Acta Informatica

, Volume 13, Issue 2, pp 141–154 | Cite as

Efficient LL(1) error correction and recovery using only insertions

  • C. N. Fischer
  • D. R. Milton
  • S. B. Quiring


An LL(1)-based error-corrector which operates by insertion-only is studied. The corrector is able to correct and parse any input string. It is efficient (linear in space and time requirements) and chooses least-cost insertions (as defined by the user) in correcting syntax errors. Moreover, the error-corrector can be generated automatically from the grammar and a table of terminal symbol insertion costs. This method is also very well suited for use as an automatic error-recovery technique in LL(1) parsers. The class of LL(1) grammars correctable by this method contains (with minor modifications) grammars used to specify most common programming languages. Preliminary results suggest that this method can be used to advantage in LL(1)-driven compilers.


Information System Operating System Data Structure Communication Network Information Theory 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag 1980

Authors and Affiliations

  • C. N. Fischer
    • 1
  • D. R. Milton
    • 1
  • S. B. Quiring
    • 1
  1. 1.University of Wisconsin-MadisonMadisonUSA

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