[GROOVY-10212] Provide a mechanism for users to enable Antlr4's SLL (fast but only simple) mode

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 4.0.0-beta-1, 3.0.9
• Assignee: Daniel Sun
• Reporter: Paul King
• Created: 02/Sep/21 12:16
• Updated: 03/Feb/22 22:34
• Resolved: 06/Sep/21 06:23

Description

The Antlr4 framework provides both an SLL (simple) and LL (powerful) mode. To support all Groovy syntax LL is needed. However, for users needing a subset of Groovy, e.g. perhaps a DSL scenario, SLL could be sufficient and may be significantly faster. This issue is about allowing users to enable trying the fast mode (with a fallback to the normal mode). It will be disabled by default. This feature is initially incubating.