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Before I get into the details of the example, however, I should say a few words about the development approach used in the LunchCounter example in the next section. The approach used could be
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CHAPTER 3 DOMAIN-SPECIFIC LANGUAGES 101: LOLA S LUNCH COUNTER
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characterized as a rudimentary form of test-driven development. What I mean by this is that I start with some very simple sample data (e.g., some simple sandwich order expressions for the DSL); then you build some code with this sample data, and see if it works. If it does, you move to the next level of refinement in terms of the DSL syntax, and modify the sample DSL statements to reflect this new level of complexity. This will nearly always break the existing grammar definition used for parsing the DSL, so you modify the grammar to correct the errors. This turns into an iterative process where you can go through many of these refinement cycles and build up a reasonably sophisticated system. I don t want to call the end product in this example sophisticated, by any means. The point is that some readers may find this approach frustrating at times because things keep breaking as the example unfolds. If you haven t done test-driven development before, it may take a little getting used to. If you have, it shouldn t be an issue. On a separate note, I will be introducing some new and possibly unfamiliar terms (like extent, which you will see shortly) that have a very specific meaning within the M language and the SQL Server Modeling framework. If you haven t run across some of these terms before in your travels or reading, they may take some getting used to. I know they sometimes caused me a little uncertainty in the course of getting up to speed with this new framework. I have found the best approach is to forge ahead through the code samples and the explanations, and things will usually become clear in due course. Often things will become even clearer on a second or third reading and as you become more conversant in the language. And one more thing please don t feel that, once you ve finished this chapter, you will walk away knowing how to construct a DSL or write a grammar in M to process DSLs. My intent here is to unpack a very simple use case, but at a somewhat higher level than the coding basics: what a DSL and a grammar look like and some of the thinking that goes into building these things from the ground up. That s why I decided to use a narrative-based approach in the exercise to show how the thinking and analysis might unfold, as well as provide a taste of how working with a nontechnical (but intelligent) stakeholder might happen. If you don t like storytelling in computer books, be patient. It s the only place in the book where I try it. The bottom line: Don t be too concerned when reading the code if you don t understand every nuance of what you re seeing. That s not the intended purpose of this chapter. Otherwise, it would have been called Domain-Specific Languages 201.
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A Simple Exercise: The Sandwich Language
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So let s pick a simple domain to work with. As domains go, the sandwich is as simple as you can get. Let s say you re the owner of <Your Name Here> s Lunch Counter. Perhaps your name is Lola, but if not, feel free to substitute your name for Lola anytime Lola occurs in what follows. The name of your business is, naturally, Lola s Lunch Counter. Your specialty is pretty good sandwiches (apologies to Garrison Keillor), and the business has grown to the point you re thinking about automating your order and kitchen workflow, maybe with an eye to franchising the business. Your nephew is a hotshot .NET developer, and says he will help. So let s follow along as you, Lola <or your name here>, and your nephew (whose name shall be Norm) work together in the process of developing a model for tracking and processing sandwich orders. Norm says the problem is amenable to developing a DSL, and (not knowing any better) you say this sounds like a good plan.
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