Parser – Errors (Exceptions)

One C++ feature not currently being used are exceptions (though exceptions were used a while back for table initialization, but this code was removed when this initialization was redesigned).  The Qt library functions do not use (throw) exceptions, but the Standard Template Library (STL) functions can.

It is possible that exceptions could be used by the parser to throw exceptions for parser errors, which fall under two types, errors with constants (six of them related to incorrectly formed numbers or numbers out of range) and unrecognizable characters.  Exceptions may also be able to be used for translator errors, but this will be considered later when the Translator class undergoes improvements.

The handling of parser errors was recently redesigned (see post), where the goal was to remove the dependency on the Qt translations functions for the error messages.  This design still requires the caller to ask the parser for the error status code when it sees that the last token returned has an error.  Before adding exceptions, some additional improvements can be made to the Parser class that will simplify the use of exceptions.