Sorry, I’m not sure what the proper lingo is, so the subject may not make sense.
In my BASIC interpreter’s bison code I have one of these:
|
CHANGE variable TO variable
{
statement_t *new = make_statement(CHANGE);
new->parms.change.var1 = $2;
new->parms.change.var2 = $4;
$$ = new;
}
CHANGE is from the original Dartmouth BASIC. It turns out that HP included an
identical feature in their dialect, CONVERT. So I did:
|
CONVERT variable TO variable
{
statement_t *new = make_statement(CONVERT);
new->parms.change.var1 = $2;
new->parms.change.var2 = $4;
$$ = new;
}
Works great.
My question is whether there is a simple way to combine the two to eliminate
the duplicated code? These sorts of synonyms are not uncommon across different
dialects. I tried what seemed obvious:
|
CONVERT variable TO variable
|
CHANGE variable TO variable
… and simply using the CHANGE token, but this resulted in the convert statement
being empty.
Is there an easy way to do this?
If so, can I “save” the correct token in the make_statement?
