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  2. Removing left recursion - Wikipedia

    en.wikipedia.org/wiki/Left_recursion

    A formal grammar that contains left recursion cannot be parsed by a LL(k)-parser or other naive recursive descent parser unless it is converted to a weakly equivalent right-recursive form. In contrast, left recursion is preferred for LALR parsers because it results in lower stack usage than right recursion.

  3. LL parser - Wikipedia

    en.wikipedia.org/wiki/LL_parser

    For a general method, see removing left recursion. A simple example for left recursion removal: The following production rule has left recursion on E E -> E '+' T E -> T This rule is nothing but list of Ts separated by '+'. In a regular expression form T ('+' T)*. So the rule could be rewritten as E -> T Z Z -> '+' T Z Z -> ε Now there is no ...

  4. Recursive grammar - Wikipedia

    en.wikipedia.org/wiki/Recursive_grammar

    For example, a grammar for a context-free language is left recursive if there exists a non-terminal symbol A that can be put through the production rules to produce a string with A (as the leftmost symbol). [2] [3] All types of grammars in the Chomsky hierarchy can be recursive and it is recursion that allows the production of infinite sets of ...

  5. Recursive descent parser - Wikipedia

    en.wikipedia.org/wiki/Recursive_descent_parser

    Any context-free grammar can be transformed into an equivalent grammar that has no left recursion, but removal of left recursion does not always yield an LL(k) grammar. A predictive parser runs in linear time. Recursive descent with backtracking is a technique that determines which production to use by trying

  6. LL grammar - Wikipedia

    en.wikipedia.org/wiki/LL_grammar

    An LL(1) grammar with symbols that have only the empty derivation may or may not be LALR(1). [9] LL grammars cannot have rules containing left recursion. [10] Each LL(k) grammar that is ε-free can be transformed into an equivalent LL(k) grammar in Greibach normal form (which by definition does not have rules with left recursion). [11]

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    The mandate to remove pronouns from email signatures is the latest result of the Trump administration's push to do away with diversity and equity efforts in the federal government.

  8. Talk:Left recursion - Wikipedia

    en.wikipedia.org/wiki/Talk:Left_recursion

    An) then the grammar will grow exponentially. If the ordering is reversed (An, An-1, .. A1) the grammer is left untouched since every direct left corner already precedes it's definition. A good article on this and alternative algorithms for removing left recursion is Removing Left Recursion from Context-Free Grammars.

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