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[XPAND] perform OAW code without creating physical files [message #503986]

Wed, 16 December 2009 17:34

Caroline Bourdeu d'Aguerre

Messages: 6
Registered: July 2009

Junior Member

Hi all,

I am looking for a M2T technology. i want to execute a transformation code that I have exctracted from a file. The code transformation is in a string. Is it possible to execute an OAW transformation without create a physical file (xpt) ?

Thank in advance,

Caroline

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Re: [XPAND] perform OAW code without creating physical files [message #504044 is a reply to message #503986]

Wed, 16 December 2009 22:17

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Hello Caroline,

afaik this is not possible out of the box. it may be possible by hooking into some internals of Xpand e.g. like this

import java.io.Reader;
import java.io.StringReader;

import org.eclipse.internal.xpand2.ast.Template;
import org.eclipse.internal.xpand2.parser.XpandParseFacade;
import org.eclipse.xpand2.XpandExecutionContextImpl;
import org.eclipse.xpand2.XpandFacade;
import org.eclipse.xpand2.output.Outlet;
import org.eclipse.xpand2.output.OutputImpl;
import org.eclipse.xtend.expression.Resource;


public class XpandRunner {
	
	public static void main(String[] args) {
		OutputImpl out = new OutputImpl();
		out.addOutlet(new Outlet("src-gen"));
		XpandExecutionContextImpl ctx = new XpandExecutionContextImpl(out, null) {
			
			private Template template;
			
			@Override
			public Resource currentResource() {
				if (template == null) {
					String templateString = "«DEFINE test FOR String»«FILE \"test.txt\"»Hello «this»«ENDFILE»«ENDDEFINE»";
					Reader r = new StringReader(templateString );
					template = XpandParseFacade.file(r , "sample/test.xpt");
				}
				return template;
			}
		};
		
		
		XpandFacade.create(ctx).evaluate("test", "Welt", new Object[] {});
	}

}

but this may not be neccesary. can you tell more about your usecase. that do you mean with "exctracted from a file" ?

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: [XPAND] perform OAW code without creating physical files [message #504179 is a reply to message #504044]

Thu, 17 December 2009 15:20

Caroline Bourdeu d'Aguerre

Messages: 6
Registered: July 2009

Junior Member

Thank you for your quick reply,

I have extracted from a file a code which is now in a string like:

String myCode = 
"«DEFINE Root(String fileName) FOR Package»
	«FILE fileName+".docbook"	-»
<?xml version='1.0' encoding="ISO-8859-15" ?>
<book lang="en">
		«EXPAND PackageChapter FOREACH ownedElement-»
</book>
	«ENDFILE»
«ENDDEFINE»";

is it possible to execute this code with out create a xpt file

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