moved scanner sources to package 'scan'

operator-filter.go

@@ -9,30 +9,31 @@ import (
 	"io"
 
 	"git.portale-stac.it/go-pkg/expr/kern"
+	"git.portale-stac.it/go-pkg/expr/scan"
 )
 
 //-------- map term
 
-func newFilterTerm(tk *Token) (inst *term) {
-	return &term{
-		tk:       *tk,
-		children: make([]*term, 0, 2),
-		position: posInfix,
-		priority: priIterOp,
-		evalFunc: evalFilter,
+func newFilterTerm(tk *scan.Token) (inst *scan.Term) {
+	return &scan.Term{
+		Tk:       *tk,
+		Children: make([]*scan.Term, 0, 2),
+		Position: scan.PosInfix,
+		Priority: scan.PriIterOp,
+		EvalFunc: evalFilter,
 	}
 }
 
-func evalFilter(ctx kern.ExprContext, opTerm *term) (v any, err error) {
+func evalFilter(ctx kern.ExprContext, opTerm *scan.Term) (v any, err error) {
 	var leftValue, rightValue any
 	var it kern.Iterator
 	var item any
 
-	if err = opTerm.checkOperands(); err != nil {
+	if err = opTerm.CheckOperands(); err != nil {
 		return
 	}
 
-	if leftValue, err = opTerm.children[0].Compute(ctx); err != nil {
+	if leftValue, err = opTerm.Children[0].Compute(ctx); err != nil {
 		return
 	}
 
@@ -45,7 +46,7 @@ func evalFilter(ctx kern.ExprContext, opTerm *term) (v any, err error) {
 		ctx.SetVar("_", item)
 		ctx.SetVar("__", it.Index())
 		ctx.SetVar("_#", it.Count())
-		if rightValue, err = opTerm.children[1].Compute(ctx); err == nil {
+		if rightValue, err = opTerm.Children[1].Compute(ctx); err == nil {
 			if success, valid := kern.ToBool(rightValue); valid {
 				if success {
 					values.AppendItem(item)
@@ -70,5 +71,5 @@ func evalFilter(ctx kern.ExprContext, opTerm *term) (v any, err error) {
 
 // init
 func init() {
-	registerTermConstructor(SymKwFilter, newFilterTerm)
+	scan.RegisterTermConstructor(scan.SymKwFilter, newFilterTerm)
 }