/** @throws SyntaxException if the given string is not a vaild ActionScript 3 expression. */
public Expression newExpression(String expr) {
LinkedListTree ast = AS3FragmentParser.parseExpr(expr);
// ANTLR creates a 'nil' parent node (in case the result is a
// list). We break the link to that parent because we assert
// the parent is null when child nodes are attached elsewhere
// in the tree.
ast.setParent(null);
return ExpressionBuilder.build(ast);
}
public Expression dup(Expression expr) {
LinkedListTree ast = ASTUtils.ast(expr);
return ExpressionBuilder.build(ASTBuilder.dup(ast));
}