license metadata html notice files
Introduce the below command-line tool:
htmlnotice outputs a NOTICE.html file constructed from the license
texts of the transitive closure of dependencies.
Bug: 68860345
Bug: 151177513
Bug: 151953481
Bug: 213388645
Bug: 210912771
Test: m all
Test: m systemlicense
Test: m htmlnotice; out/soong/host/linux-x85/htmlnotice ...
where ... is the path to the .meta_lic file for the system image. In my
case if
$ export PRODUCT=$(realpath $ANDROID_PRODUCT_OUT --relative-to=$PWD)
... can be expressed as:
${PRODUCT}/gen/META/lic_intermediates/${PRODUCT}/system.img.meta_lic
Change-Id: Idbbeb2939d8cbf497237516fe468004fcd2d72a1
diff --git a/tools/compliance/cmd/htmlnotice_test.go b/tools/compliance/cmd/htmlnotice_test.go
new file mode 100644
index 0000000..8d3ea02
--- /dev/null
+++ b/tools/compliance/cmd/htmlnotice_test.go
@@ -0,0 +1,812 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+ "bufio"
+ "bytes"
+ "fmt"
+ "html"
+ "os"
+ "regexp"
+ "strings"
+ "testing"
+)
+
+var (
+ horizontalRule = regexp.MustCompile(`^\s*<hr>\s*$`)
+ bodyTag = regexp.MustCompile(`^\s*<body>\s*$`)
+ boilerPlate = regexp.MustCompile(`^\s*(?:<ul class="file-list">|<ul>|</.*)\s*$`)
+ tocTag = regexp.MustCompile(`^\s*<ul class="toc">\s*$`)
+ libraryName = regexp.MustCompile(`^\s*<strong>(.*)</strong>\s\s*used\s\s*by\s*:\s*$`)
+ licenseText = regexp.MustCompile(`^\s*<a id="[^"]{32}"/><pre class="license-text">(.*)$`)
+ titleTag = regexp.MustCompile(`^\s*<title>(.*)</title>\s*$`)
+ h1Tag = regexp.MustCompile(`^\s*<h1>(.*)</h1>\s*$`)
+ usedByTarget = regexp.MustCompile(`^\s*<li>(?:<a href="#id[0-9]+">)?((?:out/(?:[^/<]*/)+)[^/<]*)(?:</a>)?\s*$`)
+ installTarget = regexp.MustCompile(`^\s*<li id="id[0-9]+"><strong>(.*)</strong>\s*$`)
+ libReference = regexp.MustCompile(`^\s*<li><a href="#[^"]{32}">(.*)</a>\s*$`)
+)
+
+func Test(t *testing.T) {
+ tests := []struct {
+ condition string
+ name string
+ roots []string
+ includeTOC bool
+ stripPrefix string
+ title string
+ expectedOut []matcher
+ }{
+ {
+ condition: "firstparty",
+ name: "apex",
+ roots: []string{"highest.apex.meta_lic"},
+ expectedOut: []matcher{
+ hr{},
+ library{"Android"},
+ usedBy{"highest.apex"},
+ usedBy{"highest.apex/bin/bin1"},
+ usedBy{"highest.apex/bin/bin2"},
+ usedBy{"highest.apex/lib/liba.so"},
+ usedBy{"highest.apex/lib/libb.so"},
+ firstParty{},
+ },
+ },
+ {
+ condition: "firstparty",
+ name: "apex+toc",
+ roots: []string{"highest.apex.meta_lic"},
+ includeTOC: true,
+ expectedOut: []matcher{
+ toc{},
+ target{"highest.apex"},
+ uses{"Android"},
+ target{"highest.apex/bin/bin1"},
+ uses{"Android"},
+ target{"highest.apex/bin/bin2"},
+ uses{"Android"},
+ target{"highest.apex/lib/liba.so"},
+ uses{"Android"},
+ target{"highest.apex/lib/libb.so"},
+ uses{"Android"},
+ hr{},
+ library{"Android"},
+ usedBy{"highest.apex"},
+ usedBy{"highest.apex/bin/bin1"},
+ usedBy{"highest.apex/bin/bin2"},
+ usedBy{"highest.apex/lib/liba.so"},
+ usedBy{"highest.apex/lib/libb.so"},
+ firstParty{},
+ },
+ },
+ {
+ condition: "firstparty",
+ name: "apex-with-title",
+ roots: []string{"highest.apex.meta_lic"},
+ title: "Emperor",
+ expectedOut: []matcher{
+ pageTitle{"Emperor"},
+ hr{},
