[GROOVY-10755] Ternary returning a list gets parsed improperly

• Type: Bug
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 4.0.4
• Component/s: parser, parser-antlr4

Language

groovy

• Assignee: Unassigned
• Reporter: OC
• Created: 08/Sep/22 16:07
• Updated: 02/Nov/24 22:22

Description

Another problem with ternary operator, this time almost surely a clash with the safe index operator:

2034 ocs /tmp> >q.groovy 
1>2?[1]:0
2035 ocs /tmp> /usr/local/groovy-4.0.4/bin/groovy q   
org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
/private/tmp/q.groovy: 1: Unexpected input: ':' @ line 1, column 8.
   1>2?[1]:0
          ^
1 error
2036 ocs /tmp> 

Most probably affects 4 from the beginning. Used to work properly in previous versions (including Groovy 3 which supported the safe index operator all right).

The issue can be fixed easily e.g. inserting a space betwixt ? and [, thus the minor priority. Nevertheless it is somewhat inconvenient since the operation is pretty common and frequently occurs in the current codebase, which worked under 3 all right. Also, it is sort of difficult to solve it (semi-)automatically, for it is not entirely trivial to distinguish real safe indices from ternaries automatically without a full-fledged parser

Issue Links

• is related to: GROOVY-9561 Some ternary expressions with []'s and 'as' are not parsed properly
• is related to: GROOVY-10003 Eliminate some ambiguities while parsing
• relates to: GROOVY-11509 Ternary Operator Spacing Issue