[jira] [Updated] (GROOVY-11525) Support expression scope variable

["Daniel Sun (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/GROOVY-11525?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Daniel Sun updated GROOVY-11525:
--------------------------------
    Description: 
Let's take a look at the following code first:
{code}
int hash(Object key) {
   int h;
   return (key == null) ? 0 : (h = key.hashCode()) ^ (h >>> 16);
}
{code}
variable {{h}} is actually an expression scope variable, but current syntax doesn't support.

I propose an expression scope variable syntax, e.g. 
{code}
int hash(Object key) {
   // h is only visible in the expression
   return (int h; (key == null) ? 0 : (h = key.hashCode()) ^ (h >>> 16))
}
{code}

We can reduce the scope of {{h}} further:
{code}
int hash(Object key) {
   // h is only visible in the expression
   return (key == null) ? 0 : (int h; (h = key.hashCode()) ^ (h >>> 16))
}
{code}


  was:
Let's take a look at the following code first:
{code}
int hash(Object key) {
   int h;
   return (key == null) ? 0 : (h = key.hashCode()) ^ (h >>> 16);
}
{code}
variable {{h}} is actually an expression scope variable, but current syntax doesn't support.

I propose an expression scope variable syntax, e.g. 
{code}
int hash(Object key) {
   // h is only visible in the expression
   return (int h; (key == null) ? 0 : (h = key.hashCode()) ^ (h >>> 16))
}
{code}



> Support expression scope variable
> ---------------------------------
>
>                 Key: GROOVY-11525
>                 URL: https://issues.apache.org/jira/browse/GROOVY-11525
>             Project: Groovy
>          Issue Type: New Feature
>            Reporter: Daniel Sun
>            Priority: Major
>
> Let's take a look at the following code first:
> {code}
> int hash(Object key) {
>    int h;
>    return (key == null) ? 0 : (h = key.hashCode()) ^ (h >>> 16);
> }
> {code}
> variable {{h}} is actually an expression scope variable, but current syntax doesn't support.
> I propose an expression scope variable syntax, e.g. 
> {code}
> int hash(Object key) {
>    // h is only visible in the expression
>    return (int h; (key == null) ? 0 : (h = key.hashCode()) ^ (h >>> 16))
> }
> {code}
> We can reduce the scope of {{h}} further:
> {code}
> int hash(Object key) {
>    // h is only visible in the expression
>    return (key == null) ? 0 : (int h; (h = key.hashCode()) ^ (h >>> 16))
> }
> {code}



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