+ library{"Android"},
+ usedBy{"highest.apex"},
+ usedBy{"highest.apex/bin/bin1"},
+ usedBy{"highest.apex/bin/bin2"},
+ usedBy{"highest.apex/lib/liba.so"},
+ usedBy{"highest.apex/lib/libb.so"},
+ firstParty{},
+ },
+ },
+ {
+ condition: "firstparty",
+ name: "apex-with-title+toc",
+ roots: []string{"highest.apex.meta_lic"},
+ includeTOC: true,
+ title: "Emperor",
+ expectedOut: []matcher{
+ pageTitle{"Emperor"},
+ toc{},
+ target{"highest.apex"},
+ uses{"Android"},
+ target{"highest.apex/bin/bin1"},
+ uses{"Android"},
+ target{"highest.apex/bin/bin2"},
+ uses{"Android"},
+ target{"highest.apex/lib/liba.so"},
+ uses{"Android"},
+ target{"highest.apex/lib/libb.so"},
+ uses{"Android"},
+ hr{},
+ library{"Android"},
+ usedBy{"highest.apex"},
+ usedBy{"highest.apex/bin/bin1"},
+ usedBy{"highest.apex/bin/bin2"},
+ usedBy{"highest.apex/lib/liba.so"},
+ usedBy{"highest.apex/lib/libb.so"},
+ firstParty{},
+ },
+ },
+ {
+ condition: "firstparty",
+ name: "container",
+ roots: []string{"container.zip.meta_lic"},
+ expectedOut: []matcher{
+ hr{},
+ library{"Android"},
+ usedBy{"container.zip"},
+ usedBy{"container.zip/bin1"},
+ usedBy{"container.zip/bin2"},
+ usedBy{"container.zip/liba.so"},
+ usedBy{"container.zip/libb.so"},
+ firstParty{},
+ },
+ },
+ {
+ condition: "firstparty",
+ name: "application",
+ roots: []string{"application.meta_lic"},
+ expectedOut: []matcher{
+ hr{},
+ library{"Android"},
+ usedBy{"application"},
+ firstParty{},
+ },
+ },
+ {
+ condition: "firstparty",
+ name: "binary",
+ roots: []string{"bin/bin1.meta_lic"},
+ expectedOut: []matcher{
+ hr{},
+ library{"Android"},
+ usedBy{"bin/bin1"},
+ firstParty{},
+ },
+ },
+ {
+ condition: "firstparty",
+ name: "library",
+ roots: []string{"lib/libd.so.meta_lic"},
+ expectedOut: []matcher{
+ hr{},
+ library{"Android"},
+ usedBy{"lib/libd.so"},
+ firstParty{},
+ },
+ },
+ {
+ condition: "notice",
+ name: "apex",
+ roots: []string{"highest.apex.meta_lic"},
+ expectedOut: []matcher{
+ hr{},
+ library{"Android"},
+ usedBy{"highest.apex"},
+ usedBy{"highest.apex/bin/bin1"},
+ usedBy{"highest.apex/bin/bin2"},
+ usedBy{"highest.apex/lib/libb.so"},
+ firstParty{},
+ hr{},
+ library{"Device"},
+ usedBy{"highest.apex/bin/bin1"},
+ usedBy{"highest.apex/lib/liba.so"},
+ library{"External"},
+ usedBy{"highest.apex/bin/bin1"},
+ notice{},
+ },
+ },
+ {
+ condition: "notice",
+ name: "container",
+ roots: []string{"container.zip.meta_lic"},
+ expectedOut: []matcher{
+ hr{},
+ library{"Android"},
+ usedBy{"container.zip"},
+ usedBy{"container.zip/bin1"},
+ usedBy{"container.zip/bin2"},
+ usedBy{"container.zip/libb.so"},
+ firstParty{},
+ hr{},
+ library{"Device"},
+ usedBy{"container.zip/bin1"},
+ usedBy{"container.zip/liba.so"},
+ library{"External"},
+ usedBy{"container.zip/bin1"},
+ notice{},
+ },
+ },
+ {
+ condition: "notice",
+ name: "application",
+ roots: []string{"application.meta_lic"},
+ expectedOut: []matcher{
+ hr{},
+ library{"Android"},
+ usedBy{"application"},
+ firstParty{},
+ hr{},
+ library{"Device"},
+ usedBy{"application"},
+ notice{},
+ },
+ },
+ {
+ condition: "notice",
+ name: "binary",
+ roots: []string{"bin/bin1.meta_lic"},
+ expectedOut: []matcher{
+ hr{},
