[jira] [Comment Edited] (GROOVY-10473) Extend streams support to spread and subscript

["Eric Milles (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/GROOVY-10473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17489094#comment-17489094 ] 

Eric Milles edited comment on GROOVY-10473 at 2/8/22, 8:02 PM:
---------------------------------------------------------------

The spread-dot syntax is supported for dynamic groovy because {{Stream}} provides an "iterator" method and ScriptBytecodeAdapter does this:
{code:java}
    public static Object getPropertySpreadSafe(Class senderClass, Object receiver, String messageName) throws Throwable {
        if (receiver == null) return null;

        List answer = new ArrayList();
        for (Iterator it = InvokerHelper.asIterator(receiver); it.hasNext();) {
            answer.add(getPropertySafe(senderClass, it.next(), messageName));
        }
        return answer;
    }
// or
    public static Object invokeMethodNSpreadSafe(Class senderClass, Object receiver, String messageName, Object[] messageArguments) throws Throwable {
        if (receiver == null) return null;
        List answer = new ArrayList();
        for (Iterator it = InvokerHelper.asIterator(receiver); it.hasNext();) {
            answer.add(invokeMethodNSafe(senderClass, it.next(), messageName, messageArguments));
        }
        return answer;
    }
{code}

For static compilation, see GROOVY-8133


was (Author: emilles):
The spread-dot syntax is supported for dynamic groovy because {{Stream}} provides an "iterator" method and ScriptBytecodeAdapter does this:
{code:java}
    public static Object invokeMethodNSpreadSafe(Class senderClass, Object receiver, String messageName, Object[] messageArguments) throws Throwable {
        if (receiver == null) return null;
        List answer = new ArrayList();
        for (Iterator it = InvokerHelper.asIterator(receiver); it.hasNext();) {
            answer.add(invokeMethodNSafe(senderClass, it.next(), messageName, messageArguments));
        }
        return answer;
    }
{code}

For static compilation, see GROOVY-8133

> Extend streams support to spread and subscript
> ----------------------------------------------
>
>                 Key: GROOVY-10473
>                 URL: https://issues.apache.org/jira/browse/GROOVY-10473
>             Project: Groovy
>          Issue Type: Improvement
>            Reporter: Eric Milles
>            Priority: Major
>
> Groovy 3 and 4 added some {{Stream}} extension methods like {{plus}}, {{toList}} and {{toArray}}.  And some default type conversions like {{String[] array = stream;}}.  This could be taken further by having spread-dot and subscript support:
> {code:groovy}
> stream*.thing // --> stream.map(it -> it.thing).toList()
> stream[1] // --> stream.skip(1).findFirst().orElse(null)
> stream[1..10] // --> stream.skip(1).limit(10-1).toList()
> // consider negative indexes and reverse ranges
> {code}
> Also, {{forEachPair}} and {{zip}} extension methods would be useful for processing corresponding streams.



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