github.com/nevalang/neva@v0.23.1-0.20240507185603-7696a9bb8dda/internal/runtime/funcs/println.go (about)

     1  package funcs
     2  
     3  import (
     4  	"context"
     5  	"fmt"
     6  
     7  	"github.com/nevalang/neva/internal/runtime"
     8  )
     9  
    10  type println struct{}
    11  
    12  func (p println) Create(io runtime.FuncIO, _ runtime.Msg) (func(ctx context.Context), error) {
    13  	dataIn, err := io.In.Port("data")
    14  	if err != nil {
    15  		return nil, err
    16  	}
    17  
    18  	sigOut, err := io.Out.Port("sig")
    19  	if err != nil {
    20  		return nil, err
    21  	}
    22  
    23  	return func(ctx context.Context) {
    24  		var data runtime.Msg
    25  
    26  		for {
    27  			select {
    28  			case <-ctx.Done():
    29  				return
    30  			case data = <-dataIn:
    31  			}
    32  
    33  			if _, err := fmt.Println(data); err != nil {
    34  				panic(err)
    35  			}
    36  
    37  			select {
    38  			case <-ctx.Done():
    39  				return
    40  			case sigOut <- data:
    41  			}
    42  		}
    43  	}, nil
    44  }