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How to turn an expression String into an Xtext object? [message #785840]

Sun, 29 January 2012 15:34

Uli B

Messages: 36
Registered: January 2012

Member

Hello,

I have a DSL and a Debugger with Xtext 2.1.1 under Eclipse 3.7. Now I want to add an "Expressions View". When the expression view calls MyDslWatchExpressionDelegate.evaluateExpression(), the expression is passed as a String. So my question is, how can I turn this String into an Xtext object to which the MyDsl document is linked somehow, so that the expression can be evaluated considering references to the document. (I have a calculator like that from the Xtext arithmetics example in place.)
For example, if we had in a .mydsl document (don't care for the actual language) something like

...
int a = 3
int b = 4
...

the user might enter "a + b" in the expression view, and MyDslWatchExpressionDelegate.evaluateExpression() will be called with "a + b". How can I turn "a + b" into an object that can be passed to the calculator's evaluate function?

I could parse the string as a new document, but I don't know how to link the original document to the new one so that a and b could be referenced correctly.

Many thanks in advance for any kind of hint.

Uli

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Re: How to turn an expression String into an Xtext object? [message #1006816 is a reply to message #785840]

Sat, 02 February 2013 11:37

Alexis Drogoul

Messages: 5
Registered: July 2010

Junior Member

Hi,

It's been a year now and no answer to your request... Unfortunately, I do not have one myself, but it happens that I would like exactly what you were looking for. Did you receive any suggestion ? Implement this by yourself ? In any case, I would be interested by the solution you have chosen.

Thanks !

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Re: How to turn an expression String into an Xtext object? [message #1006819 is a reply to message #1006816]

Sat, 02 February 2013 12:00

Christian Dietrich

Messages: 14716
Registered: July 2009

Senior Member

Hi,

am not quite sure what you want to do (standalone, in eclipse ...),

but you can obtain a project aware resourceset using org.eclipse.xtext.ui.resource.IResourceSetProvider.
and you can load a resource from a string using org.eclipse.emf.ecore.resource.Resource.load(InputStream, Map<?, ?>)

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

[Updated on: Sat, 02 February 2013 12:04]

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