diff options
Diffstat (limited to 'slice')
-rw-r--r-- | slice/slice.go | 91 | ||||
-rw-r--r-- | slice/slice_test.go | 67 |
2 files changed, 0 insertions, 158 deletions
diff --git a/slice/slice.go b/slice/slice.go deleted file mode 100644 index e5b959e..0000000 --- a/slice/slice.go +++ /dev/null @@ -1,91 +0,0 @@ -package slice - -import ( - "fmt" - "reflect" -) - -type Slice []interface{} - -type Del int - -type Ins struct { - Idx int - Value []interface{} -} - -type insData struct { - idx int - count int -} - -type Delta struct { - Del []Del - Ins []Ins -} - -func (d Delta) String() string { - data := make([]insData, len(d.Ins)) - for i, ins := range d.Ins { - data[i] = insData{ins.Idx, len(ins.Value)} - } - return fmt.Sprintf("{Del: %d Ins: %+v}", d.Del, data) -} - -func Patch(source Slice, delta Delta) (target Slice) { - // apply Del part from patch to source into temp - size := len(source) - len(delta.Del) - temp := make(Slice, size) - fill := 0 - prev := 0 - for _, del := range delta.Del { - di := int(del) - copy(temp[fill:], source[prev:di]) - fill += di - prev - prev = di + 1 - } - copy(temp[fill:], source[prev:]) - // apply Ins part from patch to temp into target - for _, ins := range delta.Ins { - size += len(ins.Value) - } - target = make(Slice, size) - fill = 0 - prev = 0 - tpos := 0 - for _, ins := range delta.Ins { - offset := ins.Idx - prev - copy(target[fill:], temp[tpos:tpos+offset]) - fill += offset - tpos += offset - copy(target[fill:], ins.Value) - fill += len(ins.Value) - prev = ins.Idx + len(ins.Value) - } - copy(target[fill:], temp[tpos:]) - return -} - -func Diff(source Slice, target Slice) (delta Delta) { - var si, ti int - var found bool - for ; si < len(source); si++ { - for i := ti; i < len(target); i++ { - found = reflect.DeepEqual(target[i], source[si]) - if found { - if i != ti { - delta.Ins = append(delta.Ins, Ins{ti, target[ti:i]}) - } - ti = i + 1 - break - } - } - if !found { - delta.Del = append(delta.Del, Del(si)) - } - } - if ti < len(target) { - delta.Ins = append(delta.Ins, Ins{ti, target[ti:]}) - } - return -} diff --git a/slice/slice_test.go b/slice/slice_test.go deleted file mode 100644 index 8cb2a68..0000000 --- a/slice/slice_test.go +++ /dev/null @@ -1,67 +0,0 @@ -package slice_test - -import ( - "testing" - - "github.com/n-peugnet/dna-backup/slice" - "github.com/n-peugnet/dna-backup/testutils" -) - -func TestPatch(t *testing.T) { - source := slice.Slice{1, 2, 3, 4} - target := slice.Slice{2, 5, 3, 6, 4, 7, 8} - patch := slice.Diff(source, target) - testutils.AssertSame(t, []slice.Del{0}, patch.Del, "Patch del part") - testutils.AssertSame(t, []slice.Ins{ - {1, slice.Slice{5}}, - {3, slice.Slice{6}}, - {5, slice.Slice{7, 8}}, - }, patch.Ins, "Patch ins part") - actual := slice.Patch(source, patch) - testutils.AssertSame(t, target, actual, "Target obtained from patch application") -} - -func TestEmptyPatch(t *testing.T) { - source := slice.Slice{1, 2, 3, 4} - target := slice.Slice{1, 2, 3, 4} - patch := slice.Diff(source, target) - testutils.AssertSame(t, *new([]slice.Del), patch.Del, "Patch del part") - testutils.AssertSame(t, *new([]slice.Ins), patch.Ins, "Patch ins part") - actual := slice.Patch(source, patch) - testutils.AssertSame(t, target, actual, "Target obtained from patch application") -} - -type i struct { - int -} - -func TestStruct(t *testing.T) { - c1, c2, c3, c4, c5, c6, c7, c8 := &i{1}, &i{2}, &i{3}, &i{4}, &i{5}, &i{6}, &i{7}, &i{8} - source := slice.Slice{c1, c2, c3, c4} - target := slice.Slice{&i{5}, c2, c5, c6, &i{4}, c7, &i{8}} - patch := slice.Diff(source, target) - testutils.AssertSame(t, []slice.Del{0, 2}, patch.Del, "Patch del part") - testutils.AssertSame(t, []slice.Ins{ - {0, slice.Slice{c5}}, - {2, slice.Slice{c5, c6}}, - {5, slice.Slice{c7, c8}}, - }, patch.Ins, "Patch ins part") - actual := slice.Patch(source, patch) - testutils.AssertSame(t, target, actual, "Target obtained from patch application") -} - -func TestDeltaString(t *testing.T) { - delta := slice.Delta{ - Del: []slice.Del{0, 3, 4}, - Ins: []slice.Ins{ - {2, slice.Slice{6, 7, 8}}, - {5, slice.Slice{5}}, - }, - } - testutils.AssertSame( - t, - "{Del: [0 3 4] Ins: [{idx:2 count:3} {idx:5 count:1}]}", - delta.String(), - "Delta string representation", - ) -} |