138 lines
4.4 KiB
Go
138 lines
4.4 KiB
Go
// Copyright 2019 The Gitea Authors. All rights reserved.
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// Copyright 2024 The Forgejo Authors c/o Codeberg e.V.. All rights reserved.
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// SPDX-License-Identifier: MIT
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package callout
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import (
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"strings"
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"code.gitea.io/gitea/modules/svg"
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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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type GitHubCalloutTransformer struct{}
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// Transform transforms the given AST tree.
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func (g *GitHubCalloutTransformer) Transform(node *ast.Document, reader text.Reader, pc parser.Context) {
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supportedAttentionTypes := map[string]bool{
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"note": true,
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"tip": true,
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"important": true,
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"warning": true,
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"caution": true,
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}
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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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return ast.WalkContinue, nil
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}
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switch v := n.(type) {
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case *ast.Blockquote:
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// We only want attention blockquotes when the AST looks like:
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// Text: "["
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// Text: "!TYPE"
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// Text(SoftLineBreak): "]"
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// grab these nodes and make sure we adhere to the attention blockquote structure
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firstParagraph := v.FirstChild()
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if firstParagraph.ChildCount() < 3 {
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return ast.WalkContinue, nil
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}
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firstTextNode, ok := firstParagraph.FirstChild().(*ast.Text)
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if !ok || string(firstTextNode.Text(reader.Source())) != "[" {
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return ast.WalkContinue, nil
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}
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secondTextNode, ok := firstTextNode.NextSibling().(*ast.Text)
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if !ok {
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return ast.WalkContinue, nil
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}
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// If the second node's text isn't one of the supported attention
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// types, continue walking.
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secondTextNodeText := secondTextNode.Text(reader.Source())
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attentionType := strings.ToLower(strings.TrimPrefix(string(secondTextNodeText), "!"))
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if _, has := supportedAttentionTypes[attentionType]; !has {
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return ast.WalkContinue, nil
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}
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thirdTextNode, ok := secondTextNode.NextSibling().(*ast.Text)
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if !ok || string(thirdTextNode.Text(reader.Source())) != "]" {
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return ast.WalkContinue, nil
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}
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// color the blockquote
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v.SetAttributeString("class", []byte("attention-header attention-"+attentionType))
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// create an emphasis to make it bold
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attentionParagraph := ast.NewParagraph()
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emphasis := ast.NewEmphasis(2)
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emphasis.SetAttributeString("class", []byte("attention-"+attentionType))
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firstParagraph.InsertBefore(firstParagraph, firstTextNode, emphasis)
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// capitalize first letter
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attentionText := ast.NewString([]byte(strings.ToUpper(string(attentionType[0])) + attentionType[1:]))
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// replace the ![TYPE] with a dedicated paragraph of icon+Type
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emphasis.AppendChild(emphasis, attentionText)
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attentionParagraph.AppendChild(attentionParagraph, NewAttention(attentionType))
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attentionParagraph.AppendChild(attentionParagraph, emphasis)
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firstParagraph.Parent().InsertBefore(firstParagraph.Parent(), firstParagraph, attentionParagraph)
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firstParagraph.RemoveChild(firstParagraph, firstTextNode)
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firstParagraph.RemoveChild(firstParagraph, secondTextNode)
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firstParagraph.RemoveChild(firstParagraph, thirdTextNode)
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}
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return ast.WalkContinue, nil
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})
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}
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type GitHubCalloutHTMLRenderer struct {
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html.Config
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}
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// RegisterFuncs implements renderer.NodeRenderer.RegisterFuncs.
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func (r *GitHubCalloutHTMLRenderer) RegisterFuncs(reg renderer.NodeRendererFuncRegisterer) {
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reg.Register(KindAttention, r.renderAttention)
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}
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// renderAttention renders a quote marked with i.e. "> **Note**" or "> **Warning**" with a corresponding svg
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func (r *GitHubCalloutHTMLRenderer) renderAttention(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
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if entering {
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n := node.(*Attention)
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var octiconName string
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switch n.AttentionType {
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case "note":
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octiconName = "info"
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case "tip":
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octiconName = "light-bulb"
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case "important":
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octiconName = "report"
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case "warning":
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octiconName = "alert"
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case "caution":
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octiconName = "stop"
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default:
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octiconName = "info"
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}
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_, _ = w.WriteString(string(svg.RenderHTML("octicon-"+octiconName, 16, "attention-icon attention-"+n.AttentionType)))
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}
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return ast.WalkContinue, nil
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}
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func NewGitHubCalloutHTMLRenderer(opts ...html.Option) renderer.NodeRenderer {
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r := &GitHubCalloutHTMLRenderer{
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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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