lex and yacc parsing question

Heloo,


I have an issue in lex and yacc.


Suppose I have written a grammer.


Now I have an input file :


1. always(@posedge clk1)
2. // check syntax below but do not populate the code
3. q = d1;
4. always(@posedge clk2)
5. // check syntax below and also populate the code
6. q1 = d2;


I expect my lex and yacc to perform syntax checking on the full code
but populate only the code above and below the comment line.


i.e. I want in the object model :
1. always(@posedge clk1)
6. q1 = d2;


If I stop sending the tokens to yacc pf the code within the comment
line,, then I can not do syntax checking on that code.


If I return the tokens of the culprit code to yacc but do not populate
it, the line 6 will not get associated with always block in line 1.


Please some one help me do this in one pass of yacc.


Is there any way in which I can make yacc remember its state till line
no. 1 and then again start from the same states on reaching line
number 6. for line number 2 to 5 , i want yacc to create new states
and discard them on reaching line number 6
[Parse the whole thing, set a flag that tells you when to generate code.
-John]

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