moved a subset of source file to the kern package

builtin-os-file-iter.go

@@ -8,6 +8,8 @@ import (
 	"fmt"
 	"io"
 	"slices"
+
+	"git.portale-stac.it/go-pkg/expr/kern"
 )
 
 const paramHandleOrPath = "handle-or-path"
@@ -74,7 +76,7 @@ func (it *fileReadTextIterator) Reset() (err error) {
 }
 
 func (it *fileReadTextIterator) HasOperation(name string) bool {
-	return slices.Contains([]string{NextName, ResetName, IndexName, CountName, CurrentName, CleanName}, name)
+	return slices.Contains([]string{kern.NextName, kern.ResetName, kern.IndexName, kern.CountName, kern.CurrentName, kern.CleanName}, name)
 }
 
 func (it *fileReadTextIterator) Clean() (err error) {
@@ -88,25 +90,25 @@ func (it *fileReadTextIterator) Clean() (err error) {
 
 func (it *fileReadTextIterator) CallOperation(name string, args map[string]any) (v any, err error) {
 	switch name {
-	case NextName:
+	case kern.NextName:
 		v, err = it.Next()
-	case ResetName:
+	case kern.ResetName:
 		err = it.Reset()
-	case CleanName:
+	case kern.CleanName:
 		err = it.Clean()
-	case IndexName:
+	case kern.IndexName:
 		v = int64(it.Index())
-	case CurrentName:
+	case kern.CurrentName:
 		v, err = it.Current()
-	case CountName:
+	case kern.CountName:
 		v = it.count
 	default:
-		err = errNoOperation(name)
+		err = kern.ErrNoOperation(name)
 	}
 	return
 }
 
-func fileReadIteratorFunc(ctx ExprContext, name string, args map[string]any) (result any, err error) {
+func fileReadIteratorFunc(ctx kern.ExprContext, name string, args map[string]any) (result any, err error) {
 	var handle *osReader
 	var invalidFileHandle any
 	var ok, autoClose bool
@@ -115,7 +117,7 @@ func fileReadIteratorFunc(ctx ExprContext, name string, args map[string]any) (re
 	if handle, ok = args[paramHandleOrPath].(*osReader); !ok {
 		if fileName, ok := args[paramHandleOrPath].(string); ok && len(fileName) > 0 {
 			var handleAny any
-			if handleAny, err = openFileFunc(ctx, name, map[string]any{ParamFilepath: fileName}); err != nil {
+			if handleAny, err = openFileFunc(ctx, name, map[string]any{kern.ParamFilepath: fileName}); err != nil {
 				return
 			}
 			if handleAny != nil {