moved scanner sources to package 'scan'

operator-unset.go

@@ -8,21 +8,22 @@ import (
 	"strings"
 
 	"git.portale-stac.it/go-pkg/expr/kern"
+	"git.portale-stac.it/go-pkg/expr/scan"
 )
 
 //-------- unset term
 
-func newUnsetTerm(tk *Token) (inst *term) {
-	return &term{
-		tk:       *tk,
-		children: make([]*term, 0, 1),
-		position: posPrefix,
-		priority: priSign,
-		evalFunc: evalUnset,
+func newUnsetTerm(tk *scan.Token) (inst *scan.Term) {
+	return &scan.Term{
+		Tk:       *tk,
+		Children: make([]*scan.Term, 0, 1),
+		Position: scan.PosPrefix,
+		Priority: scan.PriSign,
+		EvalFunc: evalUnset,
 	}
 }
 
-func deleteContextItem(ctx kern.ExprContext, opTerm *term, item any) (deleted bool, err error) {
+func deleteContextItem(ctx kern.ExprContext, opTerm *scan.Term, item any) (deleted bool, err error) {
 	if name, ok := item.(string); ok {
 		var size int
 		if strings.HasSuffix(name, "()") {
@@ -35,16 +36,16 @@ func deleteContextItem(ctx kern.ExprContext, opTerm *term, item any) (deleted bo
 			deleted = ctx.VarCount() < size
 		}
 	} else {
-		err = opTerm.errIncompatiblePrefixPostfixType(item)
+		err = opTerm.ErrIncompatiblePrefixPostfixType(item)
 	}
 	return
 }
 
-func evalUnset(ctx kern.ExprContext, opTerm *term) (v any, err error) {
+func evalUnset(ctx kern.ExprContext, opTerm *scan.Term) (v any, err error) {
 	var childValue any
 	var deleted bool
 
-	if childValue, err = opTerm.evalPrefix(ctx); err != nil {
+	if childValue, err = opTerm.EvalPrefix(ctx); err != nil {
 		return
 	}
 
@@ -69,5 +70,5 @@ func evalUnset(ctx kern.ExprContext, opTerm *term) (v any, err error) {
 
 // init
 func init() {
-	registerTermConstructor(SymKwUnset, newUnsetTerm)
+	scan.RegisterTermConstructor(scan.SymKwUnset, newUnsetTerm)
 }