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In computer science, a Van Wijngaarden grammar (also vW-grammar or W-grammar [1]) is a formalism for defining formal languages. The name derives from the formalism invented by Adriaan van Wijngaarden [2] for the purpose of defining the ALGOL 68 programming language. The resulting specification [3] remains its most notable application.
Adriaan "Aad" van Wijngaarden (2 November 1916 – 7 February 1987) was a Dutch mathematician and computer scientist. Trained as a mechanical engineer, Van Wijngaarden emphasized and promoted the mathematical aspects of computing, first in numerical analysis , then in programming languages and finally in design principles of such languages.
ALGOL 68 was defined using a formalism, a two-level formal grammar, invented by Adriaan van Wijngaarden. Van Wijngaarden grammars use a context-free grammar to generate an infinite set of productions that will recognize a particular ALGOL 68 program; notably, they are able to express the kind of requirements that in many other programming ...
Van Wijngaarden grammar (also vW-grammar or W-grammar) is a two-level grammar that provides a technique to define potentially infinite context-free grammars in a finite number of rules. The formalism was invented by Adriaan van Wijngaarden to rigorously define some syntactic restrictions that previously had to be formulated in natural language ...
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The ALGOL W Language Description [4] defines ALGOL W in an affix grammar that resembles Backus–Naur form (BNF). This formal grammar was a precursor of the Van Wijngaarden grammar. [1] [5] Much of ALGOL W's semantics is defined grammatically: [4] Identifiers are distinguished by their definition within the current scope.
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European Union foreign policy chief Kaja Kallas and U.S. Secretary of State Marco Rubio discussed the Ukraine war, Iran and China on Tuesday in their first phone call since the Trump ...