Add better error checking for inline html diff code (#13251)
* Fix error in diff html rendering (#13191) * Fix error in diff html rendering Was missing an optional whitespace check in regex. Also noticed a rare case where diff.Type == Equal would be empty and thus get a newline attached. Fixed that too. Fixes #13177 * Update services/gitdiff/gitdiff.go Co-authored-by: zeripath <art27@cantab.net> * Update gitdiff_test.go * fmt Co-authored-by: zeripath <art27@cantab.net> * Add better error checking for inline html diff code (#13239) * Add better error checking for inline html diff code A better fix for #13191 which cleans up this code a bit and adds basic checking which should avoid writing broken HTML in future situations. * Update gitdiff_test.go * better regex Co-authored-by: zeripath <art27@cantab.net>
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mrsdizzie
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@ -181,64 +181,60 @@ var (
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removedCodePrefix = []byte(`<span class="removed-code">`)
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codeTagSuffix = []byte(`</span>`)
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)
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var addSpanRegex = regexp.MustCompile(`<span [class="[a-z]*]*$`)
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var trailingSpanRegex = regexp.MustCompile(`<span\s*[[:alpha:]="]*?[>]?$`)
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// shouldWriteInline represents combinations where we manually write inline changes
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func shouldWriteInline(diff diffmatchpatch.Diff, lineType DiffLineType) bool {
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if true &&
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diff.Type == diffmatchpatch.DiffEqual ||
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diff.Type == diffmatchpatch.DiffInsert && lineType == DiffLineAdd ||
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diff.Type == diffmatchpatch.DiffDelete && lineType == DiffLineDel {
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return true
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}
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return false
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}
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func diffToHTML(fileName string, diffs []diffmatchpatch.Diff, lineType DiffLineType) template.HTML {
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buf := bytes.NewBuffer(nil)
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var addSpan string
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for i := range diffs {
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match := ""
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for _, diff := range diffs {
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if shouldWriteInline(diff, lineType) {
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if len(match) > 0 {
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diff.Text = match + diff.Text
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match = ""
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}
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// Chroma HTML syntax highlighting is done before diffing individual lines in order to maintain consistency.
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// Since inline changes might split in the middle of a chroma span tag, make we manually put it back together
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// before writing so we don't try insert added/removed code spans in the middle of an existing chroma span
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// and create broken HTML.
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m := trailingSpanRegex.FindStringSubmatchIndex(diff.Text)
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if m != nil {
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match = diff.Text[m[0]:m[1]]
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diff.Text = strings.TrimSuffix(diff.Text, match)
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}
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// Print an existing closing span first before opening added/remove-code span so it doesn't unintentionally close it
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if strings.HasPrefix(diff.Text, "</span>") {
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buf.WriteString("</span>")
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diff.Text = strings.TrimPrefix(diff.Text, "</span>")
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}
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// If we weren't able to fix it then this should avoid broken HTML by not inserting more spans below
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// The previous/next diff section will contain the rest of the tag that is missing here
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if strings.Count(diff.Text, "<") != strings.Count(diff.Text, ">") {
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buf.WriteString(diff.Text)
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continue
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}
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}
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switch {
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case diffs[i].Type == diffmatchpatch.DiffEqual:
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// Looking for the case where our 3rd party diff library previously detected a string difference
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// in the middle of a span class because we highlight them first. This happens when added/deleted code
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// also changes the chroma class name, either partially or fully. If found, just move the openining span code forward into the next section
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// see TestDiffToHTML for examples
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if len(addSpan) > 0 {
