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When a program presents a number of different but somewhat similar cases that it can deal with, it can be advantageous to use a simple language to describe these cases and then have the program interpret that language Such cases can be as simple as the Macro language recording facilities that various office suite programs provide or as complex as Visual Basic for Applications (VBA) VBA not only is included in Microsoft Office products but also can be easily embedded in any number of third-party products One problem is how to recognize when a language can be helpful The Macro language recorder records menu and keystroke operations for later playback and just barely qualifies as a language; it might not actually have a written form or grammar Languages such as VBA, by contrast, are quite complex but are far beyond the capabilities of the individual application developer Further, embedding commercial languages such as VBA, Java, or SmallTalk usually requires substantial licensing fees this makes them less attractive to all but the largest developers
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As the Smalltalk Companion notes, recognizing cases in which an Interpreter can be helpful is much of the problem, and programmers without formal language/compiler training often overlook this approach There aren't many such cases, but there are three in which languages apply: 1 When you need a command interpreter to parse user commands: The user can type queries of various kinds and obtain a variety of answers 2 When the program must parse an algebraic string: This case is fairly obvious The program is asked to carry out its operations based on a computation in which the user enters an equation of some sort This often occurs in mathematical-graphics programs, where the program renders a curve or surface based on any equation that it can evaluate Programs such as Mathematica and graph drawing packages such as Origin work in this way 3 When the program must produce varying kinds of output: This case is a little less obvious but far more useful Consider a program that can display columns of data in any order and sort them in various ways These programs are often called Report Generators The underlying data might be stored in a relational database, but the user interface to the report program is usually much simpler then the SQL that the database uses In fact, in some cases the simple report language might be interpreted by the report program and translated into SQL
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Let's consider a report generator that can operate on five columns of data in a table and return various reports on these data Suppose that we have the following results from a swimming competition:
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Amanda McCarthy Jamie Falco Meaghan O'Donnell Greer Gibbs Rhiannon Jeffrey Sophie Connolly Dana Helyer 12 12 12 12 11 12 12 WCA HNHS EDST CDEV WYW WAC ARAC 2928 2980 3000 3004 3004 3005 3018
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The five column names are frname, lname, age, club, and time If we consider the complete race results of 51 swimmers, we might want to sort these results by club, by last name, or by age We could produce several useful reports from these data in which the order of the columns changes as well as the sorting, so a language is one useful way to handle these reports We'll define a very simple nonrecursive grammar of the sort
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Print lname frname club time Sortby club Thenby time
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For the purposes of this example, we define the three verbs given in the grammar as
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and the five column names as
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frname lname age club time
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For convenience, we assume that the language is case-insensitive and that its grammar is punctuation-free, amounting in brief to Print var[var] [sortby var [thenby var]] Finally, the grammar contains only one main verb, and while each statement is a declaration, it has no assignment statement or computational ability
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