BaseBlock::merge(selfBlockDescriptor(), other, false);
 		}
+
+		virtual const BlockDescriptor& mostDerivedBlockDescriptor() const { return selfBlockDescriptor(); }
+		virtual BlockDescriptor& mostDerivedBlockDescriptor() { return selfBlockDescriptor(); }
+
 	protected:
 		Block()
 		{
@@ -1494,15 +1530,13 @@ namespace LLInitParam
 			typedef Multiple<T, RANGE, NAME_VALUE_LOOKUP>							self_t;
 			typedef typename super_t::container_t									container_t;
 			typedef typename super_t::value_assignment_t							value_assignment_t;
-			typedef typename container_t::iterator									iterator;
-			typedef typename container_t::const_iterator							const_iterator;
+			typedef typename super_t::iterator										iterator;
+			typedef typename super_t::const_iterator								const_iterator;
 
 			explicit Multiple(const char* name = "", value_assignment_t val = DefaultInitializer<container_t>::get())
 			:	super_t(DERIVED_BLOCK::selfBlockDescriptor(), name, val, &validate, RANGE::minCount(), RANGE::maxCount())
 			{}
 
-			using super_t::operator();
-
 			Multiple& operator=(value_assignment_t val)
 			{
 				set(val);
@@ -1612,7 +1646,7 @@ namespace LLInitParam
 			// type to apply parse direct value T
 			if (name_stack.first == name_stack.second)
 			{
-				if(parser.readValue<T>(typed_param.mData.mValue))
+				if(parser.readValue(typed_param.mData.mValue))
 				{
 					typed_param.enclosingBlock().setLastChangedParam(param, true);
 					typed_param.setProvided(true);
@@ -1627,7 +1661,7 @@ namespace LLInitParam
 				{
 					// try to parse a known named value
 					std::string name;
-					if (parser.readValue<std::string>(name))
+					if (parser.readValue(name))
 					{
 						// try to parse a per type named value
 						if (TypeValues<T>::get(name, typed_param.mData.mValue))
@@ -1669,7 +1703,7 @@ namespace LLInitParam
 			{
 				if (!diff_param || !ParamCompare<std::string>::equals(static_cast<const self_t*>(diff_param)->mData.getKey(), key))
 				{
-					if (!parser.writeValue<std::string>(key, name_stack))
+					if (!parser.writeValue(key, name_stack))
 					{
 						return;
 					}
@@ -1679,7 +1713,7 @@ namespace LLInitParam
 			else if (!diff_param || !ParamCompare<T>::equals(typed_param.get(), (static_cast<const self_t*>(diff_param))->get()))	
             {
 				
-				if (parser.writeValue<T>(typed_param.mData.mValue, name_stack)) 
+				if (parser.writeValue(typed_param.mData.mValue, name_stack)) 
 				{
 					return;
 				}
@@ -1712,7 +1746,7 @@ namespace LLInitParam
 
 		bool isProvided() const 
 		{
-			if (!Param::getProvided()) return false;
+			if (!Param::anyProvided()) return false;
 
 			// block has an updated parameter
 			// if cached value is stale, regenerate from params
@@ -1779,7 +1813,7 @@ namespace LLInitParam
 		value_assignment_t get() const
 		{
 			// if some parameters were provided, issue warnings on invalid blocks
-			if (Param::getProvided() && (mData.mValueAge == OLDER_THAN_BLOCK))
+			if (Param::anyProvided() && (mData.mValueAge == OLDER_THAN_BLOCK))
 			{
 				// go ahead and issue warnings at this point if any param is invalid
 				if(block_t::validateBlock(true))
diff --git a/indra/llxuixml/llregistry.h b/indra/llxuixml/llregistry.h
index ee119b9ebc..eee9933739 100644
--- a/indra/llxuixml/llregistry.h
+++ b/indra/llxuixml/llregistry.h
@@ -70,6 +70,11 @@ public:
 			mMap.erase(key);
 		}
 
+		void replace(ref_const_key_t key, ref_const_value_t value)
+		{
+			mMap[key] = value;
+		}
+
 		typename registry_map_t::const_iterator beginItems() const
 		{
 			return mMap.begin();
diff --git a/indra/llxuixml/lltrans.cpp b/indra/llxuixml/lltrans.cpp
index 01e13864b6..11127a53f5 100644
--- a/indra/llxuixml/lltrans.cpp
+++ b/indra/llxuixml/lltrans.cpp
@@ -66,7 +66,8 @@ bool LLTrans::parseStrings(LLXMLNodePtr &root, const std::set<std::string>& defa
 	}
 
 	StringTable string_table;
-	LLXUIParser::instance().readXUI(root, string_table, xml_filename);
+	LLXUIParser parser;
+	parser.readXUI(root, string_table, xml_filename);
 
 	if (!string_table.validateBlock())
 	{
@@ -77,8 +78,8 @@ bool LLTrans::parseStrings(LLXMLNodePtr &root, const std::set<std::string>& defa
 	sStringTemplates.clear();
 	sDefaultArgs.clear();
 	
-	for(LLInitParam::ParamIterator<StringDef>::const_iterator it = string_table.strings().begin();
-		it != string_table.strings().end();
+	for(LLInitParam::ParamIterator<StringDef>::const_iterator it = string_table.strings.begin();
+		it != string_table.strings.end();
 		++it)
 	{
 		LLTransTemplate xml_template(it->name, it->value);
@@ -109,7 +110,8 @@ bool LLTrans::parseLanguageStrings(LLXMLNodePtr &root)
 	}
 	
 	StringTable string_table;
-	LLXUIParser::instance().readXUI(root, string_table, xml_filename);
+	LLXUIParser parser;
+	parser.readXUI(root, string_table, xml_filename);
 	
 	if (!string_table.validateBlock())
 	{
@@ -117,8 +119,8 @@ bool LLTrans::parseLanguageStrings(LLXMLNodePtr &root)
 		return false;
 	}
 		
-	for(LLInitParam::ParamIterator<StringDef>::const_iterator it = string_table.strings().begin();
-		it != string_table.strings().end();
+	for(LLInitParam::ParamIterator<StringDef>::const_iterator it = string_table.strings.begin();
+		it != string_table.strings.end();
 		++it)
 	{
 		// share the same map with parseStrings() so we can search the strings using the same getString() function.- angela
diff --git a/indra/llxuixml/llxuiparser.cpp b/indra/llxuixml/llxuiparser.cpp
index 8469debd3e..e1ad9a5c71 100644
--- a/indra/llxuixml/llxuiparser.cpp
+++ b/indra/llxuixml/llxuiparser.cpp
@@ -29,17 +29,28 @@
 #include "llxuiparser.h"
 
 #include "llxmlnode.h"
+#include "expat/expat.h"
 #include <fstream>
 #include <boost/tokenizer.hpp>
+//#include <boost/spirit/include/qi.hpp>
+#include <boost/spirit/include/classic_core.hpp>
 