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diffs[i].Text = addSpan + diffs[i].Text
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addSpan = ""
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}
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m := addSpanRegex.FindStringSubmatchIndex(diffs[i].Text)
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if m != nil {
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addSpan = diffs[i].Text[m[0]:m[1]]
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buf.WriteString(strings.TrimSuffix(diffs[i].Text, addSpan))
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} else {
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addSpan = ""
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buf.WriteString(getLineContent(diffs[i].Text))
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}
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case diffs[i].Type == diffmatchpatch.DiffInsert && lineType == DiffLineAdd:
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if len(addSpan) > 0 {
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diffs[i].Text = addSpan + diffs[i].Text
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addSpan = ""
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}
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// Print existing closing span first before opening added-code span so it doesn't unintentionally close it
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if strings.HasPrefix(diffs[i].Text, "</span>") {
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buf.WriteString("</span>")
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diffs[i].Text = strings.TrimPrefix(diffs[i].Text, "</span>")
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}
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m := addSpanRegex.FindStringSubmatchIndex(diffs[i].Text)
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if m != nil {
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addSpan = diffs[i].Text[m[0]:m[1]]
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diffs[i].Text = strings.TrimSuffix(diffs[i].Text, addSpan)
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}
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case diff.Type == diffmatchpatch.DiffEqual:
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buf.WriteString(diff.Text)
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case diff.Type == diffmatchpatch.DiffInsert && lineType == DiffLineAdd:
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buf.Write(addedCodePrefix)
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buf.WriteString(getLineContent(diffs[i].Text))
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buf.WriteString(diff.Text)
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buf.Write(codeTagSuffix)
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case diffs[i].Type == diffmatchpatch.DiffDelete && lineType == DiffLineDel:
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if len(addSpan) > 0 {
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diffs[i].Text = addSpan + diffs[i].Text
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addSpan = ""
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}
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if strings.HasPrefix(diffs[i].Text, "</span>") {
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buf.WriteString("</span>")
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diffs[i].Text = strings.TrimPrefix(diffs[i].Text, "</span>")
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}
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m := addSpanRegex.FindStringSubmatchIndex(diffs[i].Text)
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if m != nil {
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addSpan = diffs[i].Text[m[0]:m[1]]
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diffs[i].Text = strings.TrimSuffix(diffs[i].Text, addSpan)
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}
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case diff.Type == diffmatchpatch.DiffDelete && lineType == DiffLineDel:
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buf.Write(removedCodePrefix)
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buf.WriteString(getLineContent(diffs[i].Text))
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buf.WriteString(diff.Text)
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buf.Write(codeTagSuffix)
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}
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}
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@ -50,7 +50,7 @@ func TestDiffToHTML(t *testing.T) {
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{Type: dmp.DiffEqual, Text: "</span> <span class=\"p\">{</span>"},
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}, DiffLineAdd))
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assertEqual(t, "<span class=\"nx\">tagURL</span> <span class=\"o\">:=</span> <span class=\"removed-code\"><span class=\"nx\">fmt</span><span class=\"p\">.</span><span class=\"nf\">Sprintf</span><span class=\"p\">(</span><span class=\"s\">"## [%s](%s/%s/%s/%s?q=&type=all&state=closed&milestone=%d) - %s"</span><span class=\"p\">,</span> <span class=\"nx\">ge</span><span class=\"p\">.</span><span class=\"nx\">Milestone\"</span></span><span class=\"p\">,</span> <span class=\"nx\">ge</span><span class=\"p\">.</span><span class=\"nx\">BaseURL</span><span class=\"p\">,</span> <span class=\"nx\">ge</span><span class=\"p\">.</span><span class=\"nx\">Owner</span><span class=\"p\">,</span> <span class=\"nx\">ge</span><span class=\"p\">.</span><span class=\"nx\">Repo</span><span class=\"p\">,</span> <span class=\"nx\"><span class=\"removed-code\">from</span><span class=\"p\">,</span> <span class=\"nx\">milestoneID</span><span class=\"p\">,</span> <span class=\"nx\">time</span><span class=\"p\">.</span><span class=\"nf\">Now</span><span class=\"p\">(</span><span class=\"p\">)</span><span class=\"p\">.</span><span class=\"nf\">Format</span><span class=\"p\">(</span><span class=\"s\">"2006-01-02"</span><span class=\"p\">)</span></span><span class=\"p\">)</span>", diffToHTML("", []dmp.Diff{
