mirror of
https://github.com/go-gitea/gitea
synced 2024-12-19 06:44:23 +01:00
61 lines
2.1 KiB
Go
61 lines
2.1 KiB
Go
// Package diff implements line oriented diffs, similar to the ancient
|
|
// Unix diff command.
|
|
//
|
|
// The current implementation is just a wrapper around Sergi's
|
|
// go-diff/diffmatchpatch library, which is a go port of Neil
|
|
// Fraser's google-diff-match-patch code
|
|
package diff
|
|
|
|
import (
|
|
"bytes"
|
|
"time"
|
|
|
|
"github.com/sergi/go-diff/diffmatchpatch"
|
|
)
|
|
|
|
// Do computes the (line oriented) modifications needed to turn the src
|
|
// string into the dst string. The underlying algorithm is Meyers,
|
|
// its complexity is O(N*d) where N is min(lines(src), lines(dst)) and d
|
|
// is the size of the diff.
|
|
func Do(src, dst string) (diffs []diffmatchpatch.Diff) {
|
|
// the default timeout is time.Second which may be too small under heavy load
|
|
return DoWithTimeout(src, dst, time.Hour)
|
|
}
|
|
|
|
// DoWithTimeout computes the (line oriented) modifications needed to turn the src
|
|
// string into the dst string. The `timeout` argument specifies the maximum
|
|
// amount of time it is allowed to spend in this function. If the timeout
|
|
// is exceeded, the parts of the strings which were not considered are turned into
|
|
// a bulk delete+insert and the half-baked suboptimal result is returned at once.
|
|
// The underlying algorithm is Meyers, its complexity is O(N*d) where N is
|
|
// min(lines(src), lines(dst)) and d is the size of the diff.
|
|
func DoWithTimeout (src, dst string, timeout time.Duration) (diffs []diffmatchpatch.Diff) {
|
|
dmp := diffmatchpatch.New()
|
|
dmp.DiffTimeout = timeout
|
|
wSrc, wDst, warray := dmp.DiffLinesToRunes(src, dst)
|
|
diffs = dmp.DiffMainRunes(wSrc, wDst, false)
|
|
diffs = dmp.DiffCharsToLines(diffs, warray)
|
|
return diffs
|
|
}
|
|
|
|
// Dst computes and returns the destination text.
|
|
func Dst(diffs []diffmatchpatch.Diff) string {
|
|
var text bytes.Buffer
|
|
for _, d := range diffs {
|
|
if d.Type != diffmatchpatch.DiffDelete {
|
|
text.WriteString(d.Text)
|
|
}
|
|
}
|
|
return text.String()
|
|
}
|
|
|
|
// Src computes and returns the source text
|
|
func Src(diffs []diffmatchpatch.Diff) string {
|
|
var text bytes.Buffer
|
|
for _, d := range diffs {
|
|
if d.Type != diffmatchpatch.DiffInsert {
|
|
text.WriteString(d.Text)
|
|
}
|
|
}
|
|
return text.String()
|
|
}
|