By Peter D. Mosses
Motion Semantics is a singular 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 enormous pragmatic benefits over all past techniques, in its comprehensibility and accessibility, and particularly within the usefulness of its semantic descriptions of sensible programming languages. during this quantity, Dr Peter Mosses offers a radical advent to motion semantics, and gives huge illustrations of its use. Graduates of machine technological know-how or maths who've an curiosity within the semantics of programming languages will locate motion Semantics a so much necessary publication.
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Additional resources for Action Semantics
Note that nondeterminism does not imply actual randomness: each implementation of a nondeterministic behaviour may be absolutely deterministic. The information processed by action performance may be classified according to how far it tends to be propagated, as follows: • transient: tuples of data, corresponding to intermediate results; • scoped: bindings of tokens to data, corresponding to symbol tables; • stable: data stored in cells, corresponding to the values assigned to variables; • permanent: data communicated between distributed actions.
24 Chapter 2. 1 Abstract Syntax Now let us consider how to specify abstract syntax. Reference manuals for programming languages generally use formal context-free grammars, augmented by some form of regular expressions, to specify concrete syntax. A formal grammar consists of a set of productions, involving terminal symbols, which may be characters or strings, as well as auxiliary nonterminal symbols. Formal grammars have excellent pragmatic properties, such as readability and modifiability; let us^adapt them for specifying abstract syntax.
In this book, we do not bother with specifying concrete syntax formally at all, but when we specify an abstract syntax we use ordinary lexical symbols as R "if" "then" / / "n V 4 •, \ ^ / '•while" / "do" \ ^0" "m" "begin" "end" "n" ii. II HI \ II II. 2. Semantic Functions 27 terminal symbols in grammars, which makes it rather easy to imagine a corresponding concrete syntax (up to disambiguation of grouping, at least). We have considered the form of the grammars that we use to specify abstract syntax.
Action Semantics by Peter D. Mosses