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assertEqual(t, "<span class=\"nx\">tagURL</span> <span class=\"o\">:=</span> <span class=\"removed-code\"><span class=\"nx\">fmt</span><span class=\"p\">.</span><span class=\"nf\">Sprintf</span><span class=\"p\">(</span><span class=\"s\">"## [%s](%s/%s/%s/%s?q=&type=all&state=closed&milestone=%d) - %s"</span><span class=\"p\">,</span> <span class=\"nx\">ge</span><span class=\"p\">.</span><span class=\"nx\">Milestone\"</span></span><span class=\"p\">,</span> <span class=\"nx\">ge</span><span class=\"p\">.</span><span class=\"nx\">BaseURL</span><span class=\"p\">,</span> <span class=\"nx\">ge</span><span class=\"p\">.</span><span class=\"nx\">Owner</span><span class=\"p\">,</span> <span class=\"nx\">ge</span><span class=\"p\">.</span><span class=\"nx\">Repo</span><span class=\"p\">,</span> <span class=\"removed-code\"><span class=\"nx\">from</span><span class=\"p\">,</span> <span class=\"nx\">milestoneID</span><span class=\"p\">,</span> <span class=\"nx\">time</span><span class=\"p\">.</span><span class=\"nf\">Now</span><span class=\"p\">(</span><span class=\"p\">)</span><span class=\"p\">.</span><span class=\"nf\">Format</span><span class=\"p\">(</span><span class=\"s\">"2006-01-02"</span><span class=\"p\">)</span></span><span class=\"p\">)</span>", diffToHTML("", []dmp.Diff{
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{Type: dmp.DiffEqual, Text: "<span class=\"nx\">tagURL</span> <span class=\"o\">:=</span> <span class=\"n"},
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{Type: dmp.DiffDelete, Text: "x\">fmt</span><span class=\"p\">.</span><span class=\"nf\">Sprintf</span><span class=\"p\">(</span><span class=\"s\">"## [%s](%s/%s/%s/%s?q=&type=all&state=closed&milestone=%d) - %s"</span><span class=\"p\">,</span> <span class=\"nx\">ge</span><span class=\"p\">.</span><span class=\"nx\">Milestone\""},
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{Type: dmp.DiffInsert, Text: "f\">getGiteaTagURL</span><span class=\"p\">(</span><span class=\"nx\">client"},
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@ -60,7 +60,7 @@ func TestDiffToHTML(t *testing.T) {
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{Type: dmp.DiffEqual, Text: "</span><span class=\"p\">)</span>"},
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}, DiffLineDel))
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assertEqual(t, "<span class=\"nx\">r</span><span class=\"p\">.</span><span class=\"nf\">WrapperRenderer</span><span class=\"p\">(</span><span class=\"nx\">w</span><span class=\"p\">,</span> <span class=\"nx\"><span class=\"removed-code\">language</span></span><span class=\"removed-code\"><span class=\"p\">,</span> <span class=\"kc\">true</span><span class=\"p\">,</span> <span class=\"nx\">attrs</span></span><span class=\"p\">,</span> <span class=\"kc\">false</span><span class=\"p\">)</span>", diffToHTML("", []dmp.Diff{
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assertEqual(t, "<span class=\"nx\">r</span><span class=\"p\">.</span><span class=\"nf\">WrapperRenderer</span><span class=\"p\">(</span><span class=\"nx\">w</span><span class=\"p\">,</span> <span class=\"removed-code\"><span class=\"nx\">language</span></span><span class=\"removed-code\"><span class=\"p\">,</span> <span class=\"kc\">true</span><span class=\"p\">,</span> <span class=\"nx\">attrs</span></span><span class=\"p\">,</span> <span class=\"kc\">false</span><span class=\"p\">)</span>", diffToHTML("", []dmp.Diff{
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{Type: dmp.DiffEqual, Text: "<span class=\"nx\">r</span><span class=\"p\">.</span><span class=\"nf\">WrapperRenderer</span><span class=\"p\">(</span><span class=\"nx\">w</span><span class=\"p\">,</span> <span class=\"nx\">"},
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{Type: dmp.DiffDelete, Text: "language</span><span "},
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{Type: dmp.DiffEqual, Text: "c"},
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@ -74,6 +74,15 @@ func TestDiffToHTML(t *testing.T) {
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{Type: dmp.DiffInsert, Text: "lass=\"p\">,</span> <span class=\"kc\">true</span><span class=\"p\">,</span> <span class=\"nx\">attrs"},
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{Type: dmp.DiffEqual, Text: "</span><span class=\"p\">,</span> <span class=\"kc\">false</span><span class=\"p\">)</span>"},
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}, DiffLineAdd))
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assertEqual(t, "<span class=\"k\">print</span><span class=\"added-code\"></span><span class=\"added-code\"><span class=\"p\">(</span></span><span class=\"sa\"></span><span class=\"s2\">"</span><span class=\"s2\">// </span><span class=\"s2\">"</span><span class=\"p\">,</span> <span class=\"n\">sys</span><span class=\"o\">.</span><span class=\"n\">argv</span><span class=\"added-code\"><span class=\"p\">)</span></span>", diffToHTML("", []dmp.Diff{
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{Type: dmp.DiffEqual, Text: "<span class=\"k\">print</span>"},
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{Type: dmp.DiffInsert, Text: "<span"},
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{Type: dmp.DiffEqual, Text: " "},
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{Type: dmp.DiffInsert, Text: "class=\"p\">(</span>"},
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{Type: dmp.DiffEqual, Text: "<span class=\"sa\"></span><span class=\"s2\">"</span><span class=\"s2\">// </span><span class=\"s2\">"</span><span class=\"p\">,</span> <span class=\"n\">sys</span><span class=\"o\">.</span><span class=\"n\">argv</span>"},
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{Type: dmp.DiffInsert, Text: "<span class=\"p\">)</span>"},
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}, DiffLineAdd))
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}
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func TestParsePatch_singlefile(t *testing.T) {
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