 #include "lluicolor.h"
 
+using namespace BOOST_SPIRIT_CLASSIC_NS;
+
 const S32 MAX_STRING_ATTRIBUTE_SIZE = 40;
 
+static 	LLInitParam::Parser::parser_read_func_map_t sXSDReadFuncs;
+static 	LLInitParam::Parser::parser_write_func_map_t sXSDWriteFuncs;
+static 	LLInitParam::Parser::parser_inspect_func_map_t sXSDInspectFuncs;
+
+
 //
 // LLXSDWriter
 //
 LLXSDWriter::LLXSDWriter()
+: Parser(sXSDReadFuncs, sXSDWriteFuncs, sXSDInspectFuncs)
 {
 	registerInspectFunc<bool>(boost::bind(&LLXSDWriter::writeAttribute, this, "xs:boolean", _1, _2, _3, _4));
 	registerInspectFunc<std::string>(boost::bind(&LLXSDWriter::writeAttribute, this, "xs:string", _1, _2, _3, _4));
@@ -357,41 +368,35 @@ void LLXUIXSDWriter::writeXSD(const std::string& type_name, const std::string& p
 	fclose(xsd_file);
 }
 
+static 	LLInitParam::Parser::parser_read_func_map_t sXUIReadFuncs;
+static 	LLInitParam::Parser::parser_write_func_map_t sXUIWriteFuncs;
+static 	LLInitParam::Parser::parser_inspect_func_map_t sXUIInspectFuncs;
+
 //
 // LLXUIParser
 //
 LLXUIParser::LLXUIParser()
-:	mLastWriteGeneration(-1),
+:	Parser(sXUIReadFuncs, sXUIWriteFuncs, sXUIInspectFuncs),
+	mLastWriteGeneration(-1),
 	mCurReadDepth(0)
 {
-	registerParserFuncs<bool>(boost::bind(&LLXUIParser::readBoolValue, this, _1),
-								boost::bind(&LLXUIParser::writeBoolValue, this, _1, _2));
-	registerParserFuncs<std::string>(boost::bind(&LLXUIParser::readStringValue, this, _1),
-								boost::bind(&LLXUIParser::writeStringValue, this, _1, _2));
-	registerParserFuncs<U8>(boost::bind(&LLXUIParser::readU8Value, this, _1),
-								boost::bind(&LLXUIParser::writeU8Value, this, _1, _2));
-	registerParserFuncs<S8>(boost::bind(&LLXUIParser::readS8Value, this, _1),
-								boost::bind(&LLXUIParser::writeS8Value, this, _1, _2));
-	registerParserFuncs<U16>(boost::bind(&LLXUIParser::readU16Value, this, _1),
-								boost::bind(&LLXUIParser::writeU16Value, this, _1, _2));
-	registerParserFuncs<S16>(boost::bind(&LLXUIParser::readS16Value, this, _1),
-								boost::bind(&LLXUIParser::writeS16Value, this, _1, _2));
-	registerParserFuncs<U32>(boost::bind(&LLXUIParser::readU32Value, this, _1),
-								boost::bind(&LLXUIParser::writeU32Value, this, _1, _2));
-	registerParserFuncs<S32>(boost::bind(&LLXUIParser::readS32Value, this, _1),
-								boost::bind(&LLXUIParser::writeS32Value, this, _1, _2));
-	registerParserFuncs<F32>(boost::bind(&LLXUIParser::readF32Value, this, _1),
-								boost::bind(&LLXUIParser::writeF32Value, this, _1, _2));
-	registerParserFuncs<F64>(boost::bind(&LLXUIParser::readF64Value, this, _1),
-								boost::bind(&LLXUIParser::writeF64Value, this, _1, _2));
-	registerParserFuncs<LLColor4>(boost::bind(&LLXUIParser::readColor4Value, this, _1),
-								boost::bind(&LLXUIParser::writeColor4Value, this, _1, _2));
-	registerParserFuncs<LLUIColor>(boost::bind(&LLXUIParser::readUIColorValue, this, _1),
-								boost::bind(&LLXUIParser::writeUIColorValue, this, _1, _2));
-	registerParserFuncs<LLUUID>(boost::bind(&LLXUIParser::readUUIDValue, this, _1),
-								boost::bind(&LLXUIParser::writeUUIDValue, this, _1, _2));
-	registerParserFuncs<LLSD>(boost::bind(&LLXUIParser::readSDValue, this, _1),
-								boost::bind(&LLXUIParser::writeSDValue, this, _1, _2));
+	if (sXUIReadFuncs.empty())
+	{
+		registerParserFuncs<bool>(readBoolValue, writeBoolValue);
+		registerParserFuncs<std::string>(readStringValue, writeStringValue);
+		registerParserFuncs<U8>(readU8Value, writeU8Value);
+		registerParserFuncs<S8>(readS8Value, writeS8Value);
+		registerParserFuncs<U16>(readU16Value, writeU16Value);
+		registerParserFuncs<S16>(readS16Value, writeS16Value);
+		registerParserFuncs<U32>(readU32Value, writeU32Value);
+		registerParserFuncs<S32>(readS32Value, writeS32Value);
+		registerParserFuncs<F32>(readF32Value, writeF32Value);
+		registerParserFuncs<F64>(readF64Value, writeF64Value);
+		registerParserFuncs<LLColor4>(readColor4Value, writeColor4Value);
+		registerParserFuncs<LLUIColor>(readUIColorValue, writeUIColorValue);
+		registerParserFuncs<LLUUID>(readUUIDValue, writeUUIDValue);
+		registerParserFuncs<LLSD>(readSDValue, writeSDValue);
+	}
 }
 
 static LLFastTimer::DeclareTimer FTM_PARSE_XUI("XUI Parsing");
@@ -400,6 +405,7 @@ void LLXUIParser::readXUI(LLXMLNodePtr node, LLInitParam::BaseBlock& block, cons
 {
 	LLFastTimer timer(FTM_PARSE_XUI);
 	mNameStack.clear();
+	mRootNodeName = node->getName()->mString;
 	mCurFileName = filename;
 	mCurReadDepth = 0;
 	setParseSilently(silent);
@@ -410,11 +416,11 @@ void LLXUIParser::readXUI(LLXMLNodePtr node, LLInitParam::BaseBlock& block, cons
 	}
 	else
 	{
-		readXUIImpl(node, std::string(node->getName()->mString), block);
+		readXUIImpl(node, block);
 	}
 }
 
-bool LLXUIParser::readXUIImpl(LLXMLNodePtr nodep, const std::string& scope, LLInitParam::BaseBlock& block)
+bool LLXUIParser::readXUIImpl(LLXMLNodePtr nodep, LLInitParam::BaseBlock& block)
 {
 	typedef boost::tokenizer<boost::char_separator<char> > tokenizer;
 	boost::char_separator<char> sep(".");
@@ -481,7 +487,15 @@ bool LLXUIParser::readXUIImpl(LLXMLNodePtr nodep, const std::string& scope, LLIn
 			}
 
