patch of appview/pages: markup: add `@` user-mention parsing in markdown · round #6 · pull #736 · tangled.org/core

+7 -1

appview/pages/markup/markdown.go

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       	Files        fs.FS

     

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       }

     

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       -
       func (rctx *RenderContext) RenderMarkdown(source string) string {

     

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       	md := goldmark.New(

     

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       		goldmark.WithExtensions(

     

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       			extension.GFM,

     
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       			),

     

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       			treeblood.MathML(),

     

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       			callout.CalloutExtention,

     

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       		),

     

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       		goldmark.WithParserOptions(

     

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       			parser.WithAutoHeadingID(),

     

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       		),

     

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       		goldmark.WithRendererOptions(html.WithUnsafe()),

     

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       	)

     

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       	if rctx != nil {

     

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       		var transformers []util.PrioritizedValue

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       	Files        fs.FS

     

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       }

     

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       func NewMarkdown() goldmark.Markdown {

     

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       	md := goldmark.New(

     

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       		goldmark.WithExtensions(

     

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       			extension.GFM,

     
···

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       			),

     

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       			treeblood.MathML(),

     

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       			callout.CalloutExtention,

     

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       			AtExt,

     

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       		),

     

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       		goldmark.WithParserOptions(

     

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       			parser.WithAutoHeadingID(),

     

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       		),

     

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       		goldmark.WithRendererOptions(html.WithUnsafe()),

     

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       	)

     

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       	return md

     

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       }

     

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       func (rctx *RenderContext) RenderMarkdown(source string) string {

     

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       	md := NewMarkdown()

     

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       	if rctx != nil {

     

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       		var transformers []util.PrioritizedValue

+135

appview/pages/markup/markdown_at_extension.go

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       // heavily inspired by: https://github.com/kaleocheng/goldmark-extensions

     

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       package markup

     

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       import (

     

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       	"regexp"

     

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       	"github.com/yuin/goldmark"

     

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       	"github.com/yuin/goldmark/ast"

     

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       	"github.com/yuin/goldmark/parser"

     

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       	"github.com/yuin/goldmark/renderer"

     

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       	"github.com/yuin/goldmark/renderer/html"

     

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       	"github.com/yuin/goldmark/text"

     

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       	"github.com/yuin/goldmark/util"

     

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       )

     

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       // An AtNode struct represents an AtNode

     

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       type AtNode struct {

     

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       	handle string

     

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       	ast.BaseInline

     

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       }

     

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       var _ ast.Node = &AtNode{}

     

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       // Dump implements Node.Dump.

     

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       func (n *AtNode) Dump(source []byte, level int) {

     

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       	ast.DumpHelper(n, source, level, nil, nil)

     

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       }

     

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       // KindAt is a NodeKind of the At node.

     

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       var KindAt = ast.NewNodeKind("At")

     

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       // Kind implements Node.Kind.

     

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       func (n *AtNode) Kind() ast.NodeKind {

     

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       	return KindAt

     

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       }

     

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       var atRegexp = regexp.MustCompile(`(^|\s|\()(@)([a-zA-Z0-9.-]+)(\b)`)

     

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       type atParser struct{}

     

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       // NewAtParser return a new InlineParser that parses

     

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       // at expressions.

     

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       func NewAtParser() parser.InlineParser {

     

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       	return &atParser{}

     

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       }

     

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       func (s *atParser) Trigger() []byte {

     

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       	return []byte{'@'}

     

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       }

     

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       func (s *atParser) Parse(parent ast.Node, block text.Reader, pc parser.Context) ast.Node {

     

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       	line, segment := block.PeekLine()

     

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       	m := atRegexp.FindSubmatchIndex(line)

     

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       	if m == nil {

     

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       		return nil

     

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       	}

     

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       	atSegment := text.NewSegment(segment.Start, segment.Start+m[1])

     

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       	block.Advance(m[1])

     

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       	node := &AtNode{}

     

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       	node.AppendChild(node, ast.NewTextSegment(atSegment))

     

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       	node.handle = string(atSegment.Value(block.Source())[1:])

     

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       	return node

     

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       }

     

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       // atHtmlRenderer is a renderer.NodeRenderer implementation that

     

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       // renders At nodes.

     

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       type atHtmlRenderer struct {

     

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       	html.Config

     

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       }

     

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       // NewAtHTMLRenderer returns a new AtHTMLRenderer.

