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Properties of LL(1)

Properties of LL(1). No ambiguous or left recursive grammar can be LL(1). Grammar G is LL(1) iff whenever A   |  are two distinct productions of G and: For no terminal a do both  and  derive strings beginning with a . FIRST(  )FIRST()=

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Properties of LL(1)

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  1. Properties of LL(1) • No ambiguous or left recursive grammar can be LL(1). • Grammar G is LL(1) iff whenever A| are two distinct productions of G and: • For no terminal a do both  and  derive strings beginning with a. FIRST()FIRST()= • At most one of  and  can derive the empty string. • If , the  does not derive any string beginning with a terminal in FOLLOW(A). FIRST(FOLLOW(A))FIRST(FOLLOW(A))= *

  2. LL(1) Grammars: Example

  3. Non-LL(1) Grammar: Example

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