 			// check for proper nesting
-			if(!scope.empty() && *name_token_it != scope)
+			if (mNameStack.empty())
+			{
+				if (*name_token_it != mRootNodeName)
+				{
+					childp = childp->getNextSibling();
+					continue;
+				}
+			}
+			else if(mNameStack.back().first != *name_token_it)
 			{
 				childp = childp->getNextSibling();
 				continue;
@@ -499,7 +513,7 @@ bool LLXUIParser::readXUIImpl(LLXMLNodePtr nodep, const std::string& scope, LLIn
 		}
 
 		// recurse and visit children XML nodes
-		if(readXUIImpl(childp, mNameStack.empty() ? scope : mNameStack.back().first, block))
+		if(readXUIImpl(childp, block))
 		{
 			// child node successfully parsed, remove from DOM
 
@@ -615,17 +629,19 @@ LLXMLNodePtr LLXUIParser::getNode(const name_stack_t& stack)
 }
 
 
-bool LLXUIParser::readBoolValue(void* val_ptr)
+bool LLXUIParser::readBoolValue(Parser& parser, void* val_ptr)
 {
 	S32 value;
-	bool success = mCurReadNode->getBoolValue(1, &value);
+	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
+	bool success = self.mCurReadNode->getBoolValue(1, &value);
 	*((bool*)val_ptr) = (value != FALSE);
 	return success;
 }
 
-bool LLXUIParser::writeBoolValue(const void* val_ptr, const name_stack_t& stack)
+bool LLXUIParser::writeBoolValue(Parser& parser, const void* val_ptr, const name_stack_t& stack)
 {
-	LLXMLNodePtr node = getNode(stack);
+	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
+	LLXMLNodePtr node = self.getNode(stack);
 	if (node.notNull())
 	{
 		node->setBoolValue(*((bool*)val_ptr));
@@ -634,15 +650,17 @@ bool LLXUIParser::writeBoolValue(const void* val_ptr, const name_stack_t& stack)
 	return false;
 }
 
-bool LLXUIParser::readStringValue(void* val_ptr)
+bool LLXUIParser::readStringValue(Parser& parser, void* val_ptr)
 {
-	*((std::string*)val_ptr) = mCurReadNode->getSanitizedValue();
+	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
+	*((std::string*)val_ptr) = self.mCurReadNode->getSanitizedValue();
 	return true;
 }
 
-bool LLXUIParser::writeStringValue(const void* val_ptr, const name_stack_t& stack)
+bool LLXUIParser::writeStringValue(Parser& parser, const void* val_ptr, const name_stack_t& stack)
 {
-	LLXMLNodePtr node = getNode(stack);
+	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
+	LLXMLNodePtr node = self.getNode(stack);
 	if (node.notNull())
 	{
 		const std::string* string_val = reinterpret_cast<const std::string*>(val_ptr);
@@ -671,14 +689,16 @@ bool LLXUIParser::writeStringValue(const void* val_ptr, const name_stack_t& stac
 	return false;
 }
 
-bool LLXUIParser::readU8Value(void* val_ptr)
+bool LLXUIParser::readU8Value(Parser& parser, void* val_ptr)
 {
-	return mCurReadNode->getByteValue(1, (U8*)val_ptr);
+	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
+	return self.mCurReadNode->getByteValue(1, (U8*)val_ptr);
 }
 
-bool LLXUIParser::writeU8Value(const void* val_ptr, const name_stack_t& stack)
+bool LLXUIParser::writeU8Value(Parser& parser, const void* val_ptr, const name_stack_t& stack)
 {
-	LLXMLNodePtr node = getNode(stack);
+	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
+	LLXMLNodePtr node = self.getNode(stack);
 	if (node.notNull())
 	{
 		node->setUnsignedValue(*((U8*)val_ptr));
@@ -687,10 +707,11 @@ bool LLXUIParser::writeU8Value(const void* val_ptr, const name_stack_t& stack)
 	return false;
 }
 
-bool LLXUIParser::readS8Value(void* val_ptr)
+bool LLXUIParser::readS8Value(Parser& parser, void* val_ptr)
 {
+	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
 	S32 value;
-	if(mCurReadNode->getIntValue(1, &value))
+	if(self.mCurReadNode->getIntValue(1, &value))
 	{
 		*((S8*)val_ptr) = value;
 		return true;
@@ -698,9 +719,10 @@ bool LLXUIParser::readS8Value(void* val_ptr)
 	return false;
 }
 
-bool LLXUIParser::writeS8Value(const void* val_ptr, const name_stack_t& stack)
+bool LLXUIParser::writeS8Value(Parser& parser, const void* val_ptr, const name_stack_t& stack)
 {
-	LLXMLNodePtr node = getNode(stack);
+	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
+	LLXMLNodePtr node = self.getNode(stack);
 	if (node.notNull())
 	{
 		node->setIntValue(*((S8*)val_ptr));
@@ -709,10 +731,11 @@ bool LLXUIParser::writeS8Value(const void* val_ptr, const name_stack_t& stack)
 	return false;
 }
 
-bool LLXUIParser::readU16Value(void* val_ptr)
+bool LLXUIParser::readU16Value(Parser& parser, void* val_ptr)
 {
+	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
 	U32 value;
-	if(mCurReadNode->getUnsignedValue(1, &value))
+	if(self.mCurReadNode->getUnsignedValue(1, &value))
 	{
 		*((U16*)val_ptr) = value;
 		return true;
@@ -720,9 +743,10 @@ bool LLXUIParser::readU16Value(void* val_ptr)
 	return false;
 }
 
-bool LLXUIParser::writeU16Value(const void* val_ptr, const name_stack_t& stack)
+bool LLXUIParser::writeU16Value(Parser& parser, const void* val_ptr, const name_stack_t& stack)
 {
-	LLXMLNodePtr node = getNode(stack);
+	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
+	LLXMLNodePtr node = self.getNode(stack);
 	if (node.notNull())
 	{
 		node->setUnsignedValue(*((U16*)val_ptr));
@@ -731,10 +755,11 @@ bool LLXUIParser::writeU16Value(const void* val_ptr, const name_stack_t& stack)
 	return false;
 }
 
-bool LLXUIParser::readS16Value(void* val_ptr)
+bool LLXUIParser::readS16Value(Parser& parser, void* val_ptr)
 {
+	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
 	S32 value;
-	if(mCurReadNode->getIntValue(1, &value))
+	if(self.mCurReadNode->getIntValue(1, &value))
 	{
 		*((S16*)val_ptr) = value;
 		return true;
@@ -742,9 +767,10 @@ bool LLXUIParser::readS16Value(void* val_ptr)
 	return false;
 }
 
