Source: goldmark.go in package golang.org/x/pkgsite/internal/postgres


package postgres

import (
	"github.com/yuin/goldmark/ast"
	"github.com/yuin/goldmark/parser"
	"github.com/yuin/goldmark/renderer"
	"github.com/yuin/goldmark/renderer/html"
	"github.com/yuin/goldmark/text"
	"github.com/yuin/goldmark/util"
)

ASTTransformer is a default transformer of the goldmark tree.

type ASTTransformer struct{}

HTMLRenderer is a renderer.NodeRenderer implementation that renders pkg.go.dev readme features.

type HTMLRenderer struct {
	html.Config
}

Transform transforms the given AST tree to remove an unnecessary child node from the image node. This is so that the summary generated doesn't the text content of an image block.

func (g *ASTTransformer) Transform(node *ast.Document, reader text.Reader, pc parser.Context) {
	_ = ast.Walk(node, func(n ast.Node, entering bool) (ast.WalkStatus, error) {
		if !entering {
			return ast.WalkContinue, nil
		}
		switch v := n.(type) {

remove KindText childnode from image

			v.RemoveChild(v, v.FirstChild())
		}
		return ast.WalkContinue, nil
	})
}

NewHTMLRenderer creates a new HTMLRenderer for a readme.

func NewHTMLRenderer(opts ...html.Option) renderer.NodeRenderer {
	r := &HTMLRenderer{
		Config: html.NewConfig(),
	}
	for _, opt := range opts {
		opt.SetHTMLOption(&r.Config)
	}
	return r
}

RegisterFuncs implements renderer.NodeRenderer.RegisterFuncs.

skip rendering for everything except for KindText

	for _, kind := range []ast.NodeKind{
		ast.KindAutoLink, ast.KindBlockquote, ast.KindCodeBlock, ast.KindCodeSpan,
		ast.KindDocument, ast.KindEmphasis, ast.KindFencedCodeBlock, ast.KindHTMLBlock,
		ast.KindHeading, ast.KindLink, ast.KindList, ast.KindListItem,
		ast.KindParagraph, ast.KindRawHTML, ast.KindString, ast.KindTextBlock,
		ast.KindThematicBreak,
	} {
		reg.Register(kind, r.skipNode)
	}
	reg.Register(ast.KindImage, r.skipImage)
}

func (r *HTMLRenderer) skipImage(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
	if !entering {
		w.WriteString(" ")
	}
	return ast.WalkContinue, nil
}

func (r *HTMLRenderer) skipNode(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
	return ast.WalkContinue, nil