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Rework file highlight rendering and fix yaml copy-paste (#19967)
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* Rework file highlight rendering and fix yaml copy-paste

* use Split+Trim to replace tag parser

* remove unnecessary bytes.Count

* remove newLineInHTML = "
"

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
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@silverwind @wxiaoguang
silverwind and wxiaoguang authored Jul 30, 2022
1 parent 0e61a74 commit ae3dde1
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Showing 3 changed files with 177 additions and 143 deletions.
97 changes: 41 additions & 56 deletions modules/highlight/highlight.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@ import (
"bytes"
"fmt"
gohtml "html"
"io"
"path/filepath"
"strings"
"sync"
Expand All @@ -26,7 +27,7 @@ import (
)

// don't index files larger than this many bytes for performance purposes
const sizeLimit = 1000000
const sizeLimit = 1024 * 1024

var (
// For custom user mapping
Expand All @@ -46,7 +47,6 @@ func NewContext() {
highlightMapping[keys[i].Name()] = keys[i].Value()
}
}

// The size 512 is simply a conservative rule of thumb
c, err := lru.New2Q(512)
if err != nil {
Expand All @@ -60,7 +60,7 @@ func NewContext() {
func Code(fileName, language, code string) string {
NewContext()

// diff view newline will be passed as empty, change to literal \n so it can be copied
// diff view newline will be passed as empty, change to literal '\n' so it can be copied
// preserve literal newline in blame view
if code == "" || code == "\n" {
return "\n"
Expand Down Expand Up @@ -128,36 +128,32 @@ func CodeFromLexer(lexer chroma.Lexer, code string) string {
return code
}

htmlw.Flush()
_ = htmlw.Flush()
// Chroma will add newlines for certain lexers in order to highlight them properly
// Once highlighted, strip them here so they don't cause copy/paste trouble in HTML output
// Once highlighted, strip them here, so they don't cause copy/paste trouble in HTML output
return strings.TrimSuffix(htmlbuf.String(), "\n")
}

// File returns a slice of chroma syntax highlighted lines of code
func File(numLines int, fileName, language string, code []byte) []string {
// File returns a slice of chroma syntax highlighted HTML lines of code
func File(fileName, language string, code []byte) ([]string, error) {
NewContext()

if len(code) > sizeLimit {
return plainText(string(code), numLines)
return PlainText(code), nil
}

formatter := html.New(html.WithClasses(true),
html.WithLineNumbers(false),
html.PreventSurroundingPre(true),
)

if formatter == nil {
log.Error("Couldn't create chroma formatter")
return plainText(string(code), numLines)
}

htmlbuf := bytes.Buffer{}
htmlw := bufio.NewWriter(&htmlbuf)
htmlBuf := bytes.Buffer{}
htmlWriter := bufio.NewWriter(&htmlBuf)

var lexer chroma.Lexer

// provided language overrides everything
if len(language) > 0 {
if language != "" {
lexer = lexers.Get(language)
}

Expand All @@ -168,9 +164,9 @@ func File(numLines int, fileName, language string, code []byte) []string {
}

if lexer == nil {
language := analyze.GetCodeLanguage(fileName, code)
guessLanguage := analyze.GetCodeLanguage(fileName, code)

lexer = lexers.Get(language)
lexer = lexers.Get(guessLanguage)
if lexer == nil {
lexer = lexers.Match(fileName)
if lexer == nil {
Expand All @@ -181,54 +177,43 @@ func File(numLines int, fileName, language string, code []byte) []string {

iterator, err := lexer.Tokenise(nil, string(code))
if err != nil {
log.Error("Can't tokenize code: %v", err)
return plainText(string(code), numLines)
return nil, fmt.Errorf("can't tokenize code: %w", err)
}

err = formatter.Format(htmlw, styles.GitHub, iterator)
err = formatter.Format(htmlWriter, styles.GitHub, iterator)
if err != nil {
log.Error("Can't format code: %v", err)
return plainText(string(code), numLines)
return nil, fmt.Errorf("can't format code: %w", err)
}

htmlw.Flush()
finalNewLine := false
if len(code) > 0 {
finalNewLine = code[len(code)-1] == '\n'
}
_ = htmlWriter.Flush()

