The Design of Interpreters, Compilers, and Editors for by Timothy Wilking Finin (auth.), Leonard Bloc (eds.)

By Timothy Wilking Finin (auth.), Leonard Bloc (eds.)

Augmented Transition community Grammars are at the moment the main familiar process for examining average languages. regardless of the expanding po­ pularity of this system, besides the fact that, no huge papers on ATN-Grammars were awarded which might be available to a bigger variety of according to­ sons engaged within the challenge from either the theoretical and useful issues of view. Augmented Transition Networks (ATN) are derived from country automata. Like a finite kingdom automaton, an ATN comprises a set of los angeles­ beled states and arcs, a special begin country and a collection of distin­ guished ultimate states. States are hooked up with one another by means of arcs crea­ ting a directed graph or web. The label on an arc shows a terminal image (word) or the kind of phrases which needs to ensue in an enter flow to permit the transition to the subsequent country. it's stated series of phrases (or sentence) is authorised by way of any such web if there exists a se­ quence of arcs (usually referred to as a path), connecting the beginning country with a last kingdom, that are to the sentence. The finite nation automaton is then enriched via numerous amenities which bring up its computational energy. crucial of them allows a few arcs to be categorised through nonterminal instead of terminal symbols. which means the transition via such an arc is absolutely the re­ cursive software of the web starting with a pointed state.

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In the environment of the compiler, the functions DEFARC, DEFSTATE, DEFINTERUPT, etc. are defined to be macros compile their arguments into Lisp code. Thus, the Lisp compiler sees only the Lisp code and not the grammar in the ATN formalism. Switches may be set in a similar manner. For example, one might include the expression: (DECLARE (FASLOAD ATNCOMPlLER ••• ) (SETQ ATNTRACE? NIL) (SETQ FAlLARC? NIL» :no tracing :no (FAIL 'ARC) actions in the file containing the networks. Interactions with NCOMPLR If the ATN networks call any user defined functions they may have to be declared to NCOMPLR.

The sixth provides a special facility by which one can save the state of a subcomputation just before returning via a POP and later resume it with the same register environment. 1 Effecting State Transitions These are typically found as the last action at the end of an arc, as in: (CAT v t (SETR v *) (TO s:verb» (TST T (out-of-words) (JUMP s:end» They can, however, be called at any point by the user and embedded in arbitrary LISP expressions. For example, the destination of the following arc is determined at run-time: (CAT v t (setr v *) (cond ((transitive ~v) (TO s:verb-trans» ((TO s:verb-interans»» (TO '

Features generated by the Dictionary Manager. For regularly inflected words, certain features are automatically generated. 3. The FEATURES property of the word. Each word can have a FEATURES property associated with it. For example, the word GIVE might have the features property: (TRANSITIVE INDIRECTOBJECT PASSIVE) where these features might mean that GIVE is a transitive verb which can take an indirect object and can be used in a passive sentence. In cases one and two above, a feature can be: o A tuple whose first element is the name of the feature and whose second is the value.

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