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Posted to notifications@groovy.apache.org by "Chaitanya Birudavolu (JIRA)" <ji...@apache.org> on 2019/01/08 08:40:00 UTC
[jira] [Created] (GROOVY-8952) Eager interpolation evaluating as a
Closure does a lazy invoke of the Closure
Chaitanya Birudavolu created GROOVY-8952:
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Summary: Eager interpolation evaluating as a Closure does a lazy invoke of the Closure
Key: GROOVY-8952
URL: https://issues.apache.org/jira/browse/GROOVY-8952
Project: Groovy
Issue Type: Bug
Affects Versions: 2.5.5
Environment: Windows 10
Reporter: Chaitanya Birudavolu
This is regarding the eager placeholder
{code:java}
${ <expression> }{code}
The expected behavior is that the expression would be evaluated eagerly (at GString creation time). Later, at GString coercion time, the value that is expected in the place of the eager placeholder is the result of
{code:java}
<expression>.toString(){code}
This works most of the time, but doesn't seem to work if the expression evaluates to a Closure type. If the expression evaluates to a Closure type, what is observed is that, in the place of the placeholder, instead of seeing ...
{code:java}
<closure>.toString(){code}
... we see...
{code:java}
<closure-invocation-result>.toString(){code}
For example, in the below code...
{code:java}
def c = {->println ('Inside closure')}
println ('Just before creating the GString')
def gstr = "${println ('Inside eager placeholder'); 20; 30; c}"
println ('Just after creating the GString')
println (gstr)
{code}
...the expected behavior is that the closure should never get executed, and the last println should only print the result of
{code:java}
c.toString(){code}
Instead, the last line printed is observed to be:
{code:java}
Inside closure{code}
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