function setJumpSelection(start, end, isFunction) {

                /**
                 * helper function to decide if the tokens on the RHS of an assignment
                 * look like an identifier, or member expr.
                 */
                function validIdOrProp(token) {
                    if (!token) {
                        return false;
                    }
                    if (token.string === ".") {
                        return true;
                    }
                    var type = token.type;
                    if (type === "variable-2" || type === "variable" || type === "property") {
                        return true;
                    }

                    return false;
                }

                var madeNewRequest = false;

                if (isFunction) {
                    // When jumping to function defs, follow the chain back
                    // to get to the original function def
                    var cursor = {line: end.line, ch: end.ch},
                        prev = session._getPreviousToken(cursor),
                        next,
                        offset;

                    // see if the selection is preceded by a '.', indicating we're in a member expr
                    if (prev.string === ".") {
                        cursor = {line: end.line, ch: end.ch};
                        next = session.getNextToken(cursor, true);
                        // check if the next token indicates an assignment
                        if (next && next.string === "=") {
                            next = session.getNextToken(cursor, true);
                            // find the last token of the identifier, or member expr
                            while (validIdOrProp(next)) {
                                offset = session.getOffsetFromCursor({line: cursor.line, ch: next.end});
                                next = session.getNextToken(cursor, false);
                            }
                            if (offset) {
                                // trigger another jump to def based on the offset of the RHS
                                requestJumpToDef(session, offset);
                                madeNewRequest = true;
                            }
                        }
                    }
                }
                // We didn't make a new jump-to-def request, so we can resolve the promise
                // and set the selection
                if (!madeNewRequest) {
                    // set the selection
                    session.editor.setSelection(start, end, true);
                    result.resolve(true);
                }
            }
Sets the selection to move the cursor to the result position.
Assumes that the editor has already changed files, if necessary.

Additionally, this will check to see if the selection looks like an
assignment to a member expression - if it is, and the type is a function,
then we will attempt to jump to the RHS of the expression.

'exports.foo = foo'

if the selection is 'foo' in 'exports.foo', then we will attempt to jump to def
on the rhs of the assignment.

@param {number} start - the start of the selection
@param {number} end - the end of the selection
@param {boolean} isFunction - true if we are jumping to the source of a function def