CODEWITHSUNDEEP
c++parsingbisonlexflex-lexer
Unarelith
Unarelith

Reputation: 495

Flex/Bison: Bad token management?

I've a problem in my lexer and in my parser.

First, in my lexer I've a line like that:

"if"    beginScope(stOTHER); return IF;

And in my parser:

stmt: IF '(' exp ')' stmts
...
stmts: stmt
       | '{' stmt_list '}'
       | '{' '}'

In a code like that:

if(sth) {
    dosth;
}

if(other) {
    doothersth;
}

beginScope will be called two times, because ( I think ) Bison don't know where is the end of the if statement, so when it found the IF token, he takes that as the end of the if statement, and read it a second time to start the other if statement...

Please help me...

Upvotes: 5

Views: 339

Answers (1)

vitaut
vitaut

Reputation: 55524

As Zack mentioned in the comments, you should call beginScope from a parser action:

stmt: IF { beginScope(stOTHER); } '(' exp ')' stmts

Upvotes: 1

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