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An efficient context-free parsing algorithm

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Earley, Jay·1983·Communications of the ACM

Abstract

A parsing algorithm which seems to be the most efficient general context-free algorithm known is described. It is similar to both Knuth's LR( k ) algorithm and the familiar top-down algorithm. It has a time bound proportional to n 3 (where n is the length of the string being parsed) in general; it has an n 2 bound for unambiguous grammars; and it runs in linear time on a large class of grammars, which seems to include most practical context-free programming language grammars. In an empirical comparison it appears to be superior to the top-down and bottom-up algorithms studied by Griffiths and Petrick.

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Metadata

Authors
Earley, J.
Venue
Communications of the ACM
Published
1983-01
Volume
26
Issue
1
Pages
57-61
ISSN
  • 0001-0782 (ISSN-L)
  • 1557-7317
OpenAlex
W2122472280
Cited by
1,606
References
1
FWCI
21.04
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: An efficient context-free parsing algorithm. https://app.cochat.ai/papers/10.1145/357980.358005
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Earley, J. (1983). An efficient context-free parsing algorithm. Communications of the ACM. https://doi.org/10.1145/357980.358005

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