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POC++ Code insertion using antlr and the line directive
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copied!<p>I am using antlr to translate a custom language to C++ code. In this language, user can embed C++ code snippets between <code>$code...$endcode</code> directives, that gets inserted into the translated C++code as-is.</p> <p>I have the following problem: When there is an error in the code snippet I would like the compiler to point to the source file rather than the translated C++ code.</p> <p>I tried using line directives as follows, but it didn't work:</p> <pre><code>"foo.custom_laguage" 1 $code 2 ...some c++ code... 3 $endcode </code></pre> <p>gets translated to </p> <pre><code>"auto-generated.cpp" 42 #line 2 "foo.custom_language" 43 ...some c++ code... 44 #line __LINE__ __FILE__ </code></pre> <p>This doesn't work, I think because #line directive modifies what gets written by the <code>__LINE__</code> macro later. How can I set line number back to the <em>actual</em> line number in the translated C++ code? How does antlr do this? </p> <p>Here is what I want the auto-generated code to look like:</p> <pre><code>"auto-generated.cpp" 42 #line 2 "foo.custom_language" 43 ...some c++ code... 44 #line 44 "auto-generated.cpp" //actual line in this file 45 ..some more C++ code ... </code></pre> <p><strong>edit:</strong> I just found out that there is a way to do this in C# language by using a <code>#line default</code> directive: <a href="http://msdn.microsoft.com/en-us/library/34dk387t.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/34dk387t.aspx</a> But couldn't find anything similar for C++</p>

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