logic: preselecting SearchNodes for autocompletion by prefiltering the Graph with the entered Query

This change only shows matches in the autocompletion list that are prefiltered by the already entered query. The
autocompletion now also shows up after an operator of type . or > has been entered to show an alphabetical list of
possible tokens.

src/lib/utility/messaging/type/MessageSearchAutocomplete.h

@@ -7,8 +7,9 @@
 class MessageSearchAutocomplete: public Message<MessageSearchAutocomplete>
 {
 public:
-	MessageSearchAutocomplete(const std::string& query)
+	MessageSearchAutocomplete(const std::string& query, const std::string& word)
 		: query(query)
+		, word(word)
 	{
 	}
 
@@ -18,6 +19,7 @@ public:
 	}
 
 	const std::string query;
+	const std::string word;
 };
 
 #endif // MESSAGE_SEARCH_AUTOCOMPLETE_H

src/lib/utility/utilityString.cpp

@@ -120,7 +120,7 @@ namespace utility
 	{
 		if (a.size() == b.size())
 		{
-			for (int i = 0; i < a.size(); i++)
+			for (size_t i = 0; i < a.size(); i++)
 			{
 				if (tolower(a[i]) != tolower(b[i]))
 				{
@@ -131,4 +131,22 @@ namespace utility
 		}
 		return false;
 	}
+
+	std::string replace(std::string str, const std::string& from, const std::string& to)
+	{
+		size_t pos = 0;
+
+		if (from.size() == 0)
+		{
+			return str;
+		}
+
+		while ((pos = str.find(from, pos)) != std::string::npos)
+		{
+			str.replace(pos, from.length(), to);
+			pos += to.length();
+		}
+
+		return str;
+	}
 }

src/lib/utility/utilityString.h

@@ -35,6 +35,8 @@ namespace utility
 
 	bool equalsCaseInsensitive(const std::string& a, const std::string& b);
 
+	std::string replace(std::string str, const std::string& from, const std::string& to);
+
 
 	template <typename ContainerType>
 	ContainerType split(const std::string& str, const std::string& delimiter)