| Attaching comments to programatically generated AST [message #249900] |
Fri, 30 November 2007 17:56 |
 Robert Enyedi
Messages: 68
Registered: July 2009 |
Member |
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This is a multi-part message in MIME format.
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Hi,
I am trying to attach comments to specific nodes of a generated Java
AST, based on suggestions found on this newsgroup.
1. If I use an already saved (stringified) source, it works. This is
built by the getAstItemsFromSrc() method.
2. When I programatically build the AST in method getAstItemsFromDom(),
the comment is not attached.
3. I need to keep a reference to specific anchor statements, so adopting
solution 1 (first saving the AST as string and reloading it for rewrite)
is NOT suitable for me.
The complete example is below. I have also attached the
JavaCommentsTest.zip which contains the source bundled as an Eclipse
command line RCP application. Can anybody tell me how to fix solution 2?
getAstItemsFromSrc:
<code>
protected ASTNode[] getAstItemsFromSrc() {
ASTParser parser = ASTParser.newParser(AST.JLS3);
String src="class CommentsTest {\n" +
" void dummy(){\n" +
" return;\n" +
" }\n" +
"}";
parser.setSource(src.toCharArray());
CompilationUnit refCompilationUnit =
(CompilationUnit) parser.createAST(null);
refCompilationUnit.recordModifications();
MethodDeclaration dummyMethod =
(MethodDeclaration)
((TypeDeclaration)refCompilationUnit.types()
.get(0)).bodyDeclarations().get(0);
Block block = dummyMethod.getBody();
Statement dummyStmt = (Statement) block.statements().get(0);
return new ASTNode[]{refCompilationUnit, dummyStmt};
}
</code>
getAstItemsFromDom:
<code>
protected ASTNode[] getAstItemsFromDom() {
ASTParser parser = ASTParser.newParser(AST.JLS3);
String src= "";
parser.setSource(src.toCharArray());
CompilationUnit refCompilationUnit =
(CompilationUnit) parser.createAST(null);
AST ast = refCompilationUnit.getAST();
refCompilationUnit.recordModifications();
TypeDeclaration type = ast.newTypeDeclaration();
type.setName(ast.newSimpleName("CommentsTest"));
MethodDeclaration dummyMethod = ast.newMethodDeclaration();
dummyMethod.setName(ast.newSimpleName("dummy"));
dummyMethod.setReturnType2(
ast.newPrimitiveType(PrimitiveType.VOID));
type.bodyDeclarations().add(dummyMethod);
Block block = ast.newBlock();
Statement dummyStmt = ast.newReturnStatement();
block.statements().add(dummyStmt);
dummyMethod.setBody(block);
refCompilationUnit.types().add(type);
return new ASTNode[]{refCompilationUnit, dummyStmt};
}
</code>
The caller is:
<code>
protected void addComments() throws Exception {
ASTNode[] astItems = getAstItemsFromSrc();// This works
// ASTNode[] astItems = getAstItemsFromDom();// This does NOT work
CompilationUnit refCompilationUnit = (CompilationUnit)
astItems[0];
Statement dummyStmt = (Statement) astItems[1];
System.out.println("WITHOUT COMMENTS: " + refCompilationUnit);
ASTRewrite rewrite= ASTRewrite.create(
refCompilationUnit.getAST());
IDocument idoc= new Document(refCompilationUnit.toString());
// insert block comment as first statement
StringBuffer comment = new StringBuffer();
comment.append("// Line comment");
ASTNode placeHolder=
rewrite.createStringPlaceholder(comment.toString(),
ASTNode.EMPTY_STATEMENT);
ListRewrite list = rewrite.getListRewrite(dummyStmt.getParent(),
Block.STATEMENTS_PROPERTY);
list.insertBefore(placeHolder, dummyStmt,null);
TextEdit edits = rewrite.rewriteAST(idoc, null);
edits.apply(idoc);
System.out.println("WITH COMMENTS: " + idoc.get());
}
</code>
Thanks,
Robert
--------------060800010701040103030703
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