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Asked: 2026-06-15T20:19:54+00:00

I am asking for gplex , however it might be the case, the solution

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I am asking for gplex, however it might be the case, the solution to the problem works for other lex-derived tools.

I wrote all rules, everything is fine with one exception. The type of the scan method of the generated scanner is int, and I would like to be MySymbol (which would consist of id of the token — INT, STR, PLUS, so on, its value, and possible location in the file).

I checked the samples (not many of them), but they are very simplistic and just write out the fact rule was matched, I’ve read the manual, but it starts from parser perspective and for now I am a bit lost.

One of my rules in lex file:

while { return new MySymbol(MyTokens.WHILE); }

All I have now is scanning phase, I have to finish it, and then I will think about parser.

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1 Answer

  1. Editorial Team

    Yacc and Yacc-like tools (here GPLex) relies on side effect. Normally you could think of returning the data, but here you are returning token id, and any extra data has to be “passed” via special variables like yyval.

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