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tpl: Add uniq function
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4 changed files with 89 additions and 0 deletions
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@ -373,6 +373,15 @@ e.g.
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{{ .Content }}
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{{ end }}
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### uniq
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Takes in a slice or array and returns a slice with subsequent duplicate elements removed.
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{{ uniq (slice 1 2 3 2) }}
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{{ slice 1 2 3 2 | uniq }}
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<!-- both return [1 2 3] -->
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## Files
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### readDir
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@ -587,3 +587,41 @@ func (ns *Namespace) Union(l1, l2 interface{}) (interface{}, error) {
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return nil, errors.New("can't iterate over " + reflect.ValueOf(l1).Type().String())
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}
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}
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// Uniq takes in a slice or array and returns a slice with subsequent
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// duplicate elements removed.
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func (ns *Namespace) Uniq(l interface{}) (interface{}, error) {
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if l == nil {
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return make([]interface{}, 0), nil
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}
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lv := reflect.ValueOf(l)
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lv, isNil := indirect(lv)
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if isNil {
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return nil, errors.New("invalid nil argument to Uniq")
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}
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var ret reflect.Value
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switch lv.Kind() {
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case reflect.Slice:
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ret = reflect.MakeSlice(lv.Type(), 0, 0)
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case reflect.Array:
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ret = reflect.MakeSlice(reflect.SliceOf(lv.Type().Elem()), 0, 0)
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default:
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return nil, errors.New("Can't use Uniq on " + reflect.ValueOf(lv).Type().String())
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}
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for i := 0; i != lv.Len(); i++ {
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lvv := lv.Index(i)
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lvv, isNil := indirect(lvv)
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if isNil {
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continue
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}
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if !ns.In(ret.Interface(), lvv.Interface()) {
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ret = reflect.Append(ret, lvv)
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}
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}
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return ret.Interface(), nil
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}
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@ -603,6 +603,42 @@ func TestUnion(t *testing.T) {
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}
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}
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func TestUniq(t *testing.T) {
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t.Parallel()
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ns := New(&deps.Deps{})
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for i, test := range []struct {
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l interface{}
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expect interface{}
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isErr bool
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}{
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{[]string{"a", "b", "c"}, []string{"a", "b", "c"}, false},
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{[]string{"a", "b", "c", "c"}, []string{"a", "b", "c"}, false},
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{[]string{"a", "b", "b", "c"}, []string{"a", "b", "c"}, false},
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{[]string{"a", "b", "c", "b"}, []string{"a", "b", "c"}, false},
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{[]int{1, 2, 3}, []int{1, 2, 3}, false},
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{[]int{1, 2, 3, 3}, []int{1, 2, 3}, false},
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{[]int{1, 2, 2, 3}, []int{1, 2, 3}, false},
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{[]int{1, 2, 3, 2}, []int{1, 2, 3}, false},
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{[4]int{1, 2, 3, 2}, []int{1, 2, 3}, false},
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{nil, make([]interface{}, 0), false},
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// should-errors
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{1, 1, true},
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{"foo", "fo", true},
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} {
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errMsg := fmt.Sprintf("[%d] %v", i, test)
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result, err := ns.Uniq(test.l)
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if test.isErr {
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assert.Error(t, err, errMsg)
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continue
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}
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assert.NoError(t, err, errMsg)
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assert.Equal(t, test.expect, result, errMsg)
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}
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}
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func (x *TstX) TstRp() string {
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return "r" + x.A
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}
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@ -137,6 +137,12 @@ func init() {
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{`{{ seq 3 }}`, `[1 2 3]`},
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},
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)
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ns.AddMethodMapping(ctx.Uniq,
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[]string{"uniq"},
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[][2]string{
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{`{{ slice 1 2 3 2 | uniq }}`, `[1 2 3]`},
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},
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)
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return ns
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