-bool LLXUIParser::writeS16Value(const void* val_ptr, const name_stack_t& stack)
+bool LLXUIParser::writeS16Value(Parser& parser, const void* val_ptr, const name_stack_t& stack)
 {
-	LLXMLNodePtr node = getNode(stack);
+	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
+	LLXMLNodePtr node = self.getNode(stack);
 	if (node.notNull())
 	{
 		node->setIntValue(*((S16*)val_ptr));
@@ -753,14 +779,16 @@ bool LLXUIParser::writeS16Value(const void* val_ptr, const name_stack_t& stack)
 	return false;
 }
 
-bool LLXUIParser::readU32Value(void* val_ptr)
+bool LLXUIParser::readU32Value(Parser& parser, void* val_ptr)
 {
-	return mCurReadNode->getUnsignedValue(1, (U32*)val_ptr);
+	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
+	return self.mCurReadNode->getUnsignedValue(1, (U32*)val_ptr);
 }
 
-bool LLXUIParser::writeU32Value(const void* val_ptr, const name_stack_t& stack)
+bool LLXUIParser::writeU32Value(Parser& parser, const void* val_ptr, const name_stack_t& stack)
 {
-	LLXMLNodePtr node = getNode(stack);
+	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
+	LLXMLNodePtr node = self.getNode(stack);
 	if (node.notNull())
 	{
 		node->setUnsignedValue(*((U32*)val_ptr));
@@ -769,14 +797,16 @@ bool LLXUIParser::writeU32Value(const void* val_ptr, const name_stack_t& stack)
 	return false;
 }
 
-bool LLXUIParser::readS32Value(void* val_ptr)
+bool LLXUIParser::readS32Value(Parser& parser, void* val_ptr)
 {
-	return mCurReadNode->getIntValue(1, (S32*)val_ptr);
+	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
+	return self.mCurReadNode->getIntValue(1, (S32*)val_ptr);
 }
 
-bool LLXUIParser::writeS32Value(const void* val_ptr, const name_stack_t& stack)
+bool LLXUIParser::writeS32Value(Parser& parser, const void* val_ptr, const name_stack_t& stack)
 {
-	LLXMLNodePtr node = getNode(stack);
+	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
+	LLXMLNodePtr node = self.getNode(stack);
 	if (node.notNull())
 	{
 		node->setIntValue(*((S32*)val_ptr));
@@ -785,14 +815,16 @@ bool LLXUIParser::writeS32Value(const void* val_ptr, const name_stack_t& stack)
 	return false;
 }
 
-bool LLXUIParser::readF32Value(void* val_ptr)
+bool LLXUIParser::readF32Value(Parser& parser, void* val_ptr)
 {
-	return mCurReadNode->getFloatValue(1, (F32*)val_ptr);
+	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
+	return self.mCurReadNode->getFloatValue(1, (F32*)val_ptr);
 }
 
-bool LLXUIParser::writeF32Value(const void* val_ptr, const name_stack_t& stack)
+bool LLXUIParser::writeF32Value(Parser& parser, const void* val_ptr, const name_stack_t& stack)
 {
-	LLXMLNodePtr node = getNode(stack);
+	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
+	LLXMLNodePtr node = self.getNode(stack);
 	if (node.notNull())
 	{
 		node->setFloatValue(*((F32*)val_ptr));
@@ -801,14 +833,16 @@ bool LLXUIParser::writeF32Value(const void* val_ptr, const name_stack_t& stack)
 	return false;
 }
 
-bool LLXUIParser::readF64Value(void* val_ptr)
+bool LLXUIParser::readF64Value(Parser& parser, void* val_ptr)
 {
-	return mCurReadNode->getDoubleValue(1, (F64*)val_ptr);
+	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
+	return self.mCurReadNode->getDoubleValue(1, (F64*)val_ptr);
 }
 
-bool LLXUIParser::writeF64Value(const void* val_ptr, const name_stack_t& stack)
+bool LLXUIParser::writeF64Value(Parser& parser, const void* val_ptr, const name_stack_t& stack)
 {
-	LLXMLNodePtr node = getNode(stack);
+	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
+	LLXMLNodePtr node = self.getNode(stack);
 	if (node.notNull())
 	{
 		node->setDoubleValue(*((F64*)val_ptr));
@@ -817,10 +851,11 @@ bool LLXUIParser::writeF64Value(const void* val_ptr, const name_stack_t& stack)
 	return false;
 }
 
-bool LLXUIParser::readColor4Value(void* val_ptr)
+bool LLXUIParser::readColor4Value(Parser& parser, void* val_ptr)
 {
+	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
 	LLColor4* colorp = (LLColor4*)val_ptr;
-	if(mCurReadNode->getFloatValue(4, colorp->mV) >= 3)
+	if(self.mCurReadNode->getFloatValue(4, colorp->mV) >= 3)
 	{
 		return true;
 	}
@@ -828,9 +863,10 @@ bool LLXUIParser::readColor4Value(void* val_ptr)
 	return false;
 }
 
-bool LLXUIParser::writeColor4Value(const void* val_ptr, const name_stack_t& stack)
+bool LLXUIParser::writeColor4Value(Parser& parser, const void* val_ptr, const name_stack_t& stack)
 {
-	LLXMLNodePtr node = getNode(stack);
+	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
+	LLXMLNodePtr node = self.getNode(stack);
 	if (node.notNull())
 	{
 		LLColor4 color = *((LLColor4*)val_ptr);
@@ -840,11 +876,12 @@ bool LLXUIParser::writeColor4Value(const void* val_ptr, const name_stack_t& stac
 	return false;
 }
 
-bool LLXUIParser::readUIColorValue(void* val_ptr)
+bool LLXUIParser::readUIColorValue(Parser& parser, void* val_ptr)
 {
+	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
 	LLUIColor* param = (LLUIColor*)val_ptr;
 	LLColor4 color;
-	bool success =  mCurReadNode->getFloatValue(4, color.mV) >= 3;
+	bool success =  self.mCurReadNode->getFloatValue(4, color.mV) >= 3;
 	if (success)
 	{
 		param->set(color);
@@ -853,9 +890,10 @@ bool LLXUIParser::readUIColorValue(void* val_ptr)
 	return false;
 }
 
-bool LLXUIParser::writeUIColorValue(const void* val_ptr, const name_stack_t& stack)
+bool LLXUIParser::writeUIColorValue(Parser& parser, const void* val_ptr, const name_stack_t& stack)
 {
-	LLXMLNodePtr node = getNode(stack);
+	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
+	LLXMLNodePtr node = self.getNode(stack);
 	if (node.notNull())
 	{
 		LLUIColor color = *((LLUIColor*)val_ptr);
@@ -868,11 +906,12 @@ bool LLXUIParser::writeUIColorValue(const void* val_ptr, const name_stack_t& sta
 	return false;
 }
 
-bool LLXUIParser::readUUIDValue(void* val_ptr)
+bool LLXUIParser::readUUIDValue(Parser& parser, void* val_ptr)
 {
+	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
 	LLUUID temp_id;
 	// LLUUID::set is destructive, so use temporary value
-	if (temp_id.set(mCurReadNode->getSanitizedValue()))
+	if (temp_id.set(self.mCurReadNode->getSanitizedValue()))
 	{
 		*(LLUUID*)(val_ptr) = temp_id;
 		return true;
@@ -880,9 +919,10 @@ bool LLXUIParser::readUUIDValue(void* val_ptr)
 	return false;
 }
 
