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IEICE TRANSACTIONS on Information

OAG*: Improved Ordered Attribute Grammars for Less Type 3 Circularities

Shin NATORI, Katsuhiko GONDOW, Takashi IMAIZUMI, Takeshi HAGIWARA, Takuya KATAYAMA

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Summary :

Ordered attribute grammars (OAGs for short) are a useful class of attribute grammars (AGs). For some attribute grammars, even though they are not circular, OAG circularity test reports that they are not ordered and fails to generate attribute evaluators because some approximation introduces circularities (called type 3 circularities in this paper). First we discuss that it is sometimes difficult for programmers to eliminate type 3 circularities by hand. Second, to reduce this difficulty, we propose a new AG class called OAG* that produces less type 3 circularities than OAG while preserving the positive characteristic of OAG. OAG* uses a global dependency graph GDS that provides a new approximation algorithm. We obtained good results with our experimental implementation of OAG*. It is shown that OAG* is different from the existing GAG and Eli/Liga systems. Finally, two combinations of Eli/Liga and OAG* are provided.

Publication
IEICE TRANSACTIONS on Information Vol.E86-D No.4 pp.673-685
Publication Date
2003/04/01
Publicized
Online ISSN
DOI
Type of Manuscript
PAPER
Category
Theory of Automata, Formal Language Theory

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