add not_contains operator

Author: LeandroSNunes

querybuilder/operator/not_contains.go

@@ -0,0 +1,12 @@
+package operator
+
+func init() {
+	AddOperator(NotContains)
+}
+
+var NotContains = &Operator{
+	Name: "not_contains",
+	Evaluate: func(input, value interface{}) bool {
+		return !Contains.Evaluate(input, value)
+	},
+}

querybuilder/operator/not_contains_test.go

@@ -0,0 +1,29 @@
+package operator
+
+import "testing"
+
+func TestNotContains(t *testing.T) {
+	var inputs = []struct {
+		title string
+		value interface{}
+		input interface{}
+		want  bool
+	}{
+		{title: "contains-1", value: "word to", input: "my word to match", want: false},
+		{title: "contains-2", value: "my", input: "my word to match", want: false},
+		{title: "contains-3", value: "myword", input: "my word to match", want: true},
+		{title: "contains-4", value: 2, input: []int{1, 2, 3}, want: false},
+		{title: "contains-5", value: 2.5, input: []float64{2.0, 2.3, 2.5, 3}, want: false},
+		{title: "contains-6", value: "c", input: []string{"a", "b", "c"}, want: false},
+		{title: "contains-7", value: "d", input: []string{"a", "b", "c"}, want: true},
+	}
+
+	for _, input := range inputs {
+		t.Run(input.title, func(t *testing.T) {
+			got := NotContains.Evaluate(input.input, input.value)
+			if got != input.want {
+				t.Errorf("%v not contains %v got: %t, want: %t", input.input, input.value, got, input.want)
+			}
+		})
+	}
+}