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The DSL Tools documentation has a very comprehensive walkthrough of building your own custom host in the section entitled Walkthrough: Creating a Custom Text Template Host
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Custom Directive Processor Earlier in the chapter, we discussed how the directive processor generated as a standard part of a DSL can be used with a custom directive in a template to read in model les and add NET properties to the template to access the root of that model le, for example:
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<#@ issueProjectModel processor="IssueProjectsDirectiveProcessor" requires="fileName='HealthProjectissueProjects'" provides="IssueProjectModel=IssueProjectModel" #>
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If you need to process other kinds of data within a template, for example, to combine model data with an XML le that you don t have a DSL for, you can add further custom directive processors to bring that data into the environment of the template for processing As we ve seen in the architecture section, a text template is converted into a NET class ultimately derived from the abstract class TextTransformation, called the transformation class This class is compiled and run in the host-supplied AppDomain via an override of the following methods:
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public abstract void Initialize(); public abstract string TransformText();
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It is this latter method that returns the string text that forms the output of the processing engine Now that we know the mechanism by which templates run in the engine, we can deal with how to load data into them The canonical behavior for a directive processor is to add a property to the transformation class that transparently allows code in the template to access the data To realize this, directive processors are given an opportunity to inject code into the transformation class The principal task when creating a custom directive processor is to decide what this code should be and to parameterize it with the parameters supplied by the custom directive that invokes the directive processor As discussed, this code may likely be running in a clean AppDomain and so cannot directly rely on the current in-memory data held by the rest of Visual Studio; instead, it must be able to initialize the data from scratch There are a couple of strategies for achieving this Inject code that contains a call to data-loading code using a parameter such as a lename taken from the custom directive Use the parameters from the custom directive to acquire the data and then serialize it into a blob; inject code that contains the blob and a call to deserialize it Either of these strategies can be augmented by various caching techniques or special code to communicate between AppDomains to retrieve data These techniques are beyond the scope of this book, but in any case, they can only be a backup to the fundamental requirement to be able to load the data in a clean AppDomain Again, the DSL Tools documentation is helpful in this area, and the walkthrough Creating a Custom Directive Processor explains in detail the process for creating a directive processor that uses the rst strategy just mentioned to load an XML le and provide its DOM as a parameter It s worth noting that if you are only concerned with running your templates inside one particular host, you can set the hostSpecific parameter on your <#@template #> directive and acquire a reference in the template s
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Advanced Customizations AppDomain to the instance of the host object in the original AppDomain This
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can make data acquisition a little easier For example, a template that is coupled to the Visual Studio host supplied with the DSL Tools can use this mechanism to acquire the Visual Studio DTE object in the template and thus write templates that interact with the project system and the many other objects available via DTE Here s an example:
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<#@ template debug="true" hostspecific="true" #> <#@ output extension="txt" #> <#@ assembly name="EnvDTE" #> <#@ import namespace="EnvDTE" #> Get the names of the projects in the Debugging solution from Dte <# DTE dte = ((IServiceProvider)thisHost)GetService(typeof(DTE)) as DTE; if (dte != null) { foreach (Project project in dteSolutionProjects) { #> Project: <#= projectName #> <# } } #>
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The preceding simple template produces the following output when run in a typical DSL Tools Debugging project:
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