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package response
func Merge(input []Response) []Response {
if len(input) < 2 {
return input
}
merged := make([]Response, 0, len(input))
for _, resp := range input {
merged = appendOrMergeResponse(merged, resp)
}
return merged
}
// appendOrMergeResponse will find out if `unmerged` can be merged with some
// element of `input`. It starts last thing first (i.e. the newest update).
//
// There are certain response types which cannot be merged together (e.g. recent and
// exist) but one response can ignore (canSkip == true) the other and try to
// merge with older responses (e.g. exists.canSkip(other) return true for
// recent and fetch).
func appendOrMergeResponse(input []Response, unmerged Response) []Response {
mergeable, ok := unmerged.(mergeableResponse)
if !ok {
return append(input, unmerged)
}
wasMerged := false
for i := len(input) - 1; i >= 0; i-- {
merged := mergeable.mergeWith(input[i])
if merged != nil {
wasMerged = true
input[i] = merged
break
}
if !mergeable.canSkip(input[i]) {
break
}
}
if !wasMerged {
input = append(input, unmerged)
}
return input
}
func appendOrMergeItem(input []Item, unmerged Item) []Item {
mergeable, ok := unmerged.(mergeableItem)
if !ok {
return append(input, unmerged)
}
wasMerged := false
for i := range input {
merged := mergeable.mergeWith(input[i])
if merged != nil {
wasMerged = true
input[i] = merged
break
}
}
if !wasMerged {
input = append(input, unmerged)
}
return input
}
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