Filters








922 Hits in 6.8 sec

On the complexities of linear LL(1) and LR(1) grammars [chapter]

Markus Holzer, Klaus -Jörn Lange
1993 Lecture Notes in Computer Science  
Several notions of deterministic linear languages are considered and compared with respect to their complexities and to the families of formal languages they generate.  ...  Deterministic linear languages turn out to be special cases of languages generated by linear grammars restricted to LL(1) conditions, which have a membership problem solvable in N C 1 .  ...  In contrast to that both the deterministic linear languages according to Ibarra, Jiang, and Ravikumar 10] and those according to Nasu and Honda 15] are based on linear grammars restricted by an LL(1)  ... 
doi:10.1007/3-540-57163-9_25 fatcat:wuacgcrb2veq5ablq4zy74he2a

Tolerant parsing using modified LR(1) and LL(1) algorithms with embedded "Any" symbol

A.V. Goloveshkin
2019 Proceedings of the Institute for System Programming of RAS  
They allow one to further minimize the number and complexity of water rules and make tolerant grammars extendible.  ...  In comparison with LL(1) tolerant grammars, LR(1) tolerant grammars are easier to develop and explore due to solid island rules.  ...  To get a similar benefit from our modified deterministic parsing while preserving mostly linear complexity, we add special Any-based error recovery routines in both LL(1) and LR(1) algorithms.  ... 
doi:10.15514/ispras-2019-31(3)-1 fatcat:hgh5b6nxgrfzpbtmubzs23rbci

Reachability and error diagnosis in LR(1) parsers

François Pottier
2016 Proceedings of the 25th International Conference on Compiler Construction - CC 2016  
We report on an application of this technique to the CompCert ISO C99 parser, and discuss its strengths and limitations.  ...  the grammar evolves.  ...  The anonymous reviewers offered insightful remarks and pointers to the literature.  ... 
doi:10.1145/2892208.2892224 dblp:conf/cc/Pottier16 fatcat:sshofm7langrpawyjxwsqporri

LL (1) Parser versus GNF inducted LL (1) Parser on Arithmetic Expressions Grammar: A Comparative Study

Hassan Ali, Muhammad Shumail Naveed, Dilawar Naseem, Jawaid Shabbir
2020 Quaid-e-awam University research journal of engineering science & technology  
The study adds to the knowledge of parsers itself, parser expression grammars (PEG's), LL(1) grammars, Greibach Normal Form (GNF) induced grammar structure, and the induction of Arithmetic PEG's LL(1)  ...  Conventional arithmetic expression grammar and its equivalent LL(1) is used in the study which is converted.  ...  LL(1), bi-directional LL(1) and XML grammars are mostly linear, but sometimes quadratic, depending on the number of spaces included in the input stack. Scott et. al.  ... 
doi:10.52584/qrj.1802.14 fatcat:2gy57uthefakbgrstfncminxqm

A new parsing method for non-LR(1) grammars

A. Gayler Harford, Vincent P. Heurinc, Michael G. Main
1992 Software, Practice & Experience  
MAIN As an example, consider the following grammar fragment: One symbol of look ahead is insufficient to distinguish between 〈 leftside 〉 and 〈 expression 〉 (the grammar may not even be LR( k ) if expressions  ...  One of the difficult problems that faces a compiler writer is to devise a grammar that is suitable for both efficient parsing and semantic attribution.  ...  Mark Swain, Masayoshi Ishikawa, Robert Gray, and David Bowling provided useful grammars. We also wish to thank the students who tried out the system.  ... 
doi:10.1002/spe.4380220505 fatcat:ke5peqds35czzb7oh56wz43at4

Formal Grammars and Languages [chapter]

Tao Jiang, Ming Li, Bala Ravikumar, Kenneth Regan
2009 Algorithms and Theory of Computation Handbook, Second Edition, Volume 1  
It is easy to show that our LL parser runs in linear time for any LL(1) grammar. What can we do for grammars that are not LL(1), such as G 9 ?  ...  Here, the "1" signifies the fact that the LL parser uses one input symbol of lookahead to decide its next move. For example, G 8 is an LL(1) grammar, while G 9 is not.  ...  ACTION (q, c) can be one of the following: 1. shift, 2. reduce by A → α, where A → α is a production in the grammar, 3. accept, and 4. blank .  ... 
doi:10.1201/9781584888239-c20 fatcat:k4e5ivi7ujgpbkb47nectsjwxi

LLLR Parsing: a Combination of LL and LR Parsing

BošTjan Slivnik, Marc Herbstritt
2016 Symposium on Languages, Applications and Technologies  
An embedded LR parser starts parsing the remaining input and once the LL conflict is resolved, the LR parser produces the left parse of the substring it has just parsed and passes the control back to the  ...  The LLLR(k) parser can be constructed for any LR(k) grammar.  ...  One could also use a much stronger GLR parsing but the time complexity is O(np+1) (where p is the length of the longest production).  ... 
doi:10.4230/oasics.slate.2016.5 dblp:conf/slate/Slivnik16 fatcat:5neinj4wxnhrnkresckqnmp34m

