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POANTLR Tree Grammar and StringTemplate Code Translation
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  1. POANTLR Tree Grammar and StringTemplate Code Translation
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    copied!<p>I am working on a code translation project with a sample ANTLR tree grammar as:</p> <pre><code>start: ^(PROGRAM declaration+) -&gt; program_decl_tmpl(); declaration: class_decl | interface_decl; class_decl: ^(CLASS ^(ID CLASS_IDENTIFIER)) -&gt; class_decl_tmpl(cid={$CLASS_IDENTIFIER.text}); </code></pre> <p>The group template file for it looks like:</p> <pre><code>group My; program_decl_tmpl() ::= &lt;&lt; *WHAT?* &gt;&gt; class_decl_tmpl(cid) ::= &lt;&lt; public class &lt;cid&gt; {} &gt;&gt; </code></pre> <p>Based on this, I have these questions: </p> <ul> <li>Everything works fine apart from that what I should express in <code>WHAT?</code> to say that a program is simply a list of class declarations to get the final generated output? </li> <li>Is this approach <strong>averagely</strong> suitable for not so a high-level language? </li> <li>I have also studied <a href="http://www.antlr.org/wiki/display/ST/Language+Translation+Using+ANTLR+and+StringTemplate" rel="nofollow">ANTLR Code Translation with String Templates</a>, but it seems that this approach takes much advantage of interleaving code in tree grammar. Is it also possible to do it as much as possible <em>just</em> in String Templates? </li> </ul> <p><strong>SOLUTION</strong>, I add the solution based on what Terence proposed: </p> <pre><code>start: ^(PROGRAM d+=declaration+) -&gt; program_decl_tmpl(decls={$d}); declaration: cd = class_decl -&gt; decl_tmpl(decl={$cd.st}) | id = interface_decl -&gt; decl_tmpl(decl={$id.st}); class_decl: ^(CLASS ^(ID CLASS_IDENTIFIER)) -&gt; class_decl_tmpl(cid={$CLASS_IDENTIFIER.text}); </code></pre> <p>And the templates would be:</p> <pre><code>group My; program_decl_tmpl(decls) ::= &lt;&lt; &lt;decls&gt; &gt;&gt; decl_tmpl(decl) ::= &lt;&lt; &lt;decl&gt; &gt;&gt; class_decl_tmpl(cid) ::= &lt;&lt; public class &lt;cid&gt; {} &gt;&gt; </code></pre>
 

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