1 files changed, 60 insertions, 0 deletions
diff --git a/src/mongo/gotools/common/util/slice.go b/src/mongo/gotools/common/util/slice.go
new file mode 100644
index 00000000000..7c98c00ce44
--- /dev/null
+++ b/src/mongo/gotools/common/util/slice.go
@@ -0,0 +1,60 @@
+package util
+
+import (
+	"fmt"
+	"reflect"
+)
+
+// generic function that returns true if elt is in slice.
+// panics if slice is not of Kind reflect.Slice
+func SliceContains(slice, elt interface{}) bool {
+	if slice == nil {
+		return false
+	}
+	v := reflect.ValueOf(slice)
+	if v.Kind() != reflect.Slice {
+		panic(fmt.Sprintf("Cannot call SliceContains on a non-slice %#v of "+
+			"kind %#v", slice, v.Kind().String()))
+	}
+	for i := 0; i < v.Len(); i++ {
+		if reflect.DeepEqual(v.Index(i).Interface(), elt) {
+			return true
+		}
+	}
+	return false
+}
+
+// StringSliceContains reports whether str is in the slice.
+func StringSliceContains(slice []string, str string) bool {
+	return StringSliceIndex(slice, str) != -1
+}
+
+// StringSliceContains returns the first index at which the given element
+// can be found in the slice, or -1 if it is not present.
+func StringSliceIndex(slice []string, str string) int {
+	i := -1
+	for j, v := range slice {
+		if v == str {
+			i = j
+			break
+		}
+	}
+	return i
+}
+
+// generic function that returns number of instances of 'elt' in 'slice'.
+// panics if slice is not of Kind reflect.Slice
+func SliceCount(slice, elt interface{}) int {
+	v := reflect.ValueOf(slice)
+	if v.Kind() != reflect.Slice {
+		panic(fmt.Sprintf("Cannot call SliceCount on a non-slice %#v of kind "+
+			"%#v", slice, v.Kind().String()))
+	}
+	counter := 0
+	for i := 0; i < v.Len(); i++ {
+		if reflect.DeepEqual(v.Index(i).Interface(), elt) {
+			counter++
+		}
+	}
+	return counter
+}