how to get location (#-th line) of EObject in original document?

Question

The followings are my grammar rules:

Stmts: (stmts += Stmt ';')* ;
Stmt: Stmt1 | Stmt2 | Stmt3 ... ;

I want to know each Stmt# is #-th stmt in stmts and their exactly location (#-th line in original document). Such that I could point out the location when user make mistakes.

I override the validator constructor and store an HashMap <Stmt, Integer> to get each Stmt# is the #-th Stmt in stmts(Not sure if this is the correct way to do though...). However I have no idea how to get their line number.

Any help?

Answer 1

Given an EObject you can easily get the position in the source file using org.eclipse.xtext.nodemodel.util.NodeModelUtils.getNode(EObject).

For example:

    INode node = NodeModelUtils.getNode(o);
    System.out.println(String.format("Node goes from line %s to line %s",node.getStartLine(), node.getEndLine()));