[antlr-interest] Returning from a sub-parser with no end token.

[Terence Parr]

On Friday, December 28, 2001, at 01:50  AM, Remi Koutcherawy wrote:

> OK, looking at the generated code, I found a solution.
> Rather simple, just four added lines of code, works well even with AST.
>
> Nevertheless I feel awkward to reference "parse_AST" which is a 
> variable in the generated code not
> declared in the grammar, clumsy also to throw an exception and catch 
> another ;-)
>
> Any other idea ?
> Albeit modifying the generator to add a new option to generate such a 
> behavior can be considered.
>
I don't see what code you added...

basically if you make a sentinel token optional a lexer has a problem 
switching back to another lexer.  It has to get a token to test it (to 
see if it's BBB), right?  If not BBB then it is incorrectly accessing 
the stream of chars associated with the other lexer.

Ter


 

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