+ library{"Android"},
+ usedBy{"bin/bin1"},
+ firstParty{},
+ hr{},
+ library{"Device"},
+ usedBy{"bin/bin1"},
+ library{"External"},
+ usedBy{"bin/bin1"},
+ notice{},
+ },
+ },
+ {
+ condition: "notice",
+ name: "library",
+ roots: []string{"lib/libd.so.meta_lic"},
+ expectedOut: []matcher{
+ hr{},
+ library{"External"},
+ usedBy{"lib/libd.so"},
+ notice{},
+ },
+ },
+ {
+ condition: "reciprocal",
+ name: "apex",
+ roots: []string{"highest.apex.meta_lic"},
+ expectedOut: []matcher{
+ hr{},
+ library{"Android"},
+ usedBy{"highest.apex"},
+ usedBy{"highest.apex/bin/bin1"},
+ usedBy{"highest.apex/bin/bin2"},
+ usedBy{"highest.apex/lib/libb.so"},
+ firstParty{},
+ hr{},
+ library{"Device"},
+ usedBy{"highest.apex/bin/bin1"},
+ usedBy{"highest.apex/lib/liba.so"},
+ library{"External"},
+ usedBy{"highest.apex/bin/bin1"},
+ reciprocal{},
+ },
+ },
+ {
+ condition: "reciprocal",
+ name: "container",
+ roots: []string{"container.zip.meta_lic"},
+ expectedOut: []matcher{
+ hr{},
+ library{"Android"},
+ usedBy{"container.zip"},
+ usedBy{"container.zip/bin1"},
+ usedBy{"container.zip/bin2"},
+ usedBy{"container.zip/libb.so"},
+ firstParty{},
+ hr{},
+ library{"Device"},
+ usedBy{"container.zip/bin1"},
+ usedBy{"container.zip/liba.so"},
+ library{"External"},
+ usedBy{"container.zip/bin1"},
+ reciprocal{},
+ },
+ },
+ {
+ condition: "reciprocal",
+ name: "application",
+ roots: []string{"application.meta_lic"},
+ expectedOut: []matcher{
+ hr{},
+ library{"Android"},
+ usedBy{"application"},
+ firstParty{},
+ hr{},
+ library{"Device"},
+ usedBy{"application"},
+ reciprocal{},
+ },
+ },
+ {
+ condition: "reciprocal",
+ name: "binary",
+ roots: []string{"bin/bin1.meta_lic"},
+ expectedOut: []matcher{
+ hr{},
+ library{"Android"},
+ usedBy{"bin/bin1"},
+ firstParty{},
+ hr{},
+ library{"Device"},
+ usedBy{"bin/bin1"},
+ library{"External"},
+ usedBy{"bin/bin1"},
+ reciprocal{},
+ },
+ },
+ {
+ condition: "reciprocal",
+ name: "library",
+ roots: []string{"lib/libd.so.meta_lic"},
+ expectedOut: []matcher{
+ hr{},
+ library{"External"},
+ usedBy{"lib/libd.so"},
+ notice{},
+ },
+ },
+ {
+ condition: "restricted",
+ name: "apex",
+ roots: []string{"highest.apex.meta_lic"},
+ expectedOut: []matcher{
+ hr{},
+ library{"Android"},
+ usedBy{"highest.apex"},
+ usedBy{"highest.apex/bin/bin1"},
+ usedBy{"highest.apex/bin/bin2"},
+ firstParty{},
+ hr{},
+ library{"Android"},
+ usedBy{"highest.apex/bin/bin2"},
+ usedBy{"highest.apex/lib/libb.so"},
+ library{"Device"},
+ usedBy{"highest.apex/bin/bin1"},
+ usedBy{"highest.apex/lib/liba.so"},
+ restricted{},
+ hr{},
+ library{"External"},
+ usedBy{"highest.apex/bin/bin1"},
+ reciprocal{},
+ },
+ },
+ {
+ condition: "restricted",
+ name: "container",
+ roots: []string{"container.zip.meta_lic"},
+ expectedOut: []matcher{
+ hr{},
+ library{"Android"},
+ usedBy{"container.zip"},
+ usedBy{"container.zip/bin1"},
+ usedBy{"container.zip/bin2"},
+ firstParty{},
+ hr{},
+ library{"Android"},
+ usedBy{"container.zip/bin2"},
+ usedBy{"container.zip/libb.so"},
+ library{"Device"},
+ usedBy{"container.zip/bin1"},
+ usedBy{"container.zip/liba.so"},
+ restricted{},
+ hr{},
+ library{"External"},
+ usedBy{"container.zip/bin1"},
