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// Package goldmark implements functions to convert markdown text to a desired format.
package goldmark
import (
"io"
"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"
)
// DefaultParser returns a new Parser that is configured by default values.
func DefaultParser() parser.Parser {
return parser.NewParser(parser.WithBlockParsers(parser.DefaultBlockParsers()...),
parser.WithInlineParsers(parser.DefaultInlineParsers()...),
parser.WithParagraphTransformers(parser.DefaultParagraphTransformers()...),
)
}
// DefaultRenderer returns a new Renderer that is configured by default values.
func DefaultRenderer() renderer.Renderer {
return renderer.NewRenderer(renderer.WithNodeRenderers(util.Prioritized(html.NewRenderer(), 1000)))
}
var defaultMarkdown = New()
// Convert interprets a UTF-8 bytes source in Markdown and
// write rendered contents to a writer w.
func Convert(source []byte, w io.Writer, opts ...parser.ParseOption) error {
return defaultMarkdown.Convert(source, w, opts...)
}
// A Markdown interface offers functions to convert Markdown text to
// a desired format.
type Markdown interface {
// Convert interprets a UTF-8 bytes source in Markdown and write rendered
// contents to a writer w.
Convert(source []byte, writer io.Writer, opts ...parser.ParseOption) error
// Parser returns a Parser that will be used for conversion.
Parser() parser.Parser
// SetParser sets a Parser to this object.
SetParser(parser.Parser)
// Parser returns a Renderer that will be used for conversion.
Renderer() renderer.Renderer
// SetRenderer sets a Renderer to this object.
SetRenderer(renderer.Renderer)
}
// Option is a functional option type for Markdown objects.
type Option func(*markdown)
// WithExtensions adds extensions.
func WithExtensions(ext ...Extender) Option {
return func(m *markdown) {
m.extensions = append(m.extensions, ext...)
}
}
// WithParser allows you to override the default parser.
func WithParser(p parser.Parser) Option {
return func(m *markdown) {
m.parser = p
}
}
// WithParserOptions applies options for the parser.
func WithParserOptions(opts ...parser.Option) Option {
return func(m *markdown) {
m.parser.AddOptions(opts...)
}
}
// WithRenderer allows you to override the default renderer.
func WithRenderer(r renderer.Renderer) Option {
return func(m *markdown) {
m.renderer = r
}
}
// WithRendererOptions applies options for the renderer.
func WithRendererOptions(opts ...renderer.Option) Option {
return func(m *markdown) {
m.renderer.AddOptions(opts...)
}
}
type markdown struct {
parser parser.Parser
renderer renderer.Renderer
extensions []Extender
}
// New returns a new Markdown with given options.
func New(options ...Option) Markdown {
md := &markdown{
parser: DefaultParser(),
renderer: DefaultRenderer(),
extensions: []Extender{},
}
for _, opt := range options {
opt(md)
}
for _, e := range md.extensions {
e.Extend(md)
}
return md
}
func (m *markdown) Convert(source []byte, writer io.Writer, opts ...parser.ParseOption) error {
reader := text.NewReader(source)
doc := m.parser.Parse(reader, opts...)
return m.renderer.Render(writer, source, doc)
}
func (m *markdown) Parser() parser.Parser {
return m.parser
}
func (m *markdown) SetParser(v parser.Parser) {
m.parser = v
}
func (m *markdown) Renderer() renderer.Renderer {
return m.renderer
}
func (m *markdown) SetRenderer(v renderer.Renderer) {
m.renderer = v
}
// An Extender interface is used for extending Markdown.
type Extender interface {
// Extend extends the Markdown.
Extend(Markdown)
}
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