| [AST] How to create a new Expression Statement? [message #167504] |
Wed, 07 July 2004 15:15  |
Eclipse User |
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Originally posted by: jkee.andrew.cmu.edu
Hi,
I want to be able to add statements into an AST because I want to perform
some sort of source code editing (not using the editors). I'm trying to
figure out how to create a new expression statement out of a string,
e.g. System.out.println("foo");
The AST has method newExpressionStatement which takes in an Expression,
but how to create an Expression with my string? Apparently I need some
sort of parser than can build that portion of AST out of the incomplete
compilation Unit. Any pointers? Thanks in advance.
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| Re: [AST] How to create a new Expression Statement? [message #167545 is a reply to message #167504] |
Wed, 07 July 2004 19:46  |
| Eclipse User |
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Originally posted by: olivier_thomannNO.ca.ibm.comSPAM
Le Wed, 7 Jul 2004 15:15:38 +0000 (UTC), jkee@andrew.cmu.edu (Chow) a
écrit :
>The AST has method newExpressionStatement which takes in an Expression,
>but how to create an Expression with my string? Apparently I need some
>sort of parser than can build that portion of AST out of the incomplete
>compilation Unit. Any pointers? Thanks in advance.
You can parse a statement using the org.eclipse.jdt.core.dom.ASTParser
methods. You can then add this statement inside the rest of the tree.
Or you can create the nodes from scratch using the method on the
org.eclipse.jdt.core.dom.AST.
For System.out.println("foo");, you have to create a method invocation
with a string literal as the parameter.
--
Olivier
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| Re: [AST] How to create a new Expression Statement? [message #167599 is a reply to message #167504] |
Wed, 07 July 2004 21:16 |
| Eclipse User |
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Originally posted by: turker.keskinpala.vanderbilt.edu
Hi,
I spent some time to figure out that same issue and thought I would share my
findings. I assume you have a CompilationUnit already but I will write it
down just in case:
//Create parser
parser = ASTParser.newParser( AST.JLS2);
//Set the source of that parser
parser.setSource( source );
CompilationUnit cu = (CompilationUnit) parser.createAST(null);
//This enables the modifications to the cu
cu.recordmodifications
An expression can basically be several things like MethodInvocation,
StringLiteral etc. Let's say you want to create a newIfStatement and set its
expression. You can do this:
IfStatement if_statement = ast.newIfStatement();
if_statement.setExpression(ast.newSimpleName("x"));
//ast.newSimplename("x") is the expression parameter in this case
There is a test code where you can see implementations of AST methods:
http://dev.eclipse.org/viewcvs/index.cgi/org.eclipse.jdt.cor e.tests.model/src/org/eclipse/jdt/core/tests/dom/ASTVisitorT est.java
Hope this helps,
Turker
"Chow" <jkee@andrew.cmu.edu> wrote in message
news:cch42q$b9f$1@eclipse.org...
> Hi,
>
> I want to be able to add statements into an AST because I want to perform
> some sort of source code editing (not using the editors). I'm trying to
> figure out how to create a new expression statement out of a string,
> e.g. System.out.println("foo");
>
> The AST has method newExpressionStatement which takes in an Expression,
> but how to create an Expression with my string? Apparently I need some
> sort of parser than can build that portion of AST out of the incomplete
> compilation Unit. Any pointers? Thanks in advance.
>
>
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