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Add RTL rendering support to Markdown (#24816)
Support RTL content in Markdown: ![image](https://github.com/go-gitea/gitea/assets/115237/dedb1b0c-2f05-40dc-931a-0d9dc81f7c97) Example document: https://try.gitea.io/silverwind/symlink-test/src/branch/master/bidi-text.md Same on GitHub: https://github.com/silverwind/symlink-test/blob/master/bidi-text.md `dir=auto` enables a browser heuristic that sets the text direction automatically. It is the only way to get automatic text direction. Ref: https://codeberg.org/Codeberg/Community/issues/1021 --------- Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
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@ -630,7 +630,7 @@ func mentionProcessor(ctx *RenderContext, node *html.Node) {
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}
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}
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mentionedUsername := mention[1:]
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mentionedUsername := mention[1:]
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if processorHelper.IsUsernameMentionable != nil && processorHelper.IsUsernameMentionable(ctx.Ctx, mentionedUsername) {
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if DefaultProcessorHelper.IsUsernameMentionable != nil && DefaultProcessorHelper.IsUsernameMentionable(ctx.Ctx, mentionedUsername) {
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replaceContent(node, loc.Start, loc.End, createLink(util.URLJoin(setting.AppURL, mentionedUsername), mention, "mention"))
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replaceContent(node, loc.Start, loc.End, createLink(util.URLJoin(setting.AppURL, mentionedUsername), mention, "mention"))
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node = node.NextSibling.NextSibling
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node = node.NextSibling.NextSibling
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} else {
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} else {
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@ -47,6 +47,12 @@ func (g *ASTTransformer) Transform(node *ast.Document, reader text.Reader, pc pa
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tocMode = rc.TOC
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tocMode = rc.TOC
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}
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}
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applyElementDir := func(n ast.Node) {
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if markup.DefaultProcessorHelper.ElementDir != "" {
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n.SetAttributeString("dir", []byte(markup.DefaultProcessorHelper.ElementDir))
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}
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}
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attentionMarkedBlockquotes := make(container.Set[*ast.Blockquote])
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attentionMarkedBlockquotes := make(container.Set[*ast.Blockquote])
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_ = ast.Walk(node, func(n ast.Node, entering bool) (ast.WalkStatus, error) {
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_ = ast.Walk(node, func(n ast.Node, entering bool) (ast.WalkStatus, error) {
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if !entering {
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if !entering {
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@ -69,6 +75,9 @@ func (g *ASTTransformer) Transform(node *ast.Document, reader text.Reader, pc pa
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header.ID = util.BytesToReadOnlyString(id.([]byte))
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header.ID = util.BytesToReadOnlyString(id.([]byte))
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}
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}
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tocList = append(tocList, header)
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tocList = append(tocList, header)
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applyElementDir(v)
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case *ast.Paragraph:
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applyElementDir(v)
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case *ast.Image:
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case *ast.Image:
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// Images need two things:
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// Images need two things:
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//
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//
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@ -171,6 +180,7 @@ func (g *ASTTransformer) Transform(node *ast.Document, reader text.Reader, pc pa
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v.AppendChild(v, newChild)
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v.AppendChild(v, newChild)
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}
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}
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}
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}
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applyElementDir(v)
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case *ast.Text:
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case *ast.Text:
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if v.SoftLineBreak() && !v.HardLineBreak() {
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if v.SoftLineBreak() && !v.HardLineBreak() {
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renderMetas := pc.Get(renderMetasKey).(map[string]string)
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renderMetas := pc.Get(renderMetasKey).(map[string]string)
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@ -30,14 +30,16 @@ const (
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type ProcessorHelper struct {
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type ProcessorHelper struct {
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IsUsernameMentionable func(ctx context.Context, username string) bool
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IsUsernameMentionable func(ctx context.Context, username string) bool
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ElementDir string // the direction of the elements, eg: "ltr", "rtl", "auto", default to no direction attribute
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}
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}
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var processorHelper ProcessorHelper
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var DefaultProcessorHelper ProcessorHelper
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// Init initialize regexps for markdown parsing
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// Init initialize regexps for markdown parsing
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func Init(ph *ProcessorHelper) {
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func Init(ph *ProcessorHelper) {
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if ph != nil {
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if ph != nil {
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processorHelper = *ph
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DefaultProcessorHelper = *ph
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}
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}
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NewSanitizer()
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NewSanitizer()
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@ -13,6 +13,7 @@ import (
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func ProcessorHelper() *markup.ProcessorHelper {
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func ProcessorHelper() *markup.ProcessorHelper {
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return &markup.ProcessorHelper{
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return &markup.ProcessorHelper{
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ElementDir: "auto", // set dir="auto" for necessary (eg: <p>, <h?>, etc) tags
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IsUsernameMentionable: func(ctx context.Context, username string) bool {
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IsUsernameMentionable: func(ctx context.Context, username string) bool {
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mentionedUser, err := user.GetUserByName(ctx, username)
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mentionedUser, err := user.GetUserByName(ctx, username)
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if err != nil {
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if err != nil {
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@ -250,7 +250,7 @@ func TestGetUserRss(t *testing.T) {
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title, _ := rssDoc.ChildrenFiltered("title").Html()
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title, _ := rssDoc.ChildrenFiltered("title").Html()
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assert.EqualValues(t, "Feed of "the_1-user.with.all.allowedChars"", title)
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assert.EqualValues(t, "Feed of "the_1-user.with.all.allowedChars"", title)
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description, _ := rssDoc.ChildrenFiltered("description").Html()
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description, _ := rssDoc.ChildrenFiltered("description").Html()
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assert.EqualValues(t, "<p>some <a href="https://commonmark.org/" rel="nofollow">commonmark</a>!</p>\n", description)
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assert.EqualValues(t, "<p dir="auto">some <a href="https://commonmark.org/" rel="nofollow">commonmark</a>!</p>\n", description)
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}
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}
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}
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}
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@ -1091,6 +1091,7 @@ a.label,
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color: var(--color-text);
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color: var(--color-text);
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background: var(--color-box-body);
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background: var(--color-box-body);
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border-color: var(--color-secondary);
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border-color: var(--color-secondary);
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text-align: start; /* Override fomantic's `text-align: left` to make RTL work via HTML `dir="auto"` */
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}
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}
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.ui.table th,
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.ui.table th,
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@ -23,9 +23,9 @@
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}
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}
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.markup .anchor {
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.markup .anchor {
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float: left;
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padding-right: 4px;
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padding-right: 4px;
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margin-left: -20px;
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margin-left: -20px;
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line-height: 1;
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color: inherit;
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color: inherit;
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}
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}
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@ -37,6 +37,10 @@
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outline: none;
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outline: none;
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}
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}
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.markup h1 .anchor {
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margin-top: -2px; /* re-align to center */
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}
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.markup h1 .anchor .svg,
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.markup h1 .anchor .svg,
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.markup h2 .anchor .svg,
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.markup h2 .anchor .svg,
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.markup h3 .anchor .svg,
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.markup h3 .anchor .svg,
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