fix: nil pointer

Signed-off-by: Eray Ates <eates23@gmail.com>

README.md

@@ -2,7 +2,7 @@
 
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call.go

@@ -55,16 +55,24 @@ func (r *Reg) CallWithArgs(name string, args ...string) ([]any, error) {
 	if f.Fn.Type().IsVariadic() {
 		fnArgType := f.Fn.Type().In(f.Fn.Type().NumIn() - 1).Elem()
 		for i := f.Fn.Type().NumIn() - 1; i < len(fnArgs); i++ {
-			argType := fnArgs[i].Type()
-			if !argType.AssignableTo(fnArgType) {
-				return nil, fmt.Errorf("variadic function: index %d argument %s type mismatch with function %s type", i, argType, fnArgType)
+			if fnArgs[i].IsValid() {
+				argType := fnArgs[i].Type()
+				if !argType.AssignableTo(fnArgType) {
+					return nil, fmt.Errorf("variadic function: index %d argument %s type mismatch with function %s type", i, argType, fnArgType)
+				}
+			} else {
+				fnArgs[i] = reflect.Zero(fnArgType)
 			}
 		}
 	} else if f.Fn.Type().NumIn() > 0 {
 		fnArgType := f.Fn.Type().In(f.Fn.Type().NumIn() - 1)
-		argType := fnArgs[len(fnArgs)-1].Type()
-		if !argType.AssignableTo(fnArgType) {
-			return nil, fmt.Errorf("function: index %d argument %s type mismatch with function %s type", len(fnArgs)-1, argType, fnArgType)
+		if fnArgs[len(fnArgs)-1].IsValid() {
+			argType := fnArgs[len(fnArgs)-1].Type()
+			if !argType.AssignableTo(fnArgType) {
+				return nil, fmt.Errorf("function: index %d argument %s type mismatch with function %s type", len(fnArgs)-1, argType, fnArgType)
+			}
+		} else {
+			fnArgs[len(fnArgs)-1] = reflect.Zero(fnArgType)
 		}
 	}
 

call_test.go

@@ -111,6 +111,48 @@ func TestReg_CallWithArgs(t *testing.T) {
 			wantErr:    true,
 			wantErrStr: "function: index 2 argument int type mismatch with function string type",
 		},
+		{
+			name: "argument nil",
+			modify: func(r *Reg) {
+				r.AddFunction("test", func(v string, _ interface{}) string { return v })
+				r.AddArgument("test-1", "test-1").AddArgument("test-2", nil)
+			},
+			args: args{
+				name: "test",
+				args: []string{"test-1", "test-2"},
+			},
+			want: []any{
+				"test-1",
+			},
+		},
+		{
+			name: "variadic functions nil",
+			modify: func(r *Reg) {
+				r.AddFunction("test", func(v string, _ ...interface{}) string { return v })
+				r.AddArgument("test-1", "test-1").AddArgument("test-2", nil)
+			},
+			args: args{
+				name: "test",
+				args: []string{"test-1", "test-2"},
+			},
+			want: []any{
+				"test-1",
+			},
+		},
+		{
+			name: "variadic functions nil without value",
+			modify: func(r *Reg) {
+				r.AddFunction("test", func(v string, _ ...interface{}) string { return v })
+				r.AddArgument("test-1", "test-1")
+			},
+			args: args{
+				name: "test",
+				args: []string{"test-1"},
+			},
+			want: []any{
+				"test-1",
+			},
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {