this library can traverse and do simple mapping of 1 json (map[string]interface{}) to another json. For now it can't deals with aggregating json array into single json.
Example for simple traversing
input := "$.name.first"
source := strings.NewReader(input)
parser := jsontoloyo.NewParser(source)
selectors := []*jsontoloyo.Selector{}
sourceMap := map[string]interface{}{}
sourceMap["name"] = map[string]interface{}{"first": "LL", "last": "XX"}
err := parser.Parse(&selectors)
if err != nil {
os.Exit(-1)
}
fmt.Println(selectors)
if len(selectors) != 3 {
os.Exit(-1)
}
traverser := jsontoloyo.NewTraverser(sourceMap, selectors)
kk, err := traverser.Traverse()
if err != nil {
os.Exit(-1)
}
fmt.Println(kk) // this should output LL
Get specific index of array
input := "$.ii[1]"
source := strings.NewReader(input)
parser := jsontoloyo.NewParser(source)
selectors := []*jsontoloyo.Selector{}
sourceMap := map[string]interface{}{}
sourceMap["ii"] = []int{0, 1, 2, 3, 4}
err := parser.Parse(&selectors)
if err != nil {
fmt.Println(err.Error())
os.Exit(-1)
}
traverser := jsontoloyo.NewTraverser(sourceMap, selectors)
kk, err := traverser.Traverse()
if err != nil {
fmt.Println(err.Error())
os.Exit(-1)
}
fmt.Println(kk)// kk should be 1
get aggregate of an array
input := "$.$sum($.ii)"
source := strings.NewReader(input)
parser := jsontoloyo.NewParser(source)
selectors := []*jsontoloyo.Selector{}
sourceMap := map[string]interface{}{}
sourceMap["ii"] = []int{0, 1, 2, 3, 4}
err := parser.Parse(&selectors)
if err != nil {
fmt.Println(err.Error())
os.Exit(-1)
}
if len(selectors) != 2 {
t.Fail()
}
traverser := jsontoloyo.NewTraverser(sourceMap, selectors)
kk, err := traverser.Traverse()
if err != nil {
t.Log(err.Error())
t.Fail()
}
fmt.Println(kk)//kk should be 10
basic mapping json to json
source := map[string]interface{}{
"scores": []int{10, 10, 40},
}
sink := map[string]interface{}{}
mappings := jsontoloyo.NewMappers()
mappings.AddMapping("avg_score", "$.$avg($.scores)")
err := mappings.Mapping(source, sink)
if err != nil {
t.Log("err", err.Error())
t.Fail()
}
if _, ok := sink["avg_score"]; !ok {
t.Log("No new field")
t.FailNow()
}
if sink["avg_score"] != 20.0 {
t.Log("avg", sink["avg_score"])
t.Fail()
}
Basic mapping from json array to json array
source := []map[string]interface{}{
map[string]interface{}{
"scores": []int{10, 10, 40},
},
map[string]interface{}{
"scores": []int{10, 20},
},
}
sink := []map[string]interface{}{}
mappings := jsontoloyo.NewMappers()
mappings.AddMapping("avg_score", "$.$avg($.scores)")
err := mappings.MappingArray(&source, &sink)
if err != nil {
t.Log("err", err.Error())
t.Fail()
}
if len(sink) != 2 {
t.FailNow()
}
if sink[0]["avg_score"] != 20.00 {
t.Fail()
}
if sink[1]["avg_score"] != 15.00 {
t.Fail()
}