     

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       func NewAtHTMLRenderer(opts ...html.Option) renderer.NodeRenderer {

     

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       	r := &atHtmlRenderer{

     

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       		Config: html.NewConfig(),

     

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       	}

     

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       	for _, opt := range opts {

     

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       		opt.SetHTMLOption(&r.Config)

     

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       	}

     

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       	return r

     

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       }

     

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       // RegisterFuncs implements renderer.NodeRenderer.RegisterFuncs.

     

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       func (r *atHtmlRenderer) RegisterFuncs(reg renderer.NodeRendererFuncRegisterer) {

     

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       	reg.Register(KindAt, r.renderAt)

     

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       }

     

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       func (r *atHtmlRenderer) renderAt(w util.BufWriter, source []byte, n ast.Node, entering bool) (ast.WalkStatus, error) {

     

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       	if entering {

     

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       		w.WriteString(`<a href="/@`)

     

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       		w.WriteString(n.(*AtNode).handle)

     

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       		w.WriteString(`" class="mention">`)

     

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       	} else {

     

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       		w.WriteString("</a>")

     

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       	}

     

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       	return ast.WalkContinue, nil

     

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       }

     

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       type atExt struct{}

     

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       // At is an extension that allow you to use at expression like '@user.bsky.social' .

     

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       var AtExt = &atExt{}

     

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       func (e *atExt) Extend(m goldmark.Markdown) {

     

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       	m.Parser().AddOptions(parser.WithInlineParsers(

     

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       		util.Prioritized(NewAtParser(), 500),

     

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       	))

     

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       	m.Renderer().AddOptions(renderer.WithNodeRenderers(

     

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       		util.Prioritized(NewAtHTMLRenderer(), 500),

     

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       	))

     

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       }

     

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       // FindUserMentions returns Set of user handles from given markup soruce.

     

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       // It doesn't guarntee unique DIDs

     

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       func FindUserMentions(source string) []string {

     

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       	var (

     

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       		mentions    []string

     

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       		mentionsSet = make(map[string]struct{})

     

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       		md          = NewMarkdown()

     

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       		sourceBytes = []byte(source)

     

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       		root        = md.Parser().Parse(text.NewReader(sourceBytes))

     

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       	)

     

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       	ast.Walk(root, func(n ast.Node, entering bool) (ast.WalkStatus, error) {

     

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       		if entering && n.Kind() == KindAt {

     

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       			handle := n.(*AtNode).handle

     

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       			mentionsSet[handle] = struct{}{}

     

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       			return ast.WalkSkipChildren, nil

     

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       		}

     

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       		return ast.WalkContinue, nil

     

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       	})

     

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       	for handle := range mentionsSet {

     

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       		mentions = append(mentions, handle)

     

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       	}

     

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       	return mentions

     

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       }

appview/pages/markup/sanitizer.go

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       	policy.AllowAttrs("class").Matching(regexp.MustCompile(`heading`)).OnElements("h1", "h2", "h3", "h4", "h5", "h6", "h7", "h8")

     

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       	policy.AllowAttrs("class").Matching(regexp.MustCompile(strings.Join(slices.Collect(maps.Values(chroma.StandardTypes)), "|"))).OnElements("span")

     

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       	// centering content

     

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       	policy.AllowElements("center")

     

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···

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       	policy.AllowAttrs("class").Matching(regexp.MustCompile(`heading`)).OnElements("h1", "h2", "h3", "h4", "h5", "h6", "h7", "h8")

     

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       	policy.AllowAttrs("class").Matching(regexp.MustCompile(strings.Join(slices.Collect(maps.Values(chroma.StandardTypes)), "|"))).OnElements("span")

     

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       	// at-mentions

     

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       	policy.AllowAttrs("class").Matching(regexp.MustCompile(`mention`)).OnElements("a")

     

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       	// centering content

     

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       	policy.AllowElements("center")

     

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input.css

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                   @apply no-underline;

     

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               }

     

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               .prose li {

     

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                   @apply my-0 py-0;

     

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               }

···

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                   @apply no-underline;

     

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               }

     

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               .prose a.mention {

     

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                   @apply no-underline hover:underline;

     

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               }

     

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               .prose li {

     

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                   @apply my-0 py-0;

     

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               }