By Daniel P. Friedman, Mitchell Wand
A brand new version of a textbook that gives scholars with a deep, operating realizing of the basic suggestions of programming languages, thoroughly revised, with major new fabric.
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Additional resources for Essentials of Programming Languages (3rd Edition)
The procedure will be responsible for handling the data corresponding to that nonterminal, and nothing else. • In each procedure, write one alternative for each production corresponding to that nonterminal. You may need additional case structure, but this will get you started. For each nonterminal that appears in the right-hand side, write a recursive call to the procedure for that nonterminal. 3 Auxiliary Procedures and Context Arguments The Follow-the-Grammar recipe is powerful, but sometimes it is not sufﬁcient.
In this section we introduce some strategies for representing data types. We illustrate these choices using a data type of environments. An environment associates a value with each element of a ﬁnite set of variables. An environment may be used to associate variables with their values in a programming language implementation. A compiler may also use an environment to associate each variable name with information about that variable. Variables may be represented in any way we please, so long as we can check two variables for equality.
Here, we use “or” to mean inclusive or, meaning that this includes the possibility that x occurs free in both e1 and e2 . We will generally use “or” in this sense. ” What other meanings can “or” have? Then it is easy to deﬁne occurs-free?. Since there are three alternatives to be checked, we use a Scheme cond rather than an if. In Scheme, (or exp1 exp2) returns a true value if either exp1 or exp2 returns a true value. occurs-free? : Sym × LcExp → Bool usage: returns #t if the symbol var occurs free in exp, otherwise returns #f.