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The first thing Norm does is to change the Main syntax rule to define it as a collection of one or more SandwichOrders. This will result in creating a collection in the M Graph code, which would map to what is called an extent. Extents correspond to tables within the database, once the model is deployed to SQL
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CHAPTER 3 DOMAIN-SPECIFIC LANGUAGES 101: LOLA S LUNCH COUNTER
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Server. When the image file generated by the M compiler is installed in the Repository database, this would result in a table of SandwichOrders. (For now, think of repository as a fancy word for database.) Figure 3-18 shows the results of the first of these changes.
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Figure 3-18. Changing the Main syntax role and adding the SandwichOrder syntax rule You still have the Blue on Blue problem, but in the generated M Graph you are identifying the Lunchmeat and Bread data components, even if there are no semantic constraints on these. Let s walk through the structure of the code of the DSL Grammar definition (center panel). At the highest level (outermost curly braces), you have the LunchCounter module, which defines your namespace. Within the module, you have a single language definition, named SandwichOrders. The language definition (contained within the next set of curly braces) consists of a collection of syntax rules, token rules, and an interleave rule (discussed in the section titled Defining Tokens ). The Main syntax rule: syntax Main = SandwichOrder* sets the Main syntax rule to be a collection of zero or more SandwichOrders. (Recall that the asterisk * is a multiplicity operator designating a collection of zero or more instances.) The SandwichOrder syntax rule: syntax SandwichOrder = lm:Lunchmeat "on" br:Bread "." => {Lunchmeat => lm, Bread => br} is really the heart of the SandwichOrders language definition. This construction says two things. A SandwichOrder consists of a Lunchmeat token, given the identifier lm, followed by the literal "on", followed by a Bread token given the identifier br, followed by the period character ".". => is the binding operator, so the second line of the preceding code syntax rule statement means that the construction results in an entity with two members: a Lunchmeat token with the value lm and a Bread token with the value br. Entities are simply collections with named values, so here you re defining an entity with two values: a Lunchmeat value (bound to the identifier lm) and a Bread value (bound to the identifier br).
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Next, Norm again refines the Main syntax rule to store the collection of SandwichOrders in an extent named SandwichOrders. You see the results in Figure 3-19. What you see in the M Graph pane shows that you re getting a little closer to what you might call structured data.
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Figure 3-19. Generating the SandwichOrders collection with restructured syntax rules Lola: Okay Norm one step forward, and one back. I can see you re making some progress in getting to where the system knows its lunchmeat from its bread. Not to complicate things too much, but do you think you could add in condiments, like mayo or mustard Norm: Sure thing. As usual, I ll add an order with a condiment and see how this breaks the DSL grammar definition. Type an order with a condiment, and I ll see what kind of error you get. Lola types: Ham on Baguette with Mayo. Figure 3-20 shows the results.
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Figure 3-20. Testing a condiment addition Norm has clicked on the single error description in the Error List pane, and this has highlighted the DSL segment "with" after the Bread token, the cause of this particular error.
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Norm: Well, clearly you ve broken the grammar definition in at least a couple of ways, since it is no longer generating M Graph output in the right pane. From what you see in the error list, it thinks the word with is a Lunchmeat token. Here s what I d suggest. Let s not add condiments into the system for the time being, and instead focus on refining the Lunchmeat and Bread syntax so that you get rid of the Blue on Blue problem, and the system is smart enough to exclude nonsense orders like ham on pastrami, even though ham and pastrami are both valid token values. Lola: Makes sense. One thing at a time. Norm changes the token definitions for Lunchmeat and Bread to be collections of a few of the sandwich makings that comprise some sandwiches on Lola s menu. And he removes the condiment fragment from the last order to keep things simple. Figure 3-21 shows the result.
Figure 3-21. Redefining the Lunchmeat and Bread tokens Redefining the syntax in this way, where only valid names are given for the Lunchmeat and Bread tokens in the grammar definition, has trapped nonsense orders like Blue on Blue.
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