Question

I have selected a piece of code and I want to parse with AST with the purpose of identify methods in the selected code.

public void run(IAction action) {
    SelectedText selectedText;      
    IEditorPart editor = getActiveEditor();

    if (editor instanceof AbstractTextEditor) {
        selectedText = getSelectedText(editor);
        creteAST(selectedText);
    }           
}

private void creteAST(SelectedText selectedText) {
    CompilationUnit parse = parse(selectedText);
    MethodVisitor visitor = new MethodVisitor();
    parse.accept(visitor);

    System.out.println("Printing methods from the selected code");
    for (MethodDeclaration method : visitor.getMethods()) {
        System.out.println("Method name: " + method.getName()+ ". Return type: " + method.getReturnType2());
        System.out.println(method);
    }
}

private static CompilationUnit parse(SelectedText selectedText) {
    String s_text = selectedText.getSelectedText();
    char[] c_text = s_text.toCharArray();
    ASTParser parser = ASTParser.newParser(AST.JLS3);
    parser.setKind(ASTParser.K_COMPILATION_UNIT);
    parser.setSource(c_text);
    parser.setResolveBindings(true);
    return (CompilationUnit) parser.createAST(null);
  }

As you can see, I have to change the type from SelectedText to char[] before parsing.

I am doing something wrong because the parser does not find any method.

What I am doing wrong?

Answer 1

javadoc for ASTParser.setResolveBindings() says:

Binding information is obtained from the Java model. This means that
the compilation unit must be located relative to the Java model. This
happens automatically when the source code comes from either
setSource(ICompilationUnit) or setSource(IClassFile). When source is
supplied by setSource(char[]), the location must be extablished
explicitly by calling setProject(IJavaProject) and
setUnitName(String). Note that the compiler options that affect doc
comment checking may also affect whether any bindings are resolved for
nodes within doc comments.

IJavaProject javaProject = ...obtain it somehow, possibly through getAdapter() on editor?
String name = ...from editor?...

ASTParser parser = ASTParser.newParser(AST.JLS3);
parser.setKind(ASTParser.K_COMPILATION_UNIT);
parser.setSource(c_text);
parser.setResolveBindings(true);
parser.setProject(javaProject);
parser.setUnitName(name);
return (CompilationUnit) parser.createAST(null);