![]() The LR parser, which is parsed by the grammar, is itself the subset of the grammar parsed by LL or Predictive parser.ĭifference Between LL and LR Parser LL Parser.LR parser can easily detect any error at the time of scanning the input when required.The Non–backtracking shift-reduce parser is one of the most preferred LR Parser, which can be implemented in the same way as other primitive shift-reduce parsers.There also exist some non – LR CFG, but in that case, the programming language will avoid the non – LR context-free – grammar. For any programming language construct, if we are able to write a context-free – grammar, then the LR parser will recognize such kind of programming language.The lookahead helps in making parsing decisions. The LR parser uses the lookahead input symbol, which is represented by K in LR(K) parser. ![]() However, the R in the LR() parser constructs the rightmost derivation in the reverse order. The LR() parser scans the input from left – to – right, which is the actual abbreviation of L in the LR(K) parser. The most popular type of bottom-up parsing is LR(K) parsing.
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