-bool LLXUIParser::writeUUIDValue(const void* val_ptr, const name_stack_t& stack)
+bool LLXUIParser::writeUUIDValue(Parser& parser, const void* val_ptr, const name_stack_t& stack)
 {
-	LLXMLNodePtr node = getNode(stack);
+	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
+	LLXMLNodePtr node = self.getNode(stack);
 	if (node.notNull())
 	{
 		node->setStringValue(((LLUUID*)val_ptr)->asString());
@@ -891,15 +931,18 @@ bool LLXUIParser::writeUUIDValue(const void* val_ptr, const name_stack_t& stack)
 	return false;
 }
 
-bool LLXUIParser::readSDValue(void* val_ptr)
+bool LLXUIParser::readSDValue(Parser& parser, void* val_ptr)
 {
-	*((LLSD*)val_ptr) = LLSD(mCurReadNode->getSanitizedValue());
+	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
+	*((LLSD*)val_ptr) = LLSD(self.mCurReadNode->getSanitizedValue());
 	return true;
 }
 
-bool LLXUIParser::writeSDValue(const void* val_ptr, const name_stack_t& stack)
+bool LLXUIParser::writeSDValue(Parser& parser, const void* val_ptr, const name_stack_t& stack)
 {
-	LLXMLNodePtr node = getNode(stack);
+	LLXUIParser& self = static_cast<LLXUIParser&>(parser);
+
+	LLXMLNodePtr node = self.getNode(stack);
 	if (node.notNull())
 	{
 		std::string string_val = ((LLSD*)val_ptr)->asString();
@@ -962,3 +1005,438 @@ void LLXUIParser::parserError(const std::string& message)
 	Parser::parserError(message);
 #endif
 }
+
+
+//
+// LLSimpleXUIParser
+//
+
+struct ScopedFile
+{
+	ScopedFile( const std::string& filename, const char* accessmode )
+	{
+		mFile = LLFile::fopen(filename, accessmode);
+	}
+
+	~ScopedFile()
+	{
+		fclose(mFile);
+		mFile = NULL;
+	}
+
+	S32 getRemainingBytes()
+	{
+		if (!isOpen()) return 0;
+
+		S32 cur_pos = ftell(mFile);
+		fseek(mFile, 0L, SEEK_END);
+		S32 file_size = ftell(mFile);
+		fseek(mFile, cur_pos, SEEK_SET);
+		return file_size - cur_pos;
+	}
+
+	bool isOpen() { return mFile != NULL; }
+
+	LLFILE* mFile;
+};
+static 	LLInitParam::Parser::parser_read_func_map_t sSimpleXUIReadFuncs;
+static 	LLInitParam::Parser::parser_write_func_map_t sSimpleXUIWriteFuncs;
+static 	LLInitParam::Parser::parser_inspect_func_map_t sSimpleXUIInspectFuncs;
+
+LLSimpleXUIParser::LLSimpleXUIParser(LLSimpleXUIParser::element_start_callback_t element_cb)
+:	Parser(sSimpleXUIReadFuncs, sSimpleXUIWriteFuncs, sSimpleXUIInspectFuncs),
+	mLastWriteGeneration(-1),
+	mCurReadDepth(0),
+	mElementCB(element_cb)
+{
+	if (sSimpleXUIReadFuncs.empty())
+	{
+		registerParserFuncs<bool>(readBoolValue);
+		registerParserFuncs<std::string>(readStringValue);
+		registerParserFuncs<U8>(readU8Value);
+		registerParserFuncs<S8>(readS8Value);
+		registerParserFuncs<U16>(readU16Value);
+		registerParserFuncs<S16>(readS16Value);
+		registerParserFuncs<U32>(readU32Value);
+		registerParserFuncs<S32>(readS32Value);
+		registerParserFuncs<F32>(readF32Value);
+		registerParserFuncs<F64>(readF64Value);
+		registerParserFuncs<LLColor4>(readColor4Value);
+		registerParserFuncs<LLUIColor>(readUIColorValue);
+		registerParserFuncs<LLUUID>(readUUIDValue);
+		registerParserFuncs<LLSD>(readSDValue);
+	}
+}
+
+LLSimpleXUIParser::~LLSimpleXUIParser()
+{
+}
+
+
+bool LLSimpleXUIParser::readXUI(const std::string& filename, LLInitParam::BaseBlock& block, bool silent)
+{
+	LLFastTimer timer(FTM_PARSE_XUI);
+
+	mParser = XML_ParserCreate(NULL);
+	XML_SetUserData(mParser, this);
+	XML_SetElementHandler(			mParser,	startElementHandler, endElementHandler);
+	XML_SetCharacterDataHandler(	mParser,	characterDataHandler);
+
+	mOutputStack.push_back(std::make_pair(&block, 0));
+	mNameStack.clear();
+	mCurFileName = filename;
+	mCurReadDepth = 0;
+	setParseSilently(silent);
+
+	ScopedFile file(filename, "rb");
+	if( !file.isOpen() )
+	{
+		LL_WARNS("ReadXUI") << "Unable to open file " << filename << LL_ENDL;
+		return false;
+	}
+
+	S32 bytes_read = 0;
+	
+	S32 buffer_size = file.getRemainingBytes();
+	void* buffer = XML_GetBuffer(mParser, buffer_size);
+	if( !buffer ) 
+	{
+		LL_WARNS("ReadXUI") << "Unable to allocate XML buffer while reading file " << filename << LL_ENDL;
+		XML_ParserFree( mParser );
+		return false;
+	}
+
+	bytes_read = (S32)fread(buffer, 1, buffer_size, file.mFile);
+	if( bytes_read <= 0 )
+	{
+		LL_WARNS("ReadXUI") << "Error while reading file  " << filename << LL_ENDL;
+		XML_ParserFree( mParser );
+		return false;
+	}
+	
+	if( !XML_ParseBuffer(mParser, bytes_read, TRUE ) )
+	{
+		LL_WARNS("ReadXUI") << "Error while parsing file  " << filename << LL_ENDL;
+		XML_ParserFree( mParser );
+		return false;
+	}
+
+	XML_ParserFree( mParser );
+	return true;
+}
+
+void LLSimpleXUIParser::startElementHandler(void *userData, const char *name, const char **atts)
+{
