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Convert EOL to UNIX-style to render MD properly (#8925)
* Convert EOL to UNIX-style to render MD properly * Update modules/markup/markdown/markdown.go Co-Authored-By: zeripath <art27@cantab.net> * Fix lint optimization * Check for empty content before conversion * Update modules/util/util.go Co-Authored-By: zeripath <art27@cantab.net> * Improved checks and tests * Add paragraph render test * Improve speed even more, improve tests * Small improvement by @gary-kim * Fix test for DOS * More improvements * Restart CI
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cda8de2004
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@ -157,7 +157,8 @@ func RenderRaw(body []byte, urlPrefix string, wikiMarkdown bool) []byte {
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exts |= blackfriday.HardLineBreak
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}
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body = blackfriday.Run(body, blackfriday.WithRenderer(renderer), blackfriday.WithExtensions(exts))
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// Need to normalize EOL to UNIX LF to have consistent results in rendering
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body = blackfriday.Run(util.NormalizeEOL(body), blackfriday.WithRenderer(renderer), blackfriday.WithExtensions(exts))
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return markup.SanitizeBytes(body)
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}
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@ -294,3 +294,25 @@ func TestTotal_RenderString(t *testing.T) {
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assert.Equal(t, testCases[i+1], line)
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}
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}
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func TestRender_RenderParagraphs(t *testing.T) {
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test := func(t *testing.T, str string, cnt int) {
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unix := []byte(str)
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res := string(RenderRaw(unix, "", false))
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assert.Equal(t, strings.Count(res, "<p"), cnt)
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mac := []byte(strings.ReplaceAll(str, "\n", "\r"))
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res = string(RenderRaw(mac, "", false))
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assert.Equal(t, strings.Count(res, "<p"), cnt)
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dos := []byte(strings.ReplaceAll(str, "\n", "\r\n"))
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res = string(RenderRaw(dos, "", false))
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assert.Equal(t, strings.Count(res, "<p"), cnt)
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}
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test(t, "\nOne\nTwo\nThree", 1)
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test(t, "\n\nOne\nTwo\nThree", 1)
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test(t, "\n\nOne\nTwo\nThree\n\n\n", 1)
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test(t, "A\n\nB\nC\n", 2)
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test(t, "A\n\n\nB\nC\n", 2)
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}
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@ -5,6 +5,7 @@
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package util
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import (
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"bytes"
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"strings"
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)
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@ -63,3 +64,39 @@ func Min(a, b int) int {
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func IsEmptyString(s string) bool {
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return len(strings.TrimSpace(s)) == 0
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}
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// NormalizeEOL will convert Windows (CRLF) and Mac (CR) EOLs to UNIX (LF)
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func NormalizeEOL(input []byte) []byte {
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var right, left, pos int
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if right = bytes.IndexByte(input, '\r'); right == -1 {
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return input
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}
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length := len(input)
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tmp := make([]byte, length)
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// We know that left < length because otherwise right would be -1 from IndexByte.
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copy(tmp[pos:pos+right], input[left:left+right])
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pos += right
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tmp[pos] = '\n'
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left += right + 1
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pos++
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for left < length {
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if input[left] == '\n' {
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left++
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}
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right = bytes.IndexByte(input[left:], '\r')
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if right == -1 {
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copy(tmp[pos:], input[left:])
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pos += length - left
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break
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}
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copy(tmp[pos:pos+right], input[left:left+right])
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pos += right
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tmp[pos] = '\n'
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left += right + 1
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pos++
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}
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return tmp[:pos]
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}
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@ -5,6 +5,7 @@
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package util
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import (
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"strings"
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"testing"
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"code.gitea.io/gitea/modules/setting"
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@ -94,3 +95,61 @@ func TestIsEmptyString(t *testing.T) {
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assert.Equal(t, v.expected, IsEmptyString(v.s))
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}
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}
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func Test_NormalizeEOL(t *testing.T) {
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data1 := []string{
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"",
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"This text starts with empty lines",
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"another",
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"",
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"",
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"",
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"Some other empty lines in the middle",
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"more.",
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"And more.",
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"Ends with empty lines too.",
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"",
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"",
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"",
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}
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data2 := []string{
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"This text does not start with empty lines",
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"another",
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"",
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"",
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"",
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"Some other empty lines in the middle",
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"more.",
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"And more.",
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"Ends without EOLtoo.",
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}
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buildEOLData := func(data []string, eol string) []byte {
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return []byte(strings.Join(data, eol))
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}
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dos := buildEOLData(data1, "\r\n")
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unix := buildEOLData(data1, "\n")
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mac := buildEOLData(data1, "\r")
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assert.Equal(t, unix, NormalizeEOL(dos))
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assert.Equal(t, unix, NormalizeEOL(mac))
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assert.Equal(t, unix, NormalizeEOL(unix))
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dos = buildEOLData(data2, "\r\n")
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unix = buildEOLData(data2, "\n")
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mac = buildEOLData(data2, "\r")
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assert.Equal(t, unix, NormalizeEOL(dos))
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assert.Equal(t, unix, NormalizeEOL(mac))
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assert.Equal(t, unix, NormalizeEOL(unix))
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assert.Equal(t, []byte("one liner"), NormalizeEOL([]byte("one liner")))
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assert.Equal(t, []byte("\n"), NormalizeEOL([]byte("\n")))
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assert.Equal(t, []byte("\ntwo liner"), NormalizeEOL([]byte("\ntwo liner")))
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assert.Equal(t, []byte("two liner\n"), NormalizeEOL([]byte("two liner\n")))
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assert.Equal(t, []byte{}, NormalizeEOL([]byte{}))
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assert.Equal(t, []byte("mix\nand\nmatch\n."), NormalizeEOL([]byte("mix\r\nand\rmatch\n.")))
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}
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