FIlename is now remembered and used by save. Save as added.

sqlhighlighter.cpp

@@ -11,6 +11,27 @@ static const wchar_t *operators[] = {
 };
 
 
+/*
+
+   + - * / < > = ~ ! @ # % ^ & | ` ?
+
+There are a few restrictions on your choice of name:
+
+	-- and /* cannot appear anywhere in an operator name, since they will be taken as the start of a comment.
+
+	A multicharacter operator name cannot end in + or -, unless the name also contains at least one of these characters:
+
+	~ ! @ # % ^ & | ` ?
+	For example, @- is an allowed operator name, but *- is not. This restriction allows PostgreSQL to parse SQL-compliant commands without requiring spaces between tokens.
+
+	The use of => as an operator name is deprecated. It may be disallowed altogether in a future release.
+
+The operator != is mapped to <> on input, so these two names are always equivalent.
+
++ - * / < > =
+
+*/
+
 //static auto types = R"-(bigint|boolean|char|character varying|date|int[248]|integer|numeric|smallint|time|timestamp(?:tz)?|timestamp(?:\s+with\s+timezone)?|varchar)-";
 //static auto err = R"-(left|right|inner|outer)-";