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What about empty rules?

asked in Compiler Design by Junior (581 points)   | 32 views
for that we need to find follow sets also and then check conflicts. But here they have not considered that.

For LL(1)

No ambiguity
o No left recursion
o A grammar G is LL(1) iff whenever A –> u | v are two distinct productions of G, the
following conditions hold:
o for no terminal a do both u and v derive strings beginning with a (i.e., first
sets are disjoint)
o at most one of u and v can derive the empty string
o if v =>* ε then u does not derive any string beginning with a terminal in
Follow(A) (i.e., first and follow must be disjoint if nullable)
tnx...I got your point regarding empty rules but they haven't mentioned anything about empty rules so how we can assume empty rules won't make conflicts as follow(X) may conflict with any rule.

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