m := make([]string, 0, numLines)
for _, v := range strings.SplitN(htmlbuf.String(), "\n", numLines) {
content := v
// need to keep lines that are only \n so copy/paste works properly in browser
if content == "" {
content = "\n"
} else if content == `</span><span class="w">` {
content += "\n</span>"
} else if content == `</span></span><span class="line"><span class="cl">` {
content += "\n"
}
content = strings.TrimSuffix(content, `<span class="w">`)
content = strings.TrimPrefix(content, `</span>`)
m = append(m, content)
// at the moment, Chroma generates stable output `<span class="line"><span class="cl">...\n</span></span>` for each line
htmlStr := htmlBuf.String()
lines := strings.Split(htmlStr, `<span class="line"><span class="cl">`)
m := make([]string, 0, len(lines))
for i := 1; i < len(lines); i++ {
line := lines[i]
line = strings.TrimSuffix(line, "</span></span>")
m = append(m, line)
}
if finalNewLine {
m = append(m, "<span class=\"w\">\n</span>")
}

return m
return m, nil
}

// return unhiglighted map
func plainText(code string, numLines int) []string {
m := make([]string, 0, numLines)
for _, v := range strings.SplitN(code, "\n", numLines) {
content := v
// need to keep lines that are only \n so copy/paste works properly in browser
if content == "" {
content = "\n"
// PlainText returns non-highlighted HTML for code
func PlainText(code []byte) []string {
r := bufio.NewReader(bytes.NewReader(code))
m := make([]string, 0, bytes.Count(code, []byte{'\n'})+1)
for {
content, err := r.ReadString('\n')
if err != nil && err != io.EOF {
log.Error("failed to read string from buffer: %v", err)
break
}
if content == "" && err == io.EOF {
break
}
m = append(m, gohtml.EscapeString(content))
s := gohtml.EscapeString(content)
m = append(m, s)
}
return m
}
197 changes: 123 additions & 74 deletions modules/highlight/highlight_test.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -8,97 +8,146 @@ import (
"strings"
"testing"

"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/util"

"github.com/stretchr/testify/assert"
"gopkg.in/ini.v1"
)

func lines(s string) []string {
return strings.Split(strings.ReplaceAll(strings.TrimSpace(s), `\n`, "\n"), "\n")
}

func TestFile(t *testing.T) {
setting.Cfg = ini.Empty()
tests := []struct {
name string
numLines int
fileName string
code string
want string
name string
code string
want []string
}{
{
name: ".drone.yml",
numLines: 12,
fileName: ".drone.yml",
code: util.Dedent(`
kind: pipeline
name: default
name: "empty.py",
code: "",
want: lines(""),
},
{
name: "tags.txt",
code: "<>",
want: lines("&lt;&gt;"),
},
{
name: "tags.py",
code: "<>",
want: lines(`<span class="o">&lt;</span><span class="o">&gt;</span>`),
},
{
name: "eol-no.py",
code: "a=1",
want: lines(`<span class="n">a</span><span class="o">=</span><span class="mi">1</span>`),
},
{
name: "eol-newline1.py",
code: "a=1\n",
want: lines(`<span class="n">a</span><span class="o">=</span><span class="mi">1</span>\n`),
},
{
name: "eol-newline2.py",
code: "a=1\n\n",
want: lines(`
<span class="n">a</span><span class="o">=</span><span class="mi">1</span>\n
\n
`,
),
},
{
name: "empty-line-with-space.py",
code: strings.ReplaceAll(strings.TrimSpace(`
def:
a=1
steps:
- name: test
image: golang:1.13
environment:
GOPROXY: https://goproxy.cn
commands:
- go get -u
- go build -v
- go test -v -race -coverprofile=coverage.txt -covermode=atomic
`),
want: util.Dedent(`
<span class="line"><span class="cl"><span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l">pipeline</span>
</span></span><span class="line"><span class="cl"><span class="w"></span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l">default</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"><span class="w"></span><span class="nt">steps</span><span class="p">:</span>
</span></span><span class="line"><span class="cl"><span class="w"></span>- <span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l">test</span>
</span></span><span class="line"><span class="cl"><span class="w"> </span><span class="nt">image</span><span class="p">:</span><span class="w"> </span><span class="l">golang:1.13</span>
</span></span><span class="line"><span class="cl"><span class="w"> </span><span class="nt">environment</span><span class="p">:</span>
</span></span><span class="line"><span class="cl"><span class="w"></span><span class="w"> </span><span class="nt">GOPROXY</span><span class="p">:</span><span class="w"> </span><span class="l">https://goproxy.cn</span>
</span></span><span class="line"><span class="cl"><span class="w"> </span><span class="nt">commands</span><span class="p">:</span>
</span></span><span class="line"><span class="cl"><span class="w"></span><span class="w"> </span>- <span class="l">go get -u</span>
</span></span><span class="line"><span class="cl"><span class="w"> </span>- <span class="l">go build -v</span>
</span></span><span class="line"><span class="cl"><span class="w"> </span>- <span class="l">go test -v -race -coverprofile=coverage.txt -covermode=atomic</span></span></span>
b=''
{space}
c=2
`), "{space}", " "),
want: lines(`
<span class="n">def</span><span class="p">:</span>\n
<span class="n">a</span><span class="o">=</span><span class="mi">1</span>\n
\n
<span class="n">b</span><span class="o">=</span><span class="sa"></span><span class="s1">&#39;</span><span class="s1">&#39;</span>\n
\n
<span class="n">c</span><span class="o">=</span><span class="mi">2</span>`,
),
},
}

