CS453 Intro and PA1 1CS453 Lecture Building LR Parse Tables 1Plan for Today Building the LR Parsing Table for LR(0)– items, closure, and goto, oh my!– why does it need to know input token if LR(0)?CS453 Lecture Building LR Parse Tables 2Example LR Parse Table(1) S -> S ( S )(2) S -> epsilonr1r1r14s4s233r2r2r22accepts211r2r2r20S$)(StateGotoActionCS453 Lecture Building LR Parse Tables 3Building the LR Parse Table for LR(0)(0) S’ -> S $(1) S -> S ( S )(2) S -> εCS453 Lecture Building LR Parse Tables 4LR(0) states for nested parens exampleCS453 Intro and PA1 2CS453 Lecture Building LR Parse Tables 5Building the Tabler1r1r14s4s233r2r2r22accepts211r2r2r20S$)(StateGotoActionCS453 Lecture Building LR Parse Tables 6Pushdown Automata for GrammarCS453 Lecture Building LR Parse Tables 7Building the LR Parse Table for LR(0), another example(0) S’ -> E $(1) E -> E ‘||’ B(2) E -> B(3) B -> t(4) B ->
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