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add option to use brackets for array indexes #18

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add option to use brackets for array indexes #18

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14 changes: 10 additions & 4 deletions flatten.go
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,8 @@ type SeparatorStyle struct {
Before string // Prepend to key
Middle string // Add between keys
After string // Append to key

UseBracketsForArrayIndex bool
}

// Default styles
Expand Down Expand Up @@ -102,12 +104,12 @@ func flatten(top bool, flatMap map[string]interface{}, nested interface{}, prefi
switch nested.(type) {
case map[string]interface{}:
for k, v := range nested.(map[string]interface{}) {
newKey := enkey(top, prefix, k, style)
newKey := enkey(top, false, prefix, k, style)
assign(newKey, v)
}
case []interface{}:
for i, v := range nested.([]interface{}) {
newKey := enkey(top, prefix, strconv.Itoa(i), style)
newKey := enkey(top, true, prefix, strconv.Itoa(i), style)
assign(newKey, v)
}
default:
Expand All @@ -117,13 +119,17 @@ func flatten(top bool, flatMap map[string]interface{}, nested interface{}, prefi
return nil
}

func enkey(top bool, prefix, subkey string, style SeparatorStyle) string {
func enkey(top, arrayIndex bool, prefix, subkey string, style SeparatorStyle) string {
key := prefix

if top {
key += subkey
} else {
key += style.Before + style.Middle + subkey + style.After
if arrayIndex && style.UseBracketsForArrayIndex {
key += "[" + subkey + "]"
} else {
key += style.Before + style.Middle + subkey + style.After
}
}

return key
Expand Down
22 changes: 22 additions & 0 deletions flatten_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -334,6 +334,28 @@ func TestFlattenString(t *testing.T) {
DotStyle,
nil,
},
// 14 -- json path style
{
`{ "a": { "b" : { "array" : [ "d" , "e" ] } }, "number": 1.4567,"bool": true }`,
`{ "flag-a.b.array[0]":"d","flag-a.b.array[1]": "e","flag-bool": true,"flag-number": 1.4567 }`,
"flag-",
SeparatorStyle{
Middle: ".",
UseBracketsForArrayIndex: true,
},
nil,
},
// 14 -- json path style with array of objects
{
`{ "a": { "b" : { "array" : [ { "d" : "e" } ] } }, "number": 1.4567,"bool": true }`,
`{ "flag-a.b.array[0].d": "e","flag-bool": true,"flag-number": 1.4567 }`,
"flag-",
SeparatorStyle{
Middle: ".",
UseBracketsForArrayIndex: true,
},
nil,
},
}

for i, test := range cases {
Expand Down