'join' operator renamed as 'cat'

operator-cat.go

@@ -1,7 +1,7 @@
 // Copyright (c) 2024-2026 Celestino Amoroso (celestino.amoroso@gmail.com).
 // All rights reserved.
 
-// operator-join.go
+// operator-cat.go
 package expr
 
 import (
@@ -12,19 +12,19 @@ import (
 	"git.portale-stac.it/go-pkg/expr/scan"
 )
 
-//-------- join term
+//-------- cat term
 
-func newJoinTerm(tk *scan.Token) (inst *scan.Term) {
+func newCatTerm(tk *scan.Token) (inst *scan.Term) {
 	return &scan.Term{
 		Tk:       *tk,
 		Children: make([]*scan.Term, 0, 2),
 		Position: scan.PosInfix,
 		Priority: scan.PriIterOp,
-		EvalFunc: evalJoin,
+		EvalFunc: evalCat,
 	}
 }
 
-func evalJoin(ctx kern.ExprContext, opTerm *scan.Term) (v any, err error) {
+func evalCat(ctx kern.ExprContext, opTerm *scan.Term) (v any, err error) {
 	var leftValue, rightValue any
 	var itLeft, itRight kern.Iterator
 	var item any
@@ -69,5 +69,5 @@ func evalJoin(ctx kern.ExprContext, opTerm *scan.Term) (v any, err error) {
 
 // init
 func init() {
-	scan.RegisterTermConstructor(scan.SymKwJoin, newJoinTerm)
+	scan.RegisterTermConstructor(scan.SymKwCat, newCatTerm)
 }

scan/symbol.go

@@ -122,6 +122,7 @@ const (
 	SymKwMap
 	SymKwFilter
 	SymKwDigest
+	SymKwCat
 	SymKwGroupBy
 	SymKwJoin
 	SymKwNil
@@ -141,6 +142,7 @@ func init() {
 		"IN":      SymKwIn,
 		"INCLUDE": SymKwInclude,
 		"MAP":     SymKwMap,
+		"CAT":     SymKwCat,
 		"FILTER":  SymKwFilter,
 		"NOT":     SymKwNot,
 		"OR":      SymKwOr,

t_operator_test.go

@@ -75,11 +75,11 @@ func TestOperatorDigest(t *testing.T) {
 	runTestSuite(t, section, inputs)
 }
 
-func TestOperatorJoin(t *testing.T) {
-	section := "Operator-Join"
+func TestOperatorCat(t *testing.T) {
+	section := "Operator-Cat"
 	inputs := []inputType{
-		/*   1 */ {`["a","b"] join ["x"]`, kern.NewList([]any{"a", "b", "x"}), nil},
-		/*   2 */ {`["a","b"] join ["x"-true]`, nil, `[1:21] left operand 'x' [string] and right operand 'true' [bool] are not compatible with operator "-"`},
+		/*   1 */ {`["a","b"] cat ["x"]`, kern.NewList([]any{"a", "b", "x"}), nil},
+		/*   2 */ {`["a","b"] cat ["x"-true]`, nil, `[1:20] left operand 'x' [string] and right operand 'true' [bool] are not compatible with operator "-"`},
 	}
 
 	// runTestSuiteSpec(t, section, inputs, 2)