added operator './' (float division) and test

operator-prod.go

@@ -91,8 +91,43 @@ func evalDivide(ctx exprContext, self *term) (v any, err error) {
 	return
 }
 
+//-------- divide as float term
+
+func newDivideAsFloatTerm(tk *Token) (inst *term) {
+	return &term{
+		tk:       *tk,
+		class:    classOperator,
+		kind:     kindUnknown,
+		children: make([]*term, 0, 2),
+		position: posInfix,
+		priority: priProduct,
+		evalFunc: evalDivideAsFloat,
+	}
+}
+
+func evalDivideAsFloat(ctx exprContext, self *term) (v any, err error) {
+	var leftValue, rightValue any
+
+	if leftValue, rightValue, err = self.evalInfix(ctx); err != nil {
+		return
+	}
+
+	if isNumber(leftValue) && isNumber(rightValue) {
+		d := numAsFloat(rightValue)
+		if d == 0.0 {
+			err = errors.New("division by zero")
+		} else {
+			v = numAsFloat(leftValue) / d
+		}
+	} else {
+		err = self.errIncompatibleTypes(leftValue, rightValue)
+	}
+	return
+}
+
 // init
 func init() {
 	registerTermConstructor(SymStar, newMultiplyTerm)
 	registerTermConstructor(SymSlash, newDivideTerm)
+	registerTermConstructor(SymDotSlash, newDivideAsFloatTerm)
 }