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CHAPTER 9 CODE GENERATION
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Administration overhead. Having the files for delivery automatically generated clearly removes administration overhead from the scripts themselves. Administration is then targeted solely at the master settings file. This minimizes the need to understand the entire build process for the administration user and opens the door for automatic production of this master file from some systems catalog or control center, which in turn could mean a friendly UI for the management of delivery scripts. So there is some virtue in investigating code generation techniques to further aid the delivery effort. At this point, we will move on from the argument itself, and investigate the use of code generation to provide build scripts.
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Tools for the Task
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There are a couple of major options for code generation in this instance: the use of XSLT, or the use of some other code-generation harness.
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Basic File Manipulation
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By basic file manipulation I mean the use of file manipulation techniques such as AWK or even NAnt s own filterchain functionality (see 3) to perform token replacement of varying degrees of sophistication. For example, regular expressions can perform some clever token replacement beyond that of Search and Replace.
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XSLT is the natural choice for the transformation of XML into some other XML (or indeed another file type). However, in this instance we will be taking a single XML source file and producing multiple new XML files. This means that the process is not simply a case of producing the XSLT required for transformation. There needs to be other constructs and a framework to ensure the production of the required files. This in itself is not such a serious problem. It is something of a cop-out because I am not very good at XSLT. If, like me, you find using XSLT a bit confusing, you might want to consider the next option.
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Actually, CodeSmith is not the only option several tools of the same ilk are available. CodeSmith (www.ericjsmith.net/codesmith) is a code-generation application. It allows the production of template files, which are compiled and executed against supplied parameters allowing the generation of all manner of code files. Generally, these tools are seen as a useful way to provide such services as data access layers for applications (though if you are interested in this, I might suggest LLBLGen Pro [www.llblgen.com] or other similar tools built specifically for that task), but in fact code generation can be used in many places to enhance productivity. CodeSmith comes in two flavors: the first is the free download that can be used to compile and run the template files (.cst); the second is the CodeSmith Studio application that offers an environment for the production of the template files, and improved feedback on
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CHAPTER 9 CODE GENERATION
template generation. It costs a little, but if you become code generation infected, then it is well worth the cost. I imagine that you will save the expense in no time at all once you put the tool to use.
On the CodeSmith web site, many people contribute templates and the like for anything from data Tip
access to design pattern implementations. It is a very useful resource.
What are the advantages and disadvantages of each approach Table 9-1 shows the differences. Table 9-1. Comparing Code-Generation Techniques
Feature
Easy to use Platform portability Harness/scaffolding present Handles decision-making logic
Token Replacement
XSLT
CodeSmith
Both XSLT and CodeSmith are likely to be the most useful for the process, thanks to the power and flexibility they deliver. We will use both of these technologies to deliver code generation to our processes. We will look at the scaffolding to harness XSLT to deliver the files we need and also see how CodeSmith can deliver the same. It is worth investigating a text on XSLT (see Further Reading ) since it is too large a subject to consider in depth here. There is no other reference on CodeSmith, apart from the help files, so let us begin with it.
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