Function ResolveReference

trinity/Tr2DynamicBinding.cpp:115–169

}

IRoot* ResolveReference( const std::string& reference, const std::unordered_map<std::string, IRoot*>& roots )
{
	if( reference.empty() )
	{
		return nullptr;
	}

	static const std::regex tokens( "((\\.[a-zA-Z_][a-zA-Z_0-9]*)|(\\[-?[0-9]+\\])|(\\[\"[^\"]*\"\\])).*" );
	static const std::regex root( "([a-zA-Z_][a-zA-Z_0-9]*).*" );

	auto start = begin( reference );
	auto finish = end( reference );
	std::smatch match;
	if( !std::regex_match( start, finish, match, root ) )
	{
		return nullptr;
	}
	auto found = roots.find( match[1].str() );
	if( found == roots.end() )
	{
		return nullptr;
	}
	auto object = found->second;
	start += match[1].length();

	while( object && start != finish )
	{
		if( !std::regex_match( start, finish, match, tokens ) )
		{
			return nullptr;
		}
		if( match[2].length() )
		{
			auto attrName = match[2].str().substr( 1 );
			object = GetIRootAttribute( object, attrName );
		}
		else if( match[3].length() )
		{
			auto index = std::atoi( match[3].str().c_str() + 1 );
			object = GetListElement( object, ssize_t( index ) );
		}
		else if( match[4].length() )
		{
			auto name = match[4].str();
			name = name.substr( 2, name.length() - 4 );
			object = GetListElement( object, name );
		}
		else
		{
			object = nullptr;
		}
		start += match[1].length();
	}
	return object;
}
}