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To construct the LR(1) parse table: • Construct a dfa to model the top of the stack. • Using the dfa, construct an LR(1) parse table. To Construct the DFA. • Add S’
Construction of SLR parsing table –. Construct C = { I0, I1, . In}, the collection of sets of LR(0) items for G’. State i is constructed from Ii. The parsing actions
3 May 2015
By the end of this lecture you should be able to: 1 Identify LR(1) items. 2 Construct an LR(1) automaton for a CFG. 3 Construct the LR(1) parsing table for a CFG.
LR(1) table construction algorithm. 1. build I LR(1) parser example. The Grammar. 1 E. ::= T + E. 2 j T. 3 T. ::= id . 1. Construct kernels of LR(0) sets of items. 2.
Form I1-I4 by moving the dot past the first symbol in each rule. • This means moving the dot past S, A, E, id. I1 := Closure { [S’> S ., $], [S > S . ; A, $], [S > S . ; A,
basic idea: first construct DFA to recognize handles, then use DFA to construct the parsing tables ! different parsing table yield different LR parsers SLR(1),.Building LR(1) itemsets, LR(1) and LALR parse tables. A, S, X: non-terminals x,y, ?, ?: string of terminals and/or non-terminals. C: one terminal or one non-
LR(1) items. The LR(1) table construction algorithm uses LR(1) items to represent valid [A >??•,a] means that the parser has seen ??, and that a lookahead symbol of a is . Repeatedly construct new states, until all are found. The algorithm.
If a ) comes next then the parse is going great! Now reduce, using .. Algorithm to construct CC, the Canonical Collection of LR(1) Items: let CC0 = CLOSURE

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