+	LLSimpleXUIParser* self = reinterpret_cast<LLSimpleXUIParser*>(userData);
+	self->startElement(name, atts);
+}
+
+void LLSimpleXUIParser::endElementHandler(void *userData, const char *name)
+{
+	LLSimpleXUIParser* self = reinterpret_cast<LLSimpleXUIParser*>(userData);
+	self->endElement(name);
+}
+
+void LLSimpleXUIParser::characterDataHandler(void *userData, const char *s, int len)
+{
+	LLSimpleXUIParser* self = reinterpret_cast<LLSimpleXUIParser*>(userData);
+	self->characterData(s, len);
+}
+
+void LLSimpleXUIParser::startElement(const char *name, const char **atts)
+{
+	processText();
+
+	typedef boost::tokenizer<boost::char_separator<char> > tokenizer;
+	boost::char_separator<char> sep(".");
+
+	if (mElementCB) 
+	{
+		LLInitParam::BaseBlock* blockp = mElementCB(*this, name);
+		if (blockp)
+		{
+			mOutputStack.push_back(std::make_pair(blockp, 0));
+		}
+	}
+
+	mOutputStack.back().second++;
+	S32 num_tokens_pushed = 0;
+	std::string child_name(name);
+
+	if (mOutputStack.back().second == 1)
+	{	// root node for this block
+		mScope.push_back(child_name);
+	}
+	else
+	{	// compound attribute
+		if (child_name.find(".") == std::string::npos) 
+		{
+			mNameStack.push_back(std::make_pair(child_name, newParseGeneration()));
+			num_tokens_pushed++;
+			mScope.push_back(child_name);
+		}
+		else
+		{
+			// parse out "dotted" name into individual tokens
+			tokenizer name_tokens(child_name, sep);
+
+			tokenizer::iterator name_token_it = name_tokens.begin();
+			if(name_token_it == name_tokens.end()) 
+			{
+				return;
+			}
+
+			// check for proper nesting
+			if(!mScope.empty() && *name_token_it != mScope.back())
+			{
+				return;
+			}
+
+			// now ignore first token
+			++name_token_it; 
+
+			// copy remaining tokens on to our running token list
+			for(tokenizer::iterator token_to_push = name_token_it; token_to_push != name_tokens.end(); ++token_to_push)
+			{
+				mNameStack.push_back(std::make_pair(*token_to_push, newParseGeneration()));
+				num_tokens_pushed++;
+			}
+			mScope.push_back(mNameStack.back().first);
+		}
+	}
+
+	mTokenSizeStack.push_back(num_tokens_pushed);
+	readAttributes(atts);
+}
+
+bool LLSimpleXUIParser::readAttributes(const char **atts)
+{
+	typedef boost::tokenizer<boost::char_separator<char> > tokenizer;
+	boost::char_separator<char> sep(".");
+
+	bool any_parsed = false;
+	for(S32 i = 0; atts[i] && atts[i+1]; i += 2 )
+	{
+		std::string attribute_name(atts[i]);
+		mCurAttributeValueBegin = atts[i+1];
+		
+		S32 num_tokens_pushed = 0;
+		tokenizer name_tokens(attribute_name, sep);
+		// copy remaining tokens on to our running token list
+		for(tokenizer::iterator token_to_push = name_tokens.begin(); token_to_push != name_tokens.end(); ++token_to_push)
+		{
+			mNameStack.push_back(std::make_pair(*token_to_push, newParseGeneration()));
+			num_tokens_pushed++;
+		}
+
+		// child nodes are not necessarily valid attributes, so don't complain once we've recursed
+		any_parsed |= mOutputStack.back().first->submitValue(mNameStack, *this, mParseSilently);
+		
+		while(num_tokens_pushed-- > 0)
+		{
+			mNameStack.pop_back();
+		}
+	}
+	return any_parsed;
+}
+
+void LLSimpleXUIParser::processText()
+{
+	if (!mTextContents.empty())
+	{
+		LLStringUtil::trim(mTextContents);
+		if (!mTextContents.empty())
+		{
+			mNameStack.push_back(std::make_pair(std::string("value"), newParseGeneration()));
+			mCurAttributeValueBegin = mTextContents.c_str();
+			mOutputStack.back().first->submitValue(mNameStack, *this, mParseSilently);
+			mNameStack.pop_back();
+		}
+		mTextContents.clear();
+	}
+}
+
+void LLSimpleXUIParser::endElement(const char *name)
+{
+	processText();
+
+	if (--mOutputStack.back().second == 0)
+	{
+		if (mOutputStack.empty())
+		{
+			LL_ERRS("ReadXUI") << "Parameter block output stack popped while empty." << LL_ENDL;
+		}
+		mOutputStack.pop_back();
+	}
+
+	S32 num_tokens_to_pop = mTokenSizeStack.back();
+	mTokenSizeStack.pop_back();
+	while(num_tokens_to_pop-- > 0)
+	{
+		mNameStack.pop_back();
+	}
+	mScope.pop_back();
+}
+
+void LLSimpleXUIParser::characterData(const char *s, int len)
+{
+	mTextContents += std::string(s, len);
+}
+
+
+/*virtual*/ std::string LLSimpleXUIParser::getCurrentElementName()
+{
+	std::string full_name;
+	for (name_stack_t::iterator it = mNameStack.begin();	
+		it != mNameStack.end();
+		++it)
+	{
+		full_name += it->first + "."; // build up dotted names: "button.param.nestedparam."
+	}
+
+	return full_name;
+}
+
+const S32 LINE_NUMBER_HERE = 0;
+
+void LLSimpleXUIParser::parserWarning(const std::string& message)
+{
+#ifdef LL_WINDOWS
+	// use Visual Studo friendly formatting of output message for easy access to originating xml
