Download e-book for kindle: 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 massive pragmatic merits over all earlier ways, in its comprehensibility and accessibility, and particularly within the usefulness of its semantic descriptions of life like programming languages. during this quantity, Dr Peter Mosses supplies an intensive creation to motion semantics, and gives massive illustrations of its use. Graduates of desktop technological know-how or maths who've an curiosity within the semantics of programming languages will locate motion Semantics a so much worthy e-book.

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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.

Well-formedness is usually defined as a binary relation between context-dependent information and phrases, and the well-formedness of a compound phrase may depend on the well-formedness of its subphrases with modified context-dependent information. As with attribute grammars, this technique is not applicable when scope rules are dynamic. Here, let us keep abstract syntax context-free, and describe context-sensitive aspects separately. This amounts to treating context-sensitive syntax as a kind of seman- 12 Chapter 1.

For instance, equation (2) above defines the application of the semantic function execute _ to nodes with four branches, where the first branch is the string "if", the second an expression E, the third "then", and the last branch is a statement S, in terms of evaluate E and execute S. 3). Readers familiar with denotational semantics should observe that we do not write [ E J and [ S J on the right of the equation, since E and S by themselves already stand for trees. Nevertheless, we can still regard [ .

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Action Semantics by Peter D. Mosses


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