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CHAPTER 3 DOMAIN-SPECIFIC LANGUAGES 101: LOLA S LUNCH COUNTER
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Figure 3-3. Changing to the DSL Grammar mode Once you re in the DSL Grammar mode, you see a new DSL menu on the main title bar (between View and Help), as shown in Figure 3-4. Norm clicks the DSL menu and selects Split New Input and Output Views. (Another way to invoke this mode is the Ctrl-Shift-T key combo.)
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Figure 3-4. Selecting the three-way Split view from the DSL menu Now you see three views (shown in Figure 3-5), but they only address two new buffers: untitled1 and untitled2. (See 2 for an explanation of buffers.) The left pane is where you will start entering your DSL statements. The view in this pane is essentially in Standard mode, but it shows untitled1 Mode in the pane title banner. This means that the input DSL statements in the left pane will be processed using the DSL Grammar module you ll be creating in the untitled1 (center pane) buffer. The right pane, in M Graph mode, is read-only and will show the M code generated by the DSL Grammar module you will be creating in the untitled1 pane. Going from left to right in this Intellipad window then, the left pane contains the input DSL statements, the center pane contains your DSL Grammar definition for processing these DSL statements, and the right pane shows the resulting (read-only) output M Graph.
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CHAPTER 3 DOMAIN-SPECIFIC LANGUAGES 101: LOLA S LUNCH COUNTER
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Figure 3-5. Initial Intellipad window after selecting Split New Input and Output Views Norm: Let s start by writing an order for your most popular sandwich in the left pane. Lola: Okay that would be pastrami on rye. And she enters the order Pastrami on Rye. in the left untitled2 pane. (Intellipad appends an asterisk to the buffer name as soon as she types the first character, since the buffer has been changed but not saved.) Figure 3-6 shows the results of Lola s typing.
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Figure 3-6. The first line of the SandwichOrders DSL Nothing happens in the other two panes, since you haven t defined any grammar to process Lola s sample order. To get started, Norm sets up a bare-bones DSL Grammar definition in the center pane to see if it will generate some M language output in the right pane (see Figure 3-7).
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Figure 3-7. The simplest possible DSL Grammar definition that works Let s review what you are seeing in the center (grammar definition) and right (M graph output) panes. The center pain contains a complete (if impractical) DSL Grammar definition. All DSL Grammar definitions in fact all M language programs must be contained in one or more modules. In M, a module is a namespace or unit of compilation. (In reality, an M file is the unit of compilation. But I will try to follow the convention of defining only one module per file.) I ll name this module LunchCounter to correspond with the domain you re addressing. Within this module, you have defined a DSL language called SandwichOrders, containing one simple rule. A requirement in DSL grammar definitions is that there must always be a Main syntax rule. A DSL module
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CHAPTER 3 DOMAIN-SPECIFIC LANGUAGES 101: LOLA S LUNCH COUNTER
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can contain any number of syntax rules, but the required Main rule is the top-level rule to which all input statements or documents must conform in order to be valid within the grammar definition of the language. So far, you ve set up a language that will accept only the statement "Pastrami on Rye." If this is your system, then as long as a customer orders only pastrami on rye, you re good. Anything else will generate an error. Norm has made sure that Lola s sample order includes a period at the end, and he s included the period as part of his Main syntax rule definition. In the present context, this isn t important because the system will be well defined, even if it is nonsense to a human reader, as long as the input DSL sequence of characters (string) matches the string expected by the grammar definition. But later on, Norm expects to use a period to tell the system it has reached the end of a SandwichOrders statement. In the right pane of Figure 3-7, you see that the input DSL and the simple-minded DSL Grammar definition have generated an M language program (termed an M Graph).
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