Swift package for diff-match-patch library from Google.
The originating code has not seen updates in years and the Objective-C code must be built with ARC disabled. I created this Swift package to abstract this configuration change outside of my main Xcode project.
Add DiffMatchPatch in Xcode under Project > Package Dependencies.
Then import it as shown below:
import diff_match_patchGet diffs between two Swift strings:
let dmp = DiffMatchPatch()
// optionally set a timeout to stop very long processing
dmp.diff_Timeout = TimeInterval(1.0)
let array = dmp.diff_main(ofOldString: string1, andNewString: string2)
// optionally perform a semantic cleanup of diffs
dmp.diff_cleanupSemantic(array)
// cast NSMutableArray to [Diff]
guard let diffs = array as? [Diff] else {
return
}It contains a small change to - (NSMutableArray *)diff_bisectOfOldString:(NSString *)_text1 andNewString:(NSString *)_text2 deadline:(NSTimeInterval)deadline; that allocates the CFIndex buffer in heap instead of stack. This seems to fix crashes with EXC_BAD_ACCESS when diffing large (over 500kB) strings.
The code carries the same Apache licence as the original code from Google.