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https://issues.apache.org/jira/browse/GROOVY-10090?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Daniel Sun updated GROOVY-10090:
--------------------------------
Description:
We need unify expression and statement by introduing {{BlockExpression}} to
support new features. {{BlockExpression}} creates a new variable scope and
allows {{yield}} to produce the final result, thus statement could be used
where expression appears, e.g.
* GROOVY-9272 could leverage the power of this improvement to treat statement
as expression.
* Pattern matching could be supported easily, e.g. {{v instanceof Map map}}
* {{def v = if (pass) 'Yes' else 'No'}}
*
{code:groovy}
def v = while(cnt < 3) {
if (pass) yield 'Yes' // produce the value for BlockExpression (Note:
default value is null)
cnt++
}
{code}
*Note:* we do not introduce any new syntax for {{BlockExpression}} but just
introduce a new AST node
was:
We need unify expression and statement by introduing {{BlockExpression}} to
support new features. {{BlockExpression}} reuses the existing variable scope
and allows {{yield}} to produce the final result, thus statement could be used
where expression appears, e.g.
* GROOVY-9272 could leverage the power of this improvement to treat statement
as expression.
* Pattern matching could be supported easily, e.g. {{v instanceof Map map}}
* {{def v = if (pass) 'Yes' else 'No'}}
*
{code:groovy}
def v = while(cnt < 3) {
if (pass) yield 'Yes' // produce the value for BlockExpression (Note:
default value is null)
cnt++
}
{code}
*Note:* we do not introduce any new syntax for {{BlockExpression}} but just
introduce a new AST node
> Support `BlockExpression` to treat statement as expression
> ----------------------------------------------------------
>
> Key: GROOVY-10090
> URL: https://issues.apache.org/jira/browse/GROOVY-10090
> Project: Groovy
> Issue Type: Improvement
> Reporter: Daniel Sun
> Priority: Major
>
> We need unify expression and statement by introduing {{BlockExpression}} to
> support new features. {{BlockExpression}} creates a new variable scope and
> allows {{yield}} to produce the final result, thus statement could be used
> where expression appears, e.g.
> * GROOVY-9272 could leverage the power of this improvement to treat
> statement as expression.
> * Pattern matching could be supported easily, e.g. {{v instanceof Map map}}
> * {{def v = if (pass) 'Yes' else 'No'}}
> *
> {code:groovy}
> def v = while(cnt < 3) {
> if (pass) yield 'Yes' // produce the value for BlockExpression (Note:
> default value is null)
> cnt++
> }
> {code}
> *Note:* we do not introduce any new syntax for {{BlockExpression}} but just
> introduce a new AST node
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