redactwriter (#181)

* Copy filterwriter from bitrise

* Update filterwriter to use go-utils logger

* Fix linter errors

* Move mocks to root level

* Fix linter errors

* Exclude filterwriter tests from race detector

* Rename package to redactwriter

---------

Co-authored-by: Szabolcs Toth <54896607+tothszabi@users.noreply.github.com>

analytics/client_test.go

@@ -8,7 +8,8 @@ import (
 	"testing"
 	"time"
 
-	"github.com/bitrise-io/go-utils/v2/analytics/mocks"
+	"github.com/bitrise-io/go-utils/v2/mocks"
+
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/mock"
 )

analytics/track_test.go

@@ -6,7 +6,8 @@ import (
 	"testing"
 	"time"
 
-	"github.com/bitrise-io/go-utils/v2/analytics/mocks"
+	"github.com/bitrise-io/go-utils/v2/mocks"
+
 	"github.com/stretchr/testify/mock"
 )
 

redactwriter/range.go

@@ -0,0 +1,41 @@
+package redactwriter
+
+import (
+	"bytes"
+	"sort"
+)
+
+type matchRange struct{ first, last int }
+
+// allRanges returns every indexes of instance of pattern in b, or nil if pattern is not present in b.
+func allRanges(b, pattern []byte) (ranges []matchRange) {
+	i := 0
+	for {
+		sub := b[i:]
+		idx := bytes.Index(sub, pattern)
+		if idx == -1 {
+			return
+		}
+
+		ranges = append(ranges, matchRange{first: idx + i, last: idx + i + len(pattern)})
+
+		i += idx + 1
+		if i > len(b)-1 {
+			return
+		}
+	}
+}
+
+// mergeAllRanges merges every overlapping ranges in r.
+func mergeAllRanges(r []matchRange) []matchRange {
+	sort.Slice(r, func(i, j int) bool { return r[i].first < r[j].first })
+	for i := 0; i < len(r)-1; i++ {
+		for i+1 < len(r) && r[i+1].first <= r[i].last {
+			if r[i+1].last > r[i].last {
+				r[i].last = r[i+1].last
+			}
+			r = append(r[:i+1], r[i+2:]...)
+		}
+	}
+	return r
+}

redactwriter/range_test.go

@@ -0,0 +1,77 @@
+package redactwriter
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestAllRanges(t *testing.T) {
+	{
+		ranges := allRanges([]byte("test"), []byte("t"))
+		require.Equal(t, []matchRange{{first: 0, last: 1}, {first: 3, last: 4}}, ranges)
+	}
+
+	{
+		ranges := allRanges([]byte("test rangetest"), []byte("test"))
+		require.Equal(t, []matchRange{{first: 0, last: 4}, {first: 10, last: 14}}, ranges)
+	}
+
+	{
+		ranges := allRanges([]byte("\n"), []byte("\n"))
+		require.Equal(t, []matchRange{{first: 0, last: 1}}, ranges)
+	}
+
+	{
+		ranges := allRanges([]byte("test\n"), []byte("\n"))
+		require.Equal(t, []matchRange{{first: 4, last: 5}}, ranges)
+	}
+
+	{
+		ranges := allRanges([]byte("\n\ntest\n"), []byte("\n"))
+		require.Equal(t, []matchRange{{first: 0, last: 1}, {first: 1, last: 2}, {first: 6, last: 7}}, ranges)
+	}
+
+	{
+		ranges := allRanges([]byte("\n\ntest\n"), []byte("test\n"))
+		require.Equal(t, []matchRange{{first: 2, last: 7}}, ranges)
+	}
+}
+
+func TestMergeAllRanges(t *testing.T) {
+	var testCases = []struct {
+		name   string
+		ranges []matchRange
+		want   []matchRange
+	}{
+		{
+			name:   "merges overlapping ranges",
+			ranges: []matchRange{{0, 2}, {1, 3}},
+			want:   []matchRange{{0, 3}},
+		},
+		{
+			name:   "does not merge distinct ranges",
+			ranges: []matchRange{{0, 2}, {3, 5}},
+			want:   []matchRange{{0, 2}, {3, 5}},
+		},
+		{
+			name:   "returns the wider range",
+			ranges: []matchRange{{0, 2}, {1, 2}},
+			want:   []matchRange{{0, 2}},
+		},
+		{
+			name:   "complex test",
+			ranges: []matchRange{{11, 15}, {0, 2}, {11, 13}, {2, 4}, {6, 9}, {5, 10}},
+			want:   []matchRange{{0, 4}, {5, 10}, {11, 15}},
+		},
+	}
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			if got := mergeAllRanges(tc.ranges); !reflect.DeepEqual(got, tc.want) {
+				t.Errorf("got %v, want %v", got, tc.want)
+			}
+		})
+	}
+
+}