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Noob Eclipse AST Conundrum [message #1016261]

Tue, 05 March 2013 12:31

Scott Dudley
Messages: 6
Registered: October 2012

Junior Member

If this isn't the correct forum and audience for AST-related questions, please pardon the intrusion.

I need to write a one-off ditty to parse a large set of java source files searching for assignment or comparison operation on arrays (not individual array elements).

I've read several howto's and well-written articles that provided sufficient fodder that I got close to my target - but no dice. Could use some help.

I'm thinking that it could all be done with two visitors - one for Assignment and the other, IfStatement. My conundrum lies in my ability (or lack thereof) to intuit the API and the DOM structure.

For instance, in the following snippet, how do I ascertain whether or not Expression left is an array (from within this Assignment visitor)?

            public boolean visit(Assignment node) {
                
                Expression left = node.getLeftHandSide();
                if (left instanceof QualifiedName)
                    System.err.println(((QualifiedName) left).getFullyQualifiedName());
                else if (left instanceof SimpleName) {
                    System.err.println(((SimpleName) left).getIdentifier());
                }

Same of IfStatement. How do I relate the InfixExpression.getLeftOperand() to it's data type and identify whether or not it's an array.

Very much appreciate any insight.

Attachment: ArrayExample.java
(Size: 0.32KB, Downloaded 20 times)

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Re: Noob Eclipse AST Conundrum [message #1016263 is a reply to message #1016261]

Tue, 05 March 2013 12:49

Olivier Thomann
Messages: 517
Registered: July 2009

Senior Member

You should create your AST with binding resolution enabled and check the binding of the expression.
public boolean visit(Assignment node) {

Expression left = node.getLeftHandSide();
ITypeBinding binding = left.resolveTypeBinding();
if (binding.isArray()) {
....
}
...
return true;
}

Make sure you provide the right environment to properly resolve the bindings.

HTH,

Olivier

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Re: Noob Eclipse AST Conundrum [message #1016267 is a reply to message #1016263]

Tue, 05 March 2013 13:07

Scott Dudley
Messages: 6
Registered: October 2012

Junior Member

Quote:

Make sure you provide the right environment to properly resolve the bindings.

That may be my problem Olivier. In the attached, the ITypeBinding is null.

What am I missing?

Attachment: AssignmentVisitorTest.java
(Size: 2.16KB, Downloaded 15 times)

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Re: Noob Eclipse AST Conundrum [message #1016271 is a reply to message #1016267]

Tue, 05 March 2013 13:53

Olivier Thomann
Messages: 517
Registered: July 2009

Senior Member

You might want to check the methods
org.eclipse.jdt.core.dom.ASTParser.setEnvironment(String[], String[], String[], boolean) and org.eclipse.jdt.core.dom.ASTParser.setUnitName(String)
You need to provide the required classpath entries so that the bindings can be resolved. This is explained in the javadoc of the org.eclipse.jdt.core.dom.ASTParser.setResolveBindings(boolean) method.

Let me know if you have more questions.

Olivier

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