+ reciprocal{},
+ },
+ },
+ {
+ condition: "restricted",
+ name: "application",
+ roots: []string{"application.meta_lic"},
+ expectedOut: []matcher{
+ hr{},
+ library{"Android"},
+ usedBy{"application"},
+ firstParty{},
+ hr{},
+ library{"Device"},
+ usedBy{"application"},
+ restricted{},
+ },
+ },
+ {
+ condition: "restricted",
+ name: "binary",
+ roots: []string{"bin/bin1.meta_lic"},
+ expectedOut: []matcher{
+ hr{},
+ library{"Android"},
+ usedBy{"bin/bin1"},
+ firstParty{},
+ hr{},
+ library{"Device"},
+ usedBy{"bin/bin1"},
+ restricted{},
+ hr{},
+ library{"External"},
+ usedBy{"bin/bin1"},
+ reciprocal{},
+ },
+ },
+ {
+ condition: "restricted",
+ name: "library",
+ roots: []string{"lib/libd.so.meta_lic"},
+ expectedOut: []matcher{
+ hr{},
+ library{"External"},
+ usedBy{"lib/libd.so"},
+ notice{},
+ },
+ },
+ {
+ condition: "proprietary",
+ name: "apex",
+ roots: []string{"highest.apex.meta_lic"},
+ expectedOut: []matcher{
+ hr{},
+ library{"Android"},
+ usedBy{"highest.apex/bin/bin2"},
+ usedBy{"highest.apex/lib/libb.so"},
+ restricted{},
+ hr{},
+ library{"Android"},
+ usedBy{"highest.apex"},
+ usedBy{"highest.apex/bin/bin1"},
+ firstParty{},
+ hr{},
+ library{"Android"},
+ usedBy{"highest.apex/bin/bin2"},
+ library{"Device"},
+ usedBy{"highest.apex/bin/bin1"},
+ usedBy{"highest.apex/lib/liba.so"},
+ library{"External"},
+ usedBy{"highest.apex/bin/bin1"},
+ proprietary{},
+ },
+ },
+ {
+ condition: "proprietary",
+ name: "container",
+ roots: []string{"container.zip.meta_lic"},
+ expectedOut: []matcher{
+ hr{},
+ library{"Android"},
+ usedBy{"container.zip/bin2"},
+ usedBy{"container.zip/libb.so"},
+ restricted{},
+ hr{},
+ library{"Android"},
+ usedBy{"container.zip"},
+ usedBy{"container.zip/bin1"},
+ firstParty{},
+ hr{},
+ library{"Android"},
+ usedBy{"container.zip/bin2"},
+ library{"Device"},
+ usedBy{"container.zip/bin1"},
+ usedBy{"container.zip/liba.so"},
+ library{"External"},
+ usedBy{"container.zip/bin1"},
+ proprietary{},
+ },
+ },
+ {
+ condition: "proprietary",
+ name: "application",
+ roots: []string{"application.meta_lic"},
+ expectedOut: []matcher{
+ hr{},
+ library{"Android"},
+ usedBy{"application"},
+ firstParty{},
+ hr{},
+ library{"Device"},
+ usedBy{"application"},
+ proprietary{},
+ },
+ },
+ {
+ condition: "proprietary",
+ name: "binary",
+ roots: []string{"bin/bin1.meta_lic"},
+ expectedOut: []matcher{
+ hr{},
+ library{"Android"},
+ usedBy{"bin/bin1"},
+ firstParty{},
+ hr{},
+ library{"Device"},
+ usedBy{"bin/bin1"},
+ library{"External"},
+ usedBy{"bin/bin1"},
+ proprietary{},
+ },
+ },
+ {
+ condition: "proprietary",
+ name: "library",
+ roots: []string{"lib/libd.so.meta_lic"},
+ expectedOut: []matcher{
+ hr{},
+ library{"External"},
+ usedBy{"lib/libd.so"},
+ notice{},
+ },
+ },
+ }
+ for _, tt := range tests {
+ t.Run(tt.condition+" "+tt.name, func(t *testing.T) {
+ stdout := &bytes.Buffer{}
+ stderr := &bytes.Buffer{}
+
+ rootFiles := make([]string, 0, len(tt.roots))
+ for _, r := range tt.roots {
+ rootFiles = append(rootFiles, "testdata/"+tt.condition+"/"+r)
+ }
+
+ ctx := context{stdout, stderr, os.DirFS("."), tt.includeTOC, tt.stripPrefix, tt.title}
+
+ err := htmlNotice(&ctx, rootFiles...)