Derivational complexity of context-free grammars

Seppo Sippu
1982 Information and Control  
Minimal grammardependent upper bounds are determined both on the derivational time complexity, that is, the number of derivation steps needed to derive a sentence of given length, and on the derivational  ...  In addition to general context-free grammars, these upper bounds are also determined specifically for e-free grammars, non-leftrecursive and non-right-recursive grammars, and for LL(k) grammars.  ...  ACKNOWLEDGMENT I wish to thank Eljas Soisalon-Soininen for illuminating discussions on the topic of the paper.  ... 
doi:10.1016/s0019-9958(82)91111-1 fatcat:pd5xnqczavbytkpqzz2aw7cqy4

Boolean grammars

Alexander Okhotin
2004 Information and Computation  
A new generalization of context-free grammars is introduced: Boolean grammars allow the use of all settheoretic operations as an integral part of the formalism of rules.  ...  cubic-time recognition algorithm and some limited extension of the notion of a parse tree, which together allow to conjecture practical applicability of the new concept.  ...  Several parsing algorithms for conjunctive grammars with worst-case cubic time performance, including extensions of LL(k) and generalized LR, were developed and implemented in a parser generator [23]  ... 
doi:10.1016/j.ic.2004.03.006 fatcat:72ahhppp7rdu7dh522atfhgq7u

A forward move algorithm for LL and LR parsers

Jon Mauney, Charles N. Fischer
1982 Proceedings of the 1982 SIGPLAN symposium on Compiler construction - SIGPLAN '82  
The algorithm to compute such corrections is linear in the size of the grammar, and cubic in the size of the region.  ...  and Jon Mauney, "On the role of error productions in syntactic error correction," Computer LL(1) error corrector," Tech. Report #371, University of Wisconsin (August 1979).  ... 
doi:10.1145/800230.806982 dblp:conf/sigplan/MauneyF82 fatcat:nz4r6i3wvrat5i4qe2qar6enti

Partitioned chain grammars [chapter]

Peter Schlichtiger
1980 Lecture Notes in Computer Science  
This paper introduces a new class of grammars, the partitioned chain grammars, for which efficient parsers can be automatically generated.  ...  Main advantage of the partitioned chain gramrnars however is, that given a language it is usually easier to describe it by a partitioned chain grammar than to construct a grammar of some other type commonly  ...  The reader is assumed to be familiar with the basic concepts of context-free grammars and parsing, in particular with the definition and the parsing-methods for LR(k)-, LALR(k)-, SLR(k)and LL(k)-grammars  ... 
doi:10.1007/3-540-10003-2_98 fatcat:leje5shzwvf37ebauenvf5lx7e

Deciding the inequivalence of context-free grammars with 1-letter terminal alphabet is ΣP2-complete

Dung T. Huynh
1984 Theoretical Computer Science  
This paper deals with the complexity of context-free grammars with l-letter terminal alphabet. We stuily the complexity of the membership problem and the inequivalence problem.  ...  We show that the first problem is NP-complete and the second one is Zg-complete with respect to log-space reduction.  ...  Simon for some critical resnarks; concerning this paper, and an anonymous referee for many helpful suggestions in clarifying the presentation of this work.  ... 
doi:10.1016/0304-3975(84)90092-6 fatcat:g2uvldjryvfrvphefujm3nbqne

LR recursive transition networks for Earley and Tomita parsing

Mark Perlin
1991 Proceedings of the 29th annual meeting on Association for Computational Linguistics -  
The linear text of a context-free grammar can be cast into an RTN structure (Perlin, 1989) . This is done by expanding each grammar rule into a linear chain.  ...  By only recursing on unvisited nodes, this traversal of the grammar RTN has time cost O(IGI) (Aho, Sethi, and UUman, 1986) , where IGI >_ IRTNI is the size of the grammar (or its RTN graph).  ... 
doi:10.3115/981344.981357 dblp:conf/acl/Perlin91 fatcat:du3jw2dv2jg4vipac66sweah3a

Parsing expression grammars

Bryan Ford
2004 SIGPLAN notices  
A linear-time parser can be built for any PEG, avoiding both the complexity and fickleness of LR parsers and the inefficiency of generalized CFG parsing.  ...  For decades we have been using Chomsky's generative system of grammars, particularly context-free grammars (CFGs) and regular expressions (REs), to express the syntax of programming languages and protocols  ...  Acknowledgments I would like to thank my advisor Frans Kaashoek, as well as François Pottier, Robert Grimm, Terence Parr, Arnar Birgisson, and the POPL reviewers, for valuable feedback and discussion and  ... 
doi:10.1145/982962.964011 fatcat:63a6etkqv5durlfo2nptfadsdi

Formal Grammars and Languages [chapter]

Tao Jiang, Ming Li, Bala Ravikumar, Kenneth Regan
1998 Algorithms and Theory of Computation Handbook  
It is easy to show that our LL parser runs in linear time for any LL(1) grammar. What can we do for grammars that are not LL(1), such as G 9 ?  ...  Here, the "1" signifies the fact that the LL parser uses one input symbol of lookahead to decide its next move. For example, G 8 is an LL(1) grammar, while G 9 is not.  ...  ACTION (q, c) can be one of the following: 1. shift, 2. reduce by A → α, where A → α is a production in the grammar, 3. accept, and 4. blank .  ... 
doi:10.1201/9781420049503-c26 fatcat:x3mj3ftb5rhf3nih23b7dr4l54
« Previous Showing results 1 — 15 out of 922 results