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Removing Left Recursion from Context-Free Grammars

By Robert Moore


context-free grammars (CFGs) in a "topdown " left-to-right fashion is that left recursion can lead to nontermination. An algorithm is known that transforms any CFG into an equivalent nonleft -recursive CFG, but the resulting grammars are often too large for practical use. We present a new method for removing left recursion from CFGs that is both theoretically superior to the standard algorithm, and produces very compact non-left-recursive CFGs in practice

Year: 2000
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