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On parsing two-level grammars

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Summary

Making use of the fact that two-level grammars (TLGs) may be thought of as finite specification of context-free grammars (CFGs) with “infinite” sets of productions, known techniques for parsing CFGs are applied to TLGs by first specifying a canonical CFG G′ — called skeleton grammar — obtained from the “cross-reference” of the TLG G. Under very natural restrictions it can be shown that for these grammar pairs (G, G′) there exists a 1 — 1 correspondence between leftmost derivations in G and leftmost derivations in G′. With these results a straightforward parsing algorithm for restricted TLGs is given.

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  1. Institut für Angewandte Informatik und Formale Beschreibungsverfahren der Universität Karlsruhe, Postfach 6380, 7500, Karlsruhe 1, Germany (Fed. Rep.)

    Lutz Michael Wegner

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  1. Lutz Michael Wegner
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Wegner, L.M. On parsing two-level grammars. Acta Informatica 14, 175–193 (1980). https://doi.org/10.1007/BF00288543

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  • DOI: https://doi.org/10.1007/BF00288543

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