moved scanner sources to package 'scan'

operator-fraction.go

@@ -10,27 +10,27 @@ import (
 	"fmt"
 
 	"git.portale-stac.it/go-pkg/expr/kern"
+	"git.portale-stac.it/go-pkg/expr/scan"
 )
 
 // -------- fraction term
-func newFractionTerm(tk *Token) *term {
-	return &term{
-		tk:       *tk,
-		parent:   nil,
-		children: make([]*term, 0, 2),
-		position: posInfix,
-		priority: priFraction,
-		evalFunc: evalFraction,
+func newFractionTerm(tk *scan.Token) *scan.Term {
+	return &scan.Term{
+		Tk:       *tk,
+		Children: make([]*scan.Term, 0, 2),
+		Position: scan.PosInfix,
+		Priority: scan.PriFraction,
+		EvalFunc: evalFraction,
 	}
 }
 
 // -------- eval func
-func evalFraction(ctx kern.ExprContext, opTerm *term) (v any, err error) {
+func evalFraction(ctx kern.ExprContext, opTerm *scan.Term) (v any, err error) {
 	var numValue, denValue any
 	var num, den int64
 	var ok bool
 
-	if numValue, denValue, err = opTerm.evalInfix(ctx); err != nil {
+	if numValue, denValue, err = opTerm.EvalInfix(ctx); err != nil {
 		return
 	}
 	if num, ok = numValue.(int64); !ok {
@@ -42,7 +42,7 @@ func evalFraction(ctx kern.ExprContext, opTerm *term) (v any, err error) {
 		return
 	}
 	if den == 0 {
-		err = opTerm.errDivisionByZero()
+		err = opTerm.Errorf("division by zero")
 		return
 	}
 
@@ -71,5 +71,5 @@ func evalFraction(ctx kern.ExprContext, opTerm *term) (v any, err error) {
 // init
 func init() {
 	// registerTermConstructor(SymVertBar, newFractionTerm)
-	registerTermConstructor(SymColon, newFractionTerm)
+	scan.RegisterTermConstructor(scan.SymColon, newFractionTerm)
 }