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