[JEXL-275] Allow safe navigation as option

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.1
• Fix Version/s: 3.2
• Assignee: Henri Biestro
• Reporter: Henri Biestro
• Created: 17/Sep/18 14:49
• Updated: 07/Jun/21 13:14
• Resolved: 29/Apr/20 10:27

Description

WHAT:
The 'safe navigation' operator (?.) - allowing a null property to stop and return null in a navigation expression - has been introduced. However, in many occasions, being able to let the '.' and '[...]' operators behave 'safely' without reverting to the 'lenient' mode would be very convenient.
Moreover, it seems 3.1 already allow 'safe' / silent navigation when calling methods / functions; fixing this behaviour will break existing scripts. Explicitly introducing this 'safe' behaviour would mitigate the (3.2) migration cost greatly.
HOW:
Builder option to set the flag, inject checking the flag when node.isSafeLhs(...) is used.

Issue Links

• relates to: JEXL-250 Safe navigation operator