March 15, 2018

Download e-book for iPad: Action Semantics by Peter D. Mosses

By Peter D. Mosses

ISBN-10: 0511569866

ISBN-13: 9780511569869

ISBN-10: 0521403472

ISBN-13: 9780521403474

ISBN-10: 0521619335

ISBN-13: 9780521619332

Motion Semantics is a unique method of the formal description of programming languages. Its abstractness is at an intermediate point, among that of denotational and operational semantics. motion Semantics has significant pragmatic merits over all earlier ways, in its comprehensibility and accessibility, and particularly within the usefulness of its semantic descriptions of reasonable programming languages. during this quantity, Dr Peter Mosses provides an intensive advent to motion semantics, and offers monstrous illustrations of its use. Graduates of laptop technological know-how or maths who've an curiosity within the semantics of programming languages will locate motion Semantics a such a lot valuable e-book.

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Extra info for Action Semantics

Example text

In any case, the increased length of each symbol seems to be far outweighed by its increased perspicuity. It would also be rather misleading to use familiar mathematical signs to express actions, whose essence is unashamedly computational. For some applications, however, such as formal reasoning about program equivalence on the basis of their action semantics, optimal conciseness may be highly desirable, and it would be appropriate to use abbreviations for our verbose symbols. The choice of abbreviations is left to the discretion of the user.

Mutual dependence is allowed. • Our grammars for specifying abstract syntax are context-free. They allow regular expressions. Double brackets [ . . ] indicate node construction. Terminal symbols may be characters or strings. Abstract syntax is not concerned with parsing, so the possible ambiguity of grammars is irrelevant. • Semantic equations are inductive definitions of semantic functions that map abstract syntax trees compositionally to semantic entities. The semantic equations for a particular semantic function must be exhaustive, and must not overlap.

Or an obligatory repeatable part /? + . We do not use the rather inelegant notation for optional and repetitive parts provided by so-called EXTENDED BNF, despite its familiarity from reference manuals, because we have a better use for the brackets it uses for optional parts [iJ], and its {R} is hardly suggestive of ordered repetition! Moreover, EXTENDED BNF requires R {R} to express that R is an obligatory repeatable part, whereas our R+ avoids writing R twice. The standard nonterminals digit and letter are always implicitly specified in our grammars, for convenience when specifying the lexical syntax of numerals and identifiers.

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Action Semantics by Peter D. Mosses


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