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Posted to notifications@groovy.apache.org by "mg (JIRA)" <ji...@apache.org> on 2017/08/27 14:44:00 UTC
[jira] [Created] (GROOVY-8301) break/return/continue support in
"Appended Block Closures"
mg created GROOVY-8301:
--------------------------
Summary: break/return/continue support in "Appended Block Closures"
Key: GROOVY-8301
URL: https://issues.apache.org/jira/browse/GROOVY-8301
Project: Groovy
Issue Type: Proposal
Components: Compiler
Reporter: mg
This proposal revisits the idea to change the semantics of the break, return, and continue keyword for closures that are used in a way that mimics Java block constructs such as if, for, or while.
Example 1:
{code}
// Iterate over all PERSON rows in the result set
sqe.forEachRow("select * from PERSON") { final row ->
if(row.TAG == 0) { break } // Leave forEachRow loop
if(row.TAG == 1) { return } // return from the method enclosing the forEachRow loop
if(row.TAG == 2) { continue } // Move to next iteration in the forEachRow loop
}
{code}
Example 2:
{code}
// Encapsulate with statically imported helper method that catches exceptions and ignores them, if the passed parameter is true
execWithOptionalIgnoreErrors(ignoreErrorsQ) {
final x = dangerousOperation()
if(x == 1) { return } // return from the enclosing method
// Note: break & continue are not allowed here
}
{code}
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