[rules-users] [MVEL]user typed in free format expression and advanced property/expression handler integration issue

I have been trying and evaluating MVEL in past few days and in general, I love this small kids but with 1 doubt needs ask for suggestions here. The key scenario is, we have an UI to allow users type in free format expression and we have a couple of custom property/variable even expression handler classes needs to be integrated with. Example sub-expression: 1) person.name.isVisiable --> Please note, the isVisisble is not a java property of name (it is name field's meta data which requires a quite different resolver other than how we resolve the person and how we resolve to name field). 2) person.name --> normal property resolver. Now with the user typed in expression: (person.name.isVisiable == true) && (person.name == "Joe Wang"), what is the best way to utilize MVEL to be able to parse/compile and execute this expression? the first thing the API needs to know is whether it is a meta field evaluation or a normal java property evaluation, there is no such clue on user typed in expression unless we can parse the expression and scan its full text like 'person.name.isVisiable' The thing I am currently looking at is @Interceptor or custom function, and looking for a way to be able to translate the expression into an easier format like (@meta person.name.isVisiable == true) && (person.name == "Joe Wang"). Is there any API in MVEL exists can make such transformation easier? Or maybe we can use a hidden field on UI to append @meta tag when user types in? Once 1st question is satisfied, the next one should be how we should proceed @meta interceptor with the ASTNode passed in. Looking forward to your comments. Thanks. ----- Ivan, your Panda, forever -- View this message in context: http://drools.46999.n3.nabble.com/MVEL-user-typed-in-free-format-expressi... Sent from the Drools: User forum mailing list archive at Nabble.com.