+ if err != nil {
+ t.Fatalf("htmlnotice: error = %w, stderr = %v", err, stderr)
+ return
+ }
+ if stderr.Len() > 0 {
+ t.Errorf("htmlnotice: gotStderr = %v, want none", stderr)
+ }
+
+ t.Logf("got stdout: %s", stdout.String())
+
+ t.Logf("want stdout: %s", matcherList(tt.expectedOut).String())
+
+ out := bufio.NewScanner(stdout)
+ lineno := 0
+ inBody := false
+ hasTitle := false
+ ttle, expectTitle := tt.expectedOut[0].(pageTitle)
+ for out.Scan() {
+ line := out.Text()
+ if strings.TrimLeft(line, " ") == "" {
+ continue
+ }
+ if !inBody {
+ if expectTitle {
+ if tl := checkTitle(line); 0 < len(tl) {
+ if tl != ttle.t {
+ t.Errorf("htmlnotice: unexpected title: got %q, want %q", tl, ttle.t)
+ }
+ hasTitle = true
+ }
+ }
+ if bodyTag.MatchString(line) {
+ inBody = true
+ if expectTitle && !hasTitle {
+ t.Errorf("htmlnotice: missing title: got no <title> tag, want <title>%s</title>", ttle.t)
+ }
+ }
+ continue
+ }
+ if boilerPlate.MatchString(line) {
+ continue
+ }
+ if len(tt.expectedOut) <= lineno {
+ t.Errorf("htmlnotice: unexpected output at line %d: got %q, want nothing (wanted %d lines)", lineno+1, line, len(tt.expectedOut))
+ } else if !tt.expectedOut[lineno].isMatch(line) {
+ t.Errorf("htmlnotice: unexpected output at line %d: got %q, want %q", lineno+1, line, tt.expectedOut[lineno].String())
+ }
+ lineno++
+ }
+ if !inBody {
+ t.Errorf("htmlnotice: missing body: got no <body> tag, want <body> tag followed by %s", matcherList(tt.expectedOut).String())
+ return
+ }
+ for ; lineno < len(tt.expectedOut); lineno++ {
+ t.Errorf("htmlnotice: missing output line %d: ended early, want %q", lineno+1, tt.expectedOut[lineno].String())
+ }
+ })
+ }
+}
+
+func checkTitle(line string) string {
+ groups := titleTag.FindStringSubmatch(line)
+ if len(groups) != 2 {
+ return ""
+ }
+ return groups[1]
+}
+
+type matcher interface {
+ isMatch(line string) bool
+ String() string
+}
+
+type pageTitle struct {
+ t string
+}
+
+func (m pageTitle) isMatch(line string) bool {
+ groups := h1Tag.FindStringSubmatch(line)
+ if len(groups) != 2 {
+ return false
+ }
+ return groups[1] == html.EscapeString(m.t)
+}
+
+func (m pageTitle) String() string {
+ return " <h1>" + html.EscapeString(m.t) + "</h1>"
+}
+
+type toc struct{}
+
+func (m toc) isMatch(line string) bool {
+ return tocTag.MatchString(line)
+}
+
+func (m toc) String() string {
+ return ` <ul class="toc">`
+}
+
+type target struct {
+ name string
+}
+
+func (m target) isMatch(line string) bool {
+ groups := installTarget.FindStringSubmatch(line)
+ if len(groups) != 2 {
+ return false
+ }
+ return strings.HasPrefix(groups[1], "out/") && strings.HasSuffix(groups[1], "/"+html.EscapeString(m.name))
+}
+
+func (m target) String() string {
+ return ` <li id="id#"><strong>` + html.EscapeString(m.name) + `</strong>`
+}
+
+type uses struct {
+ name string
+}
+
+func (m uses) isMatch(line string) bool {