+	llutf16string utf16str = utf8str_to_utf16str(llformat("%s(%d):\t%s", mCurFileName.c_str(), LINE_NUMBER_HERE, message.c_str()).c_str());
+	utf16str += '\n';
+	OutputDebugString(utf16str.c_str());
+#else
+	Parser::parserWarning(message);
+#endif
+}
+
+void LLSimpleXUIParser::parserError(const std::string& message)
+{
+#ifdef LL_WINDOWS
+	llutf16string utf16str = utf8str_to_utf16str(llformat("%s(%d):\t%s", mCurFileName.c_str(), LINE_NUMBER_HERE, message.c_str()).c_str());
+	utf16str += '\n';
+	OutputDebugString(utf16str.c_str());
+#else
+	Parser::parserError(message);
+#endif
+}
+
+bool LLSimpleXUIParser::readBoolValue(Parser& parser, void* val_ptr)
+{
+	LLSimpleXUIParser& self = static_cast<LLSimpleXUIParser&>(parser);
+	if (!strcmp(self.mCurAttributeValueBegin, "true")) 
+	{
+		*((bool*)val_ptr) = true;
+		return true;
+	}
+	else if (!strcmp(self.mCurAttributeValueBegin, "false"))
+	{
+		*((bool*)val_ptr) = false;
+		return true;
+	}
+
+	return false;
+}
+
+bool LLSimpleXUIParser::readStringValue(Parser& parser, void* val_ptr)
+{
+	LLSimpleXUIParser& self = static_cast<LLSimpleXUIParser&>(parser);
+	*((std::string*)val_ptr) = self.mCurAttributeValueBegin;
+	return true;
+}
+
+bool LLSimpleXUIParser::readU8Value(Parser& parser, void* val_ptr)
+{
+	LLSimpleXUIParser& self = static_cast<LLSimpleXUIParser&>(parser);
+	return parse(self.mCurAttributeValueBegin, uint_p[assign_a(*(U8*)val_ptr)]).full;
+}
+
+bool LLSimpleXUIParser::readS8Value(Parser& parser, void* val_ptr)
+{
+	LLSimpleXUIParser& self = static_cast<LLSimpleXUIParser&>(parser);
+	return parse(self.mCurAttributeValueBegin, int_p[assign_a(*(S8*)val_ptr)]).full;
+}
+
+bool LLSimpleXUIParser::readU16Value(Parser& parser, void* val_ptr)
+{
+	LLSimpleXUIParser& self = static_cast<LLSimpleXUIParser&>(parser);
+	return parse(self.mCurAttributeValueBegin, uint_p[assign_a(*(U16*)val_ptr)]).full;
+}
+
+bool LLSimpleXUIParser::readS16Value(Parser& parser, void* val_ptr)
+{
+	LLSimpleXUIParser& self = static_cast<LLSimpleXUIParser&>(parser);
+	return parse(self.mCurAttributeValueBegin, int_p[assign_a(*(S16*)val_ptr)]).full;
+}
+
+bool LLSimpleXUIParser::readU32Value(Parser& parser, void* val_ptr)
+{
+	LLSimpleXUIParser& self = static_cast<LLSimpleXUIParser&>(parser);
+	return parse(self.mCurAttributeValueBegin, uint_p[assign_a(*(U32*)val_ptr)]).full;
+}
+
+bool LLSimpleXUIParser::readS32Value(Parser& parser, void* val_ptr)
+{
+	LLSimpleXUIParser& self = static_cast<LLSimpleXUIParser&>(parser);
+	return parse(self.mCurAttributeValueBegin, int_p[assign_a(*(S32*)val_ptr)]).full;
+}
+
+bool LLSimpleXUIParser::readF32Value(Parser& parser, void* val_ptr)
+{
+	LLSimpleXUIParser& self = static_cast<LLSimpleXUIParser&>(parser);
+	return parse(self.mCurAttributeValueBegin, real_p[assign_a(*(F32*)val_ptr)]).full;
+}
+
+bool LLSimpleXUIParser::readF64Value(Parser& parser, void* val_ptr)
+{
+	LLSimpleXUIParser& self = static_cast<LLSimpleXUIParser&>(parser);
+	return parse(self.mCurAttributeValueBegin, real_p[assign_a(*(F64*)val_ptr)]).full;
+}
+	
+bool LLSimpleXUIParser::readColor4Value(Parser& parser, void* val_ptr)
+{
+	LLSimpleXUIParser& self = static_cast<LLSimpleXUIParser&>(parser);
+	LLColor4 value;
+
+	if (parse(self.mCurAttributeValueBegin, real_p[assign_a(value.mV[0])] >> real_p[assign_a(value.mV[1])] >> real_p[assign_a(value.mV[2])] >> real_p[assign_a(value.mV[3])], space_p).full)
+	{
+		*(LLColor4*)(val_ptr) = value;
+		return true;
+	}
+	return false;
+}
+
+bool LLSimpleXUIParser::readUIColorValue(Parser& parser, void* val_ptr)
+{
+	LLSimpleXUIParser& self = static_cast<LLSimpleXUIParser&>(parser);
+	LLColor4 value;
+	LLUIColor* colorp = (LLUIColor*)val_ptr;
+
+	if (parse(self.mCurAttributeValueBegin, real_p[assign_a(value.mV[0])] >> real_p[assign_a(value.mV[1])] >> real_p[assign_a(value.mV[2])] >> real_p[assign_a(value.mV[3])], space_p).full)
+	{
+		colorp->set(value);
+		return true;
+	}
+	return false;
+}
+
+bool LLSimpleXUIParser::readUUIDValue(Parser& parser, void* val_ptr)
+{
+	LLSimpleXUIParser& self = static_cast<LLSimpleXUIParser&>(parser);
+	LLUUID temp_id;
+	// LLUUID::set is destructive, so use temporary value
+	if (temp_id.set(std::string(self.mCurAttributeValueBegin)))
+	{
+		*(LLUUID*)(val_ptr) = temp_id;
+		return true;
+	}
+	return false;
+}
+
+bool LLSimpleXUIParser::readSDValue(Parser& parser, void* val_ptr)
+{
+	LLSimpleXUIParser& self = static_cast<LLSimpleXUIParser&>(parser);
+	*((LLSD*)val_ptr) = LLSD(self.mCurAttributeValueBegin);
+	return true;
+}
diff --git a/indra/llxuixml/llxuiparser.h b/indra/llxuixml/llxuiparser.h
index 30b7e8c356..5c613b0c69 100644
--- a/indra/llxuixml/llxuiparser.h
+++ b/indra/llxuixml/llxuiparser.h
@@ -96,14 +96,12 @@ public:
 
