How to convert add line numbers to the parseTree.

[kasun kavinda]

I am trying to build a javascript parser using the antlr.

I want to Add line numbers of my source code to the parse Tree. Is there a way to do that. for now it gives the below output below 

(program (sourceElements (sourceElement (statement (functionDeclaration function a ( ) { (functionBody (sourceElements (sourceElement (statement (variableStatement (varModifier var) (variableDeclarationList (variableDeclaration a = (singleExpression (literal (numericLiteral 10))))) (eos ;)))) (sourceElement (statement (ifStatement if ( (expressionSequence (singleExpression (singleExpression a) > (singleExpression (literal (numericLiteral 20))))) ) (statement (block { (statementList (statement (expressionStatement (expressionSequence (singleExpression (singleExpression a) = (singleExpression (singleExpression a) + (singleExpression (literal (numericLiteral 1)))))) (eos ;)))) })) else (statement (block { (statementList (statement (expressionStatement (expressionSequence (singleExpression (singleExpression a) = (singleExpression (singleExpression a) - (singleExpression (literal (numericLiteral 1)))))) (eos ;)))) }))))))) })))) <EOF>)

But i need a JSON output like this(This output is from nashorn parser)

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How to do that with the antlr4 in java.?