+ groups := libReference.FindStringSubmatch(line)
+ if len(groups) != 2 {
+ return false
+ }
+ return groups[1] == html.EscapeString(m.name)
+}
+
+func (m uses) String() string {
+ return ` <li><a href="#hash">` + html.EscapeString(m.name) + `</a>`
+}
+
+type hr struct{}
+
+func (m hr) isMatch(line string) bool {
+ return horizontalRule.MatchString(line)
+}
+
+func (m hr) String() string {
+ return " <hr>"
+}
+
+type library struct {
+ name string
+}
+
+func (m library) isMatch(line string) bool {
+ groups := libraryName.FindStringSubmatch(line)
+ if len(groups) != 2 {
+ return false
+ }
+ return groups[1] == html.EscapeString(m.name)
+}
+
+func (m library) String() string {
+ return " <strong>" + html.EscapeString(m.name) + "</strong> used by:"
+}
+
+type usedBy struct {
+ name string
+}
+
+func (m usedBy) isMatch(line string) bool {
+ groups := usedByTarget.FindStringSubmatch(line)
+ if len(groups) != 2 {
+ return false
+ }
+ return strings.HasPrefix(groups[1], "out/") && strings.HasSuffix(groups[1], "/"+html.EscapeString(m.name))
+}
+
+func (m usedBy) String() string {
+ return " <li>out/.../" + html.EscapeString(m.name)
+}
+
+func matchesText(line, text string) bool {
+ groups := licenseText.FindStringSubmatch(line)
+ if len(groups) != 2 {
+ return false
+ }
+ return groups[1] == html.EscapeString(text)
+}
+
+func expectedText(text string) string {
+ return ` <a href="#hash"/><pre class="license-text">` + html.EscapeString(text)
+}
+
+type firstParty struct{}
+
+func (m firstParty) isMatch(line string) bool {
+ return matchesText(line, "&&&First Party License&&&")
+}
+
+func (m firstParty) String() string {
+ return expectedText("&&&First Party License&&&")
+}
+
+type notice struct{}
+
+func (m notice) isMatch(line string) bool {
+ return matchesText(line, "%%%Notice License%%%")
+}
+
+func (m notice) String() string {
+ return expectedText("%%%Notice License%%%")
+}
+
+type reciprocal struct{}
+
+func (m reciprocal) isMatch(line string) bool {
+ return matchesText(line, "$$$Reciprocal License$$$")
+}
+
+func (m reciprocal) String() string {
+ return expectedText("$$$Reciprocal License$$$")
+}
+
+type restricted struct{}
+
+func (m restricted) isMatch(line string) bool {
+ return matchesText(line, "###Restricted License###")
+}
+
+func (m restricted) String() string {
+ return expectedText("###Restricted License###")
+}
+
+type proprietary struct{}
+
+func (m proprietary) isMatch(line string) bool {
+ return matchesText(line, "@@@Proprietary License@@@")
+}
+
+func (m proprietary) String() string {
+ return expectedText("@@@Proprietary License@@@")
+}
+
+type matcherList []matcher
+
+func (l matcherList) String() string {
+ var sb strings.Builder
+ for _, m := range l {
+ s := m.String()
+ if s[:3] == s[len(s)-3:] {
+ fmt.Fprintln(&sb)
+ }
+ fmt.Fprintf(&sb, "%s\n", s)
+ if s[:3] == s[len(s)-3:] {
+ fmt.Fprintln(&sb)
+ }
+ }
+ return sb.String()
+}