Question in Flex (parser)
- by shkk
Hello... I want to ask you a question about Flex, the program for parsing code.
Supposing I have an instruction like this one, in the rules part:
"=" BEGIN(attribution);
<attribution>{var_name} { fprintf(yyout, "="); ECHO; }
<attribution>";" BEGIN(INITIAL);
{var_name} is a regular expression that matches a variable's name, and all I want to do is to copy at the output all the attribution instructions, such as
a = 3;
or
b = a;
My rule though cannot write with fprintf the left member of the attribution, but only
= 3;
or
=a;
One solution for that might be that, after I make the match "=" and I am in the attribution state, to go 2 positions back as to get the left operand as well.
How can I do that in Flex?
