| 1 | export default function flatten(obj) {
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| 2 | var flattened = {}
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| 3 |
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| 4 | var circlular = []
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| 5 | var circLoc = []
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| 6 |
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| 7 | function _route(prefix, value) {
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| 8 | var i, len, type, keys, circularCheck, loc
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| 9 |
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| 10 | if (value == null) {
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| 11 | if (prefix === "") {
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| 12 | return
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| 13 | }
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| 14 | flattened[prefix] = null
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| 15 | return
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| 16 | }
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| 17 | type = typeof value
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| 18 | if (typeof value == "object") {
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| 19 | circularCheck = circlular.indexOf(value)
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| 20 | if (circularCheck >= 0) {
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| 21 | loc = circLoc[circularCheck] || "this"
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| 22 | flattened[prefix] = "[Circular (" + loc + ")]"
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| 23 | return
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| 24 | }
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| 25 | circlular.push(value)
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| 26 | circLoc.push(prefix)
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| 27 |
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| 28 | if (Array.isArray(value)) {
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| 29 | len = value.length
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| 30 | if (len == 0) _route(prefix + "[]", null)
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| 31 | for (i = 0; i < len; i++) {
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| 32 | _route(prefix + "[" + i + "]", value[i])
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| 33 | }
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| 34 | return
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| 35 | }
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| 36 | keys = Object.keys(value)
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| 37 | len = keys.length
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| 38 | if (prefix) prefix = prefix + "."
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| 39 | if (len == 0) _route(prefix, null)
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| 40 | for (i = 0; i < len; i++) {
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| 41 | _route(prefix + keys[i], value[keys[i]])
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| 42 | }
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| 43 | return
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| 44 | }
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| 45 | flattened[prefix] = value
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| 46 | }
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| 47 |
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| 48 | _route("", obj)
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| 49 |
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| 50 | return flattened
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| 51 | }
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