2: Creating and Using DSLs in C#.NET

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2: Creating and Using DSLs
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<states> <issueState name="Unassigned"> <successors> <issueStateMoniker name="/StateModel/Assigned" /> <issueStateMoniker name="/StateModel/Rejected" /> </successors> </issueState> <issueState name="Resolved" /> <issueState name="Assigned"> <successors> <issueStateMoniker name="/StateModel/Resolved" /> </successors> </issueState> <issueState name="Rejected" /> <startElement name="StartElement1"> <issueState> <issueStateMoniker name="/StateModel/Unassigned" /> </issueState> </startElement> </states> </issueStateModel>
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Notice that all the elements are represented very simply, using lowercase versions of the names in the DSL de nition Links are expressed in a path syntax using the names of the elements This makes the le very easy to read and easy to write processing software for Like everything else, if required, the format can be changed quite substantially within the DSL de nition, and can be changed more radically by writing custom code
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Driving Applications from the DSL The purpose of CJKW s Issue State language is to allow DSL users the authors of Issue Tracking systems to de ne the states and transitions that can be made within an Issue Tracking application
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Devika s initial plan though as we ll see, the team improves on it is to generate part of the application s user interface code from the DSL She envisages that when Dave is writing the code for yet another Issue Tracking system, the Visual Studio project that contains the user interface code will include an Issue State le and one or more text template les that will generate the user interface code When Dave is actually using the DSL, it will be fully installed in his main VS hive, but for test purposes, Devika works in the experimental VS
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She starts the experimental VS either by pressing F5 in the main project or by using the Start VS in Experimental Hive command in the VS SDK section of the Windows Start menu Now she opens the existing code of an Issue Tracking application and nds the le containing the user interface code This is the one she wants to depend on the state diagram First she copies an Issue State le into the application s project Then she proceeds to knock holes in the application code, as we saw earlier, replacing xed pieces of code with the mixture of generated code and DSL-querying code that we saw in Driving the Framework from the DSL earlier in this chapter To complete the transformation to a text template, she adds some essential header information adapted from the sample tt les in the Debugging project and changes the le s extension to tt This automatically creates a subsidiary le containing the generated code Editing the tt le will update the subsidiary cs le Building and running the Issue Tracking application, Devika is satis ed to see that when an issue log is displayed, the state drop-down menu does offer just the next states her state model dictates If necessary, other les in the application can be given the same treatment, progressively turning them into template les and generating their code, which is dependent on the DSL Whole projects full of les can be generated from a single DSL le the DSL designer solution is a good demonstration of this If the state model is changed, all of the les can be regenerated, using guess what the Transform All Templates button This time, we re using it not to generate the code for the language but to generate a target application from an instance of that language
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Devika s solution is shown to customers, who like it But reviewing Devika s prototype, Annie (the analyst) objects to the design She points out that part of the way through many projects, the managers want to rede ne the states and transitions their issues go through It won t really be acceptable to regenerate and rebuild the Issue Tracking application for this purpose Archie (the software architect) suggests a solution The Issue Tracking application should be rewritten to be more generic, storing the set of allowed states and transitions in the issues database itself The DSL will be used to
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