 
 
-class LLXUIParser : public LLInitParam::Parser, public LLSingleton<LLXUIParser>
+class LLXUIParser : public LLInitParam::Parser
 {
 LOG_CLASS(LLXUIParser);
 
-protected:
-	LLXUIParser();
-	friend class LLSingleton<LLXUIParser>;
 public:
+	LLXUIParser();
 	typedef LLInitParam::Parser::name_stack_t name_stack_t;
 
 	/*virtual*/ std::string getCurrentElementName();
@@ -114,42 +112,40 @@ public:
 	void writeXUI(LLXMLNodePtr node, const LLInitParam::BaseBlock& block, const LLInitParam::BaseBlock* diff_block = NULL);
 
 private:
-	typedef std::list<std::pair<std::string, bool> >	token_list_t;
-
-	bool readXUIImpl(LLXMLNodePtr node, const std::string& scope, LLInitParam::BaseBlock& block);
+	bool readXUIImpl(LLXMLNodePtr node, LLInitParam::BaseBlock& block);
 	bool readAttributes(LLXMLNodePtr nodep, LLInitParam::BaseBlock& block);
 
 	//reader helper functions
-	bool readBoolValue(void* val_ptr);
-	bool readStringValue(void* val_ptr);
-	bool readU8Value(void* val_ptr);
-	bool readS8Value(void* val_ptr);
-	bool readU16Value(void* val_ptr);
-	bool readS16Value(void* val_ptr);
-	bool readU32Value(void* val_ptr);
-	bool readS32Value(void* val_ptr);
-	bool readF32Value(void* val_ptr);
-	bool readF64Value(void* val_ptr);
-	bool readColor4Value(void* val_ptr);
-	bool readUIColorValue(void* val_ptr);
-	bool readUUIDValue(void* val_ptr);
-	bool readSDValue(void* val_ptr);
+	static bool readBoolValue(Parser& parser, void* val_ptr);
+	static bool readStringValue(Parser& parser, void* val_ptr);
+	static bool readU8Value(Parser& parser, void* val_ptr);
+	static bool readS8Value(Parser& parser, void* val_ptr);
+	static bool readU16Value(Parser& parser, void* val_ptr);
+	static bool readS16Value(Parser& parser, void* val_ptr);
+	static bool readU32Value(Parser& parser, void* val_ptr);
+	static bool readS32Value(Parser& parser, void* val_ptr);
+	static bool readF32Value(Parser& parser, void* val_ptr);
+	static bool readF64Value(Parser& parser, void* val_ptr);
+	static bool readColor4Value(Parser& parser, void* val_ptr);
+	static bool readUIColorValue(Parser& parser, void* val_ptr);
+	static bool readUUIDValue(Parser& parser, void* val_ptr);
+	static bool readSDValue(Parser& parser, void* val_ptr);
 
 	//writer helper functions
-	bool writeBoolValue(const void* val_ptr, const name_stack_t&);
-	bool writeStringValue(const void* val_ptr, const name_stack_t&);
-	bool writeU8Value(const void* val_ptr, const name_stack_t&);
-	bool writeS8Value(const void* val_ptr, const name_stack_t&);
-	bool writeU16Value(const void* val_ptr, const name_stack_t&);
-	bool writeS16Value(const void* val_ptr, const name_stack_t&);
-	bool writeU32Value(const void* val_ptr, const name_stack_t&);
-	bool writeS32Value(const void* val_ptr, const name_stack_t&);
-	bool writeF32Value(const void* val_ptr, const name_stack_t&);
-	bool writeF64Value(const void* val_ptr, const name_stack_t&);
-	bool writeColor4Value(const void* val_ptr, const name_stack_t&);
-	bool writeUIColorValue(const void* val_ptr, const name_stack_t&);
-	bool writeUUIDValue(const void* val_ptr, const name_stack_t&);
-	bool writeSDValue(const void* val_ptr, const name_stack_t&);
+	static bool writeBoolValue(Parser& parser, const void* val_ptr, const name_stack_t&);
+	static bool writeStringValue(Parser& parser, const void* val_ptr, const name_stack_t&);
+	static bool writeU8Value(Parser& parser, const void* val_ptr, const name_stack_t&);
+	static bool writeS8Value(Parser& parser, const void* val_ptr, const name_stack_t&);
+	static bool writeU16Value(Parser& parser, const void* val_ptr, const name_stack_t&);
+	static bool writeS16Value(Parser& parser, const void* val_ptr, const name_stack_t&);
+	static bool writeU32Value(Parser& parser, const void* val_ptr, const name_stack_t&);
+	static bool writeS32Value(Parser& parser, const void* val_ptr, const name_stack_t&);
+	static bool writeF32Value(Parser& parser, const void* val_ptr, const name_stack_t&);
+	static bool writeF64Value(Parser& parser, const void* val_ptr, const name_stack_t&);
+	static bool writeColor4Value(Parser& parser, const void* val_ptr, const name_stack_t&);
+	static bool writeUIColorValue(Parser& parser, const void* val_ptr, const name_stack_t&);
+	static bool writeUUIDValue(Parser& parser, const void* val_ptr, const name_stack_t&);
+	static bool writeSDValue(Parser& parser, const void* val_ptr, const name_stack_t&);
 
 	LLXMLNodePtr getNode(const name_stack_t& stack);
 
@@ -165,6 +161,78 @@ private:
 	LLXMLNodePtr					mLastWrittenChild;
 	S32								mCurReadDepth;
 	std::string						mCurFileName;
+	std::string						mRootNodeName;
+};
+
+// LLSimpleXUIParser is a streamlined SAX-based XUI parser that does not support localization 
+// or parsing of a tree of independent param blocks, such as child widgets.
+// Use this for reading non-localized files that only need a single param block as a result.
+//
+// NOTE: In order to support nested block parsing, we need callbacks for start element that
+// push new blocks contexts on the mScope stack.
+// NOTE: To support localization without building a DOM, we need to enforce consistent 
+// ordering of child elements from base file to localized diff file.  Then we can use a pair
+// of coroutines to perform matching of xml nodes during parsing.  Not sure if the overhead
+// of coroutines would offset the gain from SAX parsing
+
+class LLSimpleXUIParser : public LLInitParam::Parser
+{
+LOG_CLASS(LLSimpleXUIParser);
+public:
+	typedef LLInitParam::Parser::name_stack_t name_stack_t;
+	typedef LLInitParam::BaseBlock* (*element_start_callback_t)(LLSimpleXUIParser&, const char* block_name);
+
+	LLSimpleXUIParser(element_start_callback_t element_cb = NULL);
+	virtual ~LLSimpleXUIParser();
+
+	/*virtual*/ std::string getCurrentElementName();
+	/*virtual*/ void parserWarning(const std::string& message);
+	/*virtual*/ void parserError(const std::string& message);
+
+	bool readXUI(const std::string& filename, LLInitParam::BaseBlock& block, bool silent=false);
+
+
+private:
+	//reader helper functions
+	static bool readBoolValue(Parser&, void* val_ptr);
+	static bool readStringValue(Parser&, void* val_ptr);
+	static bool readU8Value(Parser&, void* val_ptr);
+	static bool readS8Value(Parser&, void* val_ptr);
+	static bool readU16Value(Parser&, void* val_ptr);
+	static bool readS16Value(Parser&, void* val_ptr);
+	static bool readU32Value(Parser&, void* val_ptr);
+	static bool readS32Value(Parser&, void* val_ptr);
+	static bool readF32Value(Parser&, void* val_ptr);
+	static bool readF64Value(Parser&, void* val_ptr);
+	static bool readColor4Value(Parser&, void* val_ptr);
+	static bool readUIColorValue(Parser&, void* val_ptr);
+	static bool readUUIDValue(Parser&, void* val_ptr);
+	static bool readSDValue(Parser&, void* val_ptr);
+
+private:
+	static void startElementHandler(void *userData, const char *name, const char **atts);
+	static void endElementHandler(void *userData, const char *name);
+	static void characterDataHandler(void *userData, const char *s, int len);
+
+	void startElement(const char *name, const char **atts);
+	void endElement(const char *name);
+	void characterData(const char *s, int len);
+	bool readAttributes(const char **atts);
+	void processText();
+
+	Parser::name_stack_t			mNameStack;
+	struct XML_ParserStruct*		mParser;
+	S32								mLastWriteGeneration;
+	LLXMLNodePtr					mLastWrittenChild;
+	S32								mCurReadDepth;
+	std::string						mCurFileName;
+	std::string						mTextContents;
+	const char*						mCurAttributeValueBegin;
+	std::vector<S32>				mTokenSizeStack;
+	std::vector<std::string>		mScope;
+	element_start_callback_t		mElementCB;
+
+	std::vector<std::pair<LLInitParam::BaseBlock*, S32> > mOutputStack;
 };