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Improved diff syntax highlighting fix #12455

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Merged
merged 4 commits into from
Aug 8, 2020
Merged

Improved diff syntax highlighting fix #12455

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d5200bb
Improved diff syntax highlighting fix
mrsdizzie Aug 7, 2020
2a150a2
Merge branch 'master' into more-diff-fix
mrsdizzie Aug 7, 2020
255039f
Better name for global variable
mrsdizzie Aug 7, 2020
c88555e
Merge branch 'master' into more-diff-fix
lafriks Aug 8, 2020
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47 changes: 27 additions & 20 deletions services/gitdiff/gitdiff.go
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,7 @@ import (
"net/url"
"os"
"os/exec"
"regexp"
"sort"
"strconv"
"strings"
Expand Down Expand Up @@ -180,55 +181,61 @@ var (
removedCodePrefix = []byte(`<span class="removed-code">`)
codeTagSuffix = []byte(`</span>`)
)
var addSpanRegex = regexp.MustCompile(`<span class="[a-z]*$`)

func diffToHTML(fileName string, diffs []diffmatchpatch.Diff, lineType DiffLineType) template.HTML {
buf := bytes.NewBuffer(nil)
var addSpan bool
var addSpan string
for i := range diffs {
switch {
case diffs[i].Type == diffmatchpatch.DiffEqual:
// Looking for the case where our 3rd party diff library previously detected a string difference
// in the middle of a span class because we highlight them first. This happens when added/deleted code
// also changes the chroma class name. If found, just move the openining span code forward into the next section
if addSpan {
diffs[i].Text = "<span class=\"" + diffs[i].Text
// also changes the chroma class name, either partially or fully. If found, just move the openining span code forward into the next section
// see TestDiffToHTML for examples
if len(addSpan) > 0 {
diffs[i].Text = addSpan + diffs[i].Text
addSpan = ""
}
if strings.HasSuffix(diffs[i].Text, "<span class=\"") {
addSpan = true
buf.WriteString(strings.TrimSuffix(diffs[i].Text, "<span class=\""))
m := addSpanRegex.FindStringSubmatchIndex(diffs[i].Text)
if m != nil {
addSpan = diffs[i].Text[m[0]:m[1]]
buf.WriteString(strings.TrimSuffix(diffs[i].Text, addSpan))
} else {
addSpan = false
addSpan = ""
buf.WriteString(getLineContent(diffs[i].Text))
}
case diffs[i].Type == diffmatchpatch.DiffInsert && lineType == DiffLineAdd:
if addSpan {
addSpan = false
diffs[i].Text = "<span class=\"" + diffs[i].Text
if len(addSpan) > 0 {
diffs[i].Text = addSpan + diffs[i].Text
addSpan = ""
}
// Print existing closing span first before opening added-code span so it doesn't unintentionally close it
if strings.HasPrefix(diffs[i].Text, "</span>") {
buf.WriteString("</span>")
diffs[i].Text = strings.TrimPrefix(diffs[i].Text, "</span>")
}
if strings.HasSuffix(diffs[i].Text, "<span class=\"") {
addSpan = true
diffs[i].Text = strings.TrimSuffix(diffs[i].Text, "<span class=\"")
m := addSpanRegex.FindStringSubmatchIndex(diffs[i].Text)
if m != nil {
addSpan = diffs[i].Text[m[0]:m[1]]
diffs[i].Text = strings.TrimSuffix(diffs[i].Text, addSpan)
}
buf.Write(addedCodePrefix)
buf.WriteString(getLineContent(diffs[i].Text))
buf.Write(codeTagSuffix)
case diffs[i].Type == diffmatchpatch.DiffDelete && lineType == DiffLineDel:
if addSpan {
addSpan = false
diffs[i].Text = "<span class=\"" + diffs[i].Text
if len(addSpan) > 0 {
diffs[i].Text = addSpan + diffs[i].Text
addSpan = ""
}
if strings.HasPrefix(diffs[i].Text, "</span>") {
buf.WriteString("</span>")
diffs[i].Text = strings.TrimPrefix(diffs[i].Text, "</span>")
}
if strings.HasSuffix(diffs[i].Text, "<span class=\"") {
addSpan = true
diffs[i].Text = strings.TrimSuffix(diffs[i].Text, "<span class=\"")
m := addSpanRegex.FindStringSubmatchIndex(diffs[i].Text)
if m != nil {
addSpan = diffs[i].Text[m[0]:m[1]]
diffs[i].Text = strings.TrimSuffix(diffs[i].Text, addSpan)
}
buf.Write(removedCodePrefix)
buf.WriteString(getLineContent(diffs[i].Text))
Expand Down
10 changes: 10 additions & 0 deletions services/gitdiff/gitdiff_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -50,6 +50,16 @@ func TestDiffToHTML(t *testing.T) {
{Type: dmp.DiffInsert, Text: "</span> <span class=\"o\">||</span> <span class=\"nx\">r</span><span class=\"p\">.</span><span class=\"nx\">GuessLanguage</span><span class=\"p\">)"},
{Type: dmp.DiffEqual, Text: "</span> <span class=\"p\">{</span>"},
}, DiffLineAdd))

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\">&#34;## [%s](%s/%s/%s/%s?q=&amp;type=all&amp;state=closed&amp;milestone=%d) - %s&#34;</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\">&#34;2006-01-02&#34;</span><span class=\"p\">)</span></span><span class=\"p\">)</span>", diffToHTML("", []dmp.Diff{
{Type: dmp.DiffEqual, Text: "<span class=\"nx\">tagURL</span> <span class=\"o\">:=</span> <span class=\"n"},
{Type: dmp.DiffDelete, Text: "x\">fmt</span><span class=\"p\">.</span><span class=\"nf\">Sprintf</span><span class=\"p\">(</span><span class=\"s\">&#34;## [%s](%s/%s/%s/%s?q=&amp;type=all&amp;state=closed&amp;milestone=%d) - %s&#34;</span><span class=\"p\">,</span> <span class=\"nx\">ge</span><span class=\"p\">.</span><span class=\"nx\">Milestone\""},
{Type: dmp.DiffInsert, Text: "f\">getGiteaTagURL</span><span class=\"p\">(</span><span class=\"nx\">client"},
{Type: dmp.DiffEqual, Text: "</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\">"},
{Type: dmp.DiffDelete, Text: "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\">&#34;2006-01-02&#34;</span><span class=\"p\">)"},
{Type: dmp.DiffInsert, Text: "ge</span><span class=\"p\">.</span><span class=\"nx\">Milestone</span><span class=\"p\">,</span> <span class=\"nx\">from</span><span class=\"p\">,</span> <span class=\"nx\">milestoneID"},
{Type: dmp.DiffEqual, Text: "</span><span class=\"p\">)</span>"},
}, DiffLineDel))
}

func TestParsePatch(t *testing.T) {
Expand Down