A Syntax-Oriented Translator by Peter Zilahy Ingerman PDF

By Peter Zilahy Ingerman

ISBN-10: 1483231046

ISBN-13: 9781483231044

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Additional info for A Syntax-Oriented Translator

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Define the set Ε of extensions by the recursive relationship: i. Every element of Ρ is an element of E. ii. If Cj and Cj are elements of E, then Cj juxtaposed with Cj is an element of E. In other words, Ε is composed of all accretions of all lengths of elements of the set P. Although this produces an infinite set, no difficulty is encountered, since the set Ε is used as a conceptual tool only. If the requirement of the preceding paragraph on the unique dejuxtaposability of accretions into elements of Ρ were not met.

When the question of applicability of a rule arises, there are two additional pieces of data available to the parsing processor. First, either the first unused base object of the input accretion or the last rule used in the parsing process is known. Second, there is some element of N(L) which may be considered to be the goal of the current parsing effort; initially, this is the head of the language. A rule is applicable if: i. 18) mentioned above, and ii. the second datum mentioned above. 18 does not necessarily mean that it applies.

If this happens, the parsing processor must try the alternative rules. ) A simple method of finding the rulechains will be presented in the next section. The first datum of the preceding paragraph is the datum in hand for some step in the parsing process, and the second datum is the correspond­ ing goal. Each step in the parsing process has a new datum in hand, and may also have a new goal. Consider a rule-chain consisting of rules which have only a single metacomponent. By the definition of a rule-chain, only the left-most rule has an element of B(L) as a metacomponent.

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A Syntax-Oriented Translator by Peter Zilahy Ingerman


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