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| </div><div id='content' class='page-1'><div class='row'><div class='row-fluid'><div class='col-lg-3'><ul class='nav-sidebar'><li class='active'><a href='#doc'>GEP-5</a></li><li><a href='#_abstract_what_is_a_file_extension_dependent_ast_transformations' class='anchor-link'>Abstract: What is a file extension dependent AST transformations?</a></li><li><a href='#_urls' class='anchor-link'>URLs</a></li><li><a href='#_update_history' class='anchor-link'>Update history</a></li></ul></div><div class='col-lg-8 col-lg-pull-0'><a name='doc'></a><h1>GEP-5</h1><p>Author: <i/></p><hr/><div id="preamble"> |
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| <div class="title">Metadata</div> |
| <div class="hdlist"> |
| <table> |
| <tr> |
| <td class="hdlist1"> |
| <strong>Number</strong> |
| </td> |
| <td class="hdlist2"> |
| <p>GEP-5</p> |
| </td> |
| </tr> |
| <tr> |
| <td class="hdlist1"> |
| <strong>Title</strong> |
| </td> |
| <td class="hdlist2"> |
| <p>File extension dependent AST transformations</p> |
| </td> |
| </tr> |
| <tr> |
| <td class="hdlist1"> |
| <strong>Version</strong> |
| </td> |
| <td class="hdlist2"> |
| <p>2</p> |
| </td> |
| </tr> |
| <tr> |
| <td class="hdlist1"> |
| <strong>Type</strong> |
| </td> |
| <td class="hdlist2"> |
| <p>Feature</p> |
| </td> |
| </tr> |
| <tr> |
| <td class="hdlist1"> |
| <strong>Status</strong> |
| </td> |
| <td class="hdlist2"> |
| <p>Rejected</p> |
| </td> |
| </tr> |
| <tr> |
| <td class="hdlist1"> |
| <strong>Comment</strong> |
| </td> |
| <td class="hdlist2"> |
| <p>A general compiler configuration mechanism was adopted instead and delivered in Groovy 1.8</p> |
| </td> |
| </tr> |
| <tr> |
| <td class="hdlist1"> |
| <strong>Leader</strong> |
| </td> |
| <td class="hdlist2"> |
| <p>Alex Tkachman</p> |
| </td> |
| </tr> |
| <tr> |
| <td class="hdlist1"> |
| <strong>Created</strong> |
| </td> |
| <td class="hdlist2"> |
| <p>2010-02-26</p> |
| </td> |
| </tr> |
| <tr> |
| <td class="hdlist1"> |
| <strong>Last modification</strong>  |
| </td> |
| <td class="hdlist2"> |
| <p>2018-10-12</p> |
| </td> |
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| </div> |
| <div class="sect1"> |
| <h2 id="_abstract_what_is_a_file_extension_dependent_ast_transformations">Abstract: What is a file extension dependent AST transformations?</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>AST transformations is powerful tool for creating DSLs. Two ways to define AST transformations exist today - via annotation and global transformation, which apply to everything. This proposal introduce new type - transformations, which apply only to source files with given extension.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Such approach gives possibility to have better and unified way to organize code base containing groovy based DSLs.</p> |
| </div> |
| <div class="sect2"> |
| <h3 id="_how_to_implement">How to implement?</h3> |
| <div class="paragraph"> |
| <p>There are two problems to be addressed:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>how to make AST transformation extension aware</p> |
| </li> |
| <li> |
| <p>how to make Groovyc or FileSystemCompiler or even IDE aware about additional (to *.groovy) extensions to be compiled |
| Interesting that first problem doesn’t require any specific handling at all. Global AST transformation can use name of SourceUnit to filter what files to process.</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>For second problem file <code>META-INF/services/org.codehaus.groovy.transform.ASTTransformation</code> where global AST transformations normally defined can be used. To keep things backward compatible following syntax is suggested</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="prettyprint highlight"><code>#files:<ext1>,<ext2>...</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>The main benefit of using configuration files are:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>new frameworks using AST based transformations make compiler aware about files to be compiled just by dropping in to classpath</p> |
| </li> |
| <li> |
| <p>it is very easy for any incarnation of compiler (FileSystemCompiler or Groovyc or whatever) to scan classpath and find extensions to be compiled</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_urls">URLs</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><a href="https://groovy.markmail.org/thread/jahqbj6su5ddvuah">groovy-dev: GEP 5 - file extension based AST transformations</a></p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_update_history">Update history</h2> |
| <div class="sectionbody"> |
| <div class="dlist"> |
| <dl> |
| <dt class="hdlist1">1 (2010-02-16)</dt> |
| <dd> |
| <p>Version as extracted from Codehaus wiki</p> |
| </dd> |
| <dt class="hdlist1">2 (2018-10-14)</dt> |
| <dd> |
| <p>Numerous minor tweaks</p> |
| </dd> |
| </dl> |
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