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Tuesday, May 12, 2020 | History

3 edition of Locally least-cost error correctors for context-free and context sensitive parsers found in the catalog.

Locally least-cost error correctors for context-free and context sensitive parsers

Bernard A. Dion

Locally least-cost error correctors for context-free and context sensitive parsers

by Bernard A. Dion

  • 152 Want to read
  • 13 Currently reading

Published by UMI Research Press in Ann Arbor, Mich .
Written in English

    Subjects:
  • Computer programming.,
  • Programming languages (Electronic computers),
  • Error-correcting codes (Information theory),
  • Parsing (Computer grammar)

  • Edition Notes

    Statementby Bernard A. Dion.
    SeriesComputer science., no. 14
    Classifications
    LC ClassificationsQA76.6 .D56 1982
    The Physical Object
    Paginationx, 90 p. :
    Number of Pages90
    ID Numbers
    Open LibraryOL3488713M
    ISBN 10083571358X
    LC Control Number82008397

    Proceedings of the Fifth Annual ACM Symposium on the Principles of Programming Languages (), pp. Cited by: Top-Down Nearly-Context-Sensitive Parsing Eugene Charniak Brown Laboratory for Linguistic Information Processing (BLLIP) Brown University, Providence, RI [email protected] Abstract We present a new syntactic parser that works left-to-right and top down, thus maintaining a fully-connected parse tree for a few alternative parse hypotheses. All.

    Gregory F. Johnson, "Context Sensitive Attribute Flow," August Anil Pal, "Generating Execution Facilities for Integrated Programming Environments," December William H. Winsborough, "Automatic, Transparent Parallelization of Logic Programs at Compile Time," August Deep Dependencies from Context-Free Statistical Parsers: Correcting the Surface Dependency Approximation. January that can be seen as derivations of mildly context-sensitive grammars.

    Parsing context-free grammars (Languages that can be generated by pushdown automata.) Widely used for surface syntax description (correct word order specification) in natural languages. Space needed to parse: stack (sometimes a stack of stacks) In general, proportional to the number of levels of recursion in the data.   Abstract. In this work we propose a method to derive Stack Automata [] from context-free grammars with regular control languages []; by slightly restricting the operation of the machine we obtain a bottom-up parser which operates by reducing instances of the right-hand side of productions in a sentencial form to the corresponding left-hand side; since context-free grammars with regular control Cited by: 1.


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Locally least-cost error correctors for context-free and context sensitive parsers by Bernard A. Dion Download PDF EPUB FB2

COVID Resources. Reliable information about the Locally least-cost error correctors for context-free and context sensitive parsers book (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus.

Upon detection of a syntax error, a locally least-cost corrector operates by deleting 0 or more input symbols and inserting a terminal string that guarantees that the first non-deleted symbol will be accepted by the parser. The total correction cost, as defined by a table of deletion and insertion costs, is : Bernard A.

Dion. Semantic predicates are a powerful means of recognizing context-sensitive language structures by allowing runtime information to drive recognition. But the examples in the book are very simple. What i need to know is: can ANTLR parse context-sensitive rules like: xAy --> xBy. Context sensitivity.

A context-sensitive parser will accept a narrower range of inputs than a context-free parser. This is often desirable, as it eliminates the need to post-process the output of a parser to produce an accurate representation of the structure of an input.

A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. LuZc can parse a wide range of languages. Specifically unrestricted grammars, with a superfluous conjunctive operator for syntactic complimentary operator is planned for a later version.

Not only does it do this, but through state memoization it is guaranteed to terminate. The nesting classes of languages/grammars can be summarized and explained by describing the types of production.

Context Free is free and made available under the Gnu Public License. If you really like it, we'd like you to donate US$20 to the Electronic Frontier Foundation. Download & Install. Version is the current release.

Windows. Context Free (v45) (MB) for Windows Vista and later. The download file is an executable installer, just run it. 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 Cited by: Fischer et al. [4,6,7] define a “locally least-cost” repair using insertions and deletions, and provide algorithms for LL and LR parsers.

A locally least-cost repair is a least-cost sequence of deletions and insertions such that one more symbol in the original string will be accepted by the parser.

A locally least-cost repair is a least-cost sequence of deletions and insertions such that one more symbol in the original string will be accepted by the parser.

Backhouse [2,3] uses a similar. Patterns are essentially context-dependent. This paper describes an error-correcting parser for a context-free language, which finds most similar sentences to an input sentence based on the context-dependent similarity(CDS).

The proposed algorithm is obtained by modifying the Lyon’s error-correcting : M. Ikeda, E. Tanaka, O. Kasusho.

LR Parsing: Theory and Practice. accepted action stack attribute grammar BCPL canonical closure compiler computed configuration considered context free context free languages correct corresponding declarations decls defined definition derivation tree described detected deterministic element All Book Search results » Bibliographic 3/5(1).

When the compiler encounters an error symbol in an erroneous input, the local error-repair method repairs the input by either inserting a repair string before the. There are many forms of parsers General parsers - too inefficient for production, they can parse any CFG Top down parser (TD) - construct parse tree from root (start symbol) toward leaves (tokens) Bottom up parser (BU) - construct parse tree from leaves to root Both TD and BU scan the input stream left to right.

LL parsers (Left to right scan; Left most parsing) usually TD, prediction, hand coded. How was the reading experience on this article.

Check all that apply - Please note that only the first page is available if you have not selected a reading option after clicking "Read Article". A context-sensitive grammar (CSG) is a formal grammar in which the left-hand sides and right-hand sides of any production rules may be surrounded by a context of terminal and nonterminal t-sensitive grammars are more general than context-free grammars, in the sense that there are languages that can be described by CSG but not by context-free grammars.

An LL parser is a deterministic, canonical top-down parser for context-free grammars. An LR parser is a deterministic, canonical bottom-up parser for context-free grammars. Any parser that meets these definitions is an LL or LR parser. Both the strengths and weaknesses of LL and LR are encapsulated in these definitions.

Context-Free Syntax Analysis Implementation of Parsers Methods for context-free analysis Manually developed, grammar-specic implementation (error-prone, inexible) Backtracking (simple, but inefcient) Cocke-Younger-Kasami-Algorithm (): I for all CFGs in Chomsky normalform I based on idea of dynamic programmingFile Size: 1MB.

Local error repair of strings during CFG parsing requires the insertion and deletion of symbols in the region of a syntax error to produce a string that is error free Author: J McKenzieBruce, YeatmanCorey, de VereLorraine.

I guess I should comment. A parser is a program which processes an input and "understands" it. A parser generator is a tool used to write parsers. I guess you mean you want to learn more about generating parsers, in which case, you should refer to the documentation of parser.

4. Cerecke, C.: Repairing syntax errors in LR-based parsers. In: The Twenty-Fifth Australasian Computer Science Conference, ACSC’02, 4, pp. 17–ACM, Melbourne Cited by: 2. Parsing Beyond Context-Free Grammars we approach context-sensitive parsing through the idea that parsers may recall previously matched input (or Author: Laura Kallmeyer.This article reports on an error-repair algorithm for LR parsers.

It locally inserts, deletes or shifts symbols at the positions where errors are detected, thus modifying the right context in order Cited by: