Read e-book online Action Semantics PDF

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 substantial pragmatic merits over all earlier methods, in its comprehensibility and accessibility, and particularly within the usefulness of its semantic descriptions of lifelike programming languages. during this quantity, Dr Peter Mosses offers an intensive advent to motion semantics, and offers gigantic illustrations of its use. Graduates of machine technology or maths who've an curiosity within the semantics of programming languages will locate motion Semantics a such a lot precious ebook.

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In our notation, a regular expression is either a single symbol, or it consists of a sequence (R\... Rn), a grouped set of alternatives (Ri | . . *, 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.

Each combinator, on the other hand, expresses a particular mixture of control flow and how the various kinds of information flow. , not simulating one kind of information processing by another. Action notation also incorporates a basic notation for data, including truth-values, rational numbers, lists, and finite maps. The standard symbols used in action notation are ordinary English words. , the items of the given list. , choose a cell then reserve the given cell. ) These simple principles for choice of symbols provide a surprisingly grammatical fragment of English, allowing specifications of actions to be made fluently readable— without sacrificing formality at all!

In fact that is the case for numerals too: decimal _ is a standard operation mapping strings1 to natural numbers, and N is its own semantics! Of course, we could define a semantic function corresponding to decimal _ rather easily, but here we keep the example as short as possible, and leave the specification of the semantics of numerals as an exercise, see Exercise 3. 1 Strings are regarded as both syntactic and semantic entities. 3. Semantic Entities 31 When we define two different semantic functions / , g for the same syntactic construct x, we really intend the semantics of x to be (essentially) the pair (f x, g x).

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Action Semantics by Peter D. Mosses


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