DeepDiff too slow when comparing 2 string arrays.

[Gocy015]

Hi,
i am trying to implement a text-base diff viewer, my code looks like the following:

let originalLines = originalSource.split(separator: "\n", omittingEmptySubsequences: false).map{String($0)}


let diffLines = diffSource.split(separator: "\n", omittingEmptySubsequences: false).map{String($0)}
            
            
let algorithmStart = CACurrentMediaTime()
let diffchecker = WagnerFischer<String>(reduceMove: false)
let changes = diffchecker.diff(old: originalLines, new: diffLines)
DC_LOG_INFO("DiffVC, diff algorithm cost \(CACurrentMediaTime() - algorithmStart)")

my sample files are 2 objc source files with 650+lines, and only 1 line is different , and the log prints out:
DiffVC, diff algorithm cost 6.890240641998389

Any idea of why this is so slow?

[Gocy015]

I've notice that if i change the code to

let changes =diff(old: originalLines, new: diffLines)

it becomes much faster, diff uses Heckel to diff the arrays, but i want to eliminate Move, how can i achieve that using Heckel ?

btw, it seems that Heckel uses delete + insert instead of replace, which is another feature that i want..

[onmyway133]

@Gocy015 Hi, we need to tweak the algorithm code a bit to achieve what you want, but the design of the library is to have move changes. Hope you understand.

[Gocy015]

ok, thx!