for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
out, err := File(tt.name, "", []byte(tt.code))
assert.NoError(t, err)
expected := strings.Join(tt.want, "\n")
actual := strings.Join(out, "\n")
assert.Equal(t, strings.Count(actual, "<span"), strings.Count(actual, "</span>"))
assert.EqualValues(t, expected, actual)
})
}
}

func TestPlainText(t *testing.T) {
tests := []struct {
name string
code string
want []string
}{
{
name: "empty.py",
code: "",
want: lines(""),
},
{
name: "tags.py",
code: "<>",
want: lines("&lt;&gt;"),
},
{
name: "eol-no.py",
code: "a=1",
want: lines(`a=1`),
},
{
name: "eol-newline1.py",
code: "a=1\n",
want: lines(`a=1\n`),
},
{
name: "eol-newline2.py",
code: "a=1\n\n",
want: lines(`
a=1\n
\n
`),
},
{
name: ".drone.yml - trailing space",
numLines: 13,
fileName: ".drone.yml",
code: strings.Replace(util.Dedent(`
kind: pipeline
name: default
name: "empty-line-with-space.py",
code: strings.ReplaceAll(strings.TrimSpace(`
def:
a=1
steps:
- name: test
image: golang:1.13
environment:
GOPROXY: https://goproxy.cn
commands:
- go get -u
- go build -v
- go test -v -race -coverprofile=coverage.txt -covermode=atomic
`)+"\n", "name: default", "name: default ", 1),
want: util.Dedent(`
<span class="line"><span class="cl"><span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l">pipeline</span>
</span></span><span class="line"><span class="cl"><span class="w"></span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l">default </span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl"><span class="w"></span><span class="nt">steps</span><span class="p">:</span>
</span></span><span class="line"><span class="cl"><span class="w"></span>- <span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l">test</span>
</span></span><span class="line"><span class="cl"><span class="w"> </span><span class="nt">image</span><span class="p">:</span><span class="w"> </span><span class="l">golang:1.13</span>
</span></span><span class="line"><span class="cl"><span class="w"> </span><span class="nt">environment</span><span class="p">:</span>
</span></span><span class="line"><span class="cl"><span class="w"></span><span class="w"> </span><span class="nt">GOPROXY</span><span class="p">:</span><span class="w"> </span><span class="l">https://goproxy.cn</span>
</span></span><span class="line"><span class="cl"><span class="w"> </span><span class="nt">commands</span><span class="p">:</span>
</span></span><span class="line"><span class="cl"><span class="w"></span><span class="w"> </span>- <span class="l">go get -u</span>
</span></span><span class="line"><span class="cl"><span class="w"> </span>- <span class="l">go build -v</span>
</span></span><span class="line"><span class="cl"><span class="w"> </span>- <span class="l">go test -v -race -coverprofile=coverage.txt -covermode=atomic</span>
</span></span>
<span class="w">
</span>
`),
b=''
{space}
c=2
`), "{space}", " "),
want: lines(`
def:\n
a=1\n
\n
b=&#39;&#39;\n
\n
c=2`),
},
}

for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
got := strings.Join(File(tt.numLines, tt.fileName, "", []byte(tt.code)), "\n")
assert.Equal(t, tt.want, got)
out := PlainText([]byte(tt.code))
expected := strings.Join(tt.want, "\n")
actual := strings.Join(out, "\n")
assert.EqualValues(t, expected, actual)
})
}
}
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