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pkg/common/cartesian.go
54 строки
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Ed
Fix Cartesian product to return empty set if empty set is given (#503)
24 янв 2021, 01:55
Не верифицирован
24 янв 2021, 01:55
56ec367
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package common // CartesianProduct takes map of lists and returns list of unique tuples func CartesianProduct(mapOfLists map[string][]interface{}) []map[string]interface{} { listNames := make([]string, 0) lists := make([][]interface{}, 0) for k, v := range mapOfLists { listNames = append(listNames, k) lists = append(lists, v) } listCart := cartN(lists...) rtn := make([]map[string]interface{}, 0) for _, list := range listCart { vMap := make(map[string]interface{}) for i, v := range list { vMap[listNames[i]] = v } rtn = append(rtn, vMap) } return rtn } func cartN(a ...[]interface{}) [][]interface{} { c := 1 for _, a := range a { c *= len(a) } if c == 0 || len(a) == 0 { return nil } p := make([][]interface{}, c) b := make([]interface{}, c*len(a)) n := make([]int, len(a)) s := 0 for i := range p { e := s + len(a) pi := b[s:e] p[i] = pi s = e for j, n := range n { pi[j] = a[j][n] } for j := len(n) - 1; j >= 0; j-- { n[j]++ if n[j] < len(a[j]) { break } n[j] = 0 } } return p }