[METRON-1877] Nested IF ELSE statements can cause parse errors in Stellar

• Type: Improvement
• Status: Done
• Priority: Major
• Resolution: Done
• Fix Version/s: 0.7.0
• Assignee: Justin Leet
• Reporter: Justin Leet
• Created: 16/Nov/18 16:26
• Updated: 11/Dec/18 15:59
• Resolved: 11/Dec/18 15:52

Description

IF ELSE statements nested inside IF ELSEstatements can cause problems with short-circuiting. See the following example.

Stellar>>> IF true THEN IF false THEN true ELSE false ELSE is_alert
false
Stellar>>> IF true THEN IF true THEN true ELSE false ELSE is_alert
! Invalid parse, found null
org.apache.metron.stellar.dsl.ParseException: Invalid parse, found null
at org.apache.metron.stellar.common.StellarCompiler$Expression.apply(StellarCompiler.java:211)
at org.apache.metron.stellar.common.BaseStellarProcessor.parse(BaseStellarProcessor.java:145)
at org.apache.metron.stellar.common.shell.DefaultStellarShellExecutor.executeStellar(DefaultStellarShellExecutor.java:401)
at org.apache.metron.stellar.common.shell.DefaultStellarShellExecutor.execute(DefaultStellarShellExecutor.java:257)
at org.apache.metron.stellar.common.shell.cli.StellarShell.execute(StellarShell.java:357)
at org.jboss.aesh.console.AeshProcess.run(AeshProcess.java:53)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:748)

Issue Links

• links to: GitHub Pull Request #1268