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Express Learning: Principles of Compiler Design by ITL Education Solutions Limited

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5

LR Parsers

1. Explain LR parsers. What are its components?

Ans: LR parsers are efficient bottom-up parsers for a large class of context-free grammars. An LR parser is a non-backtracking shift-reduce parser in which ‘L’ indicates that they scan input from left to right and ‘R’ indicates that they construct a rightmost derivation in reverse. LR parsing is a method for syntactic recognition of programming languages. It makes use of tables to determine when a rule is complete and which additional tokens must be read from the source string. The term LR(k) can also be used to represent LR parser, where k indicates the number of input symbols of lookahead that are used in making parsing decision. Only the cases where the value of k is either ...

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