| Analyzing IF statements using Eclipse ASTParser [message #246307] |
Sun, 29 July 2007 16:13  |
Eclipse User |
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Originally posted by: nitrousfiz.googlemail.com
Hi,
I want to differentiate between the two if statements by parsing using
Eclipse ASTParser.
The if statements are -
if (c==1)
if (a<10 && b>0)
Using the visitor pattern I am able to identify both statements as
"ifstatement"s...
Now, I also need to count "how many" conditions/branches are inside the
statement.
For example, in the 1st if statement above, there is 1 condition (c==1) and
in the second if statement above there are two conditions (a<10 and b>0).
Please advice how can I find how many branches are inside the ifstatement.
A reply with a small example will be very appreciated as I am a newbie to
the ASTParser.
Thanks for your help in advance.
Regards,
Fayezin
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| Re: Analyzing IF statements using Eclipse ASTParser [message #246336 is a reply to message #246307] |
Mon, 30 July 2007 11:35  |
| Eclipse User |
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Originally posted by: myawn.ebay.com
Fayezin Islam wrote:
> Hi,
>
> I want to differentiate between the two if statements by parsing using
> Eclipse ASTParser.
>
> The if statements are -
> if (c==1)
> if (a<10 && b>0)
>
> Using the visitor pattern I am able to identify both statements as
> "ifstatement"s...
>
> Now, I also need to count "how many" conditions/branches are inside the
> statement.
>
> For example, in the 1st if statement above, there is 1 condition (c==1) and
> in the second if statement above there are two conditions (a<10 and b>0).
>
> Please advice how can I find how many branches are inside the ifstatement.
>
> A reply with a small example will be very appreciated as I am a newbie to
> the ASTParser.
>
> Thanks for your help in advance.
>
> Regards,
>
> Fayezin
>
>
I'd recommend downloading the ASTView plug-in from
http://www.eclipse.org/jdt/ui/astview/index.php; then you can examine
the AST view of various snippets of code and see exactly what the AST
representation is. This will allow you to distinguish between the cases
above, or any others.
To answer your specific question, in both cases the IfStatement contains
an expression (an InfixExpression). You can examine either the operands
or the operator to distinguish the two:
In the first example (c==1), the operator is '==', the left operand is a
SimpleName, and the right operand is a NumberLiteral.
In the second example, the operator is &&, and both the left and right
operands are InfixExpressions (which you can dive deeper into).
So if you're just trying to distinguish simple expressions from compound
expressions, you could look at the operand types and see if they are
instances of Expressions, or of simple types.
I think you might want to do something like clear a counter at your
IfStatement visitor, and then have an InfixExpression visitor that
increments the counter, if your primary requirement is just to find the
number of conditions being tested.
Hope that helps,
Mike
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